Remove ucloud_common and put its files under ucloud.common subpackage.

Remove individual config.py used by every component and put them into single config.py ucloud/config.py
Use /etc/ucloud/ucloud.conf for Environment Variables
Refactoring and a lot of it
Make ucloud repo a package and different components of ucloud a subpackage for avoiding code duplication.
Improved logging.

.gitignore

@@ -1,8 +1,7 @@
 .idea
 .vscode
-.env
 
 __pycache__
 
 docs/build
-*/log.txt
+logs.txt

Pipfile

@@ -5,6 +5,7 @@ verify_ssl = true
 
 [dev-packages]
 prospector = {extras = ["with_everything"],version = "*"}
+pylama = "*"
 
 [packages]
 python-decouple = "*"
@@ -12,7 +13,6 @@ requests = "*"
 flask = "*"
 flask-restful = "*"
 bitmath = "*"
-ucloud-common = {editable = true,git = "git+https://code.ungleich.ch/ucloud/ucloud_common.git",ref = "wip"}
 etcd3-wrapper = {editable = true,git = "git+https://code.ungleich.ch/ungleich-public/etcd3_wrapper.git",ref = "wip"}
 python-etcd3 = {editable = true,git = "git+https://github.com/kragniz/python-etcd3.git"}
 pyotp = "*"

Pipfile.lock

@@ -1,7 +1,7 @@
 {
     "_meta": {
         "hash": {
-            "sha256": "5e4aa65086afdf9ac2f1479e9e35684f767dfbbd13877c4e4a23dd471aef6c13"
+            "sha256": "f43a93c020eb20212b437fcc62882db03bfa93f4678eb930e31343d687c805ed"
         },
         "pipfile-spec": 6,
         "requires": {
@@ -379,10 +379,10 @@
         },
         "pynetbox": {
             "hashes": [
-                "sha256:e171380b36bedb7e0cd6a735fe8193d5809b373897b6905a2de43342761426c7"
+                "sha256:09525a29f1ac8c1a54772d6e2b94a55b1db6ba6a1c5b07f7af6a6ce232b1f7d5"
             ],
             "index": "pypi",
-            "version": "==4.0.8"
+            "version": "==4.1.0"
         },
         "pyotp": {
             "hashes": [
@@ -401,10 +401,10 @@
         },
         "python-decouple": {
             "hashes": [
-                "sha256:1317df14b43efee4337a4aa02914bf004f010cd56d6c4bd894e6474ec8c4fe2d"
+                "sha256:55c546b85b0c47a15a47a4312d451a437f7344a9be3e001660bccd93b637de95"
             ],
             "index": "pypi",
-            "version": "==3.1"
+            "version": "==3.3"
         },
         "python-etcd3": {
             "editable": true,
@@ -522,11 +522,6 @@
             ],
             "version": "==6.0.0"
         },
-        "ucloud-common": {
-            "editable": true,
-            "git": "https://code.ungleich.ch/ucloud/ucloud_common.git",
-            "ref": "eba92e5d6723093a3cc2999ae1f5c284e65dc809"
-        },
         "urllib3": {
             "hashes": [
                 "sha256:a8a318824cc77d1fd4b2bec2ded92646630d7fe8619497b142c84a9e6f5a7293",
@@ -775,6 +770,14 @@
             ],
             "version": "==2.4.2"
         },
+        "pylama": {
+            "hashes": [
+                "sha256:9bae53ef9c1a431371d6a8dca406816a60d547147b60a4934721898f553b7d8f",
+                "sha256:fd61c11872d6256b019ef1235be37b77c922ef37ac9797df6bd489996dddeb15"
+            ],
+            "index": "pypi",
+            "version": "==7.7.1"
+        },
         "pylint": {
             "hashes": [
                 "sha256:5d77031694a5fb97ea95e828c8d10fc770a1df6eb3906067aaed42201a8a6a09",

api/__init__.py

@@ -0,0 +1,3 @@
+import logging
+
+logger = logging.getLogger(__name__)

api/common_fields.py

@@ -1,7 +1,6 @@
 import os
 
-from config import etcd_client as client
+from config import etcd_client, env_vars
-from config import VM_PREFIX
 
 
 class Optional:
@@ -49,6 +48,6 @@ class VmUUIDField(Field):
         self.validation = self.vm_uuid_validation
 
     def vm_uuid_validation(self):
-        r = client.get(os.path.join(VM_PREFIX, self.uuid))
+        r = etcd_client.get(os.path.join(env_vars.get('VM_PREFIX'), self.uuid))
         if not r:
             self.add_error("VM with uuid {} does not exists".format(self.uuid))

api/config.py

@@ -1,33 +0,0 @@
-import logging
-
-from etcd3_wrapper import Etcd3Wrapper
-from decouple import config
-
-
-from ucloud_common.vm import VmPool
-from ucloud_common.host import HostPool
-from ucloud_common.request import RequestPool
-
-logging.basicConfig(
-    level=logging.DEBUG,
-    filename="log.txt",
-    filemode="a",
-    format="%(asctime)s: %(levelname)s - %(message)s",
-    datefmt="%d-%b-%y %H:%M:%S",
-)
-
-
-WITHOUT_CEPH = config("WITHOUT_CEPH", False, cast=bool)
-VM_PREFIX = config("VM_PREFIX")
-HOST_PREFIX = config("HOST_PREFIX")
-REQUEST_PREFIX = config("REQUEST_PREFIX")
-FILE_PREFIX = config("FILE_PREFIX")
-IMAGE_PREFIX = config("IMAGE_PREFIX")
-IMAGE_STORE_PREFIX = config("IMAGE_STORE_PREFIX")
-NETWORK_PREFIX = config("NETWORK_PREFIX")
-
-etcd_client = Etcd3Wrapper(host=config("ETCD_URL"))
-
-VM_POOL = VmPool(etcd_client, VM_PREFIX)
-HOST_POOL = HostPool(etcd_client, HOST_PREFIX)
-REQUEST_POOL = RequestPool(etcd_client, REQUEST_PREFIX)

api/create_image_store.py

@@ -1,10 +1,8 @@
 import json
 import os
-
 from uuid import uuid4
 
-from config import etcd_client as client
+from config import etcd_client, env_vars
-from config import IMAGE_STORE_PREFIX
 
 data = {
     "is_public": True,
@@ -14,4 +12,4 @@ data = {
     "attributes": {"list": [], "key": [], "pool": "images"},
 }
 
-client.put(os.path.join(IMAGE_STORE_PREFIX, uuid4().hex), json.dumps(data))
+etcd_client.put(os.path.join(env_vars.get('IMAGE_STORE_PREFIX'), uuid4().hex), json.dumps(data))

api/helper.py

@@ -1,20 +1,20 @@
 import binascii
-import requests
+import ipaddress
 import random
 import subprocess as sp
-import ipaddress
 
-from decouple import config
+import requests
 from pyotp import TOTP
-from config import VM_POOL, etcd_client, IMAGE_PREFIX
+
+from config import vm_pool, env_vars
 
 
 def check_otp(name, realm, token):
     try:
         data = {
-            "auth_name": config("AUTH_NAME", ""),
+            "auth_name": env_vars.get("AUTH_NAME"),
-            "auth_token": TOTP(config("AUTH_SEED", "")).now(),
+            "auth_token": TOTP(env_vars.get("AUTH_SEED")).now(),
-            "auth_realm": config("AUTH_REALM", ""),
+            "auth_realm": env_vars.get("AUTH_REALM"),
             "name": name,
             "realm": realm,
             "token": token,
@@ -24,8 +24,8 @@ def check_otp(name, realm, token):
 
     response = requests.get(
         "{OTP_SERVER}{OTP_VERIFY_ENDPOINT}".format(
-            OTP_SERVER=config("OTP_SERVER", ""),
+            OTP_SERVER=env_vars.get("OTP_SERVER", ""),
-            OTP_VERIFY_ENDPOINT=config("OTP_VERIFY_ENDPOINT", "verify"),
+            OTP_VERIFY_ENDPOINT=env_vars.get("OTP_VERIFY_ENDPOINT", "verify"),
         ),
         json=data,
     )
@@ -41,7 +41,7 @@ def resolve_vm_name(name, owner):
     result = next(
         filter(
             lambda vm: vm.value["owner"] == owner and vm.value["name"] == name,
-            VM_POOL.vms,
+            vm_pool.vms,
         ),
         None,
     )
@@ -79,7 +79,7 @@ def resolve_image_name(name, etcd_client):
     except Exception:
         raise ValueError("Image name not in correct format i.e {store_name}:{image_name}")
 
-    images = etcd_client.get_prefix(IMAGE_PREFIX, value_in_json=True)
+    images = etcd_client.get_prefix(env_vars.get('IMAGE_PREFIX'), value_in_json=True)
 
     # Try to find image with name == image_name and store_name == store_name
     try:
@@ -145,25 +145,6 @@ def get_ip_addr(mac_address, device):
         return result
 
 
-def increment_etcd_counter(etcd_client, key):
-    kv = etcd_client.get(key)
-    
-    if kv:
-        counter = int(kv.value)
-        counter = counter + 1
-    else:
-        counter = 1
-    
-    etcd_client.put(key, str(counter))
-    return counter
-
-
-def get_etcd_counter(etcd_client, key):
-    kv = etcd_client.get(key)
-    if kv:
-        return int(kv.value)
-    return None
-
 def mac2ipv6(mac, prefix):
     # only accept MACs separated by a colon
     parts = mac.split(":")

api/main.py

@@ -1,35 +1,19 @@
 import json
-import subprocess
 import os
-import pynetbox
+import subprocess
-import decouple
-
-import schemas
-
 from uuid import uuid4
 
+import pynetbox
 from flask import Flask, request
 from flask_restful import Resource, Api
 
-from ucloud_common.vm import VMStatus
+from common import counters
-from ucloud_common.request import RequestEntry, RequestType
+from common.request import RequestEntry, RequestType
-
+from common.vm import VMStatus
-from helper import (generate_mac, get_ip_addr, get_etcd_counter,
+from config import (etcd_client, request_pool, vm_pool, host_pool, env_vars)
-                    increment_etcd_counter, mac2ipv6)
+from . import schemas
-
+from .helper import generate_mac, mac2ipv6
-from config import (
+from api import logger
-    etcd_client,
-    WITHOUT_CEPH,
-    VM_PREFIX,
-    HOST_PREFIX,
-    FILE_PREFIX,
-    IMAGE_PREFIX,
-    NETWORK_PREFIX,
-    logging,
-    REQUEST_POOL,
-    VM_POOL,
-    HOST_POOL,
-)
 
 app = Flask(__name__)
 api = Api(app)
@@ -42,12 +26,12 @@ class CreateVM(Resource):
         validator = schemas.CreateVMSchema(data)
         if validator.is_valid():
             vm_uuid = uuid4().hex
-            vm_key = os.path.join(VM_PREFIX, vm_uuid)
+            vm_key = os.path.join(env_vars.get("VM_PREFIX"), vm_uuid)
             specs = {
-                'cpu': validator.specs['cpu'],
+                "cpu": validator.specs["cpu"],
-                'ram': validator.specs['ram'],
+                "ram": validator.specs["ram"],
-                'os-ssd': validator.specs['os-ssd'],
+                "os-ssd": validator.specs["os-ssd"],
-                'hdd': validator.specs['hdd']
+                "hdd": validator.specs["hdd"],
             }
             macs = [generate_mac() for i in range(len(data["network"]))]
             vm_entry = {
@@ -61,15 +45,16 @@ class CreateVM(Resource):
                 "log": [],
                 "vnc_socket": "",
                 "network": list(zip(data["network"], macs)),
-                "metadata": {
+                "metadata": {"ssh-keys": []},
-                    "ssh-keys": []
-                },
             }
             etcd_client.put(vm_key, vm_entry, value_in_json=True)
 
             # Create ScheduleVM Request
-            r = RequestEntry.from_scratch(type=RequestType.ScheduleVM, uuid=vm_uuid)
+            r = RequestEntry.from_scratch(
-            REQUEST_POOL.put(r)
+                type=RequestType.ScheduleVM, uuid=vm_uuid,
+                request_prefix=env_vars.get("REQUEST_PREFIX")
+            )
+            request_pool.put(r)
 
             return {"message": "VM Creation Queued"}, 200
         return validator.get_errors(), 400
@@ -81,13 +66,21 @@ class VmStatus(Resource):
         data = request.json
         validator = schemas.VMStatusSchema(data)
         if validator.is_valid():
-            vm = VM_POOL.get(os.path.join(VM_PREFIX, data["uuid"]))
+            vm = vm_pool.get(
+                os.path.join(env_vars.get("VM_PREFIX"), data["uuid"])
+            )
             vm_value = vm.value.copy()
             vm_value["ip"] = []
             for network_and_mac in vm.network:
                 network_name, mac = network_and_mac
-                network = etcd_client.get(os.path.join(NETWORK_PREFIX, data["name"], network_name),
+                network = etcd_client.get(
-                                          value_in_json=True)
+                    os.path.join(
+                        env_vars.get("NETWORK_PREFIX"),
+                        data["name"],
+                        network_name,
+                    ),
+                    value_in_json=True,
+                )
                 ipv6_addr = network.value.get("ipv6").split("::")[0] + "::"
                 vm_value["ip"].append(mac2ipv6(mac, ipv6_addr))
             vm.value = vm_value
@@ -102,7 +95,9 @@ class CreateImage(Resource):
         data = request.json
         validator = schemas.CreateImageSchema(data)
         if validator.is_valid():
-            file_entry = etcd_client.get(os.path.join(FILE_PREFIX, data["uuid"]))
+            file_entry = etcd_client.get(
+                os.path.join(env_vars.get("FILE_PREFIX"), data["uuid"])
+            )
             file_entry_value = json.loads(file_entry.value)
 
             image_entry_json = {
@@ -114,7 +109,8 @@ class CreateImage(Resource):
                 "visibility": "public",
             }
             etcd_client.put(
-                os.path.join(IMAGE_PREFIX, data["uuid"]), json.dumps(image_entry_json)
+                os.path.join(env_vars.get("IMAGE_PREFIX"), data["uuid"]),
+                json.dumps(image_entry_json),
             )
 
             return {"message": "Image queued for creation."}
@@ -124,15 +120,18 @@ class CreateImage(Resource):
 class ListPublicImages(Resource):
     @staticmethod
     def get():
-        images = etcd_client.get_prefix(IMAGE_PREFIX, value_in_json=True)
+        images = etcd_client.get_prefix(
+            env_vars.get("IMAGE_PREFIX"), value_in_json=True
+        )
         r = {}
         r["images"] = []
         for image in images:
-            image_key = "{}:{}".format(image.value["store_name"], image.value["name"])
+            image_key = "{}:{}".format(
-            r["images"].append({
+                image.value["store_name"], image.value["name"]
-                "name":image_key,
+            )
-                "status": image.value["status"]
+            r["images"].append(
-            })
+                {"name": image_key, "status": image.value["status"]}
+            )
         return r, 200
 
 
@@ -143,34 +142,47 @@ class VMAction(Resource):
         validator = schemas.VmActionSchema(data)
 
         if validator.is_valid():
-            vm_entry = VM_POOL.get(os.path.join(VM_PREFIX, data["uuid"]))
+            vm_entry = vm_pool.get(
+                os.path.join(env_vars.get("VM_PREFIX"), data["uuid"])
+            )
             action = data["action"]
 
             if action == "start":
                 vm_entry.status = VMStatus.requested_start
-                VM_POOL.put(vm_entry)
+                vm_pool.put(vm_entry)
                 action = "schedule"
 
             if action == "delete" and vm_entry.hostname == "":
                 try:
-                    path_without_protocol = vm_entry.path[vm_entry.path.find(":") + 1 :]
+                    path_without_protocol = vm_entry.path[
+                                            vm_entry.path.find(":") + 1:
+                                            ]
 
-                    if WITHOUT_CEPH:
+                    if env_vars.get("WITHOUT_CEPH"):
                         command_to_delete = [
-                            "rm", "-rf",
+                            "rm",
+                            "-rf",
                             os.path.join("/var/vm", vm_entry.uuid),
                         ]
                     else:
-                        command_to_delete = ["rbd", "rm", path_without_protocol]
+                        command_to_delete = [
+                            "rbd",
+                            "rm",
+                            path_without_protocol,
+                        ]
 
-                    subprocess.check_output(command_to_delete, stderr=subprocess.PIPE)
+                    subprocess.check_output(
+                        command_to_delete, stderr=subprocess.PIPE
+                    )
                 except subprocess.CalledProcessError as e:
                     if "No such file" in e.stderr.decode("utf-8"):
                         etcd_client.client.delete(vm_entry.key)
                         return {"message": "VM successfully deleted"}
                     else:
-                        logging.exception(e)
+                        logger.exception(e)
-                        return {"message": "Some error occurred while deleting VM"}
+                        return {
+                            "message": "Some error occurred while deleting VM"
+                        }
                 else:
                     etcd_client.client.delete(vm_entry.key)
                     return {"message": "VM successfully deleted"}
@@ -179,8 +191,9 @@ class VMAction(Resource):
                 type="{}VM".format(action.title()),
                 uuid=data["uuid"],
                 hostname=vm_entry.hostname,
+                request_prefix=env_vars.get("REQUEST_PREFIX")
             )
-            REQUEST_POOL.put(r)
+            request_pool.put(r)
             return {"message": "VM {} Queued".format(action.title())}, 200
         else:
             return validator.get_errors(), 400
@@ -193,15 +206,18 @@ class VMMigration(Resource):
         validator = schemas.VmMigrationSchema(data)
 
         if validator.is_valid():
-            vm = VM_POOL.get(data["uuid"])
+            vm = vm_pool.get(data["uuid"])
 
             r = RequestEntry.from_scratch(
                 type=RequestType.ScheduleVM,
                 uuid=vm.uuid,
-                destination=os.path.join(HOST_PREFIX, data["destination"]),
+                destination=os.path.join(
+                    env_vars.get("HOST_PREFIX"), data["destination"]
+                ),
                 migration=True,
+                request_prefix=env_vars.get("REQUEST_PREFIX")
             )
-            REQUEST_POOL.put(r)
+            request_pool.put(r)
             return {"message": "VM Migration Initialization Queued"}, 200
         else:
             return validator.get_errors(), 400
@@ -214,7 +230,9 @@ class ListUserVM(Resource):
         validator = schemas.OTPSchema(data)
 
         if validator.is_valid():
-            vms = etcd_client.get_prefix(VM_PREFIX, value_in_json=True)
+            vms = etcd_client.get_prefix(
+                env_vars.get("VM_PREFIX"), value_in_json=True
+            )
             return_vms = []
             user_vms = filter(lambda v: v.value["owner"] == data["name"], vms)
             for vm in user_vms:
@@ -246,9 +264,13 @@ class ListUserFiles(Resource):
         validator = schemas.OTPSchema(data)
 
         if validator.is_valid():
-            files = etcd_client.get_prefix(FILE_PREFIX, value_in_json=True)
+            files = etcd_client.get_prefix(
+                env_vars.get("FILE_PREFIX"), value_in_json=True
+            )
             return_files = []
-            user_files = list(filter(lambda f: f.value["owner"] == data["name"], files))
+            user_files = list(
+                filter(lambda f: f.value["owner"] == data["name"], files)
+            )
             for file in user_files:
                 return_files.append(
                     {
@@ -267,7 +289,7 @@ class CreateHost(Resource):
         data = request.json
         validator = schemas.CreateHostSchema(data)
         if validator.is_valid():
-            host_key = os.path.join(HOST_PREFIX, uuid4().hex)
+            host_key = os.path.join(env_vars.get("HOST_PREFIX"), uuid4().hex)
             host_entry = {
                 "specs": data["specs"],
                 "hostname": data["hostname"],
@@ -284,7 +306,7 @@ class CreateHost(Resource):
 class ListHost(Resource):
     @staticmethod
     def get():
-        hosts = HOST_POOL.hosts
+        hosts = host_pool.hosts
         r = {
             host.key: {
                 "status": host.status,
@@ -305,21 +327,38 @@ class GetSSHKeys(Resource):
             if not validator.key_name.value:
 
                 # {user_prefix}/{realm}/{name}/key/
-                etcd_key = os.path.join(decouple.config("USER_PREFIX"), data["realm"],
+                etcd_key = os.path.join(
-                                        data["name"], "key")
+                    env_vars.get('USER_PREFIX'),
-                etcd_entry = etcd_client.get_prefix(etcd_key, value_in_json=True)
+                    data["realm"],
+                    data["name"],
+                    "key",
+                )
+                etcd_entry = etcd_client.get_prefix(
+                    etcd_key, value_in_json=True
+                )
 
-                keys = {key.key.split("/")[-1]: key.value for key in etcd_entry}
+                keys = {
+                    key.key.split("/")[-1]: key.value for key in etcd_entry
+                }
                 return {"keys": keys}
             else:
 
                 # {user_prefix}/{realm}/{name}/key/{key_name}
-                etcd_key = os.path.join(decouple.config("USER_PREFIX"), data["realm"],
+                etcd_key = os.path.join(
-                                        data["name"], "key", data["key_name"])
+                    env_vars.get('USER_PREFIX'),
+                    data["realm"],
+                    data["name"],
+                    "key",
+                    data["key_name"],
+                )
                 etcd_entry = etcd_client.get(etcd_key, value_in_json=True)
 
                 if etcd_entry:
-                    return {"keys": {etcd_entry.key.split("/")[-1]: etcd_entry.value}}
+                    return {
+                        "keys": {
+                            etcd_entry.key.split("/")[-1]: etcd_entry.value
+                        }
+                    }
                 else:
                     return {"keys": {}}
         else:
@@ -334,11 +373,20 @@ class AddSSHKey(Resource):
         if validator.is_valid():
 
             # {user_prefix}/{realm}/{name}/key/{key_name}
-            etcd_key = os.path.join(USER_PREFIX, data["realm"], data["name"],
+            etcd_key = os.path.join(
-                                    "key", data["key_name"])
+                env_vars.get("USER_PREFIX"),
+                data["realm"],
+                data["name"],
+                "key",
+                data["key_name"],
+            )
             etcd_entry = etcd_client.get(etcd_key, value_in_json=True)
             if etcd_entry:
-                return {"message": "Key with name '{}' already exists".format(data["key_name"])}
+                return {
+                    "message": "Key with name '{}' already exists".format(
+                        data["key_name"]
+                    )
+                }
             else:
                 # Key Not Found. It implies user' haven't added any key yet.
                 etcd_client.put(etcd_key, data["key"], value_in_json=True)
@@ -355,14 +403,23 @@ class RemoveSSHKey(Resource):
         if validator.is_valid():
 
             # {user_prefix}/{realm}/{name}/key/{key_name}
-            etcd_key = os.path.join(USER_PREFIX, data["realm"], data["name"],
+            etcd_key = os.path.join(
-                                    "key", data["key_name"])
+                env_vars.get("USER_PREFIX"),
+                data["realm"],
+                data["name"],
+                "key",
+                data["key_name"],
+            )
             etcd_entry = etcd_client.get(etcd_key, value_in_json=True)
             if etcd_entry:
                 etcd_client.client.delete(etcd_key)
                 return {"message": "Key successfully removed."}
             else:
-                return {"message": "No Key with name '{}' Exists at all.".format(data["key_name"])}
+                return {
+                    "message": "No Key with name '{}' Exists at all.".format(
+                        data["key_name"]
+                    )
+                }
         else:
             return validator.get_errors(), 400
 
@@ -376,27 +433,40 @@ class CreateNetwork(Resource):
         if validator.is_valid():
 
             network_entry = {
-                "id": increment_etcd_counter(etcd_client, "/v1/counter/vxlan"),
+                "id": counters.increment_etcd_counter(
+                    etcd_client, "/v1/counter/vxlan"
+                ),
                 "type": data["type"],
             }
             if validator.user.value:
-                nb = pynetbox.api(url=decouple.config("NETBOX_URL"),
+                nb = pynetbox.api(
-                                  token=decouple.config("NETBOX_TOKEN"))
+                    url=env_vars.get("NETBOX_URL"),
-                nb_prefix = nb.ipam.prefixes.get(prefix=decouple.config("PREFIX"))
+                    token=env_vars.get("NETBOX_TOKEN"),
+                )
+                nb_prefix = nb.ipam.prefixes.get(
+                    prefix=env_vars.get("PREFIX")
+                )
 
-                prefix = nb_prefix.available_prefixes.create(data=
+                prefix = nb_prefix.available_prefixes.create(
-                    {
+                    data={
-                        "prefix_length": decouple.config("PREFIX_LENGTH", cast=int),
+                        "prefix_length": env_vars.get(
-                        "description": "{}'s network \"{}\"".format(data["name"],
+                            "PREFIX_LENGTH", cast=int
-                                                                    data["network_name"]),
+                        ),
-                        "is_pool": True
+                        "description": '{}\'s network "{}"'.format(
+                            data["name"], data["network_name"]
+                        ),
+                        "is_pool": True,
                     }
                 )
                 network_entry["ipv6"] = prefix["prefix"]
             else:
                 network_entry["ipv6"] = "fd00::/64"
 
-            network_key = os.path.join(NETWORK_PREFIX, data["name"], data["network_name"])
+            network_key = os.path.join(
+                env_vars.get("NETWORK_PREFIX"),
+                data["name"],
+                data["network_name"],
+            )
             etcd_client.put(network_key, network_entry, value_in_json=True)
             return {"message": "Network successfully added."}
         else:
@@ -410,7 +480,9 @@ class ListUserNetwork(Resource):
         validator = schemas.OTPSchema(data)
 
         if validator.is_valid():
-            prefix = os.path.join(NETWORK_PREFIX, data["name"])
+            prefix = os.path.join(
+                env_vars.get("NETWORK_PREFIX"), data["name"]
+            )
             networks = etcd_client.get_prefix(prefix, value_in_json=True)
             user_networks = []
             for net in networks:
@@ -443,5 +515,20 @@ api.add_resource(ListHost, "/host/list")
 
 api.add_resource(CreateNetwork, "/network/create")
 
-if __name__ == "__main__":
+
+def main():
+    data = {
+        "is_public": True,
+        "type": "ceph",
+        "name": "images",
+        "description": "first ever public image-store",
+        "attributes": {"list": [], "key": [], "pool": "images"},
+    }
+
+    etcd_client.put(os.path.join(env_vars.get('IMAGE_STORE_PREFIX'), uuid4().hex), json.dumps(data))
+
     app.run(host="::", debug=True)
+
+
+if __name__ == "__main__":
+    main()

api/schemas.py

@@ -16,21 +16,15 @@ inflexible for our purpose.
 
 import json
 import os
+
 import bitmath
 
-import helper
+from common.host import HostStatus
-
+from common.vm import VMStatus
-from ucloud_common.host import HostPool, HostStatus
+from config import etcd_client, env_vars, vm_pool, host_pool
-from ucloud_common.vm import VmPool, VMStatus
+from . import helper
-
+from .common_fields import Field, VmUUIDField
-from common_fields import Field, VmUUIDField, Optional
+from .helper import check_otp, resolve_vm_name
-from helper import check_otp, resolve_vm_name
-from config import etcd_client as client
-from config import (HOST_PREFIX, VM_PREFIX, IMAGE_PREFIX,
-                    FILE_PREFIX, IMAGE_STORE_PREFIX, NETWORK_PREFIX)
-
-HOST_POOL = HostPool(client, HOST_PREFIX)
-VM_POOL = VmPool(client, VM_PREFIX)
 
 
 class BaseSchema:
@@ -108,14 +102,14 @@ class CreateImageSchema(BaseSchema):
         super().__init__(data, fields)
 
     def file_uuid_validation(self):
-        file_entry = client.get(os.path.join(FILE_PREFIX, self.uuid.value))
+        file_entry = etcd_client.get(os.path.join(env_vars.get('FILE_PREFIX'), self.uuid.value))
         if file_entry is None:
             self.add_error(
                 "Image File with uuid '{}' Not Found".format(self.uuid.value)
             )
 
     def image_store_name_validation(self):
-        image_stores = list(client.get_prefix(IMAGE_STORE_PREFIX))
+        image_stores = list(etcd_client.get_prefix(env_vars.get('IMAGE_STORE_PREFIX')))
 
         image_store = next(
             filter(
@@ -222,10 +216,9 @@ class CreateVMSchema(OTPSchema):
 
         super().__init__(data=data, fields=fields)
 
-
     def image_validation(self):
         try:
-            image_uuid = helper.resolve_image_name(self.image.value, client)
+            image_uuid = helper.resolve_image_name(self.image.value, etcd_client)
         except Exception as e:
             self.add_error(str(e))
         else:
@@ -242,7 +235,7 @@ class CreateVMSchema(OTPSchema):
 
         if _network:
             for net in _network:
-                network = client.get(os.path.join(NETWORK_PREFIX,
+                network = etcd_client.get(os.path.join(env_vars.get('NETWORK_PREFIX'),
                                                        self.name.value,
                                                        net), value_in_json=True)
                 if not network:
@@ -316,7 +309,7 @@ class VMStatusSchema(OTPSchema):
         super().__init__(data, fields)
 
     def validation(self):
-        vm = VM_POOL.get(self.uuid.value)
+        vm = vm_pool.get(self.uuid.value)
         if not (
                 vm.value["owner"] == self.name.value or self.realm.value == "ungleich-admin"
         ):
@@ -349,7 +342,7 @@ class VmActionSchema(OTPSchema):
             )
 
     def validation(self):
-        vm = VM_POOL.get(self.uuid.value)
+        vm = vm_pool.get(self.uuid.value)
         if not (
                 vm.value["owner"] == self.name.value or self.realm.value == "ungleich-admin"
         ):
@@ -389,14 +382,14 @@ class VmMigrationSchema(OTPSchema):
 
     def destination_validation(self):
         host_key = self.destination.value
-        host = HOST_POOL.get(host_key)
+        host = host_pool.get(host_key)
         if not host:
             self.add_error("No Such Host ({}) exists".format(self.destination.value))
         elif host.status != HostStatus.alive:
             self.add_error("Destination Host is dead")
 
     def validation(self):
-        vm = VM_POOL.get(self.uuid.value)
+        vm = vm_pool.get(self.uuid.value)
         if not (
                 vm.value["owner"] == self.name.value or self.realm.value == "ungleich-admin"
         ):
@@ -405,7 +398,7 @@ class VmMigrationSchema(OTPSchema):
         if vm.status != VMStatus.running:
             self.add_error("Can't migrate non-running VM")
 
-        if vm.hostname == os.path.join(HOST_PREFIX, self.destination.value):
+        if vm.hostname == os.path.join(env_vars.get('HOST_PREFIX'), self.destination.value):
             self.add_error("Destination host couldn't be same as Source Host")
 
 
@@ -447,7 +440,7 @@ class CreateNetwork(OTPSchema):
         super().__init__(data, fields=fields)
 
     def network_name_validation(self):
-        network = client.get(os.path.join(NETWORK_PREFIX,
+        network = etcd_client.get(os.path.join(env_vars.get('NETWORK_PREFIX'),
                                                self.name.value,
                                                self.network_name.value),
                                   value_in_json=True)

common/classes.py

@@ -0,0 +1,48 @@
+from decouple import Config, RepositoryEnv, UndefinedValueError
+from etcd3_wrapper import EtcdEntry
+
+
+class EnvironmentVariables:
+    def __init__(self, env_file):
+        try:
+            env_config = Config(RepositoryEnv(env_file))
+        except FileNotFoundError:
+            print("{} does not exists".format(env_file))
+            exit(1)
+        else:
+            self.config = env_config
+
+    def get(self, *args, **kwargs):
+        """Return value of var from env_vars"""
+        try:
+            value = self.config.get(*args, **kwargs)
+        except UndefinedValueError as e:
+            print(e)
+            exit(1)
+        else:
+            return value
+
+
+class SpecificEtcdEntryBase:
+    def __init__(self, e: EtcdEntry):
+        self.key = e.key
+
+        for k in e.value.keys():
+            self.__setattr__(k, e.value[k])
+
+    def original_keys(self):
+        r = dict(self.__dict__)
+        if "key" in r:
+            del r["key"]
+        return r
+
+    @property
+    def value(self):
+        return self.original_keys()
+
+    @value.setter
+    def value(self, v):
+        self.__dict__ = v
+
+    def __repr__(self):
+        return str(dict(self.__dict__))

common/counters.py

@@ -0,0 +1,21 @@
+from etcd3_wrapper import Etcd3Wrapper
+
+
+def increment_etcd_counter(etcd_client: Etcd3Wrapper, key):
+    kv = etcd_client.get(key)
+
+    if kv:
+        counter = int(kv.value)
+        counter = counter + 1
+    else:
+        counter = 1
+
+    etcd_client.put(key, str(counter))
+    return counter
+
+
+def get_etcd_counter(etcd_client: Etcd3Wrapper, key):
+    kv = etcd_client.get(key)
+    if kv:
+        return int(kv.value)
+    return None

common/helpers.py

@@ -0,0 +1,39 @@
+import logging
+import socket
+
+from os.path import join as join_path
+
+
+def create_package_loggers(packages, base_path, mode="a"):
+    loggers = {}
+    for pkg in packages:
+        logger = logging.getLogger(pkg)
+        logger_handler = logging.FileHandler(
+            join_path(base_path, "{}.txt".format(pkg)),
+            mode=mode
+        )
+        logger.setLevel(logging.DEBUG)
+        logger_handler.setFormatter(logging.Formatter(fmt="%(asctime)s: %(levelname)s - %(message)s",
+                                                      datefmt="%d-%b-%y %H:%M:%S"))
+        logger.addHandler(logger_handler)
+        loggers[pkg] = logger
+
+
+# TODO: Should be removed as soon as migration
+#       mechanism is finalized inside ucloud
+def get_ipv4_address():
+    # If host is connected to internet
+    #   Return IPv4 address of machine
+    # Otherwise, return 127.0.0.1
+    with socket.socket(socket.AF_INET, socket.SOCK_DGRAM) as s:
+        try:
+            s.connect(("8.8.8.8", 80))
+        except socket.timeout:
+            address = "127.0.0.1"
+        except Exception as e:
+            logging.getLogger().exception(e)
+            address = "127.0.0.1"
+        else:
+            address = s.getsockname()[0]
+
+    return address

common/host.py

@@ -0,0 +1,67 @@
+import time
+from datetime import datetime
+from os.path import join
+from typing import List
+
+from .classes import SpecificEtcdEntryBase
+
+
+class HostStatus:
+    """Possible Statuses of ucloud host."""
+
+    alive = "ALIVE"
+    dead = "DEAD"
+
+
+class HostEntry(SpecificEtcdEntryBase):
+    """Represents Host Entry Structure and its supporting methods."""
+
+    def __init__(self, e):
+        self.specs = None  # type: dict
+        self.hostname = None  # type: str
+        self.status = None  # type: str
+        self.last_heartbeat = None  # type: str
+
+        super().__init__(e)
+
+    def update_heartbeat(self):
+        self.status = HostStatus.alive
+        self.last_heartbeat = time.strftime("%Y-%m-%d %H:%M:%S")
+
+    def is_alive(self):
+        last_heartbeat = datetime.strptime(self.last_heartbeat, "%Y-%m-%d %H:%M:%S")
+        delta = datetime.now() - last_heartbeat
+        if delta.total_seconds() > 60:
+            return False
+        return True
+
+    def declare_dead(self):
+        self.status = HostStatus.dead
+        self.last_heartbeat = time.strftime("%Y-%m-%d %H:%M:%S")
+
+
+class HostPool:
+    def __init__(self, etcd_client, host_prefix):
+        self.client = etcd_client
+        self.prefix = host_prefix
+
+    @property
+    def hosts(self) -> List[HostEntry]:
+        _hosts = self.client.get_prefix(self.prefix, value_in_json=True)
+        return [HostEntry(host) for host in _hosts]
+
+    def get(self, key):
+        if not key.startswith(self.prefix):
+            key = join(self.prefix, key)
+        v = self.client.get(key, value_in_json=True)
+        if v:
+            return HostEntry(v)
+        return None
+
+    def put(self, obj: HostEntry):
+        self.client.put(obj.key, obj.value, value_in_json=True)
+
+    def by_status(self, status, _hosts=None):
+        if _hosts is None:
+            _hosts = self.hosts
+        return list(filter(lambda x: x.status == status, _hosts))

common/request.py

@@ -0,0 +1,46 @@
+import json
+from os.path import join
+from uuid import uuid4
+
+from etcd3_wrapper.etcd3_wrapper import PsuedoEtcdEntry
+
+from .classes import SpecificEtcdEntryBase
+
+
+class RequestType:
+    CreateVM = "CreateVM"
+    ScheduleVM = "ScheduleVM"
+    StartVM = "StartVM"
+    StopVM = "StopVM"
+    InitVMMigration = "InitVMMigration"
+    TransferVM = "TransferVM"
+    DeleteVM = "DeleteVM"
+
+
+class RequestEntry(SpecificEtcdEntryBase):
+
+    def __init__(self, e):
+        self.type = None  # type: str
+        self.migration = None  # type: bool
+        self.destination = None  # type: str
+        self.uuid = None  # type: str
+        self.hostname = None  # type: str
+        super().__init__(e)
+
+    @classmethod
+    def from_scratch(cls, request_prefix, **kwargs):
+        e = PsuedoEtcdEntry(join(request_prefix, uuid4().hex),
+                            value=json.dumps(kwargs).encode("utf-8"), value_in_json=True)
+        return cls(e)
+
+
+class RequestPool:
+    def __init__(self, etcd_client, request_prefix):
+        self.client = etcd_client
+        self.prefix = request_prefix
+
+    def put(self, obj: RequestEntry):
+        if not obj.key.startswith(self.prefix):
+            obj.key = join(self.prefix, obj.key)
+
+        self.client.put(obj.key, obj.value, value_in_json=True)

common/vm.py

@@ -0,0 +1,110 @@
+from contextlib import contextmanager
+from datetime import datetime
+from os.path import join
+
+from .classes import SpecificEtcdEntryBase
+
+
+class VMStatus:
+    # Must be only assigned to brand new VM
+    requested_new = "REQUESTED_NEW"
+
+    # Only Assigned to already created vm
+    requested_start = "REQUESTED_START"
+
+    # These all are for running vms
+    requested_shutdown = "REQUESTED_SHUTDOWN"
+    requested_migrate = "REQUESTED_MIGRATE"
+    requested_delete = "REQUESTED_DELETE"
+    # either its image is not found or user requested
+    # to delete it
+    deleted = "DELETED"
+
+    stopped = "STOPPED"  # After requested_shutdown
+    killed = "KILLED"  # either host died or vm died itself
+
+    running = "RUNNING"
+
+    error = "ERROR"  # An error occurred that cannot be resolved automatically
+
+
+class VMEntry(SpecificEtcdEntryBase):
+
+    def __init__(self, e):
+        self.owner = None  # type: str
+        self.specs = None  # type: dict
+        self.hostname = None  # type: str
+        self.status = None  # type: str
+        self.image_uuid = None  # type: str
+        self.log = None  # type: list
+        self.in_migration = None  # type: bool
+
+        super().__init__(e)
+
+    @property
+    def uuid(self):
+        return self.key.split("/")[-1]
+
+    def declare_killed(self):
+        self.hostname = ""
+        self.in_migration = False
+        if self.status == VMStatus.running:
+            self.status = VMStatus.killed
+
+    def declare_stopped(self):
+        self.hostname = ""
+        self.in_migration = False
+        self.status = VMStatus.stopped
+
+    def add_log(self, msg):
+        self.log = self.log[:5]
+        self.log.append("{} - {}".format(datetime.now().isoformat(), msg))
+
+    @property
+    def path(self):
+        return "rbd:uservms/{}".format(self.uuid)
+
+
+class VmPool:
+    def __init__(self, etcd_client, vm_prefix):
+        self.client = etcd_client
+        self.prefix = vm_prefix
+
+    @property
+    def vms(self):
+        _vms = self.client.get_prefix(self.prefix, value_in_json=True)
+        return [VMEntry(vm) for vm in _vms]
+
+    def by_host(self, host, _vms=None):
+        if _vms is None:
+            _vms = self.vms
+        return list(filter(lambda x: x.hostname == host, _vms))
+
+    def by_status(self, status, _vms=None):
+        if _vms is None:
+            _vms = self.vms
+        return list(filter(lambda x: x.status == status, _vms))
+
+    def except_status(self, status, _vms=None):
+        if _vms is None:
+            _vms = self.vms
+        return list(filter(lambda x: x.status != status, _vms))
+
+    def get(self, key):
+        if not key.startswith(self.prefix):
+            key = join(self.prefix, key)
+        v = self.client.get(key, value_in_json=True)
+        if v:
+            return VMEntry(v)
+        return None
+
+    def put(self, obj: VMEntry):
+        self.client.put(obj.key, obj.value, value_in_json=True)
+
+    @contextmanager
+    def get_put(self, key) -> VMEntry:
+        # Updates object at key on exit
+        obj = self.get(key)
+        yield obj
+        if obj:
+            self.put(obj)

config.py

@@ -0,0 +1,19 @@
+from etcd3_wrapper import Etcd3Wrapper
+
+from common.classes import EnvironmentVariables
+from common.host import HostPool
+from common.request import RequestPool
+from common.vm import VmPool
+
+env_vars = EnvironmentVariables('/etc/ucloud/ucloud.conf')
+
+etcd_wrapper_args = ()
+etcd_wrapper_kwargs = {"host": env_vars.get("ETCD_URL")}
+
+etcd_client = Etcd3Wrapper(*etcd_wrapper_args, **etcd_wrapper_kwargs)
+
+host_pool = HostPool(etcd_client, env_vars.get('HOST_PREFIX'))
+vm_pool = VmPool(etcd_client, env_vars.get('VM_PREFIX'))
+request_pool = RequestPool(etcd_client, env_vars.get('REQUEST_PREFIX'))
+
+running_vms = []

docs/source/conf.py

@@ -21,7 +21,6 @@ project = 'ucloud'
 copyright = '2019, ungleich'
 author = 'ungleich'
 
-
 # -- General configuration ---------------------------------------------------
 
 # Add any Sphinx extension module names here, as strings. They can be
@@ -39,7 +38,6 @@ templates_path = ['_templates']
 # This pattern also affects html_static_path and html_extra_path.
 exclude_patterns = []
 
-
 # -- Options for HTML output -------------------------------------------------
 
 # The theme to use for HTML and HTML Help pages.  See the documentation for

docs/source/index.rst

@@ -15,7 +15,7 @@ Welcome to ucloud's documentation!
    usage/usage-for-admins
    usage/usage-for-users
    usage/how-to-create-an-os-image-for-ucloud
-
+   misc/todo
 
 Indices and tables
 ==================

docs/source/introduction/installation.rst

@@ -36,6 +36,9 @@ Enable Edge Repos, Update and Upgrade
 
 Install Dependencies
 ~~~~~~~~~~~~~~~~~~~~
+.. note::
+    The installation and configuration of a production grade etcd cluster
+    is out of scope of this manual. So, we will install etcd with default configuration.
 
 .. code-block:: sh
     :linenos:

docs/source/misc/todo.rst

@@ -0,0 +1,7 @@
+TODO
+====
+
+* Check for :code:`etcd3.exceptions.ConnectionFailedError` when calling some etcd operation to
+  avoid crashing whole application.
+* Throw KeyError instead of returning None when some key is not found in etcd.
+* Expose more details in ListUserFiles.

docs/source/usage/usage-for-admins.rst

@@ -55,7 +55,28 @@ To start host we created earlier, execute the following command
 
 Create OS Image
 ---------------
-First, we need to upload the file.
+
+Create ucloud-init ready OS image (Optional)
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+This step is optional if you just want to test ucloud. However, sooner or later
+you want to create OS images with ucloud-init to properly
+contexualize VMs.
+
+1. Start a VM with OS image on which you want to install ucloud-init
+2. Execute the following command on the started VM
+
+   .. code-block:: sh
+
+    apk add git
+    git clone https://code.ungleich.ch/ucloud/ucloud-init.git
+    cd ucloud-init
+    sh ./install.sh
+3. Congratulations. Your image is now ucloud-init ready.
+
+
+Upload Sample OS Image
+~~~~~~~~~~~~~~~~~~~~~~
+Execute the following to upload the sample OS image file.
 
 .. code-block:: sh
 
@@ -63,7 +84,7 @@ First, we need to upload the file.
     (cd /var/www/admin && wget http://[2a0a:e5c0:2:12:0:f0ff:fea9:c3d9]/alpine-untouched.qcow2)
 
 Run File Scanner and Image Scanner
-------------------------------------
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Currently, our uploaded file *alpine-untouched.qcow2* is not tracked by ucloud. We can only make
 images from tracked files. So, we need to track the file by running File Scanner
 

filescanner/main.py

@@ -1,14 +1,13 @@
-import os
 import glob
+import os
 import pathlib
-import time
-import hashlib
 import subprocess as sp
-
+import time
-from decouple import config
-from etcd3_wrapper import Etcd3Wrapper
 from uuid import uuid4
 
+from etcd3_wrapper import Etcd3Wrapper
+
+from config import env_vars
 
 
 def getxattr(file, attr):
@@ -68,12 +67,13 @@ except Exception as e:
     print('Make sure you have getfattr and setfattr available')
     exit(1)
 
+
 def main():
-    BASE_DIR = config("BASE_DIR")
+    BASE_DIR = env_vars.get("BASE_DIR")
 
-    FILE_PREFIX = config("FILE_PREFIX")
+    FILE_PREFIX = env_vars.get("FILE_PREFIX")
 
-    etcd_client = Etcd3Wrapper(host=config("ETCD_URL"))
+    etcd_client = Etcd3Wrapper(host=env_vars.get("ETCD_URL"))
 
     # Recursively Get All Files and Folder below BASE_DIR
     files = glob.glob("{}/**".format(BASE_DIR), recursive=True)

host/__init__.py

@@ -0,0 +1,3 @@
+import logging
+
+logger = logging.getLogger(__name__)

host/config.py

@@ -1,36 +0,0 @@
-import logging
-
-from etcd3_wrapper import Etcd3Wrapper
-from ucloud_common.vm import VmPool
-from ucloud_common.host import HostPool
-from ucloud_common.request import RequestPool
-from decouple import config
-
-WITHOUT_CEPH = config("WITHOUT_CEPH", False, cast=bool)
-
-logging.basicConfig(
-    level=logging.DEBUG,
-    filename="log.txt",
-    filemode="a",
-    format="%(asctime)s: %(levelname)s - %(message)s",
-    datefmt="%d-%b-%y %H:%M:%S",
-)
-
-etcd_wrapper_args = ()
-etcd_wrapper_kwargs = {"host": config("ETCD_URL")}
-
-etcd_client = Etcd3Wrapper(*etcd_wrapper_args, **etcd_wrapper_kwargs)
-
-HOST_PREFIX = config("HOST_PREFIX")
-NETWORK_PREFIX = config("NETWORK_PREFIX")
-VM_PREFIX = config("VM_PREFIX")
-REQUEST_PREFIX = config("REQUEST_PREFIX")
-VM_DIR = config("VM_DIR")
-IMAGE_DIR = config("IMAGE_DIR")
-
-
-host_pool = HostPool(etcd_client, HOST_PREFIX)
-vm_pool = VmPool(etcd_client, VM_PREFIX)
-request_pool = RequestPool(etcd_client, REQUEST_PREFIX)
-
-running_vms = []

host/main.py

@@ -1,24 +1,21 @@
 import argparse
-import time
-import os
-import sys
-import virtualmachine
 import multiprocessing as mp
+import os
+import time
 
-from ucloud_common.host import HostEntry
-from ucloud_common.request import RequestEntry, RequestType
-
-from config import (vm_pool, host_pool, request_pool,
-                    etcd_client, logging, running_vms,
-                    etcd_wrapper_args, etcd_wrapper_kwargs,
-                    REQUEST_PREFIX, HOST_PREFIX,
-                    WITHOUT_CEPH, VM_DIR, HostPool)
 from etcd3_wrapper import Etcd3Wrapper
-import etcd3
+
+from common.request import RequestEntry, RequestType
+from config import (vm_pool, request_pool,
+                    etcd_client, running_vms,
+                    etcd_wrapper_args, etcd_wrapper_kwargs,
+                    HostPool, env_vars)
+from . import virtualmachine
+from host import logger
 
 def update_heartbeat(host):
     client = Etcd3Wrapper(*etcd_wrapper_args, **etcd_wrapper_kwargs)
-    host_pool = HostPool(client, HOST_PREFIX)
+    host_pool = HostPool(client, env_vars.get('HOST_PREFIX'))
     this_host = next(filter(lambda h: h.hostname == host, host_pool.hosts), None)
 
     while True:
@@ -26,6 +23,7 @@ def update_heartbeat(host):
         host_pool.put(this_host)
         time.sleep(10)
 
+
 def maintenance(host):
     # To capture vm running according to running_vms list
 
@@ -65,31 +63,25 @@ def maintenance(host):
                 running_vms.remove(_vm)
 
 
-def main():
+def main(hostname):
-    argparser = argparse.ArgumentParser()
+    assert env_vars.get('WITHOUT_CEPH') and os.path.isdir(env_vars.get('VM_DIR')), (
-    argparser.add_argument("hostname", help="Name of this host. e.g /v1/host/1")
+        "You have set env_vars.get('WITHOUT_CEPH') to True. So, the vm directory mentioned"
-    args = argparser.parse_args()
-
-    assert WITHOUT_CEPH and os.path.isdir(VM_DIR), (
-        "You have set WITHOUT_CEPH to True. So, the vm directory mentioned" 
         " in .env file must exists. But, it don't.")
 
-    mp.set_start_method('spawn')
+    heartbeat_updating_process = mp.Process(target=update_heartbeat, args=(hostname,))
-    heartbeat_updating_process = mp.Process(target=update_heartbeat, args=(args.hostname,))
 
-    host_pool = HostPool(etcd_client, HOST_PREFIX)
+    host_pool = HostPool(etcd_client, env_vars.get('HOST_PREFIX'))
-    host = next(filter(lambda h: h.hostname == args.hostname, host_pool.hosts), None)
+    host = next(filter(lambda h: h.hostname == hostname, host_pool.hosts), None)
     assert host is not None, "No such host"
 
     try:
         heartbeat_updating_process.start()
     except Exception as e:
-        logging.info("No Need To Go Further. Our heartbeat updating mechanism is not working")
+        logger.info("No Need To Go Further. Our heartbeat updating mechanism is not working")
-        logging.exception(e)
+        logger.exception(e)
         exit(-1)
 
-    
+    logger.info("%s Session Started %s", '*' * 5, '*' * 5)
-    logging.info("%s Session Started %s", '*' * 5, '*' * 5)
 
     # It is seen that under heavy load, timeout event doesn't come
     # in a predictive manner (which is intentional because we give
@@ -99,22 +91,21 @@ def main():
     # update the heart beat in a predictive manner we start Heart
     # beat updating mechanism in separated thread
 
-
     for events_iterator in [
-        etcd_client.get_prefix(REQUEST_PREFIX, value_in_json=True),
+        etcd_client.get_prefix(env_vars.get('REQUEST_PREFIX'), value_in_json=True),
-        etcd_client.watch_prefix(REQUEST_PREFIX, timeout=10, value_in_json=True),
+        etcd_client.watch_prefix(env_vars.get('REQUEST_PREFIX'), timeout=10, value_in_json=True),
     ]:
         for request_event in events_iterator:
             request_event = RequestEntry(request_event)
 
             if request_event.type == "TIMEOUT":
-                logging.info("Timeout Event")
+                logger.info("Timeout Event")
                 maintenance(host)
                 continue
 
             # If the event is directed toward me OR I am destination of a InitVMMigration
-            if (request_event.hostname == host.key or request_event.destination == host.key):
+            if request_event.hostname == host.key or request_event.destination == host.key:
-                logging.debug("EVENT: %s", request_event)
+                logger.debug("EVENT: %s", request_event)
 
                 request_pool.client.client.delete(request_event.key)
                 vm_entry = vm_pool.get(request_event.uuid)
@@ -135,11 +126,14 @@ def main():
                     elif request_event.type == RequestType.TransferVM:
                         virtualmachine.transfer(request_event)
                 else:
-                    logging.info("VM Entry missing")
+                    logger.info("VM Entry missing")
 
-                logging.info("Running VMs %s", running_vms)
+                logger.info("Running VMs %s", running_vms)
 
 
 if __name__ == "__main__":
-    main()
+    argparser = argparse.ArgumentParser()
-   
+    argparser.add_argument("hostname", help="Name of this host. e.g /v1/host/1")
+    args = argparser.parse_args()
+    mp.set_start_method('spawn')
+    main(args.hostname)

host/qmp/__init__.py

@@ -15,15 +15,13 @@
 import errno
 import logging
 import os
-import subprocess
-import re
 import shutil
 import socket
+import subprocess
 import tempfile
 
 from . import qmp
 
-
 LOG = logging.getLogger(__name__)
 
 # Mapping host architecture to any additional architectures it can
@@ -33,6 +31,7 @@ ADDITIONAL_ARCHES = {
     "aarch64": "armhf"
 }
 
+
 def kvm_available(target_arch=None):
     host_arch = os.uname()[4]
     if target_arch and target_arch != host_arch:
@@ -56,10 +55,12 @@ class QEMUMachineAddDeviceError(QEMUMachineError):
     failures reported by the QEMU binary itself.
     """
 
+
 class MonitorResponseError(qmp.QMPError):
     """
     Represents erroneous QMP monitor reply
     """
+
     def __init__(self, reply):
         try:
             desc = reply["error"]["desc"]
@@ -453,6 +454,7 @@ class QEMUMachine(object):
                 See event_match for details.
         timeout: QEMUMonitorProtocol.pull_event timeout parameter.
         """
+
         def _match(event):
             for name, match in events:
                 if (event['event'] == name and

host/qmp/qmp.py

@@ -8,10 +8,10 @@
 # This work is licensed under the terms of the GNU GPL, version 2.  See
 # the COPYING file in the top-level directory.
 
-import json
 import errno
-import socket
+import json
 import logging
+import socket
 
 
 class QMPError(Exception):
@@ -31,7 +31,6 @@ class QMPTimeoutError(QMPError):
 
 
 class QEMUMonitorProtocol(object):
-
     #: Logger object for debugging messages
     logger = logging.getLogger('QMP')
     #: Socket's error class

host/virtualmachine.py

@@ -6,30 +6,24 @@
 
 import errno
 import os
+import random
 import subprocess as sp
 import tempfile
 import time
-import random
-import ipaddress
-
 from functools import wraps
 from os.path import join
-from typing import Union
 from string import Template
+from typing import Union
 
 import bitmath
 import sshtunnel
-import qmp
-
-from decouple import config
-from ucloud_common.helpers import get_ipv4_address
-from ucloud_common.request import RequestEntry, RequestType
-from ucloud_common.vm import VMEntry, VMStatus
-
-from config import (WITHOUT_CEPH, VM_PREFIX, VM_DIR, IMAGE_DIR,
-                    NETWORK_PREFIX, etcd_client, logging,
-                    request_pool, running_vms, vm_pool)
 
+from common.helpers import get_ipv4_address
+from common.request import RequestEntry, RequestType
+from common.vm import VMEntry, VMStatus
+from config import etcd_client, request_pool, running_vms, vm_pool, env_vars
+from . import qmp
+from host import logger
 
 class VM:
     def __init__(self, key, handle, vnc_socket_file):
@@ -121,9 +115,9 @@ def get_start_command_args(
     vm_uuid = vm_entry.uuid
     vm_networks = vm_entry.network
 
-    if WITHOUT_CEPH:
+    if env_vars.get('WITHOUT_CEPH'):
         command = "-drive file={},format=raw,if=virtio,cache=none".format(
-            os.path.join(VM_DIR, vm_uuid)
+            os.path.join(env_vars.get('VM_DIR'), vm_uuid)
         )
     else:
         command = "-drive file=rbd:uservms/{},format=raw,if=virtio,cache=none".format(
@@ -143,14 +137,14 @@ def get_start_command_args(
     for network_and_mac in vm_networks:
         network_name, mac = network_and_mac
 
-        _key = os.path.join(NETWORK_PREFIX, vm_entry.owner, network_name)
+        _key = os.path.join(env_vars.get('NETWORK_PREFIX'), vm_entry.owner, network_name)
         network = etcd_client.get(_key, value_in_json=True)
         network_type = network.value["type"]
         network_id = str(network.value["id"])
         network_ipv6 = network.value["ipv6"]
 
         if network_type == "vxlan":
-            tap = create_vxlan_br_tap(network_id, config("VXLAN_PHY_DEV"), network_ipv6)
+            tap = create_vxlan_br_tap(network_id, env_vars.get("VXLAN_PHY_DEV"), network_ipv6)
             update_radvd_conf(etcd_client)
 
         command += " -netdev tap,id=vmnet{net_id},ifname={tap},script=no,downscript=no" \
@@ -189,15 +183,15 @@ def need_running_vm(func):
         if vm:
             try:
                 status = vm.handle.command("query-status")
-                logging.debug("VM Status Check - %s", status)
+                logger.debug("VM Status Check - %s", status)
             except Exception as exception:
-                logging.info("%s failed - VM %s %s", func.__name__, e, exception)
+                logger.info("%s failed - VM %s %s", func.__name__, e, exception)
             else:
                 return func(e)
 
             return None
         else:
-            logging.info("%s failed because VM %s is not running", func.__name__, e.key)
+            logger.info("%s failed because VM %s is not running", func.__name__, e.key)
             return None
 
     return wrapper
@@ -206,18 +200,18 @@ def need_running_vm(func):
 def create(vm_entry: VMEntry):
     vm_hdd = int(bitmath.parse_string(vm_entry.specs["os-ssd"]).to_MB())
 
-    if WITHOUT_CEPH:
+    if env_vars.get('WITHOUT_CEPH'):
         _command_to_create = [
             "cp",
-            os.path.join(IMAGE_DIR, vm_entry.image_uuid),
+            os.path.join(env_vars.get('IMAGE_DIR'), vm_entry.image_uuid),
-            os.path.join(VM_DIR, vm_entry.uuid),
+            os.path.join(env_vars.get('VM_DIR'), vm_entry.uuid),
         ]
 
         _command_to_extend = [
             "qemu-img",
             "resize",
             "-f", "raw",
-            os.path.join(VM_DIR, vm_entry.uuid),
+            os.path.join(env_vars.get('VM_DIR'), vm_entry.uuid),
             "{}M".format(vm_hdd),
         ]
     else:
@@ -240,22 +234,22 @@ def create(vm_entry: VMEntry):
         sp.check_output(_command_to_create)
     except sp.CalledProcessError as e:
         if e.returncode == errno.EEXIST:
-            logging.debug("Image for vm %s exists", vm_entry.uuid)
+            logger.debug("Image for vm %s exists", vm_entry.uuid)
             # File Already exists. No Problem Continue
             return
 
         # This exception catches all other exceptions
         # i.e FileNotFound (BaseImage), pool Does Not Exists etc.
-        logging.exception(e)
+        logger.exception(e)
 
         vm_entry.status = "ERROR"
     else:
         try:
             sp.check_output(_command_to_extend)
         except Exception as e:
-            logging.exception(e)
+            logger.exception(e)
         else:
-            logging.info("New VM Created")
+            logger.info("New VM Created")
 
 
 def start(vm_entry: VMEntry):
@@ -263,7 +257,7 @@ def start(vm_entry: VMEntry):
 
     # VM already running. No need to proceed further.
     if _vm:
-        logging.info("VM %s already running", vm_entry.uuid)
+        logger.info("VM %s already running", vm_entry.uuid)
         return
     else:
         create(vm_entry)
@@ -282,19 +276,19 @@ def stop(vm_entry):
 
 
 def delete(vm_entry):
-    logging.info("Deleting VM | %s", vm_entry)
+    logger.info("Deleting VM | %s", vm_entry)
     stop(vm_entry)
     path_without_protocol = vm_entry.path[vm_entry.path.find(":") + 1:]
 
-    if WITHOUT_CEPH:
+    if env_vars.get('WITHOUT_CEPH'):
-        vm_deletion_command = ["rm", os.path.join(VM_DIR, vm_entry.uuid)]
+        vm_deletion_command = ["rm", os.path.join(env_vars.get('VM_DIR'), vm_entry.uuid)]
     else:
         vm_deletion_command = ["rbd", "rm", path_without_protocol]
 
     try:
         sp.check_output(vm_deletion_command)
     except Exception as e:
-        logging.exception(e)
+        logger.exception(e)
     else:
         etcd_client.client.delete(vm_entry.key)
 
@@ -307,20 +301,20 @@ def transfer(request_event):
     _host, _port = request_event.parameters["host"], request_event.parameters["port"]
     _uuid = request_event.uuid
     _destination = request_event.destination_host_key
-    vm = get_vm(running_vms, join(VM_PREFIX, _uuid))
+    vm = get_vm(running_vms, join(env_vars.get('VM_PREFIX'), _uuid))
 
     if vm:
         tunnel = sshtunnel.SSHTunnelForwarder(
             (_host, 22),
-            ssh_username=config("ssh_username"),
+            ssh_username=env_vars.get("ssh_username"),
-            ssh_pkey=config("ssh_pkey"),
+            ssh_pkey=env_vars.get("ssh_pkey"),
-            ssh_private_key_password=config("ssh_private_key_password"),
+            ssh_private_key_password=env_vars.get("ssh_private_key_password"),
             remote_bind_address=("127.0.0.1", _port),
         )
         try:
             tunnel.start()
         except sshtunnel.BaseSSHTunnelForwarderError:
-            logging.exception("Couldn't establish connection to (%s, 22)", _host)
+            logger.exception("Couldn't establish connection to (%s, 22)", _host)
         else:
             vm.handle.command(
                 "migrate", uri="tcp:{}:{}".format(_host, tunnel.local_bind_port)
@@ -356,7 +350,7 @@ def init_migration(vm_entry, destination_host_key):
 
     if _vm:
         # VM already running. No need to proceed further.
-        logging.info("%s Already running", _vm.key)
+        logger.info("%s Already running", _vm.key)
         return
 
     launch_vm(vm_entry, migration=True, migration_port=4444,
@@ -364,13 +358,13 @@ def init_migration(vm_entry, destination_host_key):
 
 
 def launch_vm(vm_entry, migration=False, migration_port=None, destination_host_key=None):
-    logging.info("Starting %s", vm_entry.key)
+    logger.info("Starting %s", vm_entry.key)
 
     vm = create_vm_object(vm_entry, migration=migration, migration_port=migration_port)
     try:
         vm.handle.launch()
     except Exception as e:
-        logging.exception(e)
+        logger.exception(e)
 
         if migration:
             # We don't care whether MachineError or any other error occurred
@@ -392,6 +386,7 @@ def launch_vm(vm_entry, migration=False, migration_port=None, destination_host_k
                 parameters={"host": get_ipv4_address(), "port": 4444},
                 uuid=vm_entry.uuid,
                 destination_host_key=destination_host_key,
+                request_prefix=env_vars.get("REQUEST_PREFIX")
             )
             request_pool.put(r)
         else:
@@ -400,4 +395,3 @@ def launch_vm(vm_entry, migration=False, migration_port=None, destination_host_k
             vm_entry.add_log("Started successfully")
 
         vm_pool.put(vm_entry)
-        

imagescanner/__init__.py

@@ -0,0 +1,3 @@
+import logging
+
+logger = logging.getLogger(__name__)

imagescanner/config.py

@@ -1,22 +0,0 @@
-import logging
-
-from etcd3_wrapper import Etcd3Wrapper
-from decouple import config
-
-BASE_PATH = config("BASE_DIR", "/var/www")
-WITHOUT_CEPH = config("WITHOUT_CEPH", False, cast=bool)
-ETCD_URL = config("ETCD_URL")
-IMAGE_PREFIX = config("IMAGE_PREFIX")
-IMAGE_STORE_PREFIX = config("IMAGE_STORE_PREFIX")
-IMAGE_DIR = config("IMAGE_DIR")
-
-logging.basicConfig(
-    level=logging.DEBUG,
-    filename="log.txt",
-    filemode="a",
-    format="%(asctime)s: %(levelname)s - %(message)s",
-    datefmt="%d-%b-%y %H:%M:%S",
-)
-
-
-client = Etcd3Wrapper(host=ETCD_URL)

imagescanner/main.py

@@ -1,11 +1,10 @@
-import os
 import json
+import os
 import subprocess
 import sys
 
-from config import (logging, client, IMAGE_DIR,
+from config import etcd_client, env_vars
-                    BASE_PATH, WITHOUT_CEPH,
+from imagescanner import logger
-                    IMAGE_PREFIX, IMAGE_STORE_PREFIX)
 
 
 def qemu_img_type(path):
@@ -13,7 +12,7 @@ def qemu_img_type(path):
     try:
         qemu_img_info = subprocess.check_output(qemu_img_info_command)
     except Exception as e:
-        logging.exception(e)
+        logger.exception(e)
         return None
     else:
         qemu_img_info = json.loads(qemu_img_info.decode("utf-8"))
@@ -21,12 +20,12 @@ def qemu_img_type(path):
 
 
 def main():
-    # If you are using WITHOUT_CEPH FLAG in .env
+    # If you are using env_vars.get('WITHOUT_CEPH') FLAG in .env
-    # then please make sure that IMAGE_DIR directory
+    # then please make sure that env_vars.get('IMAGE_DIR') directory
     # exists otherwise this script would fail
-    if WITHOUT_CEPH and not os.path.isdir(IMAGE_DIR):
+    if env_vars.get('WITHOUT_CEPH') and not os.path.isdir(env_vars.get('IMAGE_DIR')):
-        print("You have set WITHOUT_CEPH to True. So,"
+        print("You have set env_vars.get('WITHOUT_CEPH') to True. So,"
-            "the {} must exists. But, it don't".format(IMAGE_DIR))
+              "the {} must exists. But, it don't".format(env_vars.get('IMAGE_DIR')))
         sys.exit(1)
 
     try:
@@ -36,7 +35,7 @@ def main():
         sys.exit(1)
 
     # We want to get images entries that requests images to be created
-    images = client.get_prefix(IMAGE_PREFIX, value_in_json=True)
+    images = etcd_client.get_prefix(env_vars.get('IMAGE_PREFIX'), value_in_json=True)
     images_to_be_created = list(filter(lambda im: im.value['status'] == 'TO_BE_CREATED', images))
 
     for image in images_to_be_created:
@@ -45,9 +44,9 @@ def main():
             image_owner = image.value['owner']
             image_filename = image.value['filename']
             image_store_name = image.value['store_name']
-            image_full_path = os.path.join(BASE_PATH, image_owner, image_filename)
+            image_full_path = os.path.join(env_vars.get('BASE_DIR'), image_owner, image_filename)
 
-            image_stores = client.get_prefix(IMAGE_STORE_PREFIX, value_in_json=True)
+            image_stores = etcd_client.get_prefix(env_vars.get('IMAGE_STORE_PREFIX'), value_in_json=True)
             user_image_store = next(filter(
                 lambda s, store_name=image_store_name: s.value["name"] == store_name,
                 image_stores
@@ -56,16 +55,15 @@ def main():
             image_store_pool = user_image_store.value['attributes']['pool']
 
         except Exception as e:
-            logging.exception(e)
+            logger.exception(e)
         else:
             # At least our basic data is available
 
             qemu_img_convert_command = ["qemu-img", "convert", "-f", "qcow2",
                                         "-O", "raw", image_full_path, "image.raw"]
 
-
+            if env_vars.get('WITHOUT_CEPH'):
-            if WITHOUT_CEPH:
+                image_import_command = ["mv", "image.raw", os.path.join(env_vars.get('IMAGE_DIR'), image_uuid)]
-                image_import_command = ["mv", "image.raw", os.path.join(IMAGE_DIR, image_uuid)]
                 snapshot_creation_command = ["true"]
                 snapshot_protect_command = ["true"]
             else:
@@ -76,7 +74,6 @@ def main():
                 snapshot_protect_command = ["rbd", "snap", "protect",
                                             "{}/{}@protected".format(image_store_pool, image_uuid)]
 
-            
             # First check whether the image is qcow2
 
             if qemu_img_type(image_full_path) == "qcow2":
@@ -92,17 +89,16 @@ def main():
                     subprocess.check_output(snapshot_protect_command)
 
                 except Exception as e:
-                    logging.exception(e)
+                    logger.exception(e)
 
                 else:
                     # Everything is successfully done
                     image.value["status"] = "CREATED"
-                    client.put(image.key, json.dumps(image.value))
+                    etcd_client.put(image.key, json.dumps(image.value))
             else:
                 # The user provided image is either not found or of invalid format
                 image.value["status"] = "INVALID_IMAGE"
-                client.put(image.key, json.dumps(image.value))
+                etcd_client.put(image.key, json.dumps(image.value))
-
 
         try:
             os.remove("image.raw")

metadata/config.py

@@ -1,22 +0,0 @@
-import logging
-
-from etcd3_wrapper import Etcd3Wrapper
-from decouple import config
-
-from ucloud_common.vm import VmPool
-
-logging.basicConfig(
-    level=logging.DEBUG,
-    filename="log.txt",
-    filemode="a",
-    format="%(asctime)s: %(levelname)s - %(message)s",
-    datefmt="%d-%b-%y %H:%M:%S",
-)
-
-
-VM_PREFIX = config("VM_PREFIX")
-USER_PREFIX = config("USER_PREFIX")
-
-etcd_client = Etcd3Wrapper(host=config("ETCD_URL"))
-
-VM_POOL = VmPool(etcd_client, VM_PREFIX)

metadata/main.py

@@ -2,14 +2,15 @@ import os
 
 from flask import Flask, request
 from flask_restful import Resource, Api
-from config import etcd_client, VM_POOL, USER_PREFIX
+
+from config import etcd_client, env_vars, vm_pool
 
 app = Flask(__name__)
 api = Api(app)
 
 
 def get_vm_entry(mac_addr):
-    return next(filter(lambda vm: mac_addr in list(zip(*vm.network))[1], VM_POOL.vms), None)
+    return next(filter(lambda vm: mac_addr in list(zip(*vm.network))[1], vm_pool.vms), None)
 
 
 # https://stackoverflow.com/questions/37140846/how-to-convert-ipv6-link-local-address-to-mac-address-in-python
@@ -43,8 +44,8 @@ class Root(Resource):
             return {'message': 'Metadata for such VM does not exists.'}, 404
         else:
 
-            # {user_prefix}/{realm}/{name}/key
+            # {env_vars.get('USER_PREFIX')}/{realm}/{name}/key
-            etcd_key = os.path.join(USER_PREFIX, data.value['owner_realm'],
+            etcd_key = os.path.join(env_vars.get('USER_PREFIX'), data.value['owner_realm'],
                                     data.value['owner'], 'key')
             etcd_entry = etcd_client.get_prefix(etcd_key, value_in_json=True)
             user_personal_ssh_keys = [key.value for key in etcd_entry]
@@ -81,5 +82,10 @@ class Root(Resource):
 
 api.add_resource(Root, '/')
 
-if __name__ == '__main__':
+
+def main():
     app.run(debug=True, host="::", port="80")
+
+
+if __name__ == '__main__':
+    main()

scheduler/__init__.py

@@ -0,0 +1,3 @@
+import logging
+
+logger = logging.getLogger(__name__)

scheduler/config.py

@@ -1,25 +0,0 @@
-import logging
-
-from decouple import config
-from etcd3_wrapper import Etcd3Wrapper
-from ucloud_common.vm import VmPool
-from ucloud_common.host import HostPool
-from ucloud_common.request import RequestPool
-
-logging.basicConfig(
-    level=logging.DEBUG,
-    filename="log.txt",
-    filemode="a",
-    format="%(asctime)s: %(levelname)s - %(message)s",
-    datefmt="%d-%b-%y %H:%M:%S",
-)
-
-vm_prefix = config("VM_PREFIX")
-host_prefix = config("HOST_PREFIX")
-request_prefix = config("REQUEST_PREFIX")
-
-etcd_client = Etcd3Wrapper(host=config("ETCD_URL"))
-
-vm_pool = VmPool(etcd_client, vm_prefix)
-host_pool = HostPool(etcd_client, host_prefix)
-request_pool = RequestPool(etcd_client, request_prefix)

scheduler/helper.py

@@ -1,18 +1,12 @@
-import bitmath
-
 from collections import Counter
 from functools import reduce
 
-from ucloud_common.vm import VmPool, VMStatus
+import bitmath
-from ucloud_common.host import HostPool, HostStatus
-from ucloud_common.request import RequestEntry, RequestPool, RequestType
 
-from decouple import config
+from common.host import HostStatus
-from config import etcd_client as client
+from common.request import RequestEntry, RequestType
-
+from common.vm import VMStatus
-vm_pool = VmPool(client, config("VM_PREFIX"))
+from config import vm_pool, host_pool, request_pool, env_vars
-host_pool = HostPool(client, config("HOST_PREFIX"))
-request_pool = RequestPool(client, config("REQUEST_PREFIX"))
 
 
 def accumulated_specs(vms_specs):
@@ -111,7 +105,8 @@ def assign_host(vm):
 
     r = RequestEntry.from_scratch(type=RequestType.StartVM,
                                   uuid=vm.uuid,
-                                  hostname=vm.hostname)
+                                  hostname=vm.hostname,
+                                  request_prefix=env_vars.get("REQUEST_PREFIX"))
     request_pool.put(r)
 
     vm.log.append("VM scheduled for starting")

scheduler/main.py

@@ -4,28 +4,26 @@
 #  2. Introduce a status endpoint of the scheduler -
 #     maybe expose a prometheus compatible output
 
-import logging
+from common.request import RequestEntry, RequestType
-
+from config import etcd_client
-from ucloud_common.request import RequestEntry, RequestType
+from config import host_pool, request_pool, vm_pool, env_vars
-
+from .helper import (get_suitable_host, dead_host_mitigation, dead_host_detection,
-from config import etcd_client as client
-from config import (host_pool, request_pool, vm_pool, request_prefix)
-from helper import (get_suitable_host, dead_host_mitigation, dead_host_detection,
                      assign_host, NoSuitableHostFound)
+from scheduler import logger
 
 
 def main():
-    logging.info("%s SESSION STARTED %s", '*' * 5, '*' * 5)
+    logger.info("%s SESSION STARTED %s", '*' * 5, '*' * 5)
 
     pending_vms = []
 
     for request_iterator in [
-            client.get_prefix(request_prefix, value_in_json=True),
+        etcd_client.get_prefix(env_vars.get('REQUEST_PREFIX'), value_in_json=True),
-            client.watch_prefix(request_prefix, timeout=5, value_in_json=True),
+        etcd_client.watch_prefix(env_vars.get('REQUEST_PREFIX'), timeout=5, value_in_json=True),
     ]:
         for request_event in request_iterator:
             request_entry = RequestEntry(request_event)
-            logging.debug("%s, %s", request_entry.key, request_entry.value)
+            logger.debug("%s, %s", request_entry.key, request_entry.value)
 
             # Never Run time critical mechanism inside timeout
             # mechanism because timeout mechanism only comes
@@ -35,9 +33,9 @@ def main():
 
                 # Detect hosts that are dead and set their status
                 # to "DEAD", and their VMs' status to "KILLED"
-                logging.debug("TIMEOUT event occured")
+                logger.debug("TIMEOUT event occured")
                 dead_hosts = dead_host_detection()
-                logging.debug("Dead hosts: %s", dead_hosts)
+                logger.debug("Dead hosts: %s", dead_hosts)
                 dead_host_mitigation(dead_hosts)
 
                 # If there are VMs that weren't assigned a host
@@ -49,15 +47,16 @@ def main():
                     pending_vm_entry = pending_vms.pop()
                     r = RequestEntry.from_scratch(type="ScheduleVM",
                                                   uuid=pending_vm_entry.uuid,
-                                                  hostname=pending_vm_entry.hostname)
+                                                  hostname=pending_vm_entry.hostname,
+                                                  request_prefix=env_vars.get("REQUEST_PREFIX"))
                     request_pool.put(r)
 
             elif request_entry.type == RequestType.ScheduleVM:
                 vm_entry = vm_pool.get(request_entry.uuid)
                 if vm_entry is None:
-                    logging.info("Trying to act on {} but it is deleted".format(request_entry.uuid))
+                    logger.info("Trying to act on {} but it is deleted".format(request_entry.uuid))
                     continue
-                client.client.delete(request_entry.key)  # consume Request
+                etcd_client.client.delete(request_entry.key)  # consume Request
 
                 # If the Request is about a VM which is labelled as "migration"
                 # and has a destination
@@ -67,12 +66,13 @@ def main():
                         get_suitable_host(vm_specs=vm_entry.specs,
                                           hosts=[host_pool.get(request_entry.destination)])
                     except NoSuitableHostFound:
-                        logging.info("Requested destination host doesn't have enough capacity"
+                        logger.info("Requested destination host doesn't have enough capacity"
                                      "to hold %s", vm_entry.uuid)
                     else:
                         r = RequestEntry.from_scratch(type=RequestType.InitVMMigration,
                                                       uuid=request_entry.uuid,
-                                                      destination=request_entry.destination)
+                                                      destination=request_entry.destination,
+                                                      request_prefix=env_vars.get("REQUEST_PREFIX"))
                         request_pool.put(r)
 
                 # If the Request is about a VM that just want to get started/created
@@ -86,7 +86,7 @@ def main():
                         vm_pool.put(vm_entry)
 
                         pending_vms.append(vm_entry)
-                        logging.info("No Resource Left. Emailing admin....")
+                        logger.info("No Resource Left. Emailing admin....")
 
 
 if __name__ == "__main__":

scheduler/tests/test_basics.py

@@ -1,13 +1,10 @@
-import unittest
-import sys
 import json
 import multiprocessing
-import time
+import sys
-
+import unittest
 from datetime import datetime
 from os.path import dirname
 
-
 BASE_DIR = dirname(dirname(__file__))
 sys.path.insert(0, BASE_DIR)
 
@@ -15,13 +12,12 @@ from main import (
     accumulated_specs,
     remaining_resources,
     VmPool,
-    dead_host_detection,
-    dead_host_mitigation,
     main,
 )
 
 from config import etcd_client
 
+
 class TestFunctions(unittest.TestCase):
     @classmethod
     def setUpClass(cls):

scheduler/tests/test_dead_host_mechanism.py

@@ -1,24 +1,18 @@
-import unittest
 import sys
-import json
+import unittest
-import multiprocessing
-import time
-
 from datetime import datetime
 from os.path import dirname
+
 BASE_DIR = dirname(dirname(__file__))
 sys.path.insert(0, BASE_DIR)
 
 from main import (
-    accumulated_specs,
-    remaining_resources,
-    VmPool,
     dead_host_detection,
     dead_host_mitigation,
-    main,
     config
 )
 
+
 class TestDeadHostMechanism(unittest.TestCase):
     def setUp(self):
         self.client = config.etcd_client

ucloud.py

@@ -1,5 +1,10 @@
 import argparse
-import subprocess as sp
+import multiprocessing as mp
+import logging
+
+from os.path import join as join_path
+
+if __name__ == "__main__":
     arg_parser = argparse.ArgumentParser(prog='ucloud',
                                          description='Open Source Cloud Management Software')
     arg_parser.add_argument('component',
@@ -9,8 +14,37 @@ arg_parser.add_argument('component',
     arg_parser.add_argument('component_args', nargs='*')
     args = arg_parser.parse_args()
 
-try:
+    logging.basicConfig(
-    command = ['pipenv', 'run', 'python', 'main.py', *args.component_args]
+        level=logging.DEBUG,
-    sp.run(command, cwd=args.component)
+        filename=join_path("logs.txt"),
-except Exception as error:
+        filemode="a",
-    print(error)
+        format="%(name)s %(asctime)s: %(levelname)s - %(message)s",
+        datefmt="%d-%b-%y %H:%M:%S",
+    )
+
+    if args.component == 'api':
+        from api.main import main
+
+        main()
+    elif args.component == 'host':
+        from host.main import main
+
+        hostname = args.component_args
+        mp.set_start_method('spawn')
+        main(*hostname)
+    elif args.component == 'scheduler':
+        from scheduler.main import main
+
+        main()
+    elif args.component == 'filescanner':
+        from filescanner.main import main
+
+        main()
+    elif args.component == 'imagescanner':
+        from imagescanner.main import main
+
+        main()
+    elif args.component == 'metadata':
+        from metadata.main import main
+
+        main()