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ucloud_common/helpers.py

@@ -0,0 +1,45 @@
+import socket
+import logging
+
+from etcd3_wrapper import EtcdEntry
+
+
+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__)
+        del r["key"]
+        return r
+
+    @property
+    def value(self):
+        return self.original_keys()
+
+    def __repr__(self):
+        return str(dict(self.__dict__))
+
+
+
+# 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

ucloud_common/host.py

@@ -0,0 +1,66 @@
+from typing import List
+from datetime import datetime
+from os.path import join
+
+from .helpers 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 = datetime.utcnow().isoformat()
+
+    def is_alive(self):
+        last_heartbeat = datetime.fromisoformat(self.last_heartbeat)
+        delta = datetime.utcnow() - last_heartbeat
+        if delta.total_seconds() > 60:
+            return False
+        return True
+
+    def declare_dead(self):
+        self.status = HostStatus.dead
+        self.last_heartbeat = datetime.utcnow().isoformat()
+
+
+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))

ucloud_common/request.py

@@ -0,0 +1,48 @@
+import json
+
+from decouple import config
+from etcd3_wrapper.etcd3_wrapper import PsuedoEtcdEntry
+from uuid import uuid4
+from .helpers import SpecificEtcdEntryBase
+from os.path import join
+
+
+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, **kwargs):
+        e = PsuedoEtcdEntry(join(config("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)

ucloud_common/vm.py

@@ -0,0 +1,109 @@
+from contextlib import contextmanager
+from datetime import datetime
+from .helpers import SpecificEtcdEntryBase
+from os.path import join
+
+
+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)