334 lines
10 KiB
Python
334 lines
10 KiB
Python
# TODO: Use Unix File Socket for VNC instead of TCP
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# QEMU Manual
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# https://qemu.weilnetz.de/doc/qemu-doc.html
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# For QEMU Monitor Protocol Commands Information, See
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# https://qemu.weilnetz.de/doc/qemu-doc.html#pcsys_005fmonitor
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import json
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import argparse
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import qmp
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import logging
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import os
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import subprocess
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import atexit
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import signal
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from etcd3_wrapper import Etcd3Wrapper
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from dataclasses import dataclass
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from typing import Union
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from functools import wraps
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from decouple import config
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from datetime import datetime
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from ucloud_common.enums import VMStatus
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running_vms = []
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vnc_port_pool = list(range(0, 100))
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client = Etcd3Wrapper()
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@dataclass
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class VM:
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key: str
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vm: qmp.QEMUMachine
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class RBD(object):
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@staticmethod
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def ls(pool):
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output = ""
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try:
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output = subprocess.check_output(
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["rbd", "ls", pool], stderr=subprocess.PIPE
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).decode("utf-8").strip()
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except subprocess.CalledProcessError as e:
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raise Exception(e.stderr)
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return output.split("\n")
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logging.basicConfig(
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level=logging.DEBUG,
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filename="log.txt",
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filemode="a",
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format="%(asctime)s: %(levelname)s - %(message)s",
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datefmt="%d-%b-%y %H:%M:%S",
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)
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def goodbye(host):
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host.value["status"] = "DEAD"
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host.value["last_heartbeat"] = datetime.utcnow().isoformat()
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client.put(host.key, json.dumps(host.value))
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vms = client.get_prefix("/v1/vm", value_in_json=True)
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vms = filter(lambda v: v.value["hostname"] == host.key, vms)
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for vm in vms:
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vm.value["hostname"] = ""
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if vm.value["status"] in VMStatus.running_vm_statuses:
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vm.value["status"] = VMStatus.requested_start
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client.put(vm.key, vm.value, value_in_json=True)
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logging.info(f"Host {host.key} dead! at {host.value['last_heartbeat']}")
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print("Goodbye")
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os.kill(os.getpid(), signal.SIGKILL)
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def need_running_vm(func):
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@wraps(func)
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def wrapper(e):
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vm = get_vm(running_vms, e.key)
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if vm:
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try:
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status = vm.vm.command("query-status")
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logging.debug(f"VM Status Check - {status}")
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except OSError:
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logging.info(f"{func.__name__} failed - VM {e.key} - Unknown Error")
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return func(e)
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else:
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logging.info(f"{func.__name__} failed because VM {e.key} is not running")
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return
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return wrapper
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def create_vm(vm_uuid, e):
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image = client.get(
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f"/v1/image/{e.value['image_uuid']}", value_in_json=True
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)
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if image:
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logging.debug(image)
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image_uuid = e.value["image_uuid"]
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logging.info("Creating New VM...")
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_command_to_create = f"rbd clone images/{image_uuid}@protected uservms/{vm_uuid}"
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subprocess.call(_command_to_create.split(" "))
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e.value["status"] = "REQUESTED_START"
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client.put(e.key, json.dumps(e.value))
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def start_vm(vm_path, e):
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if not vm_path.split("/")[-1] in RBD.ls("uservms"):
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logging.info(f"Image file of vm {e.key} does not exists")
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logging.info(f"Setting vm {e.key} status to DELETED")
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e.value["status"] = "DELETED"
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client.put(e.key, json.dumps(e.value))
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return
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_vm = get_vm(running_vms, e.key)
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if _vm:
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logging.info(f"{e.key} already running")
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e.value["status"] = "RUNNING"
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client.put(e.key, json.dumps(e.value))
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return
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# FIXME: There should be better vnc port allocation scheme
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vm = qmp.QEMUMachine(
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"/usr/bin/qemu-system-x86_64",
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test_dir="vm_socklog",
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args=[
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vm_path,
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"-boot", "c", # First Boot Hard drive
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"-m", "1024", # RAM limit
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# Ever growing port number
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"-vnc", f":{vnc_port_pool.pop(0)}", # Allow VNC
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],
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)
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try:
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logging.info(f"Starting {e.key}")
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vm.launch()
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if vm.is_running():
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running_vms.append(VM(e.key, vm))
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e.value["status"] = "RUNNING"
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client.put(e.key, e.value, value_in_json=True)
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else:
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e.value["status"] = "KILLED"
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client.put(e.key, e.value, value_in_json=True)
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return
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except (qmp.QEMUMachineError, TypeError):
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logging.exception(f"Machine Error Occurred on {e.key}")
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e.value["status"] = "KILLED"
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client.put(e.key, e.value, value_in_json=True)
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else:
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logging.info(f"Started Successfully {e.key}")
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@need_running_vm
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def suspend_vm(e):
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vm = get_vm(running_vms, e.key)
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vm.vm.command("stop")
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if vm.vm.command("query-status")["status"] == "paused":
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e.value["status"] = "SUSPENDED"
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client.put(e.key, json.dumps(e.value))
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logging.info(f"Successfully suspended VM {e.key}")
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else:
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logging.info(f"Suspending VM {e.key} failed")
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@need_running_vm
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def resume_vm(e):
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vm = get_vm(running_vms, e.key)
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vm.vm.command("cont")
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if vm.vm.command("query-status")["status"] == "running":
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e.value["status"] = "RUNNING"
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client.put(e.key, json.dumps(e.value))
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logging.info(f"Successfully resumed VM {e.key}")
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else:
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logging.info(f"Resuming VM {e.key} failed")
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@need_running_vm
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def shutdown_vm(e):
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vm = get_vm(running_vms, e.key)
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vm.vm.shutdown()
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if not vm.vm.is_running():
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logging.info(f"VM {e.key} shutdown successfully")
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e.value["status"] = "STOPPED"
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client.put(e.key, json.dumps(e.value))
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running_vms.remove(vm)
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def delete_vm(e):
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#FIXME: Implementation Obseleted after CEPH Integeration
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logging.info(f"Deleting VM {e.key}")
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shutdown_vm(e)
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vm = client.get(e.key, value_in_json=True)
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if vm:
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vm_id = e.key.split('/')[-1]
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vm_owner = e.value['owner']
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vm_path = f"{config('BASE_DIR')}/{vm_owner}/.vm/{vm_id}"
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if os.path.exists(vm_path):
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os.remove(vm_path)
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client.client.delete(e.key)
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logging.info(f"VM {vm.key} deleted")
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else:
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logging.info(f"Cannot delete key {e.key} because it doesn't exists")
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def get_vm(vm_list: list, vm_key) -> Union[VM, None]:
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return next((vm for vm in vm_list if vm.key == vm_key), None)
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def maintenence(e, host):
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# VMs on this Host
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_vms = filter(lambda v: v.value["hostname"] == host.key, client.get_prefix("/v1/vm", value_in_json=True))
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alleged_running_vms = filter(lambda v: v.value["status"] == "RUNNING", _vms)
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# TODO: Delete this. This was intended to start VMs that
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# requested to be started when ucloud-vm is not running.
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# This is no longer needed as we check for pending requests
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# at the start and handle them.
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# should_be_running = filter(lambda v: v.value["status"] == "REQUESTED_START", _vms)
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for vm in alleged_running_vms:
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_vm = get_vm(running_vms, vm.key)
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if (_vm and not _vm.vm.is_running()) or _vm is None:
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logging.debug(f"{_vm} {vm.key}")
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logging.info(f"{vm.key} is not running but is said to be running")
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logging.info(f"Updating {vm.key} status to KILLED")
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vm.value["status"] = "KILLED"
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client.put(vm.key, json.dumps(vm.value))
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# TODO: Delete this. This was intended to start VMs that
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# requested to be started when ucloud-vm is not running.
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# This is no longer needed as we check for pending requests
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# at the start and handle them.
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# for vm in should_be_running:
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# vm_path = f"rbd:uservms/{vm.key.split('/')[-1]}"
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# start_vm(vm_path, e)
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# TODO: Check whether a vm is running on this host that
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# is not supposed to be running on this host
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host.value["status"] = "ALIVE"
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host.value["last_heartbeat"] = datetime.utcnow().isoformat()
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client.put(host.key, json.dumps(host.value))
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logging.info(f"Updated last heartbeat time {host.value['last_heartbeat']}")
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def main():
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argparser = argparse.ArgumentParser()
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argparser.add_argument("hostname", help="Name of this host. e.g /v1/host/1")
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args = argparser.parse_args()
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host = client.get(args.hostname, value_in_json=True)
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if not host:
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print("No Such Host")
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exit(1)
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host.value["status"] = "ALIVE"
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host.value["last_heartbeat"] = datetime.utcnow().isoformat()
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client.put(host.key, host.value, value_in_json=True)
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atexit.register(goodbye, host=host)
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for events_iterator in [client.get_prefix("/v1/vm/"),
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client.watch_prefix("/v1/vm/", timeout=10)]:
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for e in events_iterator:
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# TODO: Should we disable timeout alarm inside
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# event handling code and enable it while going outside
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try:
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e.value = json.loads(e.value)
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except json.JSONDecodeError:
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logging.error(f"Invalid JSON {e.value}")
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continue
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e_status = e.value["status"]
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if e_status == "TIMEOUT":
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logging.info("Timeout")
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maintenence(e, host)
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continue
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e_hostname = e.value["hostname"]
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if hasattr(e.value, "migration_destination"):
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e_migration_destination = e.value["migration_destination"]
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else:
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e_migration_destination = ""
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vm_uuid = e.key.split("/")[-1]
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# If the event is directed toward me or
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# I am destination of a REQUESTED_MIGRATION
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if e_hostname == host.key or\
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e_migration_destination == host.key:
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logging.debug(f"EVENT: {e}")
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if e_status == "SCHEDULED_DEPLOY":
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create_vm(vm_uuid, e)
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elif e_status == "REQUESTED_SUSPEND":
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suspend_vm(e)
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elif e_status == "REQUESTED_RESUME":
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resume_vm(e)
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elif e_status == "REQUESTED_START":
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vm_path = f"rbd:uservms/{vm_uuid}"
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start_vm(vm_path, e)
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elif e_status == "REQUESTED_SHUTDOWN":
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shutdown_vm(e)
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elif e_status == "DELETED":
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delete_vm(e)
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# elif e_status == "REQUESTED_MIGRATION":
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# if e.value["migration_destination"]
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logging.info(f"Running VMs {running_vms}")
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main()
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