259 lines
8.9 KiB
Python
Executable File
259 lines
8.9 KiB
Python
Executable File
# 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 subprocess
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import traceback
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import errno
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import qmp
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import tempfile
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import bitmath
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import time
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from ucloud_common.vm import VMStatus, VMEntry
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from config import (vm_pool, request_pool, etcd_client, logging, running_vms)
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from typing import Union
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from functools import wraps
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from dataclasses import dataclass
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from ucloud_common.request import RequestEntry, RequestType
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import sshtunnel
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from decouple import config
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from os.path import join
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from ucloud_common.helpers import get_ipv4_address
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@dataclass
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class VM:
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key: str
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handle: qmp.QEMUMachine
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vnc_socket_file: tempfile.NamedTemporaryFile
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def __repr__(self):
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return f"VM({self.key})"
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def get_start_command_args(vm_entry, vnc_sock_filename: str, migration=False, migration_port=4444):
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vm_memory = int(bitmath.Byte(int(vm_entry.specs["ram"])).to_MB())
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vm_cpus = int(vm_entry.specs["cpu"])
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vm_uuid = vm_entry.uuid
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threads_per_core = 1
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command = (f"-drive file=rbd:uservms/{vm_uuid},format=raw,if=virtio,cache=none"
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f" -device virtio-rng-pci -vnc unix:{vnc_sock_filename}"
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f" -m {vm_memory} -smp cores={vm_cpus},threads={threads_per_core}"
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f" -name {vm_uuid}")
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if migration:
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command += f" -incoming tcp:0:{migration_port}"
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return command.split(" ")
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def create_vm_object(vm_entry, migration=False, migration_port=4444):
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# NOTE: If migration suddenly stop working, having different
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# VNC unix filename on source and destination host can
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# be a possible cause of it.
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# REQUIREMENT: Use Unix Socket instead of TCP Port for VNC
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vnc_sock_file = tempfile.NamedTemporaryFile()
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qemu_machine = qmp.QEMUMachine("/usr/bin/qemu-system-x86_64",
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args=get_start_command_args(vm_entry,
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vnc_sock_file.name,
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migration=migration,
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migration_port=migration_port
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)
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)
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return VM(vm_entry.key, qemu_machine, vnc_sock_file)
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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 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.handle.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(
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f"{func.__name__} failed - VM {e.key} - Unknown Error"
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)
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return func(e)
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else:
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logging.info(
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f"{func.__name__} failed because VM {e.key} is not running"
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)
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return
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return wrapper
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def create(vm_entry: VMEntry):
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vm_hdd = int(bitmath.Byte(int(vm_entry.specs["hdd"])).to_MB())
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_command_to_create = f"rbd clone images/{vm_entry.image_uuid}@protected uservms/{vm_entry.uuid}"
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_command_to_extend = f"rbd resize uservms/{vm_entry.uuid} --size {vm_hdd}"
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try:
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subprocess.check_call(_command_to_create.split(" "))
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except subprocess.CalledProcessError as e:
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if e.returncode == errno.EEXIST:
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logging.debug(f"Image for vm {vm_entry.uuid} exists")
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# File Already exists. No Problem Continue
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return
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else:
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# This exception catches all other exceptions
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# i.e FileNotFound (BaseImage), pool Does Not Exists etc.
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logging.exception(f"Can't clone image - {e}")
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else:
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# TODO: Check whether the below suprocess.check_call
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# is executed successfully
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subprocess.check_call(_command_to_extend.split(" "))
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logging.info("New VM Created")
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def start(vm_entry: VMEntry):
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_vm = get_vm(running_vms, vm_entry.key)
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# VM already running. No need to proceed further.
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if _vm:
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logging.info(f"VM {vm_entry.uuid} already running")
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return
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else:
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create(vm_entry)
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logging.info(f"Starting {vm_entry.key}")
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vm = create_vm_object(vm_entry)
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try:
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vm.handle.launch()
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except (qmp.QEMUMachineError, TypeError, Exception):
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vm_entry.declare_killed()
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vm_entry.add_log(f"Machine Error occurred - {traceback.format_exc()}")
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vm_pool.put(vm_entry)
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else:
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running_vms.append(vm)
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vm_entry.status = VMStatus.running
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vm_entry.add_log("Started successfully")
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vm_pool.put(vm_entry)
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@need_running_vm
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def stop(vm_entry):
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vm = get_vm(running_vms, vm_entry.key)
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vm.handle.shutdown()
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if not vm.handle.is_running():
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vm_entry.add_log("Shutdown successfully")
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vm_entry.declare_stopped()
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vm_pool.put(vm_entry)
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running_vms.remove(vm)
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def delete(vm_entry):
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logging.info(f"Deleting VM {vm_entry}")
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stop(vm_entry)
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path_without_protocol = vm_entry.path[vm_entry.path.find(":") + 1:]
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try:
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rc = subprocess.call(f"rbd rm {path_without_protocol}".split(" "))
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except FileNotFoundError as e:
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logging.exception(e)
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except Exception as e:
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logging.exception(f"Unknown error occurred - {e}")
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else:
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if rc == 0:
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etcd_client.client.delete(vm_entry.key)
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else:
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logging.info("Some unknown problem occur while deleting vm file")
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def transfer(request_event):
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# This function would run on source host i.e host on which the vm
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# is running initially. This host would be responsible for transferring
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# vm state to destination host.
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_host, _port = request_event.parameters["host"], request_event.parameters["port"]
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_uuid = request_event.uuid
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_destination = request_event.destination_host_key
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vm = get_vm(running_vms, join("/v1/vm", _uuid))
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if vm:
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tunnel = sshtunnel.SSHTunnelForwarder(
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(_host, 22),
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ssh_username=config("ssh_username"),
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ssh_pkey=config("ssh_pkey"),
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ssh_private_key_password=config("ssh_private_key_password"),
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remote_bind_address=('127.0.0.1', _port),
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)
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try:
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tunnel.start()
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except sshtunnel.BaseSSHTunnelForwarderError:
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logging.exception(f"Couldn't establish connection to ({_host}, 22)")
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else:
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vm.handle.command("migrate", uri=f"tcp:{_host}:{tunnel.local_bind_port}")
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status = vm.handle.command("query-migrate")["status"]
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while status not in ["failed", "completed"]:
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time.sleep(2)
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status = vm.handle.command("query-migrate")["status"]
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with vm_pool.get_put(request_event.uuid) as source_vm:
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if status == "failed":
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source_vm.add_log("Migration Failed")
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elif status == "completed":
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# If VM is successfully migrated then shutdown the VM
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# on this host and update hostname to destination host key
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source_vm.add_log("Successfully migrated")
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source_vm.hostname = _destination
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running_vms.remove(vm)
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vm.handle.shutdown()
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source_vm.in_migration = False # VM transfer finished
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finally:
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tunnel.close()
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def init_migration(vm_entry, destination_host_key):
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# This function would run on destination host i.e host on which the vm
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# would be transferred after migration.
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# This host would be responsible for starting VM that would receive
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# state of VM running on source host.
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_vm = get_vm(running_vms, vm_entry.key)
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if _vm:
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# VM already running. No need to proceed further.
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logging.info(f"{_vm.key} Already running")
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return
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logging.info(f"Starting {vm_entry.key}")
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vm = create_vm_object(vm_entry, migration=True, migration_port=4444)
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try:
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vm.handle.launch()
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except Exception as e:
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# We don't care whether MachineError or any other error occurred
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logging.exception(e)
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vm.handle.shutdown()
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else:
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vm_entry.in_migration = True
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vm_pool.put(vm_entry)
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running_vms.append(vm)
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r = RequestEntry.from_scratch(type=RequestType.TransferVM,
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hostname=vm_entry.hostname,
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parameters={
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"host": get_ipv4_address(),
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"port": 4444,
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},
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uuid=vm_entry.uuid,
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destination_host_key=destination_host_key
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)
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request_pool.put(r)
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