Sergey Antropoff
206 lines
8.7 KiB
Python
206 lines
8.7 KiB
Python
"""Worker semantics for asynchronous QEMU transitions."""
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from __future__ import annotations
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import json
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import uuid
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from collections.abc import Mapping
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from typing import Any, cast
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from app.simulation.clock import Clock
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from app.simulation.transitions import VmState, plan_transition
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from app.tasks.repository import Task, TaskRepository
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from app.tasks.worker import TaskHandler
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def qemu_handler(repository: TaskRepository, clock: Clock) -> TaskHandler:
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async def execute(task: Task) -> dict[str, Any]:
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operation = task.task_type.removeprefix("qemu-")
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if operation == "create":
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return await _create(repository, task)
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resource_id = uuid.UUID(str(task.payload["resource_id"]))
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if operation == "update":
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return await _update(repository, task, resource_id)
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if operation == "delete":
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return await _delete(repository, task, resource_id)
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if operation.startswith("snapshot-"):
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return await _snapshot(
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repository, task, resource_id, operation.removeprefix("snapshot-")
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)
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async with repository.pool.acquire() as connection:
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row = await connection.fetchrow("SELECT state FROM resources WHERE id=$1", resource_id)
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if row is None:
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raise ValueError("resource disappeared")
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raw = row["state"]
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state = json.loads(raw) if isinstance(raw, str) else dict(raw)
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transition = plan_transition(VmState(str(state["status"])), operation)
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state["status"] = transition.intermediate
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await connection.execute(
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"UPDATE resources SET state=$2::jsonb WHERE id=$1",
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resource_id,
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json.dumps(state),
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)
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await repository.append_log(task.id, f"VM {operation} started")
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await clock.sleep(1.0)
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async with repository.pool.acquire() as connection:
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state["status"] = transition.after
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await connection.execute(
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"UPDATE resources SET state=$2::jsonb WHERE id=$1",
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resource_id,
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json.dumps(state),
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)
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await repository.append_log(task.id, f"VM {operation} completed")
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return {"status": str(transition.after)}
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return execute
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async def _create(repository: TaskRepository, task: Task) -> dict[str, Any]:
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node, vmid = str(task.payload["node"]), int(task.payload["vmid"])
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config = dict(task.payload.get("config", {}))
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resource_id = uuid.uuid4()
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state = {"status": "stopped", **config}
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async with repository.pool.acquire() as connection:
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async with connection.transaction():
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node_row = await connection.fetchrow(
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"SELECT id, cluster_id FROM nodes WHERE name=$1", node
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)
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if node_row is None:
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raise ValueError("node disappeared")
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await connection.execute(
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"""INSERT INTO resources(
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id, node_id, cluster_id, kind, external_id, state, metadata
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) VALUES($1, $2, $3, 'qemu', $4, $5::jsonb, '{}'::jsonb)""",
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resource_id,
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node_row["id"],
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node_row["cluster_id"],
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str(vmid),
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json.dumps(state, sort_keys=True),
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)
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await connection.execute(
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"""INSERT INTO virtual_machines(resource_id, cluster_id, vmid, config)
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VALUES($1, $2, $3, $4::jsonb)""",
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resource_id,
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node_row["cluster_id"],
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vmid,
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json.dumps(config, sort_keys=True),
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)
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await repository.append_log(task.id, f"VM {vmid} created")
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return {"vmid": vmid, "status": "stopped"}
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async def _update(repository: TaskRepository, task: Task, resource_id: uuid.UUID) -> dict[str, Any]:
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changes = dict(task.payload.get("changes", {}))
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delete_keys = tuple(str(task.payload.get("delete", "")).split(","))
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async with repository.pool.acquire() as connection:
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async with connection.transaction():
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row = await connection.fetchrow(
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"""SELECT r.state, v.config FROM resources r
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JOIN virtual_machines v ON v.resource_id=r.id WHERE r.id=$1""",
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resource_id,
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)
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if row is None:
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raise ValueError("resource disappeared")
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state = _object(row["state"])
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config = _object(row["config"])
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config.update(changes)
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for key in delete_keys:
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if key:
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config.pop(key, None)
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state.pop(key, None)
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state.update(changes)
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await connection.execute(
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"""UPDATE resources SET state=$2::jsonb, version=version+1,
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updated_at=now() WHERE id=$1""",
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resource_id,
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json.dumps(state, sort_keys=True),
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)
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await connection.execute(
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"UPDATE virtual_machines SET config=$2::jsonb WHERE resource_id=$1",
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resource_id,
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json.dumps(config, sort_keys=True),
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)
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await repository.append_log(task.id, "VM configuration updated")
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return {"updated": sorted(changes), "deleted": sorted(key for key in delete_keys if key)}
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async def _delete(repository: TaskRepository, task: Task, resource_id: uuid.UUID) -> dict[str, Any]:
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async with repository.pool.acquire() as connection:
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status = await connection.execute("DELETE FROM resources WHERE id=$1", resource_id)
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if status != "DELETE 1":
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raise ValueError("resource disappeared")
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await repository.append_log(task.id, "VM deleted")
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return {"deleted": True}
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async def _snapshot(
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repository: TaskRepository,
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task: Task,
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resource_id: uuid.UUID,
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operation: str,
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) -> dict[str, Any]:
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name = str(task.payload["snapname"])
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async with repository.pool.acquire() as connection:
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async with connection.transaction():
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if operation == "create":
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row = await connection.fetchrow(
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"""SELECT r.state, v.config FROM resources r
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JOIN virtual_machines v ON v.resource_id=r.id WHERE r.id=$1""",
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resource_id,
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)
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if row is None:
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raise ValueError("resource disappeared")
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captured = {
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"resource_state": _object(row["state"]),
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"config": _object(row["config"]),
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"vmstate": bool(task.payload.get("vmstate", False)),
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}
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await connection.execute(
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"""INSERT INTO snapshots(id, resource_id, name, description, state)
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VALUES($1, $2, $3, $4, $5::jsonb)""",
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uuid.uuid4(),
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resource_id,
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name,
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str(task.payload.get("description", "")),
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json.dumps(captured, sort_keys=True),
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)
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elif operation == "delete":
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status = await connection.execute(
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"DELETE FROM snapshots WHERE resource_id=$1 AND name=$2",
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resource_id,
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name,
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)
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if status != "DELETE 1":
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raise ValueError("snapshot disappeared")
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elif operation == "rollback":
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row = await connection.fetchrow(
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"SELECT state FROM snapshots WHERE resource_id=$1 AND name=$2",
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resource_id,
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name,
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)
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if row is None:
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raise ValueError("snapshot disappeared")
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captured = _object(row["state"])
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state = dict(cast(Mapping[str, Any], captured["resource_state"]))
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if bool(task.payload.get("start", False)):
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state["status"] = "running"
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await connection.execute(
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"""UPDATE resources SET state=$2::jsonb, version=version+1,
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updated_at=now() WHERE id=$1""",
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resource_id,
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json.dumps(state, sort_keys=True),
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)
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await connection.execute(
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"UPDATE virtual_machines SET config=$2::jsonb WHERE resource_id=$1",
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resource_id,
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json.dumps(captured["config"], sort_keys=True),
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)
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else:
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raise ValueError(f"unsupported snapshot operation: {operation}")
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await repository.append_log(task.id, f"snapshot {name} {operation} completed")
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return {"snapshot": name, "operation": operation}
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def _object(value: object) -> dict[str, Any]:
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return json.loads(value) if isinstance(value, str) else dict(cast(Mapping[str, Any], value))
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