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queue_manager.py
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queue_manager.py
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import asyncio
from contextlib import asynccontextmanager
from enum import Enum, auto
from typing import Any, Dict, List, Optional, Tuple, Union
from aio_pika import Queue, RobustChannel, Exchange, RobustConnection
from aio_pika.channel import Channel
from aio_pika.exceptions import ChannelClosed
from aio_pika.exchange import ExchangeType
from aio_pika.message import Message
from aiocouch.database import Database, NotFoundError
from metricq import get_logger
from .config_parser import ConfigParser
logger = get_logger(__name__)
Seconds = Union[int, float]
HreqQueue = Queue
DataQueue = Queue
DataExchange = Exchange
HistoryExchange = Exchange
Metric = str
class QueueRole(Enum):
Data = auto()
Hreq = auto()
Hrsp = auto()
class SinkUnbindFailed(RuntimeError):
pass
class DataQueueNotFound(RuntimeError):
pass
class QueueManager:
def __init__(
self,
*,
data_connection: RobustConnection,
config_db: Database,
channel: Optional[RobustChannel] = None,
):
self.data_connection = data_connection
self.config = config_db
self._channel = channel
self._data_exchange: Optional[DataExchange] = None
self._history_exchange: Optional[HistoryExchange] = None
async def close(self):
if self._channel is not None:
logger.debug(
"Closing channel on data connection {!r}", self.data_connection
)
await self._channel.close()
self._channel = None
logger.debug("Closing data connection {!r}", self.data_connection)
await self.data_connection.close()
async def ensure_open_channel(self):
logger.debug("Ensuring an open channel on {!r}", self.data_connection)
await self.channel()
async def channel(self) -> RobustChannel:
if self._channel is None:
self._channel = await self.data_connection.channel()
assert self._channel is not None
return self._channel
async def declare_queue(
self,
name: str,
arguments: Dict[str, Any],
auto_delete: bool = False,
durable: bool = False,
) -> Queue:
channel = await self.channel()
return await channel.declare_queue(
name=name,
arguments=arguments,
auto_delete=auto_delete,
durable=durable,
robust=False,
)
async def _declare_exchange(self, name: str) -> Exchange:
logger.info("Declaring exchange {!r}", name)
channel = await self.channel()
return await channel.declare_exchange(
name=name, type=ExchangeType.TOPIC, durable=True
)
async def declare_exchanges(
self,
data_exchange_name: str = "metricq.data",
history_exchange_name: str = "metricq.history",
) -> Tuple[DataExchange, HistoryExchange]:
logger.info("Declaring data and history exchanges")
if self._data_exchange is None:
self._data_exchange = await self._declare_exchange(data_exchange_name)
if self._history_exchange is None:
self._history_exchange = await self._declare_exchange(history_exchange_name)
return (self._data_exchange, self._history_exchange)
@property
def data_exchange(self) -> DataExchange:
if self._data_exchange is None:
raise RuntimeError("Data exchange has not been declared")
return self._data_exchange
@property
def history_exchange(self) -> HistoryExchange:
if self._history_exchange is None:
raise RuntimeError("History exchange has not been declared")
return self._history_exchange
async def read_config(
self, client_token: str, role: str, allow_missing: bool = False
) -> ConfigParser:
config = {}
try:
config = (await self.config[client_token]).data
except NotFoundError:
if allow_missing:
pass
else:
raise
return ConfigParser(config=config, role=role, client_token=client_token)
@asynccontextmanager
async def fetch_data_queue(self, queue_name: str):
"""Opens a new channel to reliably fetch an existing data queue.
If the queue does not exist, this raises :class:`.DataQueueNotFound`.
"""
# Open a new (temporary) channel on the data connection.
# If fetching the queue fails, the channel will be closed by the remote,
# and `get_queue` raises `ChannelClosed`.
channel: Channel = await self.data_connection.channel()
try:
queue = await channel.get_queue(queue_name)
except ChannelClosed as e:
raise DataQueueNotFound(f"Failed to fetch data queue {queue_name!r}") from e
try:
yield queue
finally:
# Close the temporary channel in a background task
async def close():
await channel.close()
logger.debug("Closed temporary channel {!r}", channel)
asyncio.create_task(close())
async def declare_sink_data_queue(
self,
client_token: str,
queue_name: Optional[str],
expires: Optional[Seconds] = None,
bindinds: Optional[List[Metric]] = None,
) -> DataQueue:
if not client_token.startswith("sink-"):
logger.warning('Sink token {!r} should start with "sink-"', client_token)
config = await self.read_config(client_token, role="data", allow_missing=True)
queue_name = config.queue_name(unique=True, default=queue_name)
arguments = dict(config.classic_arguments())
if isinstance(expires, (int, float)) and expires > 0:
arguments["x-expires"] = int(1000 * expires)
elif expires is None:
pass
else:
logger.warning(
"Invalid message expiry requested from {!r}: {!r} is not a positive number of seconds",
client_token,
expires,
)
channel = await self.channel()
data_queue = await channel.declare_queue(
queue_name,
auto_delete=True,
arguments=arguments,
)
if bindinds:
await self._bind_metrics(
metrics=bindinds,
queue=data_queue,
exchange=self.data_exchange,
)
return data_queue
async def _bind_metrics(
self,
metrics: List[str],
queue: Queue,
exchange: Exchange,
):
logger.info(
"Binding metrics to queue {!r} on exchange {!r}",
queue,
exchange.name,
)
bind_results = await asyncio.gather(
*(queue.bind(exchange=exchange, routing_key=metric) for metric in metrics)
)
logger.info(
"Successfully bound {}/{} metric(s) to queue {!r}",
len(bind_results),
len(metrics),
queue,
)
async def sink_unbind_metrics(
self,
client_token: str,
queue_name: str,
metrics: List[str],
publish_end_message: bool,
):
try:
async with self.fetch_data_queue(queue_name) as queue:
logger.debug(
"Unbinding {} metric(s) from data queue {!r} for client {!r}",
len(metrics),
queue_name,
client_token,
)
await asyncio.gather(
*(
queue.unbind(exchange=self.data_exchange, routing_key=metric)
for metric in metrics
)
)
if publish_end_message:
await self.publish_end_message(queue_name=queue_name)
except DataQueueNotFound as e:
err = SinkUnbindFailed(f"Data queue {queue_name!r} does not exist")
logger.error(
"Failed to unbind {} metric(s) for client {!r}: {} (cause: {})",
len(metrics),
queue_name,
client_token,
err,
e,
)
raise err from e
except ChannelClosed as e:
raise SinkUnbindFailed(
f"Channel closed while unbinding metrics from queue {queue_name!r} of client {client_token!r}"
) from e
async def publish_end_message(self, queue_name: str):
await self.channel.default_exchange.publish(
Message(body=b"", type="end"), routing_key=queue_name
)
async def sink_delete_data_queue(self, queue_name: str):
async with self.fetch_data_queue(queue_name) as queue:
await queue.delete(if_unused=False, if_empty=False)
async def declare_history_response_queue(self, history_token: str):
config = await self.read_config(history_token, role="hrsp", allow_missing=True)
queue_name = config.queue_name(unique=False)
arguments = dict(config.classic_arguments())
return await self.declare_queue(
queue_name,
arguments=arguments,
auto_delete=True,
)
async def declare_durable_queue(self, config: ConfigParser) -> DataQueue:
queue_name = config.queue_name(unique=False)
arguments = dict(config.arguments())
return await self.declare_queue(
queue_name,
arguments=arguments,
durable=True,
)
async def declare_transformer_data_queue(
self,
transformer_token: str,
bindinds: Optional[List[Metric]] = None,
) -> DataQueue:
data_queue = await self.declare_durable_queue(
config=await self.read_config(client_token=transformer_token, role="data")
)
if bindinds:
# TODO Also unbind other metrics that are no longer relevant
await self._bind_metrics(
metrics=bindinds, queue=data_queue, exchange=self.data_exchange
)
return data_queue
async def declare_db_queues(
self,
db_token: str,
data_bindings: Optional[List[Metric]] = None,
history_bindings: Optional[List[Metric]] = None,
) -> Tuple[DataQueue, HreqQueue]:
data_config = await self.read_config(client_token=db_token, role="data")
hreq_config = data_config.replace(role="hreq")
data_queue = await self.declare_durable_queue(config=data_config)
hreq_queue = await self.declare_durable_queue(config=hreq_config)
bind_tasks = []
if data_bindings is not None:
logger.info("Binding metrics to data queue for database {!r}", db_token)
data_bindings_task = self._bind_metrics(
metrics=data_bindings,
queue=data_queue,
exchange=self.data_exchange,
)
bind_tasks.append(bind_tasks)
if history_bindings is not None:
logger.info("Binding metrics to history queue for database {!r}", db_token)
history_bindings_task = self._bind_metrics(
metrics=history_bindings,
queue=hreq_queue,
exchange=self.history_exchange,
)
bind_tasks.append(bind_tasks)
if bind_tasks:
await asyncio.gather(*bind_tasks)
return (data_queue, hreq_queue)