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committer_impl.py
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committer_impl.py
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import asyncio
from typing import Optional, List, Iterable
from absl import logging
from google.cloud.pubsublite.internal.wait_ignore_cancelled import wait_ignore_errors
from google.cloud.pubsublite.internal.wire.committer import Committer
from google.cloud.pubsublite.internal.wire.retrying_connection import (
RetryingConnection,
ConnectionFactory,
)
from google.api_core.exceptions import FailedPrecondition, GoogleAPICallError
from google.cloud.pubsublite.internal.wire.connection_reinitializer import (
ConnectionReinitializer,
)
from google.cloud.pubsublite.internal.wire.connection import Connection
from google.cloud.pubsublite.internal.wire.serial_batcher import (
SerialBatcher,
BatchTester,
)
from google.cloud.pubsublite_v1 import Cursor
from google.cloud.pubsublite_v1.types import (
StreamingCommitCursorRequest,
StreamingCommitCursorResponse,
InitialCommitCursorRequest,
)
from google.cloud.pubsublite.internal.wire.work_item import WorkItem
class CommitterImpl(
Committer,
ConnectionReinitializer[
StreamingCommitCursorRequest, StreamingCommitCursorResponse
],
BatchTester[Cursor],
):
_initial: InitialCommitCursorRequest
_flush_seconds: float
_connection: RetryingConnection[
StreamingCommitCursorRequest, StreamingCommitCursorResponse
]
_batcher: SerialBatcher[Cursor, None]
_outstanding_commits: List[List[WorkItem[Cursor, None]]]
_receiver: Optional[asyncio.Future]
_flusher: Optional[asyncio.Future]
def __init__(
self,
initial: InitialCommitCursorRequest,
flush_seconds: float,
factory: ConnectionFactory[
StreamingCommitCursorRequest, StreamingCommitCursorResponse
],
):
self._initial = initial
self._flush_seconds = flush_seconds
self._connection = RetryingConnection(factory, self)
self._batcher = SerialBatcher(self)
self._outstanding_commits = []
self._receiver = None
self._flusher = None
async def __aenter__(self):
await self._connection.__aenter__()
return self
def _start_loopers(self):
assert self._receiver is None
assert self._flusher is None
self._receiver = asyncio.ensure_future(self._receive_loop())
self._flusher = asyncio.ensure_future(self._flush_loop())
async def _stop_loopers(self):
if self._receiver:
self._receiver.cancel()
await wait_ignore_errors(self._receiver)
self._receiver = None
if self._flusher:
self._flusher.cancel()
await wait_ignore_errors(self._flusher)
self._flusher = None
def _handle_response(self, response: StreamingCommitCursorResponse):
if "commit" not in response:
self._connection.fail(
FailedPrecondition(
"Received an invalid subsequent response on the commit stream."
)
)
if response.commit.acknowledged_commits > len(self._outstanding_commits):
self._connection.fail(
FailedPrecondition(
"Received a commit response on the stream with no outstanding commits."
)
)
for _ in range(response.commit.acknowledged_commits):
batch = self._outstanding_commits.pop(0)
for item in batch:
item.response_future.set_result(None)
async def _receive_loop(self):
while True:
response = await self._connection.read()
self._handle_response(response)
async def _flush_loop(self):
while True:
await asyncio.sleep(self._flush_seconds)
await self._flush()
async def __aexit__(self, exc_type, exc_val, exc_tb):
await self._stop_loopers()
if self._connection.error():
self._fail_if_retrying_failed()
else:
await self._flush()
await self._connection.__aexit__(exc_type, exc_val, exc_tb)
def _fail_if_retrying_failed(self):
if self._connection.error():
for batch in self._outstanding_commits:
for item in batch:
item.response_future.set_exception(self._connection.error())
async def _flush(self):
batch = self._batcher.flush()
if not batch:
return
self._outstanding_commits.append(batch)
req = StreamingCommitCursorRequest()
req.commit.cursor = batch[-1].request
try:
await self._connection.write(req)
except GoogleAPICallError as e:
logging.debug(f"Failed commit on stream: {e}")
self._fail_if_retrying_failed()
async def commit(self, cursor: Cursor) -> None:
future = self._batcher.add(cursor)
if self._batcher.should_flush():
# always returns false currently, here in case this changes in the future.
await self._flush()
await future
async def reinitialize(
self,
connection: Connection[
StreamingCommitCursorRequest, StreamingCommitCursorResponse
],
):
await self._stop_loopers()
await connection.write(StreamingCommitCursorRequest(initial=self._initial))
response = await connection.read()
if "initial" not in response:
self._connection.fail(
FailedPrecondition(
"Received an invalid initial response on the publish stream."
)
)
if self._outstanding_commits:
# Roll up outstanding commits
rollup: List[WorkItem[Cursor, None]] = []
for batch in self._outstanding_commits:
for item in batch:
rollup.append(item)
self._outstanding_commits = [rollup]
req = StreamingCommitCursorRequest()
req.commit.cursor = rollup[-1].request
await connection.write(req)
self._start_loopers()
def test(self, requests: Iterable[Cursor]) -> bool:
# There is no bound on the number of outstanding cursors.
return False