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Þ'¯°ÌME[YéïĵÂCå½ Ué©Áû'Ê9%eÔðNU”ë‘ÌsD3/®+UI˜9h.WC”빓$#:pz:YÓ ¿xž* ³$Í +$kñAŠ‹†¢ Uê>¸)_š¬÷©ßAÂÔb9ÇU ¯¾á•9¯ÏÏ÷O÷¼¼Fähal1‰3Ì[Ïr•´UCksNÐ] R‘¸¥H+§Šé†c©vÖÞ0iÓ76s†î!§=ß ¼~Ô'°Ãmäoäš³ªøi1úÉ)³yV8 CLÄØÁ‘WYïi€H6ÖÑiámø^ÈY´°Ñ7¥Û*—Ñ©L«Qƒï—Ùrÿ ›£Ð*š¸ˆL©ˆ$ˆ ÷¾D§9È®«qbqC)–ˆïv´çñsÑVT­Ø, <àïºÀO«Jý·õ àfPìð .wFšir´þ’2_Y *Æ€x\« ì€9š@ Ž|F⇥ˆkZ@hÖÄ0t¿-<“‹qµ¾*ZL¤Ú)&BJpÓF5=$„at*Zš$’ÑtdûÝRI1 2Ž‰$€$I$#‰SÞ’Hë¬ï;Á$¡t$’`<(ñÇt)$‡Ð.Êf¢X’Kt=Éé$‚ˆªè¢oÝëòI%Rgcª÷ŠyI%¡‰ÿ !ñ)´õ $¤ Ô’IIGÿÙimport asyncio import functools from ..abc import AbcPool from ..errors import ( RedisError, PipelineError, MultiExecError, ConnectionClosedError, ) from ..util import ( wait_ok, _set_exception, get_event_loop, ) class TransactionsCommandsMixin: """Transaction commands mixin. For commands details see: http://redis.io/commands/#transactions Transactions HOWTO: >>> tr = redis.multi_exec() >>> result_future1 = tr.incr('foo') >>> result_future2 = tr.incr('bar') >>> try: ... result = await tr.execute() ... except MultiExecError: ... pass # check what happened >>> result1 = await result_future1 >>> result2 = await result_future2 >>> assert result == [result1, result2] """ def unwatch(self): """Forget about all watched keys.""" fut = self._pool_or_conn.execute(b'UNWATCH') return wait_ok(fut) def watch(self, key, *keys): """Watch the given keys to determine execution of the MULTI/EXEC block. """ # FIXME: we can send watch through one connection and then issue # 'multi/exec' command through other. # Possible fix: # "Remember" a connection that was used for 'watch' command # and then send 'multi / exec / discard' through it. fut = self._pool_or_conn.execute(b'WATCH', key, *keys) return wait_ok(fut) def multi_exec(self): """Returns MULTI/EXEC pipeline wrapper. Usage: >>> tr = redis.multi_exec() >>> fut1 = tr.incr('foo') # NO `await` as it will block forever! >>> fut2 = tr.incr('bar') >>> result = await tr.execute() >>> result [1, 1] >>> await asyncio.gather(fut1, fut2) [1, 1] """ return MultiExec(self._pool_or_conn, self.__class__) def pipeline(self): """Returns :class:`Pipeline` object to execute bulk of commands. It is provided for convenience. Commands can be pipelined without it. Example: >>> pipe = redis.pipeline() >>> fut1 = pipe.incr('foo') # NO `await` as it will block forever! >>> fut2 = pipe.incr('bar') >>> result = await pipe.execute() >>> result [1, 1] >>> await asyncio.gather(fut1, fut2) [1, 1] >>> # >>> # The same can be done without pipeline: >>> # >>> fut1 = redis.incr('foo') # the 'INCRY foo' command already sent >>> fut2 = redis.incr('bar') >>> await asyncio.gather(fut1, fut2) [2, 2] """ return Pipeline(self._pool_or_conn, self.__class__) class _RedisBuffer: def __init__(self, pipeline, *, loop=None): # TODO: deprecation note # if loop is None: # loop = asyncio.get_event_loop() self._pipeline = pipeline def execute(self, cmd, *args, **kw): fut = get_event_loop().create_future() self._pipeline.append((fut, cmd, args, kw)) return fut # TODO: add here or remove in connection methods like `select`, `auth` etc class Pipeline: """Commands pipeline. Usage: >>> pipe = redis.pipeline() >>> fut1 = pipe.incr('foo') >>> fut2 = pipe.incr('bar') >>> await pipe.execute() [1, 1] >>> await fut1 1 >>> await fut2 1 """ error_class = PipelineError def __init__(self, pool_or_connection, commands_factory=lambda conn: conn, *, loop=None): # TODO: deprecation note # if loop is None: # loop = asyncio.get_event_loop() self._pool_or_conn = pool_or_connection self._pipeline = [] self._results = [] self._buffer = _RedisBuffer(self._pipeline) self._redis = commands_factory(self._buffer) self._done = False def __getattr__(self, name): assert not self._done, "Pipeline already executed. Create new one." attr = getattr(self._redis, name) if callable(attr): @functools.wraps(attr) def wrapper(*args, **kw): try: task = asyncio.ensure_future(attr(*args, **kw)) except Exception as exc: task = get_event_loop().create_future() task.set_exception(exc) self._results.append(task) return task return wrapper return attr async def execute(self, *, return_exceptions=False): """Execute all buffered commands. Any exception that is raised by any command is caught and raised later when processing results. Exceptions can also be returned in result if `return_exceptions` flag is set to True. """ assert not self._done, "Pipeline already executed. Create new one." self._done = True if self._pipeline: if isinstance(self._pool_or_conn, AbcPool): async with self._pool_or_conn.get() as conn: return await self._do_execute( conn, return_exceptions=return_exceptions) else: return await self._do_execute( self._pool_or_conn, return_exceptions=return_exceptions) else: return await self._gather_result(return_exceptions) async def _do_execute(self, conn, *, return_exceptions=False): await asyncio.gather(*self._send_pipeline(conn), return_exceptions=True) return await self._gather_result(return_exceptions) async def _gather_result(self, return_exceptions): errors = [] results = [] for fut in self._results: try: res = await fut results.append(res) except Exception as exc: errors.append(exc) results.append(exc) if errors and not return_exceptions: raise self.error_class(errors) return results def _send_pipeline(self, conn): with conn._buffered(): for fut, cmd, args, kw in self._pipeline: try: result_fut = conn.execute(cmd, *args, **kw) result_fut.add_done_callback( functools.partial(self._check_result, waiter=fut)) except Exception as exc: fut.set_exception(exc) else: yield result_fut def _check_result(self, fut, waiter): if fut.cancelled(): waiter.cancel() elif fut.exception(): waiter.set_exception(fut.exception()) else: waiter.set_result(fut.result()) class MultiExec(Pipeline): """Multi/Exec pipeline wrapper. Usage: >>> tr = redis.multi_exec() >>> f1 = tr.incr('foo') >>> f2 = tr.incr('bar') >>> # A) >>> await tr.execute() >>> res1 = await f1 >>> res2 = await f2 >>> # or B) >>> res1, res2 = await tr.execute() and ofcourse try/except: >>> tr = redis.multi_exec() >>> f1 = tr.incr('1') # won't raise any exception (why?) >>> try: ... res = await tr.execute() ... except RedisError: ... pass >>> assert f1.done() >>> assert f1.result() is res >>> tr = redis.multi_exec() >>> wait_ok_coro = tr.mset('1') >>> try: ... ok1 = await tr.execute() ... except RedisError: ... pass # handle it >>> ok2 = await wait_ok_coro >>> # for this to work `wait_ok_coro` must be wrapped in Future """ error_class = MultiExecError async def _do_execute(self, conn, *, return_exceptions=False): self._waiters = waiters = [] with conn._buffered(): multi = conn.execute('MULTI') coros = list(self._send_pipeline(conn)) exec_ = conn.execute('EXEC') gather = asyncio.gather(multi, *coros, return_exceptions=True) last_error = None try: await asyncio.shield(gather) except asyncio.CancelledError: await gather except Exception as err: last_error = err raise finally: if conn.closed: if last_error is None: last_error = ConnectionClosedError() for fut in waiters: _set_exception(fut, last_error) # fut.cancel() for fut in self._results: if not fut.done(): fut.set_exception(last_error) # fut.cancel() else: try: results = await exec_ except RedisError as err: for fut in waiters: fut.set_exception(err) else: assert len(results) == len(waiters), ( "Results does not match waiters", results, waiters) self._resolve_waiters(results, return_exceptions) return (await self._gather_result(return_exceptions)) def _resolve_waiters(self, results, return_exceptions): errors = [] for val, fut in zip(results, self._waiters): if isinstance(val, RedisError): fut.set_exception(val) errors.append(val) else: fut.set_result(val) if errors and not return_exceptions: raise MultiExecError(errors) def _check_result(self, fut, waiter): assert waiter not in self._waiters, (fut, waiter, self._waiters) assert not waiter.done(), waiter if fut.cancelled(): # await gather was cancelled waiter.cancel() elif fut.exception(): # server replied with error waiter.set_exception(fut.exception()) elif fut.result() in {b'QUEUED', 'QUEUED'}: # got result, it should be QUEUED self._waiters.append(waiter)