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Reuse stream if it already exists #26

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Reuse stream if it already exists #26

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d467365
replace plain add_stream with _add_or_reuse_stream
Bartr4 Mar 19, 2026
8f42d71
update stream when reusing
Bartr4 Mar 19, 2026
a45451c
fix update stream input
Bartr4 Mar 19, 2026
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12 changes: 11 additions & 1 deletion taskiq_nats/broker.py
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Original file line number Diff line number Diff line change
Expand Up @@ -7,6 +7,7 @@
from nats.errors import TimeoutError as NatsTimeoutError
from nats.js import JetStreamContext
from nats.js.api import ConsumerConfig, StreamConfig
from nats.js.errors import NotFoundError as StreamNotFoundError
from taskiq import AckableMessage, AsyncBroker, AsyncResultBackend, BrokerMessage

_T = typing.TypeVar("_T") # (Too short)
Expand Down Expand Up @@ -138,6 +139,15 @@ def __init__(

self.consumer: JetStreamConsumerType

async def _add_or_reuse_stream(self) -> None:
try:
await self.js.stream_info(self.stream_config.name)
await self.js.update_stream(self.stream_config)
logger.info(f"Stream {self.stream_config.name} already exists and was reused.")
except StreamNotFoundError:
await self.js.add_stream(config=self.stream_config)
logger.info(f"Created stream {self.stream_config.name}")

async def startup(self) -> None:
"""
Startup event handler.
Expand All @@ -152,7 +162,7 @@ async def startup(self) -> None:
self.stream_config.name = self.stream_name
if not self.stream_config.subjects:
self.stream_config.subjects = [self.subject]
await self.js.add_stream(config=self.stream_config)
await self._add_or_reuse_stream()
await self._startup_consumer()

async def shutdown(self) -> None:
Expand Down