Shut down subscriber read loop correctly #10
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readLoop was leaking goroutines when subscribers were unsubscribed, because it was blocked trying to write a nil to erChan in response to an upstream io.EOF. This commit passes in a context to startReadLoop, ensuring that when that context is closed, the read loop terminates correctly. For SubscribeWithContext we just pass in the parent context, as there is no way to unsubscribe the handler. For SubscribeChanWithContext, we pass in a derived cancelable context, which we cancel explicitly when the channel is unsubscribed.
Madoxen
approved these changes
Apr 28, 2025
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This cherry-picks an upstream PR r3labs#178
readLoop was leaking goroutines when subscribers were unsubscribed, because it was blocked trying to write a nil to erChan in response to an upstream io.EOF.
This commit passes in a context to startReadLoop, ensuring that when that context is closed, the read loop terminates correctly.
For SubscribeWithContext we just pass in the parent context, as there is no way to unsubscribe the handler.
For SubscribeChanWithContext, we pass in a derived cancelable context, which we cancel explicitly when the channel is unsubscribed.