eth/filters, eth/tracers: add request cancellation checks #26320
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fjl
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This ensures that RPC method handlers will react to a timeout or cancelled request soon after the event occurs.
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fjl
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Dec 7, 2022
eth/tracers/api.go
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| case jobs <- task: | ||
| case <-ctx.Done(): | ||
| failed = ctx.Err() | ||
| break |
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Classic mistake here, break here will terminate the select instead of enclosing loop.
s1na
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Dec 7, 2022
| for i, tx := range txs { | ||
| // Send the trace task over for execution | ||
| jobs <- &txTraceTask{statedb: statedb.Copy(), index: i} | ||
| task := &txTraceTask{statedb: statedb.Copy(), index: i} | ||
| select { |
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Is this more efficient than simply checking ctx.Err() at the beginning of the loop?
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It's not more efficient, I just did it because the send could theoretically block at this point. Canceling the context would unblock it. However, it seems the jobs channel is actually buffered, and so the send will always succeed.
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Jun 6, 2023
…6320) This ensures that RPC method handlers will react to a timeout or cancelled request soon after the event occurs. Co-authored-by: Sina Mahmoodi <itz.s1na@gmail.com>
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This ensures that RPC method handlers will react to a timeout or cancelled request soon after the event occurs.