rpc: fix rare deadlock when canceling HTTP call context #19715
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When cancelling the context for a call on a HTTP-based client while the call is running, the select in requestOp.wait may hit the <-context.Done() case instead of the <-op.resp case. This doesn't happen often -- our cancel test hasn't caught this even though it ran thousands of times on CI since the RPC client was added. Fixes ethereum#19714
holiman
approved these changes
Jun 14, 2019
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When cancelling the context for a call on a HTTP-based client while the
call is running, the select in requestOp.wait may hit the <-context.Done()
case instead of the <-op.resp case. This doesn't happen often -- our
cancel test hasn't caught this even though it ran thousands of times
on CI since the RPC client was added.
Fixes #19714