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If rendering has failed due to a net.OpError stop rendering (attempt 2) (#19049)

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Unfortunately #18642 does not work because a `*net.OpError` does not implement
the `Is` interface to make `errors.Is` work correctly - thus leading to the
irritating conclusion that a `*net.OpError` is not a `*net.OpError`.

Here we keep the `errors.Is` because presumably this will be fixed at
some point in the golang main source code but also we add a simply type
cast to also check.

Fix #18629

Signed-off-by: Andrew Thornton <art27@cantab.net>
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zeripath 2022-03-10 20:23:15 +00:00 • committed by GitHub
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modules/context/context.go
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@ -269,7 +269,7 @@ func (ctx *Context) ServerError(logMsg string, logErr error) {
func (ctx *Context) serverErrorInternal(logMsg string, logErr error) { func (ctx *Context) serverErrorInternal(logMsg string, logErr error) {
if logErr != nil { if logErr != nil {
log.ErrorWithSkip(2, "%s: %v", logMsg, logErr) log.ErrorWithSkip(2, "%s: %v", logMsg, logErr)
if errors.Is(logErr, &net.OpError{}) { if _, ok := logErr.(*net.OpError); ok || errors.Is(logErr, &net.OpError{}) {
// This is an error within the underlying connection // This is an error within the underlying connection
// and further rendering will not work so just return // and further rendering will not work so just return
return return