observability: fix err access scope to correctly retrieve it on defer #43
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odeke-em
requested changes
May 17, 2020
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Thank you for catching this bug @otternq and for submitting this PR.
I have posted up some suggestions, please take a look. Could you also update
the commit subject and message to
observability: fix err access scope to correctly retrieve it on defer
Fixes a bug in which we mistakenly used the earliest value of err
which was always nil, when measuring latency. The fix here is
to invoke the latency measuring closure inside a defer to correctly
capture the latest value of the named err value.
driver.go
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| var recordCallStatsFunc = recordCallStats(ctx, "go.sql.ping", c.options.InstanceName) | ||
| defer func() { | ||
| recordCallStatsFunc(err) | ||
| }() |
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onDeferWithErr := recordCallStats(ctx, "go.sql.ping", c.options.InstanceName)
defer func() {
// Invoking this function in a defer so that we can capture
// the value of err as set on function exit.
onDeferWithErr(err)
}()Fixes a bug in which we mistakenly used the earliest value of err which was always nil, when measuring latency. The fix here is to invoke the latency measuring closure inside a defer to correctly capture the latest value of the named err value.
otternq
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Thanks for the review @odeke-em, I've changed the commit message and applied your suggestions. |
odeke-em
changed the title
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And thank you again @otternq, I have cut release https://github.com/opencensus-integrations/ocsql/releases/tag/v0.1.6 @a8m @yancl @lwc y'all might wanna upgrade to the latest release, thanks! |
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Thanks for your info, @odeke-em :) |
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Ensure the final
errvalue is reported to recordCallStats' annonymous function instead ofnil.Stats were always reporting
GoSQLStatusasOKeven when queries failed. This change will allow the status to beERRORand forGoSQLErrorto be populated.