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Shut down all processors even on error #3091

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merged 2 commits into from Sep 2, 2022
Merged

Shut down all processors even on error #3091

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e327663
Shut down all processors even on error
ash2k Aug 13, 2022
7dedf49
Merge branch 'main' into always-shut-down-all-processors
MadVikingGod Sep 2, 2022
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22 changes: 12 additions & 10 deletions sdk/trace/provider.go
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Expand Up @@ -90,10 +90,10 @@ var _ trace.TracerProvider = &TracerProvider{}
// NewTracerProvider returns a new and configured TracerProvider.
//
// By default the returned TracerProvider is configured with:
// - a ParentBased(AlwaysSample) Sampler
// - a random number IDGenerator
// - the resource.Default() Resource
// - the default SpanLimits.
// - a ParentBased(AlwaysSample) Sampler
// - a random number IDGenerator
// - the resource.Default() Resource
// - the default SpanLimits.
//
// The passed opts are used to override these default values and configure the
// returned TracerProvider appropriately.
Expand Down Expand Up @@ -241,10 +241,7 @@ func (p *TracerProvider) Shutdown(ctx context.Context) error {
if !ok {
return fmt.Errorf("failed to load span processors")
}
if len(spss) == 0 {
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return nil
}

var retErr error
for _, sps := range spss {
select {
case <-ctx.Done():
Expand All @@ -257,10 +254,15 @@ func (p *TracerProvider) Shutdown(ctx context.Context) error {
err = sps.sp.Shutdown(ctx)
})
if err != nil {
return err
if retErr == nil {
retErr = err
} else {
// Poor man's list of errors
retErr = fmt.Errorf("%v; %v", retErr, err)
}
Comment on lines +264 to +269
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Suggested change
if retErr == nil {
retErr = err
} else {
// Poor man's list of errors
retErr = fmt.Errorf("%v; %v", retErr, err)
}
if retErr != nil {
// Poor man's list of errors
retErr = fmt.Errorf("%v; %v", retErr, err)
}
retErr = err

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This doesn't work the way it should, does it?

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@ash2k's version looks correct to me.

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Suggested change
if retErr == nil {
retErr = err
} else {
// Poor man's list of errors
retErr = fmt.Errorf("%v; %v", retErr, err)
}
if retErr != nil {
// Poor man's list of errors
err = fmt.Errorf("%w; %w", retErr, err)
}
retErr = err

This might work, but the original also looks correct. Any reason to not use multierr here?

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@Aneurysm9 If you are talking about https://pkg.go.dev/go.uber.org/multierr, it's not a dependency at the moment and it doesn't feel worth adding it just for this case. In 99% of cases there will be no errors here and it's probably very unlikely that there will be more than one. In this PR I just wanted to ensure all processors are shut down even if there is an error. If there is a better way to handle multiple errors that is discovered later, this code can always be changed.

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@Aneurysm9 are you satisfied with this answer, or are there further changes you want to request?

}
}
return nil
return retErr
}

// TracerProviderOption configures a TracerProvider.
Expand Down
22 changes: 22 additions & 0 deletions sdk/trace/provider_test.go
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Expand Up @@ -72,6 +72,28 @@ func TestFailedProcessorShutdown(t *testing.T) {
assert.Equal(t, err, spErr)
}

func TestFailedProcessorsShutdown(t *testing.T) {
stp := NewTracerProvider()
spErr1 := errors.New("basic span processor shutdown failure1")
spErr2 := errors.New("basic span processor shutdown failure2")
sp1 := &basicSpanProcesor{
running: true,
injectShutdownError: spErr1,
}
sp2 := &basicSpanProcesor{
running: true,
injectShutdownError: spErr2,
}
stp.RegisterSpanProcessor(sp1)
stp.RegisterSpanProcessor(sp2)

err := stp.Shutdown(context.Background())
assert.Error(t, err)
assert.EqualError(t, err, "basic span processor shutdown failure1; basic span processor shutdown failure2")
assert.False(t, sp1.running)
assert.False(t, sp2.running)
}

func TestFailedProcessorShutdownInUnregister(t *testing.T) {
handler.Reset()
stp := NewTracerProvider()
Expand Down