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Delay evaluation of resource.Default to first call #2371

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merged 4 commits into from Nov 15, 2021
Merged

Delay evaluation of resource.Default to first call #2371

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f975a15
change resource.Default to be evaluated on first call, rather than on…
bmon Nov 11, 2021
a62df0c
guard defaultResource creation with sync.Once, fallback to emtpyResource
bmon Nov 11, 2021
0bee299
update CHANGELOG
bmon Nov 13, 2021
d39a348
Merge branch 'main' into delay-default-resource
MrAlias Nov 15, 2021
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33 changes: 15 additions & 18 deletions sdk/resource/resource.go
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Expand Up @@ -36,26 +36,11 @@ type Resource struct {
}

var (
emptyResource Resource

defaultResource = func(r *Resource, err error) *Resource {
if err != nil {
otel.Handle(err)
}
return r
}(
Detect(
context.Background(),
defaultServiceNameDetector{},
fromEnv{},
telemetrySDK{},
),
)
emptyResource Resource
defaultResource *Resource
)

var (
errMergeConflictSchemaURL = errors.New("cannot merge resource due to conflicting Schema URL")
)
var errMergeConflictSchemaURL = errors.New("cannot merge resource due to conflicting Schema URL")

// New returns a Resource combined from the user-provided detectors.
func New(ctx context.Context, opts ...Option) (*Resource, error) {
Expand Down Expand Up @@ -211,6 +196,18 @@ func Empty() *Resource {
// Default returns an instance of Resource with a default
// "service.name" and OpenTelemetrySDK attributes.
func Default() *Resource {
if defaultResource == nil {
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var err error
defaultResource, err = Detect(
context.Background(),
defaultServiceNameDetector{},
fromEnv{},
telemetrySDK{},
)
if err != nil {
otel.Handle(err)
}
}
return defaultResource
}

Expand Down