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https://github.com/open-telemetry/opentelemetry-go.git
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92ccad7bd9
Resolve #3544 Replace all custom implementations for multi-error unification with the `errors.Join` function of the standard library.
93 lines
3.1 KiB
Go
93 lines
3.1 KiB
Go
// Copyright The OpenTelemetry Authors
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// SPDX-License-Identifier: Apache-2.0
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package resource // import "go.opentelemetry.io/otel/sdk/resource"
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import (
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"context"
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"errors"
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"fmt"
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)
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// ErrPartialResource is returned by a detector when complete source
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// information for a Resource is unavailable or the source information
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// contains invalid values that are omitted from the returned Resource.
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var ErrPartialResource = errors.New("partial resource")
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// Detector detects OpenTelemetry resource information.
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type Detector interface {
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// DO NOT CHANGE: any modification will not be backwards compatible and
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// must never be done outside of a new major release.
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// Detect returns an initialized Resource based on gathered information.
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// If the source information to construct a Resource contains invalid
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// values, a Resource is returned with the valid parts of the source
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// information used for initialization along with an appropriately
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// wrapped ErrPartialResource error.
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Detect(ctx context.Context) (*Resource, error)
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// DO NOT CHANGE: any modification will not be backwards compatible and
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// must never be done outside of a new major release.
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}
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// Detect returns a new [Resource] merged from all the Resources each of the
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// detectors produces. Each of the detectors are called sequentially, in the
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// order they are passed, merging the produced resource into the previous.
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//
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// This may return a partial Resource along with an error containing
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// [ErrPartialResource] if that error is returned from a detector. It may also
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// return a merge-conflicting Resource along with an error containing
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// [ErrSchemaURLConflict] if merging Resources from different detectors results
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// in a schema URL conflict. It is up to the caller to determine if this
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// returned Resource should be used or not.
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//
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// If one of the detectors returns an error that is not [ErrPartialResource],
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// the resource produced by the detector will not be merged and the returned
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// error will wrap that detector's error.
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func Detect(ctx context.Context, detectors ...Detector) (*Resource, error) {
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r := new(Resource)
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return r, detect(ctx, r, detectors)
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}
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// detect runs all detectors using ctx and merges the result into res. This
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// assumes res is allocated and not nil, it will panic otherwise.
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//
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// If the detectors or merging resources produces any errors (i.e.
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// [ErrPartialResource] [ErrSchemaURLConflict]), a single error wrapping all of
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// these errors will be returned. Otherwise, nil is returned.
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func detect(ctx context.Context, res *Resource, detectors []Detector) error {
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var (
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r *Resource
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err error
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e error
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)
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for _, detector := range detectors {
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if detector == nil {
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continue
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}
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r, e = detector.Detect(ctx)
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if e != nil {
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err = errors.Join(err, e)
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if !errors.Is(e, ErrPartialResource) {
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continue
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}
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}
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r, e = Merge(res, r)
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if e != nil {
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err = errors.Join(err, e)
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}
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*res = *r
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}
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if err != nil {
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if errors.Is(err, ErrSchemaURLConflict) {
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// If there has been a merge conflict, ensure the resource has no
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// schema URL.
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res.schemaURL = ""
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}
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err = fmt.Errorf("error detecting resource: %w", err)
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}
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return err
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}
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