mirror of
https://github.com/open-telemetry/opentelemetry-go.git
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c4ba4811a2
* Add semconv/v1.7.0 package Generated from the v1.7.0 release of the specification using the semconvgen tool manually. This also updates the project to use this version of the semconv package. This does not include the prior, and missing, v1.5.0 and v1.6.0 versions of the semconv package. They are planned to be added in a follow-on PR. * Update CHANGELOG.md
100 lines
2.7 KiB
Go
100 lines
2.7 KiB
Go
// Copyright The OpenTelemetry Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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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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"fmt"
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"os"
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"strings"
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"go.opentelemetry.io/otel/attribute"
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semconv "go.opentelemetry.io/otel/semconv/v1.7.0"
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)
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const (
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// resourceAttrKey is the environment variable name OpenTelemetry Resource information will be read from.
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resourceAttrKey = "OTEL_RESOURCE_ATTRIBUTES"
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// svcNameKey is the environment variable name that Service Name information will be read from.
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svcNameKey = "OTEL_SERVICE_NAME"
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)
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var (
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// errMissingValue is returned when a resource value is missing.
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errMissingValue = fmt.Errorf("%w: missing value", ErrPartialResource)
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)
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// fromEnv is a Detector that implements the Detector and collects
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// resources from environment. This Detector is included as a
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// builtin.
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type fromEnv struct{}
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// compile time assertion that FromEnv implements Detector interface
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var _ Detector = fromEnv{}
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// Detect collects resources from environment
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func (fromEnv) Detect(context.Context) (*Resource, error) {
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attrs := strings.TrimSpace(os.Getenv(resourceAttrKey))
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svcName := strings.TrimSpace(os.Getenv(svcNameKey))
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if attrs == "" && svcName == "" {
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return Empty(), nil
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}
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var res *Resource
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if svcName != "" {
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res = NewSchemaless(semconv.ServiceNameKey.String(svcName))
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}
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r2, err := constructOTResources(attrs)
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// Ensure that the resource with the service name from OTEL_SERVICE_NAME
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// takes precedence, if it was defined.
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res, err2 := Merge(r2, res)
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if err == nil {
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err = err2
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} else if err2 != nil {
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err = fmt.Errorf("detecting resources: %s", []string{err.Error(), err2.Error()})
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}
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return res, err
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}
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func constructOTResources(s string) (*Resource, error) {
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if s == "" {
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return Empty(), nil
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}
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pairs := strings.Split(s, ",")
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attrs := []attribute.KeyValue{}
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var invalid []string
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for _, p := range pairs {
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field := strings.SplitN(p, "=", 2)
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if len(field) != 2 {
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invalid = append(invalid, p)
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continue
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}
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k, v := strings.TrimSpace(field[0]), strings.TrimSpace(field[1])
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attrs = append(attrs, attribute.String(k, v))
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}
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var err error
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if len(invalid) > 0 {
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err = fmt.Errorf("%w: %v", errMissingValue, invalid)
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}
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return NewSchemaless(attrs...), err
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}
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