109 lines
2.9 KiB
Go
109 lines
2.9 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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"net/url"
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"os"
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"strings"
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"go.opentelemetry.io/otel"
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"go.opentelemetry.io/otel/attribute"
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semconv "go.opentelemetry.io/otel/semconv/v1.21.0"
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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.ServiceName(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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var attrs []attribute.KeyValue
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var invalid []string
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for _, p := range pairs {
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k, v, found := strings.Cut(p, "=")
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if !found {
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invalid = append(invalid, p)
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continue
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}
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key := strings.TrimSpace(k)
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val, err := url.QueryUnescape(strings.TrimSpace(v))
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if err != nil {
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// Retain original value if decoding fails, otherwise it will be
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// an empty string.
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val = v
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otel.Handle(err)
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}
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attrs = append(attrs, attribute.String(key, val))
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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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