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73 lines
2.2 KiB
Go
73 lines
2.2 KiB
Go
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// 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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)
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// envVar is the environment variable name OpenTelemetry Resource information can be assigned to.
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const envVar = "OTEL_RESOURCE_ATTRIBUTES"
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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. If these resource attributes are not wanted, use the
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// WithFromEnv(nil) or WithoutBuiltin() options to explicitly disable
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// them.
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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(envVar))
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if attrs == "" {
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return Empty(), nil
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}
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return constructOTResources(attrs)
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}
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func constructOTResources(s string) (*Resource, error) {
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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 NewWithAttributes(attrs...), err
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}
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