/
env.go
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/
env.go
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// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package resource // import "go.opentelemetry.io/otel/sdk/resource"
import (
"context"
"fmt"
"os"
"strings"
"go.opentelemetry.io/otel/attribute"
)
// envVar is the environment variable name OpenTelemetry Resource information can be assigned to.
const envVar = "OTEL_RESOURCE_ATTRIBUTES"
var (
// errMissingValue is returned when a resource value is missing.
errMissingValue = fmt.Errorf("%w: missing value", ErrPartialResource)
)
// FromEnv is a Detector that implements the Detector and collects
// resources from environment. This Detector is included as a
// builtin. If these resource attributes are not wanted, use the
// WithFromEnv(nil) or WithoutBuiltin() options to explicitly disable
// them.
type FromEnv struct{}
// compile time assertion that FromEnv implements Detector interface
var _ Detector = FromEnv{}
// Detect collects resources from environment
func (FromEnv) Detect(context.Context) (*Resource, error) {
labels := strings.TrimSpace(os.Getenv(envVar))
if labels == "" {
return Empty(), nil
}
return constructOTResources(labels)
}
func constructOTResources(s string) (*Resource, error) {
pairs := strings.Split(s, ",")
labels := []attribute.KeyValue{}
var invalid []string
for _, p := range pairs {
field := strings.SplitN(p, "=", 2)
if len(field) != 2 {
invalid = append(invalid, p)
continue
}
k, v := strings.TrimSpace(field[0]), strings.TrimSpace(field[1])
labels = append(labels, attribute.String(k, v))
}
var err error
if len(invalid) > 0 {
err = fmt.Errorf("%w: %v", errMissingValue, invalid)
}
return NewWithAttributes(labels...), err
}