/
detector.go
69 lines (58 loc) · 2.36 KB
/
detector.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 lambda // import "go.opentelemetry.io/contrib/detectors/aws/lambda"
import (
"context"
"errors"
"os"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/sdk/resource"
semconv "go.opentelemetry.io/otel/semconv/v1.12.0"
)
// For a complete list of reserved environment variables in Lambda, see:
// https://docs.aws.amazon.com/lambda/latest/dg/configuration-envvars.html
const (
lambdaFunctionNameEnvVar = "AWS_LAMBDA_FUNCTION_NAME"
awsRegionEnvVar = "AWS_REGION"
lambdaFunctionVersionEnvVar = "AWS_LAMBDA_FUNCTION_VERSION"
)
var (
empty = resource.Empty()
errNotOnLambda = errors.New("process is not on Lambda, cannot detect environment variables from Lambda")
)
// resource detector collects resource information from Lambda environment.
type resourceDetector struct{}
// compile time assertion that resource detector implements the resource.Detector interface.
var _ resource.Detector = (*resourceDetector)(nil)
// NewResourceDetector returns a resource detector that will detect AWS Lambda resources.
func NewResourceDetector() resource.Detector {
return &resourceDetector{}
}
// Detect collects resource attributes available when running on lambda.
func (detector *resourceDetector) Detect(context.Context) (*resource.Resource, error) {
// Lambda resources come from ENV
lambdaName := os.Getenv(lambdaFunctionNameEnvVar)
if len(lambdaName) == 0 {
return empty, errNotOnLambda
}
awsRegion := os.Getenv(awsRegionEnvVar)
functionVersion := os.Getenv(lambdaFunctionVersionEnvVar)
attrs := []attribute.KeyValue{
semconv.CloudProviderAWS,
semconv.CloudRegionKey.String(awsRegion),
semconv.FaaSNameKey.String(lambdaName),
semconv.FaaSVersionKey.String(functionVersion),
}
return resource.NewWithAttributes(semconv.SchemaURL, attrs...), nil
}