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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
package lambda // import "go.opentelemetry.io/contrib/detectors/aws/lambda"
import (
"context"
"errors"
"os"
"strconv"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/sdk/resource"
semconv "go.opentelemetry.io/otel/semconv/v1.26.0"
)
// 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" //nolint:gosec // False positive G101: Potential hardcoded credentials. The function name is added as attribute per semantic conventions.
awsRegionEnvVar = "AWS_REGION"
lambdaFunctionVersionEnvVar = "AWS_LAMBDA_FUNCTION_VERSION"
lambdaLogStreamNameEnvVar = "AWS_LAMBDA_LOG_STREAM_NAME"
lambdaMemoryLimitEnvVar = "AWS_LAMBDA_FUNCTION_MEMORY_SIZE"
)
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)
// The instance attributes corresponds to the log stream name for AWS lambda,
// see the FaaS resource specification for more details.
instance := os.Getenv(lambdaLogStreamNameEnvVar)
attrs := []attribute.KeyValue{
semconv.CloudProviderAWS,
semconv.CloudRegion(awsRegion),
semconv.FaaSInstance(instance),
semconv.FaaSName(lambdaName),
semconv.FaaSVersion(functionVersion),
}
maxMemoryStr := os.Getenv(lambdaMemoryLimitEnvVar)
maxMemory, err := strconv.Atoi(maxMemoryStr)
if err == nil {
attrs = append(attrs, semconv.FaaSMaxMemory(maxMemory))
}
return resource.NewWithAttributes(semconv.SchemaURL, attrs...), nil
}
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