ddlambda

README

datadog-lambda-go

Datadog Lambda Library for Go enables enhanced Lambda metrics, distributed tracing, and custom metric submission from AWS Lambda functions.

Installation

Follow the installation instructions, and view your function's enhanced metrics, traces and logs in Datadog.

Configurations

See the advanced configuration options to tag your telemetry, capture request/response payloads, filter or scrub sensitive information from logs or traces, and more.

Opening Issues

If you encounter a bug with this package, we want to hear about it. Before opening a new issue, search the existing issues to avoid duplicates.

When opening an issue, include the datadog-lambda-go version, go version, and stack trace if available. In addition, include the steps to reproduce when appropriate.

You can also open an issue for a feature request.

Contributing

If you find an issue with this package and have a fix, please feel free to open a pull request following the procedures.

Community

For product feedback and questions, join the #serverless channel in the Datadog community on Slack.

License

Unless explicitly stated otherwise all files in this repository are licensed under the Apache License Version 2.0.

This product includes software developed at Datadog (https://www.datadoghq.com/). Copyright 2021 Datadog, Inc.

Documentation

Index

• Constants
• func AddTraceHeaders(ctx context.Context, req *http.Request)
• func Distribution(metric string, value float64, tags ...string)
• func GetContext() context.Context
• func GetTraceHeaders(ctx context.Context) map[string]string
• func InvokeDryRun(callback func(ctx context.Context), cfg *Config) (interface{}, error)
• func Metric(metric string, value float64, tags ...string)
• func MetricWithTimestamp(metric string, value float64, timestamp time.Time, tags ...string)
• func WrapFunction(handler interface{}, cfg *Config) interface{}
• func WrapHandler(handler interface{}, cfg *Config) interface{}
• func WrapLambdaHandlerInterface(handler lambda.Handler, cfg *Config) lambda.Handler
• type Config

Constants

const (
	// DatadogAPIKeyEnvVar is the environment variable that will be used to set the API key.
	DatadogAPIKeyEnvVar = "DD_API_KEY"
	// DatadogKMSAPIKeyEnvVar is the environment variable that will be sent to KMS for decryption, then used as an API key.
	DatadogKMSAPIKeyEnvVar = "DD_KMS_API_KEY"
	// DatadogSiteEnvVar is the environment variable that will be used as the API host.
	DatadogSiteEnvVar = "DD_SITE"
	// LogLevelEnvVar is the environment variable that will be used to set the log level.
	LogLevelEnvVar = "DD_LOG_LEVEL"
	// ShouldUseLogForwarderEnvVar is the environment variable that enables log forwarding of metrics.
	ShouldUseLogForwarderEnvVar = "DD_FLUSH_TO_LOG"
	// DatadogTraceEnabledEnvVar is the environment variable that enables Datadog tracing.
	DatadogTraceEnabledEnvVar = "DD_TRACE_ENABLED"
	// MergeXrayTracesEnvVar is the environment variable that enables the merging of X-Ray and Datadog traces.
	MergeXrayTracesEnvVar = "DD_MERGE_XRAY_TRACES"
	// UniversalInstrumentation is the environment variable that enables universal instrumentation with the DD Extension
	UniversalInstrumentation = "DD_UNIVERSAL_INSTRUMENTATION"
	// Initialize otel tracer provider if enabled
	OtelTracerEnabled = "DD_TRACE_OTEL_ENABLED"

	// DefaultSite to send API messages to.
	DefaultSite = "datadoghq.com"
	// DefaultEnhancedMetrics enables enhanced metrics by default.
	DefaultEnhancedMetrics = true
)

Functions

func AddTraceHeaders

func AddTraceHeaders(ctx context.Context, req *http.Request)

AddTraceHeaders adds Datadog trace headers to a HTTP Request reflecting the current X-Ray subsegment. Deprecated: use native Datadog tracing instead.

func Distribution

func Distribution(metric string, value float64, tags ...string)

Distribution sends a distribution metric to Datadog Deprecated: Use Metric method instead

func GetContext

func GetContext() context.Context

GetContext retrieves the last created lambda context. Only use this if you aren't manually passing context through your call hierarchy.

func GetTraceHeaders

func GetTraceHeaders(ctx context.Context) map[string]string

GetTraceHeaders returns a map containing Datadog trace headers that reflect the current X-Ray subsegment. Deprecated: use native Datadog tracing instead.

func InvokeDryRun

func InvokeDryRun(callback func(ctx context.Context), cfg *Config) (interface{}, error)

InvokeDryRun is a utility to easily run your lambda for testing

func Metric

func Metric(metric string, value float64, tags ...string)

Metric sends a distribution metric to DataDog

func MetricWithTimestamp

func MetricWithTimestamp(metric string, value float64, timestamp time.Time, tags ...string)

MetricWithTimestamp sends a distribution metric to DataDog with a custom timestamp

func WrapFunction

func WrapFunction(handler interface{}, cfg *Config) interface{}

WrapFunction is used to instrument your lambda functions. It returns a modified handler that can be passed directly to the lambda.Start function from aws-lambda-go.

func WrapHandler

func WrapHandler(handler interface{}, cfg *Config) interface{}

WrapHandler is used to instrument your lambda functions. It returns a modified handler that can be passed directly to the lambda.Start function from aws-lambda-go. Deprecated: use WrapFunction instead

func WrapLambdaHandlerInterface

func WrapLambdaHandlerInterface(handler lambda.Handler, cfg *Config) lambda.Handler

WrapLambdaHandlerInterface is used to instrument your lambda functions. It returns a modified handler that can be passed directly to the lambda.StartHandler function from aws-lambda-go.

Types

type Config

type Config struct {
	// APIKey is your Datadog API key. This is used for sending metrics.
	APIKey string
	// KMSAPIKey is your Datadog API key, encrypted using the AWS KMS service. This is used for sending metrics.
	KMSAPIKey string
	// ShouldRetryOnFailure is used to turn on retry logic when sending metrics via the API. This can negatively effect the performance of your lambda,
	// and should only be turned on if you can't afford to lose metrics data under poor network conditions.
	ShouldRetryOnFailure bool
	// ShouldUseLogForwarder enabled the log forwarding method for sending metrics to Datadog. This approach requires the user to set up a custom lambda
	// function that forwards metrics from cloudwatch to the Datadog api. This approach doesn't have any impact on the performance of your lambda function.
	ShouldUseLogForwarder bool
	// BatchInterval is the period of time which metrics are grouped together for processing to be sent to the API or written to logs.
	// Any pending metrics are flushed at the end of the lambda.
	BatchInterval time.Duration
	// Site is the host to send metrics to. If empty, this value is read from the 'DD_SITE' environment variable, or if that is empty
	// will default to 'datadoghq.com'.
	Site string
	// DebugLogging will turn on extended debug logging.
	DebugLogging bool
	// EnhancedMetrics enables the reporting of enhanced metrics under `aws.lambda.enhanced*` and adds enhanced metric tags
	EnhancedMetrics bool
	// DDTraceEnabled enables the Datadog tracer.
	DDTraceEnabled bool
	// MergeXrayTraces will cause Datadog traces to be merged with traces from AWS X-Ray.
	MergeXrayTraces bool
	// HTTPClientTimeout specifies a time limit for requests to the API. It defaults to 5s.
	HTTPClientTimeout time.Duration
	// CircuitBreakerInterval is the cyclic period of the closed state
	// for the CircuitBreaker to clear the internal Counts.
	// default: 30s
	CircuitBreakerInterval time.Duration
	// CircuitBreakerTimeout is the period of the open state,
	// after which the state of the CircuitBreaker becomes half-open.
	// default: 60s
	CircuitBreakerTimeout time.Duration
	// CircuitBreakerTotalFailures after this amount of times
	// of a request failing in the closed state, the state will become open.
	// the counter will get totally reset after CircuitBreakerInterval
	// default: 4
	CircuitBreakerTotalFailures uint32
	// TraceContextExtractor is the function that extracts a root/parent trace context from the Lambda event body.
	// See trace.DefaultTraceExtractor for an example.
	TraceContextExtractor trace.ContextExtractor
}

Config gives options for how ddlambda should behave