aws-xray-yasdk-go

README

aws-xray-yasdk-go

Yet Another AWS X-Ray SDK for Go

The Yet Another AWS X-Ray SDK for Go is compatible with Go 1.13 and above.

TODO

• implement ECS plugin
• implement EKS plugin
• implement beanstalk plugin

Configuration

Environment Values

• AWS_XRAY_DAEMON_ADDRESS: Set the host and port of the X-Ray daemon listener. By default, the SDK uses 127.0.0.1:2000 for both trace data (UDP) and sampling (TCP).
• AWS_XRAY_CONTEXT_MISSING: LOG_ERROR or RUNTIME_ERROR. The default value is LOG_ERROR.
• AWS_XRAY_TRACING_NAME: Set a service name that the SDK uses for segments.
• AWS_XRAY_DEBUG_MODE: Set to TRUE to configure the SDK to output logs to the console
• AWS_XRAY_LOG_LEVEL: Set a log level for the SDK built in logger. it should be debug, info, warn, error or silent. This value is ignored if AWS_XRAY_DEBUG_MODE is set.
• AWS_XRAY_SDK_ENABLED: Disabling the SDK. It is parsed by strconv.ParseBool that accepts 1, t, T, TRUE, true, True, 0, f, F, FALSE, false, False. The default value is true.

Code

These configure overwrites the environment configure.

// configure the daemon address and the context missing strategy.
xray.Configure(&xray.Config{
  DaemonAddress:          "127.0.0.1:2000",
  ContextMissingStrategy: &ctxmissing.RuntimeErrorStrategy{},
})

// configure the default logger.
xraylog.SetLogger(NewDefaultLogger(os.Stderr, xraylog.LogLevelDebug))

Quick Start

Start a custom segment/subsegment

func DoSomethingWithSegment(ctx context.Context) error
  ctx, seg := xray.BeginSegment(ctx, "service-name")
  defer seg.Close()

  ctx, sub := xray.BeginSubsegment(ctx, "subsegment-name")
  defer sub.Close()

  err := doSomething(ctx)
  if sub.AddError(err) { // AddError returns the result of err != nil
    return err
  }
  return nil
}

HTTP Server

func main() {
  namer := xrayhttp.FixedTracingNamer("myApp")
  h := xrayhttp.Handler(namer, http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
    fmt.Fprint(w, "Hello World!")
  }))
  http.ListenAndServe(":8000", h)
}

HTTP Client

func getExample(ctx context.Context) ([]byte, error) {
  req, err := http.NewRequest(http.MethodGet, "http://example.com")
  if err != nil {
    return nil, err
  }
  req = req.WithContext(ctx)

  client = xrayhttp.Client(nil)
  resp, err := client.Do(req)
  if err != nil {
      return nil, err
  }
  defer resp.Body.Close()
  return ioutil.ReadAll(resp.Body)
}

AWS SDK

sess := session.Must(session.NewSession())
dynamo := dynamodb.New(sess)
xrayaws.Client(dynamo.Client)
dynamo.ListTablesWithContext(ctx, &dynamodb.ListTablesInput{})

SQL

func main() {
  db, err := xraysql.Open("postgres", "postgres://user:password@host:port/db")
  row, err := db.QueryRowContext(ctx, "SELECT 1")
}

See Also

• AWS X-Ray
• Official AWS X-Ray SDK for Go