AWS X-Ray SDK for Go ^(RC)

Installing

The AWS X-Ray SDK for Go is compatible with Go 1.7 and above.

Install the SDK using the following command (The SDK's non-testing dependencies will be installed):

go get -u github.com/aws/aws-xray-sdk-go/...

If you also want to install SDK's testing dependencies. They can be installed using:

go get -u -t github.com/aws/aws-xray-sdk-go/...

You may also use Glide to manage dependencies by using

glide install

Getting Help

Please use these community resources for getting help. We use the GitHub issues for tracking bugs and feature requests.

• Ask a question in the AWS X-Ray Forum.
• Open a support ticket with AWS Support.
• If you think you may have found a bug, please open an issue.

Opening Issues

If you encounter a bug with the AWS X-Ray SDK for Go we would like to hear about it. Search the existing issues and see if others are also experiencing the issue before opening a new issue. Please include the version of AWS X-Ray SDK for Go, AWS SDK for Go, Go language, and OS you’re using. Please also include repro case when appropriate.

The GitHub issues are intended for bug reports and feature requests. For help and questions regarding the use of the AWS X-Ray SDK for Go please make use of the resources listed in the Getting Help section. Keeping the list of open issues lean will help us respond in a timely manner.

Documentation

The developer guide provides in-depth guidance on using the AWS X-Ray service and the AWS X-Ray SDK for Go.

Quick Start

Configuration

import (
  "context"

  "github.com/aws/aws-xray-sdk-go/xray"

  // Importing the plugins enables collection of AWS resource information at runtime.
  // Every plugin should be imported after "github.com/aws/aws-xray-sdk-go/xray" library.
  _ "github.com/aws/aws-xray-sdk-go/plugins/ec2"
  _ "github.com/aws/aws-xray-sdk-go/plugins/beanstalk"
  _ "github.com/aws/aws-xray-sdk-go/plugins/ecs"
)

func init() {
  xray.Configure(xray.Config{
    DaemonAddr:       "127.0.0.1:2000", // default
    LogLevel:         "info",           // default
    ServiceVersion:   "1.2.3",
  })
}

Start a custom segment/subsegment

  // Start a segment
  ctx, seg := xray.BeginSegment(context.Background(), "service-name")
  // Start a subsegment
  ctx, subSeg := xray.BeginSubsegment(ctx, "subsegment-name")
  // ...
  // Add metadata or annotation here if necessary
  // ...
  subSeg.Close(nil)
  // Close the segment
  seg.Close(nil)

Capture

func criticalSection(ctx context.Context) {
  // This example traces a critical code path using a custom subsegment
  xray.Capture(ctx, "MyService.criticalSection", func(ctx1 context.Context) error {
    var err error

    section.Lock()
    result := someLockedResource.Go()
    section.Unlock()

    xray.AddMetadata(ctx1, "ResourceResult", result)
  })
}

HTTP Handler

func main() {
  http.Handle("/", xray.Handler(xray.NewFixedSegmentNamer("myApp"), http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
    w.Write([]byte("Hello!"))
  })))
  http.ListenAndServe(":8000", nil)
}

HTTP Client

func getExample(ctx context.Context) ([]byte, error) {
    resp, err := ctxhttp.Get(ctx, xray.Client(nil), "https://aws.amazon.com/")
    if err != nil {
      return nil, err
    }
    return ioutil.ReadAll(resp.Body)
}

AWS

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

SQL

Any db/sql calls can be traced with X-Ray by replacing the sql.Open call with xray.SQL. It is recommended to use URLs instead of configuration strings if possible.

func main() {
  db := xray.SQL("postgres", "postgres://user:password@host:port/db")
  row, _ := db.QueryRow("SELECT 1") // Use as normal
}

Lambda

Use AWS X-Ray SDK for Go to generate custom subsegments inside AWS Lambda handler function.

func HandleRequest(ctx context.Context, name string) (string, error) {
    xray.Configure(xray.Config{LogLevel: "trace"})
    sess := session.Must(session.NewSession())
    dynamo := dynamodb.New(sess)
    xray.AWS(dynamo.Client)
    input := &dynamodb.PutItemInput{
        Item: map[string]*dynamodb.AttributeValue{
            "12": {
                S: aws.String("example"),
            },
        },
        TableName: aws.String("xray"),
    }
    _, err := dynamo.PutItemWithContext(ctx, input)
    if err != nil {
        return name, err
    }
    _, err = ctxhttp.Get(ctx, xray.Client(nil), "https://www.twitch.tv/")
    if err != nil {
        return name, err
    }
   
    return fmt.Sprintf("Hello %s!", name), nil
}

License

The AWS X-Ray SDK for Go is licensed under the Apache 2.0 License. See LICENSE and NOTICE.txt for more information.