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https://github.com/aws/aws-xray-sdk-go

AWS X-Ray SDK for the Go programming language.
https://github.com/aws/aws-xray-sdk-go

aws aws-xray go

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AWS X-Ray SDK for the Go programming language.

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README 

        
![Test](https://github.com/aws/aws-xray-sdk-go/workflows/Test/badge.svg)

[![Go Report Card](https://goreportcard.com/badge/github.com/aws/aws-xray-sdk-go)](https://goreportcard.com/report/github.com/aws/aws-xray-sdk-go)



### :mega: OpenTelemetry Go with AWS X-Ray



AWS X-Ray supports using OpenTelemetry Go and the AWS Distro for OpenTelemetry (ADOT) Collector to instrument your application and send trace data to X-Ray. The OpenTelemetry SDKs are an industry-wide standard for tracing instrumentation. They provide more instrumentations and have a larger community for support, but may not have complete feature parity with the X-Ray SDKs. See [choosing between the ADOT and X-Ray SDKs](https://docs.aws.amazon.com/xray/latest/devguide/xray-instrumenting-your-app.html#xray-instrumenting-choosing) for more help with choosing between the two.



If you want additional features when tracing your Go applications, please [open an issue on the OpenTelemetry Go Instrumentation repository](https://github.com/open-telemetry/opentelemetry-go-contrib/issues/new?title=X-Ray%20Compatible%20Feature%20Request).



# AWS X-Ray SDK for Go



![Screenshot of the AWS X-Ray console](/images/example.png?raw=true)



## Installing into GOPATH



The AWS X-Ray SDK for Go is compatible with Go 1.19 and above.



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

Use `go get` to retrieve the SDK to add it to your `GOPATH` workspace:



```

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

```



To update the SDK, use `go get -u` to retrieve the latest version of the SDK.



```

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/...

```



## Installing using Go Modules



The latest version of the SDK is the recommended version.



If you are using Go 1.11 and above, you can install the SDK using Go Modules (in project's go.mod), like so: 



```

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

```



To get a different specific release version of the SDK use `@` in your `go get` command. Also, to get the rc version use this command with the specific version.



```

go get github.com/aws/[email protected]

```



## 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](https://forums.aws.amazon.com/forum.jspa?forumID=241&start=0).

* Open a support ticket with [AWS Support](http://docs.aws.amazon.com/awssupport/latest/user/getting-started.html).

* If you think you may have found a bug, please open an [issue](https://github.com/aws/aws-xray-sdk-go/issues/new).



## 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](https://github.com/aws/aws-xray-sdk-go/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](https://github.com/aws/aws-xray-sdk-go#getting-help) section. Keeping the list of open issues lean will help us respond in a timely manner.



## Documentation



The [developer guide](https://docs.aws.amazon.com/xray/latest/devguide/xray-sdk-go.html) provides in-depth guidance on using the AWS X-Ray service and the AWS X-Ray SDK for Go.



See [aws-xray-sdk-go-sample](https://github.com/aws-samples/aws-xray-sdk-go-sample) for a sample application that provides example of tracing SQL queries, incoming and outgoing request. Follow [README instructions](https://github.com/aws-samples/aws-xray-sdk-go-sample/blob/master/README.md) in that repository to get started with sample application.



## Quick Start



**Configuration**



```go

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



func init() {

  xray.Configure(xray.Config{

    DaemonAddr:       "127.0.0.1:2000", // default

    ServiceVersion:   "1.2.3",

  })

}

```

***Logger***



xray uses an interface for its logger:



```go

type Logger interface {

  Log(level LogLevel, msg fmt.Stringer)

}



const (

  LogLevelDebug LogLevel = iota + 1

  LogLevelInfo

  LogLevelWarn

  LogLevelError

)

```



The default logger logs to [stdout](https://golang.org/pkg/syscall/#Stdout) at "info" and above. To change the logger, call `xray.SetLogger(myLogger)`. There is a default logger implementation that writes to an `io.Writer` from a specified minimum log level. For example, to log to stderr at "error" and above:



```go

xray.SetLogger(xraylog.NewDefaultLogger(os.Stderr, xraylog.LogLevelError))

```



Note that the `xray.Config{}` fields `LogLevel` and `LogFormat` are deprecated starting from version `1.0.0-rc.10` and no longer have any effect.



***Plugins***



Plugins can be loaded conditionally at runtime. For this purpose, plugins under "github.com/aws/aws-xray-sdk-go/awsplugins/" have an explicit `Init()` function. Customer must call this method to load the plugin:



```go

import (

  "os"



  "github.com/aws/aws-xray-sdk-go/awsplugins/ec2"

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

)



func init() {

  // conditionally load plugin

  if os.Getenv("ENVIRONMENT") == "production" {

    ec2.Init()

  }



  xray.Configure(xray.Config{

    ServiceVersion:   "1.2.3",

  })

}

```



**Start a custom segment/subsegment**

Note that customers using xray.BeginSegment API directly will only be able to evaluate sampling rules based on service name.



```go

  // Start a segment

  ctx, seg := xray.BeginSegment(context.Background(), "service-name")

  // Start a subsegment

  subCtx, subSeg := xray.BeginSubsegment(ctx, "subsegment-name")

  // ...

  // Add metadata or annotation here if necessary

  // ...

  subSeg.Close(nil)

  // Close the segment

  seg.Close(nil)

```



**Generate no-op trace and segment id**



X-Ray Go SDK will by default generate no-op trace and segment id for unsampled requests and secure random trace and entity id for sampled requests. If customer wants to enable generating secure random trace and entity id for all the (sampled/unsampled) requests (this is applicable for trace id injection into logs use case) then they achieve that by setting AWS_XRAY_NOOP_ID environment variable as False.



**Disabling XRay Tracing**



XRay tracing can be disabled by setting up environment variable `AWS_XRAY_SDK_DISABLED` . Disabling XRay can be useful for specific use case like if customer wants to stop tracing in their test environment they can do so just by setting up the environment variable.



```go

  // Set environment variable TRUE to disable XRay

  os.Setenv("AWS_XRAY_SDK_DISABLED", "TRUE")

```



**Capture**



```go

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**



```go

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**



```go

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 SDK Instrumentation**



```go

func main() {

  // Create a segment

  ctx, root := xray.BeginSegment(context.TODO(), "AWSSDKV1_Dynamodb")

  defer root.Close(nil)



  sess := session.Must(session.NewSession())

  dynamo := dynamodb.New(sess)

  // Instrumenting with AWS SDK v1:

  // Wrap the client object with `xray.AWS()`

  xray.AWS(dynamo.Client)

  // Use the `-WithContext` version of the `ListTables` method

  output := dynamo.ListTablesWithContext(ctx, &dynamodb.ListTablesInput{})

  doSomething(output)

}

```

*Segment creation is not necessary in an AWS Lambda function, where the segment is created automatically*



**AWS SDK V2 Instrumentation**



```go

package main



import (

	"context"

	"log"



	"github.com/aws/aws-sdk-go-v2/aws"

	"github.com/aws/aws-sdk-go-v2/config"

	"github.com/aws/aws-sdk-go-v2/service/dynamodb"

	"github.com/aws/aws-xray-sdk-go/instrumentation/awsv2"

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

)



func main() {

	// Create a segment

	ctx, root := xray.BeginSegment(context.TODO(), "AWSSDKV2_Dynamodb")

	defer root.Close(nil)

  

	cfg, err := config.LoadDefaultConfig(ctx, config.WithRegion("us-west-2"))

	if err != nil {

		log.Fatalf("unable to load SDK config, %v", err)

	}

	// Instrumenting AWS SDK v2

	awsv2.AWSV2Instrumentor(&cfg.APIOptions)

	// Using the Config value, create the DynamoDB client

	svc := dynamodb.NewFromConfig(cfg)

	// Build the request with its input parameters

	_, err = svc.ListTables(ctx, &dynamodb.ListTablesInput{

		Limit: aws.Int32(5),

	})

	if err != nil {

		log.Fatalf("failed to list tables, %v", err)

	}

}

```

*Segment creation is not necessary in an AWS Lambda function, where the segment is created automatically*



**S3**



`aws-xray-sdk-go` does not currently support [`*Request.Presign()`](https://docs.aws.amazon.com/sdk-for-go/api/aws/request/#Request.Presign) operations and will panic if one is encountered.  This results in an error similar to: 



`panic: failed to begin subsegment named 's3': segment cannot be found.`



If you encounter this, you can set `AWS_XRAY_CONTEXT_MISSING` environment variable to `LOG_ERROR`.  This will instruct the SDK to log the error and continue processing your requests.



```go

os.Setenv("AWS_XRAY_CONTEXT_MISSING", "LOG_ERROR")

```



**SQL**



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



```go

func main() {

  db, err := xray.SQLContext("postgres", "postgres://user:password@host:port/db")

  row, err := db.QueryRowContext(ctx, "SELECT 1") // Use as normal

}

```



**Lambda**



```

For Lambda support use version v1.0.0-rc.1 and higher

```



If you are using the AWS X-Ray Go SDK inside a Lambda function, there will be a FacadeSegment inside the Lambda context.  This allows you to instrument your Lambda function using `Configure`, `Capture`, `HTTP Client`, `AWS`, `SQL` and `Custom Subsegments` usage.  `Segment` operations are not supported.



```go

func HandleRequest(ctx context.Context, name string) (string, error) {

    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

    }

    

    _, subseg := xray.BeginSubsegment(ctx, "subsegment-name")

    subseg.Close(nil)

    

    db := xray.SQLContext("postgres", "postgres://user:password@host:port/db")

    row, _ := db.QueryRow(ctx, "SELECT 1")

    

    return fmt.Sprintf("Hello %s!", name), nil

}

```



**gRPC**



Note: `aws-xray-sdk-go` doesn't currently support streaming gRPC call.



Apply xray gRPC interceptors (`xray.UnaryServerInterceptor` or `xray.UnaryClientInterceptor`) to instrument gRPC unary requests/responses, and the handling code.



**gRPC Client**



```go

conn, err := grpc.Dial(

    serverAddr,

    // use grpc.WithChainUnaryInterceptor instead to apply multiple interceptors

    grpc.WithUnaryInterceptor(

        xray.UnaryClientInterceptor(),

        // or xray.UnaryClientInterceptor(xray.WithSegmentNamer(xray.NewFixedSegmentNamer("myApp"))) to use a custom segment namer

    ),

)

```



**gRPC Server**



```go

grpcServer := grpc.NewServer(

    // use grpc.ChainUnaryInterceptor instead to apply multiple interceptors

    grpc.UnaryInterceptor(

        xray.UnaryServerInterceptor(),

        // or xray.UnaryServerInterceptor(xray.WithSegmentNamer(xray.NewFixedSegmentNamer("myApp"))) to use a custom segment namer

    ),

)

```



## fasthttp instrumentation 



Support for incoming requests with [valyala/fasthttp](https://github.com/valyala/fasthttp):



```go

package main



import (

	"fmt"

	"log"

	"os"



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

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

	"github.com/fasthttp/router"

	"github.com/valyala/fasthttp"

)



func index(ctx *fasthttp.RequestCtx) {

	ctx.WriteString("Welcome!")

}



func hello(ctx *fasthttp.RequestCtx) {

	fmt.Fprintf(ctx, "Hello, %s!\n", ctx.UserValue("name"))

}



func middleware(name string, h fasthttp.RequestHandler, fh xray.FastHTTPHandler) fasthttp.RequestHandler {

	f := func(ctx *fasthttp.RequestCtx) {

		h(ctx)

	}



	return fh.Handler(xray.NewFixedSegmentNamer(name), f)

}



func init() {

	if err := xray.Configure(xray.Config{

		DaemonAddr:     "xray:2000",

		ServiceVersion: "0.1",

	}); err != nil {

		panic(err)

	}



	xray.SetLogger(xraylog.NewDefaultLogger(os.Stdout, xraylog.LogLevelDebug))

}



func main() {

	fh := xray.NewFastHTTPInstrumentor(nil)

	r := router.New()

	r.GET("/", middleware("index", index, fh))

	r.GET("/hello/{name}", middleware("hello", hello, fh))



	log.Fatal(fasthttp.ListenAndServe(":8080", r.Handler))

}

```



## Oversampling Mitigation

Oversampling mitigation allows you to ignore a parent segment/subsegment's sampled flag and instead sets the subsegment's sampled flag to false.

This ensures that downstream calls are not sampled and this subsegment is not emitted.



```go

import (

    "context"

    "fmt"

    "github.com/aws/aws-lambda-go/events"

    "github.com/aws/aws-lambda-go/lambda"

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

    "github.com/aws/aws-sdk-go/service/sqs"

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

)



func HandleRequest(ctx context.Context, event events.SQSEvent) (string, error) {

    _, subseg := xray.BeginSubsegmentWithoutSampling(ctx, "Processing Event")



    sess := session.Must(session.NewSessionWithOptions(session.Options{

        SharedConfigState: session.SharedConfigEnable,

    }))



    svc := sqs.New(sess)



    result, _ := svc.ListQueues(nil)



    for _, url := range result.QueueUrls {

        fmt.Printf("%s\n", *url)

    }



    subseg.Close(nil)



    return "Success", nil

}



func main() {

    lambda.Start(HandleRequest)

}

```



The code below demonstrates overriding the sampled flag based on the SQS messages sent to Lambda.



```go

import (

    "context"

    "fmt"

    "strconv"

    "github.com/aws/aws-lambda-go/events"

    "github.com/aws/aws-lambda-go/lambda"

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

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

)



func HandleRequest(ctx context.Context, event events.SQSEvent) (string, error) {



    var i = 1



    for _, message := range event.Records {

        var subseg *xray.Segment



        if xrayLambda.IsSampled(message) {

            _, subseg = xray.BeginSubsegment(ctx, "Processing Message - " + strconv.Itoa(i))

        } else {

            _, subseg = xray.BeginSubsegmentWithoutSampling(ctx, "Processing Message - " + strconv.Itoa(i))

        }



        i++;



        // Do your procesing work here

        fmt.Println("Doing processing work")



        // End your subsegment

        subseg.Close(nil)

    }



    return "Success", nil

}



func main() {

    lambda.Start(HandleRequest)

}

```



## License



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