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Gobrake

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Introduction

Gobrake is the official notifier library for Airbrake for the Go programming language. Gobrake provides a minimalist API that enables the ability to send any Go error or panic to the Airbrake dashboard. The library is extremely lightweight, with minimal overhead.

Key features

  • Simple, consistent and easy-to-use library API
  • Asynchronous exception reporting
  • Flexible configuration options
  • Support for environments
  • Add extra context to errors before reporting them
  • Filters support (filter out sensitive or unwanted data that shouldn't be sent)
  • Ignore errors based on class, message, status, file, or any other filter
  • SSL support (all communication with Airbrake is encrypted by default)
  • Notify Airbrake on panics
  • Set error severity to control notification thresholds
  • Support for code hunks (lines of code surrounding each backtrace frame)
  • Automatic deploy tracking
  • Performance monitoring features such as HTTP route statistics, SQL queries, and Job execution statistics
  • Integrations with Beego, Gin and Negroni
  • Last but not least, we follow semantic versioning 2.0.0

Installation

Go modules

Gobrake can be installed like any other Go package that supports Go modules.

Installing in an existing project

Just go get the library:

go get github.com/airbrake/gobrake/v5

Installing in a new project

Create a new directory, initialize a new module and go get the library:

mkdir airbrake_example && cd airbrake_example
go mod init airbrake_example
go get github.com/airbrake/gobrake/v5

Example

This is the minimal example that you can use to test Gobrake with your project.

package main

import (
	"errors"

	"github.com/airbrake/gobrake/v5"
)

var airbrake = gobrake.NewNotifierWithOptions(&gobrake.NotifierOptions{
	ProjectId:   105138,
	ProjectKey:  "fd04e13d806a90f96614ad8e529b2822",
	Environment: "production",
})

func main() {
	defer airbrake.Close()

	airbrake.Notify(errors.New("operation failed"), nil)
}

Configuration

Configuration is done through the gobrake.NotifierOptions struct, which you are supposed to pass to gobrake.NewNotifierWithOptions.

airbrake := gobrake.NewNotifierWithOptions(&gobrake.NotifierOptions{
	ProjectId:   105138,
	ProjectKey:  "fd04e13d806a90f96614ad8e529b2822",
	Environment: "production",
})

NotifierOptions

ProjectId & ProjectKey

You must set both ProjectId & ProjectKey.

To find your ProjectId (int64) and ProjectKey (string) navigate to your project's Settings and copy the values from the right sidebar.

Environment

Configures the environment the application is running in. It helps Airbrake dashboard to distinguish between exceptions occurring in different environments. By default, it's not set. Expects string type.

opts := gobrake.NotifierOptions{
	Environment: "production",
}

Revision

Specifies current version control revision. If your app runs on Heroku, its value will be defaulted to SOURCE_VERSION environment variable. For non-Heroku apps this option is not set. Expects string type.

opts := gobrake.NotifierOptions{
	Revision: "d34db33f",
}

KeysBlocklist

Specifies which keys in the payload (parameters, session data, environment data, etc) should be filtered. Before sending an error, filtered keys will be substituted with the [Filtered] label.

By default, password and secret are filtered out. string and *regexp.Regexp types are permitted.

// String keys.
secrets := []string{"mySecretKey"}

// OR regexp keys
// secrets := []*regexp.Regexp{regexp.MustCompile("mySecretKey")}

blocklist := make([]interface{}, len(secrets))
for i, v := range secrets {
	blocklist[i] = v
}

opts := gobrake.NotifierOptions{
	KeysBlocklist: blocklist,
}

DisableCodeHunks

Controls code hunk collection. Code hunks are lines of code surrounding each backtrace frame. By default, it's set to false. Expects bool type.

opts := gobrake.NotifierOptions{
	DisableCodeHunks: true,
}

Host

By default, it is set to https://api.airbrake.io. A host (string) is a web address containing a scheme ("http" or "https"), a host and a port. You can omit the port (80 will be assumed) and the scheme ("https" will be assumed).

opts := gobrake.NotifierOptions{
	Host: "http://localhost:8080/api/",
}

HTTPClient

HTTP client that is used to send data to Airbrake API. Expects *http.Client type. Normally, you shouldn't configure it.

opts := gobrake.NotifierOptions{
	HTTPClient: &http.Client{
		Timeout: 10 * time.Second,
	},
}

DisableRemoteConfig

Configures the remote configuration feature. At regular intervals the notifier will be making GET requests to Airbrake servers and fetching a JSON document containing configuration settings of the notifier. The notifier will apply these new settings at runtime. By default, this option is set to false (the feature is enabled).

Note: it is not recommended to disable this feature. It might negatively impact how your notifier works. Please use this option with caution.

API

For complete API description please follow documentation on pkg.go.dev documentation.

AddFilter

AddFilter accepts a callback function which will be executed every time a gobrake.Notice is sent. You can use that for two purposes: filtering of unwanted or sensitive params or ignoring the whole notice completely.

Filtering unwanted params
// Filter out sensitive information such as credit cards.
airbrake.AddFilter(func(n *gobrake.Notice) *gobrake.Notice {
	if _, ok := n.Context["creditCard"] {
		n.Context["creditCard"] = "Filtered"
	}
	return n
})
Ignoring notices
// Ignore all notices in development.
airbrake.AddFilter(func(n *gobrake.Notice) *gobrake.Notice {
	if n.Context["environment"] == "development" {
		return nil
	}
	return n
})

Setting severity

Severity allows categorizing how severe an error is. By default, it's set to error. To redefine severity, simply overwrite context/severity of a notice object. For example:

notice := airbrake.NewNotice("operation failed", nil, 0)
notice.Context["severity"] = "critical"
airbrake.Notify(notice, nil)

Performance Monitoring

You can read more about our Performance Monitoring offering in our docs.

Sending routes stats

In order to collect routes stats you can instrument your application using notifier.Routes.Notify API.

Below is an example using the net/http middleware. We also have HTTP middleware examples for Gin, Beego and Negroni.

package main

import (
	"fmt"
	"net/http"

	"github.com/airbrake/gobrake"
)

// Airbrake is used to report errors and track performance
var Airbrake = gobrake.NewNotifierWithOptions(&gobrake.NotifierOptions{
	ProjectId:   <YOUR PROJECT ID>,				// <-- Fill in this value
	ProjectKey:  "<YOUR API KEY>", // <-- Fill in this value
	Environment: "production",
})

func indexHandler(w http.ResponseWriter, req *http.Request) {
	fmt.Fprintf(w, "Hello, There!")
}

func main() {
	fmt.Println("Server listening at http://localhost:5555/")
	// Wrap the indexHandler with Airbrake Performance Monitoring middleware:
	http.HandleFunc(airbrakePerformance("/", indexHandler))
	http.ListenAndServe(":5555", nil)
}

func airbrakePerformance(route string, h http.HandlerFunc) (string, http.HandlerFunc) {
	handler := http.HandlerFunc(func(w http.ResponseWriter, req *http.Request) {
	ctx := req.Context()
	ctx, routeMetric := gobrake.NewRouteMetric(ctx, req.Method, route) // Starts the timing
	arw := newAirbrakeResponseWriter(w)

	h.ServeHTTP(arw, req)

	routeMetric.StatusCode = arw.statusCode
	Airbrake.Routes.Notify(ctx, routeMetric) // Stops the timing and reports
	fmt.Printf("code: %v, method: %v, route: %v\n", arw.statusCode, req.Method, route)
	})

	return route, handler
}

type airbrakeResponseWriter struct {
	http.ResponseWriter
	statusCode int
}

func newAirbrakeResponseWriter(w http.ResponseWriter) *airbrakeResponseWriter {
	// Returns 200 OK if WriteHeader isn't called
	return &airbrakeResponseWriter{w, http.StatusOK}
}

func (arw *airbrakeResponseWriter) WriteHeader(code int) {
	arw.statusCode = code
	arw.ResponseWriter.WriteHeader(code)
}

To get more detailed timing you can wrap important blocks of code into spans. For example, you can create 2 spans sql and http to measure timing of specific operations:

metric := &gobrake.RouteMetric{
	Method: "GET",
	Route:	"/",
}

ctx, span := metric.Start(ctx, "sql")
users, err := fetchUser(ctx, userID)
span.Finish()

ctx, span = metric.Start(ctx, "http")
resp, err := http.Get("http://example.com/")
span.Finish()

metric.StatusCode = http.StatusOK
notifier.Routes.Notify(ctx, metric)

Sending queries stats

You can also collect stats about individual SQL queries performance using following API:

notifier.Queries.Notify(
	context.TODO(),
	&gobrake.QueryInfo{
		Query:	   "SELECT * FROM users WHERE id = ?", // query must be normalized
		Func:	   "fetchUser", // optional
		File:	   "models/user.go", // optional
		Line:	   123, // optional
		StartTime: startTime,
		EndTime:   time.Now(),
	},
)

Sending queue stats

metric := &gobrake.QueueMetric{
	Queue:   "my-queue-name",
	Errored: true,
}

ctx, span := metric.Start(ctx, "sql")
users, err := fetchUser(ctx, userID)
span.Finish()

ctx, span = metric.Start(ctx, "http")
resp, err := http.Get("http://example.com/")
span.Finish()

notifier.Queues.Notify(ctx, metric)

Additional notes

Exception limit

The maximum size of an exception is 64KB. Exceptions that exceed this limit will be truncated to fit the size.

Logging

There's a glog fork, which integrates with Gobrake. It provides all of original glog's functionality and adds the ability to send errors/logs to Airbrake.io.

Supported Go versions

The library supports Go v1.11+. The CI file would be the best source of truth because it contains all Go versions that we test against.

Contact

In case you have a problem, question or a bug report, feel free to:

License

The project uses the MIT License. See LICENSE.md for details.


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