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README.md

Honeybadger for Go

Build Status

Go (golang) support for the Honeybadger error notifier. Receive instant notification of panics and errors in your Go applications.

Getting Started

1. Install the library

To install, grab the package from GitHub:

go get github.com/honeybadger-io/honeybadger-go

Then add an import to your application code:

import "github.com/honeybadger-io/honeybadger-go"

2. Set your API key

Finally, configure your API key:

honeybadger.Configure(honeybadger.Configuration{APIKey: "your api key"})

You can also configure Honeybadger via environment variables. See Configuration for more information.

3. Enable automatic panic reporting

Panics during HTTP requests

To automatically report panics which happen during an HTTP request, wrap your http.Handler function with honeybadger.Handler:

log.Fatal(http.ListenAndServe(":8080", honeybadger.Handler(handler)))

Request data such as cookies and params will automatically be reported with errors which happen inside honeybadger.Handler. Make sure you recover from panics after honeybadger's Handler has been executed to ensure all panics are reported.

Unhandled Panics

To report all unhandled panics which happen in your application the following can be added to main():

func main() {
  defer honeybadger.Monitor()
  // application code...
}

Manually Reporting Errors

To report an error manually, use honeybadger.Notify:

if err != nil {
  honeybadger.Notify(err)
}

Sample Application

If you'd like to see the library in action before you integrate it with your apps, check out our sample application.

You can deploy the sample app to your Heroku account by clicking this button:

Deploy

Don't forget to destroy the Heroku app after you're done so that you aren't charged for usage.

The code for the sample app is available on Github, in case you'd like to read through it, or run it locally.

Configuration

To set configuration options, use the honeybadger.Configuration method, like so:

honeybadger.Configure(honeybadger.Configuration{
  APIKey: "your api key",
  Env: "staging"
})

The following options are available to you:

Name Type Default Example Environment variable
APIKey string "" "badger01" HONEYBADGER_API_KEY
Root string The current working directory "/path/to/project" HONEYBADGER_ROOT
Env string "" "production" HONEYBADGER_ENV
Hostname string The hostname of the current server. "badger01" HONEYBADGER_HOSTNAME
Endpoint string "https://api.honeybadger.io" "https://honeybadger.example.com/" HONEYBADGER_ENDPOINT
Sync bool false true HONEYBADGER_SYNC
Timeout time.Duration 3 seconds 10 * time.Second HONEYBADGER_TIMEOUT (nanoseconds)
Logger honeybadger.Logger Logs to stderr CustomLogger{} n/a
Backend honeybadger.Backend HTTP backend CustomBackend{} n/a

Public Interface

honeybadger.Notify(): Send an error to Honeybadger.

If you've handled a panic in your code, but would still like to report the error to Honeybadger, this is the method for you.

Examples:

if err != nil {
  honeybadger.Notify(err)
}

You can also add local context using an optional second argument when calling honeybadger.Notify:

honeybadger.Notify(err, honeybadger.Context{"user_id": 2})

Honeybadger uses the error's class name to group similar errors together. If your error classes are often generic (such as errors.errorString), you can improve grouping by overriding the default with something more unique:

honeybadger.Notify(err, honeybadger.ErrorClass{"CustomClassName"})

To override grouping entirely, you can send a custom fingerprint. All errors with the same fingerprint will be grouped together:

honeybadger.Notify(err, honeybadger.Fingerprint{"A unique string"})

To tag errors in Honeybadger:

honeybadger.Notify(err, honeybadger.Tags{"timeout", "http"})

honeybadger.SetContext(): Set metadata to be sent if an error occurs

This method lets you set context data that will be sent if an error should occur.

For example, it's often useful to record the current user's ID when an error occurs in a web app. To do that, just use SetContext to set the user id on each request. If an error occurs, the id will be reported with it.

Note: This method is currently shared across goroutines, and therefore may not be optimal for use in highly concurrent use cases, such as HTTP requests. See issue #35.

Examples:

honeybadger.SetContext(honeybadger.Context{
  "user_id": 1,
})

defer honeybadger.Monitor(): Automatically report panics from your functions

To automatically report panics in your functions or methods, add defer honeybadger.Monitor() to the beginning of the function or method you wish to monitor.

Examples:

func risky() {
  defer honeybadger.Monitor()
  // risky business logic...
}

Important: honeybadger.Monitor() will re-panic after it reports the error, so make sure that it is only called once before recovering from the panic (or allowing the process to crash).


honeybadger.BeforeNotify(): Add a callback to skip or modify error notification.

Sometimes you may want to modify the data sent to Honeybadger right before an error notification is sent, or skip the notification entirely. To do so, add a callback using honeybadger.BeforeNotify().

Examples:

honeybadger.BeforeNotify(
  func(notice *honeybadger.Notice) error {
    if notice.ErrorClass == "SkippedError" {
      return fmt.Errorf("Skipping this notification")
    }
    // Return nil to send notification for all other classes.
    return nil
  }
)

To modify information:

honeybadger.BeforeNotify(
  func(notice *honeybadger.Notice) error {
    // Errors in Honeybadger will always have the class name "GenericError".
    notice.ErrorClass = "GenericError"
    return nil
  }
)

honeybadger.NewNullBackend(): Disable data reporting.

NewNullBackend creates a backend which swallows all errors and does not send them to Honeybadger. This is useful for development and testing to disable sending unnecessary errors.

Examples:

honeybadger.Configure(honeybadger.Configuration{Backend: honeybadger.NewNullBackend()})

Creating a new client

In the same way that the log library provides a predefined "standard" logger, honeybadger defines a standard client which may be accessed directly via honeybadger. A new client may also be created by calling honeybadger.New:

hb := honeybadger.New(honeybadger.Configuration{APIKey: "some other api key"})
hb.Notify("This error was reported by an alternate client.")

Grouping

Honeybadger groups by the error class and the first line of the backtrace by default. In some cases it may be desirable to provide your own grouping algorithm. One use case for this is errors.errorString. Because that type is used for many different types of errors in Go, Honeybadger will appear to group unrelated errors together. Here's an example of providing a custom fingerprint which will group errors.errorString by message instead:

honeybadger.BeforeNotify(
  func(notice *honeybadger.Notice) error {
    if notice.ErrorClass == "errors.errorString" {
      notice.Fingerprint = notice.Message
    }
    return nil
  }
)

Note that in this example, the backtrace is ignored. If you want to group by message and backtrace, you could append data from notice.Backtrace to the fingerprint string.

An alternate approach would be to override notice.ErrorClass with a more specific class name that may be inferred from the message.

Sync Mode

By default, we send out all notices via a separate worker goroutine. This is awesome for long running applications as it keeps Honeybadger from blocking during execution. However, this can be a problem for short running applications (lambdas, for example) as the program might terminate before all messages are processed. To combat this, you can configure Honeybadger to work in "Sync" mode which blocks until notices are sent when honeybadger.Notify is executed. You can enable sync mode by setting the HONEYBADGER_SYNC environment variable or updating the config:

honeybadger.Configure(honeybadger.Configuration{Sync: true})

"Sync" mode is most useful for situations when you are not sending the notice directly. If you are sending them directly and you want the same functionality, you can call honeybadger.Flush after sending the Notice to block until the worker has completed processing.

honeybadger.Notify("I errored.")
honeybadger.Flush()

Versioning

We use Semantic Versioning to version releases of honeybadger-go. Because there is no official method to specify version dependencies in Go, we will do our best never to introduce a breaking change on the master branch of this repo after reaching version 1. Until we reach version 1 there is a small chance that we may introduce a breaking change (changing the signature of a function or method, for example), but we'll always tag a new minor release and broadcast that we made the change.

If you're concerned about versioning, there are two options:

Vendor your dependencies

If you're really concerned about changes to this library, then copy it into your source control management system so that you can perform upgrades on your own time.

Use gopkg.in

Rather than importing directly from GitHub, gopkg.in allows you to use their special URL format to transparently import a branch or tag from GitHub. Because we tag each release, using gopkg.in can enable you to depend explicitly on a certain version of this library. Importing from gopkg.in instead of directly from GitHub is as easy as:

import "gopkg.in/honeybadger-io/honeybadger-go.v0"

Check out the gopkg.in homepage for more information on how to request versions.

Changelog

See https://github.com/honeybadger-io/honeybadger-go/blob/master/CHANGELOG.md

Contributing

If you're adding a new feature, please submit an issue as a preliminary step; that way you can be (moderately) sure that your pull request will be accepted.

To contribute your code:

  1. Fork it.
  2. Create a topic branch git checkout -b my_branch
  3. Commit your changes git commit -am "Boom"
  4. Push to your branch git push origin my_branch
  5. Send a pull request

Releasing

  1. Update VERSION in honeybadger.go
  2. Include version in CHANGELOG.md
  3. Commit release and push tag with release version

License

This library is MIT licensed. See the LICENSE file in this repository for details.

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