Sentry Middleware for Redux

Logs the type of each dispatched action to Sentry as "breadcrumbs" and attaches your last action and current Redux state as additional context.

It's a rewrite of raven-for-redux but with new Sentry unified APIs.

Installation

npm install --save redux-sentry-middleware

Usage

// store.js

import * as Sentry from "@sentry/browser"; 
// For usage with node 
// import * as Sentry from "@sentry/node";

import { createStore, applyMiddleware } from "redux";
import createSentryMiddleware from "redux-sentry-middleware";

import { reducer } from "./my_reducer";

Sentry.init({
  dsn: '<your dsn>'
});

export default createStore(
    reducer,
    applyMiddleware(
        // Middlewares, like `redux-thunk` that intercept or emit actions should
        // precede `redux-sentry-middleware`.
        createSentryMiddleware(Sentry, {
            // Optionally pass some options here.
        })
    )
);

API: createSentryMiddleware(Sentry, [options])

Arguments

• Sentry (Sentry Object): A configured and "installed" [Sentry] object.
• [options] (Object): See below for detailed documentation.

Options

While the default configuration should work for most use cases, middleware can be configured by providing an options object with any of the following optional keys.

breadcrumbDataFromAction (Function)

Default: action => undefined

Sentry allows you to attach additional context information to each breadcrumb in the form of a data object. breadcrumbDataFromAction allows you to specify a transform function which is passed the action object and returns a data object. Which will be logged to Sentry along with the breadcrumb.

Ideally we could log the entire content of each action. If we could, we could perfectly replay the user's entire session to see what went wrong.

However, the default implementation of this function returns undefined, which means no data is attached. This is because there are a few gotchas:

• The data object must be "flat". In other words, each value of the object must be a string. The values may not be arrays or other objects.
• Sentry limits the total size of your error report. If you send too much data, the error will not be recorded. If you are going to attach data to your breadcrumbs, be sure you understand the way it will affect the total size of your report.

Finally, be careful not to mutate your action within this function.

See the Sentry [Breadcrumb documentation].

actionTransformer (Function)

Default: action => action

In some cases your actions may be extremely large, or contain sensitive data. In those cases, you may want to transform your action before sending it to Sentry. This function allows you to do so. It is passed the last dispatched action object, and should return a serializable value.

Be careful not to mutate your action within this function.

If you have specified a [beforeSend] when you configured Sentry, note that actionTransformer will be applied before your specified beforeSend.

stateTransformer (Function)

Default: state => state

In some cases your state may be extremely large, or contain sensitive data. In those cases, you may want to transform your state before sending it to Sentry. This function allows you to do so. It is passed the current state object, and should return a serializable value.

Be careful not to mutate your state within this function.

If you have specified a [beforeSend] when you configured Raven, note that stateTransformer will be applied before your specified beforeSend.

breadcrumbCategory (String)

Default: "redux-action"

Each breadcrumb is assigned a category. By default all action breadcrumbs are given the category "redux-action". If you would prefer a different category name, specify it here.

filterBreadcrumbActions (Function)

Default: action => true

If your app has certain actions that you do not want to send to Sentry, pass a filter function in this option. If the filter returns a truthy value, the action will be added as a breadcrumb, otherwise the action will be ignored. Note: even when the action has been filtered out, it may still be sent to Sentry as part of the extra data, if it was the last action before an error.

getUserContext (Optional Function)

Signature: state => userContext

Sentry allows you to associcate a [user context] with each error report. getUserContext allows you to define a mapping from your Redux state to the user context. When getUserContext is specified, the result of getUserContext will be used to derive the user context before sending an error report. Be careful not to mutate your state within this function.

If you have specified a [beforeSend] when you configured Raven, note that getUserContext will be applied before your specified beforeSend. When a getUserContext function is given, it will override any previously set user context.

getTags (Optional Function)

Signature: state => tags

Sentry allows you to associate [tags] with each report. getTags allows you to define a mapping from your Redux state to an object of tags (key → value). Be careful not to mutate your state within this function.

breadcrumbMessageFromAction (Function)

Default: action => action.type

breadcrumbMessageFromAction allows you to specify a transform function which is passed the action object and returns a string that will be used as the message of the breadcrumb.

By default breadcrumbMessageFromAction returns action.type.

Finally, be careful not to mutate your action within this function.

See the Sentry Breadcrumb documentation.