winston-raven-sentry

The maintained and well-documented Raven/Sentry transport for the winston logger with support for Koa/Express/Passport.

This was designed as a complete and feature-packed drop-in replacement for 15+ unmaintained and poorly documented packages on NPM for sentry and raven winston loggers... such as winston-sentry, winston-raven, sentry-logger, etc.

Index

• Install
• Usage
• How to use with Koa/Express/Passport?
  • Koa Example
  • Express Example
• Options
  • Default Raven Options
  • Default Error Handler
  • Uncaught Exceptions
  • Unhandled Promise Rejections
  • Log Level Mapping
  • Custom Attributes
• Automatic Extra Error Object
• Recommended Logging Approach
• License

Install

npm install --save winston winston-raven-sentry

Usage

You can configure winston-raven-sentry in two different ways.

With new winston.Logger:

const winston = require('winston');
const Sentry = require('winston-raven-sentry');

const options = {
  dsn: 'https://******@sentry.io/12345',
  level: 'info'
};

const logger = new winston.Logger({
  transports: [
    new Sentry(options)
  ]
});

Or with winston's add method:

const winston = require('winston');
const Sentry = require('winston-raven-sentry');

const logger = new winston.Logger();

logger.add(Sentry, options);

See Options below for custom configuration.

How to use with Koa/Express/Passport?

Do you want to log your user objects along with every log automatically?

If so, we can simply use custom middleware to bind a logger method on the ctx object in Koa, or the req object in Express.

This example implementation assumes that you're using the standard Passport implementation and that the logged-in user object is set to ctx.state.user for Koa or req.user for Express. This is the standard usage, so you should have nothing to worry about!

If you need to whitelist only certain fields from ctx.state.user or req.user (e.g. don't send your passwords to it) then you need to specify the option parseUser through options.config.parseUser as documented here https://docs.sentry.io/clients/node/config/. The default fields whitelisted are [ 'id', 'username', 'email' ]. If you specify options.config.parseUser: true then all keys will be collected. If you specify false then none will be collected.

Koa Example

const winston = require('winston');
const Sentry = require('winston-raven-sentry');
const Koa = require('koa');
const passport = require('koa-passport');
const _ = require('lodash');

const app = new Koa();
const logger = new winston.Logger();

logger.add(Sentry, {
  // ...
});

app.use(passport.initialize());

app.use(logger.transports.sentry.raven.requestHandler(true));

app.on('error', function(err, ctx) {
  logger.error(err);
});

app.listen(3000);

Log an error or info message with req.logger:

app.use(async function(ctx, next) {
  try {
    const post = await Post.create({ message: 'hello world' });
    logger.info('post created', { extra: post });
    ctx.body = post;
  } catch (err) {
    ctx.throw(err);
    // or you could also do `logger.error(err);`,
    // but it's redundant since `app.emit('error')`
    // will get invoked when `ctx.throw` occurs in the app
  }
});

Express Example

const winston = require('winston');
const Sentry = require('winston-raven-sentry');
const express = require('express');
const passport = require('passport');
const _ = require('lodash');

const app = new express();
const logger = new winston.Logger();

logger.add(Sentry, {
  // ...
});

// define this first before all else
app.use(logger.transports.sentry.raven.requestHandler());

app.use(passport.initialize());

app.get('/', function(req, res, next) {
  throw new Error('oops!');
});

// keep this before all other error handlers
app.use(logger.transports.sentry.raven.errorHandler());

app.listen(3000);

Log an error or info message with req.logger:

app.use(async function(req, res, next) {
  try {
    const post = await Post.create({ message: 'hello world' });
    logger.info('post created', { extra: post });
    res.send(post);
  } catch (err) {
    logger.error(err);
    next(err);
  }
});

Options (options)

Per options variable above, here are the default options provided:

Default Sentry options:

• dsn (String) - your Sentry DSN or Data Source Name (defaults to process.env.SENTRY_DSN)
• config (Object) - a Raven configuration object (see Default Raven Options below)
• install (Boolean) - automatically catches uncaught exceptions through Raven.install if set to true (defaults to false)
• errorHandler (Function) - a callback function to use for logging Raven errors (e.g. an invalid DSN key). This defaults to logging the err.message, see Default Error Handler below... but if you wish to disable this just pass errorHandler: false. If there is already an error listener then this function will not get bound.
• raven (Object) - an optional instance of Raven that is already configured via Raven.config (if provided this will be used instead of the config option

Transport related options:

• name (String) - transport's name (defaults to sentry)
• silent (Boolean) - suppress logging (defaults to false)
• level (String) - transport's level of messages to log (defaults to info)
• levelsMap (Object) - log level mapping to Sentry (see Log Level Mapping below)

Default Raven Options (options.config)

• logger (String) - defaults to winston-raven-sentry
• captureUnhandledRejections (Boolean) - defaults to false
• culprit (String) - defaults to the module or function name
• server_name (String) - defaults to process.env.SENTRY_NAME or os.hostname()
• release (String) - defaults to process.env.SENTRY_RELEASE (see #343 if you'd like to have the git hash or package version as the default)
• tags (Array or Object) - no default value
• environment (String) - defaults to process.env.SENTRY_ENVIRONMENT (see #345 if you'd like to have this default to process.env.NODE_ENV instead)
• modules (Object) - defaults to package.json dependencies
• extra (Object) - no default value
• fingerprint (Array) - no default value

For a full list of Raven options, please visit https://docs.sentry.io/clients/node/config/.

Default Error Handler (options.errorHandler)

The default error handler is a function that is simply:

function errorHandler(err) {
  console.error(err.message);
}

... and it is binded to the event emitter:

Raven.on('error', this.options.errorHandler);

Therefore if you have specified an invalid DSN key, then you will see its output on the command line.

For example:

[email protected] alert: failed to send exception to sentry: HTTP Error (401): Invalid api key
HTTP Error (401): Invalid api key

If you pass options.errorHandler: false then no error handler will be binded.

Uncaught Exceptions

If you want to log uncaught exceptions with Sentry, then specify install: true in options:

new Sentry({
  install: true
});

Unhandled Promise Rejections

If you want to log unhandled promise rejections with Sentry, then specify captureUnhandledRejections: true in options.config:

new Sentry({
  config: {
    captureUnhandledRejections: true
  }
});

Log Level Mapping

Winston logging levels are mapped by default to Sentry's acceptable levels.

These defaults are set as `options.levelsMap' and are:

{
  silly: 'debug',
  verbose: 'debug',
  info: 'info',
  debug: 'debug',
  warn: 'warning',
  error: 'error'
}

You can customize how log levels are mapped using the levelsMap option:

new Sentry({
  levelsMap: {
    verbose: 'info'
  }
});

If no log level mapping was found for the given level passed, then it will not log anything.

Custom Attributes

If you need to log custom attributes, such as extra, user, or tags attributes, specify them in the meta object.

For example:

logger.info('Something happened', {
  user: {
    id: '123'
  },
  extra: {
    foo: 'bar'
  },
  tags: {
    git_commit: 'c0deb10c4'
  }
});

Automatic Extra Error Object

By default, if you provide an Error instance to either the msg or meta arguments to logger[level](msg, meta), then this package will automatically set meta.extra.err for you as follows:

meta.extra.err = {
  stack: err.stack,
  message: err.message
}

This ensures that your stack trace and error message are visible and saved to Sentry.

Furthermore, if msg was an Error object, then we will automatically set msg = msg.message.

This will prevent you from receiving the following message in Sentry:

Recommended Logging Approach

Compared to packages such as winston-sentry and winston-raven, we log messages to Sentry more accurately using captureMessage and captureException (and take into consideration Error instances). There was a core bug in all other similar packages on NPM that did not pass along the log level properly, therefore it was refactored and also built to the standards of raven itself (e.g. we utilize the defaults that they also do, see above options).

Here are a few examples provided below for how we recommend logging:

Log an error with stack trace (uses Raven.captureException):

logger.error(new Error('something happened'));

Note that this will automatically set extra.err.message = "something happened" and provide the stack trace as extra.err.stack.

Log an error message (uses Raven.captureException - don't worry as this method automatically turns the message below into an Error instance for us):

logger.error('something happened');

Note that this will automatically set extra.err.message = "something happened" and provide the stack trace as extra.err.stack.

Log an error with stack trace and extra data (uses Raven.captureException):

logger.error(new Error('something happened'), {
  extra: {
    foo: 'bar'
  }
});

Note that this will automatically set extra.err.message = "something happened" and provide the stack trace as extra.err.stack.

Log an error with stack trace, extra data, and the user that it occurred to (uses Raven.captureException):

logger.error(new Error('something happened'), {
  user: {
    id: '123',
    email: '[email protected]',
    username: 'niftylettuce'
  },
  extra: {
    foo: 'bar'
  }
});

Note that this will automatically set extra.err.message = "something happened" and provide the stack trace as extra.err.stack.

Log a message (uses Raven.captureMessage):

logger.info('hello world');

Log a message and extra data (uses Raven.captureMessage):

logger.info('hello world', {
  extra: {
    foo: 'bar'
  }
});

Log a message and tags (uses Raven.captureMessage):

logger.info('hello world', {
  tags: {
    component: 'api'
  }
});

License

MIT License