trycatch

An asynchronous domain-based exception handler with long stack traces for node.js

  • Owner: CrabDude/trycatch
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  • License:: MIT License
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trycatch

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A domain-based asynchronous try/catch with (optional) long stack traces for node.js optimized for V8.

WARNING: trycatch replaces the built-in global Error object.

Install

npm install trycatch

Use

var trycatch = require('trycatch')
trycatch(function() {
  // do something error-prone
}, function(err) {
  console.log(err.stack);
})

Returning 500s on Server Request

http.createServer(function(req, res) {
  trycatch(function() {
    setTimeout(function() {
      throw new Error('Baloney!');
    }, 1000);
  }, function(err) {
    res.writeHead(500);
    res.end(err.stack);
  });
}).listen(8000);

Visit http://localhost:8000 and get your 500.

Options

Optional Long-Stack-Traces:

// Because trycatch shims all native I/O calls,
// it must be required & configured with 'long-stack-traces' before any other modules.
var trycatch = require('trycatch')
trycatch.configure({'long-stack-traces': true})
trycatch(fnTry, fnCatch)

Colors:

var trycatch = require('trycatch')
trycatch.configure({
  colors: {
    // 'none' or falsy values will omit
    'node': 'none',
    'node_modules': false,
    'default': 'yellow'
  }
})
trycatch(fnTry, fnCatch)

Advanced Formatting:

var trycatch = require('trycatch')
trycatch.configure({
  format: function(line) {
    // Alter final output (falsy values will omit)
    return line
  }
})
trycatch(fnTry, fnCatch)

Basic Example

var trycatch = require("trycatch"),
  _ = require('underscore')._

  trycatch(function() {
  _.map(['Error 1', 'Error 2'], function foo(v) {
    setTimeout(function() {
      throw new Error(v)
    }, 10)
  })
}, function(err) {
  console.log("Async error caught!\n", err.stack);
});

Output

Advanced Examples

See the /test and examples directories for more use cases.

uncaughtApplicationException

trycatch effectively wraps all application callbacks in try/catch blocks, preventing an exception in your application code from causing code in core to not execute. Effectively, this means that exceptions originating in application code that normally would be passed as uncaughtException, can instead be handled via uncaughtApplicationException without requiring a restart:

process.on('uncaughtApplicationException', (err) => console.log(err.stack))

process.on('uncaughtException', (err) => {
  console.log(err.stack)
  // We are in an undefined state and need to restart
  handleSoftShutodwn()
})

Main metrics

Overview
Name With OwnerCrabDude/trycatch
Primary LanguageJavaScript
Program languageJavaScript (Language Count: 2)
Platform
License:MIT License
所有者活动
Created At2011-09-27 22:37:33
Pushed At2020-07-15 19:50:12
Last Commit At2019-12-10 14:23:30
Release Count54
Last Release Namev1.5.11 (Posted on 2014-04-04 18:06:42)
First Release Namev0.1.1 (Posted on 2012-11-08 17:51:26)
用户参与
Stargazers Count245
Watchers Count14
Fork Count17
Commits Count214
Has Issues Enabled
Issues Count41
Issue Open Count7
Pull Requests Count8
Pull Requests Open Count2
Pull Requests Close Count4
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Has Wiki Enabled
Is Archived
Is Fork
Is Locked
Is Mirror
Is Private