Problems: 1) When some files changed, needs to restart for applying that. 2) When application downed, needs to start it again
I found some external utils: a) nodemon https://github.com/remy/nodemon Transparent node-replacer. This is really cool util for (1) but not for (2) b) supervisor https://github.com/isaacs/node-supervisor Node-replacer, but do not transmit cmd arguments to node. This is important for me because i need --harmony flag. c) forever https://github.com/nodejitsu/forever Solving (2) problem, but not (1) d) some modules for hot-swapping, but without native api, it is dangerous. Of course, i can use nodemon+forever, but this is overkill. Daemon that monitoring daemon that monitoring application.. And i invent new one :) $.jin.persistent - node module that integrates in your application, and keeps it up and up-to-date. Let us write something simple: ================================================ require( 'jin' ).persistent( function( $ ){ // $ is autoloader but you are not required to use it console.log( '2 * 2 = ' + 2 * 2 ) if( Math.random() < 0.3 ) throw new Error( 'Something wrong!' ) } ) ================================================ In console you see something like that while you editing the source: ================================================ >node --harmony . $.jin.persistent: Starting application... 2 * 2 = 4 $.jin.persistent: Some files changed! $.jin.persistent: Starting application... 2 * 2 = 4 $.jin.persistent: Some files changed! $.jin.persistent: Starting application... 2 * 2 = 4 Error: Something Wrong! at \index.js:5:37 at module.exports.$.jin.proxy.apply.proc (\node_modules\jin\sync2async.js:19:18) $.jin.persistent: Application halted (1) $.jin.persistent: Some files changed! $.jin.persistent: Starting application... 2 * 2 = 4 ================================================ Note, application did not restart after this error, because it fails on statup and strongly needs for changes for starting again. Autorestart enables after 1s timeout. Let us write some server. Let it be service that gets domain list and returns json with its ip's as integers. ================================================ require( 'jin' ).persistent( function( $ ){ $.express() .use( $.jin.sync2middle( function( req, res ){ var domains= req.url.replace( /^\/+|\/+$/g, '' ).split( '/' ).map( decodeURIComponent ) var ips= domains.map( function( domain ){ return $.dns.lookupSync( domain ) } ) var map= {} domains.forEach( function( domain, index ){ try{ numbers= String( ips[ index ] ).split( '.' ).map( Number ) map[ domain ]= numbers[ 0 ] * 256 * 256 * 256 + numbers[ 1 ] * 256 * 256 + numbers[ 2 ] * 256 + numbers[ 3 ] } catch( error ){ map[ domain ]= error } } ) return map } ) ) .listen( 80 ) } ) ================================================ This is implementation of map-reduce pattern. First,simultaneously send requests to dns. Second, gets responses in right sequence, and handle all errors occurring during that. I run that application by: npm install jin node --harmony dns-er.js While i write this source, server has automatic restarts. And sometimes server downs with any error. But when i fix bugs it ups automatically. All i do after editing is refreshing this page: http://localhost/google.com/undefined.host/yandex.com/%D0%BF%D1%80%D0%B5%D0%B7%D0%B8%D0%B4%D0%B5%D0%BD%D1%82.%D1%80%D1%84/ and getting that in browser: ================================================ { - google.com: 1249765070, - undefined.host: { - code: "ENOTFOUND", - errno: "ENOTFOUND", - syscall: "getaddrinfo" }, - yandex.com: 1680561923, - президент.рф: 3285194843 } ================================================ $.jin.persistent uses fs-watch-tree and you can setup this watcher by optional second argument that passes as is. By default watched all files and directories that starts with english letter. See more about this config: https://github.com/busterjs/fs-watch-tree#watchtreedir-options-callback And more about jin library: https://github.com/nin-jin/node-jin -- Job Board: http://jobs.nodejs.org/ Posting guidelines: https://github.com/joyent/node/wiki/Mailing-List-Posting-Guidelines You received this message because you are subscribed to the Google Groups "nodejs" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nodejs?hl=en?hl=en
