diff --git a/dylan-testing/common/http-sockets.js b/dylan-testing/common/http-sockets.js new file mode 100644 index 0000000000000000000000000000000000000000..93f3623a94fefecfa46ce7a3f7d11f54308107b1 --- /dev/null +++ b/dylan-testing/common/http-sockets.js @@ -0,0 +1,127 @@ +var fs = require("fs"); +var http = require("http"); +var net = require("net"); + +module.exports = { + HttpSocketServer: HttpSocketServer, + createServer: createServer, + proxy: proxy +}; + +/** + * A thin wrapper around http.Server with a modified .listen() method that + * will perservere on an EADDRINUSE error, and attempt to clean up any + * abandoned sockets that are encountered, before attempting to .listen() + * again. If such a socket is encountered and is not abandoned, but is + * instead being used, then .listen() will not try to delete it. + * + * @param {function} requestListener - see documentation for http.Server + * @return {HttpSocketServer} + */ +function HttpSocketServer(requestListener){ + if(!this instanceof HttpSocketServer) return new HttpSocketServer; + http.Server.call(this, requestListener); +} +HttpSocketServer.prototype = Object.create(http.Server.prototype); + +/** + * Identical to http.Server.prototype.listen (the IPC/socket variant), except + * that it will delete path if it is an abandoned socket, and then reattempt + * to listen. + * + * @param {string} path - the path to place the socket file + * @param {number} backlog - see http.Server.listen documentation + * @param {function} callback - see http.Server.listen documentation + * @return this {HttpSocketServer} + */ +HttpSocketServer.prototype.listen = function listen(path, backlog, callback){ + var _this = this; + + // If the socket already exists, see if it is being used, and if it isn't, + // delete it and retry listening. If it is being used, then give up and + // wait for the next manual invocation of .listen + this.once("error", function(e){ + if(e.code == "EADDRINUSE"){ + var connTest = new net.Socket(); + + // Socket was abandoned, delete it then retry .listen + connTest.on("error", function(e){ + connTest.destroy(); + + console.warn("Deleting abandoned socket \""+path+"\""); + fs.unlinkSync(path); + + HttpSocketServer.prototype.listen.call( + _this, path, backlog, callback + ); + }); + + // Socket in use, give up + connTest.on("connect", function(){ + connTest.destroy(); + e.message = + "Could not start server. Socket \""+path + +"\" exists and is in use" + ; + _this.emit("error", e); + }); + connTest.connect(path); + } + else this.emit("error", e); + }); + + return http.Server.prototype.listen.call(this, path, backlog, callback); +} + +/** + * A shortcut for new HttpSocketSerer to mirror NodeJS's http API + * + * @param {function} requestListener - see http.createServer documentation + * @return {HttpSocketServer} + */ +function createServer(requestListener){ + return new HttpSocketServer(requestListener); +} + + +/** + * Creates a new middleware for express that proxies all HTTP requests to the + * specified UNIX domain socket. + * + * @param {string} socketPath - the path to the socket + * @return {function} - an express middleware function + */ +function proxy(socketPath){ + return function socketProxyMiddleware(req, res, next){ + fs.stat(socketPath, function(err, stats){ + // Check that we can actually open the socket, + // and that it's a socket + try { + if(err) throw err; + if(!stats.isSocket()) throw new Error("Not a socket"); + } + catch(e){ + res.status(500).end(); + console.error( + "Error proxying to socket \"" + socketPath + "\": " + + e.message + ); + return; + } + + // Initiate HTTP request to proxy target + var reqOpts = { + socketPath: socketPath, + method: req.method, + path: req.path, + headers: req.headers + }; + var target = http.request(reqOpts, function onResponse(targetRes){ + res.writeHead(targetRes.statusCode, targetRes.headers); + targetRes.pipe(res); + // .pipe() will automatically call res.end() + }); + req.pipe(target); + }); + }; +} diff --git a/dylan-testing/common/socket-proxy.js b/dylan-testing/common/socket-proxy.js deleted file mode 100644 index bb91afa31a7b1eab0c350463d44cbf1277f9d352..0000000000000000000000000000000000000000 --- a/dylan-testing/common/socket-proxy.js +++ /dev/null @@ -1,44 +0,0 @@ -var fs = require("fs"); - -/** - * Creates a new middleware for express that proxies all requests to the - * specified UNIX domain socket. - * - * @param {string} socketPath - the path to the socket - * @return {function} - an express middleware function - */ -module.exports = function socketProxy(socketPath){ - return function socketProxyMiddleware(req, res, next){ - fs.stat(socketPath, function(err, stats){ - // Check that we can actually open the socket, - // and that it's a socket - try { - if(err) throw err; - if(!stats.isSocket()) throw new Error("Not a socket"); - } - catch(e){ - res.status(500).end(); - console.error( - "Error proxying to socket \"" + socketPath + "\": " - + e.message - ); - return; - } - - // Initiate HTTP request to proxy target - var reqOpts = { - socketPath: socketPath, - method: req.method, - path: req.path, - headers: req.headers - }; - var target = http.request(reqOpts, function onResponse(targetRes){ - res.writeHead(targetRes.statusCode, targetRes.headers); - targetRes.pipe(res); - // .pipe() will automatically call res.end() - }); - req.pipe(target); - }); - }; -} - diff --git a/dylan-testing/core/login-service.js b/dylan-testing/core/login-service.js index fcbc2410a70af0686e7b840e30447392357c6e71..ef42e9b9957d17decee89ff8cb1489e0928a4ad4 100644 --- a/dylan-testing/core/login-service.js +++ b/dylan-testing/core/login-service.js @@ -1,19 +1,19 @@ var express = require("express"); +var http = require("http"); var fs = require("fs"); -var config; -var app; +var httpSockets = require("common/http-sockets"); +var config = require("common/config"); +var app = express(); +var server; -function main(){ - // Read in config from environment - config = JSON.parse(process.env.UCCPORTAL_CONFIG); - - app = express(); - app.get("/", function(req, res){ - res.write("Hello World!"); - res.end(); - }); +// Set up routes +app.get("/", function(req, res){ + res.write("Hello World!"); + res.end(); +}); - app.listen(config.varPath + "/login-service.sock"); -} -main(); +// Create server, start it, and make sure it gracefully shuts down +// when this service gets terminated +server = httpSockets.createServer(app); +server.listen(config.varPath + "/login-service.sock"); diff --git a/dylan-testing/core/web-service.js b/dylan-testing/core/web-service.js index cef2e70bf379de11e870921ca6f5e6b1e272baff..f7d55d6869cc42421ed39b23cbaffeb225490310 100644 --- a/dylan-testing/core/web-service.js +++ b/dylan-testing/core/web-service.js @@ -1,8 +1,8 @@ var express = require("express"); var http = require("http"); var fs = require("fs"); -var config = require("common/config.js"); -var socketProxy = require("common/socket-proxy.js"); +var config = require("common/config"); +var httpSockets = require("common/http-sockets"); var config; var app; @@ -10,7 +10,7 @@ var app; function main(){ // Set up express app and routes app = express(); - app.use("/login", socketProxy(config.varPath + "/login-service.sock")); + app.use("/login", httpSockets.proxy(config.varPath + "/login-service.sock")); // Start web server or crash console.info( diff --git 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