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middleware.js
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middleware.js
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/*
MIT License http://www.opensource.org/licenses/mit-license.php
Author Tobias Koppers @sokra
*/
var MemoryFileSystem = require("memory-fs");
var mime = require("mime");
var HASH_REGEXP = /[0-9a-f]{10,}/;
// constructor for the middleware
module.exports = function(compiler, options) {
if(!options) options = {};
if(typeof options.watchOptions === "undefined") options.watchOptions = {};
if(typeof options.watchDelay !== "undefined") {
// TODO remove this in next major version
console.warn("options.watchDelay is deprecated: Use 'options.watchOptions.aggregateTimeout' instead");
options.watchOptions.aggregateTimeout = options.watchDelay;
}
if(typeof options.watchOptions.aggregateTimeout === "undefined") options.watchOptions.aggregateTimeout = 200;
if(typeof options.stats === "undefined") options.stats = {};
if(!options.stats.context) options.stats.context = process.cwd();
if(options.lazy) {
if(typeof options.filename === "string") {
var str = options.filename
.replace(/[\-\[\]\/\{\}\(\)\*\+\?\.\\\^\$\|]/g, "\\$&")
.replace(/\\\[[a-z]+\\\]/ig, ".+");
options.filename = new RegExp("^[\/]{0,1}" + str + "$");
}
}
// store our files in memory
var files = {};
var fs = new MemoryFileSystem();
// the base output path for web and webworker bundles
var outputPath;
if (typeof compiler.compilers === "undefined") {
compiler.outputFileSystem = fs;
outputPath = compiler.outputPath;
} else {
// when there is a mix of web and non-web compilers
// set the base outputPath and in-memory file stream
// only for the web and webwoker compilers
outputPath = compiler.compilers[0].outputPath;
compiler.compilers[0].outputFileSystem = fs;
for(var i = 1; i < compiler.compilers.length; i++) {
var currentCompiler = compiler.compilers[i];
if (typeof currentCompiler.options.target !== "undefined" &&
["web", "webwoker"].indexOf(currentCompiler.options.target) === -1) {
continue;
}
currentCompiler.outputFileSystem = fs;
while (currentCompiler.outputPath.indexOf(outputPath) !== 0 && /[\/\\]/.test(outputPath)) {
outputPath = outputPath.replace(/[\/\\][^\/\\]*$/, "");
}
}
}
compiler.plugin("done", function(stats) {
// We are now on valid state
state = true;
// Do the stuff in nextTick, because bundle may be invalidated
// if a change happend while compiling
process.nextTick(function() {
// check if still in valid state
if(!state) return;
// print webpack output
var displayStats = (!options.quiet && options.stats !== false);
if(displayStats &&
!(stats.hasErrors() || stats.hasWarnings()) &&
options.noInfo)
displayStats = false;
if(displayStats) {
console.log(stats.toString(options.stats));
}
if (!options.noInfo && !options.quiet)
console.info("webpack: bundle is now VALID.");
// execute callback that are delayed
var cbs = callbacks;
callbacks = [];
cbs.forEach(function continueBecauseBundleAvailible(cb) {
cb();
});
});
// In lazy mode, we may issue another rebuild
if(forceRebuild) {
forceRebuild = false;
rebuild();
}
});
// on compiling
function invalidPlugin() {
if(state && (!options.noInfo && !options.quiet))
console.info("webpack: bundle is now INVALID.");
// We are now in invalid state
state = false;
}
function invalidAsyncPlugin(compiler, callback) {
invalidPlugin();
callback();
}
compiler.plugin("invalid", invalidPlugin);
compiler.plugin("watch-run", invalidAsyncPlugin);
compiler.plugin("run", invalidAsyncPlugin);
// the state, false: bundle invalid, true: bundle valid
var state = false;
// in lazy mode, rebuild automatically
var forceRebuild = false;
// delayed callback
var callbacks = [];
// wait for bundle valid
function ready(fn, req) {
if(state) return fn();
if(!options.noInfo && !options.quiet)
console.log("webpack: wait until bundle finished: " + (req.url || fn.name));
callbacks.push(fn);
}
// start watching
if(!options.lazy) {
var watching = compiler.watch(options.watchOptions, function(err) {
if(err) throw err;
});
} else {
state = true;
}
function rebuild() {
if(state) {
state = false;
compiler.run(function(err) {
if(err) throw err;
});
} else {
forceRebuild = true;
}
}
function pathJoin(a, b) {
return a == "/" ? "/" + b : (a||"") + "/" + b
}
function getFilenameFromUrl(url) {
// publicPrefix is the folder our bundle should be in
var localPrefix = options.publicPath || "/";
if(url.indexOf(localPrefix) !== 0) {
if(/^(https?:)?\/\//.test(localPrefix)) {
localPrefix = "/" + localPrefix.replace(/^(https?:)?\/\/[^\/]+\//, "");
// fast exit if another directory requested
if(url.indexOf(localPrefix) !== 0) return false;
} else return false;
}
// get filename from request
var filename = url.substr(localPrefix.length);
if(filename.indexOf("?") >= 0) {
filename = filename.substr(0, filename.indexOf("?"));
}
return filename ? pathJoin(outputPath, filename) : outputPath;
}
// The middleware function
function webpackDevMiddleware(req, res, next) {
var filename = getFilenameFromUrl(req.url);
if (filename === false) return next();
// in lazy mode, rebuild on bundle request
if(options.lazy && (!options.filename || options.filename.test(filename)))
rebuild();
if(HASH_REGEXP.test(filename)) {
try {
if(fs.statSync(filename).isFile()) {
processRequest();
return;
}
} catch(e) {}
}
// delay the request until we have a vaild bundle
ready(processRequest, req);
function processRequest() {
try {
var stat = fs.statSync(filename);
if(!stat.isFile()) {
if (stat.isDirectory()) {
filename = pathJoin(filename, "index.html");
stat = fs.statSync(filename);
if(!stat.isFile()) throw "next";
} else {
throw "next";
}
}
} catch(e) {
return next();
}
// server content
var content = fs.readFileSync(filename);
res.setHeader("Access-Control-Allow-Origin", "*"); // To support XHR, etc.
res.setHeader("Content-Type", mime.lookup(filename));
res.setHeader("Content-Length", content.length);
if(options.headers) {
for(var name in options.headers) {
res.setHeader(name, options.headers[name]);
}
}
if (res.send) res.send(content);
else res.end(content);
}
}
webpackDevMiddleware.getFilenameFromUrl = getFilenameFromUrl;
webpackDevMiddleware.waitUntilValid = function(callback) {
callback = callback || function(){};
if (!watching || !watching.running) callback();
else ready(callback, {});
};
webpackDevMiddleware.invalidate = function(callback) {
callback = callback || function(){};
if(watching) {
ready(callback, {});
watching.invalidate();
} else {
callback();
}
};
webpackDevMiddleware.close = function(callback) {
callback = callback || function(){};
if(watching) watching.close(callback);
else callback();
};
webpackDevMiddleware.fileSystem = fs;
return webpackDevMiddleware;
}