mirror of
https://github.com/Jermolene/TiddlyWiki5
synced 2024-07-01 01:33:16 +00:00
76 lines
2.5 KiB
JavaScript
76 lines
2.5 KiB
JavaScript
/*
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FileRetriever can asynchronously retrieve files from HTTP URLs or the local file system. It incorporates
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throttling so that we don't get error EMFILE "Too many open files".
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*/
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var fs = require("fs"),
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path = require("path"),
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url = require("url"),
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util = require("util"),
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http = require("http"),
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https = require("https"),
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utils = require("./Utils.js");
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var FileRetriever = exports;
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var fileRequestQueue = utils.queue(function(task,callback) {
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fs.readFile(task.filepath,"utf8", function(err,data) {
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callback(err,data);
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console.error("Retrieved " + task.filepath);
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});
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},10);
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var httpRequestQueue = utils.queue(function(task,callback) {
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var opts = url.parse(task.url);
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var httpLib = opts.protocol === "http:" ? http : https;
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var request = httpLib.get(opts,function(res) {
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if(res.statusCode != 200) {
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var err = new Error("HTTP error");
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err.code = res.statusCode.toString();
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callback(err);
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} else {
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var data = [];
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res.on("data", function(chunk) {
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data.push(chunk)
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});
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res.on("end", function() {
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callback(null,data.join(""));
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console.error("Retrieved " + task.url);
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});
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}
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});
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request.addListener("error", function(err) {
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callback(err);
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});
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request.end();
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},4);
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// Retrieve a file given a filepath specifier and a context path. If the filepath isn't an absolute
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// filepath or an absolute URL, then it is interpreted relative to the context path, which can also be
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// a filepath or a URL. On completion, the callback function is called as callback(err,data). It
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// returns an object:
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// path: full path used to reach the file
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// basename: the basename of the file (used as the default tiddler title)
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// extname: the extension of the file
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FileRetriever.retrieveFile = function(filepath,contextPath,callback) {
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var httpRegExp = /^(https?:\/\/)/gi,
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result = {},
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filepathIsHttp = httpRegExp.test(filepath),
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contextPathIsHttp = httpRegExp.test(contextPath);
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if(contextPathIsHttp || filepathIsHttp) {
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// If we've got a full HTTP URI then we're good to go
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result.path = url.resolve(contextPath,filepath);
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var parsedPath = url.parse(result.path);
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result.extname = path.extname(parsedPath.pathname);
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result.basename = path.basename(parsedPath.extname);
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httpRequestQueue.push({url: result.path},callback);
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} else {
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// It's a file requested in a file context
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result.path = path.resolve(path.dirname(contextPath),filepath);
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result.extname = path.extname(result.path);
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result.basename = path.basename(result.path,result.extname);
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fileRequestQueue.push({filepath: result.path},callback);
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}
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return result;
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}
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