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375 |
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var events = require('events');
var torrents = module.exports = new events.EventEmitter();
var async = require('async');
var parse = require('parse-torrent');
var Archive = require('zip-stream');
var request = require('request');
var torrentStream = require('torrent-stream');
var File = require("./file");
var backend = require('./backend');
torrents.filesDownloading = 0;
var list = torrents.list = [];
//=============
// every second, check the status of all active torrents
setInterval(function() {
var changed = false;
var filesDownloading = 0;
for(var i = 0; i < list.length; i++) {
var t = list[i];
if(!t.$engine)
continue;
//check torrent speed
var swarm = t.$engine.swarm;
var status = {
down: swarm.downloaded,
downps: swarm.downloadSpeed(),
up: swarm.uploaded,
upps: swarm.uploadSpeed()
};
for(var k in status)
if(status[k] !== t.status[k])
changed = true;
if(t.zipping)
filesDownloading++;
//check file status
t.files.forEach(function(f) {
if(f.uploading)
filesDownloading++;
});
t.status = status;
}
if(torrents.filesDownloading !== filesDownloading) {
torrents.filesDownloading = filesDownloading;
changed = true;
}
if(changed)
torrents.emit("update");
}, 1000);
//=============
var fs = require("fs");
var rm = require("rimraf");
var path = require("path");
var TMP_DIR = path.resolve("./tmp");
var TS_DIR = path.join(TMP_DIR, "torrent-stream");
//on start, reopen existing torrents
setTimeout(function() {
if(!fs.existsSync(TS_DIR))
return;
var files = fs.readdirSync(TS_DIR);
if(!files)
return;
files.filter(function(f) {
return /\.torrent$/.test(f);
}).forEach( function(f) {
var buff = fs.readFileSync(path.join(TS_DIR, f));
load(parse(buff), function(err) {
if(!err)
console.log("Restored torrent", f);
});
});
});
//=============
//helpers
var findTorrent = function(hash) {
for(var i = 0; i < list.length; i++) {
var t = list[i];
if(t.hash === hash)
return t;
}
return null;
};
var findFile = function(torrent, path) {
for(var i = 0; i < torrent.files.length; i++) {
var f = torrent.files[i];
if(f.path === path)
return f;
}
return null;
};
//=============
var load = function(t, callback) {
if(!t)
return callback("Invalid torrent");
if(!t.infoHash)
return callback("Missing hash");
var torrent = findTorrent(t.infoHash);
if(torrent)
return callback("Torrent already exists");
torrent = {
$engine: null,
hash: t.infoHash,
name: t.name,
trackers: t.announce,
magnet: parse.toMagnetURI(t),
files: [],
status: {}
};
list.push(torrent);
torrents.emit("update");
//loaded, now open it
torrents.open({ hash:torrent.hash }, callback);
};
torrents.load = function(data, callback) {
if(data.magnet) {
load(parse(data.magnet), callback);
} else if(data.torrent) {
request({
method: "GET",
url: data.torrent,
gzip: true,
encoding: null //buffer!
}, function(err, resp, body) {
if(err)
return callback("Invalid URL");
var t;
try {
t = parse(body) ;
} catch(e) {
return callback("Failed to parse torrent");
}
load(t, callback);
});
} else {
return callback("Invalid request");
}
};
torrents.open = function(data, callback) {
var torrent = findTorrent(data.hash);
if(!torrent)
return callback("Torrent missing");
if(torrent.$engine)
return callback("Torrent already open");
//dont wait - open torrent stream, mark openning and callback
var engine = torrentStream(torrent.magnet, {
connections: 100,
uploads: 0, //TODO should upload, though we can be highly CPU/mem bound
tmp: TMP_DIR,
verify: true,
dht: true
});
torrent.$engine = engine;
torrent.openning = true;
torrents.emit("update");
callback(null);
engine.on('error', function(err) {
//TODO destroy torrent
console.error("torrent '%s' error: %s", torrent.name, err);
});
engine.on('ready', function() {
//overwrite magnet name with real name
torrent.name = engine.torrent.name;
torrent.files = engine.files.map(function(f, i) {
return new File(f, i, torrent);
});
torrent.openning = false;
torrent.open = true;
torrents.emit("update");
});
};
torrents.close = function(data, callback) {
var torrent = findTorrent(data.hash);
if(!torrent)
return callback("Torrent missing");
if(!torrent.$engine)
return callback("Torrent not open");
torrent.$engine.destroy(function() {
//ensure all files are stopped
if(torrent.files) {
torrent.files.forEach(function(f) {
f.cancel();
});
}
torrent.files = null;
torrent.open = false;
torrent.$engine = null;
torrents.emit("update");
callback(null);
});
};
torrents.remove = function(data, callback) {
var torrent = findTorrent(data.hash);
if(!torrent)
return callback("Torrent missing");
if(torrent.$engine)
return callback("Torrent is still open");
var i = list.indexOf(torrent);
list.splice(i, 1);
torrents.emit("update");
//clear torrent files and torrent
rm(path.join(TS_DIR, torrent.hash), function(err) {
if(err) console.log("failed to delete: %s", torrent.hash);
});
rm(path.join(TS_DIR, torrent.hash+".torrent"), function(err) {
if(err) console.log("failed to delete: %s.torrent", torrent.hash);
});
callback(null);
};
torrents.downloadFile = function(data, callback) {
var torrent = findTorrent(data.hash);
if(!torrent)
return callback("Missing torrent");
var file = findFile(torrent, data.path);
if(!file)
return callback("Missing file");
if(file.downloading)
return callback("Already downloading");
//callback to user early since uploads can take hours...
//user receives updates via websockets
callback(null);
file.uploading = true;
torrents.emit("update");
//pass copy of file to backend
backend.upload({
path: file.path,
length: file.length,
createReadStream: file.createReadStream.bind(file)
}, function(err) {
file.uploading = false;
//receive result from backend
if(err && err !== "cancelled") {
file.downloadError = "Backend Error";
torrents.emit("update");
return console.error("backend error: ", err);
}
torrents.emit("update");
//success, now re-list
backend.list(function(err, files) {
if(err) return console.error("failed to list");
torrents.emit("update", files);
});
});
};
torrents.cancelFile = function(data, callback) {
var torrent = findTorrent(data.hash);
if(!torrent)
return callback("Missing torrent");
var file = findFile(torrent, data.path);
if(!file)
return callback("Missing file");
if(!file.downloading)
return callback("Not downloading");
var success = file.cancel();
callback(success ? null : "Failed to close file");
};
torrents.zipAll = function(data, callback) {
var torrent = findTorrent(data.hash);
if(!torrent)
return callback("Missing torrent");
var files = torrent.files;
var archive = new Archive();
archive.on('error', function(err) {
console.error("zip error:", err);
});
async.series(files.map(function(f, i) {
return function(cb) {
archive.entry(f.createReadStream(), { name: f.path }, function(err) {
if(err)
return cb(err);
cb(null);
});
};
}), function(err) {
if(err) {
torrent.zipping = false;
torrents.emit("update");
return console.error("zip archive error:", err);
}
archive.finish();
});
torrent.zipping = true;
torrents.emit("update");
//callback to user early since uploads can take hours...
//user receives updates via websockets
callback(null);
//pass zip stream to backend
backend.upload({
path: torrent.name + ".zip",
length: files.reduce(function(len, f) { return len+f.length; }, 0),
createReadStream: function() { return archive; }
}, function(err) {
torrent.zipping = false;
torrents.emit("update");
if(err) {
return console.error("zip upload error:", err);
}
backend.list(function(err, files) {
if(err) return console.error("failed to list");
torrents.emit("update", files);
});
});
};
torrents.trash = function(data, callback) {
if(!data.path)
return callback("Missing path");
backend.remove(data.path, function(err) {
if(err) return callback("Failed to trash: " + err);
backend.list(function(err, files) {
if(err) return callback("Failed to list: " + err);
torrents.emit("update", files);
callback(null);
});
});
};
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