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var debugLevel = 0;
if ("NODE_DEBUG" in process.ENV) debugLevel = 1;
function debug (x) {
if (debugLevel > 0) {
process.stdio.writeError(x + "\n");
}
}
var socket = process.socket;
var bind = process.bind;
var listen = process.listen;
var accept = process.accept;
var close = process.close;
var shutdown = process.shutdown;
var read = process.read;
var write = process.write;
var toRead = process.toRead;
var Stream = function (peerInfo) {
process.EventEmitter.call();
var self = this;
self.fd = peerInfo.fd;
self.remoteAddress = peerInfo.remoteAddress;
self.remotePort = peerInfo.remotePort;
// Allocated on demand.
self.recvBuffer = null;
self.sendQueue = [];
self.readWatcher = new process.IOWatcher(function () {
debug("\n" + self.fd + " readable");
// If this is the first recv (recvBuffer doesn't exist) or we've used up
// most of the recvBuffer, allocate a new one.
if (!self.recvBuffer ||
self.recvBuffer.length - self.recvBuffer.used < 128) {
self._allocateNewRecvBuf();
}
debug("recvBuffer.used " + self.recvBuffer.used);
var bytesRead = read(self.fd,
self.recvBuffer,
self.recvBuffer.used,
self.recvBuffer.length - self.recvBuffer.used);
debug("bytesRead " + bytesRead + "\n");
if (bytesRead == 0) {
self.readable = false;
self.readWatcher.stop();
self.emit("eof");
} else {
var slice = self.recvBuffer.slice(self.recvBuffer.used,
self.recvBuffer.used + bytesRead);
self.recvBuffer.used += bytesRead;
self.emit("receive", slice);
}
});
self.readWatcher.set(self.fd, true, false);
self.readWatcher.start();
self.writeWatcher = new process.IOWatcher(function () {
self.flush();
});
self.writeWatcher.set(self.fd, false, true);
self.readable = true;
self.writable = true;
};
process.inherits(Stream, process.EventEmitter);
Stream.prototype._allocateNewRecvBuf = function () {
var self = this;
var newBufferSize = 1024; // TODO make this adjustable from user API
if (toRead) {
// Note: only Linux supports toRead().
// Is the extra system call even worth it?
var bytesToRead = toRead(self.fd);
if (bytesToRead > 1024) {
newBufferSize = 4*1024;
} else if (bytesToRead == 0) {
// Probably getting an EOF - so let's not allocate so much.
if (self.recvBuffer &&
self.recvBuffer.length - self.recvBuffer.used > 0) {
return; // just recv the eof on the old buf.
}
newBufferSize = 128;
}
}
self.recvBuffer = new process.Buffer(newBufferSize);
self.recvBuffer.used = 0;
};
Stream.prototype._allocateSendBuffer = function () {
var b = new process.Buffer(1024);
b.used = 0;
b.sent = 0;
this.sendQueue.push(b);
return b;
};
Stream.prototype.send = function (data, encoding) {
var self = this;
if (typeof(data) == "string") {
var buffer;
if (self.sendQueue.length == 0) {
buffer = self._allocateSendBuffer();
} else {
// walk through the sendQueue, find the first empty buffer
for (var i = 0; i < self.sendQueue.length; i++) {
if (self.sendQueue[i].used == 0) {
buffer = self.sendQueue[i];
break;
}
}
// if we didn't find one, take the last
if (!buffer) {
buffer = self.sendQueue[self.sendQueue.length-1];
// if last buffer is empty
if (buffer.length == buffer.used) buffer = self._allocateSendBuffer();
}
}
encoding = encoding || "ascii"; // default to ascii since it's faster
var charsWritten;
if (encoding.toLowerCase() == "utf8") {
charsWritten = buffer.utf8Write(data,
buffer.used,
buffer.length - buffer.used);
buffer.used += process.Buffer.utf8Length(data.slice(0, charsWritten));
} else {
// ascii
charsWritten = buffer.asciiWrite(data,
buffer.used,
buffer.length - buffer.used);
buffer.used += charsWritten;
debug("ascii charsWritten " + charsWritten);
debug("ascii buffer.used " + buffer.used);
}
// If we didn't finish, then recurse with the rest of the string.
if (charsWritten < data.length) {
debug("recursive send");
self.send(data.slice(charsWritten), encoding);
}
} else {
// data is a process.Buffer
// walk through the sendQueue, find the first empty buffer
var inserted = false;
data.sent = 0;
data.used = data.length;
for (var i = 0; i < self.sendQueue.length; i++) {
if (self.sendQueue[i].used == 0) {
// if found, insert the data there
self.sendQueue.splice(i, 0, data);
inserted = true;
break;
}
}
if (!inserted) self.sendQueue.push(data);
}
this.flush();
};
// returns true if flushed without getting EAGAIN
// false if it got EAGAIN
Stream.prototype.flush = function () {
var self = this;
var bytesWritten;
while (self.sendQueue.length > 0) {
var b = self.sendQueue[0];
if (b.sent == b.used) {
// this can be improved - save the buffer for later?
self.sendQueue.shift()
continue;
}
bytesWritten = write(self.fd,
b,
b.sent,
b.used - b.sent);
if (bytesWritten === null) {
this.writeWatcher.start();
return false;
}
b.sent += bytesWritten;
debug("bytes sent: " + b.sent);
}
this.writeWatcher.stop();
return true;
};
Stream.prototype.close = function () {
this.readable = false;
this.writable = false;
this.writeWatcher.stop();
this.readWatcher.stop();
close(this.fd);
debug("close peer " + this.fd);
this.fd = null;
};
var Server = function (listener) {
var self = this;
if (listener) {
self.addListener("connection", listener);
}
self.watcher = new process.IOWatcher(function (readable, writeable) {
while (self.fd) {
var peerInfo = accept(self.fd);
debug("accept: " + JSON.stringify(peerInfo));
if (!peerInfo) return;
var peer = new Stream(peerInfo);
self.emit("connection", peer);
}
});
};
process.inherits(Server, process.EventEmitter);
Server.prototype.listen = function () {
var self = this;
if (self.fd) throw new Error("Already running");
var backlogIndex;
if (typeof(arguments[0]) == "string" && arguments.length == 1) {
// the first argument specifies a path
self.fd = process.socket("UNIX");
// TODO unlink sockfile if exists?
// if (lstat(SOCKFILE, &tstat) == 0) {
// assert(S_ISSOCK(tstat.st_mode));
// unlink(SOCKFILE);
// }
bind(self.fd, arguments[0]);
backlogIndex = 1;
} else {
// the first argument is the port, the second an IP
self.fd = process.socket("TCP");
// TODO dns resolution on arguments[1]
bind(self.fd, arguments[0], arguments[1]);
backlogIndex = typeof(arguments[1]) == "string" ? 2 : 1;
}
listen(self.fd, arguments[backlogIndex] ? arguments[backlogIndex] : 128);
self.watcher.set(self.fd, true, false);
self.watcher.start();
};
Server.prototype.close = function () {
var self = this;
if (!self.fd) throw new Error("Not running");
self.watcher.stop();
close(self.fd);
self.fd = null;
};
///////////////////////////////////////////////////////
process.Buffer.prototype.toString = function () {
return this.utf8Slice(0, this.length);
};
var sys = require("sys");
var server = new Server(function (peer) {
sys.puts("connection (" + peer.fd + "): "
+ peer.remoteAddress
+ " port "
+ peer.remotePort
);
sys.puts("server fd: " + server.fd);
peer.addListener("receive", function (b) {
sys.puts("recv (" + b.length + "): " + b);
peer.send("pong\r\n");
});
});
//server.listen(8000);
server.listen(8000);
sys.puts("server fd: " + server.fd);