Implement fs module (#3)

* Implements the fs module

* Add stats object

* Add not implemented to createWriteStream

* Update mkdtemp to use tmp dir

* Unexport Stats

* Add client web socket for commands and restructure

packages/protocol/src/node/command.ts

@@ -0,0 +1,105 @@
+import * as cp from "child_process";
+import * as nodePty from "node-pty";
+import * as stream from "stream";
+import { TextEncoder } from "text-encoding";
+import { NewSessionMessage, ServerMessage, SessionDoneMessage, SessionOutputMessage, ShutdownSessionMessage, IdentifySessionMessage, ClientMessage } from "../proto";
+import { SendableConnection } from "../common/connection";
+
+export interface Process {
+	stdin?: stream.Writable;
+	stdout?: stream.Readable;
+	stderr?: stream.Readable;
+
+	pid: number;
+	killed?: boolean;
+
+	on(event: "data", cb: (data: string) => void): void;
+	on(event: 'exit', listener: (exitCode: number, signal?: number) => void): void;
+	write(data: string | Uint8Array): void;
+	resize?(cols: number, rows: number): void;
+	kill(signal?: string): void;
+	title?: number;
+}
+
+export const handleNewSession = (connection: SendableConnection, newSession: NewSessionMessage, onExit: () => void): Process => {
+	let process: Process;
+
+	const env = {} as any;
+	newSession.getEnvMap().forEach((value: any, key: any) => {
+		env[key] = value;
+	});
+	if (newSession.getTtyDimensions()) {
+		// Spawn with node-pty
+		process = nodePty.spawn(newSession.getCommand(), newSession.getArgsList(), {
+			cols: newSession.getTtyDimensions()!.getWidth(),
+			rows: newSession.getTtyDimensions()!.getHeight(),
+			cwd: newSession.getCwd(),
+			env,
+		});
+	} else {
+		const options = {
+			cwd: newSession.getCwd(),
+			env,
+		};
+		let proc: cp.ChildProcess;
+		if (newSession.getIsFork()) {
+			proc = cp.fork(newSession.getCommand(), newSession.getArgsList());
+		} else {
+			proc = cp.spawn(newSession.getCommand(), newSession.getArgsList(), options);
+		}
+
+		process = {
+			stdin: proc.stdin,
+			stderr: proc.stderr,
+			stdout: proc.stdout,
+			on: (...args: any[]) => (<any>proc.on)(...args),
+			write: (d) => proc.stdin.write(d),
+			kill: (s) => proc.kill(s || "SIGTERM"),
+			pid: proc.pid,
+		};
+	}
+
+	const sendOutput = (fd: SessionOutputMessage.FD, msg: string | Uint8Array): void => {
+		const serverMsg = new ServerMessage();
+		const d = new SessionOutputMessage();
+		d.setId(newSession.getId());
+		d.setData(typeof msg === "string" ? new TextEncoder().encode(msg) : msg);
+		d.setFd(SessionOutputMessage.FD.STDOUT);
+		serverMsg.setSessionOutput(d);
+		connection.send(serverMsg.serializeBinary());
+	};
+
+	if (process.stdout && process.stderr) {
+		process.stdout.on("data", (data) => {
+			sendOutput(SessionOutputMessage.FD.STDOUT, data);
+		});
+
+		process.stderr.on("data", (data) => {
+			sendOutput(SessionOutputMessage.FD.STDERR, data);
+		});
+	} else {
+		process.on("data", (data) => {
+			sendOutput(SessionOutputMessage.FD.STDOUT, Buffer.from(data));
+		});
+	}
+
+	const id = new IdentifySessionMessage();
+	id.setId(newSession.getId());
+	id.setPid(process.pid);
+	const sm = new ServerMessage();
+	sm.setIdentifySession(id);
+	connection.send(sm.serializeBinary());
+
+	process.on("exit", (code, signal) => {
+		const serverMsg = new ServerMessage();
+		const exit = new SessionDoneMessage();
+		exit.setId(newSession.getId());
+		exit.setExitStatus(code);
+		serverMsg.setSessionDone(exit);
+		connection.send(serverMsg.serializeBinary());
+
+		onExit();
+	});
+
+	return process;
+};