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Copy pathgtp_socket.ts
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226 lines (198 loc) · 7.1 KB
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// Copyright 2018 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Let's not worry about Socket.io type safety for now.
declare var io: any;
import {Nullable} from './base';
type TextHandler = (msg: string) => void;
type CmdHandler = (result: string, ok: boolean) => void;
type DataHandler = (obj: any) => void;
type ConnectCallback = () => void;
function trimText(str: string, len: number) {
if (str.length > len) {
return `${str.substr(0, len - 3)}...`;
}
return str;
}
// The GtpSocket serializes all calls to send so that only one call is ever
// outstanding at a time. This isn't strictly necessary, but it makes reading
// the debug logs easier because we don't end up with request and result logs
// all jumbled up.
class Socket {
private sock: any = null;
private cmdQueue: {cmd: string, resolve: any, reject: any}[] = [];
private token: string;
private handshakeComplete = false;
private connectCallback: Nullable<ConnectCallback> = null;
private lines: string[] = [];
private dataHandlers: {prefix: string, handler: DataHandler}[] = [];
private textHandlers: TextHandler[] = [];
private playerName = "";
private debug = false;
// Connects to the Minigui server at the given URI.
// Returns a promise that gets resolved of the board size when the connection
// is established.
connect(uri: string, playerName: string, debug=false) {
this.playerName = playerName;
this.debug = debug;
this.sock = io.connect(uri)
this.sock.on('json', (msg: string) => {
let obj = JSON.parse(msg);
if (obj.token != this.token) {
return;
}
if (obj.stdout !== undefined) {
if (obj.stdout != '') {
this.lines.push(obj.stdout.trim());
} else {
this.cmdHandler(this.lines.join('\n'));
this.lines = [];
}
} else if (obj.stderr !== undefined) {
this.stderrHandler(obj.stderr);
}
});
return new Promise((resolve) => {
// Connect to the server.
this.sock.on('connect', () => {
this.newSession();
resolve();
});
});
}
// Add a handler that will be invoked whenever the Minigo engine writes
// anything to stdout, or writes something to stderr that isn't handled by
// one of the data handlers registered via onData.
onText(handler: TextHandler) {
this.textHandlers.push(handler);
}
// Add a handler that accepts lines that begin with the given prefix plus ':'.
// The matching handlers are invoked in the order they were registered.
// Before the handlers are invoked, the contents of the line that follows the
// matching prefix are parsed as a JSON object if possible and passed as the
// handler argument. The raw line suffix is passed if it can't be parsed.
onData(prefix: string, handler: DataHandler) {
this.dataHandlers.push({prefix: prefix + ':', handler: handler});
}
// Sends a GTP command, returning a promise that is resolved when the
// command succeeds or is rejected if the command fails.
send(cmd: string): Promise<any> {
return new Promise((resolve, reject) => {
this.cmdQueue.push({cmd: cmd, resolve: resolve, reject: reject});
if (this.cmdQueue.length == 1) {
this.sendNext();
}
});
}
// Like send(cmd), but if the last call to sendOne is for the same GTP
// command (different arguments are allowed) and that command has not yet
// been sent, the pending command is rejected and replaced with this one.
sendOne(cmd: string) {
// Either the queue is empty (in which case we must just send) or there's
// a single command currently being executed (which we must let finish).
if (this.cmdQueue.length <= 1) {
return this.send(cmd);
}
// If the last command in the queue doesn't match this one: just send.
let lastCmd = this.cmdQueue[this.cmdQueue.length - 1].cmd;
if (cmd.split(' ', 1)[0] != lastCmd.split(' ', 1)[0]) {
return this.send(cmd);
}
// The last command in the queue matches this one: reject it and replace
// it with ours.
this.cmdQueue[this.cmdQueue.length - 1].reject('send one');
this.cmdQueue.length -= 1;
return this.send(cmd);
}
newSession() {
// Generates a new, unique session token and sends it to the server via
// a special echo __NEW_TOKEN__ command. The server forwards this on to its
// child Minigo process, which echos it back to the server after finishing
// processing any other outstanding work. The server's stdout/stderr
// handling logic in std_bg_thread looks for the __NEW_TOKEN__ string,
// extracts the session token and then attaches that token to all subsequent
// messages sent to the frontend.
this.cmdQueue = [];
let token = `${this.playerName}-${Date.now()}`;
this.token = token;
this.send(`echo __NEW_TOKEN__ ${token}`);
}
private cmdHandler(line: string) {
let {cmd, resolve, reject} = this.cmdQueue[0];
if (this.debug) {
console.log(`### ${this.playerName} OUT ${cmd} ${line}`);
}
this.textHandler(`${trimText(line, 1024)}`);
if (line[0] == '=' || line[0] == '?') {
// This line contains the response from a GTP command; pop the command off
// the queue.
this.cmdQueue = this.cmdQueue.slice(1);
if (this.cmdQueue.length > 0) {
this.sendNext();
}
}
let ok = line[0] == '=';
let result = line.substr(1).trim();
if (ok) {
resolve(result);
} else {
reject(result);
}
}
private stderrHandler(line: string) {
let handled = false;
if (this.debug) {
console.log(`### ${this.playerName} ERR ${line}`);
}
for (let {prefix, handler} of this.dataHandlers) {
if (line.substr(0, prefix.length) == prefix) {
let stripped = line.substr(prefix.length);
let obj;
try {
obj = JSON.parse(stripped);
} catch (e) {
obj = stripped;
}
try {
handler(obj);
} catch (e) {
// Catch and log all exceptions to prevent them breaking the socket.
console.log(`Error handling ${trimText(line, 1024)}`);
console.log(e);
}
handled = true;
}
}
if (!handled) {
this.textHandler(line);
}
}
private textHandler(str: string) {
for (let handler of this.textHandlers) {
handler(str);
}
}
private sendNext() {
let {cmd} = this.cmdQueue[0];
if (this.textHandler) {
this.textHandler(trimText(cmd, 1024));
}
if (this.debug) {
console.log(`### ${this.playerName} SND ${cmd}`);
}
this.sock.emit('gtpcmd', {player: this.playerName, data: cmd});
}
}
export {
Socket,
};