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web-socket-handler.ts
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141 lines (126 loc) · 4.6 KB
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import WebSocket = require('isomorphic-ws');
import stream = require('stream');
import { V1Status } from './api';
import { KubeConfig } from './config';
const protocols = [
'v4.channel.k8s.io',
'v3.channel.k8s.io',
'v2.channel.k8s.io',
'channel.k8s.io',
];
export interface WebSocketInterface {
connect(
path: string,
textHandler: ((text: string) => boolean) | null,
binaryHandler: ((stream: number, buff: Buffer) => boolean) | null,
): Promise<WebSocket>;
}
export class WebSocketHandler implements WebSocketInterface {
public static readonly StdinStream = 0;
public static readonly StdoutStream = 1;
public static readonly StderrStream = 2;
public static readonly StatusStream = 3;
public static handleStandardStreams(
streamNum: number, buff: Buffer,
stdout: stream.Writable, stderr: stream.Writable,
): V1Status | null {
if (buff.length < 1) {
return null;
}
if (streamNum === WebSocketHandler.StdoutStream) {
stdout.write(buff);
} else if (streamNum === WebSocketHandler.StderrStream) {
stderr.write(buff);
} else if (streamNum === WebSocketHandler.StatusStream) {
// stream closing.
if (stdout) {
stdout.end();
}
if (stderr) {
stderr.end();
}
return JSON.parse(buff.toString('utf8')) as V1Status;
} else {
throw new Error('Unknown stream: ' + streamNum);
}
return null;
}
public static handleStandardInput(
ws: WebSocket,
stdin: stream.Readable | any,
streamNum: number = 0,
): boolean {
stdin.on('data', (data) => {
const buff = Buffer.alloc(data.length + 1);
buff.writeInt8(streamNum, 0);
if (data instanceof Buffer) {
data.copy(buff, 1);
} else {
buff.write(data, 1);
}
ws.send(buff);
});
stdin.on('end', () => {
ws.close();
});
// Keep the stream open
return true;
}
// factory is really just for test injection
public constructor(readonly config: KubeConfig,
readonly socketFactory?:
(uri: string, opts: WebSocket.ClientOptions) => WebSocket) {
}
/**
* Connect to a web socket endpoint.
* @param path The HTTP Path to connect to on the server.
* @param textHandler Callback for text over the web socket.
* Returns true if the connection should be kept alive, false to disconnect.
* @param binaryHandler Callback for binary data over the web socket.
* Returns true if the connection should be kept alive, false to disconnect.
*/
public connect(
path: string,
textHandler: ((text: string) => boolean) | null,
binaryHandler: ((stream: number, buff: Buffer) => boolean) | null,
): Promise<WebSocket> {
const cluster = this.config.getCurrentCluster();
if (!cluster) {
throw new Error('No cluster is defined.');
}
const server = cluster.server;
const ssl = server.startsWith('https://');
const target = ssl ? server.substr(8) : server.substr(7);
const proto = ssl ? 'wss' : 'ws';
const uri = `${proto}://${target}${path}`;
const opts: WebSocket.ClientOptions = {};
// TODO: This doesn't set insecureSSL if skipTLSVerify is set...
this.config.applytoHTTPSOptions(opts);
return new Promise((resolve, reject) => {
const client = (this.socketFactory ? this.socketFactory(uri, opts) : new WebSocket(uri, opts));
let resolved = false;
client.onopen = () => {
resolved = true;
resolve(client);
};
client.onerror = (err) => {
if (!resolved) {
reject(err);
}
};
client.onmessage = ({ data }: { data: WebSocket.Data }) => {
// TODO: support ArrayBuffer and Buffer[] data types?
if (typeof data === 'string') {
if (textHandler && !textHandler(data)) {
client.close();
}
} else if (data instanceof Buffer) {
const streamNum = data.readInt8(0);
if (binaryHandler && !binaryHandler(streamNum, data.slice(1))) {
client.close();
}
}
};
});
}
}