Spaces:
Sleeping
Sleeping
File size: 3,030 Bytes
4cadbaf |
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 |
import {EventEmitter} from "events";
import sha1 from "sha1";
import * as diff from "diff";
export default class RemoteFile extends EventEmitter {
autoReconnect: boolean;
socket: WebSocket;
connected: boolean = false;
filePath: string;
timestamp: number;
_content: string;
constructor ({autoReconnect = false} = {}) {
super();
this.autoReconnect = autoReconnect;
}
get hash (): string {
return sha1(this._content) as string;
}
get content (): string {
return this._content;
}
set content (value: string) {
const timestamp = Date.now();
const patch = diff.createPatch(this.filePath, this._content, value);
this.socket.send(JSON.stringify({
command: "increase",
timestamp,
fromHash: this.hash,
toHash: sha1(value),
patch,
}));
this.timestamp = timestamp;
this._content = value;
}
connect (host: string, filePath: string) {
if (this.socket)
this.socket.close();
this.socket = new WebSocket(host, "editor-frontend");
this.socket.onopen = () => {
console.debug("[RemoteFile] socket open.");
this.connected = true;
this.emit("connected");
this.socket.send(JSON.stringify({ command: "bindFile", filePath }));
};
this.socket.onclose = event => {
console.debug("Synchronizer service socket closed:", event.code, event.reason);
this.connected = false;
this.emit("disconnected");
if (this.autoReconnect && event.code === 1006) {
console.log("[RemoteFile] try to reconnect...");
setTimeout(() => this.connect(host, filePath), 100);
}
};
this.socket.onmessage = event => {
const message = JSON.parse(event.data);
switch (message.command) {
case "failure":
console.warn("service failure:", message.description);
this.close();
break;
case "fullSync":
this.timestamp = message.timestamp;
this._content = message.content;
console.assert(this.hash === message.hash, "[RemoteFile] verify failed:", this.hash, message.hash);
this.emit("sync", {timestamp: this.timestamp});
break;
case "increase":
//console.log("increase:", this.hash, message);
// already consistent with remote, update timestemp only
if (this.hash === message.toHash) {
this.timestamp = Math.max(this.timestamp, message.timestamp);
break;
}
if (this.hash !== message.fromHash) {
if (message.timestamp < this.timestamp)
break;
console.warn("hash mismatched:", this.hash, message.fromHash);
this.socket.send(JSON.stringify({ command: "requestFullSync", timestamp: this.timestamp}));
}
else {
this.timestamp = message.timestamp;
this._content = diff.applyPatch(this._content, message.patch);
console.assert(this.hash === message.toHash, "[RemoteFile] verify failed:", this.hash, message.toHash);
this.emit("sync", {timestamp: this.timestamp});
}
break;
default:
console.warn("[RemoteFile] unexpected command:", message);
}
};
this.filePath = filePath;
}
close () {
this.socket.close();
}
};
|