80 lines
2.6 KiB
JavaScript
80 lines
2.6 KiB
JavaScript
import { Bert } from "./bert.js";
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import { Duplex } from "node:stream";
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const log = (msg) => process.stderr.write(`${msg}\r\n`);
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export class Port extends Duplex {
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bert;
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constructor(allBinariesAsString, mapKeyAsAtom, decodeUndefinedValues) {
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super({ objectMode: true });
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this.bert = new Bert(allBinariesAsString, mapKeyAsAtom, decodeUndefinedValues);
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process.stdin.on("readable", () => {
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while (this._read()) { }
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});
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}
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_read() {
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const lenBytes = process.stdin.read(4);
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if (lenBytes) {
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const termLen = this.bert.bytesToInt(lenBytes, 4, true);
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log(`Got incoming term length: ${termLen} (bytes: <<${lenBytes.toString('hex').match(/../g).map((hex) => parseInt(`0x${hex}`).toString()).join(', ')}>>).`);
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const termBytes = process.stdin.read(termLen);
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if (termBytes) {
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const decoded = this.bert.decode(termBytes);
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this.push(decoded);
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return decoded;
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}
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else {
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log("Term read got erroneous null.");
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return null;
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}
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}
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else
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return null;
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}
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_write(obj, encodingOrCallback, callback) {
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const actualCallback = callback || typeof encodingOrCallback === "function" ? encodingOrCallback : undefined;
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try {
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const term = this.bert.encode(obj, true);
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const len = Buffer.alloc(4);
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len.writeUInt32BE(term.length, 0);
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process.stdout.write(len);
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process.stdout.write(term, actualCallback);
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return true;
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}
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catch (error) {
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log(`Error writing: ${error}`);
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return false;
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}
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}
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}
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export class Server {
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port;
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handler;
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state = undefined;
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handleTerm = (term) => {
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if (this.state === undefined) {
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this.state = term;
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}
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else {
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this.handler(term, (t) => this.port.write(t), this.state, (reply, ...extraArgs) => {
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if (reply === "reply")
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this.port.write(term);
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if (reply === "reply" && extraArgs.length === 2) {
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this.state = extraArgs[1];
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}
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else if (reply === "noreply" && extraArgs.length === 1) {
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this.state = extraArgs[0];
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}
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});
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}
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};
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constructor(port, handler) {
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this.port = port;
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this.handler = handler;
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port.on("readable", () => {
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let term;
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while (term = port.read()) {
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this.handleTerm(term);
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}
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});
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}
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}
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