41 lines
1.3 KiB
JavaScript
41 lines
1.3 KiB
JavaScript
import { Bert } from "./bert.js";
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import { Duplex } from "node:stream";
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const bert = new Bert();
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const fakeWrite = () => undefined;
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process.stdout.write = fakeWrite;
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export class Port extends Duplex {
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constructor() {
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super({ objectMode: true });
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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 = bert.bytesToInt(lenBytes, 4, true);
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const termBytes = process.stdin.read(termLen);
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if (termBytes) {
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return bert.decode(termBytes);
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}
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else {
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process.stderr.write(`Read should have gotten ${termLen} bytes.\n`);
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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 = 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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return process.stdout.write(term, actualCallback);
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}
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catch (error) {
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process.stderr.write(`Error writing: ${error}\n`);
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return false;
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}
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}
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}
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