37 lines
1.2 KiB
JavaScript
37 lines
1.2 KiB
JavaScript
import { Duplex } from "node:stream";
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export class Port extends Duplex {
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bert;
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constructor(bert) {
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super({ objectMode: true });
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this.bert = bert;
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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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process.stderr.write(`Got term length: ${termLen}\n`);
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const termBytes = process.stdin.read(termLen);
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if (termBytes) {
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this.push(this.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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}
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}
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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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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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