using readline instead of line-reader-fixes freeze

packages/api/src/utility/LineReader.js

@@ -0,0 +1,88 @@
+const readline = require('readline');
+
+class Queue {
+  constructor() {
+    this.elements = {};
+    this.head = 0;
+    this.tail = 0;
+  }
+  enqueue(element) {
+    this.elements[this.tail] = element;
+    this.tail++;
+  }
+  dequeue() {
+    const item = this.elements[this.head];
+    delete this.elements[this.head];
+    this.head++;
+    return item;
+  }
+  peek() {
+    return this.elements[this.head];
+  }
+  getLength() {
+    return this.tail - this.head;
+  }
+  isEmpty() {
+    return this.getLength() === 0;
+  }
+}
+
+class LineReader {
+  constructor(input) {
+    this.input = input;
+    this.queue = new Queue();
+    this.resolve = null;
+    this.isEnded = false;
+    this.rl = readline.createInterface({
+      input,
+    });
+    this.input.pause();
+
+    this.rl.on('line', line => {
+      this.input.pause();
+      if (this.resolve) {
+        const resolve = this.resolve;
+        this.resolve = null;
+        resolve(line);
+        return;
+      }
+      this.queue.enqueue(line);
+    });
+
+    this.rl.on('close', () => {
+      if (this.resolve) {
+        const resolve = this.resolve;
+        this.resolve = null;
+        this.isEnded = true;
+        resolve(null);
+        return;
+      }
+      this.queue.enqueue(null);
+    });
+  }
+
+  readLine() {
+    if (this.isEnded) {
+      return Promise.resolve(null);
+    }
+
+    if (!this.queue.isEmpty()) {
+      const res = this.queue.dequeue();
+      if (res == null) this.isEnded = true;
+      return Promise.resolve(res);
+    }
+
+    this.input.resume();
+
+    return new Promise(resolve => {
+      this.resolve = resolve;
+    });
+  }
+
+  close() {
+    this.isEnded = true;
+    return new Promise(resolve => this.input.close(resolve));
+  }
+}
+
+module.exports = LineReader;