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85 lines
2.6 KiB
JavaScript
85 lines
2.6 KiB
JavaScript
"use strict";
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Object.defineProperty(exports, "__esModule", { value: true });
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exports.WsCursor = void 0;
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const errors_js_1 = require("../errors.js");
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const cursor_js_1 = require("../cursor.js");
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const queue_js_1 = require("../queue.js");
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const fetchChunkSize = 1000;
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const fetchQueueSize = 10;
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class WsCursor extends cursor_js_1.Cursor {
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#client;
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#stream;
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#cursorId;
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#entryQueue;
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#fetchQueue;
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#closed;
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#done;
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/** @private */
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constructor(client, stream, cursorId) {
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super();
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this.#client = client;
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this.#stream = stream;
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this.#cursorId = cursorId;
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this.#entryQueue = new queue_js_1.Queue();
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this.#fetchQueue = new queue_js_1.Queue();
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this.#closed = undefined;
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this.#done = false;
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}
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/** Fetch the next entry from the cursor. */
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async next() {
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for (;;) {
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if (this.#closed !== undefined) {
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throw new errors_js_1.ClosedError("Cursor is closed", this.#closed);
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}
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while (!this.#done && this.#fetchQueue.length < fetchQueueSize) {
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this.#fetchQueue.push(this.#fetch());
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}
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const entry = this.#entryQueue.shift();
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if (this.#done || entry !== undefined) {
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return entry;
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}
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// we assume that `Cursor.next()` is never called concurrently
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await this.#fetchQueue.shift().then((response) => {
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if (response === undefined) {
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return;
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}
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for (const entry of response.entries) {
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this.#entryQueue.push(entry);
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}
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this.#done ||= response.done;
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});
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}
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}
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#fetch() {
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return this.#stream._sendCursorRequest(this, {
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type: "fetch_cursor",
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cursorId: this.#cursorId,
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maxCount: fetchChunkSize,
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}).then((resp) => resp, (error) => {
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this._setClosed(error);
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return undefined;
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});
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}
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/** @private */
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_setClosed(error) {
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if (this.#closed !== undefined) {
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return;
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}
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this.#closed = error;
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this.#stream._sendCursorRequest(this, {
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type: "close_cursor",
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cursorId: this.#cursorId,
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}).catch(() => undefined);
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this.#stream._cursorClosed(this);
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}
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/** Close the cursor. */
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close() {
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this._setClosed(new errors_js_1.ClientError("Cursor was manually closed"));
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}
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/** True if the cursor is closed. */
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get closed() {
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return this.#closed !== undefined;
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}
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}
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exports.WsCursor = WsCursor;
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