56 lines
1.7 KiB
TypeScript
56 lines
1.7 KiB
TypeScript
import { Transport } from "./shared/transport.js";
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import { JSONRPCMessage } from "./types.js";
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/**
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* In-memory transport for creating clients and servers that talk to each other within the same process.
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*/
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export class InMemoryTransport implements Transport {
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private _otherTransport?: InMemoryTransport;
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private _messageQueue: JSONRPCMessage[] = [];
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onclose?: () => void;
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onerror?: (error: Error) => void;
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onmessage?: (message: JSONRPCMessage) => void;
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sessionId?: string;
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user?: unknown;
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/**
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* Creates a pair of linked in-memory transports that can communicate with each other. One should be passed to a Client and one to a Server.
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*/
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static createLinkedPair(): [InMemoryTransport, InMemoryTransport] {
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const clientTransport = new InMemoryTransport();
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const serverTransport = new InMemoryTransport();
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clientTransport._otherTransport = serverTransport;
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serverTransport._otherTransport = clientTransport;
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return [clientTransport, serverTransport];
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}
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async start(): Promise<void> {
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// Process any messages that were queued before start was called
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while (this._messageQueue.length > 0) {
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const message = this._messageQueue.shift();
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if (message) {
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this.onmessage?.(message);
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}
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}
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}
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async close(): Promise<void> {
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const other = this._otherTransport;
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this._otherTransport = undefined;
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await other?.close();
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this.onclose?.();
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}
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async send(message: JSONRPCMessage): Promise<void> {
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if (!this._otherTransport) {
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throw new Error("Not connected");
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}
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if (this._otherTransport.onmessage) {
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this._otherTransport.onmessage(message);
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} else {
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this._otherTransport._messageQueue.push(message);
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}
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}
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}
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