@backstage/cli/dist/lib/ipc/IpcServer.cjs.js

CLI for developing Backstage plugins and apps

'use strict';

var errors = require('@backstage/errors');

const requestType = "@backstage/cli/channel/request";
const responseType = "@backstage/cli/channel/response";
class IpcServer {
  #generation = 1;
  #methods = /* @__PURE__ */ new Map();
  addChild(child) {
    const generation = this.#generation++;
    const sendMessage = child.send?.bind(child);
    if (!sendMessage) {
      return;
    }
    const messageListener = (request) => {
      if (request.type !== requestType) {
        return;
      }
      const handler = this.#methods.get(request.method);
      if (!handler) {
        sendMessage({
          type: responseType,
          id: request.id,
          error: {
            name: "NotFoundError",
            message: `No handler registered for method ${request.method}`
          }
        });
        return;
      }
      Promise.resolve().then(() => handler(request.body, { generation })).then(
        (response) => sendMessage({
          type: responseType,
          id: request.id,
          body: response
        })
      ).catch(
        (error) => sendMessage({
          type: responseType,
          id: request.id,
          error: errors.serializeError(error)
        })
      );
    };
    child.addListener("message", messageListener);
    child.addListener("exit", () => {
      child.removeListener("message", messageListener);
    });
  }
  registerMethod(method, handler) {
    if (this.#methods.has(method)) {
      throw new Error(`A handler is already registered for method ${method}`);
    }
    this.#methods.set(method, handler);
  }
}

exports.IpcServer = IpcServer;
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