@coorpacademy/squirrel/lib/etcd/watch.js

Local mirror mecanism for ETCD

"use strict";

exports.__esModule = true;
exports.default = void 0;

var _rxjs = require("rxjs");

var _debug = _interopRequireDefault(require("debug"));

var _fetch = _interopRequireDefault(require("./fetch"));

var _command = require("./command");

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

const debug = (0, _debug.default)('squirrel:etcd:watch');
const error = debug.extend('error');

const createWatcher$ = client => {
  return _rxjs.Observable.create(observer => {
    const watcher$ = client.watch().prefix('').create();
    observer.next(watcher$);
    observer.complete();
    return async () => {
      const watcher = await watcher$;
      watcher.cancel();
    };
  }).mergeMap(p => _rxjs.Observable.fromPromise(p)).mergeMap(watcher => {
    const connected$ = _rxjs.Observable.fromEvent(watcher, 'connected').do(() => debug(`Watcher is reconnected`));

    const disconnected$ = _rxjs.Observable.fromEvent(watcher, 'disconnected').do(err => {
      debug(`Watcher is disconnected`);
      error(err.message);
    }).ignoreElements();

    const connecting$ = _rxjs.Observable.fromEvent(watcher, 'connecting').do(() => debug(`Watcher is connecting`)).ignoreElements();

    const resync$ = _rxjs.Observable.merge(connected$, disconnected$, connecting$).concatMap(() => (0, _fetch.default)(client));

    const put$ = _rxjs.Observable.fromEvent(watcher, 'put').do(record => debug(`%o was updated to v%i`, record.key.toString('utf8'), record.mod_revision));

    const delete$ = _rxjs.Observable.fromEvent(watcher, 'delete').do(record => debug(`%o was removed`, record.key.toString('utf8')));

    const mutation$ = _rxjs.Observable.merge(put$, delete$).map(_command.createWatchCommand);

    return _rxjs.Observable.merge(resync$, mutation$);
  });
};

var _default = createWatcher$;
exports.default = _default;
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