@talend/react-cmf/lib-esm/sagas/component.js

A framework built on top of best react libraries

import { spawn, cancel, take, takeEvery } from 'redux-saga/effects';
import CONST from '../constant';
import registry from '../registry';

/**
 * This function register a saga in the cmf registry
 * @param {string} id the saga id you want
 * @param {generator} saga the saga generator
 * @param {object} context optional context to get the registry
 */
export function register(id, saga, context) {
  registry.addToRegistry(`SAGA:${id}`, saga, context);
}

/**
 * This function allow to get a saga from the registry
 * @param {string} id the saga id you want
 * @param {object} context optional context to get the registry
 */
export function get(id, context) {
  return registry.getFromRegistry(`SAGA:${id}`, context);
}
export const registerMany = registry.getRegisterMany(register);
export const isActionCancelable = startAction => action => action.type === `${CONST.WILL_UNMOUNT_SAGA_STOP}_${startAction.saga}` && startAction.event.componentId === action.event.componentId;
export function* onSagaStart(action) {
  const isSagaInfoAnObject = typeof action.saga === 'object';
  const sagaId = isSagaInfoAnObject ? action.saga.id : action.saga;
  if (!sagaId) {
    throw new Error(`no saga id found in action: ${JSON.stringify(action)}`);
  }
  const sagaArgs = isSagaInfoAnObject ? action.saga.args : [];
  const saga = get(sagaId);
  if (!saga) {
    throw new Error(`saga not found: ${sagaId}`);
  }
  const task = yield spawn(saga, {
    ...action.props,
    // deprecated: you should only read { componentId }
    componentId: action.componentId
  }, ...sagaArgs);
  yield take(isActionCancelable(action));
  yield cancel(task);
}
export function* handle() {
  yield takeEvery(CONST.DID_MOUNT_SAGA_START, onSagaStart);
  yield take('DO_NOT_QUIT');
}
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