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import invariant from 'invariant';
import {
isEmpty, isFunction, isString, conformsTo
} from 'lodash';
import checkStore from './checkStore';
import { DAEMON, ONCE_TILL_UNMOUNT, RESTART_ON_REMOUNT } from './constants';
const allowedModes = [RESTART_ON_REMOUNT, DAEMON, ONCE_TILL_UNMOUNT];
const checkKey = key => invariant(
isString(key) && !isEmpty(key),
'(app/utils...) injectSaga: Expected `key` to be a non empty string',
);
const checkDescriptor = descriptor => {
const shape = {
saga: isFunction,
mode: mode => isString(mode) && allowedModes.includes(mode),
};
invariant(
conformsTo(descriptor, shape),
'(app/utils...) injectSaga: Expected a valid saga descriptor',
);
};
export function injectSagaFactory(store, isValid) {
return function injectSaga(key, descriptor = {}, args) {
if (!isValid) checkStore(store);
const newDescriptor = {
...descriptor,
mode: descriptor.mode || DAEMON,
};
const { saga, mode } = newDescriptor;
checkKey(key);
checkDescriptor(newDescriptor);
let hasSaga = Reflect.has(store.injectedSagas, key);
if (process.env.NODE_ENV !== 'production') {
const oldDescriptor = store.injectedSagas[key];
// enable hot reloading of daemon and once-till-unmount sagas
if (hasSaga && oldDescriptor.saga !== saga) {
oldDescriptor.task.cancel();
hasSaga = false;
}
}
if (
!hasSaga
|| (hasSaga && mode !== DAEMON && mode !== ONCE_TILL_UNMOUNT)
) {
/* eslint-disable no-param-reassign */
store.injectedSagas[key] = {
...newDescriptor,
task: store.runSaga(saga, args),
};
/* eslint-enable no-param-reassign */
}
};
}
export function ejectSagaFactory(store, isValid) {
return function ejectSaga(key) {
if (!isValid) checkStore(store);
checkKey(key);
if (Reflect.has(store.injectedSagas, key)) {
const descriptor = store.injectedSagas[key];
if (descriptor.mode && descriptor.mode !== DAEMON) {
descriptor.task.cancel();
// Clean up in production; in development we need `descriptor.saga` for hot reloading
if (process.env.NODE_ENV === 'production') {
// Need some value to be able to detect `ONCE_TILL_UNMOUNT` sagas in `injectSaga`
store.injectedSagas[key] = 'done'; // eslint-disable-line no-param-reassign
}
}
}
};
}
export default function getInjectors(store) {
checkStore(store);
return {
injectSaga: injectSagaFactory(store, true),
ejectSaga: ejectSagaFactory(store, true),
};
}
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