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/* @flow
*
* Create a RethinkDB query and cache it's result in a TagCache
*
* Usage:
*
* const getThreadById = createReadQuery({
* // NOTE: No .run() at the end of the query!!!
* query: (threadId: string) => db.table('threads').get(threadId),
* tags: (threadId: string) => (thread: ?DBThread) => thread ? [thread.id, thread.communityId, thread.channelId] : [],
* });
*
* const updateUser = createWriteQuery({
* // NOTE: .run() at the end of the query
* query: (userId: string, data: Object) => db.table('users').get(userId).update(data).run(),
* invalidateTags: (userId: string) => () => [userId]
* });
*/
import { READ_RUN_ERROR, WRITE_RUN_ERROR } from './constants';
type RethinkDBQuery<O> = {
toString: Function,
run: () => Promise<O>,
};
type ProcessFn<I, O> = (data: O) => Promise<*> | *;
type TagsFn<I, O> = (data: O) => Array<?string>;
type CreateReadQueryInput<I, O> = $Exact<{
query: RethinkDBQuery<O>,
process?: ProcessFn<I, O>,
tags: TagsFn<I, O>,
}>;
type CreateQueryCallback<I, O> = (...args: I) => O;
export const createReadQuery = (callback: any) => {
return async (...args: any) => {
const input = callback(...args);
if (typeof input.query.run !== 'function') throw new Error(READ_RUN_ERROR);
// const queryString = input.query.toString();
// const cached = await queryCache.get(queryString);
// if (cached) {
// CACHED_RESULTS++;
// return cached;
// }
const result = await input.query
.run()
.then(input.process ? input.process : res => res);
// const tags = input.tags(result).filter(Boolean);
// await queryCache.set(queryString, result, tags);
return result;
};
};
type CreateWriteQueryInput<I, O> = $Exact<{
query: Promise<O>,
invalidateTags: TagsFn<I, O>,
}>;
export const createWriteQuery = <I: Array<*>, O: *>(callback: any) => {
return async (...args: I) => {
const input = callback(...args);
const result = await input.query;
if (typeof result.run === 'function') throw new Error(WRITE_RUN_ERROR);
// const tags = input.invalidateTags(result).filter(Boolean);
// await queryCache.invalidate(...tags);
return result;
};
};
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