@hapiness/core/commonjs/core/hook.js

Project to have a HapiJS (https://hapijs.com/) based framework to create easier NodeJS back-end with some awesome features

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const rxjs_1 = require("rxjs");
const decorators_1 = require("./decorators");
const logger_1 = require("./logger");
class HookManager {
    /**
     * Check if a token has a hook implemented
     *
     * @param  {string} hook
     * @param  {Type} token
     * @returns boolean
     */
    static hasLifecycleHook(hook, token) {
        return token instanceof decorators_1.Type && hook in token.prototype;
    }
    /**
     * Trigger the hook if
     * it is implemented
     *
     * @param  {string}   hook
     * @param  {Type}     token
     * @param  {T}        instance
     * @param  {any[]}    args
     * @param  {boolean}  throwErr
     * @returns Observable
     */
    static triggerHook(hook, token, instance, args, throwErr) {
        return rxjs_1.Observable
            .merge(rxjs_1.Observable
            .of(this.hasLifecycleHook(hook, token))
            .filter(_ => !!_)
            .map(_ => Reflect.apply(instance[hook], instance, args || []))
            .flatMap(_ => (_ instanceof rxjs_1.Observable) ?
            _ : !!_ ?
            rxjs_1.Observable.of(_) :
            rxjs_1.Observable.empty()), rxjs_1.Observable
            .of(this.hasLifecycleHook(hook, token))
            .filter(_ => !_ && throwErr)
            .flatMap(_ => rxjs_1.Observable.throw(new Error(`Hook missing ${hook} on ${token.name}`))))
            .do(_ => this.logger.debug(`Triggering hook '${hook}' on '${token.name}'`));
    }
}
HookManager.logger = new logger_1.InternalLogger('hook');
exports.HookManager = HookManager;
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