@nestjs/common/cache/interceptors/cache.interceptor.js

Nest - modern, fast, powerful node.js web framework (@common)

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
const tslib_1 = require("tslib");
const rxjs_1 = require("rxjs");
const operators_1 = require("rxjs/operators");
const decorators_1 = require("../../decorators");
const cache_constants_1 = require("../cache.constants");
const HTTP_ADAPTER_HOST = 'HttpAdapterHost';
const REFLECTOR = 'Reflector';
let CacheInterceptor = class CacheInterceptor {
    constructor(cacheManager, reflector) {
        this.cacheManager = cacheManager;
        this.reflector = reflector;
    }
    async intercept(context, next) {
        const key = this.trackBy(context);
        const ttl = this.reflector.get(cache_constants_1.CACHE_TTL_METADATA, context.getHandler()) || null;
        if (!key) {
            return next.handle();
        }
        try {
            const value = await this.cacheManager.get(key);
            if (value) {
                return rxjs_1.of(value);
            }
            return next.handle().pipe(operators_1.tap(response => {
                const args = ttl ? [key, response, { ttl }] : [key, response];
                this.cacheManager.set(...args);
            }));
        }
        catch (_a) {
            return next.handle();
        }
    }
    trackBy(context) {
        const httpAdapter = this.httpAdapterHost.httpAdapter;
        const isHttpApp = httpAdapter && !!httpAdapter.getRequestMethod;
        const cacheMetadata = this.reflector.get(cache_constants_1.CACHE_KEY_METADATA, context.getHandler());
        if (!isHttpApp || cacheMetadata) {
            return cacheMetadata;
        }
        const request = context.getArgByIndex(0);
        if (httpAdapter.getRequestMethod(request) !== 'GET') {
            return undefined;
        }
        return httpAdapter.getRequestUrl(request);
    }
};
tslib_1.__decorate([
    decorators_1.Optional(),
    decorators_1.Inject(HTTP_ADAPTER_HOST),
    tslib_1.__metadata("design:type", Object)
], CacheInterceptor.prototype, "httpAdapterHost", void 0);
CacheInterceptor = tslib_1.__decorate([
    decorators_1.Injectable(),
    tslib_1.__param(0, decorators_1.Inject(cache_constants_1.CACHE_MANAGER)),
    tslib_1.__param(1, decorators_1.Inject(REFLECTOR)),
    tslib_1.__metadata("design:paramtypes", [Object, Object])
], CacheInterceptor);
exports.CacheInterceptor = CacheInterceptor;