bb-inspired/dist/modules/cache/memory-cache.service.js

Core library for BB-inspired NestJS backend

"use strict";
var __decorate = (this && this.__decorate) || function (decorators, target, key, desc) {
    var c = arguments.length, r = c < 3 ? target : desc === null ? desc = Object.getOwnPropertyDescriptor(target, key) : desc, d;
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    return c > 3 && r && Object.defineProperty(target, key, r), r;
};
var __metadata = (this && this.__metadata) || function (k, v) {
    if (typeof Reflect === "object" && typeof Reflect.metadata === "function") return Reflect.metadata(k, v);
};
var __param = (this && this.__param) || function (paramIndex, decorator) {
    return function (target, key) { decorator(target, key, paramIndex); }
};
var MemoryCacheService_1;
Object.defineProperty(exports, "__esModule", { value: true });
exports.MemoryCacheService = void 0;
const common_1 = require("@nestjs/common");
const logger_1 = require("../../utils/logger");
let MemoryCacheService = MemoryCacheService_1 = class MemoryCacheService {
    constructor(options) {
        var _a, _b;
        this.options = options;
        this.logger = new logger_1.AppLogger(MemoryCacheService_1.name);
        this.cache = new Map();
        this.tagMap = new Map();
        this.defaultTtl = ((_a = options.memory) === null || _a === void 0 ? void 0 : _a.ttl) || 3600;
        this.maxItems = ((_b = options.memory) === null || _b === void 0 ? void 0 : _b.max) || 1000;
        this.logger.log(`Memory cache initialized with ${this.maxItems} max items`);
        setInterval(() => this.cleanup(), 60000);
    }
    async get(key) {
        const entry = this.cache.get(key);
        if (!entry) {
            return null;
        }
        if (entry.expiresAt && entry.expiresAt < Date.now()) {
            await this.delete(key);
            return null;
        }
        return entry.value;
    }
    async set(key, value, options = {}) {
        var _a;
        const ttl = (_a = options.ttl) !== null && _a !== void 0 ? _a : this.defaultTtl;
        const entry = {
            value,
            expiresAt: ttl > 0 ? Date.now() + ttl * 1000 : undefined,
            tags: options.tags,
        };
        if (this.cache.size >= this.maxItems && !this.cache.has(key)) {
            this.evictOldest();
        }
        this.cache.set(key, entry);
        if (options.tags && options.tags.length > 0) {
            for (const tag of options.tags) {
                if (!this.tagMap.has(tag)) {
                    this.tagMap.set(tag, new Set());
                }
                this.tagMap.get(tag).add(key);
            }
        }
    }
    async delete(key) {
        const entry = this.cache.get(key);
        if (!entry) {
            return false;
        }
        if (entry.tags && entry.tags.length > 0) {
            for (const tag of entry.tags) {
                const tagSet = this.tagMap.get(tag);
                if (tagSet) {
                    tagSet.delete(key);
                    if (tagSet.size === 0) {
                        this.tagMap.delete(tag);
                    }
                }
            }
        }
        return this.cache.delete(key);
    }
    async clear() {
        this.cache.clear();
        this.tagMap.clear();
        this.logger.log('Cleared all cache entries');
    }
    async has(key) {
        const entry = this.cache.get(key);
        if (!entry) {
            return false;
        }
        if (entry.expiresAt && entry.expiresAt < Date.now()) {
            await this.delete(key);
            return false;
        }
        return true;
    }
    async invalidateByTag(tag) {
        const tagSet = this.tagMap.get(tag);
        if (!tagSet || tagSet.size === 0) {
            return;
        }
        const keysToDelete = Array.from(tagSet);
        for (const key of keysToDelete) {
            await this.delete(key);
        }
        this.tagMap.delete(tag);
        this.logger.log(`Invalidated ${keysToDelete.length} cache entries with tag ${tag}`);
    }
    cleanup() {
        const now = Date.now();
        let expiredCount = 0;
        for (const [key, entry] of this.cache.entries()) {
            if (entry.expiresAt && entry.expiresAt < now) {
                this.delete(key);
                expiredCount++;
            }
        }
        if (expiredCount > 0) {
            this.logger.verbose(`Cleaned up ${expiredCount} expired cache entries`);
        }
    }
    evictOldest() {
        let oldestKey = null;
        let oldestTime = Infinity;
        for (const [key, entry] of this.cache.entries()) {
            if (entry.expiresAt && entry.expiresAt < oldestTime) {
                oldestTime = entry.expiresAt;
                oldestKey = key;
            }
        }
        if (!oldestKey) {
            oldestKey = this.cache.keys().next().value;
        }
        if (oldestKey) {
            this.delete(oldestKey);
            this.logger.verbose(`Evicted oldest cache entry: ${oldestKey}`);
        }
    }
};
exports.MemoryCacheService = MemoryCacheService;
exports.MemoryCacheService = MemoryCacheService = MemoryCacheService_1 = __decorate([
    (0, common_1.Injectable)(),
    __param(0, (0, common_1.Inject)('CACHE_OPTIONS')),
    __metadata("design:paramtypes", [Object])
], MemoryCacheService);
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