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import { ConfigService } from "@nestjs/config";
import Redis from "ioredis";
import { createRedisConfig } from "./redis.config";
@Injectable()
export class RedisService implements OnModuleDestroy {
private readonly logger = new Logger(RedisService.name);
private readonly redis: Redis;
private readonly keyPrefix = "todo";
constructor(private readonly configService: ConfigService) {
const config = createRedisConfig(configService);
this.redis = new Redis(config);
this.redis.on("connect", () => {
this.logger.log("Redis connected");
});
this.redis.on("ready", () => {
this.logger.log("Redis ready");
});
this.redis.on("error", (error) => {
this.logger.error("Redis error", error.stack);
});
this.redis.on("close", () => {
this.logger.log("Redis connection closed");
});
}
onModuleDestroy() {
this.redis.disconnect();
}
// Health check
async ping(): Promise<boolean> {
try {
const result = await this.redis.ping();
return result === "PONG";
} catch (error) {
this.logger.error("Redis ping failed", error);
return false;
}
}
// Basic key-value operations
async get(key: string): Promise<string | null> {
return await this.redis.get(key);
}
async set(key: string, value: string, ttl?: number): Promise<string | null> {
if (ttl) {
return await this.redis.set(key, value, "EX", ttl);
}
return await this.redis.set(key, value);
}
async del(key: string): Promise<number> {
return await this.redis.del(key);
}
async exists(key: string): Promise<boolean> {
const result = await this.redis.exists(key);
return result === 1;
}
async expire(key: string, ttl: number): Promise<number> {
return await this.redis.expire(key, ttl);
}
async ttl(key: string): Promise<number> {
return await this.redis.ttl(key);
}
// Hash operations
async hget(key: string, field: string): Promise<string | null> {
return await this.redis.hget(key, field);
}
async hset(key: string, field: string, value: string): Promise<number> {
return await this.redis.hset(key, field, value);
}
async hdel(key: string, field: string): Promise<number> {
return await this.redis.hdel(key, field);
}
async hgetall(key: string): Promise<Record<string, string>> {
return await this.redis.hgetall(key);
}
async hmset(key: string, data: Record<string, string>): Promise<string> {
return await this.redis.hmset(key, data);
}
async hkeys(key: string): Promise<string[]> {
return await this.redis.hkeys(key);
}
async hvals(key: string): Promise<string[]> {
return await this.redis.hvals(key);
}
async hlen(key: string): Promise<number> {
return await this.redis.hlen(key);
}
async hexists(key: string, field: string): Promise<boolean> {
const result = await this.redis.hexists(key, field);
return result === 1;
}
// Sorted set operations
async zadd(key: string, score: number, member: string): Promise<number> {
return await this.redis.zadd(key, score, member);
}
async zrem(key: string, member: string): Promise<number> {
return await this.redis.zrem(key, member);
}
async zrange(key: string, start: number, stop: number): Promise<string[]> {
return await this.redis.zrange(key, start, stop);
}
async zrevrange(key: string, start: number, stop: number): Promise<string[]> {
return await this.redis.zrevrange(key, start, stop);
}
async zrangebyscore(
key: string,
min: number,
max: number,
): Promise<string[]> {
return await this.redis.zrangebyscore(key, min, max);
}
async zcard(key: string): Promise<number> {
return await this.redis.zcard(key);
}
async zscore(key: string, member: string): Promise<string | null> {
return await this.redis.zscore(key, member);
}
async zcount(key: string, min: number, max: number): Promise<number> {
return await this.redis.zcount(key, min, max);
}
// Set operations
async sadd(key: string, member: string): Promise<number> {
return await this.redis.sadd(key, member);
}
async srem(key: string, member: string): Promise<number> {
return await this.redis.srem(key, member);
}
async smembers(key: string): Promise<string[]> {
return await this.redis.smembers(key);
}
async sismember(key: string, member: string): Promise<boolean> {
const result = await this.redis.sismember(key, member);
return result === 1;
}
async scard(key: string): Promise<number> {
return await this.redis.scard(key);
}
// List operations
async lpush(key: string, value: string): Promise<number> {
return await this.redis.lpush(key, value);
}
async rpush(key: string, value: string): Promise<number> {
return await this.redis.rpush(key, value);
}
async lpop(key: string): Promise<string | null> {
return await this.redis.lpop(key);
}
async rpop(key: string): Promise<string | null> {
return await this.redis.rpop(key);
}
async lrange(key: string, start: number, stop: number): Promise<string[]> {
return await this.redis.lrange(key, start, stop);
}
async llen(key: string): Promise<number> {
return await this.redis.llen(key);
}
// Pattern matching
async keys(pattern: string): Promise<string[]> {
return await this.redis.keys(pattern);
}
async scan(
cursor: number = 0,
pattern?: string,
count?: number,
): Promise<[string, string[]]> {
if (pattern && count) {
return await this.redis.scan(cursor, "MATCH", pattern, "COUNT", count);
} else if (pattern) {
return await this.redis.scan(cursor, "MATCH", pattern);
} else if (count) {
return await this.redis.scan(cursor, "COUNT", count);
} else {
return await this.redis.scan(cursor);
}
}
// Transaction operations
pipeline() {
return this.redis.pipeline();
}
multi() {
return this.redis.multi();
}
// Utility methods
generateKey(type: string, ...parts: string[]): string {
return [this.keyPrefix, type, ...parts].join(":");
}
serializeData(data: unknown): string {
return JSON.stringify(data);
}
deserializeData<T>(data: string | null): T | null {
if (!data) return null;
try {
return JSON.parse(data) as T;
} catch (error) {
this.logger.error("Failed to deserialize data", error);
return null;
}
}
// Database operations
async flushdb(): Promise<string> {
return await this.redis.flushdb();
}
async flushall(): Promise<string> {
return await this.redis.flushall();
}
// Info operations
async info(section?: string): Promise<string> {
if (section) {
return await this.redis.info(section);
} else {
return await this.redis.info();
}
}
async dbsize(): Promise<number> {
return await this.redis.dbsize();
}
// Connection status
get status(): string {
return this.redis.status;
}
get isConnected(): boolean {
return this.redis.status === "ready";
}
// Advanced operations
async batch(
operations: Array<{ command: string; args: unknown[] }>,
): Promise<unknown[]> {
const pipeline = this.redis.pipeline();
for (const operation of operations) {
(pipeline as unknown as Record<string, (...args: unknown[]) => unknown>)[
operation.command
](...operation.args);
}
const results = await pipeline.exec();
return results?.map((result) => result[1]) || [];
}
async lock(key: string, value: string, ttl: number = 10): Promise<boolean> {
const result = await this.redis.set(key, value, "PX", ttl * 1000, "NX");
return result === "OK";
}
async unlock(key: string, value: string): Promise<boolean> {
const script = `
if redis.call("get", KEYS[1]) == ARGV[1] then
return redis.call("del", KEYS[1])
else
return 0
end
`;
const result = await this.redis.eval(script, 1, key, value);
return result === 1;
}
}
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