redis#RedisClientType TypeScript Examples

The following examples show how to use redis#RedisClientType. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.

Example #1

Source File: redis.ts From eosio-contract-api with GNU Affero General Public License v3.0

5 votes

readonly nodeRedis: RedisClientType<any, any>;

Example #2

Source File: redis.ts From eosio-contract-api with GNU Affero General Public License v3.0

5 votes

readonly nodeRedisSub: RedisClientType<any, any>;

Example #3

Source File: cache.ts From eosio-contract-api with GNU Affero General Public License v3.0

4 votes

export function expressRedisCache(
    redis: RedisClientType<any, any>, prefix: string, expire: number, whitelistedIPs?: string[]
): ExpressRedisCacheHandler {
    return (options: ExpressRedisCacheOptions = {}) => {
        return (req: express.Request, res: express.Response, next: express.NextFunction): void => {
            const factor = options.factor ? options.factor : 1;
            const cacheLife = options.expire ? (options.expire * factor) : (expire * factor);

            if (cacheLife === 0) {
                return next();
            }

            if (whitelistedIPs && whitelistedIPs.indexOf(req.ip) >= 0) {
                return next();
            }

            let key: string;
            if (options.urlHandler) {
                key = prefix + ':' + String(options.urlHandler(req, res, next));
            } else if (options.ignoreQueryString) {
                key = prefix + ':' + req.baseUrl + req.path;
            } else {
                const hash = crypto.createHash('sha256');

                if (req.body) {
                    hash.update(JSON.stringify(req.body));
                }

                if (req.query) {
                    hash.update(JSON.stringify(req.query));
                }

                key = prefix + ':' + req.baseUrl + req.path + ':' + hash.digest().toString('hex');
            }

            redis.get(key).then(reply => {
                let expire = 0;
                if (reply) {
                    const split = reply.split('::');

                    if (split[3]) {
                        expire = parseInt(split[3], 10) || 0;
                    }
                }

                if (expire < Date.now()) {
                    const sendFn = res.send.bind(res);

                    res.send = (data: Buffer | string): express.Response => {
                        const result = sendFn(data);

                        if (res.statusCode !== 200) {
                            return result;
                        }

                        let content;
                        if (typeof data === 'string') {
                            content = Buffer.from(data, 'utf8').toString('base64');
                        } else {
                            content = data.toString('base64');
                        }

                        expire = Date.now() + Math.round(cacheLife) * 1000;
                        redis.set(key, res.getHeader('content-type') + '::' + res.statusCode + '::' + content + '::' + expire).then(async () => {
                            await redis.expire(key, Math.round(cacheLife));

                            logger.debug('Cache request ' + key + ' for ' + cacheLife + ' seconds', mergeRequestData(req));
                        });

                        return result;
                    };

                    next();
                } else {
                    const split = reply.split('::');

                    if (split[0]) {
                        res.contentType(split[0]);
                    }

                    if (split[1]) {
                        res.status(parseInt(split[1], 10));
                    }

                    const buffer = Buffer.from(split[2], 'base64');

                    res.send(buffer);
                }
            });
        };
    };
}