Created
September 4, 2020 00:28
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sample of redisearch
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const express = require("express"); | |
const fetch = require("node-fetch"); | |
const app = express(); | |
const redis = require("redis"); | |
const redisearch = require("redredisearch"); | |
const client = redis.createClient({ port: 6379, host: "127.0.0.1" }); | |
redisearch.setClient(client); | |
app.use(express.json()); | |
app.get("/pets", (req, res) => { | |
redisearch.createSearch("pets", {}, function (err, search) { | |
if (err) throw err; | |
let strs = []; | |
strs.push("Tobi wants four dollars"); | |
strs.push("Tobi only wants $4"); | |
strs.push("Loki is really fat"); | |
strs.forEach(function (str, i) { | |
search.index(str, i); | |
}); | |
search.query("Tobi").end(function (err, ids) { | |
if (err) throw err; | |
//console.log('Search results for "%s":', query); | |
console.log(ids); | |
ids.forEach(function (id) { | |
console.log("data - %s", strs[id]); | |
}); | |
}); | |
}); | |
return res.json({ message: "OK" }); | |
}); | |
app.get("/hashes", async (req, res) => { | |
const hashKey = "test:hashes"; | |
return client.hgetall(hashKey, (err, hash) => { | |
if (hash) { | |
console.log(hash); | |
return res.json({ type: "saved", data: hash }); | |
} else { | |
client.HMSET( | |
hashKey, | |
"hash:1", | |
"hash:value", | |
"hash:2", | |
"hash:cool", | |
(err, data) => { | |
return res.json({ type: "created", data }); | |
} | |
); | |
} | |
}); | |
}); | |
app.get("/photos", (req, res) => { | |
// key to store results in Redis store | |
const photosRedisKey = "user:photos"; | |
// Try fetching the result from Redis first in case we have it cached | |
return client.get(photosRedisKey, (err, photos) => { | |
// If that key exists in Redis store | |
if (photos) { | |
let data = JSON.parse(photos); | |
return res.json({ source: "cache", data, dataLength: data.length }); | |
} else { | |
// Key does not exist in Redis store | |
// Fetch directly from remote api | |
fetch("https://jsonplaceholder.typicode.com/photos") | |
.then((response) => response.json()) | |
.then((photos) => { | |
// Save the API response in Redis store, data expire time in 3600 seconds, it means one hour | |
client.setex(photosRedisKey, 1500, JSON.stringify(photos)); | |
// Send JSON response to client | |
return res.json({ source: "api", data: photos }); | |
}) | |
.catch((error) => { | |
// log error message | |
console.log(error); | |
// send error to the client | |
return res.json(error.toString()); | |
}); | |
} | |
}); | |
}); | |
app.get("/members", (req, res) => { | |
let setSize = 10; | |
const memberKey = "members"; | |
while (setSize > 0) { | |
client.SADD(memberKey, `member:${setSize}`); | |
setSize--; | |
} | |
client | |
.multi() | |
.scard("key") | |
.smembers("key") | |
.keys("*") | |
.dbsize() | |
.exec(function (err, replies) { | |
console.log("MULTI got " + replies.length + " replies"); | |
replies.forEach(function (reply, index) { | |
console.log("REPLY @ index " + index + ": " + reply.toString()); | |
}); | |
res.json({ multi: replies }); | |
}); | |
}); | |
app.listen(5000, () => console.log("app running on port 5000")); |
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{ | |
"name": "l-nredis", | |
"version": "1.0.0", | |
"main": "index.js", | |
"license": "MIT", | |
"scripts": { | |
"start": "node index.js" | |
}, | |
"dependencies": { | |
"express": "^4.17.1", | |
"node-fetch": "^2.6.0", | |
"redis": "^3.0.2", | |
"redredisearch": "^0.0.1" | |
} | |
} |
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