Press n or j to go to the next uncovered block, b, p or k for the previous block.
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* @file src/redis.js.js
* @copyright 2019-present Karim Alibhai. All rights reserved.
*/
import * as net from 'net'
import createDebug from 'debug'
import RedisParser from 'redis-parser'
const commands = [
'ping',
// KEY-VALUE
'get',
'set',
// SET
'sadd',
'smembers',
'srem',
'scard',
// STREAM
'xack',
'xadd',
'xclaim',
'xdel',
'xgroup',
'xpending',
'xreadgroup',
// SORTED SET
'zadd',
'zrangebyscore',
'zrem',
]
const debug = createDebug('superq:redis')
function sendCommand(sock, cmdBuffer, cmd, args) {
return new Promise((resolve, reject) => {
let buffer = `*${1 + args.length}\r\n$${cmd.length}\r\n${cmd}\r\n`
for (const arg of args) {
const strArg = String(arg)
buffer += `$${strArg.length}\r\n${strArg}\r\n`
}
debug(`Sending command: %j`, buffer)
sock.write(buffer)
cmdBuffer.push({ resolve, reject })
})
}
export async function createRedis({
host = 'localhost',
port = 6379,
db = 0,
password,
} = {}) {
const cmdBuffer = []
const parser = new RedisParser({
returnReply: reply => {
const { resolve } = cmdBuffer.shift()
resolve(reply)
},
returnError: error => {
const { reject } = cmdBuffer.shift()
reject(error)
},
})
const sock = net.createConnection(port, host)
sock.on('data', chunk => {
Iif (debug.enabled) {
debug(`Received chunk from redis: %j`, chunk.toString('utf8'))
}
parser.execute(chunk)
})
await new Promise((resolve, reject) => {
sock.on('connect', () => {
resolve()
})
sock.on('error', error => {
reject(error)
})
})
Iif (password) {
await sendCommand(sock, cmdBuffer, 'AUTH', [password])
}
if (db !== 0) {
await sendCommand(sock, cmdBuffer, 'SELECT', [String(db)])
}
const redis = {
close() {
return new Promise(resolve => sock.end(resolve))
},
sendCommand(cmd, args = []) {
return sendCommand(sock, cmdBuffer, cmd, args)
},
multi() {
const transactionBuffer = []
const transaction = {
async exec() {
return new Promise((resolve, reject) => {
const cmdResults = []
let buffer = `*1\r\n$5\r\nMULTI\r\n`
cmdBuffer.push({
resolve() {},
reject,
})
for (const { command, args } of transactionBuffer) {
buffer += `*${args.length + 1}\r\n$${
command.length
}\r\n${command}\r\n`
args.forEach(arg => {
const strArg = String(arg)
buffer += `$${strArg.length}\r\n${strArg}\r\n`
})
cmdBuffer.push({
resolve() {
cmdResults.push(null)
},
reject(err) {
cmdResults.push(err)
},
})
}
cmdBuffer.push({
resolve(results) {
resolve(
cmdResults.map((result, index) => {
return [result, results[index]]
}),
)
},
reject,
})
sock.write(buffer + '*1\r\n$4\r\nEXEC\r\n')
})
},
}
commands.forEach(command => {
transaction[command] = function(...args) {
transactionBuffer.push({
command,
args,
})
return transaction
}
})
return transaction
},
}
commands.forEach(command => {
redis[command] = function(...args) {
return sendCommand(sock, cmdBuffer, command, args)
}
})
return redis
}
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