こちらで定めた仕様を満たすサーバーサイドのプログラムです。
Redis の WebAPI を作成
サーバープログラム
フォルダー構成
$ tree
.
├── app.js
└── routes
└── index.js
app.js
//-------------------------------------------------------------------------
// app.js
//
// May/30/2023
//-------------------------------------------------------------------------
var express = require('express')
var routes = require('./routes')
var cfenv = require('cfenv')
var app = express()
app.use(express.json())
app.use(express.urlencoded({ extended: true }))
app.use(express.static(__dirname + '/public'))
const appEnv = cfenv.getAppEnv()
app.post('/read',routes.read)
app.post('/list',routes.list)
app.post('/insert',routes.insert)
app.listen(appEnv.port, '0.0.0.0', function() {
console.log("server starting on " + appEnv.url)
})
//-------------------------------------------------------------------------
routes/index.js
// -----------------------------------------------------------------------
/*
routes/index.js
May/29/2023
*/
// -----------------------------------------------------------------------
const redis = require("redis")
const client = redis.createClient()
exports.read = async function(req,res)
{
console.error ("*** read *** start ***")
await client.connect()
if (req.body.key) {
key = req.body.key
}
var dict_aa = {}
const value = await client.get(key)
dict_aa["key"] = value
const str_out = JSON.stringify(dict_aa)
res.send(str_out)
console.error ("*** read *** end ***")
await client.disconnect()
}
// -----------------------------------------------------------------------
exports.list = async function(req,res)
{
console.error ("*** list *** start ***")
await client.connect()
const keys = await client.keys('*')
const str_out = JSON.stringify(keys)
res.send(str_out)
console.error ("*** list *** end ***")
await client.disconnect()
}
// -----------------------------------------------------------------------
exports.insert = async function(req,res)
{
console.error ("*** insert *** start ***")
await client.connect()
var key = ""
var value = ""
if (req.body.key) {
key = req.body.key
}
if (req.body.value) {
value = req.body.value
}
await client.set(key, value, redis.print)
res.send(value)
await client.disconnect()
console.error ("*** insert *** end ***")
}
// -----------------------------------------------------------------------
サーバーの起動
$ export NODE_PATH=/usr/local/lib/node_modules
$ node app.js
server starting on http://localhost:3000
テストスクリプト
key の一覧
go_list.sh
#
URL=http://localhost:3000/list
#
curl -X POST $URL
#
echo
#
http POST $URL
#
echo
書き込み
go_insert.sh
#
URL=http://localhost:3000/insert
#
curl -X POST -d key="t1855" \
-d value="{"name": "宇都宮", "population": 27695, "date_mod": "2003-2-2"}" \
$URL
#
echo
#
http $URL key="t1856" \
value="{"name": "小山", "population": 65491, "date_mod": "2003-3-21"}"
#
#
読み出し
go_read.sh
#
URL=http://localhost:3000/read
#
curl -X POST -d key="t1855" $URL
#
echo
#
curl -X POST -H "Content-Type: application/json" \
-d '{"key":"t1856"}' $URL
#
echo
#
curl -X POST -H "Content-Type: application/json" \
-d@in01.json $URL
#
echo
#
http $URL key="t1858"
in01.json
{"key":"t1857"}
確認したバージョン
$ node --version
v20.2.0