/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 *
 */
async function main(args) {
    // execute a set and get command
    try   {
        // connnect to the redis database
        console.log("before creating redis client!")
        const db = require("redis").createClient({"url":args.redis_url})
        
        await db.connect()
        let p = args.redis_prefix

        console.log("redis client created successfully!")
        
        if(!p || p.length === 0) {
            await db.set("hello", "world")
            return db.get("hello").then(r => ({
                "hello": r
            }))
        } else {
            await db.set(p+"hello", "world")
            return db.get(p+"hello").then(r => ({
                "hello": r
            }))    
        }        
    }  
    catch (error) {
        console.log(error)
        return {            
            "message": "call to redis failed"
        }
    }

}