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redis.go
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redis.go
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/*
* 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.
*/
package confs
import (
"fmt"
"github.com/chanjarster/gears/simplelog"
"github.com/go-redis/redis/v7"
"strconv"
)
// Config keys:
// | Environment | Flag | Description |
// |---------------|-----------|--------------------------|
// | HOST | -host | |
// | PORT | -port | |
// | PASSWORD | -password | |
// | POOL | -pool | Connection pool size |
// | MIN_IDLE | -min-idle | Minimal idle connections |
// | DB | -db | Database to be selected after connecting to the server. |
// Note: if RedisConf is nested in another struct, add corresponding prefix.
type RedisConf struct {
Host string // Redis host
Port int // Redis port
Password string // Redis password
Pool int // Redis pool size
MinIdle int // Redis min idle
Db int // Database to be selected after connecting to the server. See https://redis.io/commands/select
}
type RedisOptionCustomizer func(ropt *redis.Options)
func NewRedisClient(rc *RedisConf, customizer RedisOptionCustomizer) *redis.Client {
redisOpts := prepareRedisNativeConfig(rc, customizer)
client := redis.NewClient(redisOpts)
_, err := client.Ping().Result()
if err != nil {
simplelog.ErrLogger.Fatal("Redis connection error: ", err)
}
simplelog.StdLogger.Printf("Connected to Redis: %s:%d\n", rc.Host, rc.Port)
return client
}
func (r *RedisConf) String() string {
return fmt.Sprintf("{Host: %s, Port: %d, Password: ***, Pool: %d, MinIdle: %d}",
r.Host, r.Port, r.Pool, r.MinIdle)
}
func prepareRedisNativeConfig(rc *RedisConf, customizer RedisOptionCustomizer) *redis.Options {
redisOpts := &redis.Options{
Addr: rc.Host + ":" + strconv.Itoa(rc.Port),
Password: rc.Password,
PoolSize: rc.Pool,
MinIdleConns: rc.MinIdle,
DB: rc.Db,
}
if customizer != nil {
customizer(redisOpts)
}
return redisOpts
}