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redis.go
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redis.go
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package redis
import (
"fmt"
"strings"
"time"
"github.com/fsnotify/fsnotify"
goredis "github.com/go-redis/redis/v7"
"github.com/spf13/viper"
"github.com/thejasn/go-redis-template/pkg/redis/config"
"github.com/thejasn/go-redis-template/pkg/redis/constant"
)
type yamlConfig struct {
NodeAddresses []string
Enabled bool
Host string
Port string
IdleConnectionTimeout time.Duration
ConnectTimeout time.Duration
ReadTimeout time.Duration
WriteTimeout time.Duration
MaxRetries int
MaxRedirects int
MinIdleConns int
PoolSize int
PoolTimeout time.Duration
}
// Config for connecting to a redis instance
type Config struct {
SingleConfig *goredis.Options
ClusterConfig *goredis.ClusterOptions
}
// Client represents either a redis cluster client or a standalone client
type Client struct {
Cluster *goredis.ClusterClient
Single *goredis.Client
}
// BuildConfig builds the redis configuration parameters from the application.yaml
func buildConfig() (Config, bool) {
redisConfig := viper.New()
config.LoadConfig(redisConfig)
redisConfig.WatchConfig()
redisConfig.OnConfigChange(func(e fsnotify.Event) {
fmt.Println("Config file changed:", e.Name)
config.LoadConfig(redisConfig)
})
yConfig := yamlConfig{
NodeAddresses: strings.Split(redisConfig.GetString(constant.ClusterAddress), ","),
Enabled: redisConfig.GetBool(constant.ClusterEnabled),
Host: redisConfig.GetString(constant.SingleHost),
Port: redisConfig.GetString(constant.SinglePort),
MaxRetries: redisConfig.GetInt(constant.MaxRetries),
MaxRedirects: redisConfig.GetInt(constant.MaxRedirects),
MinIdleConns: redisConfig.GetInt(constant.MinIdleConns),
ReadTimeout: time.Duration(redisConfig.GetInt(constant.ReadTimeout)) * time.Second,
WriteTimeout: time.Duration(redisConfig.GetInt(constant.WriteTimeout)) * time.Second,
IdleConnectionTimeout: time.Duration(redisConfig.GetInt(constant.IdleConnectionTimeout)) * time.Second,
ConnectTimeout: time.Duration(redisConfig.GetInt(constant.Timeout)) * time.Second,
PoolTimeout: time.Duration(redisConfig.GetInt(constant.PoolTimeout)) * time.Second,
PoolSize: redisConfig.GetInt(constant.PoolSize),
}
if yConfig.Enabled {
return Config{
ClusterConfig: &goredis.ClusterOptions{
Addrs: yConfig.NodeAddresses,
MaxRedirects: yConfig.MaxRedirects,
MaxRetries: yConfig.MaxRetries,
DialTimeout: yConfig.ConnectTimeout,
ReadTimeout: yConfig.ReadTimeout,
WriteTimeout: yConfig.WriteTimeout,
PoolSize: yConfig.PoolSize,
MinIdleConns: yConfig.MinIdleConns,
IdleTimeout: yConfig.IdleConnectionTimeout,
PoolTimeout: yConfig.PoolTimeout,
},
}, true
}
return Config{
SingleConfig: &goredis.Options{
Addr: strings.Join([]string{yConfig.Host, yConfig.Port}, ":"),
MaxRetries: yConfig.MaxRetries,
DialTimeout: yConfig.ConnectTimeout,
ReadTimeout: yConfig.ReadTimeout,
WriteTimeout: yConfig.WriteTimeout,
PoolSize: yConfig.PoolSize,
PoolTimeout: yConfig.PoolTimeout,
MinIdleConns: yConfig.MinIdleConns,
IdleTimeout: yConfig.IdleConnectionTimeout,
},
}, false
}
// NewClient generates a new redis client
func NewClient() Client {
redisConfig, isCluster := buildConfig()
if isCluster {
return Client{
Cluster: goredis.NewClusterClient(redisConfig.ClusterConfig),
}
}
return Client{
Single: goredis.NewClient(redisConfig.SingleConfig),
}
}