Add redis. Prep for new save file

server/data/redis.go

@@ -0,0 +1,137 @@
+package data
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"time"
+
+	"github.com/redis/go-redis/v9"
+)
+
+type RedisCli struct {
+	Client *redis.Client
+}
+
+func NewRedisClient(address, password string) *RedisCli {
+
+	// option, err := redis.ParseURL("redis://" + username + ":" + password + "@localhost:6379/" + db)
+
+	options := redis.Options{
+		Addr:     address,
+		Password: password,
+		DB:       0,
+	}
+
+	client := redis.NewClient(&options)
+
+	if err := client.Ping(context.Background()); err != nil {
+		fmt.Println("trying localhost ...", err)
+		client = redis.NewClient(&redis.Options{
+			Addr:     "localhost:6379",
+			Password: password,
+			DB:       0,
+		})
+
+		if err_local := client.Ping(context.Background()); err_local != nil {
+			fmt.Println("> result ====> ", err_local)
+			// do as warning
+		} else {
+			fmt.Println("\n> Localhost Redis OK!\n")
+		}
+	} else {
+		fmt.Println("\n> Redis OK! \n")
+	}
+
+	return &RedisCli{
+		Client: client,
+	}
+}
+
+func (r *RedisCli) HealthCheck() error {
+	return r.Client.Ping(context.Background()).Err()
+}
+
+func (r *RedisCli) GetKeyTo(source string, dest interface{}) error {
+	fmt.Println("Redis> GET ", source)
+
+	// if cannot pass healthcheck, return err
+	if err := r.HealthCheck(); err != nil {
+		fmt.Println("HS> GET error ", err)
+		return err
+	}
+
+	saved, err := r.Client.Get(context.Background(), source).Result()
+
+	// chcek EOF
+	// fmt.Println("GET last char ", saved[len(saved)-1:])
+
+	if saved == "" || err != nil {
+		fmt.Println("GET error (empty on error)|", err, "|while saved=", saved)
+		return err
+	}
+
+	// fmt.Println("GET ", saved)
+
+	// if err != nil {
+	// 	fmt.Println("GET error ", err)
+	// 	return err
+	// }
+	err = json.NewDecoder(bytes.NewBufferString(saved)).Decode(dest)
+
+	if err != nil {
+		fmt.Println("GET error ", err)
+	}
+
+	return err
+}
+
+func (r *RedisCli) SetToKey(key string, value interface{}) error {
+	fmt.Println("Redis> SET ", key)
+
+	// if cannot pass healthcheck, return err
+	if err := r.HealthCheck(); err != nil {
+		fmt.Println("HS> SET error ", err)
+		return err
+	}
+
+	saved, err := json.Marshal(value)
+	if err != nil {
+		fmt.Println("SET error ", err)
+		return err
+	}
+
+	// late error
+	err = r.Client.Set(context.Background(), key, saved, redis.KeepTTL).Err()
+
+	if err != nil {
+		fmt.Println("error on SET ", err)
+	}
+
+	return err
+}
+
+func (r *RedisCli) ExpireKey(key string) error {
+
+	// if cannot pass healthcheck, return err
+	if err := r.HealthCheck(); err != nil {
+		fmt.Println("HS> EXPIRE error ", err)
+		return err
+	}
+
+	return r.Client.Expire(context.Background(), key, 0).Err()
+}
+
+func (r *RedisCli) SetKeyTimeout(key string, value interface{}, timeout int) error {
+
+	// if cannot pass healthcheck, return err
+	if err := r.HealthCheck(); err != nil {
+		fmt.Println("HS> EXPIRE error ", err)
+		return err
+	}
+
+	err := r.Client.Expire(context.Background(), key, time.Duration(timeout)*time.Second).Err()
+	fmt.Println("error on EXPIRE ", err)
+	return err
+}