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package redisc
import (
"context"
"encoding/json"
"github.com/redis/go-redis/v9"
"log"
"strconv"
)
var Client *redis.Client
func getIndex(ctx context.Context) (int, error) {
val, err := Client.Get(ctx, "index").Result()
var i int
if err != nil && err != redis.Nil {
log.Printf("Problem with redis: %s", err)
return -1, err
} else if err == redis.Nil {
i = 0
} else {
i, err = strconv.Atoi(val)
if err != nil {
log.Printf("Problem in stored data: %s", err)
return -1, err
}
}
return i, nil
}
func getIndexAndBump(ctx context.Context) (int, error) {
i, err := getIndex(ctx)
if err != nil {
return -1, err
}
err = Client.Set(ctx, "index", strconv.Itoa(i+1), 0).Err()
if err != nil {
log.Printf("Problem with redis while trying to store data: %s", err)
return -1, err
}
return i + 1, err
}
func StoreComment(comment string) (int, error) {
ctx := context.Background()
i, err := getIndexAndBump(ctx)
if err != nil {
return -1, err
}
err = Client.Set(ctx, "comment"+strconv.Itoa(i), comment, 0).Err()
if err != nil {
log.Printf("Problem with redis while trying to store data: %s", err)
return -1, err
}
return i, err
}
func GetLatestComments() (string, error) {
messages := make([]string, 0)
ctx := context.Background()
index, err := getIndex(ctx)
if err != nil {
return "", err
}
for i := 0; i < 10; i++ {
if index-i <= 0 {
break
}
val, err := Client.Get(ctx, "comment"+strconv.Itoa(index-i)).Result()
if err != nil && err != redis.Nil {
log.Printf("Problem with redis while trying to retrieve data: %s", err)
return "", err
} else if err == redis.Nil {
continue
}
messages = append(messages, val)
}
msg, err := json.Marshal(messages)
if err != nil {
log.Fatalf("Json issue")
}
return string(msg), err
}
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