Resources allocation improvement.

cache.go

@@ -4,9 +4,9 @@ import (
 	"fmt"
 	"time"
 
-	"github.com/akyoto/cache"
 	fiber "github.com/gofiber/fiber/v2"
 	"github.com/gookit/goutil/strutil"
+	libpack_cache "github.com/lukaszraczylo/graphql-monitoring-proxy/cache"
 )
 
 func calculateHash(c *fiber.Ctx) string {
@@ -14,19 +14,14 @@ func calculateHash(c *fiber.Ctx) string {
 }
 
 func enableCache() {
-	var err error
-	cfg.Cache.CacheClient = cache.New(time.Duration(cfg.Cache.CacheTTL) * time.Second * 2)
-	if err != nil {
-		cfg.Logger.Critical("Can't create cache client", map[string]interface{}{"error": err.Error()})
-		panic(err)
-	}
+	cfg.Cache.CacheClient = libpack_cache.New(time.Duration(cfg.Cache.CacheTTL) * time.Second * 2)
 }
 
 func cacheLookup(hash string) []byte {
 	if cfg.Cache.CacheClient != nil {
 		obj, found := cfg.Cache.CacheClient.Get(hash)
 		if found {
-			return obj.([]byte)
+			return obj
 		}
 	}
 	return nil

cache/cache.go

@@ -0,0 +1,92 @@
+package libpack_cache
+
+import (
+	"sync"
+	"time"
+)
+
+type CacheEntry struct {
+	Value     []byte
+	ExpiresAt time.Time
+}
+
+type Cache struct {
+	sync.RWMutex
+	entries   map[string]CacheEntry
+	globalTTL time.Duration
+}
+
+func New(globalTTL time.Duration) *Cache {
+	cache := &Cache{
+		entries:   make(map[string]CacheEntry),
+		globalTTL: globalTTL,
+	}
+
+	// Start the cache cleanup.
+	go cache.cleanupRoutine(globalTTL)
+	return cache
+}
+
+func (c *Cache) cleanupRoutine(globalTTL time.Duration) {
+	ticker := time.NewTicker(globalTTL / 2)
+	defer ticker.Stop()
+
+	for range ticker.C {
+		c.CleanExpiredEntries()
+	}
+}
+
+func (c *Cache) Set(key string, value []byte, ttl time.Duration) {
+	c.Lock()
+	defer c.Unlock()
+
+	now := time.Now()
+	expiresAt := now.Add(ttl)
+	if expiresAt.After(now.Add(c.globalTTL)) {
+		expiresAt = now.Add(c.globalTTL)
+	}
+
+	c.entries[key] = CacheEntry{
+		Value:     value,
+		ExpiresAt: expiresAt,
+	}
+}
+
+func (c *Cache) Get(key string) ([]byte, bool) {
+	c.RLock()
+	defer c.RUnlock()
+
+	entry, ok := c.entries[key]
+	if !ok || entry.ExpiresAt.Before(time.Now()) {
+		return nil, false
+	}
+
+	return entry.Value, true
+}
+
+func (c *Cache) Delete(key string) {
+	c.Lock()
+	defer c.Unlock()
+
+	delete(c.entries, key)
+}
+
+func (c *Cache) CleanExpiredEntries() {
+	now := time.Now()
+	toDelete := make([]string, 0)
+
+	c.RLock()
+	for key, entry := range c.entries {
+		if entry.ExpiresAt.Before(now) {
+			toDelete = append(toDelete, key)
+		}
+	}
+	c.RUnlock()
+
+	// Separate the deletion to its own critical section to reduce lock contention.
+	c.Lock()
+	for _, key := range toDelete {
+		delete(c.entries, key)
+	}
+	c.Unlock()
+}

go.mod

@@ -4,10 +4,9 @@ go 1.21
 
 require (
 	github.com/VictoriaMetrics/metrics v1.24.0
-	github.com/akyoto/cache v1.0.6
 	github.com/buger/jsonparser v1.1.1
 	github.com/gofiber/fiber/v2 v2.49.2
-	github.com/gookit/goutil v0.6.12
+	github.com/gookit/goutil v0.6.13
 	github.com/graphql-go/graphql v0.8.1
 	github.com/json-iterator/go v1.1.12
 	github.com/lukaszraczylo/ask v0.0.0-20230927103145-2ff1123b4415
@@ -19,6 +18,7 @@ require (
 )
 
 require (
+	github.com/akyoto/cache v1.0.6 // indirect
 	github.com/andybalholm/brotli v1.0.5 // indirect
 	github.com/avast/retry-go/v4 v4.5.0 // indirect
 	github.com/davecgh/go-spew v1.1.1 // indirect

go.sum

@@ -21,8 +21,8 @@ github.com/google/uuid v1.3.1 h1:KjJaJ9iWZ3jOFZIf1Lqf4laDRCasjl0BCmnEGxkdLb4=
 github.com/google/uuid v1.3.1/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/gookit/color v1.5.4 h1:FZmqs7XOyGgCAxmWyPslpiok1k05wmY3SJTytgvYFs0=
 github.com/gookit/color v1.5.4/go.mod h1:pZJOeOS8DM43rXbp4AZo1n9zCU2qjpcRko0b6/QJi9w=
-github.com/gookit/goutil v0.6.12 h1:73vPUcTtVGXbhSzBOFcnSB1aJl7Jq9np3RAE50yIDZc=
-github.com/gookit/goutil v0.6.12/go.mod h1:g6krlFib8xSe3G1h02IETowOtrUGpAmetT8IevDpvpM=
+github.com/gookit/goutil v0.6.13 h1:ttg7yMda6Q9fkE4P+YTwozd2wH1Le0CQldTAtOFBr7o=
+github.com/gookit/goutil v0.6.13/go.mod h1:YyDBddefmjS+mU2PDPgCcjVzTDM5WgExiDv5ZA/b8I8=
 github.com/graphql-go/graphql v0.8.1 h1:p7/Ou/WpmulocJeEx7wjQy611rtXGQaAcXGqanuMMgc=
 github.com/graphql-go/graphql v0.8.1/go.mod h1:nKiHzRM0qopJEwCITUuIsxk9PlVlwIiiI8pnJEhordQ=
 github.com/json-iterator/go v1.1.12 h1:PV8peI4a0ysnczrg+LtxykD8LfKY9ML6u2jnxaEnrnM=

struct_config.go

@@ -1,8 +1,8 @@
 package main
 
 import (
-	"github.com/akyoto/cache"
 	graphql "github.com/lukaszraczylo/go-simple-graphql"
+	libpack_cache "github.com/lukaszraczylo/graphql-monitoring-proxy/cache"
 	libpack_logging "github.com/lukaszraczylo/graphql-monitoring-proxy/logging"
 	libpack_monitoring "github.com/lukaszraczylo/graphql-monitoring-proxy/monitoring"
 	"github.com/valyala/fasthttp"
@@ -36,7 +36,7 @@ type config struct {
 	Cache struct {
 		CacheEnable bool
 		CacheTTL    int
-		CacheClient *cache.Cache
+		CacheClient *libpack_cache.Cache
 	}
 
 	Security struct {