🐛 Fix expiration time in cache middleware (gofiber#1881)

* 🐛 Fix: Expiration time in cache middleware

* Custom expiration time using ExpirationGenerator is also functional
now instead of default Expiration only

* 🚨 Improve Test_CustomExpiration

* - stabilization of the tests
- speed up the cache tests
- fix race conditions in client and client tests

Co-authored-by: wernerr <rene@gofiber.io>

client.go

@@ -3,6 +3,7 @@ package fiber
 import (
 	"bytes"
 	"crypto/tls"
+	"encoding/json"
 	"encoding/xml"
 	"fmt"
 	"io"
@@ -16,8 +17,6 @@ import (
 	"sync"
 	"time"
 
-	"encoding/json"
-
 	"github.com/gofiber/fiber/v2/utils"
 	"github.com/valyala/fasthttp"
 )
@@ -60,6 +59,7 @@ var defaultClient Client
 //
 // It is safe calling Client methods from concurrently running goroutines.
 type Client struct {
+	mutex sync.RWMutex
 	// UserAgent is used in User-Agent request header.
 	UserAgent string
 
@@ -133,10 +133,15 @@ func (c *Client) createAgent(method, url string) *Agent {
 	a.req.Header.SetMethod(method)
 	a.req.SetRequestURI(url)
 
+	c.mutex.RLock()
 	a.Name = c.UserAgent
 	a.NoDefaultUserAgentHeader = c.NoDefaultUserAgentHeader
 	a.jsonDecoder = c.JSONDecoder
 	a.jsonEncoder = c.JSONEncoder
+	if a.jsonDecoder == nil {
+		a.jsonDecoder = json.Unmarshal
+	}
+	c.mutex.RUnlock()
 
 	if err := a.Parse(); err != nil {
 		a.errs = append(a.errs, err)
@@ -810,10 +815,6 @@ func (a *Agent) String() (int, string, []error) {
 // Struct returns the status code, bytes body and errors of url.
 // And bytes body will be unmarshalled to given v.
 func (a *Agent) Struct(v interface{}) (code int, body []byte, errs []error) {
-	if a.jsonDecoder == nil {
-		a.jsonDecoder = json.Unmarshal
-	}
-
 	if code, body, errs = a.Bytes(); len(errs) > 0 {
 		return
 	}
@@ -886,6 +887,8 @@ func AcquireClient() *Client {
 func ReleaseClient(c *Client) {
 	c.UserAgent = ""
 	c.NoDefaultUserAgentHeader = false
+	c.JSONEncoder = nil
+	c.JSONDecoder = nil
 
 	clientPool.Put(c)
 }

middleware/cache/cache.go

@@ -168,23 +168,23 @@ func New(config ...Config) fiber.Handler {
 		}
 
 		// default cache expiration
-		expiration := uint64(cfg.Expiration.Seconds())
+		expiration := cfg.Expiration
 		// Calculate expiration by response header or other setting
 		if cfg.ExpirationGenerator != nil {
-			expiration = uint64(cfg.ExpirationGenerator(c, &cfg).Seconds())
+			expiration = cfg.ExpirationGenerator(c, &cfg)
 		}
-		e.exp = ts + expiration
+		e.exp = ts + uint64(expiration.Seconds())
 
 		// For external Storage we store raw body separated
 		if cfg.Storage != nil {
-			manager.setRaw(key+"_body", e.body, cfg.Expiration)
+			manager.setRaw(key+"_body", e.body, expiration)
 			// avoid body msgp encoding
 			e.body = nil
-			manager.set(key, e, cfg.Expiration)
+			manager.set(key, e, expiration)
 			manager.release(e)
 		} else {
 			// Store entry in memory
-			manager.set(key, e, cfg.Expiration)
+			manager.set(key, e, expiration)
 		}
 
 		c.Set(cfg.CacheHeader, cacheMiss)

middleware/cache/cache_test.go

@@ -19,6 +19,8 @@ import (
 )
 
 func Test_Cache_CacheControl(t *testing.T) {
+	t.Parallel()
+
 	app := fiber.New()
 
 	app.Use(New(Config{
@@ -77,6 +79,8 @@ func Test_Cache_Expired(t *testing.T) {
 }
 
 func Test_Cache(t *testing.T) {
+	t.Parallel()
+
 	app := fiber.New()
 	app.Use(New())
 
@@ -102,6 +106,8 @@ func Test_Cache(t *testing.T) {
 }
 
 func Test_Cache_WithSeveralRequests(t *testing.T) {
+	t.Parallel()
+
 	app := fiber.New()
 
 	app.Use(New(Config{
@@ -135,6 +141,8 @@ func Test_Cache_WithSeveralRequests(t *testing.T) {
 }
 
 func Test_Cache_Invalid_Expiration(t *testing.T) {
+	t.Parallel()
+
 	app := fiber.New()
 	cache := New(Config{Expiration: 0 * time.Second})
 	app.Use(cache)
@@ -161,6 +169,8 @@ func Test_Cache_Invalid_Expiration(t *testing.T) {
 }
 
 func Test_Cache_Invalid_Method(t *testing.T) {
+	t.Parallel()
+
 	app := fiber.New()
 
 	app.Use(New())
@@ -199,6 +209,8 @@ func Test_Cache_Invalid_Method(t *testing.T) {
 }
 
 func Test_Cache_NothingToCache(t *testing.T) {
+	t.Parallel()
+
 	app := fiber.New()
 
 	app.Use(New(Config{Expiration: -(time.Second * 1)}))
@@ -225,6 +237,8 @@ func Test_Cache_NothingToCache(t *testing.T) {
 }
 
 func Test_Cache_CustomNext(t *testing.T) {
+	t.Parallel()
+
 	app := fiber.New()
 
 	app.Use(New(Config{
@@ -263,6 +277,8 @@ func Test_Cache_CustomNext(t *testing.T) {
 }
 
 func Test_CustomKey(t *testing.T) {
+	t.Parallel()
+
 	app := fiber.New()
 	var called bool
 	app.Use(New(Config{KeyGenerator: func(c *fiber.Ctx) string {
@@ -281,6 +297,8 @@ func Test_CustomKey(t *testing.T) {
 }
 
 func Test_CustomExpiration(t *testing.T) {
+	t.Parallel()
+
 	app := fiber.New()
 	var called bool
 	var newCacheTime int
@@ -291,18 +309,45 @@ func Test_CustomExpiration(t *testing.T) {
 	}}))
 
 	app.Get("/", func(c *fiber.Ctx) error {
-		c.Response().Header.Add("Cache-Time", "6000")
-		return c.SendString("hi")
+		c.Response().Header.Add("Cache-Time", "1")
+		now := fmt.Sprintf("%d", time.Now().UnixNano())
+		return c.SendString(now)
 	})
 
-	req := httptest.NewRequest("GET", "/", nil)
-	_, err := app.Test(req)
+	resp, err := app.Test(httptest.NewRequest("GET", "/", nil))
 	utils.AssertEqual(t, nil, err)
 	utils.AssertEqual(t, true, called)
-	utils.AssertEqual(t, 6000, newCacheTime)
+	utils.AssertEqual(t, 1, newCacheTime)
+
+	// Sleep until the cache is expired
+	time.Sleep(1 * time.Second)
+
+	cachedResp, err := app.Test(httptest.NewRequest("GET", "/", nil))
+	utils.AssertEqual(t, nil, err)
+
+	body, err := ioutil.ReadAll(resp.Body)
+	utils.AssertEqual(t, nil, err)
+	cachedBody, err := ioutil.ReadAll(cachedResp.Body)
+	utils.AssertEqual(t, nil, err)
+
+	if bytes.Equal(body, cachedBody) {
+		t.Errorf("Cache should have expired: %s, %s", body, cachedBody)
+	}
+
+	// Next response should be cached
+	cachedRespNextRound, err := app.Test(httptest.NewRequest("GET", "/", nil))
+	utils.AssertEqual(t, nil, err)
+	cachedBodyNextRound, err := ioutil.ReadAll(cachedRespNextRound.Body)
+	utils.AssertEqual(t, nil, err)
+
+	if !bytes.Equal(cachedBodyNextRound, cachedBody) {
+		t.Errorf("Cache should not have expired: %s, %s", cachedBodyNextRound, cachedBody)
+	}
 }
 
 func Test_AdditionalE2EResponseHeaders(t *testing.T) {
+	t.Parallel()
+
 	app := fiber.New()
 	app.Use(New(Config{
 		StoreResponseHeaders: true,
@@ -325,6 +370,8 @@ func Test_AdditionalE2EResponseHeaders(t *testing.T) {
 }
 
 func Test_CacheHeader(t *testing.T) {
+	t.Parallel()
+
 	app := fiber.New()
 
 	app.Use(New(Config{
@@ -364,6 +411,8 @@ func Test_CacheHeader(t *testing.T) {
 }
 
 func Test_Cache_WithHead(t *testing.T) {
+	t.Parallel()
+
 	app := fiber.New()
 	app.Use(New())
 
@@ -389,6 +438,8 @@ func Test_Cache_WithHead(t *testing.T) {
 }
 
 func Test_Cache_WithHeadThenGet(t *testing.T) {
+	t.Parallel()
+
 	app := fiber.New()
 	app.Use(New())
 	app.Get("/", func(c *fiber.Ctx) error {
@@ -425,6 +476,8 @@ func Test_Cache_WithHeadThenGet(t *testing.T) {
 }
 
 func Test_CustomCacheHeader(t *testing.T) {
+	t.Parallel()
+
 	app := fiber.New()
 
 	app.Use(New(Config{