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feat: enhance caching mechanism with configurable durations and versi…
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,102 @@ | ||
| package middleware | ||
|
|
||
| import ( | ||
| "context" | ||
| "encoding/json" | ||
| "fmt" | ||
| "net/http" | ||
| "net/http/httptest" | ||
| "testing" | ||
| "time" | ||
|
|
||
| "github.com/alicebob/miniredis/v2" | ||
| "github.com/gin-gonic/gin" | ||
| "github.com/paycrest/protocol/config" | ||
| "github.com/prometheus/client_golang/prometheus" | ||
| "github.com/redis/go-redis/v9" | ||
| "github.com/stretchr/testify/assert" | ||
| ) | ||
|
|
||
| func setupTestRedis() (*miniredis.Miniredis, *redis.Client) { | ||
| mr, err := miniredis.Run() | ||
| if err != nil { | ||
| panic(err) | ||
| } | ||
|
|
||
| client := redis.NewClient(&redis.Options{ | ||
| Addr: mr.Addr(), | ||
| }) | ||
|
|
||
| return mr, client | ||
| } | ||
|
|
||
| func TestCacheMiddleware(t *testing.T) { | ||
| mr, client := setupTestRedis() | ||
| defer mr.Close() | ||
|
|
||
| cacheService := &CacheService{ | ||
| client: client, | ||
| metrics: CacheMetrics{ | ||
| hits: prometheus.NewCounter(prometheus.CounterOpts{Name: "cache_hits_total"}), | ||
| misses: prometheus.NewCounter(prometheus.CounterOpts{Name: "cache_misses_total"}), | ||
| }, | ||
| } | ||
|
|
||
| router := gin.Default() | ||
| router.GET("/v1/currencies", cacheService.CacheMiddleware(24*time.Hour), func(c *gin.Context) { | ||
| c.JSON(http.StatusOK, gin.H{"currencies": []string{"USD", "EUR", "GBP"}}) | ||
| }) | ||
|
|
||
| // First request should be a cache miss | ||
| w := httptest.NewRecorder() | ||
| req, _ := http.NewRequest("GET", "/v1/currencies", nil) | ||
| router.ServeHTTP(w, req) | ||
|
|
||
| assert.Equal(t, http.StatusOK, w.Code) | ||
| assert.Equal(t, "MISS", w.Header().Get("X-Cache")) | ||
|
|
||
| // Second request should be a cache hit | ||
| w = httptest.NewRecorder() | ||
| router.ServeHTTP(w, req) | ||
|
|
||
| assert.Equal(t, http.StatusOK, w.Code) | ||
| assert.Equal(t, "HIT", w.Header().Get("X-Cache")) | ||
| } | ||
|
|
||
| func TestWarmCache(t *testing.T) { | ||
| mr, client := setupTestRedis() | ||
| defer mr.Close() | ||
|
|
||
| cacheService := &CacheService{ | ||
| client: client, | ||
| metrics: CacheMetrics{ | ||
| hits: prometheus.NewCounter(prometheus.CounterOpts{Name: "cache_hits_total"}), | ||
| misses: prometheus.NewCounter(prometheus.CounterOpts{Name: "cache_misses_total"}), | ||
| }, | ||
| } | ||
|
|
||
| // Mock server to return currencies | ||
| mockServer := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | ||
| if r.URL.Path == "/v1/currencies" { | ||
| w.Header().Set("Content-Type", "application/json") | ||
| json.NewEncoder(w).Encode([]string{"USD", "EUR", "GBP"}) | ||
| } | ||
| })) | ||
| defer mockServer.Close() | ||
|
|
||
| // Override the base URL in the server configuration | ||
| conf := config.ServerConfig() | ||
| conf.HostDomain = mockServer.URL | ||
|
|
||
| ctx := context.Background() | ||
| err := cacheService.WarmCache(ctx) | ||
| assert.NoError(t, err) | ||
|
|
||
| // Verify that the currencies are cached | ||
| for _, currency := range []string{"USD", "EUR", "GBP"} { | ||
| key := fmt.Sprintf("%s:api:institutions:%s", conf.CacheVersion, currency) | ||
| val, err := client.Get(ctx, key).Result() | ||
| assert.NoError(t, err) | ||
| assert.NotEmpty(t, val) | ||
| } | ||
| } |