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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,178 @@ | ||
| package config | ||
|
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||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "crypto/md5" | ||
| "encoding/hex" | ||
| "encoding/json" | ||
| "errors" | ||
| "fmt" | ||
| "io" | ||
| "log" | ||
| "net/http" | ||
| "strings" | ||
| "time" | ||
|
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| "github.com/factly/x/renderx" | ||
| "github.com/go-redis/redis" | ||
| "github.com/spf13/viper" | ||
| ) | ||
|
|
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| // GlobalCache: global cache | ||
| var GlobalCache *Cache | ||
|
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| type Cache struct { | ||
| client redis.UniversalClient | ||
| ttl time.Duration | ||
| } | ||
|
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| var AppPrefix = "dega-public:" | ||
|
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| func SetupCache() { | ||
|
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| client := redis.NewClient(&redis.Options{ | ||
| Addr: viper.GetString("redis_url"), | ||
| Password: viper.GetString("redis_password"), | ||
| DB: viper.GetInt("redis_db"), | ||
| }) | ||
|
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| GlobalCache = &Cache{client: client, ttl: time.Duration(viper.GetInt("redis_cache_duration")) * time.Second} | ||
|
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| } | ||
|
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| func (c *Cache) Set(ctx context.Context, key string, value interface{}) error { | ||
| bytes, err := json.Marshal(value) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| status := c.client.Set(AppPrefix+key, bytes, c.ttl) | ||
| return status.Err() | ||
| } | ||
|
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| func (c *Cache) Get(ctx context.Context, key string) ([]byte, error) { | ||
| s := c.client.Get(AppPrefix + key) | ||
| if s.Err() == redis.Nil { | ||
| return nil, errors.New("entry not found in cache") | ||
| } else { | ||
| return s.Bytes() | ||
| } | ||
| } | ||
|
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| func SaveToCache(ctx context.Context, queryStr string, data interface{}) error { | ||
| // hash query | ||
| h := md5.New() | ||
| _, _ = io.WriteString(h, queryStr) | ||
| hash := hex.EncodeToString(h.Sum(nil)) | ||
|
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| err := GlobalCache.Set(ctx, hash, data) | ||
| if err != nil { | ||
| return nil | ||
| } | ||
| return nil | ||
| } | ||
|
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| type CacheResponseWriter struct { | ||
| http.ResponseWriter | ||
| buf *bytes.Buffer | ||
| } | ||
|
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| // Here we are implementing a Write() function from ResponseWriter with our custom instructions. | ||
| func (myrw *CacheResponseWriter) Write(p []byte) (int, error) { | ||
| return myrw.buf.Write(p) | ||
| } | ||
|
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| func (myrw *CacheResponseWriter) WriteHeader(header int) { | ||
| myrw.ResponseWriter.WriteHeader(header) | ||
| } | ||
|
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| func RespMiddleware(next http.Handler) http.Handler { | ||
| return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | ||
| // Create a response writer: | ||
| crw := &CacheResponseWriter{ | ||
| ResponseWriter: w, | ||
| buf: &bytes.Buffer{}, | ||
| } | ||
|
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| body := requestBody{} | ||
| bodyBytes, _ := io.ReadAll(r.Body) | ||
| spaceId := r.Header.Get("x-space") | ||
| err := json.Unmarshal(bodyBytes, &body) | ||
| if err != nil { | ||
| w.WriteHeader(http.StatusInternalServerError) | ||
| return | ||
| } | ||
| r.Body.Close() | ||
| r.Body = io.NopCloser(bytes.NewBuffer(bodyBytes)) | ||
|
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| next.ServeHTTP(crw, r) | ||
|
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| queryString := body.Query | ||
| queryStr := strings.ReplaceAll(queryString, "\n", "") | ||
| queryStr = strings.ReplaceAll(queryStr, " ", "") | ||
|
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| varBytes, _ := json.Marshal(body.Variables) | ||
| varString := string(varBytes) | ||
|
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| var data interface{} | ||
| saveBytes := crw.buf.Bytes() | ||
|
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| _ = json.Unmarshal(saveBytes, &data) | ||
|
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| err = SaveToCache(r.Context(), fmt.Sprint(queryStr, varString, spaceId), data) | ||
| if err != nil { | ||
| log.Println(err.Error()) | ||
| } | ||
|
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| if _, err = io.Copy(w, crw.buf); err != nil { | ||
| log.Printf("Failed to send out response: %v", err) | ||
| } | ||
|
|
||
| }) | ||
| } | ||
|
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| type requestBody struct { | ||
| OperationName string `json:"operationName"` | ||
| Query string `json:"query"` | ||
| Variables interface{} `json:"variables"` | ||
| } | ||
|
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| func CachingMiddleware(next http.Handler) http.Handler { | ||
| return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { | ||
|
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| body := requestBody{} | ||
| spaceId := r.Header.Get("x-space") | ||
| bodyBytes, _ := io.ReadAll(r.Body) | ||
| err := json.Unmarshal(bodyBytes, &body) | ||
| if err != nil { | ||
| w.WriteHeader(http.StatusInternalServerError) | ||
| return | ||
| } | ||
|
|
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| // get query string from the request body | ||
| queryString := body.Query | ||
| queryStr := strings.ReplaceAll(queryString, "\n", "") | ||
| queryStr = strings.ReplaceAll(queryStr, " ", "") | ||
|
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| varBytes, _ := json.Marshal(body.Variables) | ||
| varString := string(varBytes) | ||
|
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| // hash query | ||
| h := md5.New() | ||
| io.WriteString(h, fmt.Sprint(queryStr, varString, spaceId)) | ||
| hash := hex.EncodeToString(h.Sum(nil)) | ||
|
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| respBodyBytes, err := GlobalCache.Get(r.Context(), hash) | ||
| if err == nil { | ||
| var data interface{} | ||
| _ = json.Unmarshal(respBodyBytes, &data) | ||
| renderx.JSON(w, http.StatusOK, data) | ||
| return | ||
| } | ||
|
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| r.Body.Close() | ||
| r.Body = io.NopCloser(bytes.NewBuffer(bodyBytes)) | ||
|
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| next.ServeHTTP(w, r) | ||
| }) | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
|
|
@@ -8,7 +8,7 @@ import ( | |
| func Router() chi.Router { | ||
| r := chi.NewRouter() | ||
|
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| r.Get("/", list) | ||
| r.Get("/", List) | ||
| return r | ||
|
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| } | ||
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