feat: add option to set the cache-control header

internal/serv/api.go

@@ -46,6 +46,7 @@ type Serv struct {
 	AllowedOrigins []string `mapstructure:"cors_allowed_origins"`
 	DebugCORS      bool     `mapstructure:"cors_debug"`
 	APIPath        string   `mapstructure:"api_path"`
+	CacheControl   string   `mapstructure:"cache_control"`
 
 	Auth  auth.Auth
 	Auths []auth.Auth

internal/serv/http.go

@@ -7,6 +7,7 @@ import (
 	"io/ioutil"
 	"net/http"
 
+	"github.com/dosco/super-graph/core"
 	"github.com/dosco/super-graph/internal/serv/internal/auth"
 	"github.com/rs/cors"
 	"go.uber.org/zap"
@@ -84,15 +85,19 @@ func apiV1(w http.ResponseWriter, r *http.Request) {
 		log.Printf("DBG query %s: %s", res.QueryName(), res.SQL())
 	}
 
-	if err != nil {
-		renderErr(w, err)
-	} else {
+	if err == nil {
+		if len(conf.CacheControl) != 0 && res.Operation() == core.OpQuery {
+			w.Header().Set("Cache-Control", conf.CacheControl)
+		}
 		json.NewEncoder(w).Encode(res)
+
+	} else {
+		renderErr(w, err)
 	}
 
 	if doLog && logLevel >= LogLevelInfo {
 		zlog.Info("success",
-			zap.String("op", res.Operation()),
+			zap.String("op", res.OperationName()),
 			zap.String("name", res.QueryName()),
 			zap.String("role", res.Role()),
 		)

internal/serv/tmpl/dev.yml

@@ -46,6 +46,13 @@ cors_allowed_origins: ["*"]
 # Debug Cross Origin Resource Sharing requests
 cors_debug: false
 
+# Default API path prefix is /api you can change it if you like
+# api_path: "/data"
+
+# Cache-Control header can help cache queries if your CDN supports cache-control 
+# on POST requests (does not work with not mutations) 
+# cache_control: "public, max-age=300, s-maxage=600"
+
 # Postgres related environment Variables
 # SG_DATABASE_HOST
 # SG_DATABASE_PORT

internal/serv/tmpl/prod.yml

@@ -49,6 +49,13 @@ reload_on_config_change: false
 # Debug Cross Origin Resource Sharing requests
 # cors_debug: false
 
+# Default API path prefix is /api you can change it if you like
+# api_path: "/data"
+
+# Cache-Control header can help cache queries if your CDN supports cache-control 
+# on POST requests (does not work with not mutations) 
+# cache_control: "public, max-age=300, s-maxage=600"
+
 # Postgres related environment Variables
 # SG_DATABASE_HOST
 # SG_DATABASE_PORT