debug middleware for p4 (#18)

Author: tigh-latte

cmd/rest-server/main.go

@@ -22,7 +22,7 @@ import (
 	"github.com/libsv/go-p4/service"
 	p4Handlers "github.com/libsv/go-p4/transports/http"
 
-	paydMiddleware "github.com/libsv/go-p4/transports/http/middleware"
+	p4Middleware "github.com/libsv/go-p4/transports/http/middleware"
 )
 
 const appname = "payment-protocol-rest-server"
@@ -81,7 +81,8 @@ func main() {
 		AllowOrigins: []string{"*"},
 		AllowHeaders: []string{echo.HeaderOrigin, echo.HeaderContentType, echo.HeaderAccept},
 	}))
-	e.HTTPErrorHandler = paydMiddleware.ErrorHandler
+	e.Use(p4Middleware.DebugDumpBody(log.DEBUG))
+	e.HTTPErrorHandler = p4Middleware.ErrorHandler
 	if cfg.Server.SwaggerEnabled {
 		e.GET("/swagger/*", echoSwagger.WrapHandler)
 	}

transports/http/middleware/debug_logger.go

@@ -0,0 +1,24 @@
+package middleware
+
+import (
+	"strings"
+
+	"github.com/labstack/echo/v4"
+	"github.com/labstack/echo/v4/middleware"
+	"github.com/labstack/gommon/log"
+)
+
+// DebugDumpBody dumps the body of the request and response provided the
+// passed in log level is set.
+func DebugDumpBody(level log.Lvl) echo.MiddlewareFunc {
+	return middleware.BodyDumpWithConfig(middleware.BodyDumpConfig{
+		Skipper: func(c echo.Context) bool {
+			return log.Level() > level || !strings.HasPrefix(c.Path(), "/api/v1/")
+		},
+		Handler: func(e echo.Context, reqBody, respBody []byte) {
+			log.Debug(e.Request().URL.String())
+			log.Debug("request: ", string(reqBody))
+			log.Debug("response:", string(respBody))
+		},
+	})
+}