feat: verify RpcPath on startup (#2159)

* feat: verify RpcPath on startup

* feat: support http header Grpc-Timeout

gateway/internal/requestparser.go

@@ -0,0 +1,53 @@
+package internal
+
+import (
+	"bytes"
+	"encoding/json"
+	"net/http"
+
+	"github.com/fullstorydev/grpcurl"
+	"github.com/golang/protobuf/jsonpb"
+	"github.com/zeromicro/go-zero/rest/httpx"
+	"github.com/zeromicro/go-zero/rest/pathvar"
+)
+
+// NewRequestParser creates a new request parser from the given http.Request and resolver.
+func NewRequestParser(r *http.Request, resolver jsonpb.AnyResolver) (grpcurl.RequestParser, error) {
+	vars := pathvar.Vars(r)
+	params, err := httpx.GetFormValues(r)
+	if err != nil {
+		return nil, err
+	}
+
+	for k, v := range vars {
+		params[k] = v
+	}
+	if len(params) == 0 {
+		return grpcurl.NewJSONRequestParser(r.Body, resolver), nil
+	}
+
+	if r.ContentLength == 0 {
+		return buildJsonRequestParser(params, resolver)
+	}
+
+	m := make(map[string]interface{})
+	if err := json.NewDecoder(r.Body).Decode(&m); err != nil {
+		return nil, err
+	}
+
+	for k, v := range params {
+		m[k] = v
+	}
+
+	return buildJsonRequestParser(m, resolver)
+}
+
+func buildJsonRequestParser(m map[string]interface{}, resolver jsonpb.AnyResolver) (
+	grpcurl.RequestParser, error) {
+	var buf bytes.Buffer
+	if err := json.NewEncoder(&buf).Encode(m); err != nil {
+		return nil, err
+	}
+
+	return grpcurl.NewJSONRequestParser(&buf, resolver), nil
+}