api/router: avoid unneeded loops and fix path match (#1594)

* api/router: avoid unneeded loops and fix path match

* if match found in google api path syntax, not try pcre loop
* if path is not ending via $ sign, append it to pcre to avoid matching other strings like
  /api/account/register can be matched to /api/account
* api: add tests and validations

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

server/grpc/grpc_test.go

@@ -33,6 +33,26 @@ func (s *testServer) HandleError(ctx context.Context, msg *pb.Request) error {
 	return fmt.Errorf("fake")
 }
 
+// TestHello implements helloworld.GreeterServer
+func (s *testServer) CallPcre(ctx context.Context, req *pb.Request, rsp *pb.Response) error {
+	if req.Name == "Error" {
+		return &errors.Error{Id: "1", Code: 99, Detail: "detail"}
+	}
+
+	rsp.Msg = "Hello " + req.Name
+	return nil
+}
+
+// TestHello implements helloworld.GreeterServer
+func (s *testServer) CallPcreInvalid(ctx context.Context, req *pb.Request, rsp *pb.Response) error {
+	if req.Name == "Error" {
+		return &errors.Error{Id: "1", Code: 99, Detail: "detail"}
+	}
+
+	rsp.Msg = "Hello " + req.Name
+	return nil
+}
+
 // TestHello implements helloworld.GreeterServer
 func (s *testServer) Call(ctx context.Context, req *pb.Request, rsp *pb.Response) error {
 	if req.Name == "Error" {