feat: verify RpcPath on startup (#2159)

* feat: verify RpcPath on startup

* feat: support http header Grpc-Timeout

gateway/internal/descriptorsource_test.go

@@ -0,0 +1,29 @@
+package internal
+
+import (
+	"encoding/base64"
+	"io/ioutil"
+	"os"
+	"testing"
+
+	"github.com/fullstorydev/grpcurl"
+	"github.com/stretchr/testify/assert"
+	"github.com/zeromicro/go-zero/core/hash"
+)
+
+const b64pb = `CpgBCgtoZWxsby5wcm90bxIFaGVsbG8iHQoHUmVxdWVzdBISCgRwaW5nGAEgASgJUgRwaW5nIh4KCFJlc3BvbnNlEhIKBHBvbmcYASABKAlSBHBvbmcyMAoFSGVsbG8SJwoEUGluZxIOLmhlbGxvLlJlcXVlc3QaDy5oZWxsby5SZXNwb25zZUIJWgcuL2hlbGxvYgZwcm90bzM=`
+
+func TestGetMethods(t *testing.T) {
+	tmpfile, err := ioutil.TempFile(os.TempDir(), hash.Md5Hex([]byte(b64pb)))
+	assert.Nil(t, err)
+	b, err := base64.StdEncoding.DecodeString(b64pb)
+	assert.Nil(t, err)
+	assert.Nil(t, ioutil.WriteFile(tmpfile.Name(), b, os.ModeTemporary))
+	defer os.Remove(tmpfile.Name())
+
+	source, err := grpcurl.DescriptorSourceFromProtoSets(tmpfile.Name())
+	assert.Nil(t, err)
+	methods, err := GetMethods(source)
+	assert.Nil(t, err)
+	assert.EqualValues(t, []string{"hello.Hello/Ping"}, methods)
+}