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handler.go
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handler.go
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// Copyright 2020 Douyu
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package xecho
import (
"bytes"
"net/http"
"reflect"
"strings"
"github.com/codegangsta/inject"
"github.com/douyu/jupiter/pkg/util/xerror"
"github.com/labstack/echo/v4"
"google.golang.org/grpc/metadata"
"google.golang.org/protobuf/encoding/protojson"
"google.golang.org/protobuf/proto"
)
// pbjson is a protojson.MarshalOptions with some default options.
var pbjson = protojson.MarshalOptions{
Multiline: false,
UseEnumNumbers: true,
EmitUnpopulated: true,
}
// ProtoError ...
func ProtoError(c echo.Context, code int, e error) error {
return ProtoJSON(c, code, xerror.Convert(e))
}
// ProtoJSON sends a Protobuf JSON response with status code and data.
func ProtoJSON(c echo.Context, code int, i interface{}) error {
var acceptEncoding = c.Request().Header.Get(HeaderAcceptEncoding)
var m proto.Message
switch msg := i.(type) {
case proto.Message:
m = msg
case error:
c.Response().Header().Set(HeaderHRPCErr, "true")
c.Response().Header().Set(HeaderContentType, MIMEApplicationJSONCharsetUTF8)
return c.JSON(http.StatusOK, xerror.Convert(i.(error)))
}
// protobuf output
if strings.Contains(acceptEncoding, MIMEApplicationProtobuf) {
c.Response().Header().Set(HeaderContentType, MIMEApplicationProtobuf)
c.Response().WriteHeader(code)
bs, _ := proto.Marshal(m)
_, err := c.Response().Write(bs)
return err
}
// json output
c.Response().Header().Set(HeaderContentType, MIMEApplicationJSONCharsetUTF8)
c.Response().WriteHeader(code)
body, err := pbjson.Marshal(m)
if err != nil {
return err
}
_, err = c.Response().Write(body)
return err
}
var grpcBinder = &ProtoBinder{}
// GRPCProxyWrapper ...
func GRPCProxyWrapper(h interface{}) echo.HandlerFunc {
t := reflect.TypeOf(h)
if t.Kind() != reflect.Func {
panic("reflect error: handler must be func")
}
return func(c echo.Context) error {
var req = reflect.New(t.In(1).Elem()).Interface()
if err := grpcBinder.Bind(req, c); err != nil {
return ProtoError(c, http.StatusBadRequest, errBadRequest)
}
var md = metadata.MD{}
for k, vs := range c.Request().Header {
for _, v := range vs {
bs := bytes.TrimFunc([]byte(v), func(r rune) bool {
return r == '\n' || r == '\r' || r == '\000'
})
md.Append(k, string(bs))
}
}
ctx := metadata.NewIncomingContext(c.Request().Context(), md)
var inj = inject.New()
inj.Map(ctx)
inj.Map(req)
vs, err := inj.Invoke(h)
if err != nil {
return ProtoError(c, http.StatusInternalServerError, errMicroInvoke)
}
if len(vs) != 2 {
return ProtoError(c, http.StatusInternalServerError, errMicroInvokeLen)
}
repV, errV := vs[0], vs[1]
if !errV.IsNil() || repV.IsNil() {
if e, ok := errV.Interface().(error); ok {
return ProtoError(c, http.StatusOK, e)
}
return ProtoError(c, http.StatusInternalServerError, errMicroInvokeInvalid)
}
if !repV.IsValid() {
return ProtoError(c, http.StatusInternalServerError, errMicroResInvalid)
}
return ProtoJSON(c, http.StatusOK, repV.Interface())
}
}