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struct_handler.go
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/
struct_handler.go
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// Copyright 2022 CloudWeGo Authors
//
// 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 handler
import (
"context"
"io"
"log"
"github.com/cloudwego/kitex-examples/grpcproxy/kitex_gen/grpcproxy"
"github.com/cloudwego/kitex-examples/grpcproxy/kitex_gen/grpcproxy/servicea"
"github.com/cloudwego/kitex-examples/grpcproxy/proxy"
"github.com/cloudwego/kitex/client"
"github.com/cloudwego/kitex/pkg/streaming"
"github.com/cloudwego/kitex/transport"
)
// GRPCStructProxyHandler redirects RPC struct from client to target server.
func GRPCStructProxyHandler(ctx context.Context, methodName string, serverStream streaming.Stream) error {
log.Println("Proxy Handler is working....")
_, address := proxy.Resolve(methodName)
client, _ := servicea.NewClient("destService", client.WithHostPorts(address),
client.WithTransportProtocol(transport.GRPC))
clientStream, err := client.Chat(context.Background())
if err != nil {
return err
}
s2c := redirectStruct(serverStream, clientStream)
c2s := redirectStruct(clientStream, serverStream)
for i := 0; i < 2; i++ {
select {
case s2cErr := <-s2c:
if s2cErr != io.EOF {
return s2cErr
}
case c2sErr := <-c2s:
if c2sErr != io.EOF {
return c2sErr
}
}
}
return nil
}
func redirectStruct(from, to streaming.Stream) chan error {
ret := make(chan error)
go func() {
for {
req := &grpcproxy.Request{}
err := from.RecvMsg(req)
if err != nil {
from.Close()
ret <- err
break
}
// do your own filter logic here
//if req.Name==xxx{
// continue
//}
err = to.SendMsg(req)
if err != nil {
ret <- err
break
}
}
}()
return ret
}