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writer_server.go
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writer_server.go
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// (c) 2019-2020, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package gresponsewriter
import (
"context"
"errors"
"net/http"
"google.golang.org/grpc"
"github.com/hashicorp/go-plugin"
"github.com/ava-labs/gecko/vms/rpcchainvm/ghttp/gconn"
"github.com/ava-labs/gecko/vms/rpcchainvm/ghttp/gconn/gconnproto"
"github.com/ava-labs/gecko/vms/rpcchainvm/ghttp/greader"
"github.com/ava-labs/gecko/vms/rpcchainvm/ghttp/greader/greaderproto"
"github.com/ava-labs/gecko/vms/rpcchainvm/ghttp/gresponsewriter/gresponsewriterproto"
"github.com/ava-labs/gecko/vms/rpcchainvm/ghttp/gwriter"
"github.com/ava-labs/gecko/vms/rpcchainvm/ghttp/gwriter/gwriterproto"
)
// Server is a http.Handler that is managed over RPC.
type Server struct {
writer http.ResponseWriter
broker *plugin.GRPCBroker
}
// NewServer returns a http.Handler instance manage remotely
func NewServer(writer http.ResponseWriter, broker *plugin.GRPCBroker) *Server {
return &Server{
writer: writer,
broker: broker,
}
}
// Write ...
func (s *Server) Write(ctx context.Context, req *gresponsewriterproto.WriteRequest) (*gresponsewriterproto.WriteResponse, error) {
headers := s.writer.Header()
for key := range headers {
delete(headers, key)
}
for _, header := range req.Headers {
headers[header.Key] = header.Values
}
n, err := s.writer.Write(req.Payload)
if err != nil {
return nil, err
}
return &gresponsewriterproto.WriteResponse{
Written: int32(n),
}, nil
}
// WriteHeader ...
func (s *Server) WriteHeader(ctx context.Context, req *gresponsewriterproto.WriteHeaderRequest) (*gresponsewriterproto.WriteHeaderResponse, error) {
headers := s.writer.Header()
for key := range headers {
delete(headers, key)
}
for _, header := range req.Headers {
headers[header.Key] = header.Values
}
s.writer.WriteHeader(int(req.StatusCode))
return &gresponsewriterproto.WriteHeaderResponse{}, nil
}
// Flush ...
func (s *Server) Flush(ctx context.Context, req *gresponsewriterproto.FlushRequest) (*gresponsewriterproto.FlushResponse, error) {
flusher, ok := s.writer.(http.Flusher)
if !ok {
return nil, errors.New("response writer doesn't support flushing")
}
flusher.Flush()
return &gresponsewriterproto.FlushResponse{}, nil
}
// Hijack ...
func (s *Server) Hijack(ctx context.Context, req *gresponsewriterproto.HijackRequest) (*gresponsewriterproto.HijackResponse, error) {
hijacker, ok := s.writer.(http.Hijacker)
if !ok {
return nil, errors.New("response writer doesn't support hijacking")
}
conn, readWriter, err := hijacker.Hijack()
if err != nil {
return nil, err
}
connID := s.broker.NextId()
readerID := s.broker.NextId()
writerID := s.broker.NextId()
go s.broker.AcceptAndServe(connID, func(opts []grpc.ServerOption) *grpc.Server {
connServer := grpc.NewServer(opts...)
gconnproto.RegisterConnServer(connServer, gconn.NewServer(conn))
return connServer
})
go s.broker.AcceptAndServe(readerID, func(opts []grpc.ServerOption) *grpc.Server {
readerServer := grpc.NewServer(opts...)
greaderproto.RegisterReaderServer(readerServer, greader.NewServer(readWriter))
return readerServer
})
go s.broker.AcceptAndServe(writerID, func(opts []grpc.ServerOption) *grpc.Server {
writerServer := grpc.NewServer(opts...)
gwriterproto.RegisterWriterServer(writerServer, gwriter.NewServer(readWriter))
return writerServer
})
local := conn.LocalAddr()
remote := conn.RemoteAddr()
return &gresponsewriterproto.HijackResponse{
ConnServer: connID,
LocalNetwork: local.Network(),
LocalString: local.String(),
RemoteNetwork: remote.Network(),
RemoteString: remote.String(),
ReaderServer: readerID,
WriterServer: writerID,
}, nil
}