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writer_client.go
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/
writer_client.go
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// Copyright (C) 2019-2021, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package gresponsewriter
import (
"bufio"
"context"
"net"
"net/http"
"google.golang.org/protobuf/types/known/emptypb"
"github.com/hashicorp/go-plugin"
"github.com/haowang0402/avalanchego/api/proto/gconnproto"
"github.com/haowang0402/avalanchego/api/proto/greaderproto"
"github.com/haowang0402/avalanchego/api/proto/gresponsewriterproto"
"github.com/haowang0402/avalanchego/api/proto/gwriterproto"
"github.com/haowang0402/avalanchego/vms/rpcchainvm/ghttp/gconn"
"github.com/haowang0402/avalanchego/vms/rpcchainvm/ghttp/greader"
"github.com/haowang0402/avalanchego/vms/rpcchainvm/ghttp/gwriter"
)
var (
_ http.ResponseWriter = &Client{}
_ http.Flusher = &Client{}
_ http.Hijacker = &Client{}
)
// Client is an http.ResponseWriter that talks over RPC.
type Client struct {
client gresponsewriterproto.WriterClient
header http.Header
broker *plugin.GRPCBroker
}
// NewClient returns a response writer connected to a remote response writer
func NewClient(header http.Header, client gresponsewriterproto.WriterClient, broker *plugin.GRPCBroker) *Client {
return &Client{
client: client,
header: header,
broker: broker,
}
}
func (c *Client) Header() http.Header { return c.header }
func (c *Client) Write(payload []byte) (int, error) {
req := &gresponsewriterproto.WriteRequest{
Headers: make([]*gresponsewriterproto.Header, 0, len(c.header)),
Payload: payload,
}
for key, values := range c.header {
req.Headers = append(req.Headers, &gresponsewriterproto.Header{
Key: key,
Values: values,
})
}
resp, err := c.client.Write(context.Background(), req)
if err != nil {
return 0, err
}
return int(resp.Written), nil
}
func (c *Client) WriteHeader(statusCode int) {
req := &gresponsewriterproto.WriteHeaderRequest{
Headers: make([]*gresponsewriterproto.Header, 0, len(c.header)),
StatusCode: int32(statusCode),
}
for key, values := range c.header {
req.Headers = append(req.Headers, &gresponsewriterproto.Header{
Key: key,
Values: values,
})
}
// TODO: Is there a way to handle the error here?
_, _ = c.client.WriteHeader(context.Background(), req)
}
func (c *Client) Flush() {
// TODO: is there a way to handle the error here?
_, _ = c.client.Flush(context.Background(), &emptypb.Empty{})
}
type addr struct {
network string
str string
}
func (a *addr) Network() string { return a.network }
func (a *addr) String() string { return a.str }
func (c *Client) Hijack() (net.Conn, *bufio.ReadWriter, error) {
resp, err := c.client.Hijack(context.Background(), &emptypb.Empty{})
if err != nil {
return nil, nil, err
}
clientConn, err := c.broker.Dial(resp.ConnReadWriterServer)
if err != nil {
return nil, nil, err
}
conn := gconn.NewClient(
gconnproto.NewConnClient(clientConn),
&addr{
network: resp.LocalNetwork,
str: resp.LocalString,
},
&addr{
network: resp.RemoteNetwork,
str: resp.RemoteString,
},
clientConn,
)
reader := greader.NewClient(greaderproto.NewReaderClient(clientConn))
writer := gwriter.NewClient(gwriterproto.NewWriterClient(clientConn))
readWriter := bufio.NewReadWriter(
bufio.NewReader(reader),
bufio.NewWriter(writer),
)
return conn, readWriter, nil
}