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http_client.go
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http_client.go
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// (c) 2019-2020, Ava Labs, Inc. All rights reserved.
// See the file LICENSE for licensing terms.
package ghttp
import (
"net/http"
"google.golang.org/grpc"
"github.com/hashicorp/go-plugin"
"github.com/ava-labs/avalanchego/vms/rpcchainvm/ghttp/ghttpproto"
"github.com/ava-labs/avalanchego/vms/rpcchainvm/ghttp/greadcloser"
"github.com/ava-labs/avalanchego/vms/rpcchainvm/ghttp/greadcloser/greadcloserproto"
"github.com/ava-labs/avalanchego/vms/rpcchainvm/ghttp/gresponsewriter"
"github.com/ava-labs/avalanchego/vms/rpcchainvm/ghttp/gresponsewriter/gresponsewriterproto"
"github.com/ava-labs/avalanchego/vms/rpcchainvm/grpcutils"
)
var _ http.Handler = &Client{}
// Client is an http.Handler that talks over RPC.
type Client struct {
client ghttpproto.HTTPClient
broker *plugin.GRPCBroker
}
// NewClient returns an HTTP handler database instance connected to a remote
// HTTP handler instance
func NewClient(client ghttpproto.HTTPClient, broker *plugin.GRPCBroker) *Client {
return &Client{
client: client,
broker: broker,
}
}
func (c *Client) ServeHTTP(w http.ResponseWriter, r *http.Request) {
closer := grpcutils.ServerCloser{}
defer closer.GracefulStop()
readerID := c.broker.NextId()
go c.broker.AcceptAndServe(readerID, func(opts []grpc.ServerOption) *grpc.Server {
reader := grpc.NewServer(opts...)
closer.Add(reader)
greadcloserproto.RegisterReaderServer(reader, greadcloser.NewServer(r.Body))
return reader
})
writerID := c.broker.NextId()
go c.broker.AcceptAndServe(writerID, func(opts []grpc.ServerOption) *grpc.Server {
writer := grpc.NewServer(opts...)
closer.Add(writer)
gresponsewriterproto.RegisterWriterServer(writer, gresponsewriter.NewServer(w, c.broker))
return writer
})
req := &ghttpproto.HTTPRequest{
ResponseWriter: &ghttpproto.ResponseWriter{
Id: writerID,
Header: make([]*ghttpproto.Element, 0, len(r.Header)),
},
Request: &ghttpproto.Request{
Method: r.Method,
Proto: r.Proto,
ProtoMajor: int32(r.ProtoMajor),
ProtoMinor: int32(r.ProtoMinor),
Header: make([]*ghttpproto.Element, 0, len(r.Header)),
Body: readerID,
ContentLength: r.ContentLength,
TransferEncoding: r.TransferEncoding,
Host: r.Host,
Form: make([]*ghttpproto.Element, 0, len(r.Form)),
PostForm: make([]*ghttpproto.Element, 0, len(r.PostForm)),
RemoteAddr: r.RemoteAddr,
RequestURI: r.RequestURI,
},
}
for key, values := range w.Header() {
req.ResponseWriter.Header = append(req.ResponseWriter.Header, &ghttpproto.Element{
Key: key,
Values: values,
})
}
for key, values := range r.Header {
req.Request.Header = append(req.Request.Header, &ghttpproto.Element{
Key: key,
Values: values,
})
}
for key, values := range r.Form {
req.Request.Form = append(req.Request.Form, &ghttpproto.Element{
Key: key,
Values: values,
})
}
for key, values := range r.PostForm {
req.Request.PostForm = append(req.Request.PostForm, &ghttpproto.Element{
Key: key,
Values: values,
})
}
if r.URL != nil {
req.Request.Url = &ghttpproto.URL{
Scheme: r.URL.Scheme,
Opaque: r.URL.Opaque,
Host: r.URL.Host,
Path: r.URL.Path,
RawPath: r.URL.RawPath,
ForceQuery: r.URL.ForceQuery,
RawQuery: r.URL.RawQuery,
Fragment: r.URL.Fragment,
}
if r.URL.User != nil {
pwd, set := r.URL.User.Password()
req.Request.Url.User = &ghttpproto.Userinfo{
Username: r.URL.User.Username(),
Password: pwd,
PasswordSet: set,
}
}
}
if r.TLS != nil {
req.Request.Tls = &ghttpproto.ConnectionState{
Version: uint32(r.TLS.Version),
HandshakeComplete: r.TLS.HandshakeComplete,
DidResume: r.TLS.DidResume,
CipherSuite: uint32(r.TLS.CipherSuite),
NegotiatedProtocol: r.TLS.NegotiatedProtocol,
NegotiatedProtocolIsMutual: r.TLS.NegotiatedProtocolIsMutual,
ServerName: r.TLS.ServerName,
PeerCertificates: &ghttpproto.Certificates{
Cert: make([][]byte, len(r.TLS.PeerCertificates)),
},
VerifiedChains: make([]*ghttpproto.Certificates, len(r.TLS.VerifiedChains)),
SignedCertificateTimestamps: r.TLS.SignedCertificateTimestamps,
OcspResponse: r.TLS.OCSPResponse,
TlsUnique: r.TLS.TLSUnique,
}
for i, cert := range r.TLS.PeerCertificates {
req.Request.Tls.PeerCertificates.Cert[i] = cert.Raw
}
for i, chain := range r.TLS.VerifiedChains {
req.Request.Tls.VerifiedChains[i] = &ghttpproto.Certificates{
Cert: make([][]byte, len(chain)),
}
for j, cert := range chain {
req.Request.Tls.VerifiedChains[i].Cert[j] = cert.Raw
}
}
}
// TODO: is there a better way to handle this error?
_, _ = c.client.Handle(r.Context(), req)
}