/
stream.go
238 lines (205 loc) · 6.27 KB
/
stream.go
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package proxy
import (
"bytes"
"context"
"encoding/binary"
"io"
"math/rand"
"net"
"net/http"
"strconv"
"strings"
"time"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/metadata"
"google.golang.org/grpc/status"
"google.golang.org/grpc/transport"
)
type StreamHandler struct {
Logger logrus.FieldLogger
PortalOptions TargetOptions
}
func (s *StreamHandler) handleData(ctx context.Context, method, addr string, headers map[string][]string, data []byte) ([]byte, http.Header, error) {
host, port, err := net.SplitHostPort(addr)
if err != nil {
host = s.PortalOptions.ClientIP
port = "9985"
}
forwardedFor := headers["x-forwarded-for"]
if len(forwardedFor) > 0 {
host = strings.Split(forwardedFor[0], ",")[0]
}
dstHost := s.PortalOptions.Host
dstPort := s.PortalOptions.Port
conf := Config{
Host: dstHost,
Port: dstPort,
ScriptPath: s.PortalOptions.ScriptPath,
ScriptName: s.PortalOptions.ScriptName,
ClientIP: host,
ClientPort: port,
}
r := MakeRequest(conf)
s.Logger.WithFields(logrus.Fields{
"method": method,
"dsthost": dstHost,
"dstport": dstPort,
"scriptpath": conf.ScriptPath,
"scriptname": conf.ScriptName,
"datalen": len(data),
"headers": headers,
"data": bstringer(data),
}).Debug("making a request")
innerCtx := context.WithValue(ctx, "logruslogger", s.Logger)
// Three attempts to make request, because php can return error in first two ones.
// Also our fcgi client may had run out of id's
i := 0
for {
bdata, resHeaders, err := r.Do(innerCtx, method, headers, bytes.NewReader(data), i < 2)
if err != nil {
if i < 3 {
i++
continue
}
return nil, nil, errors.WithMessage(err, "failed to make FCGI request")
}
s.Logger.WithFields(logrus.Fields{
"method": method,
"dsthost": dstHost,
"dstport": dstPort,
"scriptpath": conf.ScriptPath,
"scriptname": conf.ScriptName,
"resHeaders": resHeaders,
"data": bstringer(bdata),
}).Debug("completed request")
return bdata, resHeaders, nil
}
}
func (s *StreamHandler) recvMsg(r io.Reader) (msg []byte, err error) {
var header [5]byte
if _, err := io.ReadFull(r, header[:]); err != nil {
return nil, errors.WithMessage(err, "failed to read grpc header")
}
typ := header[0]
length := binary.BigEndian.Uint32(header[1:])
s.Logger.WithFields(logrus.Fields{
"type": typ,
"length": length,
}).Debug("got msg header")
if length == 0 {
return nil, nil
}
msg = make([]byte, int(length))
if _, err := io.ReadFull(r, msg); err != nil {
if err == io.EOF {
err = io.ErrUnexpectedEOF
}
return nil, errors.WithMessage(err, "failed to read message body")
}
s.Logger.Debug("got message body")
return msg, nil
}
func copyHeaders(md metadata.MD, _ bool) map[string][]string {
// Add 10 just in case we will need to add additional headers
result := make(map[string][]string, len(md)+10)
for k, v := range md {
result[k] = v
}
return result
}
func (s *StreamHandler) HandleStream(ctx context.Context, ts *transport.Stream, t transport.ServerTransport) {
headers := copyHeaders(metadata.FromIncomingContext(ts.Context()))
requestId := getRequestId()
s.Logger = s.Logger.WithField("request_id", requestId)
// TODO: maybe we should move logging into context
if len(headers["global_request_id"]) != 0 {
s.Logger = s.Logger.WithField("global_request_id", headers["global_request_id"][0])
} else {
s.Logger = s.Logger.WithField("global_request_id", requestId)
headers["global_request_id"] = []string{requestId}
}
remoteAddr := t.RemoteAddr().String()
data, err := s.recvMsg(ts)
if err != nil {
s.Logger.WithError(err).Error("failed to receive a message")
t.WriteStatus(ts, status.New(codes.Unknown, "Failed to parse message"))
return
}
requestBegin := time.Now()
returnData, resHeaders, err := s.handleData(ctx, ts.Method(), remoteAddr, headers, data)
if err != nil {
s.Logger.WithError(err).Error("failed to handle a message")
t.WriteStatus(ts, status.New(codes.Unavailable, "Failed to send a message"))
return
}
if resHeaders["X-Grpc-Status"] != nil && len(resHeaders["X-Grpc-Status"]) > 0 && resHeaders["X-Grpc-Status"][0] == "ERROR" {
s.Logger.WithField("X-Grpc-Error-Description", resHeaders["X-Grpc-Error-Description"][0]).Error("Fast CGI Server has returned an error")
errorCode, err := getErrorCode(resHeaders)
if err != nil {
s.Logger.WithError(err).Error("Couldn't convert X-Grpc-Error-Code, using internal code")
}
if s.PortalOptions.ReturnError {
t.WriteStatus(ts, status.New(errorCode, getErrorDescription(errorCode, resHeaders)))
} else {
t.WriteStatus(ts, status.New(errorCode, errorCode.String()))
}
return
}
var header [5]byte
s.Logger.WithFields(logrus.Fields{
"type": header[0],
"length": len(returnData),
"time": time.Since(requestBegin),
}).Debug("returning result from FCGI")
binary.BigEndian.PutUint32(header[1:], uint32(len(returnData)))
opts := &transport.Options{
Last: true,
Delay: false,
}
err = t.Write(ts, header[:], returnData, opts)
s.Logger.WithError(err).Debug("write completed")
if err != nil {
switch err.(type) {
case transport.ConnectionError:
//TODO: Handle this
case transport.StreamError:
//TODO: Handle this
default:
//TODO: Handle this
}
t.WriteStatus(ts, status.New(codes.Unknown, "Failed to send message back"))
return
}
t.WriteStatus(ts, status.New(codes.OK, ""))
}
func getRequestId() string {
rnd := rand.New(rand.NewSource(time.Now().UnixNano()))
micro := time.Now().Truncate(time.Microsecond).UnixNano()
return strconv.FormatInt(micro, 10) + `.` + strconv.Itoa(rnd.Intn(500))
}
func getErrorCode(hr http.Header) (codes.Code, error) {
if hr["X-Grpc-Error-Code"] == nil {
return codes.Unknown, nil
}
code, err := strconv.Atoi(hr["X-Grpc-Error-Code"][0])
if err != nil {
return codes.Internal, err
}
return codes.Code(code), nil
}
func getErrorDescription(errorCode codes.Code, hr http.Header) string {
switch {
case errorCode == codes.Internal:
return "Internal service error"
case len(hr["X-Grpc-Error-Description"]) == 0:
return "Description of error has not been transfered"
default:
return hr["X-Grpc-Error-Description"][0]
}
}
type bstringer []byte
func (b bstringer) String() string {
return string(b)
}