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utkuozdemirutkuozdemir
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fix: propagate the headers before the message
Always propagate the headers via the proxy first, then attempt to receive the message. This fixes the issue where a connection sends the headers before the message, e.g., in the reverse GRPC tunnel implementation here: https://github.com/jhump/grpctunnel/blob/56803ed3149f539b95950ef306c01befa705ebe5/handler.go#L160-L164 Add new tests for the reverse tunnel. Signed-off-by: Utku Ozdemir <utku.ozdemir@siderolabs.com>
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‎go.mod

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require (
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github.com/golang/protobuf v1.5.4
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github.com/hashicorp/go-multierror v1.1.1
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github.com/jhump/grpctunnel v0.3.0
89
github.com/stretchr/testify v1.9.0
910
google.golang.org/grpc v1.67.1
1011
google.golang.org/protobuf v1.35.1
1112
)
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1314
require (
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github.com/davecgh/go-spew v1.1.1 // indirect
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github.com/fullstorydev/grpchan v1.1.1 // indirect
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github.com/hashicorp/errwrap v1.1.0 // indirect
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github.com/pmezard/go-difflib v1.0.0 // indirect
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golang.org/x/net v0.30.0 // indirect

‎go.sum

Lines changed: 104 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -1,31 +1,134 @@
1+
cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
2+
github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
3+
github.com/census-instrumentation/opencensus-proto v0.2.1/go.mod h1:f6KPmirojxKA12rnyqOA5BBL4O983OfeGPqjHWSTneU=
4+
github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
5+
github.com/cncf/udpa/go v0.0.0-20201120205902-5459f2c99403/go.mod h1:WmhPx2Nbnhtbo57+VJT5O0JRkEi1Wbu0z5j0R8u5Hbk=
6+
github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
17
github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
28
github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
9+
github.com/envoyproxy/go-control-plane v0.9.0/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
10+
github.com/envoyproxy/go-control-plane v0.9.1-0.20191026205805-5f8ba28d4473/go.mod h1:YTl/9mNaCwkRvm6d1a2C3ymFceY/DCBVvsKhRF0iEA4=
11+
github.com/envoyproxy/go-control-plane v0.9.9-0.20210217033140-668b12f5399d/go.mod h1:cXg6YxExXjJnVBQHBLXeUAgxn2UodCpnH306RInaBQk=
12+
github.com/envoyproxy/protoc-gen-validate v0.1.0/go.mod h1:iSmxcyjqTsJpI2R4NaDN7+kN2VEUnK/pcBlmesArF7c=
13+
github.com/fullstorydev/grpchan v1.1.1 h1:heQqIJlAv5Cnks9a70GRL2EJke6QQoUB25VGR6TZQas=
14+
github.com/fullstorydev/grpchan v1.1.1/go.mod h1:f4HpiV8V6htfY/K44GWV1ESQzHBTq7DinhzqQ95lpgc=
15+
github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
16+
github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
17+
github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
18+
github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
19+
github.com/golang/protobuf v1.4.0-rc.1/go.mod h1:ceaxUfeHdC40wWswd/P6IGgMaK3YpKi5j83Wpe3EHw8=
20+
github.com/golang/protobuf v1.4.0-rc.1.0.20200221234624-67d41d38c208/go.mod h1:xKAWHe0F5eneWXFV3EuXVDTCmh+JuBKY0li0aMyXATA=
21+
github.com/golang/protobuf v1.4.0-rc.2/go.mod h1:LlEzMj4AhA7rCAGe4KMBDvJI+AwstrUpVNzEA03Pprs=
22+
github.com/golang/protobuf v1.4.0-rc.4.0.20200313231945-b860323f09d0/go.mod h1:WU3c8KckQ9AFe+yFwt9sWVRKCVIyN9cPHBJSNnbL67w=
23+
github.com/golang/protobuf v1.4.0/go.mod h1:jodUvKwWbYaEsadDk5Fwe5c77LiNKVO9IDvqG2KuDX0=
24+
github.com/golang/protobuf v1.4.1/go.mod h1:U8fpvMrcmy5pZrNK1lt4xCsGvpyWQ/VVv6QDs8UjoX8=
25+
github.com/golang/protobuf v1.4.2/go.mod h1:oDoupMAO8OvCJWAcko0GGGIgR6R6ocIYbsSw735rRwI=
26+
github.com/golang/protobuf v1.5.0/go.mod h1:FsONVRAS9T7sI+LIUmWTfcYkHO4aIWwzhcaSAoJOfIk=
327
github.com/golang/protobuf v1.5.4 h1:i7eJL8qZTpSEXOPTxNKhASYpMn+8e5Q6AdndVa1dWek=
428
github.com/golang/protobuf v1.5.4/go.mod h1:lnTiLA8Wa4RWRcIUkrtSVa5nRhsEGBg48fD6rSs7xps=
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github.com/google/go-cmp v0.2.0/go.mod h1:oXzfMopK8JAjlY9xF4vHSVASa0yLyX7SntLO5aqRK0M=
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31+
github.com/google/go-cmp v0.3.1/go.mod h1:8QqcDgzrUqlUb/G2PQTWiueGozuR1884gddMywk6iLU=
32+
github.com/google/go-cmp v0.4.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
33+
github.com/google/go-cmp v0.5.0/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
34+
github.com/google/go-cmp v0.5.5/go.mod h1:v8dTdLbMG2kIc/vJvl+f65V22dbkXbowE6jgT/gNBxE=
535
github.com/google/go-cmp v0.6.0 h1:ofyhxvXcZhMsU5ulbFiLKl/XBFqE1GSq7atu8tAmTRI=
636
github.com/google/go-cmp v0.6.0/go.mod h1:17dUlkBOakJ0+DkrSSNjCkIjxS6bF9zb3elmeNGIjoY=
37+
github.com/google/uuid v1.1.2/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
738
github.com/hashicorp/errwrap v1.0.0/go.mod h1:YH+1FKiLXxHSkmPseP+kNlulaMuP3n2brvKWEqk/Jc4=
839
github.com/hashicorp/errwrap v1.1.0 h1:OxrOeh75EUXMY8TBjag2fzXGZ40LB6IKw45YeGUDY2I=
940
github.com/hashicorp/errwrap v1.1.0/go.mod h1:YH+1FKiLXxHSkmPseP+kNlulaMuP3n2brvKWEqk/Jc4=
1041
github.com/hashicorp/go-multierror v1.1.1 h1:H5DkEtf6CXdFp0N0Em5UCwQpXMWke8IA0+lD48awMYo=
1142
github.com/hashicorp/go-multierror v1.1.1/go.mod h1:iw975J/qwKPdAO1clOe2L8331t/9/fmwbPZ6JB6eMoM=
43+
github.com/jhump/gopoet v0.0.0-20190322174617-17282ff210b3/go.mod h1:me9yfT6IJSlOL3FCfrg+L6yzUEZ+5jW6WHt4Sk+UPUI=
44+
github.com/jhump/gopoet v0.1.0/go.mod h1:me9yfT6IJSlOL3FCfrg+L6yzUEZ+5jW6WHt4Sk+UPUI=
45+
github.com/jhump/goprotoc v0.5.0/go.mod h1:VrbvcYrQOrTi3i0Vf+m+oqQWk9l72mjkJCYo7UvLHRQ=
46+
github.com/jhump/grpctunnel v0.3.0 h1:itddWDKl7J4CeW4nzY3S/a1s7mPZUb8UtUzEhc/R8mg=
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github.com/jhump/grpctunnel v0.3.0/go.mod h1:dn5zls1F+1ftPMkbh4kVTVgGuY5t/v3ZgdjtnSMC3f4=
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github.com/jhump/protoreflect v1.11.0 h1:bvACHUD1Ua/3VxY4aAMpItKMhhwbimlKFJKsLsVgDjU=
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github.com/jhump/protoreflect v1.11.0/go.mod h1:U7aMIjN0NWq9swDP7xDdoMfRHb35uiuTd3Z9nFXJf5E=
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github.com/kr/pretty v0.1.0 h1:L/CwN0zerZDmRFUapSPitk6f+Q3+0za1rQkzVuMiMFI=
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github.com/kr/pretty v0.1.0/go.mod h1:dAy3ld7l9f0ibDNOQOHHMYYIIbhfbHSm3C4ZsoJORNo=
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github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ=
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github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE=
54+
github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI=
1255
github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=
1356
github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4=
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github.com/prometheus/client_model v0.0.0-20190812154241-14fe0d1b01d4/go.mod h1:xMI15A0UPsDsEKsMN9yxemIoYk6Tm2C1GtYGdfGttqA=
58+
github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
59+
github.com/stretchr/testify v1.5.1/go.mod h1:5W2xD1RspED5o8YsWQXVCued0rvSQ+mT+I5cxcmMvtA=
1460
github.com/stretchr/testify v1.9.0 h1:HtqpIVDClZ4nwg75+f6Lvsy/wHu+3BoSGCbBAcpTsTg=
1561
github.com/stretchr/testify v1.9.0/go.mod h1:r2ic/lqez/lEtzL7wO/rwa5dbSLXVDPFyf8C91i36aY=
62+
golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w=
63+
golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9/go.mod h1:LzIPMQfyMNhhGPhUkYOs5KpL4U8rLKemX1yGLhDgUto=
64+
golang.org/x/exp v0.0.0-20190121172915-509febef88a4/go.mod h1:CJ0aWSM057203Lf6IL+f9T1iT9GByDxfZKAQTCR3kQA=
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69+
golang.org/x/net v0.0.0-20180826012351-8a410e7b638d/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
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golang.org/x/net v0.0.0-20190213061140-3a22650c66bd/go.mod h1:mL1N/T3taQHkDXs73rZJwtUhF3w3ftmwwsq0BUmARs4=
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golang.org/x/net v0.0.0-20190311183353-d8887717615a/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
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golang.org/x/net v0.0.0-20190404232315-eb5bcb51f2a3/go.mod h1:t9HGtf8HONx5eT2rtn7q6eTqICYqUVnKs3thJo3Qplg=
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1674
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1775
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76+
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77+
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78+
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79+
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1887
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2192
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93+
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94+
golang.org/x/tools v0.0.0-20190114222345-bf090417da8b/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
95+
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23105
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109+
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24111
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‎proxy/handler_one2many.go

Lines changed: 22 additions & 24 deletions
Original file line numberDiff line numberDiff line change
@@ -123,9 +123,30 @@ func (s *handler) forwardClientsToServerMultiUnary(sources []backendConnection,
123123
return nil
124124
}
125125

126+
// Send the header metadata first
127+
md, err := src.clientStream.Header()
128+
if err != nil {
129+
var payload []byte
130+
131+
payload, err = s.formatError(false, src, err)
132+
if err != nil {
133+
return err
134+
}
135+
136+
payloadCh <- payload
137+
138+
return nil
139+
}
140+
141+
if md != nil {
142+
if err = dst.SetHeader(md); err != nil {
143+
return fmt.Errorf("error setting headers from client %s: %w", src.backend, err)
144+
}
145+
}
146+
126147
f := &frame{}
127148

128-
for j := 0; ; j++ {
149+
for {
129150
if err := src.clientStream.RecvMsg(f); err != nil {
130151
if errors.Is(err, io.EOF) {
131152
// This happens when the clientStream has nothing else to offer (io.EOF), returned a gRPC error. In those two
@@ -148,29 +169,6 @@ func (s *handler) forwardClientsToServerMultiUnary(sources []backendConnection,
148169
return nil
149170
}
150171

151-
if j == 0 {
152-
// This is a bit of a hack, but client to server headers are only readable after first client msg is
153-
// received but must be written to server stream before the first msg is flushed.
154-
// This is the only place to do it nicely.
155-
md, err := src.clientStream.Header()
156-
if err != nil {
157-
var payload []byte
158-
159-
payload, err = s.formatError(false, src, err)
160-
if err != nil {
161-
return err
162-
}
163-
164-
payloadCh <- payload
165-
166-
return nil
167-
}
168-
169-
if err := dst.SetHeader(md); err != nil {
170-
return fmt.Errorf("error setting headers from client %s: %w", src.backend, err)
171-
}
172-
}
173-
174172
var err error
175173

176174
f.payload, err = src.backend.AppendInfo(false, f.payload)

‎proxy/handler_one2one.go

Lines changed: 18 additions & 20 deletions
Original file line numberDiff line numberDiff line change
@@ -60,34 +60,32 @@ func (s *handler) forwardClientToServer(src *backendConnection, dst grpc.ServerS
6060
ret := make(chan error, 1)
6161

6262
go func() {
63-
f := NewFrame(nil)
63+
// Send the header metadata first
64+
md, err := src.clientStream.Header()
65+
if err != nil {
66+
ret <- err
6467

65-
for i := 0; ; i++ {
66-
if err := src.clientStream.RecvMsg(f); err != nil {
67-
ret <- err // this can be io.EOF which is happy case
68+
return
69+
}
6870

69-
break
70-
}
71+
if md != nil {
72+
if err = dst.SendHeader(md); err != nil {
73+
ret <- err
7174

72-
if i == 0 {
73-
// This is a bit of a hack, but client to server headers are only readable after first client msg is
74-
// received but must be written to server stream before the first msg is flushed.
75-
// This is the only place to do it nicely.
76-
md, err := src.clientStream.Header()
77-
if err != nil {
78-
ret <- err
75+
return
76+
}
77+
}
7978

80-
break
81-
}
79+
f := NewFrame(nil)
8280

83-
if err := dst.SendHeader(md); err != nil {
84-
ret <- err
81+
for {
82+
if err = src.clientStream.RecvMsg(f); err != nil {
83+
ret <- err // this can be io.EOF which is happy case
8584

86-
break
87-
}
85+
break
8886
}
8987

90-
if err := dst.SendMsg(f); err != nil {
88+
if err = dst.SendMsg(f); err != nil {
9189
ret <- err
9290

9391
break

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