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transcoder_test.go
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// Copyright 2023-2025 Buf Technologies, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package vanguard
import (
"bytes"
"context"
"fmt"
"io"
"net/http"
"net/http/httptest"
"strings"
"sync/atomic"
"testing"
"connectrpc.com/connect"
testv1 "connectrpc.com/vanguard/internal/gen/vanguard/test/v1"
"connectrpc.com/vanguard/internal/gen/vanguard/test/v1/testv1connect"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"google.golang.org/genproto/googleapis/api/httpbody"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/types/known/emptypb"
"google.golang.org/protobuf/types/known/wrapperspb"
)
const (
testDataString = "abc def ghi"
testCompressedDataString = "nop qrs tuv" // rot13 of above
)
func TestTranscoder_BufferTooLargeFails(t *testing.T) {
t.Parallel()
// Cases where we buffer:
// 1. Using envelopingReader for request (same codec and compression, no body prep) where
// client protocol is not enveloped, request does not include content-length header,
// and server protocol is enveloped. In this case, we must buffer the request to measure
// its size, so we can create an envelope to send to the server.
// 2. Similar to above, but reversed roles, using envelopingWriter for response.
// 3. Using envelopingWriter for response, but with gRPC-Web or Connect streaming protocols,
// where we must buffer the final special message.
// 4. Using transformingReader for request (different codec and/or compression or body prep).
// We must buffer request messages in all cases.
// 5. Similar to above, but reversed roles, using transformingWriter for response. This
// includes buffering of final special message for gRPC-Web and Connect streaming protocols.
// 6. Using errorWriter for response (failed unary RPC in Connect or REST protocol). The
// entire body must be buffered to construct the RPC error.
var interceptor testInterceptor
serveMux := http.NewServeMux()
serveMux.Handle(testv1connect.NewLibraryServiceHandler(
testv1connect.UnimplementedLibraryServiceHandler{},
connect.WithInterceptors(&interceptor),
))
serveMux.Handle(testv1connect.NewContentServiceHandler(
testv1connect.UnimplementedContentServiceHandler{},
connect.WithInterceptors(&interceptor),
))
type testClients struct {
contentClient testv1connect.ContentServiceClient
libClient testv1connect.LibraryServiceClient
}
type testRequest struct {
name string
clientOptions []connect.ClientOption
svcOpts []ServiceOption // Does not need to include WithMaxMessageBufferBytes
invoke func(testClients, http.Header, []proto.Message) (http.Header, []proto.Message, http.Header, error)
stream testStream
}
ctx := context.Background()
testCases := []struct {
name string
expectation func(*testing.T, http.ResponseWriter, *http.Request)
reqs []testRequest
}{
{
name: "enveloping_reader",
expectation: func(t *testing.T, _ http.ResponseWriter, req *http.Request) {
t.Helper()
_, ok := req.Body.(*envelopingReader)
assert.True(t, ok, "request body should be *envelopingReader")
},
reqs: []testRequest{
{
// Connect unary request; gRPC server
name: "must_buffer_request",
svcOpts: []ServiceOption{WithTargetProtocols(ProtocolGRPC)},
invoke: func(clients testClients, hdrs http.Header, msgs []proto.Message) (http.Header, []proto.Message, http.Header, error) {
return outputFromUnary(ctx, clients.libClient.GetBook, hdrs, msgs)
},
stream: testStream{
method: testv1connect.LibraryServiceGetBookProcedure,
msgs: []testMsg{{in: &testMsgIn{
msg: &testv1.GetBookRequest{Name: strings.Repeat("foo/", 1000)},
err: newConnectError(connect.CodeResourceExhausted, "buffer limit exceeded"),
}}},
},
},
},
},
{
name: "enveloping_writer",
expectation: func(t *testing.T, rsp http.ResponseWriter, _ *http.Request) {
t.Helper()
rw, ok := rsp.(*responseWriter)
require.True(t, ok, "response writer should be *responseWriter")
_, ok = rw.w.(*envelopingWriter)
assert.True(t, ok, "response body should be *envelopingWriter")
},
reqs: []testRequest{
{
// gRPC unary request; Connect server
name: "must_buffer_response",
clientOptions: []connect.ClientOption{connect.WithGRPC()},
svcOpts: []ServiceOption{WithTargetProtocols(ProtocolConnect)},
invoke: func(clients testClients, hdrs http.Header, msgs []proto.Message) (http.Header, []proto.Message, http.Header, error) {
return outputFromUnary(ctx, clients.libClient.GetBook, hdrs, msgs)
},
stream: testStream{
method: testv1connect.LibraryServiceGetBookProcedure,
msgs: []testMsg{
{in: &testMsgIn{
msg: &testv1.GetBookRequest{Name: "foo/bar"},
}},
{out: &testMsgOut{
msg: &testv1.Book{Name: strings.Repeat("foo/", 1000)},
}},
},
err: newConnectError(connect.CodeResourceExhausted, "buffer limit exceeded"),
},
},
{
// gRPC-Web response with trailers too large
name: "buffer_grpcweb_endstream_trailers",
svcOpts: []ServiceOption{WithTargetProtocols(ProtocolGRPCWeb)},
invoke: func(clients testClients, hdrs http.Header, msgs []proto.Message) (http.Header, []proto.Message, http.Header, error) {
return outputFromUnary(ctx, clients.libClient.GetBook, hdrs, msgs)
},
stream: testStream{
method: testv1connect.LibraryServiceGetBookProcedure,
msgs: []testMsg{
{in: &testMsgIn{
msg: &testv1.GetBookRequest{Name: "foo/bar"},
}},
{out: &testMsgOut{
msg: &testv1.Book{Name: "foo/bar"},
}},
},
rspTrailer: map[string][]string{
"Big-Trailer": {strings.Repeat("Blah-", 1000)},
},
err: newConnectError(connect.CodeResourceExhausted, "buffer limit exceeded"),
},
},
{
// gRPC-Web response with error too large
name: "buffer_grpcweb_endstream_error",
svcOpts: []ServiceOption{WithTargetProtocols(ProtocolGRPCWeb)},
invoke: func(clients testClients, hdrs http.Header, msgs []proto.Message) (http.Header, []proto.Message, http.Header, error) {
return outputFromServerStream(ctx, clients.contentClient.Download, hdrs, msgs)
},
stream: testStream{
method: testv1connect.ContentServiceDownloadProcedure,
msgs: []testMsg{
{in: &testMsgIn{
msg: &testv1.DownloadRequest{Filename: "foo/bar"},
}},
{out: &testMsgOut{
msg: &testv1.DownloadResponse{File: &httpbody.HttpBody{ContentType: "foo/bar"}},
}},
{out: &testMsgOut{
err: newConnectError(connect.CodeDataLoss, strings.Repeat("foo/", 1000)),
}},
},
err: newConnectError(connect.CodeResourceExhausted, "buffer limit exceeded"),
},
},
{
// Connect streaming response with error too large
name: "buffer_connect_endstream_trailers",
clientOptions: []connect.ClientOption{connect.WithGRPC()},
svcOpts: []ServiceOption{WithTargetProtocols(ProtocolConnect)},
invoke: func(clients testClients, hdrs http.Header, msgs []proto.Message) (http.Header, []proto.Message, http.Header, error) {
return outputFromServerStream(ctx, clients.contentClient.Download, hdrs, msgs)
},
stream: testStream{
method: testv1connect.ContentServiceDownloadProcedure,
msgs: []testMsg{
{in: &testMsgIn{
msg: &testv1.DownloadRequest{Filename: "foo/bar"},
}},
{out: &testMsgOut{
msg: &testv1.DownloadResponse{File: &httpbody.HttpBody{ContentType: "foo/bar"}},
}},
},
rspTrailer: map[string][]string{
"Big-Trailer": {strings.Repeat("Blah-", 1000)},
},
err: newConnectError(connect.CodeResourceExhausted, "buffer limit exceeded"),
},
},
{
// Connect streaming response with error too large
name: "buffer_connect_endstream_trailers",
clientOptions: []connect.ClientOption{connect.WithGRPC()},
svcOpts: []ServiceOption{WithTargetProtocols(ProtocolConnect)},
invoke: func(clients testClients, hdrs http.Header, msgs []proto.Message) (http.Header, []proto.Message, http.Header, error) {
return outputFromServerStream(ctx, clients.contentClient.Download, hdrs, msgs)
},
stream: testStream{
method: testv1connect.ContentServiceDownloadProcedure,
msgs: []testMsg{
{in: &testMsgIn{
msg: &testv1.DownloadRequest{Filename: "foo/bar"},
}},
{out: &testMsgOut{
msg: &testv1.DownloadResponse{File: &httpbody.HttpBody{ContentType: "foo/bar"}},
}},
{out: &testMsgOut{
err: newConnectError(connect.CodeDataLoss, strings.Repeat("foo/", 1000)),
}},
},
err: newConnectError(connect.CodeResourceExhausted, "buffer limit exceeded"),
},
},
},
},
{
name: "transforming_reader",
expectation: func(t *testing.T, _ http.ResponseWriter, req *http.Request) {
t.Helper()
_, ok := req.Body.(*transformingReader)
assert.True(t, ok, "request body should be *transformingReader")
},
reqs: []testRequest{
{
// Proto request transformed to JSON
name: "must_buffer_request_unary",
svcOpts: []ServiceOption{WithTargetCodecs(CodecJSON)},
invoke: func(clients testClients, hdrs http.Header, msgs []proto.Message) (http.Header, []proto.Message, http.Header, error) {
return outputFromUnary(ctx, clients.libClient.GetBook, hdrs, msgs)
},
stream: testStream{
method: testv1connect.LibraryServiceGetBookProcedure,
msgs: []testMsg{{in: &testMsgIn{
msg: &testv1.GetBookRequest{Name: strings.Repeat("foo/", 1000)},
err: newConnectError(connect.CodeResourceExhausted, "buffer limit exceeded"),
}}},
},
},
{
name: "must_buffer_request_stream",
svcOpts: []ServiceOption{WithTargetCodecs(CodecJSON)},
invoke: func(clients testClients, hdrs http.Header, msgs []proto.Message) (http.Header, []proto.Message, http.Header, error) {
return outputFromClientStream(ctx, clients.contentClient.Upload, hdrs, msgs)
},
stream: testStream{
method: testv1connect.ContentServiceUploadProcedure,
msgs: []testMsg{
{in: &testMsgIn{
msg: &testv1.UploadRequest{Filename: "foo/bar"},
}},
{in: &testMsgIn{
msg: &testv1.UploadRequest{File: &httpbody.HttpBody{Data: bytes.Repeat([]byte{0, 1, 2, 3}, 1000)}},
err: newConnectError(connect.CodeResourceExhausted, "buffer limit exceeded"),
}},
},
},
},
},
},
{
name: "transforming_writer",
expectation: func(t *testing.T, rsp http.ResponseWriter, _ *http.Request) {
t.Helper()
rw, ok := rsp.(*responseWriter)
require.True(t, ok, "response writer should be *responseWriter")
_, ok = rw.w.(*transformingWriter)
assert.True(t, ok, "response body should be *transformingWriter")
},
reqs: []testRequest{
{
// Proto response transformed to JSON
name: "must_buffer_response_unary",
svcOpts: []ServiceOption{WithTargetCodecs(CodecJSON)},
invoke: func(clients testClients, hdrs http.Header, msgs []proto.Message) (http.Header, []proto.Message, http.Header, error) {
return outputFromUnary(ctx, clients.libClient.GetBook, hdrs, msgs)
},
stream: testStream{
method: testv1connect.LibraryServiceGetBookProcedure,
msgs: []testMsg{
{in: &testMsgIn{
msg: &testv1.GetBookRequest{Name: "foo/bar"},
}},
{out: &testMsgOut{
msg: &testv1.Book{Name: strings.Repeat("foo/", 1000)},
}},
},
err: newConnectError(connect.CodeResourceExhausted, "buffer limit exceeded"),
},
},
{
name: "must_buffer_response_stream",
svcOpts: []ServiceOption{WithTargetCodecs(CodecJSON)},
invoke: func(clients testClients, hdrs http.Header, msgs []proto.Message) (http.Header, []proto.Message, http.Header, error) {
return outputFromServerStream(ctx, clients.contentClient.Download, hdrs, msgs)
},
stream: testStream{
method: testv1connect.ContentServiceDownloadProcedure,
msgs: []testMsg{
{in: &testMsgIn{
msg: &testv1.DownloadRequest{Filename: "foo/bar"},
}},
{out: &testMsgOut{
msg: &testv1.DownloadResponse{File: &httpbody.HttpBody{Data: []byte{0, 1, 2, 3}}},
}},
{out: &testMsgOut{
msg: &testv1.DownloadResponse{File: &httpbody.HttpBody{Data: bytes.Repeat([]byte{0, 1, 2, 3}, 1000)}},
err: newConnectError(connect.CodeResourceExhausted, "buffer limit exceeded"),
}},
},
},
},
{
// gRPC-Web response with trailers too large
name: "buffer_grpcweb_endstream_trailers",
svcOpts: []ServiceOption{WithTargetCodecs(CodecJSON), WithTargetProtocols(ProtocolGRPCWeb)},
invoke: func(clients testClients, hdrs http.Header, msgs []proto.Message) (http.Header, []proto.Message, http.Header, error) {
return outputFromUnary(ctx, clients.libClient.GetBook, hdrs, msgs)
},
stream: testStream{
method: testv1connect.LibraryServiceGetBookProcedure,
msgs: []testMsg{
{in: &testMsgIn{
msg: &testv1.GetBookRequest{Name: "foo/bar"},
}},
{out: &testMsgOut{
msg: &testv1.Book{Name: "foo/bar"},
}},
},
rspTrailer: map[string][]string{
"Big-Trailer": {strings.Repeat("Blah-", 1000)},
},
err: newConnectError(connect.CodeResourceExhausted, "buffer limit exceeded"),
},
},
{
// gRPC-Web response with error too large
name: "buffer_grpcweb_endstream_error",
svcOpts: []ServiceOption{WithTargetCodecs(CodecJSON), WithTargetProtocols(ProtocolGRPCWeb)},
invoke: func(clients testClients, hdrs http.Header, msgs []proto.Message) (http.Header, []proto.Message, http.Header, error) {
return outputFromServerStream(ctx, clients.contentClient.Download, hdrs, msgs)
},
stream: testStream{
method: testv1connect.ContentServiceDownloadProcedure,
msgs: []testMsg{
{in: &testMsgIn{
msg: &testv1.DownloadRequest{Filename: "foo/bar"},
}},
{out: &testMsgOut{
msg: &testv1.DownloadResponse{File: &httpbody.HttpBody{ContentType: "foo/bar"}},
}},
{out: &testMsgOut{
err: newConnectError(connect.CodeDataLoss, strings.Repeat("foo/", 1000)),
}},
},
err: newConnectError(connect.CodeResourceExhausted, "buffer limit exceeded"),
},
},
{
// Connect streaming response with error too large
name: "buffer_connect_endstream_trailers",
svcOpts: []ServiceOption{WithTargetCodecs(CodecJSON), WithTargetProtocols(ProtocolConnect)},
invoke: func(clients testClients, hdrs http.Header, msgs []proto.Message) (http.Header, []proto.Message, http.Header, error) {
return outputFromServerStream(ctx, clients.contentClient.Download, hdrs, msgs)
},
stream: testStream{
method: testv1connect.ContentServiceDownloadProcedure,
msgs: []testMsg{
{in: &testMsgIn{
msg: &testv1.DownloadRequest{Filename: "foo/bar"},
}},
{out: &testMsgOut{
msg: &testv1.DownloadResponse{File: &httpbody.HttpBody{ContentType: "foo/bar"}},
}},
},
rspTrailer: map[string][]string{
"Big-Trailer": {strings.Repeat("Blah-", 1000)},
},
err: newConnectError(connect.CodeResourceExhausted, "buffer limit exceeded"),
},
},
{
// Connect streaming response with error too large
name: "buffer_connect_endstream_trailers",
svcOpts: []ServiceOption{WithTargetCodecs(CodecJSON), WithTargetProtocols(ProtocolConnect)},
invoke: func(clients testClients, hdrs http.Header, msgs []proto.Message) (http.Header, []proto.Message, http.Header, error) {
return outputFromServerStream(ctx, clients.contentClient.Download, hdrs, msgs)
},
stream: testStream{
method: testv1connect.ContentServiceDownloadProcedure,
msgs: []testMsg{
{in: &testMsgIn{
msg: &testv1.DownloadRequest{Filename: "foo/bar"},
}},
{out: &testMsgOut{
msg: &testv1.DownloadResponse{File: &httpbody.HttpBody{ContentType: "foo/bar"}},
}},
{out: &testMsgOut{
err: newConnectError(connect.CodeDataLoss, strings.Repeat("foo/", 1000)),
}},
},
err: newConnectError(connect.CodeResourceExhausted, "buffer limit exceeded"),
},
},
},
},
{
name: "error_writer",
expectation: func(t *testing.T, rsp http.ResponseWriter, _ *http.Request) {
t.Helper()
rw, ok := rsp.(*responseWriter)
require.True(t, ok, "response writer should be *responseWriter")
_, ok = rw.w.(*errorWriter)
assert.True(t, ok, "response body should be *errorWriter")
},
reqs: []testRequest{
{
// gRPC request; Connect unary response with error
name: "must_buffer_error_response",
clientOptions: []connect.ClientOption{connect.WithGRPC()},
svcOpts: []ServiceOption{WithTargetProtocols(ProtocolConnect)},
invoke: func(clients testClients, hdrs http.Header, msgs []proto.Message) (http.Header, []proto.Message, http.Header, error) {
return outputFromUnary(ctx, clients.libClient.GetBook, hdrs, msgs)
},
stream: testStream{
method: testv1connect.LibraryServiceGetBookProcedure,
msgs: []testMsg{
{in: &testMsgIn{
msg: &testv1.GetBookRequest{Name: "foo/bar"},
}},
{out: &testMsgOut{
err: newConnectError(connect.CodeDataLoss, strings.Repeat("foo/", 1000)),
}},
},
err: newConnectError(connect.CodeResourceExhausted, "buffer limit exceeded"),
},
},
},
},
}
muxTestModes := []struct {
name string
optsOnService bool
makeMux func(*testRequest, []*Service) (http.Handler, error)
}{
{
name: "default_svc_opts",
optsOnService: false,
makeMux: func(req *testRequest, svcs []*Service) (http.Handler, error) {
opts := append(make([]ServiceOption, 0, len(req.svcOpts)+1), req.svcOpts...)
opts = append(opts, WithMaxMessageBufferBytes(1024))
return NewTranscoder(svcs, WithDefaultServiceOptions(opts...))
},
},
{
name: "per_svc_options",
optsOnService: true,
makeMux: func(_ *testRequest, svcs []*Service) (http.Handler, error) {
// svcs already have options defined on them
return NewTranscoder(svcs, WithDefaultServiceOptions(WithMaxMessageBufferBytes(1024)))
},
},
}
for _, testCase := range testCases {
t.Run(testCase.name, func(t *testing.T) {
t.Parallel()
for _, testReq := range testCase.reqs {
t.Run(testReq.name, func(t *testing.T) {
t.Parallel()
for _, mode := range muxTestModes {
t.Run(mode.name, func(t *testing.T) {
t.Parallel()
var expectationChecked atomic.Bool
rpcHandler := http.HandlerFunc(func(respWriter http.ResponseWriter, req *http.Request) {
serveMux.ServeHTTP(respWriter, req)
defer expectationChecked.Store(true)
testCase.expectation(t, respWriter, req)
})
var svcOpts []ServiceOption
if mode.optsOnService {
svcOpts = testReq.svcOpts
}
handler, err := mode.makeMux(&testReq, []*Service{
NewService(testv1connect.LibraryServiceName, rpcHandler, svcOpts...),
NewService(testv1connect.ContentServiceName, rpcHandler, svcOpts...),
})
require.NoError(t, err)
server := httptest.NewUnstartedServer(handler)
server.EnableHTTP2 = true
server.StartTLS()
disableCompression(server)
t.Cleanup(server.Close)
var clients testClients
// remove support for gzip, so we don't have to worry about compression
// getting in the way of our too-large test payloads
opts := make([]connect.ClientOption, 0, len(testReq.clientOptions)+1)
opts = append(opts, testReq.clientOptions...)
opts = append(opts, connect.WithAcceptCompression("gzip", nil, nil))
clients.libClient = testv1connect.NewLibraryServiceClient(server.Client(), server.URL, opts...)
clients.contentClient = testv1connect.NewContentServiceClient(server.Client(), server.URL, opts...)
runRPCTestCase(t, &interceptor, clients, testReq.invoke, testReq.stream)
assert.True(t, expectationChecked.Load())
})
}
})
}
})
}
}
func TestTranscoder_ConnectGetUsesPostIfRequestTooLarge(t *testing.T) {
t.Parallel()
var interceptor testInterceptor
_, svcHandler := testv1connect.NewLibraryServiceHandler(
testv1connect.UnimplementedLibraryServiceHandler{},
connect.WithInterceptors(
connect.UnaryInterceptorFunc(func(next connect.UnaryFunc) connect.UnaryFunc {
return func(ctx context.Context, req connect.AnyRequest) (connect.AnyResponse, error) {
if req.HTTPMethod() != http.MethodPost {
return nil, fmt.Errorf("server should only see POST; instead got %s", req.HTTPMethod())
}
return next(ctx, req)
}
}),
&interceptor,
),
)
handlerWithDefaultSvcOpt, err := NewTranscoder([]*Service{NewService(
testv1connect.LibraryServiceName,
svcHandler,
WithMaxGetURLBytes(512),
WithNoTargetCompression(),
)})
require.NoError(t, err)
serverWithDefaultSvcOpt := httptest.NewServer(handlerWithDefaultSvcOpt)
disableCompression(serverWithDefaultSvcOpt)
t.Cleanup(serverWithDefaultSvcOpt.Close)
handlerWithPerSvcOpt, err := NewTranscoder([]*Service{
NewService(
testv1connect.LibraryServiceName, svcHandler,
WithMaxGetURLBytes(512),
WithNoTargetCompression(),
),
})
require.NoError(t, err)
serverWithPerSvcOpt := httptest.NewServer(handlerWithPerSvcOpt)
disableCompression(serverWithPerSvcOpt)
t.Cleanup(serverWithPerSvcOpt.Close)
testCases := []struct {
name string
server *httptest.Server
}{
{
name: "with_default_svc_option",
server: serverWithDefaultSvcOpt,
},
{
name: "with_per_svc_option",
server: serverWithPerSvcOpt,
},
}
for _, testCase := range testCases {
t.Run(testCase.name, func(t *testing.T) {
t.Parallel()
largeRequest := &testv1.GetBookRequest{Name: strings.Repeat("foo/", 300) + "1"}
interceptor.set(t, testStream{
method: testv1connect.LibraryServiceGetBookProcedure,
msgs: []testMsg{
{in: &testMsgIn{
msg: largeRequest,
}},
{out: &testMsgOut{
msg: &testv1.Book{Name: strings.Repeat("foo/", 300) + "1"},
}},
},
})
defer interceptor.del(t)
ctx, cancel := context.WithTimeout(context.Background(), defaultTestTimeout)
defer cancel()
client := testv1connect.NewLibraryServiceClient(
testCase.server.Client(),
testCase.server.URL,
connect.WithHTTPGet(),
connect.WithHTTPGetMaxURLSize(512, false),
connect.WithSendGzip(),
)
req := connect.NewRequest(largeRequest)
req.Header().Set("Test", t.Name()) // must set this for interceptor to work
_, err := client.GetBook(ctx, req)
// No error means it made through above interceptor unscathed
// (so server handler got a POST).
require.NoError(t, err)
// But the client should have sent a GET, and the middleware should
// have changed to POST because the request URL was too large.
assert.Equal(t, http.MethodGet, req.HTTPMethod())
// Sanity check that an RPC with a small request fails due to the above interceptor requiring POST
// (Just to confirm that the above function is indeed intercepting the request).
//
// We don't need to reset the stream for the test interceptor to match the small request
// because that interceptor won't see it. The other interceptor function should fail the
// request before it gets that far.
req = connect.NewRequest(&testv1.GetBookRequest{Name: "foo/bar"})
req.Header().Set("Test", t.Name()) // must set this for interceptor to work
_, err = client.GetBook(ctx, req)
require.ErrorContains(t, err, "server should only see POST; instead got GET")
})
}
}
func TestTranscoder_Errors(t *testing.T) {
t.Parallel()
// These tests exercise error-handling in the way the operation is initialized.
// These tests should not reach the underlying handler or any particular protocol
// handler implementation (other than extracting request metadata).
rpcHandler := http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
http.Error(w, "nope", http.StatusTeapot)
})
services := []*Service{
NewService(testv1connect.LibraryServiceName, rpcHandler),
NewService(testv1connect.ContentServiceName, rpcHandler),
}
handler, err := NewTranscoder(services)
require.NoError(t, err)
unknownHandler, err := NewTranscoder(services, WithUnknownHandler(
http.HandlerFunc(func(writer http.ResponseWriter, _ *http.Request) {
writer.WriteHeader(http.StatusFailedDependency)
}),
))
require.NoError(t, err)
testCases := []struct {
name string
handler *Transcoder // use handler if nil
useHTTP1 bool
requestURL string
requestMethod string
requestHeaders map[string][]string
expectedCode int
expectedResponseHeaders map[string]string
}{
{
name: "multiple content types",
requestURL: "/service.Foo/Bar",
requestMethod: "GET",
requestHeaders: map[string][]string{
"Content-Type": {"application/proto", "application/json"},
},
expectedCode: http.StatusUnsupportedMediaType,
},
{
name: "no content type, looks like connect from header",
requestURL: "/service.Foo/Bar",
requestMethod: "DELETE",
requestHeaders: map[string][]string{
"Connect-Protocol-Version": {"1"},
},
expectedCode: http.StatusUnsupportedMediaType,
},
{
name: "no content type, looks like connect from query string",
requestURL: "/service.Foo/Bar?connect=v1",
requestMethod: "DELETE",
expectedCode: http.StatusUnsupportedMediaType,
},
{
name: "rest, route not found",
requestURL: "/foo/bar/baz:buzz",
requestMethod: "PUT",
requestHeaders: map[string][]string{
"Content-Type": {"application/json"},
},
expectedCode: http.StatusNotFound,
},
{
name: "connect stream, method not found",
requestURL: "/service.Foo/Bar",
requestMethod: "POST",
requestHeaders: map[string][]string{
"Content-Type": {"application/connect+proto"},
},
expectedCode: http.StatusNotFound,
},
{
name: "connect post, method not found",
requestURL: "/service.Foo/Bar",
requestMethod: "POST",
requestHeaders: map[string][]string{
"Connect-Protocol-Version": {"1"},
"Content-Type": {"application/proto"},
},
expectedCode: http.StatusNotFound,
},
{
name: "connect get, method not found",
requestURL: "/service.Foo/Bar?connect=v1",
requestMethod: "GET",
expectedCode: http.StatusNotFound,
},
{
name: "grpc, method not found",
requestURL: "/service.Foo/Bar",
requestMethod: "POST",
requestHeaders: map[string][]string{
"Content-Type": {"application/grpc+proto"},
},
expectedCode: http.StatusNotFound,
},
{
name: "grpc-web, method not found",
requestURL: "/service.Foo/Bar",
requestMethod: "POST",
requestHeaders: map[string][]string{
"Content-Type": {"application/grpc-web+proto"},
},
expectedCode: http.StatusNotFound,
},
{
name: "connect get, method not idempotent",
requestURL: "/vanguard.test.v1.LibraryService/CreateBook?connect=v1",
requestMethod: "GET",
expectedCode: http.StatusMethodNotAllowed,
expectedResponseHeaders: map[string]string{
"Allow": "POST",
},
},
{
name: "connect unary, bad HTTP method",
requestURL: "/vanguard.test.v1.LibraryService/GetBook",
requestMethod: "DELETE",
requestHeaders: map[string][]string{
"Connect-Protocol-Version": {"1"},
"Content-Type": {"application/proto"},
},
expectedCode: http.StatusMethodNotAllowed,
expectedResponseHeaders: map[string]string{
"Allow": "POST",
},
},
{
name: "connect stream, bad HTTP method",
requestURL: "/vanguard.test.v1.ContentService/Download",
requestMethod: "GET",
requestHeaders: map[string][]string{
"Content-Type": {"application/connect+proto"},
},
expectedCode: http.StatusMethodNotAllowed,
expectedResponseHeaders: map[string]string{
"Allow": "POST",
},
},
{
name: "grpc, bad HTTP method",
requestURL: "/vanguard.test.v1.LibraryService/GetBook",
requestMethod: "PUT",
requestHeaders: map[string][]string{
"Content-Type": {"application/grpc+proto"},
},
expectedCode: http.StatusMethodNotAllowed,
expectedResponseHeaders: map[string]string{
"Allow": "POST",
},
},
{
name: "grpc-web, bad HTTP method",
requestURL: "/vanguard.test.v1.LibraryService/GetBook",
requestMethod: "PATCH",
requestHeaders: map[string][]string{
"Content-Type": {"application/grpc-web+proto"},
},
expectedCode: http.StatusMethodNotAllowed,
expectedResponseHeaders: map[string]string{
"Allow": "POST",
},
},
{
name: "rest, unknown codec",
requestURL: "/v1/shelves/reference-123/books/isbn-0000111230012",
requestMethod: "GET",
requestHeaders: map[string][]string{
"Content-Type": {"application/foo"},
},
expectedCode: http.StatusUnsupportedMediaType,
},
{
name: "connect stream, unknown codec",
requestURL: "/vanguard.test.v1.ContentService/Download",
requestMethod: "POST",
requestHeaders: map[string][]string{
"Content-Type": {"application/connect+text"},
},
expectedCode: http.StatusUnsupportedMediaType,
},
{
name: "connect post, unknown codec",
requestURL: "/vanguard.test.v1.LibraryService/GetBook",
requestMethod: "POST",
requestHeaders: map[string][]string{
"Connect-Protocol-Version": {"1"},
"Content-Type": {"application/text"},
},
expectedCode: http.StatusUnsupportedMediaType,
},
{
name: "connect get, unknown codec",
requestURL: "/vanguard.test.v1.LibraryService/GetBook?connect=v1&encoding=text",
requestMethod: "GET",
expectedCode: http.StatusUnsupportedMediaType,
},
{
name: "grpc, unknown codec",
requestURL: "/vanguard.test.v1.LibraryService/GetBook",
requestMethod: "POST",
requestHeaders: map[string][]string{
"Content-Type": {"application/grpc+text"},
},
expectedCode: http.StatusUnsupportedMediaType,
},
{
name: "grpc-web, unknown codec",
requestURL: "/vanguard.test.v1.LibraryService/GetBook",
requestMethod: "POST",
requestHeaders: map[string][]string{
"Content-Type": {"application/grpc-web+text"},
},
expectedCode: http.StatusUnsupportedMediaType,
},
{
name: "rest, unknown compression",
requestURL: "/v1/shelves/reference-123/books/isbn-0000111230012",
requestMethod: "GET",
requestHeaders: map[string][]string{
"Content-Type": {"application/json"},
"Content-Encoding": {"blah"},
},
expectedCode: http.StatusUnsupportedMediaType,
},
{
name: "connect stream, unknown compression",
requestURL: "/vanguard.test.v1.ContentService/Download",
requestMethod: "POST",
requestHeaders: map[string][]string{
"Content-Type": {"application/connect+proto"},
"Connect-Content-Encoding": {"blah"},
},
expectedCode: http.StatusUnsupportedMediaType,
},
{
name: "connect post, unknown compression",
requestURL: "/vanguard.test.v1.LibraryService/GetBook",
requestMethod: "POST",
requestHeaders: map[string][]string{
"Connect-Protocol-Version": {"1"},
"Content-Type": {"application/proto"},
"Content-Encoding": {"blah"},
},
expectedCode: http.StatusUnsupportedMediaType,
},
{
name: "connect get, unknown compression",
requestURL: "/vanguard.test.v1.LibraryService/GetBook?connect=v1&encoding=proto&compression=blah",
requestMethod: "GET",
expectedCode: http.StatusUnsupportedMediaType,
},
{
name: "grpc, unknown compression",
requestURL: "/vanguard.test.v1.LibraryService/GetBook",
requestMethod: "POST",
requestHeaders: map[string][]string{
"Content-Type": {"application/grpc+proto"},
"Grpc-Encoding": {"blah"},
},
expectedCode: http.StatusUnsupportedMediaType,
},
{
name: "grpc-web, unknown compression",
requestURL: "/vanguard.test.v1.LibraryService/GetBook",
requestMethod: "POST",
requestHeaders: map[string][]string{
"Content-Type": {"application/grpc-web+proto"},
"Grpc-Encoding": {"blah"},
},
expectedCode: http.StatusUnsupportedMediaType,
},
{
name: "connect stream, bidi and http 1.1",
useHTTP1: true,
requestURL: "/vanguard.test.v1.ContentService/Subscribe",
requestMethod: "POST",
requestHeaders: map[string][]string{
"Content-Type": {"application/connect+proto"},
},
expectedCode: http.StatusHTTPVersionNotSupported,
},
{
name: "grpc, bidi and http 1.1",
useHTTP1: true,
requestURL: "/vanguard.test.v1.ContentService/Subscribe",
requestMethod: "POST",
requestHeaders: map[string][]string{
"Content-Type": {"application/grpc+proto"},
},
expectedCode: http.StatusHTTPVersionNotSupported,
},
{
name: "grpc-web, bidi and http 1.1",
useHTTP1: true,
requestURL: "/vanguard.test.v1.ContentService/Subscribe",
requestMethod: "POST",
requestHeaders: map[string][]string{
"Content-Type": {"application/grpc-web+proto"},
},
expectedCode: http.StatusHTTPVersionNotSupported,
},
{
name: "connect post, stream method",
requestURL: "/vanguard.test.v1.ContentService/Download",
requestMethod: "POST",
requestHeaders: map[string][]string{
"Connect-Protocol-Version": {"1"},
"Content-Type": {"application/proto"},
},
expectedCode: http.StatusUnsupportedMediaType,
},
{
name: "connect stream, unary method",
requestURL: "/vanguard.test.v1.LibraryService/GetBook",
requestMethod: "POST",
requestHeaders: map[string][]string{
"Content-Type": {"application/connect+proto"},
},
expectedCode: http.StatusUnsupportedMediaType,
},
{
name: "unknown handler",
handler: unknownHandler,
requestURL: "/vanguard.test.v1.LibraryService/UnknownMethod",
requestMethod: "POST",
requestHeaders: map[string][]string{
"Content-Type": {"application/connect+proto"},
},
expectedCode: http.StatusFailedDependency,
},
}
for _, testCase := range testCases {
t.Run(testCase.name, func(t *testing.T) {
t.Parallel()
vanguardHandler := handler
if testCase.handler != nil {
vanguardHandler = testCase.handler
}
req := httptest.NewRequest(testCase.requestMethod, testCase.requestURL, http.NoBody)
if testCase.useHTTP1 {
req.Proto = "HTTP/1.1"
req.ProtoMajor, req.ProtoMinor = 1, 1
} else {
req.Proto = "HTTP/2"
req.ProtoMajor, req.ProtoMinor = 2, 0
}