Remove grpc-gateway dependency (#5060)

## Which problem is this PR solving?
- Part of #5052
- Continues #5054
- Closes #4911

## Description of the changes
- Replace grpc-gateway based implementation with manual HTTP
implementation from #5054
- Clean up spurious grpc-gateway usage (e.g. all-in-one test that did
not need it)
- Delete grpc-gateway step from `make proto` and remove the
corresponding generated file
- `go mod tidy` removes grpc-gateway and github.com/golang/protobuf

## How was this change tested?
- CI

---------

Signed-off-by: Yuri Shkuro <github@ysh.us>

Makefile.Protobuf.mk

@@ -77,7 +77,6 @@ define proto_compile
 
 endef
 
-# TODO add proto-hotrod to the list after regenerating its file (may need linter tweaking)
 .PHONY: proto
 proto: proto-model \
 	proto-api-v2 \
@@ -158,10 +157,3 @@ proto-api-v3:
 	find $(PATCHED_OTEL_PROTO_DIR) -name "*.proto" | xargs -L 1 $(SED) -i 's+go.opentelemetry.io/proto/otlp+github.com/jaegertracing/jaeger/proto-gen/otel+g'
 
 	$(call proto_compile, proto-gen/api_v3, idl/proto/api_v3/query_service.proto, -I$(PATCHED_OTEL_PROTO_DIR))
-
-	$(call print_caption, Generate API v3 gRPC Gateway)
-	$(PROTOC) \
-		$(PROTO_INCLUDES) \
-		-I$(PATCHED_OTEL_PROTO_DIR) \
- 		--grpc-gateway_out=logtostderr=true,grpc_api_configuration=idl/proto/api_v3/query_service_http.yaml,$(PROTO_GOGO_MAPPINGS):$(PWD)/proto-gen/api_v3 \
-		idl/proto/api_v3/query_service.proto

cmd/all-in-one/all_in_one_test.go

@@ -26,7 +26,6 @@ import (
 	"time"
 
 	"github.com/gogo/protobuf/jsonpb"
-	"github.com/grpc-ecosystem/grpc-gateway/runtime"
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
 
@@ -182,8 +181,7 @@ func getServicesAPIV3(t *testing.T) {
 	body, _ := io.ReadAll(resp.Body)
 
 	var servicesResponse api_v3.GetServicesResponse
-	jsonpb := runtime.JSONPb{}
-	err = jsonpb.Unmarshal(body, &servicesResponse)
+	err = json.Unmarshal(body, &servicesResponse)
 	require.NoError(t, err)
 	require.Len(t, servicesResponse.GetServices(), 1)
 	assert.Contains(t, servicesResponse.GetServices()[0], "jaeger")

cmd/query/app/apiv3/gateway_test.go

@@ -0,0 +1,193 @@
+// Copyright (c) 2021 The Jaeger Authors.
+//
+// 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 apiv3
+
+import (
+	"bytes"
+	"encoding/json"
+	"io"
+	"net/http"
+	"os"
+	"path"
+	"path/filepath"
+	"testing"
+
+	gogojsonpb "github.com/gogo/protobuf/jsonpb"
+	gogoproto "github.com/gogo/protobuf/proto"
+	"github.com/gorilla/mux"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+
+	"github.com/jaegertracing/jaeger/model"
+	_ "github.com/jaegertracing/jaeger/pkg/gogocodec" // force gogo codec registration
+	"github.com/jaegertracing/jaeger/pkg/tenancy"
+	"github.com/jaegertracing/jaeger/proto-gen/api_v3"
+	"github.com/jaegertracing/jaeger/storage/spanstore"
+	spanstoremocks "github.com/jaegertracing/jaeger/storage/spanstore/mocks"
+)
+
+// Utility functions used from http_gateway_test.go.
+
+const (
+	snapshotLocation = "./snapshots/"
+)
+
+// Snapshots can be regenerated via:
+//
+//	REGENERATE_SNAPSHOTS=true go test -v ./cmd/query/app/apiv3/...
+var regenerateSnapshots = os.Getenv("REGENERATE_SNAPSHOTS") == "true"
+
+type testGateway struct {
+	reader *spanstoremocks.Reader
+	url    string
+	router *mux.Router
+	// used to set a tenancy header when executing requests
+	setupRequest func(*http.Request)
+}
+
+func (gw *testGateway) execRequest(t *testing.T, url string) ([]byte, int) {
+	req, err := http.NewRequest(http.MethodGet, gw.url+url, nil)
+	require.NoError(t, err)
+	req.Header.Set("Content-Type", "application/json")
+	gw.setupRequest(req)
+	response, err := http.DefaultClient.Do(req)
+	require.NoError(t, err)
+	body, err := io.ReadAll(response.Body)
+	require.NoError(t, err)
+	require.NoError(t, response.Body.Close())
+	return body, response.StatusCode
+}
+
+func (gw *testGateway) verifySnapshot(t *testing.T, body []byte) []byte {
+	// reformat JSON body with indentation, to make diffing easier
+	var data interface{}
+	require.NoError(t, json.Unmarshal(body, &data), "response: %s", string(body))
+	body, err := json.MarshalIndent(data, "", "  ")
+	require.NoError(t, err)
+
+	testName := path.Base(t.Name())
+	snapshotFile := filepath.Join(snapshotLocation, testName+".json")
+	if regenerateSnapshots {
+		os.WriteFile(snapshotFile, body, 0o644)
+	}
+	snapshot, err := os.ReadFile(snapshotFile)
+	require.NoError(t, err)
+	assert.Equal(t, string(snapshot), string(body), "comparing against stored snapshot. Use REGENERATE_SNAPSHOTS=true to rebuild snapshots.")
+	return body
+}
+
+func parseResponse(t *testing.T, body []byte, obj gogoproto.Message) {
+	require.NoError(t, gogojsonpb.Unmarshal(bytes.NewBuffer(body), obj))
+}
+
+func makeTestTrace() (*model.Trace, model.TraceID) {
+	traceID := model.NewTraceID(150, 160)
+	return &model.Trace{
+		Spans: []*model.Span{
+			{
+				TraceID:       traceID,
+				SpanID:        model.NewSpanID(180),
+				OperationName: "foobar",
+			},
+		},
+	}, traceID
+}
+
+func runGatewayTests(
+	t *testing.T,
+	basePath string,
+	tenancyOptions tenancy.Options,
+	setupRequest func(*http.Request),
+) {
+	gw := setupHTTPGateway(t, basePath, tenancyOptions)
+	gw.setupRequest = setupRequest
+	t.Run("GetServices", gw.runGatewayGetServices)
+	t.Run("GetOperations", gw.runGatewayGetOperations)
+	t.Run("GetTrace", gw.runGatewayGetTrace)
+	t.Run("FindTraces", gw.runGatewayFindTraces)
+}
+
+func (gw *testGateway) runGatewayGetServices(t *testing.T) {
+	gw.reader.On("GetServices", matchContext).Return([]string{"foo"}, nil).Once()
+
+	body, statusCode := gw.execRequest(t, "/api/v3/services")
+	require.Equal(t, http.StatusOK, statusCode)
+	body = gw.verifySnapshot(t, body)
+
+	var response api_v3.GetServicesResponse
+	parseResponse(t, body, &response)
+	assert.Equal(t, []string{"foo"}, response.Services)
+}
+
+func (gw *testGateway) runGatewayGetOperations(t *testing.T) {
+	qp := spanstore.OperationQueryParameters{ServiceName: "foo", SpanKind: "server"}
+	gw.reader.
+		On("GetOperations", matchContext, qp).
+		Return([]spanstore.Operation{{Name: "get_users", SpanKind: "server"}}, nil).Once()
+
+	body, statusCode := gw.execRequest(t, "/api/v3/operations?service=foo&span_kind=server")
+	require.Equal(t, http.StatusOK, statusCode)
+	body = gw.verifySnapshot(t, body)
+
+	var response api_v3.GetOperationsResponse
+	parseResponse(t, body, &response)
+	require.Len(t, response.Operations, 1)
+	assert.Equal(t, "get_users", response.Operations[0].Name)
+	assert.Equal(t, "server", response.Operations[0].SpanKind)
+}
+
+func (gw *testGateway) runGatewayGetTrace(t *testing.T) {
+	trace, traceID := makeTestTrace()
+	gw.reader.On("GetTrace", matchContext, traceID).Return(trace, nil).Once()
+
+	body, statusCode := gw.execRequest(t, "/api/v3/traces/"+traceID.String())
+	require.Equal(t, http.StatusOK, statusCode, "response=%s", string(body))
+	body = gw.verifySnapshot(t, body)
+
+	var response api_v3.GRPCGatewayWrapper
+	parseResponse(t, body, &response)
+
+	assert.Len(t, response.Result.ResourceSpans, 1)
+	assert.Equal(t,
+		bytesOfTraceID(t, traceID.High, traceID.Low),
+		response.Result.ResourceSpans[0].ScopeSpans[0].Spans[0].TraceId)
+}
+
+func (gw *testGateway) runGatewayFindTraces(t *testing.T) {
+	trace, traceID := makeTestTrace()
+	q, qp := mockFindQueries()
+	gw.reader.
+		On("FindTraces", matchContext, qp).
+		Return([]*model.Trace{trace}, nil).Once()
+	body, statusCode := gw.execRequest(t, "/api/v3/traces?"+q.Encode())
+	require.Equal(t, http.StatusOK, statusCode, "response=%s", string(body))
+	body = gw.verifySnapshot(t, body)
+
+	var response api_v3.GRPCGatewayWrapper
+	parseResponse(t, body, &response)
+
+	assert.Len(t, response.Result.ResourceSpans, 1)
+	assert.Equal(t,
+		bytesOfTraceID(t, traceID.High, traceID.Low),
+		response.Result.ResourceSpans[0].ScopeSpans[0].Spans[0].TraceId)
+}
+
+func bytesOfTraceID(t *testing.T, high, low uint64) []byte {
+	traceID := model.NewTraceID(high, low)
+	buf := make([]byte, 16)
+	_, err := traceID.MarshalTo(buf)
+	require.NoError(t, err)
+	return buf
+}