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traces.go
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traces.go
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// Copyright 2022 Google LLC
//
// 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
//
// https://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 cloudmock
import (
"context"
"net"
"strings"
"sync"
"time"
"cloud.google.com/go/trace/apiv2/tracepb"
"google.golang.org/grpc"
"google.golang.org/grpc/metadata"
"google.golang.org/protobuf/types/known/emptypb"
)
type TracesTestServer struct {
lis net.Listener
srv *grpc.Server
// Endpoint where the gRPC server is listening
Endpoint string
userAgent string
batchWriteSpansRequests []*tracepb.BatchWriteSpansRequest
Retries int
mu sync.Mutex
}
func (t *TracesTestServer) Shutdown() {
t.srv.GracefulStop()
}
func (t *TracesTestServer) Serve() {
//nolint:errcheck
t.srv.Serve(t.lis)
}
type fakeTraceServiceServer struct {
tracepb.UnimplementedTraceServiceServer
tracesTestServer *TracesTestServer
cfg config
}
func (f *fakeTraceServiceServer) BatchWriteSpans(
ctx context.Context,
request *tracepb.BatchWriteSpansRequest,
) (*emptypb.Empty, error) {
time.Sleep(f.cfg.delay)
if f.cfg.responseErr != nil {
f.tracesTestServer.Retries++
return &emptypb.Empty{}, f.cfg.responseErr
}
f.tracesTestServer.appendBatchWriteSpansRequest(ctx, request)
return &emptypb.Empty{}, nil
}
func (t *TracesTestServer) appendBatchWriteSpansRequest(ctx context.Context, req *tracepb.BatchWriteSpansRequest) {
t.mu.Lock()
defer t.mu.Unlock()
t.batchWriteSpansRequests = append(t.batchWriteSpansRequests, req)
if md, ok := metadata.FromIncomingContext(ctx); ok {
t.userAgent = strings.Join(md.Get("User-Agent"), ";")
}
}
func (t *TracesTestServer) CreateBatchWriteSpansRequests() []*tracepb.BatchWriteSpansRequest {
t.mu.Lock()
defer t.mu.Unlock()
reqs := t.batchWriteSpansRequests
t.batchWriteSpansRequests = nil
return reqs
}
// Pops out the UserAgent from the most recent BatchWriteSpans.
func (t *TracesTestServer) UserAgent() string {
t.mu.Lock()
defer t.mu.Unlock()
ua := t.userAgent
t.userAgent = ""
return ua
}
func NewTracesTestServer(opts ...TraceServerOption) (*TracesTestServer, error) {
srv := grpc.NewServer()
lis, err := net.Listen("tcp", "localhost:0")
if err != nil {
return nil, err
}
testServer := &TracesTestServer{
Endpoint: lis.Addr().String(),
Retries: 0,
lis: lis,
srv: srv,
}
var c config
for _, option := range opts {
c = option.apply(c)
}
tracepb.RegisterTraceServiceServer(
srv,
&fakeTraceServiceServer{tracesTestServer: testServer, cfg: c},
)
return testServer, nil
}
type TraceServerOption interface {
apply(config) config
}
type config struct {
responseErr error
delay time.Duration
}
type optionFunc func(config) config
func (fn optionFunc) apply(cfg config) config {
return fn(cfg)
}
// WithDelay sets a delay on the test server before it responds.
func WithDelay(t time.Duration) TraceServerOption {
return optionFunc(func(cfg config) config {
cfg.delay = t
return cfg
})
}
func WithErrorResponse(err error) TraceServerOption {
return optionFunc(func(cfg config) config {
cfg.responseErr = err
return cfg
})
}