open-consul/agent/grpc/stats_test.go

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package grpc
import (
"context"
"net"
"sync"
"testing"
"time"
"github.com/armon/go-metrics"
"github.com/stretchr/testify/require"
"golang.org/x/sync/errgroup"
"google.golang.org/grpc"
"github.com/hashicorp/consul/agent/grpc/internal/testservice"
"github.com/hashicorp/consul/sdk/testutil/retry"
)
func noopRegister(*grpc.Server) {}
func TestHandler_EmitsStats(t *testing.T) {
sink := patchGlobalMetrics(t)
addr := &net.IPAddr{IP: net.ParseIP("127.0.0.1")}
handler := NewHandler(addr, noopRegister)
testservice.RegisterSimpleServer(handler.srv, &simple{})
lis, err := net.Listen("tcp", "127.0.0.1:0")
require.NoError(t, err)
t.Cleanup(logError(t, lis.Close))
ctx, cancel := context.WithCancel(context.Background())
t.Cleanup(cancel)
g, ctx := errgroup.WithContext(ctx)
g.Go(func() error {
return handler.srv.Serve(lis)
})
t.Cleanup(func() {
if err := handler.Shutdown(); err != nil {
t.Logf("grpc server shutdown: %v", err)
}
if err := g.Wait(); err != nil {
t.Logf("grpc server error: %v", err)
}
})
conn, err := grpc.DialContext(ctx, lis.Addr().String(), grpc.WithInsecure())
require.NoError(t, err)
t.Cleanup(logError(t, conn.Close))
client := testservice.NewSimpleClient(conn)
fClient, err := client.Flow(ctx, &testservice.Req{Datacenter: "mine"})
require.NoError(t, err)
// Wait for the first event so that we know the stream is sending.
_, err = fClient.Recv()
require.NoError(t, err)
cancel()
conn.Close()
handler.srv.GracefulStop()
// Wait for the server to stop so that active_streams is predictable.
require.NoError(t, g.Wait())
expectedGauge := []metricCall{
{key: []string{"testing", "grpc", "server", "active_conns"}, val: 1},
{key: []string{"testing", "grpc", "server", "active_streams"}, val: 1},
{key: []string{"testing", "grpc", "server", "active_conns"}, val: 0},
{key: []string{"testing", "grpc", "server", "active_streams"}, val: 0},
}
require.Equal(t, expectedGauge, sink.gaugeCalls)
expectedCounter := []metricCall{
{key: []string{"testing", "grpc", "server", "request"}, val: 1},
}
require.Equal(t, expectedCounter, sink.incrCounterCalls)
}
var fastRetry = &retry.Timer{Timeout: 7 * time.Second, Wait: 2 * time.Millisecond}
func patchGlobalMetrics(t *testing.T) *fakeMetricsSink {
t.Helper()
sink := &fakeMetricsSink{}
cfg := &metrics.Config{
ServiceName: "testing",
TimerGranularity: time.Millisecond, // Timers are in milliseconds
ProfileInterval: time.Second, // Poll runtime every second
FilterDefault: true,
}
var err error
defaultMetrics, err = metrics.New(cfg, sink)
require.NoError(t, err)
t.Cleanup(func() {
_, err = metrics.NewGlobal(cfg, &metrics.BlackholeSink{})
require.NoError(t, err, "failed to reset global metrics")
})
return sink
}
type fakeMetricsSink struct {
lock sync.Mutex
metrics.BlackholeSink
gaugeCalls []metricCall
incrCounterCalls []metricCall
}
func (f *fakeMetricsSink) SetGaugeWithLabels(key []string, val float32, labels []metrics.Label) {
f.lock.Lock()
f.gaugeCalls = append(f.gaugeCalls, metricCall{key: key, val: val, labels: labels})
f.lock.Unlock()
}
func (f *fakeMetricsSink) IncrCounterWithLabels(key []string, val float32, labels []metrics.Label) {
f.lock.Lock()
f.incrCounterCalls = append(f.incrCounterCalls, metricCall{key: key, val: val, labels: labels})
f.lock.Unlock()
}
type metricCall struct {
key []string
val float32
labels []metrics.Label
}
func logError(t *testing.T, f func() error) func() {
return func() {
if err := f(); err != nil {
t.Logf(err.Error())
}
}
}