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