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frontend_test.go
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frontend_test.go
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package v1
import (
"context"
"fmt"
"io"
"net"
"net/http"
"strings"
"testing"
"time"
"github.com/go-kit/log"
"github.com/gorilla/mux"
"github.com/grafana/dskit/flagext"
httpgrpc_server "github.com/grafana/dskit/httpgrpc/server"
"github.com/grafana/dskit/middleware"
"github.com/grafana/dskit/services"
"github.com/grafana/dskit/user"
otgrpc "github.com/opentracing-contrib/go-grpc"
"github.com/opentracing-contrib/go-stdlib/nethttp"
"github.com/opentracing/opentracing-go"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/testutil"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"github.com/uber/jaeger-client-go"
"github.com/uber/jaeger-client-go/config"
"go.uber.org/atomic"
"google.golang.org/grpc"
"github.com/grafana/loki/pkg/lokifrontend/frontend/transport"
"github.com/grafana/loki/pkg/lokifrontend/frontend/v1/frontendv1pb"
querier_worker "github.com/grafana/loki/pkg/querier/worker"
"github.com/grafana/loki/pkg/scheduler/queue"
)
const (
query = "/api/v1/query_range?end=1536716898&query=sum%28container_memory_rss%29+by+%28namespace%29&start=1536673680&step=120"
responseBody = `{"status":"success","data":{"resultType":"Matrix","result":[{"metric":{"foo":"bar"},"values":[[1536673680,"137"],[1536673780,"137"]]}]}}`
)
func TestFrontend(t *testing.T) {
handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
_, err := w.Write([]byte("Hello World"))
require.NoError(t, err)
})
test := func(addr string, _ *Frontend) {
req, err := http.NewRequest("GET", fmt.Sprintf("http://%s/", addr), nil)
require.NoError(t, err)
err = user.InjectOrgIDIntoHTTPRequest(user.InjectOrgID(context.Background(), "1"), req)
require.NoError(t, err)
resp, err := http.DefaultClient.Do(req)
require.NoError(t, err)
require.Equal(t, 200, resp.StatusCode)
body, err := io.ReadAll(resp.Body)
require.NoError(t, err)
assert.Equal(t, "Hello World", string(body))
}
testFrontend(t, defaultFrontendConfig(), handler, test, false, nil)
testFrontend(t, defaultFrontendConfig(), handler, test, true, nil)
}
func TestFrontendPropagateTrace(t *testing.T) {
closer, err := config.Configuration{}.InitGlobalTracer("test")
require.NoError(t, err)
defer closer.Close()
observedTraceID := make(chan string, 2)
handler := middleware.Tracer{}.Wrap(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
sp := opentracing.SpanFromContext(r.Context())
defer sp.Finish()
traceID := fmt.Sprintf("%v", sp.Context().(jaeger.SpanContext).TraceID())
observedTraceID <- traceID
_, err = w.Write([]byte(responseBody))
require.NoError(t, err)
}))
test := func(addr string, _ *Frontend) {
sp, ctx := opentracing.StartSpanFromContext(context.Background(), "client")
defer sp.Finish()
traceID := fmt.Sprintf("%v", sp.Context().(jaeger.SpanContext).TraceID())
req, err := http.NewRequest("GET", fmt.Sprintf("http://%s/%s", addr, query), nil)
require.NoError(t, err)
req = req.WithContext(ctx)
err = user.InjectOrgIDIntoHTTPRequest(user.InjectOrgID(ctx, "1"), req)
require.NoError(t, err)
req, tr := nethttp.TraceRequest(opentracing.GlobalTracer(), req)
defer tr.Finish()
client := http.Client{
Transport: &nethttp.Transport{},
}
resp, err := client.Do(req)
require.NoError(t, err)
require.Equal(t, 200, resp.StatusCode)
defer resp.Body.Close()
_, err = io.ReadAll(resp.Body)
require.NoError(t, err)
// Query should do one call.
assert.Equal(t, traceID, <-observedTraceID)
}
testFrontend(t, defaultFrontendConfig(), handler, test, false, nil)
testFrontend(t, defaultFrontendConfig(), handler, test, true, nil)
}
func TestFrontendCheckReady(t *testing.T) {
for _, tt := range []struct {
name string
connectedClients int
msg string
readyForRequests bool
}{
{"connected clients are ready", 3, "", true},
{"no url, no clients is not ready", 0, "not ready: number of queriers connected to query-frontend is 0", false},
} {
t.Run(tt.name, func(t *testing.T) {
qm := queue.NewMetrics("query_frontend", nil)
f := &Frontend{
log: log.NewNopLogger(),
requestQueue: queue.NewRequestQueue(5, 0, qm),
}
for i := 0; i < tt.connectedClients; i++ {
f.requestQueue.RegisterQuerierConnection("test")
}
err := f.CheckReady(context.Background())
errMsg := ""
if err != nil {
errMsg = err.Error()
}
require.Equal(t, tt.msg, errMsg)
})
}
}
// TestFrontendCancel ensures that when client requests are cancelled,
// the underlying query is correctly cancelled _and not retried_.
func TestFrontendCancel(t *testing.T) {
var tries atomic.Int32
handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
<-r.Context().Done()
tries.Inc()
})
test := func(addr string, _ *Frontend) {
req, err := http.NewRequest("GET", fmt.Sprintf("http://%s/", addr), nil)
require.NoError(t, err)
err = user.InjectOrgIDIntoHTTPRequest(user.InjectOrgID(context.Background(), "1"), req)
require.NoError(t, err)
ctx, cancel := context.WithCancel(context.Background())
req = req.WithContext(ctx)
go func() {
time.Sleep(100 * time.Millisecond)
cancel()
}()
_, err = http.DefaultClient.Do(req)
require.Error(t, err)
time.Sleep(100 * time.Millisecond)
assert.Equal(t, int32(1), tries.Load())
}
testFrontend(t, defaultFrontendConfig(), handler, test, false, nil)
tries.Store(0)
testFrontend(t, defaultFrontendConfig(), handler, test, true, nil)
}
func TestFrontendMetricsCleanup(t *testing.T) {
handler := http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
_, err := w.Write([]byte("Hello World"))
require.NoError(t, err)
})
for _, matchMaxConcurrency := range []bool{false, true} {
reg := prometheus.NewPedanticRegistry()
test := func(addr string, fr *Frontend) {
req, err := http.NewRequest("GET", fmt.Sprintf("http://%s/", addr), nil)
require.NoError(t, err)
err = user.InjectOrgIDIntoHTTPRequest(user.InjectOrgID(context.Background(), "1"), req)
require.NoError(t, err)
resp, err := http.DefaultClient.Do(req)
require.NoError(t, err)
require.Equal(t, 200, resp.StatusCode)
defer resp.Body.Close()
body, err := io.ReadAll(resp.Body)
require.NoError(t, err)
assert.Equal(t, "Hello World", string(body))
require.NoError(t, testutil.GatherAndCompare(reg, strings.NewReader(`
# HELP cortex_query_frontend_queue_length Number of queries in the queue.
# TYPE cortex_query_frontend_queue_length gauge
cortex_query_frontend_queue_length{user="1"} 0
`), "cortex_query_frontend_queue_length"))
fr.cleanupInactiveUserMetrics("1")
require.NoError(t, testutil.GatherAndCompare(reg, strings.NewReader(`
# HELP cortex_query_frontend_queue_length Number of queries in the queue.
# TYPE cortex_query_frontend_queue_length gauge
`), "cortex_query_frontend_queue_length"))
}
testFrontend(t, defaultFrontendConfig(), handler, test, matchMaxConcurrency, reg)
}
}
func testFrontend(t *testing.T, config Config, handler http.Handler, test func(addr string, frontend *Frontend), matchMaxConcurrency bool, reg prometheus.Registerer) {
logger := log.NewNopLogger()
var workerConfig querier_worker.Config
flagext.DefaultValues(&workerConfig)
workerConfig.MaxConcurrent = 1
// localhost:0 prevents firewall warnings on Mac OS X.
grpcListen, err := net.Listen("tcp", "localhost:0")
require.NoError(t, err)
workerConfig.FrontendAddress = grpcListen.Addr().String()
httpListen, err := net.Listen("tcp", "localhost:0")
require.NoError(t, err)
v1, err := New(config, limits{}, logger, reg)
require.NoError(t, err)
require.NotNil(t, v1)
require.NoError(t, services.StartAndAwaitRunning(context.Background(), v1))
defer func() {
require.NoError(t, services.StopAndAwaitTerminated(context.Background(), v1))
}()
grpcServer := grpc.NewServer(
grpc.StreamInterceptor(otgrpc.OpenTracingStreamServerInterceptor(opentracing.GlobalTracer())),
)
defer grpcServer.GracefulStop()
frontendv1pb.RegisterFrontendServer(grpcServer, v1)
// Default HTTP handler config.
handlerCfg := transport.HandlerConfig{}
flagext.DefaultValues(&handlerCfg)
rt := transport.AdaptGrpcRoundTripperToHTTPRoundTripper(v1)
r := mux.NewRouter()
r.PathPrefix("/").Handler(middleware.Merge(
middleware.AuthenticateUser,
middleware.Tracer{},
).Wrap(transport.NewHandler(handlerCfg, rt, logger, nil)))
httpServer := http.Server{
Handler: r,
}
defer httpServer.Shutdown(context.Background()) //nolint:errcheck
go httpServer.Serve(httpListen) //nolint:errcheck
go grpcServer.Serve(grpcListen) //nolint:errcheck
var worker services.Service
worker, err = querier_worker.NewQuerierWorker(workerConfig, nil, httpgrpc_server.NewServer(handler), logger, nil)
require.NoError(t, err)
require.NoError(t, services.StartAndAwaitRunning(context.Background(), worker))
test(httpListen.Addr().String(), v1)
require.NoError(t, services.StopAndAwaitTerminated(context.Background(), worker))
}
func defaultFrontendConfig() Config {
config := Config{}
flagext.DefaultValues(&config)
return config
}
type limits struct {
queriers int
}
func (l limits) MaxQueriersPerUser(_ string) int {
return l.queriers
}