mirror of https://github.com/kubernetes/kops.git
469 lines
13 KiB
Go
469 lines
13 KiB
Go
// Copyright 2016 Google Inc. All Rights Reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package trace
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import (
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"encoding/json"
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"errors"
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"io/ioutil"
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"net/http"
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"reflect"
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"strings"
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"sync"
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"testing"
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"time"
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"cloud.google.com/go/datastore"
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"cloud.google.com/go/internal/testutil"
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"cloud.google.com/go/storage"
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"golang.org/x/net/context"
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api "google.golang.org/api/cloudtrace/v1"
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compute "google.golang.org/api/compute/v1"
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"google.golang.org/api/option"
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dspb "google.golang.org/genproto/googleapis/datastore/v1"
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"google.golang.org/grpc"
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)
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const testProjectID = "testproject"
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type fakeRoundTripper struct {
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reqc chan *http.Request
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}
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func newFakeRoundTripper() *fakeRoundTripper {
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return &fakeRoundTripper{reqc: make(chan *http.Request)}
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}
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func (rt *fakeRoundTripper) RoundTrip(r *http.Request) (*http.Response, error) {
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rt.reqc <- r
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resp := &http.Response{
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Status: "200 OK",
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StatusCode: 200,
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Body: ioutil.NopCloser(strings.NewReader("{}")),
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}
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return resp, nil
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}
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func newTestClient(rt http.RoundTripper) *Client {
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t, err := NewClient(context.Background(), testProjectID, option.WithHTTPClient(&http.Client{Transport: rt}))
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if err != nil {
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panic(err)
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}
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return t
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}
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type fakeDatastoreServer struct {
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dspb.DatastoreServer
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fail bool
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}
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func (f *fakeDatastoreServer) Lookup(ctx context.Context, req *dspb.LookupRequest) (*dspb.LookupResponse, error) {
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if f.fail {
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return nil, errors.New("failed!")
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}
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return &dspb.LookupResponse{}, nil
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}
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// makeRequests makes some requests.
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// req is an incoming request used to construct the trace. traceClient is the
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// client used to upload the trace. rt is the trace client's http client's
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// transport. This is used to retrieve the trace uploaded by the client, if
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// any. If expectTrace is true, we expect a trace will be uploaded. If
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// synchronous is true, the call to Finish is expected not to return before the
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// client has uploaded any traces.
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func makeRequests(t *testing.T, req *http.Request, traceClient *Client, rt *fakeRoundTripper, synchronous bool, expectTrace bool) *http.Request {
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span := traceClient.SpanFromRequest(req)
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ctx := NewContext(context.Background(), span)
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// An HTTP request.
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{
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req2, err := http.NewRequest("GET", "http://example.com/bar", nil)
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if err != nil {
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t.Fatal(err)
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}
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resp := &http.Response{StatusCode: 200}
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s := span.NewRemoteChild(req2)
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s.Finish(WithResponse(resp))
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}
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// An autogenerated API call.
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{
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rt := &fakeRoundTripper{reqc: make(chan *http.Request, 1)}
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hc := &http.Client{Transport: rt}
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computeClient, err := compute.New(hc)
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if err != nil {
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t.Fatal(err)
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}
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_, err = computeClient.Zones.List(testProjectID).Context(ctx).Do()
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if err != nil {
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t.Fatal(err)
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}
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}
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// A cloud library call that uses the autogenerated API.
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{
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rt := &fakeRoundTripper{reqc: make(chan *http.Request, 1)}
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hc := &http.Client{Transport: rt}
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storageClient, err := storage.NewClient(context.Background(), option.WithHTTPClient(hc))
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if err != nil {
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t.Fatal(err)
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}
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var objAttrsList []*storage.ObjectAttrs
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it := storageClient.Bucket("testbucket").Objects(ctx, nil)
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for {
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objAttrs, err := it.Next()
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if err != nil && err != storage.Done {
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t.Fatal(err)
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}
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if err == storage.Done {
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break
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}
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objAttrsList = append(objAttrsList, objAttrs)
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}
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}
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// A cloud library call that uses grpc internally.
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for _, fail := range []bool{false, true} {
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srv, err := testutil.NewServer()
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if err != nil {
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t.Fatalf("creating test datastore server: %v", err)
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}
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dspb.RegisterDatastoreServer(srv.Gsrv, &fakeDatastoreServer{fail: fail})
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srv.Start()
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conn, err := grpc.Dial(srv.Addr, grpc.WithInsecure(), EnableGRPCTracingDialOption)
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if err != nil {
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t.Fatalf("connecting to test datastore server: %v", err)
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}
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datastoreClient, err := datastore.NewClient(ctx, testProjectID, option.WithGRPCConn(conn))
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if err != nil {
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t.Fatalf("creating datastore client: %v", err)
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}
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k := datastore.NewKey(ctx, "Entity", "stringID", 0, nil)
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e := new(datastore.Entity)
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datastoreClient.Get(ctx, k, e)
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}
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done := make(chan struct{})
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go func() {
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if synchronous {
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err := span.FinishWait()
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if err != nil {
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t.Errorf("Unexpected error from span.FinishWait: %v", err)
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}
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} else {
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span.Finish()
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}
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done <- struct{}{}
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}()
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if !expectTrace {
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<-done
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select {
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case <-rt.reqc:
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t.Errorf("Got a trace, expected none.")
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case <-time.After(5 * time.Millisecond):
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}
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return nil
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} else if !synchronous {
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<-done
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return <-rt.reqc
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} else {
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select {
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case <-done:
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t.Errorf("Synchronous Finish didn't wait for trace upload.")
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return <-rt.reqc
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case <-time.After(5 * time.Millisecond):
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r := <-rt.reqc
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<-done
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return r
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}
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}
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}
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func TestTrace(t *testing.T) {
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testTrace(t, false)
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}
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func TestTraceWithWait(t *testing.T) {
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testTrace(t, true)
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}
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func testTrace(t *testing.T, synchronous bool) {
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req, err := http.NewRequest("GET", "http://example.com/foo", nil)
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if err != nil {
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t.Fatal(err)
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}
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req.Header["X-Cloud-Trace-Context"] = []string{`0123456789ABCDEF0123456789ABCDEF/42;o=3`}
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rt := newFakeRoundTripper()
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traceClient := newTestClient(rt)
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uploaded := makeRequests(t, req, traceClient, rt, synchronous, true)
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if uploaded == nil {
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t.Fatalf("No trace uploaded, expected one.")
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}
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expected := api.Traces{
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Traces: []*api.Trace{
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{
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ProjectId: testProjectID,
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Spans: []*api.TraceSpan{
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{
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Kind: "RPC_CLIENT",
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Labels: map[string]string{
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"trace.cloud.google.com/http/host": "example.com",
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"trace.cloud.google.com/http/method": "GET",
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"trace.cloud.google.com/http/status_code": "200",
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"trace.cloud.google.com/http/url": "http://example.com/bar",
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},
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Name: "/bar",
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},
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{
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Kind: "RPC_CLIENT",
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Labels: map[string]string{
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"trace.cloud.google.com/http/host": "www.googleapis.com",
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"trace.cloud.google.com/http/method": "GET",
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"trace.cloud.google.com/http/status_code": "200",
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"trace.cloud.google.com/http/url": "https://www.googleapis.com/compute/v1/projects/testproject/zones",
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},
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Name: "/compute/v1/projects/testproject/zones",
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},
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{
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Kind: "RPC_CLIENT",
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Labels: map[string]string{
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"trace.cloud.google.com/http/host": "www.googleapis.com",
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"trace.cloud.google.com/http/method": "GET",
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"trace.cloud.google.com/http/status_code": "200",
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"trace.cloud.google.com/http/url": "https://www.googleapis.com/storage/v1/b/testbucket/o",
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},
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Name: "/storage/v1/b/testbucket/o",
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},
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&api.TraceSpan{
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Kind: "RPC_CLIENT",
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Labels: nil,
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Name: "/google.datastore.v1.Datastore/Lookup",
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},
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&api.TraceSpan{
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Kind: "RPC_CLIENT",
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Labels: map[string]string{"error": "rpc error: code = 2 desc = failed!"},
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Name: "/google.datastore.v1.Datastore/Lookup",
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},
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{
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Kind: "RPC_SERVER",
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Labels: map[string]string{
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"trace.cloud.google.com/http/host": "example.com",
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"trace.cloud.google.com/http/method": "GET",
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"trace.cloud.google.com/http/url": "http://example.com/foo",
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},
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Name: "/foo",
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},
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},
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TraceId: "0123456789ABCDEF0123456789ABCDEF",
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},
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},
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}
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body, err := ioutil.ReadAll(uploaded.Body)
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if err != nil {
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t.Fatal(err)
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}
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var patch api.Traces
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err = json.Unmarshal(body, &patch)
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if err != nil {
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t.Fatal(err)
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}
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if len(patch.Traces) != len(expected.Traces) || len(patch.Traces[0].Spans) != len(expected.Traces[0].Spans) {
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got, _ := json.Marshal(patch)
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want, _ := json.Marshal(expected)
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t.Fatalf("PatchTraces request: got %s want %s", got, want)
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}
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n := len(patch.Traces[0].Spans)
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rootSpan := patch.Traces[0].Spans[n-1]
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for i, s := range patch.Traces[0].Spans {
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if a, b := s.StartTime, s.EndTime; a > b {
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t.Errorf("span %d start time is later than its end time (%q, %q)", i, a, b)
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}
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if a, b := rootSpan.StartTime, s.StartTime; a > b {
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t.Errorf("trace start time is later than span %d start time (%q, %q)", i, a, b)
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}
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if a, b := s.EndTime, rootSpan.EndTime; a > b {
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t.Errorf("span %d end time is later than trace end time (%q, %q)", i, a, b)
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}
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if i > 1 && i < n-1 {
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if a, b := patch.Traces[0].Spans[i-1].EndTime, s.StartTime; a > b {
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t.Errorf("span %d end time is later than span %d start time (%q, %q)", i-1, i, a, b)
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}
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}
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}
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if x := rootSpan.ParentSpanId; x != 42 {
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t.Errorf("Incorrect ParentSpanId: got %d want %d", x, 42)
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}
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for i, s := range patch.Traces[0].Spans {
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if x, y := rootSpan.SpanId, s.ParentSpanId; i < n-1 && x != y {
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t.Errorf("Incorrect ParentSpanId in span %d: got %d want %d", i, y, x)
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}
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}
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for i, s := range patch.Traces[0].Spans {
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s.EndTime = ""
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labels := &expected.Traces[0].Spans[i].Labels
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for key, value := range *labels {
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if v, ok := s.Labels[key]; !ok {
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t.Errorf("Span %d is missing Label %q:%q", i, key, value)
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} else if key == "trace.cloud.google.com/http/url" {
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if !strings.HasPrefix(v, value) {
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t.Errorf("Span %d Label %q: got value %q want prefix %q", i, key, v, value)
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}
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} else if v != value {
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t.Errorf("Span %d Label %q: got value %q want %q", i, key, v, value)
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}
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}
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for key := range s.Labels {
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if _, ok := (*labels)[key]; key != "trace.cloud.google.com/stacktrace" && !ok {
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t.Errorf("Span %d: unexpected label %q", i, key)
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}
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}
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*labels = nil
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s.Labels = nil
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s.ParentSpanId = 0
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if s.SpanId == 0 {
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t.Errorf("Incorrect SpanId: got 0 want nonzero")
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}
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s.SpanId = 0
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s.StartTime = ""
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}
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if !reflect.DeepEqual(patch, expected) {
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got, _ := json.Marshal(patch)
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want, _ := json.Marshal(expected)
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t.Errorf("PatchTraces request: got %s want %s", got, want)
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}
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}
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func TestNoTrace(t *testing.T) {
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testNoTrace(t, false)
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}
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func TestNoTraceWithWait(t *testing.T) {
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testNoTrace(t, true)
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}
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func testNoTrace(t *testing.T, synchronous bool) {
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for _, header := range []string{
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`0123456789ABCDEF0123456789ABCDEF/42;o=2`,
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`0123456789ABCDEF0123456789ABCDEF/42;o=0`,
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`0123456789ABCDEF0123456789ABCDEF/42`,
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`0123456789ABCDEF0123456789ABCDEF`,
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``,
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} {
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req, err := http.NewRequest("GET", "http://example.com/foo", nil)
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if header != "" {
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req.Header["X-Cloud-Trace-Context"] = []string{header}
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}
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if err != nil {
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t.Fatal(err)
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}
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rt := newFakeRoundTripper()
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traceClient := newTestClient(rt)
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uploaded := makeRequests(t, req, traceClient, rt, synchronous, false)
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if uploaded != nil {
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t.Errorf("Got a trace, expected none.")
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}
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}
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}
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func TestSample(t *testing.T) {
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// A deterministic test of the sampler logic.
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type testCase struct {
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rate float64
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maxqps float64
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want int
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}
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const delta = 25 * time.Millisecond
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for _, test := range []testCase{
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// qps won't matter, so we will sample half of the 79 calls
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{0.50, 100, 40},
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// with 1 qps and a burst of 2, we will sample twice in second #1, once in the partial second #2
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{0.50, 1, 3},
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} {
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sp, err := NewLimitedSampler(test.rate, test.maxqps)
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if err != nil {
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t.Fatal(err)
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}
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s := sp.(*sampler)
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sampled := 0
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tm := time.Now()
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for i := 0; i < 80; i++ {
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if ok, _, _ := s.sample(tm, float64(i%2)); ok {
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sampled++
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}
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tm = tm.Add(delta)
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}
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if sampled != test.want {
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t.Errorf("rate=%f, maxqps=%f: got %d samples, want %d", test.rate, test.maxqps, sampled, test.want)
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}
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}
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}
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func TestSampling(t *testing.T) {
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// This scope tests sampling in a larger context, with real time and randomness.
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wg := sync.WaitGroup{}
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type testCase struct {
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rate float64
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maxqps float64
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expectedRange [2]int
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}
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for _, test := range []testCase{
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{0, 5, [2]int{0, 0}},
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{5, 0, [2]int{0, 0}},
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{0.50, 100, [2]int{20, 60}},
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{0.50, 1, [2]int{3, 4}}, // Windows, with its less precise clock, sometimes gives 4.
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} {
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wg.Add(1)
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go func(test testCase) {
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rt := newFakeRoundTripper()
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traceClient := newTestClient(rt)
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p, err := NewLimitedSampler(test.rate, test.maxqps)
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if err != nil {
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t.Fatalf("NewLimitedSampler: %v", err)
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}
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traceClient.SetSamplingPolicy(p)
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ticker := time.NewTicker(25 * time.Millisecond)
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sampled := 0
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for i := 0; i < 79; i++ {
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req, err := http.NewRequest("GET", "http://example.com/foo", nil)
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if err != nil {
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t.Fatal(err)
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}
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span := traceClient.SpanFromRequest(req)
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span.Finish()
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select {
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case <-rt.reqc:
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<-ticker.C
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sampled++
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case <-ticker.C:
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}
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}
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ticker.Stop()
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if test.expectedRange[0] > sampled || sampled > test.expectedRange[1] {
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t.Errorf("rate=%f, maxqps=%f: got %d samples want ∈ %v", test.rate, test.maxqps, sampled, test.expectedRange)
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}
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wg.Done()
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}(test)
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}
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wg.Wait()
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}
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