126 lines
3.3 KiB
Go
126 lines
3.3 KiB
Go
package main
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import (
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"context"
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"fmt"
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"math"
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"net/http"
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"net/http/httptest"
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"testing"
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"time"
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"github.com/go-logr/logr"
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"github.com/kedacore/http-add-on/pkg/queue"
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"github.com/stretchr/testify/require"
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"golang.org/x/sync/errgroup"
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)
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func TestCountMiddleware(t *testing.T) {
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ctx := context.Background()
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const host = "testingkeda.com"
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r := require.New(t)
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queueCounter := queue.NewFakeCounter()
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middleware := countMiddleware(
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logr.Discard(),
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queueCounter,
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http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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w.WriteHeader(200)
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w.Write([]byte("OK"))
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}),
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)
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// no host in the request
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req, err := http.NewRequest("GET", "/something", nil)
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r.NoError(err)
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agg, respRecorder := expectResizes(
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ctx,
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t,
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0,
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middleware,
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req,
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queueCounter,
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func(t *testing.T, hostAndCount queue.HostAndCount) {},
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)
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r.Equal(400, respRecorder.Code)
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r.Equal("Host not found, not forwarding request", respRecorder.Body.String())
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r.Equal(0, agg)
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// run middleware with the host in the request
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req, err = http.NewRequest("GET", "/something", nil)
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r.NoError(err)
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req.Host = host
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// for a valid request, we expect the queue to be resized twice.
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// once to mark a pending HTTP request, then a second time to remove it.
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// by the end of both sends, resize1 + resize2 should be 0,
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// or in other words, the queue size should be back to zero
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agg, respRecorder = expectResizes(
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ctx,
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t,
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2,
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middleware,
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req,
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queueCounter,
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func(t *testing.T, hostAndCount queue.HostAndCount) {
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t.Helper()
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r := require.New(t)
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r.Equal(float64(1), math.Abs(float64(hostAndCount.Count)))
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r.Equal(host, hostAndCount.Host)
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},
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)
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r.Equal(200, respRecorder.Code)
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r.Equal("OK", respRecorder.Body.String())
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r.Equal(0, agg)
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}
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// expectResizes creates a new httptest.ResponseRecorder, then passes req through
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// the middleware. every time the middleware calls fakeCounter.Resize(), it calls
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// resizeCheckFn with t and the queue.HostCount that represents the resize call
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// that was made. it also maintains an aggregate delta of the counts passed to
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// Resize. If, for example, the following integers were passed to resize over
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// 4 calls: [-1, 1, 1, 2], the aggregate would be -1+1+1+2=3
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//
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// this function returns the aggregate and the httptest.ResponseRecorder that was
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// created and used with the middleware
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func expectResizes(
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ctx context.Context,
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t *testing.T,
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nResizes int,
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middleware http.Handler,
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req *http.Request,
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fakeCounter *queue.FakeCounter,
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resizeCheckFn func(*testing.T, queue.HostAndCount),
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) (int, *httptest.ResponseRecorder) {
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t.Helper()
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r := require.New(t)
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const timeout = 1 * time.Second
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ctx, cancel := context.WithTimeout(ctx, 1*time.Second)
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defer cancel()
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grp, ctx := errgroup.WithContext(ctx)
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agg := 0
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grp.Go(func() error {
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// we expect the queue to be resized nResizes times
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for i := 0; i < nResizes; i++ {
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select {
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case hostAndCount := <-fakeCounter.ResizedCh:
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agg += hostAndCount.Count
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resizeCheckFn(t, hostAndCount)
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case <-ctx.Done():
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return fmt.Errorf(
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"timed out waiting for the count middleware. expected %d resizes, timeout was %s, iteration %d",
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nResizes,
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timeout,
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i,
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)
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}
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}
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return nil
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})
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respRecorder := httptest.NewRecorder()
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middleware.ServeHTTP(respRecorder, req)
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r.NoError(grp.Wait())
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return agg, respRecorder
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}
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