79 lines
2.2 KiB
Go
79 lines
2.2 KiB
Go
package queueing
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import (
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"fmt"
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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/prometheus/client_golang/prometheus"
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)
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var httpHandler = http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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fmt.Fprintln(w, "OK")
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})
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func pausedHttpHandler(pauseCh chan struct{}) http.Handler {
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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<-pauseCh
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fmt.Fprintln(w, "OK")
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})
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}
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func TestNormalRequestProcessing(t *testing.T) {
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w := httptest.NewRecorder()
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h := QueueRequests("Normal request processing", httpHandler, 1, 1, time.Second, prometheus.NewRegistry())
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h.ServeHTTP(w, nil)
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if w.Code != 200 {
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t.Fatal("QueueRequests should process request")
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}
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}
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// testSlowRequestProcessing creates a new queue,
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// then it runs a number of requests that are going through queue,
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// we return the response of first finished request,
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// where status of request can be 200, 429 or 503
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func testSlowRequestProcessing(name string, count int, limit, queueLimit uint, queueTimeout time.Duration) *httptest.ResponseRecorder {
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pauseCh := make(chan struct{})
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defer close(pauseCh)
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handler := QueueRequests("Slow request processing: "+name, pausedHttpHandler(pauseCh), limit, queueLimit, queueTimeout, prometheus.NewRegistry())
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respCh := make(chan *httptest.ResponseRecorder, count)
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// queue requests to use up the queue
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for i := 0; i < count; i++ {
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go func() {
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w := httptest.NewRecorder()
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handler.ServeHTTP(w, nil)
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respCh <- w
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}()
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}
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// dequeue first request
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return <-respCh
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}
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// TestQueueingTimeout performs 2 requests
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// the queue limit and length is 1,
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// the second request gets timed-out
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func TestQueueingTimeout(t *testing.T) {
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w := testSlowRequestProcessing("timeout", 2, 1, 1, time.Microsecond)
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if w.Code != 503 {
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t.Fatal("QueueRequests should timeout queued request")
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}
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}
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// TestQueueingTooManyRequests performs 3 requests
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// the queue limit and length is 1,
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// so the third request has to be rejected with 429
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func TestQueueingTooManyRequests(t *testing.T) {
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w := testSlowRequestProcessing("too many requests", 3, 1, 1, time.Minute)
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if w.Code != 429 {
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t.Fatal("QueueRequests should return immediately and return too many requests")
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}
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}
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