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