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package httprc_test
import (
"context"
"fmt"
"net/http"
"net/http/httptest"
"sync"
"testing"
"time"
"github.com/lestrrat-go/httprc"
"github.com/stretchr/testify/assert"
)
type dummyErrSink struct {
mu sync.RWMutex
errors []error
}
func (d *dummyErrSink) Error(err error) {
d.mu.Lock()
defer d.mu.Unlock()
d.errors = append(d.errors, err)
}
func (d *dummyErrSink) getErrors() []error {
d.mu.RLock()
defer d.mu.RUnlock()
return d.errors
}
func TestCache(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
defer cancel()
var muCalled sync.Mutex
var called int
srv := httptest.NewTLSServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
select {
case <-ctx.Done():
return
default:
}
muCalled.Lock()
called++
muCalled.Unlock()
w.Header().Set(`Cache-Control`, fmt.Sprintf(`max-age=%d`, 3))
w.WriteHeader(http.StatusOK)
}))
errSink := &dummyErrSink{}
c := httprc.NewCache(ctx,
httprc.WithRefreshWindow(time.Second),
httprc.WithErrSink(errSink),
)
c.Register(srv.URL, httprc.WithHTTPClient(srv.Client()), httprc.WithMinRefreshInterval(time.Second))
if !assert.True(t, c.IsRegistered(srv.URL)) {
return
}
for i := 0; i < 3; i++ {
v, err := c.Get(ctx, srv.URL)
if !assert.NoError(t, err, `c.Get should succeed`) {
return
}
if !assert.IsType(t, []byte(nil), v, `c.Get should return []byte`) {
return
}
}
muCalled.Lock()
if !assert.Equal(t, 1, called, `there should only be one fetch request`) {
return
}
muCalled.Unlock()
time.Sleep(4 * time.Second)
for i := 0; i < 3; i++ {
_, err := c.Get(ctx, srv.URL)
if !assert.NoError(t, err, `c.Get should succeed`) {
return
}
}
muCalled.Lock()
if !assert.Equal(t, 2, called, `there should only be one fetch request`) {
return
}
muCalled.Unlock()
if !assert.True(t, len(errSink.errors) == 0) {
return
}
c.Register(srv.URL,
httprc.WithHTTPClient(srv.Client()),
httprc.WithMinRefreshInterval(time.Second),
httprc.WithTransformer(httprc.TransformFunc(func(_ string, _ *http.Response) (interface{}, error) {
return nil, fmt.Errorf(`dummy error`)
})),
)
_, _ = c.Get(ctx, srv.URL)
time.Sleep(3 * time.Second)
cancel()
if !assert.True(t, len(errSink.getErrors()) > 0) {
return
}
}
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