package cache
import (
"errors"
"io"
"testing"
"time"
"github.com/go-kit/kit/endpoint"
"github.com/go-kit/kit/log"
)
func TestCache(t *testing.T) {
var (
ca = make(closer)
cb = make(closer)
c = map[string]io.Closer{"a": ca, "b": cb}
f = func(instance string) (endpoint.Endpoint, io.Closer, error) { return endpoint.Nop, c[instance], nil }
cache = New(f, log.NewNopLogger())
)
// Populate
cache.Update([]string{"a", "b"})
select {
case <-ca:
t.Errorf("endpoint a closed, not good")
case <-cb:
t.Errorf("endpoint b closed, not good")
case <-time.After(time.Millisecond):
t.Logf("no closures yet, good")
}
if want, have := 2, len(cache.Endpoints()); want != have {
t.Errorf("want %d, have %d", want, have)
}
// Duplicate, should be no-op
cache.Update([]string{"a", "b"})
select {
case <-ca:
t.Errorf("endpoint a closed, not good")
case <-cb:
t.Errorf("endpoint b closed, not good")
case <-time.After(time.Millisecond):
t.Logf("no closures yet, good")
}
if want, have := 2, len(cache.Endpoints()); want != have {
t.Errorf("want %d, have %d", want, have)
}
// Delete b
go cache.Update([]string{"a"})
select {
case <-ca:
t.Errorf("endpoint a closed, not good")
case <-cb:
t.Logf("endpoint b closed, good")
case <-time.After(time.Second):
t.Errorf("didn't close the deleted instance in time")
}
if want, have := 1, len(cache.Endpoints()); want != have {
t.Errorf("want %d, have %d", want, have)
}
// Delete a
go cache.Update([]string{})
select {
// case <-cb: will succeed, as it's closed
case <-ca:
t.Logf("endpoint a closed, good")
case <-time.After(time.Second):
t.Errorf("didn't close the deleted instance in time")
}
if want, have := 0, len(cache.Endpoints()); want != have {
t.Errorf("want %d, have %d", want, have)
}
}
func TestBadFactory(t *testing.T) {
cache := New(func(string) (endpoint.Endpoint, io.Closer, error) {
return nil, nil, errors.New("bad factory")
}, log.NewNopLogger())
cache.Update([]string{"foo:1234", "bar:5678"})
if want, have := 0, len(cache.Endpoints()); want != have {
t.Errorf("want %d, have %d", want, have)
}
}
type closer chan struct{}
func (c closer) Close() error { close(c); return nil }