func (s *Disk) getObjectIDPath(id *types.ObjectID) string {
// !TODO redo this with more []byte appending(we know how big it will be)
// less string concatination
h := id.StrHash()
// Disk objects are writen 2 levels deep with maximum of 256 folders in each
if s.skipCacheKeyInPath {
return filepath.Join(s.path, h[0:2], h[2:4], h)
}
return filepath.Join(s.path, id.CacheKey(), h[0:2], h[2:4], h)
}
// Tests the storage headers map in multithreading usage. An error will be
// triggered by a race condition. This may or may not happen. So no failures
// in the test do not mean there are no problems. But it may catch an error
// from time to time. In fact it does quite often for me.
//
// Most of the time the test fails with a panic. And most of the time
// the panic is in the runtime. So isntead of a error message via t.Error
// the test fails with a panic.
func TestStorageHeadersFunctionWithManyGoroutines(t *testing.T) {
up, cz, ca, goroutines := setup()
pathFunc := func(i int) string {
return fmt.Sprintf("/%d", i)
}
headerKeyFunc := func(i int) string {
return fmt.Sprintf("X-Header-%d", i)
}
headerValueFunc := func(i int) string {
return fmt.Sprintf("value-%d", i)
}
// setup the response
for i := 0; i < 100; i++ {
var headers = make(http.Header)
headers.Add(headerKeyFunc(i), headerValueFunc(i))
up.addFakeResponse(pathFunc(i),
fakeResponse{
Status: "200",
ResponseTime: 10 * time.Nanosecond,
Headers: headers,
},
)
}
storage := New(cz, ca, newStdLogger())
defer storage.Close()
defer os.RemoveAll(storage.path)
ctx := contexts.NewVhostContext(context.Background(), &types.VirtualHost{Upstream: up})
concurrentTestHelper(t, goroutines, 100, func(t *testing.T, i, j int) {
oid := types.ObjectID{}
oid.CacheKey = "1"
oid.Path = pathFunc(i)
header, err := storage.Headers(ctx, oid)
if err != nil {
t.Errorf("Got error from storage.Headers on %d, %d: %s", j, i, err)
}
value := header.Get(headerKeyFunc(i))
if value != headerValueFunc(i) {
t.Errorf("Expected header [%s] to have value [%s] but it had value %s for %d, %d", headerKeyFunc(i), headerValueFunc(i), value, j, i)
}
})
}
func TestDiskCloseReturnesAfterFinishingRequests(t *testing.T) {
expected := "awesome"
fakeup, cz, ca, _ := setup()
runtime.GOMAXPROCS(runtime.NumCPU())
up := newBlockingUpstream(fakeup)
up.addFakeResponse("/path",
fakeResponse{
Status: "200",
ResponseTime: 0,
Response: expected,
})
storage := New(cz, ca, newStdLogger())
defer os.RemoveAll(storage.path)
ctx := contexts.NewVhostContext(context.Background(), &types.VirtualHost{Upstream: up})
wCh := make(chan struct{})
go func(ch chan struct{}) {
defer close(ch)
oid := types.ObjectID{}
oid.CacheKey = "1"
oid.Path = "/path"
resp, err := storage.GetFullFile(ctx, oid)
if err != nil {
t.Errorf("Got Error on a GetFullFile on closing storage:\n%s", err)
}
b, err := ioutil.ReadAll(resp)
if err != nil {
t.Errorf("Got Error on a ReadAll on an already closed storage:\n%s", err)
}
if string(b) != expected {
t.Errorf("Expected read from GetFullFile was %s but got %s", expected, string(b))
}
}(wCh)
go close(<-up.requestPartial)
err := storage.Close()
if err != nil {
t.Errorf("Storage.Close() shouldn't have returned error\n%s", err)
}
<-wCh
}
func TestStorageSimultaneousGets(t *testing.T) {
fakeup, cz, ca, goroutines := setup()
runtime.GOMAXPROCS(runtime.NumCPU())
up := &countingUpstream{
fakeUpstream: fakeup,
}
up.addFakeResponse("/path",
fakeResponse{
Status: "200",
ResponseTime: 10 * time.Millisecond,
Response: "awesome",
})
storage := New(cz, ca, newStdLogger())
defer storage.Close()
defer os.RemoveAll(storage.path)
ctx := contexts.NewVhostContext(context.Background(), &types.VirtualHost{Upstream: up})
concurrentTestHelper(t, goroutines, 1, func(t *testing.T, i, j int) {
oid := types.ObjectID{}
oid.CacheKey = "1"
oid.Path = "/path"
file, err := storage.GetFullFile(ctx, oid)
if err != nil {
t.Errorf("Got error from storage.Get on %d, %d: %s", j, i, err)
}
b, err := ioutil.ReadAll(file)
if err != nil {
t.Errorf("Got error while reading response on %d, %d: %s", j, i, err)
}
if string(b) != "awesome" {
t.Errorf("The response was expected to be 'awesome' but it was %s", string(b))
}
})
if up.called != 1 {
t.Errorf("Expected upstream.GetRequest to be called once it got called %d", up.called)
}
}
func TestDiskCloseReturnesAfterFinishingHeaders(t *testing.T) {
var expected = make(http.Header)
var expectedHeader, expectedValue = "awesome-header", "awesome-value"
expected.Add(expectedHeader, expectedValue)
fakeup, cz, ca, _ := setup()
runtime.GOMAXPROCS(runtime.NumCPU())
up := newBlockingUpstream(fakeup)
up.addFakeResponse("/path",
fakeResponse{
Status: "200",
ResponseTime: 0,
Headers: expected,
})
storage := New(cz, ca, newStdLogger())
defer os.RemoveAll(storage.path)
ctx := contexts.NewVhostContext(context.Background(), &types.VirtualHost{Upstream: up})
wCh := make(chan struct{})
go func(ch chan struct{}) {
defer close(ch)
oid := types.ObjectID{}
oid.CacheKey = "1"
oid.Path = "/path"
headers, err := storage.Headers(ctx, oid)
if err != nil {
t.Errorf("Got Error on a Headers on closing storage:\n%s", err)
}
if headers.Get(expectedHeader) != expectedValue { //!TODO: better check
t.Errorf("The returned headers:\n%s\n Did not match the expected headers\n%s", headers, expected)
}
}(wCh)
go close(<-up.requestHeader)
err := storage.Close()
if err != nil {
t.Errorf("Storage.Close() shouldn't have returned error\n%s", err)
}
<-wCh
}
func (s *Disk) getObjectIDPath(id *types.ObjectID) string {
h := id.StrHash()
// Disk objects are writen 2 levels deep with maximum of 256 folders in each
return filepath.Join(s.path, id.CacheKey(), h[0:2], h[2:4], h)
}