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Try Getting Time from Server for List Calls #567

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Try Getting Time from Server for List Calls #567

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77015fc
Try getting date from Date header to avoid clock skew
May 15, 2023
08ad049
Add comments back
May 15, 2023
adb4043
Add http response to tests
May 15, 2023
43025c2
Merge branch 'master' into time-from-server
ilkinulas Jul 1, 2023
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16 changes: 13 additions & 3 deletions storage/s3.go
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Expand Up @@ -311,8 +311,8 @@ func (s *S3) listObjectsV2(ctx context.Context, url *url.URL) <-chan *Object {
go func() {
defer close(objCh)
objectFound := false

var now time.Time
var serverDate string

err := s.api.ListObjectsV2PagesWithContext(ctx, &listInput, func(p *s3.ListObjectsV2Output, lastPage bool) bool {
for _, c := range p.CommonPrefixes {
Expand All @@ -330,10 +330,20 @@ func (s *S3) listObjectsV2(ctx context.Context, url *url.URL) <-chan *Object {

objectFound = true
}

// track the instant object iteration began,
// so it can be used to bypass objects created after this instant
if now.IsZero() {
now = time.Now().UTC()
if serverDate != "" {
n, err := http.ParseTime(serverDate)
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http.ParseTime function is not able to accurately represent the last modified time of an S3 object, because the latter has a much higher precision. This is causing the tests to fail.

For example:

  • Parsed time in header : 2023-07-01 19:43:58 +0000 UTC
  • Last Modified time of S3 object: 2023-07-01 19:43:58.058 +0000 UTC

I will let you know if I am able to find a solution to the time comparison issue.

if err != nil {
now = time.Now().UTC()
} else {
now = n
}
} else {
now = time.Now().UTC()
}
}

for _, c := range p.Contents {
Expand Down Expand Up @@ -370,7 +380,7 @@ func (s *S3) listObjectsV2(ctx context.Context, url *url.URL) <-chan *Object {
}

return !lastPage
})
}, request.WithGetResponseHeader("date", &serverDate))

if err != nil {
objCh <- &Object{Err: err}
Expand Down
30 changes: 30 additions & 0 deletions storage/s3_test.go
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Expand Up @@ -227,6 +227,13 @@ func TestS3ListURL(t *testing.T) {
}

mockApi.Handlers.Send.Clear()
mockApi.Handlers.Send.PushBack(func(r *request.Request) {
header := http.Header{}
r.HTTPResponse = &http.Response{
StatusCode: http.StatusOK,
Header: header,
}
})
mockApi.Handlers.Unmarshal.Clear()
mockApi.Handlers.UnmarshalMeta.Clear()
mockApi.Handlers.ValidateResponse.Clear()
Expand Down Expand Up @@ -329,6 +336,13 @@ func TestS3ListNoItemFound(t *testing.T) {
}

mockApi.Handlers.Send.Clear()
mockApi.Handlers.Send.PushBack(func(r *request.Request) {
header := http.Header{}
r.HTTPResponse = &http.Response{
StatusCode: http.StatusOK,
Header: header,
}
})
mockApi.Handlers.Unmarshal.Clear()
mockApi.Handlers.UnmarshalMeta.Clear()
mockApi.Handlers.ValidateResponse.Clear()
Expand Down Expand Up @@ -367,6 +381,14 @@ func TestS3ListContextCancelled(t *testing.T) {
ctx, cancel := context.WithCancel(context.Background())
cancel()

mockApi.Handlers.Complete.Clear()
mockApi.Handlers.Complete.PushBack(func(r *request.Request) {
header := http.Header{}
r.HTTPResponse = &http.Response{
StatusCode: http.StatusOK,
Header: header,
}
})
mockApi.Handlers.Unmarshal.Clear()
mockApi.Handlers.UnmarshalMeta.Clear()
mockApi.Handlers.ValidateResponse.Clear()
Expand Down Expand Up @@ -1164,6 +1186,14 @@ func TestS3ListObjectsAPIVersions(t *testing.T) {
mockS3 := &S3{api: mockApi}

mockApi.Handlers.Send.Clear()
mockApi.Handlers.Send.PushBack(func(r *request.Request) {
header := http.Header{}
header.Set("Date", "Fri, 12 May 2023 20:36:22 GMT")
r.HTTPResponse = &http.Response{
StatusCode: http.StatusOK,
Header: header,
}
})
mockApi.Handlers.Unmarshal.Clear()
mockApi.Handlers.UnmarshalMeta.Clear()
mockApi.Handlers.ValidateResponse.Clear()
Expand Down