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http: Handle missing but unambiguous ETags in response #1159

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merged 2 commits into from
Sep 5, 2019
Merged

http: Handle missing but unambiguous ETags in response #1159

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c63c6f9
http: Handle missing but unambiguous ETags in response
rwe Sep 4, 2019
6ff0868
http: Response refers to requested ETag on 304, not 200
rwe Sep 5, 2019
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19 changes: 19 additions & 0 deletions source/http/httpsource.go
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Original file line number Diff line number Diff line change
Expand Up @@ -144,6 +144,11 @@ func (hs *httpSourceHandler) CacheKey(ctx context.Context, index int) (string, b
req = req.WithContext(ctx)
m := map[string]*metadata.StorageItem{}

// If we request a single ETag in 'If-None-Match', some servers omit the
// unambiguous ETag in their response.
// See: https://github.com/moby/buildkit/issues/905
var onlyETag string

if len(sis) > 0 {
for _, si := range sis {
// if metaDigest := getMetaDigest(si); metaDigest == hs.formatCacheKey("") {
Expand All @@ -160,6 +165,10 @@ func (hs *httpSourceHandler) CacheKey(ctx context.Context, index int) (string, b
etags = append(etags, t)
}
req.Header.Add("If-None-Match", strings.Join(etags, ", "))

if len(etags) == 1 {
onlyETag = etags[0]
}
}
}

Expand All @@ -172,6 +181,9 @@ func (hs *httpSourceHandler) CacheKey(ctx context.Context, index int) (string, b
if err == nil {
if resp.StatusCode == http.StatusOK || resp.StatusCode == http.StatusNotModified {
respETag := resp.Header.Get("ETag")
if respETag == "" && onlyETag != "" {
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respETag = onlyETag
}
si, ok := m[respETag]
if ok {
hs.refID = si.ID()
Expand All @@ -197,6 +209,13 @@ func (hs *httpSourceHandler) CacheKey(ctx context.Context, index int) (string, b
}
if resp.StatusCode == http.StatusNotModified {
respETag := resp.Header.Get("ETag")
if respETag == "" && onlyETag != "" {
respETag = onlyETag

// Set the missing ETag header on the response so that it's available
// to .save()
resp.Header.Set("ETag", onlyETag)
}
si, ok := m[respETag]
if !ok {
return "", false, errors.Errorf("invalid not-modified ETag: %v", respETag)
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