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Merge pull request #518 from RichardScothern/cache-headers
Set cache headers for layers.
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commit
aeda6f5f8f
2 changed files with 62 additions and 0 deletions
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@ -263,6 +263,43 @@ func TestLayerAPI(t *testing.T) {
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checkResponse(t, "fetching layer bad digest", resp, http.StatusBadRequest)
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// Cache headers
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resp, err = http.Get(layerURL)
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if err != nil {
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t.Fatalf("unexpected error fetching layer: %v", err)
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}
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checkResponse(t, "fetching layer", resp, http.StatusOK)
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checkHeaders(t, resp, http.Header{
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"Content-Length": []string{fmt.Sprint(layerLength)},
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"Docker-Content-Digest": []string{layerDigest.String()},
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"ETag": []string{layerDigest.String()},
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"Cache-Control": []string{"max-age=86400"},
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})
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// Matching etag, gives 304
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etag := resp.Header.Get("Etag")
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req, err = http.NewRequest("GET", layerURL, nil)
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if err != nil {
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t.Fatalf("Error constructing request: %s", err)
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}
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req.Header.Set("If-None-Match", etag)
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resp, err = http.DefaultClient.Do(req)
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if err != nil {
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t.Fatalf("Error constructing request: %s", err)
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}
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checkResponse(t, "fetching layer with etag", resp, http.StatusNotModified)
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// Non-matching etag, gives 200
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req, err = http.NewRequest("GET", layerURL, nil)
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if err != nil {
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t.Fatalf("Error constructing request: %s", err)
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}
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req.Header.Set("If-None-Match", "")
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resp, err = http.DefaultClient.Do(req)
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checkResponse(t, "fetching layer with invalid etag", resp, http.StatusOK)
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// Missing tests:
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// - Upload the same tarsum file under and different repository and
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// ensure the content remains uncorrupted.
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@ -1,6 +1,7 @@
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package storage
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import (
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"fmt"
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"net/http"
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"time"
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@ -73,7 +74,31 @@ func (lr *layerReader) Handler(r *http.Request) (h http.Handler, err error) {
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}
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return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
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// If the registry is serving this content itself, check
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// the If-None-Match header and return 304 on match. Redirected
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// storage implementations do the same.
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if etagMatch(r, lr.digest.String()) {
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w.WriteHeader(http.StatusNotModified)
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return
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}
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setCacheHeaders(w, 86400, lr.digest.String())
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w.Header().Set("Docker-Content-Digest", lr.digest.String())
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handlerFunc.ServeHTTP(w, r)
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}), nil
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}
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func etagMatch(r *http.Request, etag string) bool {
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for _, headerVal := range r.Header["If-None-Match"] {
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if headerVal == etag {
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return true
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}
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}
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return false
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}
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func setCacheHeaders(w http.ResponseWriter, cacheAge int, etag string) {
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w.Header().Set("ETag", etag)
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w.Header().Set("Cache-Control", fmt.Sprintf("max-age=%d", cacheAge))
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}
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