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XL: GetObject caching implemented for XL. (#2017)

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The object cache implementation is XL cache, which defaults
to 8GB worth of read cache. Currently GetObject() transparently
writes to this cache upon first client read and then subsequently
serves reads from the same cache.

Currently expiration is not implemented.
This commit is contained in:
Harshavardhana
2016-07-03 16:58:21 -07:00
parent 8d4365d23c
commit d2557bb538
12 changed files with 730 additions and 37 deletions
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object-handlers.go
+7 -5
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@@ -115,6 +115,7 @@ func (api objectAPIHandlers) GetObjectHandler(w http.ResponseWriter, r *http.Req
return
}
// Caculate the http Range.
var hrange *httpRange
hrange, err = getRequestedRange(r.Header.Get("Range"), objInfo.Size)
if err != nil {
@@ -144,22 +145,23 @@ func (api objectAPIHandlers) GetObjectHandler(w http.ResponseWriter, r *http.Req
if length == 0 {
length = objInfo.Size - startOffset
}
// Reads the object at startOffset and writes to mw.
if err := api.ObjectAPI.GetObject(bucket, object, startOffset, length, w); err != nil {
errorIf(err, "Writing to client failed.")
errorIf(err, "Unable to write to client.")
// Do not send error response here, client would have already died.
return
}
// Success.
}
var unixEpochTime = time.Unix(0, 0)
// checkLastModified implements If-Modified-Since and
// If-Unmodified-Since checks.
//
// modtime is the modification time of the resource to be served, or
// IsZero(). return value is whether this request is now complete.
func checkLastModified(w http.ResponseWriter, r *http.Request, modtime time.Time) bool {
if modtime.IsZero() || modtime.Equal(unixEpochTime) {
if modtime.IsZero() || modtime.Equal(time.Unix(0, 0)) {
// If the object doesn't have a modtime (IsZero), or the modtime
// is obviously garbage (Unix time == 0), then ignore modtimes
// and don't process the If-Modified-Since header.
@@ -452,7 +454,7 @@ func (api objectAPIHandlers) CopyObjectHandler(w http.ResponseWriter, r *http.Re
// modtime is the modification time of the resource to be served, or
// IsZero(). return value is whether this request is now complete.
func checkCopySourceLastModified(w http.ResponseWriter, r *http.Request, modtime time.Time) bool {
if modtime.IsZero() || modtime.Equal(unixEpochTime) {
if modtime.IsZero() || modtime.Equal(time.Unix(0, 0)) {
// If the object doesn't have a modtime (IsZero), or the modtime
// is obviously garbage (Unix time == 0), then ignore modtimes
// and don't process the If-Modified-Since header.