The toolkit to pack, ship, store, and deliver container content
bf2cc0a9d6
Without this commit, three round-trips are required to fetch a blob with a progress bar. The first is a call to Stat (HEAD request), to determine the size. Then Open is called, which also calls Stat, and finally performs a GET request. Only the GET request is actually needed. The size of the blob can be sniffed from Content-Length in the GET response. This commit changes HTTPReadSeeker to automatically detect the size from Content-Length instead of requiring it to be passed in. The Stat call is removed from Open because it is no longer necessary. HTTPReadSeeker now takes an additional errorHandler callback argument which translates an unsuccessful HTTP response into an appropriate API-level error. Using a callback for this makes it possible to avoid leaking the repsonse body to Read's caller, which would make lifecycle management problematic. Fixes #1223 Signed-off-by: Aaron Lehmann <aaron.lehmann@docker.com> |
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