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rgw: implement RGWStreamIOConLenControllingEngine.

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Signed-off-by: Radoslaw Zarzynski <rzarzynski@mirantis.com>
This commit is contained in:
Radoslaw Zarzynski 2016-08-01 17:43:01 +02:00
parent 98907b187b
commit c1780267ff
1 changed files with 46 additions and 2 deletions
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48
src/rgw/rgw_client_io_decoimpl.h
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@ -247,9 +247,53 @@ int RGWStreamIOBufferingEngine<T>::complete_request()
return sent + RGWDecoratedStreamIO<T>::complete_request();
}
/* Class that controls and inhibits the process of sending Content-Length HTTP
* header where RFC 7230 requests so. The cases worth our attention are 204 No
* Content as well as 304 Not Modified. */
template <typename T>
RGWStreamIOBufferingEngine<T> add_buffering(T&& t) {
return RGWStreamIOBufferingEngine<T>(std::move(t));
class RGWStreamIOConLenControllingEngine : public RGWDecoratedStreamIO<T> {
protected:
enum class ContentLengthAction {
FORWARD,
INHIBIT,
UNKNOWN
} action;
public:
template <typename U>
RGWStreamIOConLenControllingEngine(U&& decoratee)
: RGWDecoratedStreamIO<T>(std::move(decoratee)),
action(ContentLengthAction::UNKNOWN) {
}
int send_status(const int status, const char* const status_name) override {
if (204 == status || 304 == status) {
action = ContentLengthAction::INHIBIT;
} else {
action = ContentLengthAction::FORWARD;
}
return RGWDecoratedStreamIO<T>::send_status(status, status_name);
}
int send_content_length(const uint64_t len) override {
switch(action) {
case ContentLengthAction::FORWARD:
return RGWDecoratedStreamIO<T>::send_content_length(len);
case ContentLengthAction::INHIBIT:
return 0;
case ContentLengthAction::UNKNOWN:
default:
return -EINVAL;
}
}
};
template <typename T>
RGWStreamIOConLenControllingEngine<T> add_conlen_controlling(T&& t) {
return RGWStreamIOConLenControllingEngine<T>(std::move(t));
}