shinrich commented on a change in pull request #7622:
URL: https://github.com/apache/trafficserver/pull/7622#discussion_r647040474
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File path: proxy/http/HttpSM.cc
##########
@@ -289,6 +277,160 @@ HttpVCTable::cleanup_all()
}
}
+class ConnectingEntry : public Continuation
+{
+public:
+ std::set<HttpSM *> _connect_sms;
+ NetVConnection *_netvc = nullptr;
+ IOBufferReader *_netvc_reader = nullptr;
+ MIOBuffer *_netvc_read_buffer = nullptr;
+ std::string sni;
+ std::string cert_name;
+ IpEndpoint _ipaddr;
+ std::string hostname;
+ Action *_pending_action = nullptr;
+ NetVCOptions opt;
+
+ void remove_entry();
+ int state_http_server_open(int event, void *data);
+ static PoolableSession *create_server_session(HttpSM *root_sm,
NetVConnection *netvc, MIOBuffer *netvc_read_buffer,
+ IOBufferReader *netvc_reader);
+};
+
+struct IpHelper {
+ size_t
+ operator()(IpEndpoint const &arg) const
+ {
+ return IpAddr{&arg.sa}.hash();
+ }
+ bool
+ operator()(IpEndpoint const &arg1, IpEndpoint const &arg2) const
+ {
+ return ats_ip_addr_port_eq(&arg1.sa, &arg2.sa);
+ }
+};
+using ConnectingIpPool = std::unordered_multimap<IpEndpoint, ConnectingEntry
*, IpHelper>;
+
+class ConnectingPool
+{
+public:
+ ConnectingPool() {}
+ ConnectingIpPool m_ip_pool;
+};
+
+void
+initialize_thread_for_connecting_pools(EThread *thread)
+{
+ if (thread->connecting_pool == nullptr) {
+ thread->connecting_pool = new ConnectingPool();
+ }
+}
+
+int
+ConnectingEntry::state_http_server_open(int event, void *data)
+{
+ Debug("http_connect", "entered inside
ConnectingEntry::state_http_server_open");
+
+ switch (event) {
+ case NET_EVENT_OPEN: {
+ _netvc = static_cast<NetVConnection *>(data);
+ UnixNetVConnection *vc = static_cast<UnixNetVConnection *>(_netvc);
+ ink_release_assert(_pending_action == nullptr ||
_pending_action->continuation == vc->get_action()->continuation);
+ _pending_action = nullptr;
+ Debug("http_connect", "ConnectingEntrysetting handler for TCP handshake");
+ // Just want to get a write-ready event so we know that the TCP handshake
is complete.
+ // The buffer we create will be handed over to the eventually created
server session
+ _netvc_read_buffer = new_MIOBuffer(HTTP_SERVER_RESP_HDR_BUFFER_INDEX);
+ _netvc_reader = _netvc_read_buffer->alloc_reader();
+ _netvc->do_io_write(this, 1, _netvc_reader);
+ ink_release_assert(!_connect_sms.empty());
+ if (!_connect_sms.empty()) {
+ HttpSM *prime_connect_sm = *(_connect_sms.begin());
+
_netvc->set_inactivity_timeout(prime_connect_sm->get_server_connect_timeout());
+ }
+ ink_release_assert(_pending_action == nullptr);
+ return 0;
+ }
+ case VC_EVENT_READ_COMPLETE:
+ case VC_EVENT_WRITE_READY:
+ case VC_EVENT_WRITE_COMPLETE: {
+ Debug("http_connect", "Kick off %" PRId64 " state machines waiting for
origin", _connect_sms.size());
+ this->remove_entry();
+ _netvc->do_io_write(nullptr, 0, nullptr);
+ if (!_connect_sms.empty()) {
+ auto prime_iter = _connect_sms.rbegin();
+ ink_release_assert(prime_iter != _connect_sms.rend());
+ PoolableSession *new_session =
(*prime_iter)->create_server_session(_netvc, _netvc_read_buffer, _netvc_reader);
+ _netvc = nullptr;
+
+ // Did we end up with a multiplexing session?
+ int count = 0;
+ if (new_session->is_multiplexing()) {
+ // Hand off to all queued up ConnectSM's.
Review comment:
You don't know. There is logic before requests are queued that tried to
determine if the origin connection may be close to its limit of simultaneous
active transactions (In the H2 case using a function of the current setting for
max_concurrent_streams)
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