179 lines
5.7 KiB
C++
179 lines
5.7 KiB
C++
/*
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* Spdylay - SPDY Library
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*
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* Copyright (c) 2012 Tatsuhiro Tsujikawa
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*
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* Permission is hereby granted, free of charge, to any person obtaining
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* a copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sublicense, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be
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* included in all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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*/
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#include "shrpx_downstream_connection.h"
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#include "shrpx_client_handler.h"
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#include "shrpx_upstream.h"
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#include "shrpx_downstream.h"
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#include "shrpx_config.h"
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#include "shrpx_error.h"
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namespace shrpx {
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DownstreamConnection::DownstreamConnection(ClientHandler *client_handler)
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: client_handler_(client_handler),
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bev_(0),
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downstream_(0)
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{
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}
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DownstreamConnection::~DownstreamConnection()
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{
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if(bev_) {
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bufferevent_disable(bev_, EV_READ | EV_WRITE);
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bufferevent_free(bev_);
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}
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// Downstream and DownstreamConnection may be deleted
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// asynchronously.
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if(downstream_) {
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downstream_->set_downstream_connection(0);
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}
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}
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int DownstreamConnection::attach_downstream(Downstream *downstream)
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{
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if(ENABLE_LOG) {
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LOG(INFO) << "Attaching downstream connection " << this << " to "
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<< "downstream " << downstream;
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}
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Upstream *upstream = downstream->get_upstream();
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if(!bev_) {
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event_base *evbase = client_handler_->get_evbase();
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bev_ = bufferevent_socket_new
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(evbase, -1,
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BEV_OPT_CLOSE_ON_FREE | BEV_OPT_DEFER_CALLBACKS);
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int rv = bufferevent_socket_connect
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(bev_,
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// TODO maybe not thread-safe?
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const_cast<sockaddr*>(&get_config()->downstream_addr.sa),
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get_config()->downstream_addrlen);
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if(rv != 0) {
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bufferevent_free(bev_);
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bev_ = 0;
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return SHRPX_ERR_NETWORK;
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}
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if(ENABLE_LOG) {
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LOG(INFO) << "Connecting to downstream server " << this;
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}
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}
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downstream->set_downstream_connection(this);
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downstream_ = downstream;
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bufferevent_setwatermark(bev_, EV_READ, 0, SHRPX_READ_WARTER_MARK);
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bufferevent_enable(bev_, EV_READ);
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bufferevent_setcb(bev_,
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upstream->get_downstream_readcb(),
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upstream->get_downstream_writecb(),
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upstream->get_downstream_eventcb(), this);
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// HTTP request/response model, we first issue request to downstream
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// server, so just enable write timeout here.
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bufferevent_set_timeouts(bev_,
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0,
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&get_config()->downstream_write_timeout);
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return 0;
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}
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// When downstream request is issued, call this function to set read
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// timeout. We don't know when the request is completely received by
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// the downstream server. This function may be called before that
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// happens. Overall it does not cause problem for most of the time.
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// If the downstream server is too slow to recv/send, the connection
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// will be dropped by read timeout.
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void DownstreamConnection::start_waiting_response()
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{
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if(bev_) {
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bufferevent_set_timeouts(bev_,
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&get_config()->downstream_read_timeout,
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0);
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}
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}
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namespace {
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// Gets called when DownstreamConnection is pooled in ClientHandler.
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void idle_eventcb(bufferevent *bev, short events, void *arg)
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{
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DownstreamConnection *dconn = reinterpret_cast<DownstreamConnection*>(arg);
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if(events & BEV_EVENT_CONNECTED) {
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// Downstream was detached before connection established?
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// This may be safe to be left.
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if(ENABLE_LOG) {
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LOG(INFO) << "Idle downstream connected?" << dconn;
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}
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return;
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}
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if(events & BEV_EVENT_EOF) {
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if(ENABLE_LOG) {
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LOG(INFO) << "Idle downstream connection EOF " << dconn;
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}
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} else if(events & BEV_EVENT_TIMEOUT) {
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if(ENABLE_LOG) {
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LOG(INFO) << "Idle downstream connection timeout " << dconn;
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}
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} else if(events & BEV_EVENT_ERROR) {
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if(ENABLE_LOG) {
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LOG(INFO) << "Idle downstream connection error " << dconn;
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}
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}
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ClientHandler *client_handler = dconn->get_client_handler();
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client_handler->remove_downstream_connection(dconn);
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delete dconn;
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}
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} // namespace
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void DownstreamConnection::detach_downstream(Downstream *downstream)
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{
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if(ENABLE_LOG) {
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LOG(INFO) << "Detaching downstream connection " << this << " from "
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<< "downstream " << downstream;
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}
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downstream->set_downstream_connection(0);
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downstream_ = 0;
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bufferevent_enable(bev_, EV_READ);
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bufferevent_setcb(bev_, 0, 0, idle_eventcb, this);
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// On idle state, just enable read timeout. Normally idle downstream
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// connection will get EOF from the downstream server and closed.
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bufferevent_set_timeouts(bev_,
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&get_config()->downstream_idle_read_timeout,
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0);
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client_handler_->pool_downstream_connection(this);
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}
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ClientHandler* DownstreamConnection::get_client_handler()
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{
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return client_handler_;
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}
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Downstream* DownstreamConnection::get_downstream()
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{
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return downstream_;
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}
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bufferevent* DownstreamConnection::get_bev()
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{
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return bev_;
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}
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} // namespace shrpx
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