HTTP Client improvements
- max connections limit, and parallel connections to a single host where possible. (Will permit updating terrain and Models / Airports / data in parallel) - add LGPL headers - give HTTP::Client a private impl class, to keep header simple.
This commit is contained in:
James Turner
parent
362d47f91f
commit
9c7bd4f5d5
@ -1,3 +1,26 @@
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/**
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* \file HTTPClient.cxx - simple HTTP client engine for SimHear
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*/
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// Written by James Turner
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//
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// Copyright (C) 2013 James Turner <zakalawe@mac.com>
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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#include "HTTPClient.hxx"
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#include <sstream>
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@ -5,6 +28,7 @@
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#include <list>
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#include <iostream>
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#include <errno.h>
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#include <map>
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#include <boost/foreach.hpp>
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#include <boost/algorithm/string/case_conv.hpp>
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@ -17,6 +41,7 @@
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#include <simgear/compiler.h>
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#include <simgear/debug/logstream.hxx>
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#include <simgear/timing/timestamp.hxx>
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#include <simgear/structure/exception.hxx>
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#if defined( HAVE_VERSION_H ) && HAVE_VERSION_H
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#include "version.h"
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@ -53,8 +78,26 @@ const int GZIP_HEADER_FNAME = 1 << 3;
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const int GZIP_HEADER_COMMENT = 1 << 4;
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const int GZIP_HEADER_CRC = 1 << 1;
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class Connection;
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typedef std::multimap<std::string, Connection*> ConnectionDict;
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typedef std::list<Request_ptr> RequestList;
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class Client::ClientPrivate
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{
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public:
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std::string userAgent;
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std::string proxy;
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int proxyPort;
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std::string proxyAuth;
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NetChannelPoller poller;
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unsigned int maxConnections;
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RequestList pendingRequests;
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// connections by host (potentially more than one)
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ConnectionDict connections;
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};
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class Connection : public NetChat
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{
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public:
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@ -690,56 +733,128 @@ private:
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RequestList sentRequests;
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};
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Client::Client()
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Client::Client() :
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d(new ClientPrivate)
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{
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d->proxyPort = 0;
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d->maxConnections = 4;
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setUserAgent("SimGear-" SG_STRINGIZE(SIMGEAR_VERSION));
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}
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Client::~Client()
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{
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}
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void Client::setMaxConnections(unsigned int maxCon)
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{
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if (maxCon < 1) {
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throw sg_range_exception("illegal HTTP::Client::setMaxConnections value");
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}
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d->maxConnections = maxCon;
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}
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void Client::update(int waitTimeout)
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{
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_poller.poll(waitTimeout);
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d->poller.poll(waitTimeout);
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bool waitingRequests = !d->pendingRequests.empty();
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ConnectionDict::iterator it = _connections.begin();
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for (; it != _connections.end(); ) {
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if (it->second->hasIdleTimeout() || it->second->hasError() ||
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it->second->hasErrorTimeout())
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ConnectionDict::iterator it = d->connections.begin();
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for (; it != d->connections.end(); ) {
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Connection* con = it->second;
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if (con->hasIdleTimeout() ||
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con->hasError() ||
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con->hasErrorTimeout() ||
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(!con->isActive() && waitingRequests))
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{
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// connection has been idle for a while, clean it up
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// (or has an error condition, again clean it up)
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// (or if we have requests waiting for a different host,
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// or an error condition
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ConnectionDict::iterator del = it++;
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delete del->second;
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_connections.erase(del);
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d->connections.erase(del);
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} else {
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if (it->second->shouldStartNext()) {
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it->second->tryStartNextRequest();
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}
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++it;
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}
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} // of connecion iteration
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} // of connection iteration
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if (waitingRequests && (d->connections.size() < d->maxConnections)) {
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RequestList waiting(d->pendingRequests);
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d->pendingRequests.clear();
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// re-submit all waiting requests in order; this takes care of
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// finding multiple pending items targetted to the same (new)
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// connection
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BOOST_FOREACH(Request_ptr req, waiting) {
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makeRequest(req);
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}
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}
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}
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void Client::makeRequest(const Request_ptr& r)
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{
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string host = r->host();
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int port = r->port();
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if (!_proxy.empty()) {
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host = _proxy;
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port = _proxyPort;
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if (!d->proxy.empty()) {
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host = d->proxy;
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port = d->proxyPort;
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}
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Connection* con = NULL;
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stringstream ss;
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ss << host << "-" << port;
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string connectionId = ss.str();
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bool havePending = !d->pendingRequests.empty();
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if (_connections.find(connectionId) == _connections.end()) {
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Connection* con = new Connection(this);
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con->setServer(host, port);
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_poller.addChannel(con);
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_connections[connectionId] = con;
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// assign request to an existing Connection.
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// various options exist here, examined in order
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if (d->connections.size() >= d->maxConnections) {
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ConnectionDict::iterator it = d->connections.find(connectionId);
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if (it == d->connections.end()) {
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// maximum number of connections active, queue this request
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// when a connection goes inactive, we'll start this one
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d->pendingRequests.push_back(r);
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return;
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}
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_connections[connectionId]->queueRequest(r);
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// scan for an idle Connection to the same host (likely if we're
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// retrieving multiple resources from the same host in quick succession)
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// if we have pending requests (waiting for a free Connection), then
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// force new requests on this id to always use the first Connection
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// (instead of the random selection below). This ensures that when
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// there's pressure on the number of connections to keep alive, one
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// host can't DoS every other.
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int count = 0;
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for (;it->first == connectionId; ++it, ++count) {
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if (havePending || !it->second->isActive()) {
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con = it->second;
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break;
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}
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}
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if (!con) {
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// we have at least one connection to the host, but they are
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// all active - we need to pick one to queue the request on.
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// we use random but round-robin would also work.
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int index = random() % count;
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for (it = d->connections.find(connectionId); index > 0; --index) { ; }
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con = it->second;
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}
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} // of at max connections limit
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// allocate a new connection object
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if (!con) {
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con = new Connection(this);
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con->setServer(host, port);
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d->poller.addChannel(con);
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d->connections.insert(d->connections.end(),
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ConnectionDict::value_type(connectionId, con));
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}
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con->queueRequest(r);
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}
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void Client::requestFinished(Connection* con)
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@ -749,20 +864,35 @@ void Client::requestFinished(Connection* con)
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void Client::setUserAgent(const string& ua)
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{
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_userAgent = ua;
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d->userAgent = ua;
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}
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const std::string& Client::userAgent() const
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{
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return d->userAgent;
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}
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const std::string& Client::proxyHost() const
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{
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return d->proxy;
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}
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const std::string& Client::proxyAuth() const
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{
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return d->proxyAuth;
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}
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void Client::setProxy(const string& proxy, int port, const string& auth)
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{
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_proxy = proxy;
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_proxyPort = port;
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_proxyAuth = auth;
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d->proxy = proxy;
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d->proxyPort = port;
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d->proxyAuth = auth;
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}
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bool Client::hasActiveRequests() const
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{
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ConnectionDict::const_iterator it = _connections.begin();
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for (; it != _connections.end(); ++it) {
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ConnectionDict::const_iterator it = d->connections.begin();
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for (; it != d->connections.end(); ++it) {
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if (it->second->isActive()) return true;
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}
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@ -1,10 +1,30 @@
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/**
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* \file HTTPClient.hxx - simple HTTP client engine for SimHear
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*/
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// Written by James Turner
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//
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// Copyright (C) 2013 James Turner <zakalawe@mac.com>
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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//
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#ifndef SG_HTTP_CLIENT_HXX
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#define SG_HTTP_CLIENT_HXX
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#include <map>
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#include <simgear/io/HTTPRequest.hxx>
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#include <simgear/io/sg_netChannel.hxx>
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namespace simgear
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{
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@ -12,12 +32,14 @@ namespace simgear
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namespace HTTP
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{
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// forward decls
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class Connection;
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class Client
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{
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public:
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Client();
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~Client();
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void update(int waitTimeout = 0);
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@ -26,14 +48,17 @@ public:
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void setUserAgent(const std::string& ua);
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void setProxy(const std::string& proxy, int port, const std::string& auth = "");
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const std::string& userAgent() const
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{ return _userAgent; }
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/**
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* Specify the maximum permitted simultaneous connections
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* (default value is 1)
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*/
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void setMaxConnections(unsigned int maxCons);
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const std::string& proxyHost() const
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{ return _proxy; }
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const std::string& userAgent() const;
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const std::string& proxyAuth() const
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{ return _proxyAuth; }
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const std::string& proxyHost() const;
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const std::string& proxyAuth() const;
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/**
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* predicate, check if at least one connection is active, with at
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@ -46,15 +71,8 @@ private:
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friend class Connection;
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friend class Request;
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std::string _userAgent;
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std::string _proxy;
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int _proxyPort;
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std::string _proxyAuth;
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NetChannelPoller _poller;
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// connections by host
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typedef std::map<std::string, Connection*> ConnectionDict;
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ConnectionDict _connections;
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class ClientPrivate;
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std::auto_ptr<ClientPrivate> d;
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};
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} // of namespace HTTP
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