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/* worker.cpp
* Copyright (C) 2003-2005 Tommi Maekitalo
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* is provided AS IS, WITHOUT ANY WARRANTY; without even the implied
* warranty of MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, and
* NON-INFRINGEMENT. See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*/
#include "tnt/worker.h"
#include "tnt/dispatcher.h"
#include "tnt/job.h"
#include <tnt/httprequest.h>
#include <tnt/httpreply.h>
#include <tnt/httperror.h>
#include <tnt/http.h>
#include <tnt/poller.h>
#include <cxxtools/log.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <locale>
#include <errno.h>
log_define("tntnet.worker")
namespace
{
static const char stateStarting[] = "0 starting";
static const char stateWaitingForJob[] = "1 waiting for job";
static const char stateParsing[] = "2 parsing request";
static const char statePostParsing[] = "3 post parsing";
static const char stateDispatch[] = "4 dispatch";
static const char stateProcessingRequest[] = "5 processing request";
static const char stateFlush[] = "6 flush";
static const char stateSendReply[] = "7 send reply";
static const char stateSendError[] = "8 send error";
static const char stateStopping[] = "9 stopping";
}
namespace tnt
{
cxxtools::Mutex Worker::mutex;
unsigned Worker::nextThreadNumber = 0;
Worker::workers_type Worker::workers;
unsigned Worker::maxRequestTime = 600;
unsigned Worker::minThreads = 5;
bool Worker::enableCompression = true;
Worker::ComploaderPoolType Worker::comploaderPool;
Worker::Worker(Tntnet& app)
: application(app),
comploaderObject(comploaderPool.get()),
comploader(comploaderObject),
threadId(0),
state(stateStarting),
lastWaitTime(0)
{
log_debug("initialize thread " << threadId);
cxxtools::MutexLock lock(mutex);
workers.insert(this);
}
Worker::~Worker()
{
cxxtools::MutexLock lock(mutex);
workers.erase(this);
log_debug("delete worker " << threadId << " - " << workers.size() << " threads left - " << application.getQueue().getWaitThreadCount() << " waiting threads");
}
void Worker::run()
{
threadId = pthread_self();
Jobqueue& queue = application.getQueue();
log_debug("start thread " << threadId);
while (queue.getWaitThreadCount() < minThreads)
{
log_debug("waiting for job");
state = stateWaitingForJob;
Jobqueue::JobPtr j = queue.get();
if (Tntnet::shouldStop())
{
log_warn("stop worker");
break;
}
log_debug("got job - fd=" << j->getFd());
std::iostream& socket = j->getStream();
try
{
bool keepAlive;
do
{
time(&lastWaitTime);
log_debug("read request");
keepAlive = false;
state = stateParsing;
j->getParser().parse(socket);
state = statePostParsing;
if (socket.eof())
log_debug("eof");
else if (j->getParser().failed())
{
state = stateSendError;
log_warn("bad request");
socket << "HTTP/1.0 500 bad request\r\n"
"Content-Type: text/html\r\n"
"\r\n"
"<html><body><h1>Error</h1><p>bad request</p></body></html>"
<< std::endl;
}
else if (socket.fail())
log_error("socket failed");
else
{
j->getRequest().doPostParse();
j->setWrite();
keepAlive = processRequest(j->getRequest(), socket,
j->decrementKeepAliveCounter());
if (keepAlive)
{
j->setRead();
j->clear();
// if there is something to do and no threads waiting, we take
// the next job just to improve resposiveness.
if (queue.getWaitThreadCount() == 0
&& !queue.empty())
{
application.getPoller().addIdleJob(j);
keepAlive = false;
}
else
{
struct pollfd fd;
fd.fd = j->getFd();
fd.events = POLLIN;
if (::poll(&fd, 1, Job::getSocketReadTimeout()) == 0)
{
application.getPoller().addIdleJob(j);
keepAlive = false;
}
}
}
}
} while (keepAlive);
}
catch (const cxxtools::net::Timeout& e)
{
log_debug("timeout - put job in poller");
application.getPoller().addIdleJob(j);
}
catch (const cxxtools::net::Exception& e)
{
if (e.getErrno() != ENOENT)
log_warn("unexpected exception: " << e.what());
}
catch (const std::exception& e)
{
log_warn("unexpected exception: " << e.what());
}
}
time(&lastWaitTime);
log_debug("end worker-thread " << threadId);
state = stateStopping;
}
bool Worker::processRequest(HttpRequest& request, std::iostream& socket,
unsigned keepAliveCount)
{
// log message
log_info("process request: " << request.getMethod() << ' ' << request.getQuery()
<< " from client " << request.getPeerIp() << " user-Agent \"" << request.getUserAgent()
<< '"');
// create reply-object
HttpReply reply(socket);
reply.setVersion(request.getMajorVersion(), request.getMinorVersion());
reply.setMethod(request.getMethod());
std::locale loc = request.getLocale();
reply.out().imbue(loc);
reply.sout().imbue(loc);
if (request.keepAlive())
reply.setKeepAliveCounter(keepAliveCount);
if (enableCompression)
reply.setAcceptEncoding(request.getEncoding());
// process request
try
{
try
{
dispatch(request, reply);
if (!request.keepAlive() || !reply.keepAlive())
keepAliveCount = 0;
if (keepAliveCount > 0)
log_debug("keep alive");
else
{
log_debug("no keep alive request/reply="
<< request.keepAlive() << '/' << reply.keepAlive());
}
}
catch (const HttpError& e)
{
throw;
}
catch (const std::exception& e)
{
throw HttpError(HTTP_INTERNAL_SERVER_ERROR, e.what());
}
}
catch (const HttpError& e)
{
state = stateSendError;
log_warn("http-Error: " << e.what());
HttpReply reply(socket);
reply.setVersion(request.getMajorVersion(), request.getMinorVersion());
if (request.keepAlive())
reply.setKeepAliveCounter(keepAliveCount);
else
keepAliveCount = 0;
reply.out() << "<html><body><h1>Error</h1><p>"
<< e.what() << "</p></body></html>" << std::endl;
reply.sendReply(e.getErrcode(), e.getErrmsg());
}
return keepAliveCount > 0;
}
void Worker::dispatch(HttpRequest& request, HttpReply& reply)
{
state = stateDispatch;
const std::string& url = request.getUrl();
log_debug("dispatch " << request.getQuery());
if (!HttpRequest::checkUrl(url))
throw HttpError(HTTP_BAD_REQUEST, "illegal url");
request.setThreadScope(threadScope);
Dispatcher::PosType pos(application.getDispatcher(), request.getUrl());
while (true)
{
state = stateDispatch;
// pos.getNext() throws NotFoundException at end
Dispatcher::CompidentType ci = pos.getNext();
try
{
log_debug("load component " << ci);
Component& comp = comploader.fetchComp(ci, application.getDispatcher());
request.setPathInfo(ci.hasPathInfo() ? ci.getPathInfo() : url);
request.setArgs(ci.getArgs());
application.getScopemanager().preCall(request, ci.libname);
log_debug("call component " << ci << " path " << request.getPathInfo());
state = stateProcessingRequest;
unsigned http_return = comp(request, reply, request.getQueryParams());
if (http_return != DECLINED)
{
if (reply.isDirectMode())
{
log_info("request ready, returncode " << http_return);
state = stateFlush;
reply.out().flush();
}
else
{
log_info("request ready, returncode " << http_return << " - ContentSize: " << reply.getContentSize());
application.getScopemanager().postCall(request, reply, ci.libname);
state = stateSendReply;
reply.sendReply(http_return);
}
if (reply.out())
log_debug("reply sent");
else
log_warn("stream error");
return;
}
else
log_debug("component " << ci << " returned DECLINED");
}
catch (const cxxtools::dl::DlopenError& e)
{
log_warn("DlopenError catched - libname " << e.getLibname());
}
catch (const cxxtools::dl::SymbolNotFound& e)
{
log_warn("SymbolNotFound catched - symbol " << e.getSymbol());
}
}
throw NotFoundException(request.getUrl());
}
void Worker::timer()
{
time_t currentTime;
time(¤tTime);
cxxtools::MutexLock lock(mutex);
for (workers_type::iterator it = workers.begin();
it != workers.end(); ++it)
{
(*it)->healthCheck(currentTime);
}
}
void Worker::healthCheck(time_t currentTime)
{
if (state == stateProcessingRequest
&& lastWaitTime != 0
&& maxRequestTime > 0)
{
if (static_cast<unsigned>(currentTime - lastWaitTime) > maxRequestTime)
{
log_fatal("requesttime " << maxRequestTime << " seconds in thread "
<< threadId << " exceeded - exit process");
log_info("current state: " << state);
exit(111);
}
}
}
Worker::workers_type::size_type Worker::getCountThreads()
{
cxxtools::MutexLock lock(mutex);
return workers.size();
}
}
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