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/*-
* Copyright (c) 2011, 2012, 2013, 2014 Spectra Logic Corporation
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions, and the following disclaimer,
* without modification.
* 2. Redistributions in binary form must reproduce at minimum a disclaimer
* substantially similar to the "NO WARRANTY" disclaimer below
* ("Disclaimer") and any redistribution must be conditioned upon
* including a substantially similar Disclaimer requirement for further
* binary redistribution.
*
* NO WARRANTY
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDERS OR CONTRIBUTORS BE LIABLE FOR SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
* IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGES.
*
* Authors: Justin T. Gibbs (Spectra Logic Corporation)
*/
/**
* \file consumer.cc
*/
#include <sys/cdefs.h>
#include <sys/poll.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <syslog.h>
#include <unistd.h>
#include <cstdarg>
#include <cstring>
#include <list>
#include <map>
#include <string>
#include "guid.h"
#include "event.h"
#include "event_factory.h"
#include "exception.h"
#include "consumer.h"
__FBSDID("$FreeBSD$");
/*================================== Macros ==================================*/
#define NUM_ELEMENTS(x) (sizeof(x) / sizeof(*x))
/*============================ Namespace Control =============================*/
using std::string;
namespace DevdCtl
{
/*============================= Class Definitions ============================*/
/*----------------------------- DevdCtl::Consumer ----------------------------*/
//- Consumer Static Private Data -----------------------------------------------
const char Consumer::s_devdSockPath[] = "/var/run/devd.seqpacket.pipe";
//- Consumer Public Methods ----------------------------------------------------
Consumer::Consumer(Event::BuildMethod *defBuilder,
EventFactory::Record *regEntries,
size_t numEntries)
: m_devdSockFD(-1),
m_eventFactory(defBuilder),
m_replayingEvents(false)
{
m_eventFactory.UpdateRegistry(regEntries, numEntries);
}
Consumer::~Consumer()
{
DisconnectFromDevd();
}
bool
Consumer::ConnectToDevd()
{
struct sockaddr_un devdAddr;
int sLen;
int result;
if (m_devdSockFD != -1) {
/* Already connected. */
syslog(LOG_DEBUG, "%s: Already connected.", __func__);
return (true);
}
syslog(LOG_INFO, "%s: Connecting to devd.", __func__);
memset(&devdAddr, 0, sizeof(devdAddr));
devdAddr.sun_family= AF_UNIX;
strlcpy(devdAddr.sun_path, s_devdSockPath, sizeof(devdAddr.sun_path));
sLen = SUN_LEN(&devdAddr);
m_devdSockFD = socket(AF_UNIX, SOCK_SEQPACKET | SOCK_NONBLOCK, 0);
if (m_devdSockFD == -1)
err(1, "Unable to create socket");
result = connect(m_devdSockFD,
reinterpret_cast<sockaddr *>(&devdAddr),
sLen);
if (result == -1) {
syslog(LOG_INFO, "Unable to connect to devd");
DisconnectFromDevd();
return (false);
}
syslog(LOG_INFO, "Connection to devd successful");
return (true);
}
void
Consumer::DisconnectFromDevd()
{
if (m_devdSockFD != -1) {
syslog(LOG_INFO, "Disconnecting from devd.");
close(m_devdSockFD);
}
m_devdSockFD = -1;
}
std::string
Consumer::ReadEvent()
{
char buf[MAX_EVENT_SIZE + 1];
ssize_t len;
len = ::recv(m_devdSockFD, buf, MAX_EVENT_SIZE, MSG_WAITALL);
if (len == -1)
return (std::string(""));
else {
/* NULL-terminate the result */
buf[len] = '\0';
return (std::string(buf));
}
}
void
Consumer::ReplayUnconsumedEvents(bool discardUnconsumed)
{
EventList::iterator event(m_unconsumedEvents.begin());
bool replayed_any = (event != m_unconsumedEvents.end());
m_replayingEvents = true;
if (replayed_any)
syslog(LOG_INFO, "Started replaying unconsumed events");
while (event != m_unconsumedEvents.end()) {
bool consumed((*event)->Process());
if (consumed || discardUnconsumed) {
delete *event;
event = m_unconsumedEvents.erase(event);
} else {
event++;
}
}
if (replayed_any)
syslog(LOG_INFO, "Finished replaying unconsumed events");
m_replayingEvents = false;
}
bool
Consumer::SaveEvent(const Event &event)
{
if (m_replayingEvents)
return (false);
m_unconsumedEvents.push_back(event.DeepCopy());
return (true);
}
Event *
Consumer::NextEvent()
{
if (!Connected())
return(NULL);
Event *event(NULL);
try {
string evString;
evString = ReadEvent();
if (! evString.empty()) {
Event::TimestampEventString(evString);
event = Event::CreateEvent(m_eventFactory, evString);
}
} catch (const Exception &exp) {
exp.Log();
DisconnectFromDevd();
}
return (event);
}
/* Capture and process buffered events. */
void
Consumer::ProcessEvents()
{
Event *event;
while ((event = NextEvent()) != NULL) {
if (event->Process())
SaveEvent(*event);
delete event;
}
}
void
Consumer::FlushEvents()
{
std::string s;
do
s = ReadEvent();
while (! s.empty()) ;
}
bool
Consumer::EventsPending()
{
struct pollfd fds[1];
int result;
do {
fds->fd = m_devdSockFD;
fds->events = POLLIN;
fds->revents = 0;
result = poll(fds, NUM_ELEMENTS(fds), /*timeout*/0);
} while (result == -1 && errno == EINTR);
if (result == -1)
err(1, "Polling for devd events failed");
if ((fds->revents & POLLERR) != 0)
throw Exception("Consumer::EventsPending(): "
"POLLERR detected on devd socket.");
if ((fds->revents & POLLHUP) != 0)
throw Exception("Consumer::EventsPending(): "
"POLLHUP detected on devd socket.");
return ((fds->revents & POLLIN) != 0);
}
} // namespace DevdCtl
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