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#include "filesystem_log_watcher.hpp"
#include "event_log.hpp"
#include "event_logs_object_type.hpp"
#include "event_service_manager.hpp"
#include "logging.hpp"
#include <sys/inotify.h>
#include <boost/asio/buffer.hpp>
#include <boost/asio/error.hpp>
#include <boost/asio/io_context.hpp>
#include <boost/asio/posix/stream_descriptor.hpp>
#include <array>
#include <bit>
#include <cstddef>
#include <cstring>
#include <fstream>
#include <functional>
#include <string>
#include <vector>
namespace redfish
{
void FilesystemLogWatcher::resetRedfishFilePosition()
{
// Control would be here when Redfish file is created.
// Reset File Position as new file is created
redfishLogFilePosition = 0;
}
void FilesystemLogWatcher::cacheRedfishLogFile()
{
// Open the redfish file and read till the last record.
std::ifstream logStream(redfishEventLogFile);
if (!logStream.good())
{
BMCWEB_LOG_ERROR(" Redfish log file open failed ");
return;
}
std::string logEntry;
while (std::getline(logStream, logEntry))
{
redfishLogFilePosition = logStream.tellg();
}
}
void FilesystemLogWatcher::readEventLogsFromFile()
{
std::ifstream logStream(redfishEventLogFile);
if (!logStream.good())
{
BMCWEB_LOG_ERROR(" Redfish log file open failed");
return;
}
std::vector<EventLogObjectsType> eventRecords;
std::string logEntry;
BMCWEB_LOG_DEBUG("Redfish log file: seek to {}",
static_cast<int>(redfishLogFilePosition));
// Get the read pointer to the next log to be read.
logStream.seekg(redfishLogFilePosition);
while (std::getline(logStream, logEntry))
{
BMCWEB_LOG_DEBUG("Redfish log file: found new event log entry");
// Update Pointer position
redfishLogFilePosition = logStream.tellg();
std::string idStr;
if (!event_log::getUniqueEntryID(logEntry, idStr))
{
BMCWEB_LOG_DEBUG(
"Redfish log file: could not get unique entry id for {}",
logEntry);
continue;
}
std::string timestamp;
std::string messageID;
std::vector<std::string> messageArgs;
if (event_log::getEventLogParams(logEntry, timestamp, messageID,
messageArgs) != 0)
{
BMCWEB_LOG_DEBUG("Read eventLog entry params failed for {}",
logEntry);
continue;
}
eventRecords.emplace_back(idStr, timestamp, messageID, messageArgs);
}
if (eventRecords.empty())
{
// No Records to send
BMCWEB_LOG_DEBUG("No log entries available to be transferred.");
return;
}
EventServiceManager::sendEventsToSubs(eventRecords);
}
static constexpr const char* redfishEventLogDir = "/var/log";
static constexpr const size_t iEventSize = sizeof(inotify_event);
void FilesystemLogWatcher::onINotify(const boost::system::error_code& ec,
std::size_t bytesTransferred)
{
if (ec == boost::asio::error::operation_aborted)
{
BMCWEB_LOG_DEBUG("Inotify was canceled (shutdown?)");
return;
}
if (ec)
{
BMCWEB_LOG_ERROR("Callback Error: {}", ec.message());
return;
}
BMCWEB_LOG_DEBUG("reading {} via inotify", bytesTransferred);
std::size_t index = 0;
while ((index + iEventSize) <= bytesTransferred)
{
struct inotify_event& event =
*std::bit_cast<struct inotify_event*>(&readBuffer[index]);
if (event.wd == dirWatchDesc)
{
if ((event.len == 0) ||
(index + iEventSize + event.len > bytesTransferred))
{
index += (iEventSize + event.len);
continue;
}
std::string fileName(&readBuffer[index + iEventSize]);
if (fileName != "redfish")
{
index += (iEventSize + event.len);
continue;
}
BMCWEB_LOG_DEBUG("Redfish log file created/deleted. event.name: {}",
fileName);
if (event.mask == IN_CREATE)
{
if (fileWatchDesc != -1)
{
BMCWEB_LOG_DEBUG("Remove and Add inotify watcher on "
"redfish event log file");
// Remove existing inotify watcher and add
// with new redfish event log file.
inotify_rm_watch(inotifyConn.native_handle(),
fileWatchDesc);
fileWatchDesc = -1;
}
fileWatchDesc =
inotify_add_watch(inotifyConn.native_handle(),
redfishEventLogFile, IN_MODIFY);
if (fileWatchDesc == -1)
{
BMCWEB_LOG_ERROR("inotify_add_watch failed for "
"redfish log file.");
return;
}
resetRedfishFilePosition();
readEventLogsFromFile();
}
else if ((event.mask == IN_DELETE) || (event.mask == IN_MOVED_TO))
{
if (fileWatchDesc != -1)
{
inotify_rm_watch(inotifyConn.native_handle(),
fileWatchDesc);
fileWatchDesc = -1;
}
}
}
else if (event.wd == fileWatchDesc)
{
if (event.mask == IN_MODIFY)
{
readEventLogsFromFile();
}
}
index += (iEventSize + event.len);
}
watchRedfishEventLogFile();
}
void FilesystemLogWatcher::watchRedfishEventLogFile()
{
inotifyConn.async_read_some(
boost::asio::buffer(readBuffer),
std::bind_front(&FilesystemLogWatcher::onINotify, this));
}
FilesystemLogWatcher::FilesystemLogWatcher(boost::asio::io_context& ioc) :
inotifyConn(ioc)
{
BMCWEB_LOG_DEBUG("starting Event Log Monitor");
int inotifyFd = inotify_init1(IN_NONBLOCK);
if (inotifyFd < 0)
{
BMCWEB_LOG_ERROR("inotify_init1 failed.");
return;
}
boost::system::error_code ec;
inotifyConn.assign(inotifyFd, ec);
if (ec)
{
BMCWEB_LOG_ERROR("Failed to assign fd {}", ec.message());
return;
}
// Add watch on directory to handle redfish event log file
// create/delete.
dirWatchDesc =
inotify_add_watch(inotifyConn.native_handle(), redfishEventLogDir,
IN_CREATE | IN_MOVED_TO | IN_DELETE);
if (dirWatchDesc < 0)
{
BMCWEB_LOG_ERROR("inotify_add_watch failed for event log directory.");
return;
}
// Watch redfish event log file for modifications.
fileWatchDesc = inotify_add_watch(inotifyConn.native_handle(),
redfishEventLogFile, IN_MODIFY);
if (fileWatchDesc < 0)
{
BMCWEB_LOG_ERROR("inotify_add_watch failed for redfish log file.");
// Don't return error if file not exist.
// Watch on directory will handle create/delete of file.
}
// monitor redfish event log file
watchRedfishEventLogFile();
if (redfishLogFilePosition != 0)
{
cacheRedfishLogFile();
}
}
} // namespace redfish
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