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/*
Copyright (C) 2012-2021 Carl Hetherington <cth@carlh.net>
This file is part of DCP-o-matic.
DCP-o-matic 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.
DCP-o-matic is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with DCP-o-matic. If not, see <http://www.gnu.org/licenses/>.
*/
#include "file_log.h"
#include "cross.h"
#include "config.h"
#include <dcp/file.h>
#include <dcp/filesystem.h>
#include <cstdio>
#include <iostream>
#include <cerrno>
using std::cout;
using std::string;
using std::max;
using std::shared_ptr;
/** @param file Filename to write log to */
FileLog::FileLog (boost::filesystem::path file)
: _file (file)
{
set_types (Config::instance()->log_types());
}
FileLog::FileLog (boost::filesystem::path file, int types)
: _file (file)
{
set_types (types);
}
void
FileLog::do_log (shared_ptr<const LogEntry> entry)
{
dcp::File f(_file, "a");
if (!f) {
cout << "(could not log to " << _file.string() << " error " << errno << "): " << entry->get() << "\n";
return;
}
fprintf(f.get(), "%s\n", entry->get().c_str());
}
string
FileLog::head_and_tail (int amount) const
{
boost::mutex::scoped_lock lm (_mutex);
uintmax_t head_amount = amount;
uintmax_t tail_amount = amount;
boost::system::error_code ec;
uintmax_t size = dcp::filesystem::file_size(_file, ec);
if (size == static_cast<uintmax_t>(-1)) {
return "";
}
if (size < (head_amount + tail_amount)) {
head_amount = size;
tail_amount = 0;
}
dcp::File f(_file, "r");
if (!f) {
return "";
}
string out;
std::vector<char> buffer(max(head_amount, tail_amount) + 1);
int N = f.read(buffer.data(), 1, head_amount);
buffer[N] = '\0';
out += string (buffer.data());
if (tail_amount > 0) {
out += "\n .\n .\n .\n";
f.seek(- tail_amount - 1, SEEK_END);
N = f.read(buffer.data(), 1, tail_amount);
buffer[N] = '\0';
out += string(buffer.data()) + "\n";
}
return out;
}
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