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/**
* Copyright (C) 2018-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program 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
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/basic.h"
#include "mongo/logv2/ramlog.h"
#include "mongo/base/init.h"
#include "mongo/base/status.h"
#include "mongo/util/map_util.h"
#include "mongo/util/str.h"
namespace mongo {
namespace logv2 {
using std::string;
namespace {
typedef std::map<string, RamLog*> RM;
stdx::mutex* _namedLock = NULL; // NOLINT
RM* _named = NULL;
} // namespace
RamLog::RamLog(const std::string& name) : _name(name), _totalLinesWritten(0), _lastWrite(0) {
clear();
for (int i = 0; i < N; i++)
lines[i][C - 1] = 0;
}
RamLog::~RamLog() {}
void RamLog::write(const std::string& str) {
stdx::lock_guard<stdx::mutex> lk(_mutex);
_lastWrite = time(0);
_totalLinesWritten++;
char* p = lines[(h + n) % N];
unsigned sz = str.size() + 1;
if (1 == sz)
return;
if (sz < C) {
memcpy(p, str.c_str(), sz);
} else {
memcpy(p, str.c_str(), C - 1);
*(p + C - 1) = '\0';
}
if (n < N)
n++;
else
h = (h + 1) % N;
}
void RamLog::clear() {
stdx::lock_guard<stdx::mutex> lk(_mutex);
_totalLinesWritten = 0;
_lastWrite = 0;
h = 0;
n = 0;
for (int i = 0; i < N; i++)
lines[i][0] = 0;
}
time_t RamLog::LineIterator::lastWrite() {
return _ramlog->_lastWrite;
}
long long RamLog::LineIterator::getTotalLinesWritten() {
return _ramlog->_totalLinesWritten;
}
const char* RamLog::getLine_inlock(unsigned lineNumber) const {
if (lineNumber >= n)
return "";
return lines[(lineNumber + h) % N]; // h = 0 unless n == N, hence modulo N.
}
int RamLog::repeats(const std::vector<const char*>& v, int i) {
for (int j = i - 1; j >= 0 && j + 8 > i; j--) {
if (strcmp(v[i] + 24, v[j] + 24) == 0) {
for (int x = 1;; x++) {
if (j + x == i)
return j;
if (i + x >= (int)v.size())
return -1;
if (strcmp(v[i + x] + 24, v[j + x] + 24))
return -1;
}
return -1;
}
}
return -1;
}
string RamLog::clean(const std::vector<const char*>& v, int i, string line) {
if (line.empty())
line = v[i];
if (i > 0 && strncmp(v[i], v[i - 1], 11) == 0)
return string(" ") + line.substr(11);
return v[i];
}
/* turn http:... into an anchor */
string RamLog::linkify(const char* s) {
const char* p = s;
const char* h = strstr(p, "http://");
if (h == 0)
return s;
const char* sp = h + 7;
while (*sp && *sp != ' ')
sp++;
string url(h, sp - h);
std::stringstream ss;
ss << string(s, h - s) << "<a href=\"" << url << "\">" << url << "</a>" << sp;
return ss.str();
}
RamLog::LineIterator::LineIterator(RamLog* ramlog)
: _ramlog(ramlog), _lock(ramlog->_mutex), _nextLineIndex(0) {}
// ---------------
// static things
// ---------------
RamLog* RamLog::get(const std::string& name) {
if (!_namedLock) {
// Guaranteed to happen before multi-threaded operation.
_namedLock = new stdx::mutex(); // NOLINT
}
stdx::lock_guard<stdx::mutex> lk(*_namedLock);
if (!_named) {
// Guaranteed to happen before multi-threaded operation.
_named = new RM();
}
RamLog* result = mapFindWithDefault(*_named, name, static_cast<RamLog*>(NULL));
if (!result) {
result = new RamLog(name);
(*_named)[name] = result;
}
return result;
}
RamLog* RamLog::getIfExists(const std::string& name) {
if (!_named)
return NULL;
stdx::lock_guard<stdx::mutex> lk(*_namedLock);
return mapFindWithDefault(*_named, name, static_cast<RamLog*>(NULL));
}
void RamLog::getNames(std::vector<string>& names) {
if (!_named)
return;
stdx::lock_guard<stdx::mutex> lk(*_namedLock);
for (RM::iterator i = _named->begin(); i != _named->end(); ++i) {
if (i->second->n)
names.push_back(i->first);
}
}
/**
* Ensures that RamLog::get() is called at least once during single-threaded operation,
* ensuring that _namedLock and _named are initialized safely.
*/
MONGO_INITIALIZER(RamLogCatalogV2)(InitializerContext*) {
if (!_namedLock) {
if (_named) {
return Status(ErrorCodes::InternalError,
"Inconsistent intiailization of RamLogCatalog.");
}
_namedLock = new stdx::mutex(); // NOLINT
_named = new RM();
}
return Status::OK();
}
} // namespace logv2
} // namespace mongo
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