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/* Copyright 2013 10gen Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "mongo/platform/basic.h"
#include <sstream>
#include <string>
#include <vector>
#include "mongo/logger/appender.h"
#include "mongo/logger/encoder.h"
#include "mongo/logger/message_event_utf8_encoder.h"
#include "mongo/logger/message_log_domain.h"
#include "mongo/logger/rotatable_file_appender.h"
#include "mongo/logger/rotatable_file_writer.h"
#include "mongo/platform/compiler.h"
#include "mongo/unittest/unittest.h"
#include "mongo/util/concurrency/thread_name.h"
#include "mongo/util/log.h"
using namespace mongo::logger;
namespace mongo {
namespace {
// TODO(schwerin): Have logger write to a different log from the global log, so that tests can
// redirect their global log output for examination.
class LogTest : public unittest::Test {
friend class LogTestAppender;
public:
LogTest() {
globalLogDomain()->clearAppenders();
_appenderHandle = globalLogDomain()->attachAppender(
MessageLogDomain::AppenderAutoPtr(new LogTestAppender(this)));
}
virtual ~LogTest() { globalLogDomain()->detachAppender(_appenderHandle); }
protected:
std::vector<std::string> _logLines;
private:
class LogTestAppender : public MessageLogDomain::EventAppender {
public:
explicit LogTestAppender(LogTest* ltest) : _ltest(ltest) {}
virtual ~LogTestAppender() {}
virtual Status append(const MessageLogDomain::Event& event) {
std::ostringstream _os;
if (!_encoder.encode(event, _os))
return Status(ErrorCodes::LogWriteFailed, "Failed to append to LogTestAppender.");
_ltest->_logLines.push_back(_os.str());
return Status::OK();
}
private:
LogTest *_ltest;
MessageEventUnadornedEncoder _encoder;
};
MessageLogDomain::AppenderHandle _appenderHandle;
};
TEST_F(LogTest, logContext) {
logContext("WHA!");
ASSERT_GREATER_THAN(_logLines.size(), 1U);
ASSERT_NOT_EQUALS(_logLines[0].find("WHA!"), std::string::npos);
// TODO(schwerin): Ensure that logContext rights a proper context to the log stream,
// including the address of the logContext() function.
//void const* logContextFn = reinterpret_cast<void const*>(logContext);
}
class CountAppender : public Appender<MessageEventEphemeral> {
public:
CountAppender() : _count(0) {}
virtual ~CountAppender() {}
virtual Status append(const MessageEventEphemeral& event) {
++_count;
return Status::OK();
}
int getCount() { return _count; }
private:
int _count;
};
/** Simple tests for detaching appenders. */
TEST_F(LogTest, DetachAppender) {
MessageLogDomain::AppenderAutoPtr countAppender(new CountAppender);
MessageLogDomain domain;
// Appending to the domain before attaching the appender does not affect the appender.
domain.append(MessageEventEphemeral(0ULL, LogSeverity::Log(), "", "1"));
ASSERT_EQUALS(0, dynamic_cast<CountAppender*>(countAppender.get())->getCount());
// Appending to the domain after attaching the appender does affect the appender.
MessageLogDomain::AppenderHandle handle = domain.attachAppender(countAppender);
domain.append(MessageEventEphemeral(0ULL, LogSeverity::Log(), "", "2"));
countAppender = domain.detachAppender(handle);
ASSERT_EQUALS(1, dynamic_cast<CountAppender*>(countAppender.get())->getCount());
// Appending to the domain after detaching the appender does not affect the appender.
domain.append(MessageEventEphemeral(0ULL, LogSeverity::Log(), "", "3"));
ASSERT_EQUALS(1, dynamic_cast<CountAppender*>(countAppender.get())->getCount());
}
class A {
public:
std::string toString() const {
log() << "Golly!\n";
return "Golly!";
}
};
// Tests that logging while in the midst of logging produces two distinct log messages, with the
// inner log message appearing before the outer.
TEST_F(LogTest, LogstreamBuilderReentrance) {
log() << "Logging A() -- " << A() << " -- done!" << std::endl;
ASSERT_EQUALS(2U, _logLines.size());
ASSERT_EQUALS(std::string("Golly!\n"), _logLines[0]);
ASSERT_EQUALS(std::string("Logging A() -- Golly! -- done!\n"), _logLines[1]);
}
//
// Instantiating this object is a basic test of static-initializer-time logging.
//
class B {
public:
B() { log() << "Exercising initializer time logging."; }
} b;
} // namespace
} // namespace mongo
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