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Logging: Remove customizable logging backends

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Separate code for customizing logging backends from this branch
This commit is contained in:
Daniel Lim Wee Soong 2018-03-16 11:56:40 +08:00
parent eee388588e
commit 373efd3158
5 changed files with 12 additions and 208 deletions
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75
src/common/logging/backend.h
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@ -6,81 +6,14 @@
#include <chrono>
#include <cstdarg>
#include <memory>
#include <string>
#include <utility>
#include <boost/optional.hpp>
#include "common/file_util.h"
#include "common/logging/filter.h"
#include "common/logging/log.h"
namespace Log {
class Filter;
/**
* Interface for logging backends. As loggers can be created and removed at runtime, this can be
* used by a frontend for adding a custom logging backend as needed
*/
class Backend {
public:
virtual ~Backend() = default;
virtual void SetFilter(const Filter& new_filter) {
filter = new_filter;
}
virtual const char* GetName() const = 0;
virtual void Write(const Entry& entry) = 0;
private:
Filter filter;
};
/**
* Backend that writes to stderr without any color commands
*/
class ConsoleBackend : public Backend {
public:
const char* GetName() const override {
return "console";
}
void Write(const Entry& entry) override;
};
/**
* Backend that writes to stderr and with color
*/
class ColorConsoleBackend : public Backend {
public:
const char* GetName() const override {
return "color_console";
}
void Write(const Entry& entry) override;
};
/**
* Backend that writes to a file passed into the constructor. If a log level is error or higher, it
* will flush immediately after writing
*/
class FileBackend : public Backend {
public:
explicit FileBackend(const std::string& filename);
const char* GetName() const override {
return "file";
}
void Write(const Entry& entry) override;
private:
FileUtil::IOFile file;
};
void AddBackend(std::unique_ptr<Backend> backend);
void RemoveBackend(const std::string& backend_name);
boost::optional<Backend*> GetBackend(const std::string& backend_name);
/**
* Returns the name of the passed log class as a C-string. Subclasses are separated by periods
* instead of underscores as in the enumeration.
@ -92,11 +25,5 @@ const char* GetLogClassName(Class log_class);
*/
const char* GetLevelName(Level log_level);
/**
* The global filter will prevent any messages from even being processed if they are filtered. Each
* backend can have a filter, but if the level is lower than the global filter, the backend will
* never get the message
*/
void SetGlobalFilter(const Filter& filter);
void SetFilter(Filter* filter);
} // namespace Log