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// Copyright Yahoo. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#pragma once
#include "log.h"
#include "lock.h"
#include <string>
namespace ns_log {
class Component;
class ComponentIterator;
class ControlFile {
friend class ComponentIterator;
friend class Component;
public:
enum Mode { READONLY, READWRITE, CREATE };
private:
Lock _fileBacking;
int _fileSize;
enum Mode _mode;
std::string _fileName;
void ensureHeader();
bool hasPrefix() { return (_prefix != NULL &&
_prefix[0] != '\0' &&
_prefix[0] != ' ' &&
_prefix[0] != '\n'); }
void ensureMapping();
void freeMapping();
bool extendMapping();
static unsigned int pageAlign(unsigned int len);
char *_prefix;
char *_mapBase;
int _mappedSize;
char *_firstComponent;
char *nextNewline(char *p);
static const int _maxMapSize = 200000;
static const int _maxPrefix = 64;
ControlFile(const ControlFile &);
ControlFile& operator = (const ControlFile &);
static bool hasWord(const char *word, const char *haystack);
static bool hasNegWord(const char *word, const char *haystack);
static void makeLogLevelArray(unsigned int *levels, unsigned int size,
const char *env);
static char *alignLevels(char *addr);
static unsigned int findOnOffStatus(Logger::LogLevel level,
const char *levelsString);
public:
ComponentIterator getComponentIterator();
explicit ControlFile(const char *file, enum Mode);
void setPrefix(const char *prefix);
~ControlFile();
unsigned int *getLevels(const char *name);
void ensureComponent(const char *pattern);
static unsigned int *defaultLevels() __attribute__((noinline));
// make sure in-memory changes are synchronized to disk
void flush();
// Construct the name of the control file for <serviceName>
// returns true if successful, false if not.
// Makes the name into <buf> which is of length <bufLen>.
static bool makeName(const char *serviceName, char *buf, int bufLen);
};
class ComponentIterator {
private:
ControlFile *_cf;
char *_next;
ComponentIterator& operator = (const ComponentIterator &);
public:
ComponentIterator(const ComponentIterator &ci);
ComponentIterator(ControlFile *cf);
~ComponentIterator() {}
Component *next();
};
} // end namespace ns_log
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