/***
* 一般的软件工程中，日志的作用都非常大，下面介绍一种c/c++代码生成日志的方法
* 支持带有时间戳；写入文件并不造成覆盖；支持多线程，进程
* 封装成 3种格式：debug,error,inf,三种输出
* 自定义 log文件的位置
* 自定义定义log文件的大小 超过则删除
* access()
F_OK 值为0，判断文件是否存在
R_OK 值为4，判断对文件是否有读权限
W_OK 值为2，判断对文件是否有写权限
X_OK 值为1，判断对文件是否有执行权限
* ::close() 是 global 函数 在某个类里面invoke
***/
#include <sys/types.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <errno.h>
#include <unistd.h>
#include <time.h>
#include <stdarg.h>
#include <iostream>
#include <termios.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <dirent.h>
#include <stdio.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <pthread.h>
#include "log.h"
#define TIMS_STAMP 1
#define WRITE_FILES 1
#define OPEN_FILES 1
#define BASE_PATH_LOG "./log"
Log log;
#if OPEN_FILES
ssize_t ts;
string g_oper;
int g_i;
#define CPRINT(log_type, str, args...) do { string format; format.append("%s,%s,").append(str); \
switch(log_type) \
{ \
case DEBUG_LOG: log.Cout(DEBUG_LOG, format.c_str(), "[DBG]", "[MD]",## args);break; \
case OPERATE_LOG: log.Cout(OPERATE_LOG, format.c_str(), "[OPR]", "[MD]", ## args);break; \
case ERROR_LOG: log.Cout(ERROR_LOG, format.c_str(), "[ERR]", "[MD]", ## args);break; \
default : log.Cout(DEBUG_LOG, format.c_str(), "[DBG]", "[MD]", ## args);break; \
}}while(0)
pthread_t threadId;
int Log:: open_files(int type)
{
string log_error;
log_error.append(log_base_path).append("./log_err.txt");
string log_warn;
log_warn.append(log_base_path).append("/log_war.txt");
string log_oper;
log_oper.append(log_base_path).append("./log_oper.txt");
string file_name;
int fd = -1;
switch( type)
{
case DEBUG_LOG: file_name = log_warn; break;
case OPERATE_LOG: file_name = log_oper; break;
case ERROR_LOG: file_name = log_error; break;
default: file_name = log_warn; break;
}
fd = open(file_name.data(), O_RDWR|O_CREAT|O_APPEND, 0755);
cout << file_name.data() << endl;
return fd;
}
#endif
#if WRITE_FILES
void Log:: write_files(int log_type, const char *ms,int len)
{
if(m_Fd == -1)
return;
ssize_t bw;//有符号整型
bw = ::write(m_Fd, ms, len);
ts = bw;
cout<< "ms =" <<ms<<endl;
if(bw == -1 )
{
int err;
err = errno;
close(m_Fd);
m_Fd = open_files(log_type);
if(m_Fd != -1)
{
char errBuf[100];
sprintf(errBuf, "Write log file error: errno = %d %s", err, strerror(err));
int num = ::write(m_Fd, errBuf, sizeof(errBuf));
if (num == -1)
{
cout<<"[Log] System ERROR: write error."<<endl;
close(m_Fd);
m_Fd = -1;
}
}
}
}
#endif
#if TIMS_STAMP //time stamp get system time
string Log::gettime()
{
char buf[100];
gettime(buf);
return string(buf);
}
void Log::gettime(char *buf)
{
struct tm T;
struct timeval tv;
gettimeofday(&tv, NULL);
localtime_r(&tv.tv_sec, &T);
int millisecond = tv.tv_usec/1000;
sprintf(buf, "%02d-%02d-%02d %02d:%02d:%02d %03d - ", T.tm_year+1900,T.tm_mon+1, T.tm_mday, T.tm_hour, T.tm_min, T.tm_sec, millisecond);
//printf("%02d-%02d-%02d %02d:%02d:%02d %03d - \n", T.tm_year+1900,T.tm_mon+1, T.tm_mday, T.tm_hour, T.tm_min, T.tm_sec, millisecond);
}
#endif
void Log::run(char *log_path)
{
log_base_path.clear();
log_base_path.append(log_path);
char cmdbuf[256];
sprintf(cmdbuf, "mkdir -p %s", log_path);
system(cmdbuf);
m_Fd = open_files(DEBUG_LOG);
}
void Log:: Cout(int log_type, const char* fmt, ...)
{
//pthread_mutex_unlock(&log_lock);
va_list ap;
va_start(ap, fmt);
//cout<<"fmt = "<<fmt<<endl;
char buf[500] = {0};
char timeStr[100] = {0};
gettime(timeStr);
memcpy(buf, timeStr, strlen(timeStr));
int len = strlen(buf);
//cout<<"len befor = "<<len<<endl;
//string tmp;
//tmp = buf;
//tmp.append(fmt).append("\n");
//cout<< "data = "<<tmp.data()<< " length = "<<tmp.length()<<endl;//length()
//int len = tmp.length();
len +=vsprintf(buf+len, fmt, ap);
va_end(ap);
if (buf[len -1] != '\n')
{
buf[len] = '\n';
len++;
}
write_files(log_type,buf, len);
//pthread_mutex_unlock(&log_lock);
if(log_type != DEBUG_LOG)
write_files(log_type, buf, len);
}
struct thread_info { /* Used as argument to thread_start() */
pthread_t thread_id; /* ID returned by pthread_create() */
int thread_num; /* Application-defined thread # */
char *argv_string; /* From command-line argument */
};
void * Log:: tst_log1(void* arg)
{
int i;
pthread_t threadID = pthread_self();
cout<< "threadID1 = "<<threadID <<endl;
while(1)
{
i++;
//cout<< i<<endl;
//pthread_mutex_lock(&log_lock);
g_oper.append(" tst_log1");
cout<<"tst_log1 = %s " <<g_oper.data()<<endl;
CPRINT(DEBUG_LOG,"threadID1 = %d , i = %d ,g_oper = %s ",threadID,i,g_oper.data());
//pthread_mutex_unlock(&log_lock);
//if(ts < 0)
//break;
usleep(2000 * 100);
}
//CPRINT(DEBUG_LOG,"tst_log2ID = %d",threadID);
}
void * Log:: tst_log2(void* arg)
{
int i;
pthread_t threadID = pthread_self();
cout<< "threadID2 = "<<threadID <<endl;
while(1)
{
i++;
//cout<< i<<endl;
pthread_mutex_lock(&log_lock);
g_oper = " tst_log2";
cout<<"tst_log2 = %s " <<g_oper.data()<<endl;
CPRINT(OPERATE_LOG,"threadID2 = %d , i = %d ,g_oper = %s ",threadID,i,g_oper.data());
pthread_mutex_unlock(&log_lock);
usleep(2000 * 100);
//sleep(0.5);
//if(ts < 0)
//break;
}
//CPRINT(DEBUG_LOG,"tst_log2ID = %d",threadID);
}
void Log:: excute()
{
thread_info *ti;
void *tret;
int ret1,ret2;
pthread_t thread_id1 ,thread_id2;
pthread_create(&thread_id1,NULL,tst_log1,NULL);
pthread_create(&thread_id2,NULL,tst_log2,NULL);
pthread_join(thread_id1,&tret);
pthread_join(thread_id2,&tret);
}
int main()
{
int i = 0;
log.run(BASE_PATH_LOG);
log.excute();
/*
while(i < 10)
{
//CPRINT(DEBUG_LOG,"wwwwwwwwwwwwwwwwwwwwwwwwwwwww %d",i);
i++;
cout<< i<<endl;
//if(ts < 0)
//break;
}
*/
return 0;
}
运行结果：
会再当前目录下生成log/log_war.txt 文件内容如下：
2019-03-29 15:59:48 489 - [DBG],[MD],threadID2 = -737954048 , i = 4 ,g_oper = tst_log2
2019-03-29 15:59:48 489 - [DBG],[MD],threadID2 = -737954048 , i = 4 ,g_oper = tst_log2
