項目幫助文檔的實現
代碼如下：
#ifndef __M_HELPER_H__
#define __M_HELPER_H__
#include <iostream>
#include <fstream>
#include <string>
#include <vector>
#include <sqlite3.h>
#include <random>
#include <sstream>
#include <iomanip>
#include <atomic>
#include <cstring>
#include <cerrno>
#include <sys/stat.h>
#include "mq_logger.hpp"namespace xypmq
{class SqliteHelper{public:typedef int (*SqliteCallback)(void *, int, char **, char **);SqliteHelper(const std::string &dbfile) : _dbfile(dbfile), _handler(nullptr) {}bool open(int safe_level = SQLITE_OPEN_FULLMUTEX){// int sqlite3_open_v2(const char *filename, sqlite3 **ppDb, int flags, const char *zVfs );int ret = sqlite3_open_v2(_dbfile.c_str(), &_handler, SQLITE_OPEN_READWRITE | SQLITE_OPEN_CREATE | safe_level, nullptr);if (ret != SQLITE_OK){ELOG("創建/打開sqlite數據庫失敗: %s", sqlite3_errmsg(_handler));return false;}return true;}bool exec(const std::string &sql, SqliteCallback cb, void *arg){// int sqlite3_exec(sqlite3*, char *sql, int (*callback)(void*,int,char**,char**), void* arg, char **err)int ret = sqlite3_exec(_handler, sql.c_str(), cb, arg, nullptr);if (ret != SQLITE_OK){ELOG("%s \n語句執行失敗: %s", sql.c_str(), sqlite3_errmsg(_handler));return false;}return true;}void close(){// int sqlite3_close_v2(sqlite3*)if (_handler)sqlite3_close_v2(_handler);}private:std::string _dbfile;sqlite3 *_handler;};class StrHelper{public:static size_t split(const std::string &str, const std::string &sep, std::vector<std::string> &result){// 分割的思想：// 1.從0位置開始找指定的字符，找到之后開始分割// 2.從上次查找的位置開始繼續往后查找指定字符size_t pos, idx = 0;while (idx < str.size()){pos = str.find(sep, idx);if (pos == std::string::npos){// 沒有找到，那么從查找位置截取到末尾result.push_back(str.substr(idx));return result.size();}// pos==idx,代表兩個分隔符之間沒有數據，或者說起始位置就是分割符if (pos == idx){idx = pos + sep.size();continue;}result.push_back(str.substr(idx, pos - idx));idx = pos + sep.size();}return result.size();}};class UUIDHelper{public:static std::string uuid(){std::random_device rd;// size_t num=rd();生成一個機器隨機數std::mt19937_64 gernator(rd()); // 通過梅森旋轉算法，生成一個偽隨機數// 我們要生成的是8個0~255的數std::uniform_int_distribution<int> distribution(0, 255);// std::cout<<distribution(gernator)<<std::endl;// 將生成的數字轉成16進制std::stringstream ss;for (int i = 0; i < 8; i++){ss << std::setw(2) << std::setfill('0') << std::hex << distribution(gernator);if (i == 3 || i == 5 || i == 7){ss << "-";}}// 定義一個原子類型整數，初始化為1static std::atomic<size_t> seq(1);size_t num = seq.fetch_add(1);for (int i = 7; i >= 0; i--){ss << std::setw(2) << std::setfill('0') << std::hex << ((num >> (i * 8)) & 0xff);if (i == 6)ss << "-";}return ss.str();}};class FileHelper{public:FileHelper(const std::string &filename) : _filename(filename) {}bool exists(){struct stat st;return (stat(_filename.c_str(), &st) == 0);}size_t size(){struct stat st;int ret = stat(_filename.c_str(), &st);if (ret < 0){return 0;}return st.st_size;}bool read(char *body, size_t offset, size_t len){// 1. 打開文件std::ifstream ifs(_filename, std::ios::binary | std::ios::in);if (ifs.is_open() == false){ELOG("%s 文件打開失敗！", _filename.c_str());return false;}// 2. 跳轉文件讀寫位置ifs.seekg(offset, std::ios::beg);// 3. 讀取文件數據ifs.read(body, len);if (ifs.good() == false){ELOG("%s 文件讀取數據失敗！！", _filename.c_str());ifs.close();return false;}// 4. 關閉文件ifs.close();return true;}bool read(std::string &body){// 獲取文件大小，根據文件大小調整body的空間size_t fsize = this->size();body.resize(fsize);return read(&body[0], 0, fsize);}bool write(const char *body, size_t offset, size_t len){// 1. 打開文件std::fstream fs(_filename, std::ios::binary | std::ios::in | std::ios::out);if (fs.is_open() == false){ELOG("%s 文件打開失敗！", _filename.c_str());return false;}// 2. 跳轉到文件指定位置fs.seekp(offset, std::ios::beg);// 3. 寫入數據fs.write(body, len);if (fs.good() == false){ELOG("%s 文件寫入數據失敗！！", _filename.c_str());fs.close();return false;}// 4. 關閉文件fs.close();return true;}bool write(const std::string &body){return write(body.c_str(), 0, body.size());}bool rename(const std::string &nname){return (::rename(_filename.c_str(), nname.c_str()) == 0);}static std::string parentDirectory(const std::string &filename){// /aaa/bb/ccc/ddd/test.txtsize_t pos = filename.find_last_of("/");if (pos == std::string::npos){// test.txtreturn "./";}std::string path = filename.substr(0, pos);return path;}static bool createFile(const std::string &filename){std::fstream ofs(filename, std::ios::binary | std::ios::out);if (ofs.is_open() == false){ELOG("%s 文件打開失敗！", filename.c_str());return false;}ofs.close();return true;}static bool removeFile(const std::string &filename){return (::remove(filename.c_str()) == 0);}static bool createDirectory(const std::string &path){// aaa/bbb/ccc cccc// 在多級路徑創建中，我們需要從第一個父級目錄開始創建size_t pos, idx = 0;while (idx < path.size()){pos = path.find("/", idx);if (pos == std::string::npos){return (mkdir(path.c_str(), 0775) == 0);}std::string subpath = path.substr(0, pos);int ret = mkdir(subpath.c_str(), 0775);if (ret != 0 && errno != EEXIST){ELOG("創建目錄 %s 失敗: %s", subpath.c_str(), strerror(errno));return false;}idx = pos + 1;}return true;}static bool removeDirectory(const std::string &path){// rm -rf path// system()std::string cmd = "rm -rf " + path;return (system(cmd.c_str()) != -1);}private:std::string _filename;};
}
#endif
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