目录
SERVER模块:
管理⽅⾯:
Buffer模块:
Socket模块:
Channel模块:
Connection模块:
Acceptor模块:
TimerQueue模块:
Poller模块:
EventLoop模块:
TcpServer模块:
HTTP协议组件模块:
Util模块:
HttpRequest模块:
HttpContext模块:
HttpServer模块:
class Buffer {
private:
std::vector _buffer; //使用vector进行内存空间管理
uint64_t _reader_idx; //读偏移
uint64_t _writer_idx; //写偏移
public:
Buffer():_reader_idx(0), _writer_idx(0), _buffer(BUFFER_DEFAULT_SIZE){}
char *Begin() { return &*_buffer.begin(); }
//获取当前写入起始地址, _buffer的空间起始地址,加上写偏移量
char *WritePosition() { return Begin() + _writer_idx; }
//获取当前读取起始地址
char *ReadPosition() { return Begin() + _reader_idx; }
//获取缓冲区末尾空闲空间大小--写偏移之后的空闲空间, 总体空间大小减去写偏移
uint64_t TailIdleSize() { return _buffer.size() - _writer_idx; }
//获取缓冲区起始空闲空间大小--读偏移之前的空闲空间
uint64_t HeadIdleSize() { return _reader_idx; }
//获取可读数据大小 = 写偏移 - 读偏移
uint64_t ReadAbleSize() { return _writer_idx - _reader_idx; }
//将读偏移向后移动
void MoveReadOffset(uint64_t len) {
if (len == 0) return;
//向后移动的大小,必须小于可读数据大小
assert(len <= ReadAbleSize());
_reader_idx += len;
}
//将写偏移向后移动
void MoveWriteOffset(uint64_t len) {
//向后移动的大小,必须小于当前后边的空闲空间大小
assert(len <= TailIdleSize());
_writer_idx += len;
}
//确保可写空间足够(整体空闲空间够了就移动数据,否则就扩容)
void EnsureWriteSpace(uint64_t len) {
//如果末尾空闲空间大小足够,直接返回
if (TailIdleSize() >= len) { return; }
//末尾空闲空间不够,则判断加上起始位置的空闲空间大小是否足够, 够了就将数据移动到起始位置
if (len <= TailIdleSize() + HeadIdleSize()) {
//将数据移动到起始位置
uint64_t rsz = ReadAbleSize();//把当前数据大小先保存起来
std::copy(ReadPosition(), ReadPosition() + rsz, Begin());//把可读数据拷贝到起始位置
_reader_idx = 0; //将读偏移归0
_writer_idx = rsz; //将写位置置为可读数据大小, 因为当前的可读数据大小就是写偏移量
}else {
//总体空间不够,则需要扩容,不移动数据,直接给写偏移之后扩容足够空间即可
DBG_LOG("RESIZE %ld", _writer_idx + len);
_buffer.resize(_writer_idx + len);
}
}
//写入数据
void Write(const void *data, uint64_t len) {
//1. 保证有足够空间,2. 拷贝数据进去
if (len == 0) return;
EnsureWriteSpace(len);
const char *d = (const char *)data;
std::copy(d, d + len, WritePosition());
}
void WriteAndPush(const void *data, uint64_t len) {
Write(data, len);
MoveWriteOffset(len);
}
void WriteString(const std::string &data) {
return Write(data.c_str(), data.size());
}
void WriteStringAndPush(const std::string &data) {
WriteString(data);
MoveWriteOffset(data.size());
}
void WriteBuffer(Buffer &data) {
return Write(data.ReadPosition(), data.ReadAbleSize());
}
void WriteBufferAndPush(Buffer &data) {
WriteBuffer(data);
MoveWriteOffset(data.ReadAbleSize());
}
//读取数据
void Read(void *buf, uint64_t len) {
//要求要获取的数据大小必须小于可读数据大小
assert(len <= ReadAbleSize());
std::copy(ReadPosition(), ReadPosition() + len, (char*)buf);
}
void ReadAndPop(void *buf, uint64_t len) {
Read(buf, len);
MoveReadOffset(len);
}
std::string ReadAsString(uint64_t len) {
//要求要获取的数据大小必须小于可读数据大小
assert(len <= ReadAbleSize());
std::string str;
str.resize(len);
Read(&str[0], len);
return str;
}
std::string ReadAsStringAndPop(uint64_t len) {
assert(len <= ReadAbleSize());
std::string str = ReadAsString(len);
MoveReadOffset(len);
return str;
}
char *FindCRLF() {
char *res = (char*)memchr(ReadPosition(), '\n', ReadAbleSize());
return res;
}
/*通常获取一行数据,这种情况针对是*/
std::string GetLine() {
char *pos = FindCRLF();
if (pos == NULL) {
return "";
}
// +1是为了把换行字符也取出来。
return ReadAsString(pos - ReadPosition() + 1);
}
std::string GetLineAndPop() {
std::string str = GetLine();
MoveReadOffset(str.size());
return str;
}
//清空缓冲区
void Clear() {
//只需要将偏移量归0即可
_reader_idx = 0;
_writer_idx = 0;
}
};
class Socket {
private:
int _sockfd;
public:
Socket():_sockfd(-1) {}
Socket(int fd): _sockfd(fd) {}
~Socket() { Close(); }
int Fd() { return _sockfd; }
//创建套接字
bool Create() {
// int socket(int domain, int type, int protocol)
_sockfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
if (_sockfd < 0) {
ERR_LOG("CREATE SOCKET FAILED!!");
return false;
}
return true;
}
//绑定地址信息
bool Bind(const std::string &ip, uint16_t port) {
struct sockaddr_in addr;
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = inet_addr(ip.c_str());
socklen_t len = sizeof(struct sockaddr_in);
// int bind(int sockfd, struct sockaddr*addr, socklen_t len);
int ret = bind(_sockfd, (struct sockaddr*)&addr, len);
if (ret < 0) {
ERR_LOG("BIND ADDRESS FAILED!");
return false;
}
return true;
}
//开始监听
bool Listen(int backlog = MAX_LISTEN) {
// int listen(int backlog)
int ret = listen(_sockfd, backlog);
if (ret < 0) {
ERR_LOG("SOCKET LISTEN FAILED!");
return false;
}
return true;
}
//向服务器发起连接
bool Connect(const std::string &ip, uint16_t port) {
struct sockaddr_in addr;
addr.sin_family = AF_INET;
addr.sin_port = htons(port);
addr.sin_addr.s_addr = inet_addr(ip.c_str());
socklen_t len = sizeof(struct sockaddr_in);
// int connect(int sockfd, struct sockaddr*addr, socklen_t len);
int ret = connect(_sockfd, (struct sockaddr*)&addr, len);
if (ret < 0) {
ERR_LOG("CONNECT SERVER FAILED!");
return false;
}
return true;
}
//获取新连接
int Accept() {
// int accept(int sockfd, struct sockaddr *addr, socklen_t *len);
int newfd = accept(_sockfd, NULL, NULL);
if (newfd < 0) {
ERR_LOG("SOCKET ACCEPT FAILED!");
return -1;
}
return newfd;
}
//接收数据
ssize_t Recv(void *buf, size_t len, int flag = 0) {
// ssize_t recv(int sockfd, void *buf, size_t len, int flag);
ssize_t ret = recv(_sockfd, buf, len, flag);
if (ret <= 0) {
//EAGAIN 当前socket的接收缓冲区中没有数据了,在非阻塞的情况下才会有这个错误
//EINTR 表示当前socket的阻塞等待,被信号打断了,
if (errno == EAGAIN || errno == EINTR) {
return 0;//表示这次接收没有接收到数据
}
ERR_LOG("SOCKET RECV FAILED!!");
return -1;
}
return ret; //实际接收的数据长度
}
ssize_t NonBlockRecv(void *buf, size_t len) {
return Recv(buf, len, MSG_DONTWAIT); // MSG_DONTWAIT 表示当前接收为非阻塞。
}
//发送数据
ssize_t Send(const void *buf, size_t len, int flag = 0) {
// ssize_t send(int sockfd, void *data, size_t len, int flag);
ssize_t ret = send(_sockfd, buf, len, flag);
if (ret < 0) {
if (errno == EAGAIN || errno == EINTR) {
return 0;
}
ERR_LOG("SOCKET SEND FAILED!!");
return -1;
}
return ret;//实际发送的数据长度
}
ssize_t NonBlockSend(void *buf, size_t len) {
if (len == 0) return 0;
return Send(buf, len, MSG_DONTWAIT); // MSG_DONTWAIT 表示当前发送为非阻塞。
}
//关闭套接字
void Close() {
if (_sockfd != -1) {
close(_sockfd);
_sockfd = -1;
}
}
//创建一个服务端连接
bool CreateServer(uint16_t port, const std::string &ip = "0.0.0.0", bool block_flag = false) {
//1. 创建套接字,2. 绑定地址,3. 开始监听,4. 设置非阻塞, 5. 启动地址重用
if (Create() == false) return false;
if (block_flag) NonBlock();
if (Bind(ip, port) == false) return false;
if (Listen() == false) return false;
ReuseAddress();
return true;
}
//创建一个客户端连接
bool CreateClient(uint16_t port, const std::string &ip) {
//1. 创建套接字,2.指向连接服务器
if (Create() == false) return false;
if (Connect(ip, port) == false) return false;
return true;
}
//设置套接字选项---开启地址端口重用
void ReuseAddress() {
// int setsockopt(int fd, int leve, int optname, void *val, int vallen)
int val = 1;
setsockopt(_sockfd, SOL_SOCKET, SO_REUSEADDR, (void*)&val, sizeof(int));
val = 1;
setsockopt(_sockfd, SOL_SOCKET, SO_REUSEPORT, (void*)&val, sizeof(int));
}
//设置套接字阻塞属性-- 设置为非阻塞
void NonBlock() {
//int fcntl(int fd, int cmd, ... /* arg */ );
int flag = fcntl(_sockfd, F_GETFL, 0);
fcntl(_sockfd, F_SETFL, flag | O_NONBLOCK);
}
};
class Channel {
private:
int _fd;
EventLoop *_loop;
uint32_t _events; // 当前需要监控的事件
uint32_t _revents; // 当前连接触发的事件
using EventCallback = std::function;
EventCallback _read_callback; //可读事件被触发的回调函数
EventCallback _write_callback; //可写事件被触发的回调函数
EventCallback _error_callback; //错误事件被触发的回调函数
EventCallback _close_callback; //连接断开事件被触发的回调函数
EventCallback _event_callback; //任意事件被触发的回调函数
public:
Channel(EventLoop *loop, int fd):_fd(fd), _events(0), _revents(0), _loop(loop) {}
int Fd() { return _fd; }
uint32_t Events() { return _events; }//获取想要监控的事件
void SetREvents(uint32_t events) { _revents = events; }//设置实际就绪的事件
void SetReadCallback(const EventCallback &cb) { _read_callback = cb; }
void SetWriteCallback(const EventCallback &cb) { _write_callback = cb; }
void SetErrorCallback(const EventCallback &cb) { _error_callback = cb; }
void SetCloseCallback(const EventCallback &cb) { _close_callback = cb; }
void SetEventCallback(const EventCallback &cb) { _event_callback = cb; }
//当前是否监控了可读
bool ReadAble() { return (_events & EPOLLIN); }
//当前是否监控了可写
bool WriteAble() { return (_events & EPOLLOUT); }
//启动读事件监控
void EnableRead() { _events |= EPOLLIN; Update(); }
//启动写事件监控
void EnableWrite() { _events |= EPOLLOUT; Update(); }
//关闭读事件监控
void DisableRead() { _events &= ~EPOLLIN; Update(); }
//关闭写事件监控
void DisableWrite() { _events &= ~EPOLLOUT; Update(); }
//关闭所有事件监控
void DisableAll() { _events = 0; Update(); }
//移除监控
void Remove();
void Update();
//事件处理,一旦连接触发了事件,就调用这个函数,自己触发了什么事件如何处理自己决定
void HandleEvent() {
if ((_revents & EPOLLIN) || (_revents & EPOLLRDHUP) || (_revents & EPOLLPRI)) {
/*不管任何事件,都调用的回调函数*/
if (_read_callback) _read_callback();
}
/*有可能会释放连接的操作事件,一次只处理一个*/
if (_revents & EPOLLOUT) {
if (_write_callback) _write_callback();
}else if (_revents & EPOLLERR) {
if (_error_callback) _error_callback();//一旦出错,就会释放连接,因此要放到前边调用任意回调
}else if (_revents & EPOLLHUP) {
if (_close_callback) _close_callback();
}
if (_event_callback) _event_callback();
}
};
class Connection : public std::enable_shared_from_this {
private:
uint64_t _conn_id; // 连接的唯一ID,便于连接的管理和查找
//uint64_t _timer_id; //定时器ID,必须是唯一的,这块为了简化操作使用conn_id作为定时器ID
int _sockfd; // 连接关联的文件描述符
bool _enable_inactive_release; // 连接是否启动非活跃销毁的判断标志,默认为false
EventLoop *_loop; // 连接所关联的一个EventLoop
ConnStatu _statu; // 连接状态
Socket _socket; // 套接字操作管理
Channel _channel; // 连接的事件管理
Buffer _in_buffer; // 输入缓冲区---存放从socket中读取到的数据
Buffer _out_buffer; // 输出缓冲区---存放要发送给对端的数据
Any _context; // 请求的接收处理上下文
/*这四个回调函数,是让服务器模块来设置的(其实服务器模块的处理回调也是组件使用者设置的)*/
/*换句话说,这几个回调都是组件使用者使用的*/
using ConnectedCallback = std::function;
using MessageCallback = std::function;
using ClosedCallback = std::function;
using AnyEventCallback = std::function;
ConnectedCallback _connected_callback;
MessageCallback _message_callback;
ClosedCallback _closed_callback;
AnyEventCallback _event_callback;
/*组件内的连接关闭回调--组件内设置的,因为服务器组件内会把所有的连接管理起来,一旦某个连接要关闭*/
/*就应该从管理的地方移除掉自己的信息*/
ClosedCallback _server_closed_callback;
private:
/*五个channel的事件回调函数*/
//描述符可读事件触发后调用的函数,接收socket数据放到接收缓冲区中,然后调用_message_callback
void HandleRead() {
//1. 接收socket的数据,放到缓冲区
char buf[65536];
ssize_t ret = _socket.NonBlockRecv(buf, 65535);
if (ret < 0) {
//出错了,不能直接关闭连接
return ShutdownInLoop();
}
//这里的等于0表示的是没有读取到数据,而并不是连接断开了,连接断开返回的是-1
//将数据放入输入缓冲区,写入之后顺便将写偏移向后移动
_in_buffer.WriteAndPush(buf, ret);
//2. 调用message_callback进行业务处理
if (_in_buffer.ReadAbleSize() > 0) {
//shared_from_this--从当前对象自身获取自身的shared_ptr管理对象
return _message_callback(shared_from_this(), &_in_buffer);
}
}
//描述符可写事件触发后调用的函数,将发送缓冲区中的数据进行发送
void HandleWrite() {
//_out_buffer中保存的数据就是要发送的数据
ssize_t ret = _socket.NonBlockSend(_out_buffer.ReadPosition(), _out_buffer.ReadAbleSize());
if (ret < 0) {
//发送错误就该关闭连接了,
if (_in_buffer.ReadAbleSize() > 0) {
_message_callback(shared_from_this(), &_in_buffer);
}
return Release();//这时候就是实际的关闭释放操作了。
}
_out_buffer.MoveReadOffset(ret);//千万不要忘了,将读偏移向后移动
if (_out_buffer.ReadAbleSize() == 0) {
_channel.DisableWrite();// 没有数据待发送了,关闭写事件监控
//如果当前是连接待关闭状态,则有数据,发送完数据释放连接,没有数据则直接释放
if (_statu == DISCONNECTING) {
return Release();
}
}
return;
}
//描述符触发挂断事件
void HandleClose() {
/*一旦连接挂断了,套接字就什么都干不了了,因此有数据待处理就处理一下,完毕关闭连接*/
if (_in_buffer.ReadAbleSize() > 0) {
_message_callback(shared_from_this(), &_in_buffer);
}
return Release();
}
//描述符触发出错事件
void HandleError() {
return HandleClose();
}
//描述符触发任意事件: 1. 刷新连接的活跃度--延迟定时销毁任务; 2. 调用组件使用者的任意事件回调
void HandleEvent() {
if (_enable_inactive_release == true) { _loop->TimerRefresh(_conn_id); }
if (_event_callback) { _event_callback(shared_from_this()); }
}
//连接获取之后,所处的状态下要进行各种设置(启动读监控,调用回调函数)
void EstablishedInLoop() {
// 1. 修改连接状态; 2. 启动读事件监控; 3. 调用回调函数
assert(_statu == CONNECTING);//当前的状态必须一定是上层的半连接状态
_statu = CONNECTED;//当前函数执行完毕,则连接进入已完成连接状态
// 一旦启动读事件监控就有可能会立即触发读事件,如果这时候启动了非活跃连接销毁
_channel.EnableRead();
if (_connected_callback) _connected_callback(shared_from_this());
}
//这个接口才是实际的释放接口
void ReleaseInLoop() {
//1. 修改连接状态,将其置为DISCONNECTED
_statu = DISCONNECTED;
//2. 移除连接的事件监控
_channel.Remove();
//3. 关闭描述符
_socket.Close();
//4. 如果当前定时器队列中还有定时销毁任务,则取消任务
if (_loop->HasTimer(_conn_id)) CancelInactiveReleaseInLoop();
//5. 调用关闭回调函数,避免先移除服务器管理的连接信息导致Connection被释放,再去处理会出错,因此先调用用户的回调函数
if (_closed_callback) _closed_callback(shared_from_this());
//移除服务器内部管理的连接信息
if (_server_closed_callback) _server_closed_callback(shared_from_this());
}
//这个接口并不是实际的发送接口,而只是把数据放到了发送缓冲区,启动了可写事件监控
void SendInLoop(Buffer &buf) {
if (_statu == DISCONNECTED) return ;
_out_buffer.WriteBufferAndPush(buf);
if (_channel.WriteAble() == false) {
_channel.EnableWrite();
}
}
//这个关闭操作并非实际的连接释放操作,需要判断还有没有数据待处理,待发送
void ShutdownInLoop() {
_statu = DISCONNECTING;// 设置连接为半关闭状态
if (_in_buffer.ReadAbleSize() > 0) {
if (_message_callback) _message_callback(shared_from_this(), &_in_buffer);
}
//要么就是写入数据的时候出错关闭,要么就是没有待发送数据,直接关闭
if (_out_buffer.ReadAbleSize() > 0) {
if (_channel.WriteAble() == false) {
_channel.EnableWrite();
}
}
if (_out_buffer.ReadAbleSize() == 0) {
Release();
}
}
//启动非活跃连接超时释放规则
void EnableInactiveReleaseInLoop(int sec) {
//1. 将判断标志 _enable_inactive_release 置为true
_enable_inactive_release = true;
//2. 如果当前定时销毁任务已经存在,那就刷新延迟一下即可
if (_loop->HasTimer(_conn_id)) {
return _loop->TimerRefresh(_conn_id);
}
//3. 如果不存在定时销毁任务,则新增
_loop->TimerAdd(_conn_id, sec, std::bind(&Connection::Release, this));
}
void CancelInactiveReleaseInLoop() {
_enable_inactive_release = false;
if (_loop->HasTimer(_conn_id)) {
_loop->TimerCancel(_conn_id);
}
}
void UpgradeInLoop(const Any &context,
const ConnectedCallback &conn,
const MessageCallback &msg,
const ClosedCallback &closed,
const AnyEventCallback &event) {
_context = context;
_connected_callback = conn;
_message_callback = msg;
_closed_callback = closed;
_event_callback = event;
}
public:
Connection(EventLoop *loop, uint64_t conn_id, int sockfd):_conn_id(conn_id), _sockfd(sockfd),
_enable_inactive_release(false), _loop(loop), _statu(CONNECTING), _socket(_sockfd),
_channel(loop, _sockfd) {
_channel.SetCloseCallback(std::bind(&Connection::HandleClose, this));
_channel.SetEventCallback(std::bind(&Connection::HandleEvent, this));
_channel.SetReadCallback(std::bind(&Connection::HandleRead, this));
_channel.SetWriteCallback(std::bind(&Connection::HandleWrite, this));
_channel.SetErrorCallback(std::bind(&Connection::HandleError, this));
}
~Connection() { DBG_LOG("RELEASE CONNECTION:%p", this); }
//获取管理的文件描述符
int Fd() { return _sockfd; }
//获取连接ID
int Id() { return _conn_id; }
//是否处于CONNECTED状态
bool Connected() { return (_statu == CONNECTED); }
//设置上下文--连接建立完成时进行调用
void SetContext(const Any &context) { _context = context; }
//获取上下文,返回的是指针
Any *GetContext() { return &_context; }
void SetConnectedCallback(const ConnectedCallback&cb) { _connected_callback = cb; }
void SetMessageCallback(const MessageCallback&cb) { _message_callback = cb; }
void SetClosedCallback(const ClosedCallback&cb) { _closed_callback = cb; }
void SetAnyEventCallback(const AnyEventCallback&cb) { _event_callback = cb; }
void SetSrvClosedCallback(const ClosedCallback&cb) { _server_closed_callback = cb; }
//连接建立就绪后,进行channel回调设置,启动读监控,调用_connected_callback
void Established() {
_loop->RunInLoop(std::bind(&Connection::EstablishedInLoop, this));
}
//发送数据,将数据放到发送缓冲区,启动写事件监控
void Send(const char *data, size_t len) {
//外界传入的data,可能是个临时的空间,我们现在只是把发送操作压入了任务池,有可能并没有被立即执行
//因此有可能执行的时候,data指向的空间有可能已经被释放了。
Buffer buf;
buf.WriteAndPush(data, len);
_loop->RunInLoop(std::bind(&Connection::SendInLoop, this, std::move(buf)));
}
//提供给组件使用者的关闭接口--并不实际关闭,需要判断有没有数据待处理
void Shutdown() {
_loop->RunInLoop(std::bind(&Connection::ShutdownInLoop, this));
}
void Release() {
_loop->QueueInLoop(std::bind(&Connection::ReleaseInLoop, this));
}
//启动非活跃销毁,并定义多长时间无通信就是非活跃,添加定时任务
void EnableInactiveRelease(int sec) {
_loop->RunInLoop(std::bind(&Connection::EnableInactiveReleaseInLoop, this, sec));
}
//取消非活跃销毁
void CancelInactiveRelease() {
_loop->RunInLoop(std::bind(&Connection::CancelInactiveReleaseInLoop, this));
}
//切换协议---重置上下文以及阶段性回调处理函数 -- 而是这个接口必须在EventLoop线程中立即执行
//防备新的事件触发后,处理的时候,切换任务还没有被执行--会导致数据使用原协议处理了。
void Upgrade(const Any &context, const ConnectedCallback &conn, const MessageCallback &msg,
const ClosedCallback &closed, const AnyEventCallback &event) {
_loop->AssertInLoop();
_loop->RunInLoop(std::bind(&Connection::UpgradeInLoop, this, context, conn, msg, closed, event));
}
};
class Acceptor {
private:
Socket _socket;//用于创建监听套接字
EventLoop *_loop; //用于对监听套接字进行事件监控
Channel _channel; //用于对监听套接字进行事件管理
using AcceptCallback = std::function;
AcceptCallback _accept_callback;
private:
/*监听套接字的读事件回调处理函数---获取新连接,调用_accept_callback函数进行新连接处理*/
void HandleRead() {
int newfd = _socket.Accept();
if (newfd < 0) {
return ;
}
if (_accept_callback) _accept_callback(newfd);
}
int CreateServer(int port) {
bool ret = _socket.CreateServer(port);
assert(ret == true);
return _socket.Fd();
}
public:
/*不能将启动读事件监控,放到构造函数中,必须在设置回调函数后,再去启动*/
/*否则有可能造成启动监控后,立即有事件,处理的时候,回调函数还没设置:新连接得不到处理,且资源泄漏*/
Acceptor(EventLoop *loop, int port): _socket(CreateServer(port)), _loop(loop),
_channel(loop, _socket.Fd()) {
_channel.SetReadCallback(std::bind(&Acceptor::HandleRead, this));
}
void SetAcceptCallback(const AcceptCallback &cb) { _accept_callback = cb; }
void Listen() { _channel.EnableRead(); }
};
using TaskFunc = std::function;
using ReleaseFunc = std::function;
class TimerTask{
private:
uint64_t _id; // 定时器任务对象ID
uint32_t _timeout; //定时任务的超时时间
bool _canceled; // false-表示没有被取消, true-表示被取消
TaskFunc _task_cb; //定时器对象要执行的定时任务
ReleaseFunc _release; //用于删除TimerWheel中保存的定时器对象信息
public:
TimerTask(uint64_t id, uint32_t delay, const TaskFunc &cb):
_id(id), _timeout(delay), _task_cb(cb), _canceled(false) {}
~TimerTask() {
if (_canceled == false) _task_cb();
_release();
}
void Cancel() { _canceled = true; }
void SetRelease(const ReleaseFunc &cb) { _release = cb; }
uint32_t DelayTime() { return _timeout; }
};
class TimerWheel {
private:
using WeakTask = std::weak_ptr;
using PtrTask = std::shared_ptr;
int _tick; //当前的秒针,走到哪里释放哪里,释放哪里,就相当于执行哪里的任务
int _capacity; //表盘最大数量---其实就是最大延迟时间
std::vector> _wheel;
std::unordered_map _timers;
EventLoop *_loop;
int _timerfd;//定时器描述符--可读事件回调就是读取计数器,执行定时任务
std::unique_ptr _timer_channel;
private:
void RemoveTimer(uint64_t id) {
auto it = _timers.find(id);
if (it != _timers.end()) {
_timers.erase(it);
}
}
static int CreateTimerfd() {
int timerfd = timerfd_create(CLOCK_MONOTONIC, 0);
if (timerfd < 0) {
ERR_LOG("TIMERFD CREATE FAILED!");
abort();
}
//int timerfd_settime(int fd, int flags, struct itimerspec *new, struct itimerspec *old);
struct itimerspec itime;
itime.it_value.tv_sec = 1;
itime.it_value.tv_nsec = 0;//第一次超时时间为1s后
itime.it_interval.tv_sec = 1;
itime.it_interval.tv_nsec = 0; //第一次超时后,每次超时的间隔时
timerfd_settime(timerfd, 0, &itime, NULL);
return timerfd;
}
int ReadTimefd() {
uint64_t times;
//有可能因为其他描述符的事件处理花费事件比较长,然后在处理定时器描述符事件的时候,有可能就已经超时了很多次
//read读取到的数据times就是从上一次read之后超时的次数
int ret = read(_timerfd, ×, 8);
if (ret < 0) {
ERR_LOG("READ TIMEFD FAILED!");
abort();
}
return times;
}
//这个函数应该每秒钟被执行一次,相当于秒针向后走了一步
void RunTimerTask() {
_tick = (_tick + 1) % _capacity;
_wheel[_tick].clear();//清空指定位置的数组,就会把数组中保存的所有管理定时器对象的shared_ptr释放掉
}
void OnTime() {
//根据实际超时的次数,执行对应的超时任务
int times = ReadTimefd();
for (int i = 0; i < times; i++) {
RunTimerTask();
}
}
void TimerAddInLoop(uint64_t id, uint32_t delay, const TaskFunc &cb) {
PtrTask pt(new TimerTask(id, delay, cb));
pt->SetRelease(std::bind(&TimerWheel::RemoveTimer, this, id));
int pos = (_tick + delay) % _capacity;
_wheel[pos].push_back(pt);
_timers[id] = WeakTask(pt);
}
void TimerRefreshInLoop(uint64_t id) {
//通过保存的定时器对象的weak_ptr构造一个shared_ptr出来,添加到轮子中
auto it = _timers.find(id);
if (it == _timers.end()) {
return;//没找着定时任务,没法刷新,没法延迟
}
PtrTask pt = it->second.lock();//lock获取weak_ptr管理的对象对应的shared_ptr
int delay = pt->DelayTime();
int pos = (_tick + delay) % _capacity;
_wheel[pos].push_back(pt);
}
void TimerCancelInLoop(uint64_t id) {
auto it = _timers.find(id);
if (it == _timers.end()) {
return;//没找着定时任务,没法刷新,没法延迟
}
PtrTask pt = it->second.lock();
if (pt) pt->Cancel();
}
public:
TimerWheel(EventLoop *loop):_capacity(60), _tick(0), _wheel(_capacity), _loop(loop),
_timerfd(CreateTimerfd()), _timer_channel(new Channel(_loop, _timerfd)) {
_timer_channel->SetReadCallback(std::bind(&TimerWheel::OnTime, this));
_timer_channel->EnableRead();//启动读事件监控
}
/*定时器中有个_timers成员,定时器信息的操作有可能在多线程中进行,因此需要考虑线程安全问题*/
/*如果不想加锁,那就把对定期的所有操作,都放到一个线程中进行*/
void TimerAdd(uint64_t id, uint32_t delay, const TaskFunc &cb);
//刷新/延迟定时任务
void TimerRefresh(uint64_t id);
void TimerCancel(uint64_t id);
/*这个接口存在线程安全问题--这个接口实际上不能被外界使用者调用,只能在模块内,在对应的EventLoop线程内执行*/
bool HasTimer(uint64_t id) {
auto it = _timers.find(id);
if (it == _timers.end()) {
return false;
}
return true;
}
};
class Poller {
private:
int _epfd;
struct epoll_event _evs[MAX_EPOLLEVENTS];
std::unordered_map _channels;
private:
//对epoll的直接操作
void Update(Channel *channel, int op) {
// int epoll_ctl(int epfd, int op, int fd, struct epoll_event *ev);
int fd = channel->Fd();
struct epoll_event ev;
ev.data.fd = fd;
ev.events = channel->Events();
int ret = epoll_ctl(_epfd, op, fd, &ev);
if (ret < 0) {
ERR_LOG("EPOLLCTL FAILED!");
}
return;
}
//判断一个Channel是否已经添加了事件监控
bool HasChannel(Channel *channel) {
auto it = _channels.find(channel->Fd());
if (it == _channels.end()) {
return false;
}
return true;
}
public:
Poller() {
_epfd = epoll_create(MAX_EPOLLEVENTS);
if (_epfd < 0) {
ERR_LOG("EPOLL CREATE FAILED!!");
abort();//退出程序
}
}
//添加或修改监控事件
void UpdateEvent(Channel *channel) {
bool ret = HasChannel(channel);
if (ret == false) {
//不存在则添加
_channels.insert(std::make_pair(channel->Fd(), channel));
return Update(channel, EPOLL_CTL_ADD);
}
return Update(channel, EPOLL_CTL_MOD);
}
//移除监控
void RemoveEvent(Channel *channel) {
auto it = _channels.find(channel->Fd());
if (it != _channels.end()) {
_channels.erase(it);
}
Update(channel, EPOLL_CTL_DEL);
}
//开始监控,返回活跃连接
void Poll(std::vector *active) {
// int epoll_wait(int epfd, struct epoll_event *evs, int maxevents, int timeout)
int nfds = epoll_wait(_epfd, _evs, MAX_EPOLLEVENTS, -1);
if (nfds < 0) {
if (errno == EINTR) {
return ;
}
ERR_LOG("EPOLL WAIT ERROR:%s\n", strerror(errno));
abort();//退出程序
}
for (int i = 0; i < nfds; i++) {
auto it = _channels.find(_evs[i].data.fd);
assert(it != _channels.end());
it->second->SetREvents(_evs[i].events);//设置实际就绪的事件
active->push_back(it->second);
}
return;
}
};
class EventLoop {
private:
using Functor = std::function;
std::thread::id _thread_id;//线程ID
int _event_fd;//eventfd唤醒IO事件监控有可能导致的阻塞
std::unique_ptr _event_channel;
Poller _poller;//进行所有描述符的事件监控
std::vector _tasks;//任务池
std::mutex _mutex;//实现任务池操作的线程安全
TimerWheel _timer_wheel;//定时器模块
public:
//执行任务池中的所有任务
void RunAllTask() {
std::vector functor;
{
std::unique_lock _lock(_mutex);
_tasks.swap(functor);
}
for (auto &f : functor) {
f();
}
return ;
}
static int CreateEventFd() {
int efd = eventfd(0, EFD_CLOEXEC | EFD_NONBLOCK);
if (efd < 0) {
ERR_LOG("CREATE EVENTFD FAILED!!");
abort();//让程序异常退出
}
return efd;
}
void ReadEventfd() {
uint64_t res = 0;
int ret = read(_event_fd, &res, sizeof(res));
if (ret < 0) {
//EINTR -- 被信号打断; EAGAIN -- 表示无数据可读
if (errno == EINTR || errno == EAGAIN) {
return;
}
ERR_LOG("READ EVENTFD FAILED!");
abort();
}
return ;
}
void WeakUpEventFd() {
uint64_t val = 1;
int ret = write(_event_fd, &val, sizeof(val));
if (ret < 0) {
if (errno == EINTR) {
return;
}
ERR_LOG("READ EVENTFD FAILED!");
abort();
}
return ;
}
public:
EventLoop():_thread_id(std::this_thread::get_id()),
_event_fd(CreateEventFd()),
_event_channel(new Channel(this, _event_fd)),
_timer_wheel(this) {
//给eventfd添加可读事件回调函数,读取eventfd事件通知次数
_event_channel->SetReadCallback(std::bind(&EventLoop::ReadEventfd, this));
//启动eventfd的读事件监控
_event_channel->EnableRead();
}
//三步走--事件监控-》就绪事件处理-》执行任务
void Start() {
while(1) {
//1. 事件监控,
std::vector actives;
_poller.Poll(&actives);
//2. 事件处理。
for (auto &channel : actives) {
channel->HandleEvent();
}
//3. 执行任务
RunAllTask();
}
}
//用于判断当前线程是否是EventLoop对应的线程;
bool IsInLoop() {
return (_thread_id == std::this_thread::get_id());
}
void AssertInLoop() {
assert(_thread_id == std::this_thread::get_id());
}
//判断将要执行的任务是否处于当前线程中,如果是则执行,不是则压入队列。
void RunInLoop(const Functor &cb) {
if (IsInLoop()) {
return cb();
}
return QueueInLoop(cb);
}
//将操作压入任务池
void QueueInLoop(const Functor &cb) {
{
std::unique_lock _lock(_mutex);
_tasks.push_back(cb);
}
//唤醒有可能因为没有事件就绪,而导致的epoll阻塞;
//其实就是给eventfd写入一个数据,eventfd就会触发可读事件
WeakUpEventFd();
}
//添加/修改描述符的事件监控
void UpdateEvent(Channel *channel) { return _poller.UpdateEvent(channel); }
//移除描述符的监控
void RemoveEvent(Channel *channel) { return _poller.RemoveEvent(channel); }
void TimerAdd(uint64_t id, uint32_t delay, const TaskFunc &cb) { return _timer_wheel.TimerAdd(id, delay, cb); }
void TimerRefresh(uint64_t id) { return _timer_wheel.TimerRefresh(id); }
void TimerCancel(uint64_t id) { return _timer_wheel.TimerCancel(id); }
bool HasTimer(uint64_t id) { return _timer_wheel.HasTimer(id); }
};
class TcpServer {
private:
uint64_t _next_id; //这是一个自动增长的连接ID,
int _port;
int _timeout; //这是非活跃连接的统计时间---多长时间无通信就是非活跃连接
bool _enable_inactive_release;//是否启动了非活跃连接超时销毁的判断标志
EventLoop _baseloop; //这是主线程的EventLoop对象,负责监听事件的处理
Acceptor _acceptor; //这是监听套接字的管理对象
LoopThreadPool _pool; //这是从属EventLoop线程池
std::unordered_map _conns;//保存管理所有连接对应的shared_ptr对象
using ConnectedCallback = std::function;
using MessageCallback = std::function;
using ClosedCallback = std::function;
using AnyEventCallback = std::function;
using Functor = std::function;
ConnectedCallback _connected_callback;
MessageCallback _message_callback;
ClosedCallback _closed_callback;
AnyEventCallback _event_callback;
private:
void RunAfterInLoop(const Functor &task, int delay) {
_next_id++;
_baseloop.TimerAdd(_next_id, delay, task);
}
//为新连接构造一个Connection进行管理
void NewConnection(int fd) {
_next_id++;
PtrConnection conn(new Connection(_pool.NextLoop(), _next_id, fd));
conn->SetMessageCallback(_message_callback);
conn->SetClosedCallback(_closed_callback);
conn->SetConnectedCallback(_connected_callback);
conn->SetAnyEventCallback(_event_callback);
conn->SetSrvClosedCallback(std::bind(&TcpServer::RemoveConnection, this, std::placeholders::_1));
if (_enable_inactive_release) conn->EnableInactiveRelease(_timeout);//启动非活跃超时销毁
conn->Established();//就绪初始化
_conns.insert(std::make_pair(_next_id, conn));
}
void RemoveConnectionInLoop(const PtrConnection &conn) {
int id = conn->Id();
auto it = _conns.find(id);
if (it != _conns.end()) {
_conns.erase(it);
}
}
//从管理Connection的_conns中移除连接信息
void RemoveConnection(const PtrConnection &conn) {
_baseloop.RunInLoop(std::bind(&TcpServer::RemoveConnectionInLoop, this, conn));
}
public:
TcpServer(int port):
_port(port),
_next_id(0),
_enable_inactive_release(false),
_acceptor(&_baseloop, port),
_pool(&_baseloop) {
_acceptor.SetAcceptCallback(std::bind(&TcpServer::NewConnection, this, std::placeholders::_1));
_acceptor.Listen();//将监听套接字挂到baseloop上
}
void SetThreadCount(int count) { return _pool.SetThreadCount(count); }
void SetConnectedCallback(const ConnectedCallback&cb) { _connected_callback = cb; }
void SetMessageCallback(const MessageCallback&cb) { _message_callback = cb; }
void SetClosedCallback(const ClosedCallback&cb) { _closed_callback = cb; }
void SetAnyEventCallback(const AnyEventCallback&cb) { _event_callback = cb; }
void EnableInactiveRelease(int timeout) { _timeout = timeout; _enable_inactive_release = true; }
//用于添加一个定时任务
void RunAfter(const Functor &task, int delay) {
_baseloop.RunInLoop(std::bind(&TcpServer::RunAfterInLoop, this, task, delay));
}
void Start() { _pool.Create(); _baseloop.Start(); }
};
void Channel::Remove() { return _loop->RemoveEvent(this); }
void Channel::Update() { return _loop->UpdateEvent(this); }
void TimerWheel::TimerAdd(uint64_t id, uint32_t delay, const TaskFunc &cb) {
_loop->RunInLoop(std::bind(&TimerWheel::TimerAddInLoop, this, id, delay, cb));
}
//刷新/延迟定时任务
void TimerWheel::TimerRefresh(uint64_t id) {
_loop->RunInLoop(std::bind(&TimerWheel::TimerRefreshInLoop, this, id));
}
void TimerWheel::TimerCancel(uint64_t id) {
_loop->RunInLoop(std::bind(&TimerWheel::TimerCancelInLoop, this, id));
}
class NetWork {
public:
NetWork() {
DBG_LOG("SIGPIPE INIT");
signal(SIGPIPE, SIG_IGN);
}
};
std::unordered_map _statu_msg = {
{100, "Continue"},
{101, "Switching Protocol"},
{102, "Processing"},
{103, "Early Hints"},
{200, "OK"},
{201, "Created"},
{202, "Accepted"},
{203, "Non-Authoritative Information"},
{204, "No Content"},
{205, "Reset Content"},
{206, "Partial Content"},
{207, "Multi-Status"},
{208, "Already Reported"},
{226, "IM Used"},
{300, "Multiple Choice"},
{301, "Moved Permanently"},
{302, "Found"},
{303, "See Other"},
{304, "Not Modified"},
{305, "Use Proxy"},
{306, "unused"},
{307, "Temporary Redirect"},
{308, "Permanent Redirect"},
{400, "Bad Request"},
{401, "Unauthorized"},
{402, "Payment Required"},
{403, "Forbidden"},
{404, "Not Found"},
{405, "Method Not Allowed"},
{406, "Not Acceptable"},
{407, "Proxy Authentication Required"},
{408, "Request Timeout"},
{409, "Conflict"},
{410, "Gone"},
{411, "Length Required"},
{412, "Precondition Failed"},
{413, "Payload Too Large"},
{414, "URI Too Long"},
{415, "Unsupported Media Type"},
{416, "Range Not Satisfiable"},
{417, "Expectation Failed"},
{418, "I'm a teapot"},
{421, "Misdirected Request"},
{422, "Unprocessable Entity"},
{423, "Locked"},
{424, "Failed Dependency"},
{425, "Too Early"},
{426, "Upgrade Required"},
{428, "Precondition Required"},
{429, "Too Many Requests"},
{431, "Request Header Fields Too Large"},
{451, "Unavailable For Legal Reasons"},
{501, "Not Implemented"},
{502, "Bad Gateway"},
{503, "Service Unavailable"},
{504, "Gateway Timeout"},
{505, "HTTP Version Not Supported"},
{506, "Variant Also Negotiates"},
{507, "Insufficient Storage"},
{508, "Loop Detected"},
{510, "Not Extended"},
{511, "Network Authentication Required"}
};
std::unordered_map _mime_msg = {
{".aac", "audio/aac"},
{".abw", "application/x-abiword"},
{".arc", "application/x-freearc"},
{".avi", "video/x-msvideo"},
{".azw", "application/vnd.amazon.ebook"},
{".bin", "application/octet-stream"},
{".bmp", "image/bmp"},
{".bz", "application/x-bzip"},
{".bz2", "application/x-bzip2"},
{".csh", "application/x-csh"},
{".css", "text/css"},
{".csv", "text/csv"},
{".doc", "application/msword"},
{".docx", "application/vnd.openxmlformats-officedocument.wordprocessingml.document"},
{".eot", "application/vnd.ms-fontobject"},
{".epub", "application/epub+zip"},
{".gif", "image/gif"},
{".htm", "text/html"},
{".html", "text/html"},
{".ico", "image/vnd.microsoft.icon"},
{".ics", "text/calendar"},
{".jar", "application/java-archive"},
{".jpeg", "image/jpeg"},
{".jpg", "image/jpeg"},
{".js", "text/javascript"},
{".json", "application/json"},
{".jsonld", "application/ld+json"},
{".mid", "audio/midi"},
{".midi", "audio/x-midi"},
{".mjs", "text/javascript"},
{".mp3", "audio/mpeg"},
{".mpeg", "video/mpeg"},
{".mpkg", "application/vnd.apple.installer+xml"},
{".odp", "application/vnd.oasis.opendocument.presentation"},
{".ods", "application/vnd.oasis.opendocument.spreadsheet"},
{".odt", "application/vnd.oasis.opendocument.text"},
{".oga", "audio/ogg"},
{".ogv", "video/ogg"},
{".ogx", "application/ogg"},
{".otf", "font/otf"},
{".png", "image/png"},
{".pdf", "application/pdf"},
{".ppt", "application/vnd.ms-powerpoint"},
{".pptx", "application/vnd.openxmlformats-officedocument.presentationml.presentation"},
{".rar", "application/x-rar-compressed"},
{".rtf", "application/rtf"},
{".sh", "application/x-sh"},
{".svg", "image/svg+xml"},
{".swf", "application/x-shockwave-flash"},
{".tar", "application/x-tar"},
{".tif", "image/tiff"},
{".tiff", "image/tiff"},
{".ttf", "font/ttf"},
{".txt", "text/plain"},
{".vsd", "application/vnd.visio"},
{".wav", "audio/wav"},
{".weba", "audio/webm"},
{".webm", "video/webm"},
{".webp", "image/webp"},
{".woff", "font/woff"},
{".woff2", "font/woff2"},
{".xhtml", "application/xhtml+xml"},
{".xls", "application/vnd.ms-excel"},
{".xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet"},
{".xml", "application/xml"},
{".xul", "application/vnd.mozilla.xul+xml"},
{".zip", "application/zip"},
{".3gp", "video/3gpp"},
{".3g2", "video/3gpp2"},
{".7z", "application/x-7z-compressed"}
};
class Util {
public:
//字符串分割函数,将src字符串按照sep字符进行分割,得到的各个字串放到arry中,最终返回字串的数量
static size_t Split(const std::string &src, const std::string &sep, std::vector *arry) {
size_t offset = 0;
// 有10个字符,offset是查找的起始位置,范围应该是0~9,offset==10就代表已经越界了
while(offset < src.size()) {
size_t pos = src.find(sep, offset);//在src字符串偏移量offset处,开始向后查找sep字符/字串,返回查找到的位置
if (pos == std::string::npos) {//没有找到特定的字符
//将剩余的部分当作一个字串,放入arry中
if(pos == src.size()) break;
arry->push_back(src.substr(offset));
return arry->size();
}
if (pos == offset) {
offset = pos + sep.size();
continue;//当前字串是一个空的,没有内容
}
arry->push_back(src.substr(offset, pos - offset));
offset = pos + sep.size();
}
return arry->size();
}
//读取文件的所有内容,将读取的内容放到一个Buffer中
static bool ReadFile(const std::string &filename, std::string *buf) {
std::ifstream ifs(filename, std::ios::binary);
if (ifs.is_open() == false) {
printf("OPEN %s FILE FAILED!!", filename.c_str());
return false;
}
size_t fsize = 0;
ifs.seekg(0, ifs.end);//跳转读写位置到末尾
fsize = ifs.tellg(); //获取当前读写位置相对于起始位置的偏移量,从末尾偏移刚好就是文件大小
ifs.seekg(0, ifs.beg);//跳转到起始位置
buf->resize(fsize); //开辟文件大小的空间
ifs.read(&(*buf)[0], fsize);
if (ifs.good() == false) {
printf("READ %s FILE FAILED!!", filename.c_str());
ifs.close();
return false;
}
ifs.close();
return true;
}
//向文件写入数据
static bool WriteFile(const std::string &filename, const std::string &buf) {
std::ofstream ofs(filename, std::ios::binary | std::ios::trunc);
if (ofs.is_open() == false) {
printf("OPEN %s FILE FAILED!!", filename.c_str());
return false;
}
ofs.write(buf.c_str(), buf.size());
if (ofs.good() == false) {
ERR_LOG("WRITE %s FILE FAILED!", filename.c_str());
ofs.close();
return false;
}
ofs.close();
return true;
}
//URL编码,避免URL中资源路径与查询字符串中的特殊字符与HTTP请求中特殊字符产生歧义
//编码格式:将特殊字符的ascii值,转换为两个16进制字符,前缀% C++ -> C%2B%2B
// 不编码的特殊字符: RFC3986文档规定 . - _ ~ 字母,数字属于绝对不编码字符
//RFC3986文档规定,编码格式 %HH
//W3C标准中规定,查询字符串中的空格,需要编码为+, 解码则是+转空格
static std::string UrlEncode(const std::string url, bool convert_space_to_plus) {
std::string res;
for (auto &c : url) {
if (c == '.' || c == '-' || c == '_' || c == '~' || isalnum(c)) {
res += c;
continue;
}
if (c == ' ' && convert_space_to_plus == true) {
res += '+';
continue;
}
//剩下的字符都是需要编码成为 %HH 格式
char tmp[4] = {0};
//snprintf 与 printf比较类似,都是格式化字符串,只不过一个是打印,一个是放到一块空间中
snprintf(tmp, 4, "%%%02X", c);
res += tmp;
}
return res;
}
static char HEXTOI(char c) {
if (c >= '0' && c <= '9') {
return c - '0';
}else if (c >= 'a' && c <= 'z') {
return c - 'a' + 10;
}else if (c >= 'A' && c <= 'Z') {
return c - 'A' + 10;
}
return -1;
}
static std::string UrlDecode(const std::string url, bool convert_plus_to_space) {
//遇到了%,则将紧随其后的2个字符,转换为数字,第一个数字左移4位,然后加上第二个数字 + -> 2b %2b->2 << 4 + 11
std::string res;
for (int i = 0; i < url.size(); i++) {
if (url[i] == '+' && convert_plus_to_space == true) {
res += ' ';
continue;
}
if (url[i] == '%' && (i + 2) < url.size()) {
char v1 = HEXTOI(url[i + 1]);
char v2 = HEXTOI(url[i + 2]);
char v = v1 * 16 + v2;
res += v;
i += 2;
continue;
}
res += url[i];
}
return res;
}
//响应状态码的描述信息获取
static std::string StatuDesc(int statu) {
auto it = _statu_msg.find(statu);
if (it != _statu_msg.end()) {
return it->second;
}
return "Unknow";
}
//根据文件后缀名获取文件mime
static std::string ExtMime(const std::string &filename) {
// a.b.txt 先获取文件扩展名
size_t pos = filename.find_last_of('.');
if (pos == std::string::npos) {
return "application/octet-stream";
}
//根据扩展名,获取mime
std::string ext = filename.substr(pos);
auto it = _mime_msg.find(ext);
if (it == _mime_msg.end()) {
return "application/octet-stream";
}
return it->second;
}
//判断一个文件是否是一个目录
static bool IsDirectory(const std::string &filename) {
struct stat st;
int ret = stat(filename.c_str(), &st);
if (ret < 0) {
return false;
}
return S_ISDIR(st.st_mode);
}
//判断一个文件是否是一个普通文件
static bool IsRegular(const std::string &filename) {
struct stat st;
int ret = stat(filename.c_str(), &st);
if (ret < 0) {
return false;
}
return S_ISREG(st.st_mode);
}
//http请求的资源路径有效性判断
// /index.html --- 前边的/叫做相对根目录 映射的是某个服务器上的子目录
// 想表达的意思就是,客户端只能请求相对根目录中的资源,其他地方的资源都不予理会
// /../login, 这个路径中的..会让路径的查找跑到相对根目录之外,这是不合理的,不安全的
static bool ValidPath(const std::string &path) {
//思想:按照/进行路径分割,根据有多少子目录,计算目录深度,有多少层,深度不能小于0
std::vector subdir;
Split(path, "/", &subdir);
int level = 0;
for (auto &dir : subdir) {
if (dir == "..") {
level--; //任意一层走出相对根目录,就认为有问题
if (level < 0) return false;
continue;
}
level++;
}
return true;
}
};
class HttpRequest {
public:
std::string _method; //请求方法
std::string _path; //资源路径
std::string _version; //协议版本
std::string _body; //请求正文
std::smatch _matches; //资源路径的正则提取数据
std::unordered_map _headers; //头部字段
std::unordered_map _params; //查询字符串
public:
HttpRequest():_version("HTTP/1.1") {}
void ReSet() {
_method.clear();
_path.clear();
_version = "HTTP/1.1";
_body.clear();
std::smatch match;
_matches.swap(match);
_headers.clear();
_params.clear();
}
//插入头部字段
void SetHeader(const std::string &key, const std::string &val) {
_headers.insert(std::make_pair(key, val));
}
//判断是否存在指定头部字段
bool HasHeader(const std::string &key) const {
auto it = _headers.find(key);
if (it == _headers.end()) {
return false;
}
return true;
}
//获取指定头部字段的值
std::string GetHeader(const std::string &key) const {
auto it = _headers.find(key);
if (it == _headers.end()) {
return "";
}
return it->second;
}
//插入查询字符串
void SetParam(const std::string &key, const std::string &val) {
_params.insert(std::make_pair(key, val));
}
//判断是否有某个指定的查询字符串
bool HasParam(const std::string &key) const {
auto it = _params.find(key);
if (it == _params.end()) {
return false;
}
return true;
}
//获取指定的查询字符串
std::string GetParam(const std::string &key) const {
auto it = _params.find(key);
if (it == _params.end()) {
return "";
}
return it->second;
}
//获取正文长度
size_t ContentLength() const {
// Content-Length: 1234\r\n
bool ret = HasHeader("Content-Length");
if (ret == false) {
return 0;
}
std::string clen = GetHeader("Content-Length");
return std::stol(clen);
}
//判断是否是短链接
bool Close() const {
// 没有Connection字段,或者有Connection但是值是close,则都是短链接,否则就是长连接
if (HasHeader("Connection") == true && GetHeader("Connection") == "keep-alive") {
return false;
}
return true;
}
};
class HttpContext {
private:
int _resp_statu; //响应状态码
HttpRecvStatu _recv_statu; //当前接收及解析的阶段状态
HttpRequest _request; //已经解析得到的请求信息
private:
bool ParseHttpLine(const std::string &line) {
std::smatch matches;
std::regex e("(GET|HEAD|POST|PUT|DELETE) ([^?]*)(?:\\?(.*))? (HTTP/1\\.[01])(?:\n|\r\n)?", std::regex::icase);
bool ret = std::regex_match(line, matches, e);
if (ret == false) {
_recv_statu = RECV_HTTP_ERROR;
_resp_statu = 400;//BAD REQUEST
return false;
}
//0 : GET /bitejiuyeke/login?user=xiaoming&pass=123123 HTTP/1.1
//1 : GET
//2 : /bitejiuyeke/login
//3 : user=xiaoming&pass=123123
//4 : HTTP/1.1
//请求方法的获取
_request._method = matches[1];
std::transform(_request._method.begin(), _request._method.end(), _request._method.begin(), ::toupper);
//资源路径的获取,需要进行URL解码操作,但是不需要+转空格
_request._path = Util::UrlDecode(matches[2], false);
//协议版本的获取
_request._version = matches[4];
//查询字符串的获取与处理
std::vector query_string_arry;
std::string query_string = matches[3];
//查询字符串的格式 key=val&key=val....., 先以 & 符号进行分割,得到各个字串
Util::Split(query_string, "&", &query_string_arry);
//针对各个字串,以 = 符号进行分割,得到key 和val, 得到之后也需要进行URL解码
for (auto &str : query_string_arry) {
size_t pos = str.find("=");
if (pos == std::string::npos) {
_recv_statu = RECV_HTTP_ERROR;
_resp_statu = 400;//BAD REQUEST
return false;
}
std::string key = Util::UrlDecode(str.substr(0, pos), true);
std::string val = Util::UrlDecode(str.substr(pos + 1), true);
_request.SetParam(key, val);
}
return true;
}
bool RecvHttpLine(Buffer *buf) {
if (_recv_statu != RECV_HTTP_LINE) return false;
//1. 获取一行数据,带有末尾的换行
std::string line = buf->GetLineAndPop();
//2. 需要考虑的一些要素:缓冲区中的数据不足一行, 获取的一行数据超大
if (line.size() == 0) {
//缓冲区中的数据不足一行,则需要判断缓冲区的可读数据长度,如果很长了都不足一行,这是有问题的
if (buf->ReadAbleSize() > MAX_LINE) {
_recv_statu = RECV_HTTP_ERROR;
_resp_statu = 414;//URI TOO LONG
return false;
}
//缓冲区中数据不足一行,但是也不多,就等等新数据的到来
return true;
}
if (line.size() > MAX_LINE) {
_recv_statu = RECV_HTTP_ERROR;
_resp_statu = 414;//URI TOO LONG
return false;
}
bool ret = ParseHttpLine(line);
if (ret == false) {
return false;
}
//首行处理完毕,进入头部获取阶段
_recv_statu = RECV_HTTP_HEAD;
return true;
}
bool RecvHttpHead(Buffer *buf) {
if (_recv_statu != RECV_HTTP_HEAD) return false;
//一行一行取出数据,直到遇到空行为止, 头部的格式 key: val\r\nkey: val\r\n....
while(1){
std::string line = buf->GetLineAndPop();
//2. 需要考虑的一些要素:缓冲区中的数据不足一行, 获取的一行数据超大
if (line.size() == 0) {
//缓冲区中的数据不足一行,则需要判断缓冲区的可读数据长度,如果很长了都不足一行,这是有问题的
if (buf->ReadAbleSize() > MAX_LINE) {
_recv_statu = RECV_HTTP_ERROR;
_resp_statu = 414;//URI TOO LONG
return false;
}
//缓冲区中数据不足一行,但是也不多,就等等新数据的到来
return true;
}
if (line.size() > MAX_LINE) {
_recv_statu = RECV_HTTP_ERROR;
_resp_statu = 414;//URI TOO LONG
return false;
}
if (line == "\n" || line == "\r\n") {
break;
}
bool ret = ParseHttpHead(line);
if (ret == false) {
return false;
}
}
//头部处理完毕,进入正文获取阶段
_recv_statu = RECV_HTTP_BODY;
return true;
}
bool ParseHttpHead(std::string &line) {
//key: val\r\nkey: val\r\n....
if (line.back() == '\n') line.pop_back();//末尾是换行则去掉换行字符
if (line.back() == '\r') line.pop_back();//末尾是回车则去掉回车字符
size_t pos = line.find(": ");
if (pos == std::string::npos) {
_recv_statu = RECV_HTTP_ERROR;
_resp_statu = 400;//
return false;
}
std::string key = line.substr(0, pos);
std::string val = line.substr(pos + 2);
_request.SetHeader(key, val);
return true;
}
bool RecvHttpBody(Buffer *buf) {
if (_recv_statu != RECV_HTTP_BODY) return false;
//1. 获取正文长度
size_t content_length = _request.ContentLength();
if (content_length == 0) {
//没有正文,则请求接收解析完毕
_recv_statu = RECV_HTTP_OVER;
return true;
}
//2. 当前已经接收了多少正文,其实就是往 _request._body 中放了多少数据了
size_t real_len = content_length - _request._body.size();//实际还需要接收的正文长度
//3. 接收正文放到body中,但是也要考虑当前缓冲区中的数据,是否是全部的正文
// 3.1 缓冲区中数据,包含了当前请求的所有正文,则取出所需的数据
if (buf->ReadAbleSize() >= real_len) {
_request._body.append(buf->ReadPosition(), real_len);
buf->MoveReadOffset(real_len);
_recv_statu = RECV_HTTP_OVER;
return true;
}
// 3.2 缓冲区中数据,无法满足当前正文的需要,数据不足,取出数据,然后等待新数据到来
_request._body.append(buf->ReadPosition(), buf->ReadAbleSize());
buf->MoveReadOffset(buf->ReadAbleSize());
return true;
}
public:
HttpContext():_resp_statu(200), _recv_statu(RECV_HTTP_LINE) {}
void ReSet() {
_resp_statu = 200;
_recv_statu = RECV_HTTP_LINE;
_request.ReSet();
}
int RespStatu() { return _resp_statu; }
HttpRecvStatu RecvStatu() { return _recv_statu; }
HttpRequest &Request() { return _request; }
//接收并解析HTTP请求
void RecvHttpRequest(Buffer *buf) {
//不同的状态,做不同的事情,但是这里不要break, 因为处理完请求行后,应该立即处理头部,而不是退出等新数据
switch(_recv_statu) {
case RECV_HTTP_LINE: RecvHttpLine(buf);
case RECV_HTTP_HEAD: RecvHttpHead(buf);
case RECV_HTTP_BODY: RecvHttpBody(buf);
}
return;
}
};
class HttpServer {
private:
using Handler = std::function;
using Handlers = std::vector>;
Handlers _get_route;
Handlers _post_route;
Handlers _put_route;
Handlers _delete_route;
std::string _basedir; //静态资源根目录
TcpServer _server;
private:
void ErrorHandler(const HttpRequest &req, HttpResponse *rsp) {
//1. 组织一个错误展示页面
std::string body;
body += "";
body += "";
body += "";
body += "";
body += "";
body += "";
body += std::to_string(rsp->_statu);
body += " ";
body += Util::StatuDesc(rsp->_statu);
body += "
";
body += "";
body += "";
//2. 将页面数据,当作响应正文,放入rsp中
rsp->SetContent(body, "text/html");
}
//将HttpResponse中的要素按照http协议格式进行组织,发送
void WriteReponse(const PtrConnection &conn, const HttpRequest &req, HttpResponse &rsp) {
//1. 先完善头部字段
if (req.Close() == true) {
rsp.SetHeader("Connection", "close");
}else {
rsp.SetHeader("Connection", "keep-alive");
}
if (rsp._body.empty() == false && rsp.HasHeader("Content-Length") == false) {
rsp.SetHeader("Content-Length", std::to_string(rsp._body.size()));
}
if (rsp._body.empty() == false && rsp.HasHeader("Content-Type") == false) {
rsp.SetHeader("Content-Type", "application/octet-stream");
}
if (rsp._redirect_flag == true) {
rsp.SetHeader("Location", rsp._redirect_url);
}
//2. 将rsp中的要素,按照http协议格式进行组织
std::stringstream rsp_str;
rsp_str << req._version << " " << std::to_string(rsp._statu) << " " << Util::StatuDesc(rsp._statu) << "\r\n";
for (auto &head : rsp._headers) {
rsp_str << head.first << ": " << head.second << "\r\n";
}
rsp_str << "\r\n";
rsp_str << rsp._body;
//3. 发送数据
conn->Send(rsp_str.str().c_str(), rsp_str.str().size());
}
bool IsFileHandler(const HttpRequest &req) {
// 1. 必须设置了静态资源根目录
if (_basedir.empty()) {
return false;
}
// 2. 请求方法,必须是GET / HEAD请求方法
if (req._method != "GET" && req._method != "HEAD") {
return false;
}
// 3. 请求的资源路径必须是一个合法路径
if (Util::ValidPath(req._path) == false) {
return false;
}
// 4. 请求的资源必须存在,且是一个普通文件
// 有一种请求比较特殊 -- 目录:/, /image/, 这种情况给后边默认追加一个 index.html
// index.html /image/a.png
// 不要忘了前缀的相对根目录,也就是将请求路径转换为实际存在的路径 /image/a.png -> ./wwwroot/image/a.png
std::string req_path = _basedir + req._path;//为了避免直接修改请求的资源路径,因此定义一个临时对象
if (req._path.back() == '/') {
req_path += "index.html";
}
if (Util::IsRegular(req_path) == false) {
return false;
}
return true;
}
//静态资源的请求处理 --- 将静态资源文件的数据读取出来,放到rsp的_body中, 并设置mime
void FileHandler(const HttpRequest &req, HttpResponse *rsp) {
std::string req_path = _basedir + req._path;
if (req._path.back() == '/') {
req_path += "index.html";
}
bool ret = Util::ReadFile(req_path, &rsp->_body);
if (ret == false) {
return;
}
std::string mime = Util::ExtMime(req_path);
rsp->SetHeader("Content-Type", mime);
return;
}
//功能性请求的分类处理
void Dispatcher(HttpRequest &req, HttpResponse *rsp, Handlers &handlers) {
//在对应请求方法的路由表中,查找是否含有对应资源请求的处理函数,有则调用,没有则发挥404
//思想:路由表存储的时键值对 -- 正则表达式 & 处理函数
//使用正则表达式,对请求的资源路径进行正则匹配,匹配成功就使用对应函数进行处理
// /numbers/(\d+) /numbers/12345
for (auto &handler : handlers) {
const std::regex &re = handler.first;
const Handler &functor = handler.second;
bool ret = std::regex_match(req._path, req._matches, re);
if (ret == false) {
continue;
}
return functor(req, rsp);//传入请求信息,和空的rsp,执行处理函数
}
rsp->_statu = 404;
}
void Route(HttpRequest &req, HttpResponse *rsp) {
//1. 对请求进行分辨,是一个静态资源请求,还是一个功能性请求
// 静态资源请求,则进行静态资源的处理
// 功能性请求,则需要通过几个请求路由表来确定是否有处理函数
// 既不是静态资源请求,也没有设置对应的功能性请求处理函数,就返回405
if (IsFileHandler(req) == true) {
//是一个静态资源请求, 则进行静态资源请求的处理
return FileHandler(req, rsp);
}
if (req._method == "GET" || req._method == "HEAD") {
return Dispatcher(req, rsp, _get_route);
}else if (req._method == "POST") {
return Dispatcher(req, rsp, _post_route);
}else if (req._method == "PUT") {
return Dispatcher(req, rsp, _put_route);
}else if (req._method == "DELETE") {
return Dispatcher(req, rsp, _delete_route);
}
rsp->_statu = 405;// Method Not Allowed
return ;
}
//设置上下文
void OnConnected(const PtrConnection &conn) {
conn->SetContext(HttpContext());
DBG_LOG("NEW CONNECTION %p", conn.get());
}
//缓冲区数据解析+处理
void OnMessage(const PtrConnection &conn, Buffer *buffer) {
while(buffer->ReadAbleSize() > 0){
//1. 获取上下文
HttpContext *context = conn->GetContext()->get();
//2. 通过上下文对缓冲区数据进行解析,得到HttpRequest对象
// 1. 如果缓冲区的数据解析出错,就直接回复出错响应
// 2. 如果解析正常,且请求已经获取完毕,才开始去进行处理
context->RecvHttpRequest(buffer);
HttpRequest &req = context->Request();
HttpResponse rsp(context->RespStatu());
if (context->RespStatu() >= 400) {
//进行错误响应,关闭连接
ErrorHandler(req, &rsp);//填充一个错误显示页面数据到rsp中
WriteReponse(conn, req, rsp);//组织响应发送给客户端
context->ReSet();
buffer->MoveReadOffset(buffer->ReadAbleSize());//出错了就把缓冲区数据清空
conn->Shutdown();//关闭连接
return;
}
if (context->RecvStatu() != RECV_HTTP_OVER) {
//当前请求还没有接收完整,则退出,等新数据到来再重新继续处理
return;
}
//3. 请求路由 + 业务处理
Route(req, &rsp);
//4. 对HttpResponse进行组织发送
WriteReponse(conn, req, rsp);
//5. 重置上下文
context->ReSet();
//6. 根据长短连接判断是否关闭连接或者继续处理
if (rsp.Close() == true) conn->Shutdown();//短链接则直接关闭
}
return;
}
public:
HttpServer(int port, int timeout = DEFALT_TIMEOUT):_server(port) {
_server.EnableInactiveRelease(timeout);
_server.SetConnectedCallback(std::bind(&HttpServer::OnConnected, this, std::placeholders::_1));
_server.SetMessageCallback(std::bind(&HttpServer::OnMessage, this, std::placeholders::_1, std::placeholders::_2));
}
void SetBaseDir(const std::string &path) {
assert(Util::IsDirectory(path) == true);
_basedir = path;
}
/*设置/添加,请求(请求的正则表达)与处理函数的映射关系*/
void Get(const std::string &pattern, const Handler &handler) {
_get_route.push_back(std::make_pair(std::regex(pattern), handler));
}
void Post(const std::string &pattern, const Handler &handler) {
_post_route.push_back(std::make_pair(std::regex(pattern), handler));
}
void Put(const std::string &pattern, const Handler &handler) {
_put_route.push_back(std::make_pair(std::regex(pattern), handler));
}
void Delete(const std::string &pattern, const Handler &handler) {
_delete_route.push_back(std::make_pair(std::regex(pattern), handler));
}
void SetThreadCount(int count) {
_server.SetThreadCount(count);
}
void Listen() {
_server.Start();
}
};