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Mini Shell
Mini Shell
/*
+----------------------------------------------------------------------+
| Swoole |
+----------------------------------------------------------------------+
| This source file is subject to version 2.0 of the Apache license, |
| that is bundled with this package in the file LICENSE, and is |
| available through the world-wide-web at the following url: |
| http://www.apache.org/licenses/LICENSE-2.0.html |
| If you did not receive a copy of the Apache2.0 license and are unable|
| to obtain it through the world-wide-web, please send a note to |
| license@swoole.com so we can mail you a copy immediately. |
+----------------------------------------------------------------------+
| Author: Tianfeng Han <rango@swoole.com> |
| Twosee <twose@qq.com> |
+----------------------------------------------------------------------+
*/
#pragma once
#include "swoole.h"
#include "swoole_socket.h"
#include <list>
#include <map>
#include <unordered_map>
namespace swoole {
struct DeferCallback {
Callback callback;
void *data;
};
class Reactor;
class ReactorImpl {
protected:
Reactor *reactor_;
public:
ReactorImpl(Reactor *_reactor) {
reactor_ = _reactor;
}
void after_removal_failure(network::Socket *_socket);
virtual ~ReactorImpl(){};
virtual bool ready() = 0;
virtual int add(network::Socket *socket, int events) = 0;
virtual int set(network::Socket *socket, int events) = 0;
virtual int del(network::Socket *socket) = 0;
virtual int wait(struct timeval *) = 0;
};
class CallbackManager {
public:
typedef std::list<std::pair<Callback, void *>> TaskList;
void append(Callback fn, void *private_data) {
list_.emplace_back(fn, private_data);
}
void prepend(Callback fn, void *private_data) {
list_.emplace_front(fn, private_data);
auto t = list_.back();
}
void remove(TaskList::iterator iter) {
list_.erase(iter);
}
void execute() {
while (!list_.empty()) {
std::pair<Callback, void *> task = list_.front();
list_.pop_front();
task.first(task.second);
}
}
protected:
TaskList list_;
};
class Reactor {
public:
enum Type {
TYPE_AUTO,
TYPE_EPOLL,
TYPE_KQUEUE,
TYPE_POLL,
TYPE_SELECT,
};
enum EndCallback {
PRIORITY_TIMER = 0,
PRIORITY_DEFER_TASK,
PRIORITY_IDLE_TASK,
PRIORITY_SIGNAL_CALLBACK,
PRIORITY_TRY_EXIT,
PRIORITY_MALLOC_TRIM,
PRIORITY_WORKER_CALLBACK,
};
enum ExitCondition {
EXIT_CONDITION_TIMER = 0,
EXIT_CONDITION_DEFER_TASK,
EXIT_CONDITION_WAIT_PID,
EXIT_CONDITION_CO_SIGNAL_LISTENER,
EXIT_CONDITION_SIGNAL_LISTENER,
EXIT_CONDITION_AIO_TASK,
EXIT_CONDITION_SIGNALFD,
EXIT_CONDITION_USER_BEFORE_DEFAULT,
EXIT_CONDITION_FORCED_TERMINATION,
EXIT_CONDITION_DEFAULT = 999,
EXIT_CONDITION_USER_AFTER_DEFAULT,
};
Type type_;
void *ptr = nullptr;
int native_handle = -1;
/**
* last signal number
*/
int singal_no = 0;
uint32_t max_event_num = 0;
bool running = false;
bool start = false;
bool once = false;
bool wait_exit = false;
bool destroyed = false;
bool bailout = false;
/**
* reactor->wait timeout (millisecond) or -1
*/
int32_t timeout_msec = 0;
uint16_t id = 0;
uint32_t max_socket = 0;
#ifdef SW_USE_MALLOC_TRIM
time_t last_malloc_trim_time = 0;
#endif
ReactorHandler read_handler[SW_MAX_FDTYPE] = {};
ReactorHandler write_handler[SW_MAX_FDTYPE] = {};
ReactorHandler error_handler[SW_MAX_FDTYPE] = {};
ReactorHandler default_write_handler = nullptr;
ReactorHandler default_error_handler = nullptr;
int add(network::Socket *socket, int events) {
return impl->add(socket, events);
}
int set(network::Socket *socket, int events) {
return impl->set(socket, events);
}
int del(network::Socket *socket) {
return impl->del(socket);
}
int wait(struct timeval *timeout) {
return impl->wait(timeout);
}
CallbackManager *defer_tasks = nullptr;
CallbackManager destroy_callbacks;
DeferCallback idle_task;
DeferCallback future_task;
std::function<void(Reactor *)> onBegin;
ssize_t (*write)(Reactor *reactor, network::Socket *socket, const void *buf, size_t n) = nullptr;
ssize_t (*writev)(Reactor *reactor, network::Socket *socket, const iovec *iov, size_t iovcnt) = nullptr;
int (*close)(Reactor *reactor, network::Socket *socket) = nullptr;
private:
ReactorImpl *impl;
std::map<int, std::function<void(Reactor *)>> end_callbacks;
std::map<int, std::function<bool(Reactor *, size_t &)>> exit_conditions;
std::unordered_map<int, network::Socket *> sockets_;
public:
Reactor(int max_event = SW_REACTOR_MAXEVENTS, Type _type = TYPE_AUTO);
~Reactor();
bool if_exit();
void defer(Callback cb, void *data = nullptr);
void set_end_callback(enum EndCallback id, const std::function<void(Reactor *)> &fn);
void set_exit_condition(enum ExitCondition id, const std::function<bool(Reactor *, size_t &)> &fn);
bool set_handler(int _fdtype, ReactorHandler handler);
void add_destroy_callback(Callback cb, void *data = nullptr);
void execute_end_callbacks(bool timedout = false);
void drain_write_buffer(network::Socket *socket);
bool ready() {
return running;
}
size_t remove_exit_condition(enum ExitCondition id) {
return exit_conditions.erase(id);
}
bool isset_exit_condition(enum ExitCondition id) {
return exit_conditions.find(id) != exit_conditions.end();
}
bool isset_handler(int fdtype) {
return read_handler[fdtype] != nullptr;
}
int add_event(network::Socket *_socket, EventType event_type) {
if (!(_socket->events & event_type)) {
return set(_socket, _socket->events | event_type);
}
return SW_OK;
}
int del_event(network::Socket *_socket, EventType event_type) {
if (_socket->events & event_type) {
return set(_socket, _socket->events & (~event_type));
}
return SW_OK;
}
int remove_read_event(network::Socket *_socket) {
if (_socket->events & SW_EVENT_WRITE) {
_socket->events &= (~SW_EVENT_READ);
return set(_socket, _socket->events);
} else {
return del(_socket);
}
}
int remove_write_event(network::Socket *_socket) {
if (_socket->events & SW_EVENT_READ) {
_socket->events &= (~SW_EVENT_WRITE);
return set(_socket, _socket->events);
} else {
return del(_socket);
}
}
int add_read_event(network::Socket *_socket) {
if (_socket->events & SW_EVENT_WRITE) {
_socket->events |= SW_EVENT_READ;
return set(_socket, _socket->events);
} else {
return add(_socket, SW_EVENT_READ);
}
}
int add_write_event(network::Socket *_socket) {
if (_socket->events & SW_EVENT_READ) {
_socket->events |= SW_EVENT_WRITE;
return set(_socket, _socket->events);
} else {
return add(_socket, SW_EVENT_WRITE);
}
}
bool exists(network::Socket *_socket) {
return !_socket->removed && _socket->events;
}
int get_timeout_msec() {
return defer_tasks == nullptr ? timeout_msec : 0;
}
size_t get_event_num() {
return sockets_.size();
}
const std::unordered_map<int, network::Socket *> &get_sockets() {
return sockets_;
}
network::Socket *get_socket(int fd) {
return sockets_[fd];
}
void foreach_socket(const std::function<void(int, network::Socket *)> &callback) {
for (auto &kv : sockets_) {
callback(kv.first, kv.second);
}
}
ReactorHandler get_handler(EventType event_type, FdType fd_type) {
switch (event_type) {
case SW_EVENT_READ:
return read_handler[fd_type];
case SW_EVENT_WRITE:
return write_handler[fd_type] ? write_handler[fd_type] : default_write_handler;
case SW_EVENT_ERROR:
return error_handler[fd_type] ? error_handler[fd_type] : default_error_handler;
default:
abort();
break;
}
return nullptr;
}
ReactorHandler get_error_handler(FdType fd_type) {
ReactorHandler handler = get_handler(SW_EVENT_ERROR, fd_type);
// error callback is not set, try to use readable or writable callback
if (handler == nullptr) {
handler = get_handler(SW_EVENT_READ, fd_type);
if (handler == nullptr) {
handler = get_handler(SW_EVENT_WRITE, fd_type);
}
}
return handler;
}
void before_wait() {
start = running = true;
}
int trigger_close_event(Event *event) {
return default_error_handler(this, event);
}
void set_wait_exit(bool enable) {
wait_exit = enable;
}
void _add(network::Socket *_socket, int events) {
_socket->events = events;
_socket->removed = 0;
sockets_[_socket->fd] = _socket;
}
void _set(network::Socket *_socket, int events) {
_socket->events = events;
}
void _del(network::Socket *_socket) {
_socket->events = 0;
_socket->removed = 1;
sockets_.erase(_socket->fd);
}
bool catch_error() {
switch (errno) {
case EINTR:
return true;
}
return false;
}
static ssize_t _write(Reactor *reactor, network::Socket *socket, const void *buf, size_t n);
static ssize_t _writev(Reactor *reactor, network::Socket *socket, const iovec *iov, size_t iovcnt);
static int _close(Reactor *reactor, network::Socket *socket);
static int _writable_callback(Reactor *reactor, Event *ev);
void activate_future_task();
static FdType get_fd_type(int flags) {
return (FdType)(flags & (~SW_EVENT_READ) & (~SW_EVENT_WRITE) & (~SW_EVENT_ERROR) & (~SW_EVENT_ONCE));
}
static bool isset_read_event(int events) {
return (events < SW_EVENT_DEAULT) || (events & SW_EVENT_READ);
}
static bool isset_write_event(int events) {
return events & SW_EVENT_WRITE;
}
static bool isset_error_event(int events) {
return events & SW_EVENT_ERROR;
}
};
} // namespace swoole
#define SW_REACTOR_CONTINUE \
if (reactor_->once) { \
break; \
} else { \
continue; \
}
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