trafficserver的Net模块源码注释-FinClip官网

trafficserver的Net模块源码注释

网友投稿 567 2022-09-22

trafficserver的Net模块源码注释

Net的启动流程：main.ccmain()--->UnixNetProcessor::start()Net模块的启动intUnixNetProcessor::start(int, size_t){ EventType etype = ET_NET;//给NetHandler实例分配空间 netHandler_offset = eventProcessor.allocate(sizeof(NetHandler));//给PollCont实例分配空间 pollCont_offset = eventProcessor.allocate(sizeof(PollCont));//UnixNetProcessor对应的事件类型是ET_NET，如果是sslNetProcessor则对应的事件类型是ET_SSL upgradeEtype(etype);//从eventProcessor获得net的线程，这事在event模块初始化时做好的 n_netthreads = eventProcessor.n_threads_for_type[etype];//从eventProcessor获得net的线程数量 netthreads = eventProcessor.eventthread[etype];//初始化所有Net线程 for (int i = 0; i < n_netthreads; ++i) { initialize_thread_for_net(netthreads[i]);#ifndef STANDALONE_IOCORE extern void initialize_thread_for_*thread, int thread_index); initialize_thread_for_i);#endif } RecData d; d.rec_int = 0;//设置网络链接数的阈值 change_net_connections_throttle(NULL, RECD_INT, d, NULL);//sock相关，很少使用，这里先不介绍 if (!netProcessor.socks_conf_stuff) { socks_conf_stuff = NEW(new socks_conf_struct); loadSocksConfiguration(socks_conf_stuff); if (!socks_conf_stuff->socks_needed && socks_conf_stuff->accept_enabled) { Warning("We can not have accept_enabled and socks_needed turned off" " disabling Socks accept\n"); socks_conf_stuff->accept_enabled = 0; } else { socks_conf_stuff = netProcessor.socks_conf_stuff; } }//在页面上显示Net相关的统计信息#ifdef NON_MODULAR extern Action *register_ShowNet(Continuation * c, HTTPHdr * h); if (etype == ET_NET) statPagesManager.register_register_ShowNet);#endif return 1;}main()--->UnixNetProcessor::start()--->initialize_thread_for_net()顾名思义，这个函数的功能是为网络初始化一个线程，voidinitialize_thread_for_net(EThread *thread){//创建NetHandler、PollCont实例//NetHandler：用于处理Net相关的所有时间//PollCont：是一个Poll的continuation（ats的设计思想），包含指向NetHandler和PollDescriptor的指针//PollDescriptor：Poll的描述封装结构 new((ink_dummy_for_new *) get_NetHandler(thread)) NetHandler(); new((ink_dummy_for_new *) get_PollCont(thread)) PollCont(thread->mutex, get_NetHandler(thread)); get_NetHandler(thread)->mutex = new_ProxyMutex(); PollCont *pc = get_PollCont(thread); PollDescriptor *pd = pc->pollDescriptor;//调用NetHandler实例启动，最终会每秒调用NetHandler::mainNetEvent()函数 thread->schedule_imm(get_NetHandler(thread));#ifndef INACTIVITY_TIMEOUT//创建InactivityCop实例，InactivityCop会定时（1秒）判断每个链接vc是否可以关闭然后进行关闭处理 InactivityCop *inactivityCop = NEW(new InactivityCop(get_NetHandler(thread)->mutex));//定时调度 inactivityCop的check_inactivity()函数 thread->schedule_every(inactivityCop, HRTIME_SECONDS(1));#endif//注册信号处理函数 thread->signal_hook = net_signal_hook_function;//创建EventIO实例并初始化 thread->ep = (EventIO*)ats_malloc(sizeof(EventIO)); thread->ep->type = EVENTIO_ASYNC_SIGNAL;#if HAVE_EVENTFD//启动EventIO实例,使用epoll注册读事件（不知道epoll的先看一下啊） thread->ep->start(pd, thread->evfd, 0, EVENTIO_READ);#else thread->ep->start(pd, thread->evpipe[0], 0, EVENTIO_READ);#endif}NetHandler的初始化main()--->UnixNetProcessor::start()--->NetHandler::NetHandler()设置NetHandler的handler为NetHandler::startNetEventNetHandler::NetHandler():Continuation(NULL), trigger_event(0){ SET_HANDLER((NetContHandler) & NetHandler::startNetEvent);}设置NetHandler的handler为NetHandler::mainNetEvent，并定时调度该函数执行intNetHandler::startNetEvent(int event, Event *e){ (void) event; SET_HANDLER((NetContHandler) & NetHandler::mainNetEvent); e->schedule_every(NET_PERIOD); trigger_event = e; return EVENT_CONT;}PollCont的初始化main()--->UnixNetProcessor::start()--->PollCont::PollCont()PollCont::PollCont(ProxyMutex *m, NetHandler *nh, int pt):Continuation(m), net_handler(nh), poll_timeout(pt){//创建PollDescriptor实例 pollDescriptor = NEW(new PollDescriptor);//初始化PollDescriptor实例 pollDescriptor->init();//设置PollCont的handler为 PollCont::pollEvent SET_HANDLER(&PollCont::pollEvent);}PollDescriptor的初始化main()--->UnixNetProcessor::start()--->PollCont::PollCont()--->init() PollDescriptor *init() { result = 0;#if TS_USE_EPOLL nfds = 0;//创建epoll用的文件描述符 epoll_fd = epoll_create(POLL_DESCRIPTOR_SIZE); memset(ePoll_Triggered_Events, 0, sizeof(ePoll_Triggered_Events)); memset(pfd, 0, sizeof(pfd));#endif...... return this; }main()--->UnixNetProcessor::start()--->initialize_thread_for_net()--->NetHandler::mainNetEvent()这个函数看起来有点长，先说一下它的功能：首先是调用epoll_wait()等待事件，再次是根据事件的类型做不同的处理，事件分为EVENTIO_READWRITE_VC（读写事件）、EVENTIO_DNS_CONNECTION（DNS的CONNECT事件）、EVENTIO_ASYNC_SIGNAL（同步信号事件），正常的HTTP请求的接收和响应属于EVENTIO_READWRITE_VC，DNS请求发送流程时说过，调用connect()函数来发送DNS请求时会调用epoll_ctl()来注册响应的事件，这就是EVENTIO_DNS_CONNECTION，我们先不关心EVENTIO_ASYNC_SIGNAL。最后是分别遍历Handler的可读和可写队列，并调用read和write进行读和写，然后通知上层intNetHandler::mainNetEvent(int event, Event *e){ ink_assert(trigger_event == e && (event == EVENT_INTERVAL || event == EVENT_POLL)); (void) event; (void) e; EventIO *epd = NULL; int poll_timeout = net_config_poll_timeout;//计数信息++ NET_INCREMENT_DYN_STAT(net_handler_run_stat);//处理NetHandler的可读和可写队列上的时间UnixNetVConnection，这里你可以看作什么都不做 process_enabled_list(this); if (likely(!read_ready_list.empty() || !write_ready_list.empty() || !read_enable_list.empty() || !write_enable_list.empty())) poll_timeout = 0; else poll_timeout = net_config_poll_timeout; PollDescriptor *pd = get_PollDescriptor(trigger_event->ethread); UnixNetVConnection *vc = NULL;#if TS_USE_EPOLL//调用epoll事件 pd->result = epoll_wait(pd->epoll_fd, pd->ePoll_Triggered_Events, POLL_DESCRIPTOR_SIZE, poll_timeout); NetDebug("iocore_net_main_poll", "[NetHandler::mainNetEvent] epoll_wait(%d,%d), result=%d", pd->epoll_fd,poll_timeout,pd->result); ......//处理所有的事件 vc = NULL; for (int x = 0; x < pd->result; x++) { epd = (EventIO*) get_ev_data(pd,x);// EVENTIO_READWRITE_VC事件的处理：如果是读事件则加入到NetHandler的可读链表read_ready_list，如果是写事件加入NetHandler的可读链表write_ready_list if (epd->type == EVENTIO_READWRITE_VC) { vc = epd->data.vc; if (get_ev_events(pd,x) & (EVENTIO_READ|EVENTIO_ERROR)) { vc->read.triggered = 1; if (!read_ready_list.in(vc)) read_ready_list.enqueue(vc); else if (get_ev_events(pd,x) & EVENTIO_ERROR) { // check for unhandled epoll events that should be handled Debug("iocore_net_main", "Unhandled epoll event on read: 0x%04x read.enabled=%d closed=%d read-ready_queue=%d", get_ev_events(pd,x), vc->read.enabled, vc->closed, read_ready_list.in(vc)); } } vc = epd->data.vc; if (get_ev_events(pd,x) & (EVENTIO_WRITE|EVENTIO_ERROR)) { vc->write.triggered = 1; if (!write_ready_list.in(vc)) write_ready_list.enqueue(vc); else if (get_ev_events(pd,x) & EVENTIO_ERROR) { Debug("iocore_net_main", "Unhandled epoll event on write: 0x%04x write.enabled=%d closed=%d write-ready_queue=%d", get_ev_events(pd,x), vc->write.enabled, vc->closed, write_ready_list.in(vc)); } } else if (!get_ev_events(pd,x) & EVENTIO_ERROR) { Debug("iocore_net_main", "Unhandled epoll event: 0x%04x", get_ev_events(pd,x)); }//EVENTIO_DNS_CONNECTION事件的处理：加入DNSHandler的triggered队列 } else if (epd->type == EVENTIO_DNS_CONNECTION) { if (epd->data.dnscon != NULL) { epd->data.dnscon->trigger(); #if defined(USE_EDGE_TRIGGER) epd->refresh(EVENTIO_READ);#endif } } else if (epd->type == EVENTIO_ASYNC_SIGNAL) net_signal_hook_callback(trigger_event->ethread); ev_next_event(pd,x); } pd->result = 0;#if defined(USE_EDGE_TRIGGER)//遍历Handler的可读队列中的vc，调用net_read_io分别处理每个vc，而net_read_io的功能就是调用read去接收数据，然后通知上层（HttpSM） while ((vc = read_ready_list.dequeue())) { if (vc->closed) close_UnixNetVConnection(vc, trigger_event->ethread); else if (vc->read.enabled && vc->read.triggered) vc->net_read_io(this, trigger_event->ethread); else if (!vc->read.enabled) { read_ready_list.remove(vc); } }//遍历Handler的可写队列中的vc，调用write_to_net分别处理每个vc，而write_to_net的功能就是调用write去发送数据，然后通知上层（HttpSM） while ((vc = write_ready_list.dequeue())) { if (vc->closed) close_UnixNetVConnection(vc, trigger_event->ethread); else if (vc->write.enabled && vc->write.triggered) write_to_net(this, vc, trigger_event->ethread); else if (!vc->write.enabled) { write_ready_list.remove(vc); } } return EVENT_CONT;}别忘了InactivityCop这个结构main()--->UnixNetProcessor::start()--->initialize_thread_for_net()--->InactivityCop()设置handler为InactivityCop::check_inactivity，该函数被每秒中调用一次struct InactivityCop : public Continuation { InactivityCop(ProxyMutex *m):Continuation(m) { SET_HANDLER(&InactivityCop::check_inactivity); }main()--->UnixNetProcessor::start()--->initialize_thread_for_net()--->InactivityCop()---> InactivityCop::check_inactivity() int check_inactivity(int event, Event *e) { (void) event; ink_hrtime now = ink_get_hrtime(); NetHandler *nh = get_NetHandler(this_ethread());//遍历NetHandler的链接队列，判断和本线程是不是统一线程，是的话加到NetHandler的cop_list队列 forl_LL(UnixNetVConnection, vc, nh->open_list) { if (vc->thread == this_ethread()) nh->cop_list.push(vc); } while (UnixNetVConnection *vc = nh->cop_list.pop()) { // If we cannot ge tthe lock don't stop just keep cleaning MUTEX_TRY_LOCK(lock, vc->mutex, this_ethread()); if (!lock.lock_acquired) { NET_INCREMENT_DYN_STAT(inactivity_cop_lock_acquire_failure_stat); continue; }//如果该链接vc已设置为关闭状态，则调用close_UnixNetVConnection()进行关闭操作 if (vc->closed) { close_UnixNetVConnection(vc, e->ethread); continue; } if (vc->next_inactivity_timeout_at && vc->next_inactivity_timeout_at < now)//调用vc的handler（UnixNetVConnection::mainEvent）进行处理 vc->handleEvent(EVENT_IMMEDIATE, e); } return 0; } 好了，到此为止，NetProcessor的启动流程已经分析完成，可以简单得总结为：NetProcessor的启动主要任务是初始化几个线程定时调用epoll_wait()等待读写事件，如果有读事件到来时调用read进行读操作，然后把读到的数据传给上层处理，如果有写事件到来时调用write进行发送操作，发送完成后通知上层发送结果。那么读写事件是怎么来的呢？根据网络编程的经验，server在read和write之前一般都要accept，这里的读写事件正是来于accept，下面来分析NetProcessor的accept。NetProcessor的accept是在HttpProxyServer启动时调用的，正确的说是main_accept()函数。main()--->start_HttpProxyServer()voidstart_HttpProxyServer(){//根据配置，每个端口(默认只有一个：8080)创建一个Acceptor for ( int i = 0 , n = proxy_ports.length() ; i < n ; ++i ) { HttpProxyAcceptor& acceptor = HttpProxyAcceptors[i]; HttpProxyPort& port = proxy_ports[i]; ...... if (NULL == netProcessor.main_accept(acceptor._accept, port.m_fd, acceptor._net_opt)) return; } ...... }}main()--->start_HttpProxyServer()--->NetProcessor::main_accept()Action *NetProcessor::main_accept(Continuation *cont, SOCKET fd, AcceptOptions const& opt){ UnixNetProcessor* this_unp = static_cast(this); Debug("iocore_net_processor", "NetProcessor::main_accept - port %d,recv_bufsize %d, send_bufsize %d, sockopt 0x%0x", opt.local_port, opt.recv_bufsize, opt.send_bufsize, opt.sockopt_flags);//直接调用UnixNetProcessor::accept_internal() return this_unp->accept_internal(cont, fd, opt);}main()--->start_HttpProxyServer()--->NetProcessor::main_accept()--->UnixNetProcessor::accept_internal()Action *UnixNetProcessor::accept_internal(Continuation *cont, int fd, AcceptOptions const& opt){ EventType et = opt.etype; //创建NetAccept实例 NetAccept *na = createNetAccept(); EThread *thread = this_ethread(); ProxyMutex *mutex = thread->mutex; int accept_threads = opt.accept_threads; IpEndpoint accept_ip; upgradeEtype(et);//opt是从配置里读出来的网络相关的配置，作为Net的选项，具体的配置想请看ATS配置说明 if (opt.accept_threads < 0) { REC_ReadConfigInteger(accept_threads, "proxy.config.accept_threads"); } NET_INCREMENT_DYN_STAT(net_accepts_currently_open_stat);//根据配置的模式设置server的地址 if (opt.localhost_only) { accept_ip.setToLoopback(opt.ip_family); } else if (opt.local_ip.isValid()) { accept_ip.assign(opt.local_ip); } else { accept_ip.setToAnyAddr(opt.ip_family); } ink_assert(0 < opt.local_port && opt.local_port < 65536); accept_ip.port() = htons(opt.local_port); na->accept_fn = net_accept; na->server.fd = fd; ats_ip_copy(&na->server.accept_addr, &accept_ip); na->server.f_inbound_transparent = opt.f_inbound_transparent;//透明代理 if (opt.f_inbound_transparent) { Debug( ""Marking accept server %p on port %d as inbound transparent", na, opt.local_port); } int should_filter_int = 0; na->server.= false;//查看该配置项的说明，只有数据到来时才会accept，默认等45秒没来就放弃，是在下面调用setsockopt()通过设置socket的选项来实现的 REC_ReadConfigInteger(should_filter_int, "proxy.config-.defer_accept"); if (should_filter_int > 0 && opt.etype == ET_NET) na->server.= true; na->action_ = NEW(new NetAcceptAction()); *na->action_ = cont;//指向上层的continuation，如HttpAccept//下面是初始化接收buffer大小等网络的一些参数 na->action_->server = &na->server; na->callback_on_open = opt.f_callback_on_open; na->recv_bufsize = opt.recv_bufsize; na->send_bufsize = opt.send_bufsize; na->sockopt_flags = opt.sockopt_flags; na->packet_mark = opt.packet_mark; na->packet_tos = opt.packet_tos; na->etype = opt.etype; na->backdoor = opt.backdoor; if (na->callback_on_open) na->mutex = cont->mutex;//实时接收 if (opt.frequent_accept) { //配置的accept的线程数 if (accept_threads > 0) { //设置socket的选项 if (0 == na->do_listen(BLOCKING, opt.f_inbound_transparent)) { NetAccept *a; //循环为每个线程创建NetAccept实例，并把上面创建的na赋值给之，最后调用NetAccept的 init_accept_loop()函数进入循环地accept的状态 for (int i=1; i < accept_threads; ++i) { a = createNetAccept(); *a = *na; a->init_accept_loop(); Debug("iocore_net_accept", "Created accept thread #%d for port %d", i, ats_ip_port_host_order(&accept_ip)); } Debug("iocore_net_accept", "Created accept thread #%d for port %d", accept_threads, ats_ip_port_host_order(&accept_ip)); na->init_accept_loop(); } } else { na->init_accept_per_thread(); } } else na->init_accept();//查看该配置项的说明，只有数据到来时才会accept，默认等45秒没来就放弃，是在下面调用setsockopt()通过设置socket的选项来实现的#ifdef TCP_DEFER_ACCEPT if (should_filter_int > 0) { setsockopt(na->server.fd, IPPROTO_TCP, TCP_DEFER_ACCEPT, &should_filter_int, sizeof(int)); }#endif return na->action_;}main()--->start_HttpProxyServer()--->NetProcessor::main_accept()--->UnixNetProcessor::accept_internal()--->NetAccept::init_accept_loop()该函数的功能是创建一个线程，并设置线程的执行函数为NetAccept::acceptLoopEventvoidNetAccept::init_accept_loop(){ size_t stacksize;//线程栈的大小 REC_ReadConfigInteger(stacksize, "proxy.config.thread.default.stacksize"); SET_CONTINUATION_HANDLER(this, &NetAccept::acceptLoopEvent); eventProcessor.spawn_thread(this, "[ACCEPT]", stacksize);}main()--->start_HttpProxyServer()--->NetProcessor::main_accept()--->UnixNetProcessor::accept_internal()--->NetAccept::init_accept_loop()--->NetAccept::acceptLoopEvent()intNetAccept::acceptLoopEvent(int event, Event * e){ (void) event; (void) e; EThread *t = this_ethread();//妈啊，终于看到死循环在accept了（当然listen已经在前面了采用accept） while (1) do_blocking_accept(t); NET_DECREMENT_DYN_STAT(net_accepts_currently_open_stat); delete this; return EVENT_DONE;}main()--->start_HttpProxyServer()--->NetProcessor::main_accept()--->UnixNetProcessor::accept_internal()--->NetAccept::init_accept_loop()--->NetAccept::acceptLoopEvent()--->NetAccept::do_blocking_accept()该函数的功能是循环地调用accept去接收请求，并让event系统调度去处理每个链接 UnixNetVConnectionintNetAccept::do_blocking_accept(EThread * t){ int res = 0; int loop = accept_till_done; UnixNetVConnection *vc = NULL; do { //创建表示一个链接的UnixNetVConnection的实例 vc = (UnixNetVConnection *)alloc_cache; if (likely(!vc)) { vc = allocateGlobal(); vc->from_accept_thread = true; vc->id = net_next_connection_number(); alloc_cache = vc; } //流量控制 ink_hrtime now = ink_get_hrtime(); while (!backdoor && check_net_throttle(ACCEPT, now)) { check_throttle_warning(); if (!unix_netProcessor.throttle_error_message) { safe_delay(NET_THROTTLE_DELAY); } else if (send_throttle_message(this) < 0) { goto Lerror; } now = ink_get_hrtime(); } //调用accept去接收请求 if ((res = server.accept(&vc->con)) < 0) { //错误处理 Lerror: int seriousness = accept_error_seriousness(res); if (seriousness >= 0) { if (!seriousness) check_transient_accept_error(res); safe_delay(NET_THROTTLE_DELAY); return 0; } if (!action_->cancelled) { MUTEX_LOCK(lock, action_->mutex, t); action_->continuation->handleEvent(EVENT_ERROR, (void *)(intptr_t)res); MUTEX_UNTAKE_LOCK(action_->mutex, t); Warning("accept thread received fatal error: errno = %d", errno); } return -1; } //流量控制 check_emergency_throttle(vc->con); alloc_cache = NULL; NET_SUM_GLOBAL_DYN_STAT(net_connections_currently_open_stat, 1); //设置vc的时间和server的ip地址 vc->submit_time = now; ats_ip_copy(&vc->server_addr, &vc->con.addr); //透明代理标志位 vc->set_is_transparent(server.f_inbound_transparent); vc->mutex = new_ProxyMutex(); vc->action_ = *action_; //设置UnixNetVConnection的handler为UnixNetVConnection::acceptEvent SET_CONTINUATION_HANDLER(vc, (NetVConnHandler) & UnixNetVConnection::acceptEvent); //让event系统调度vc的handler执行 eventProcessor.schedule_imm_signal(vc, getEtype()); } while (loop); return 1;}main()--->start_HttpProxyServer()--->NetProcessor::main_accept()--->UnixNetProcessor::accept_internal()--->NetAccept::init_accept_loop()--->NetAccept::acceptLoopEvent()--->NetAccept::do_blocking_accept()--->UnixNetVConnection::acceptEvent()该函数的功能是接收一个链接，向NetHandler注册读写事件，让NetHandler去接收该链接的数据和发送对该请求的响应报文（NetHandler肯定是干这个事的啊），最后调用上层（HttpSM）的handler（HttpAccept::mainEvent）来接收该链接intUnixNetVConnection::acceptEvent(int event, Event *e){ thread = e->ethread; MUTEX_TRY_LOCK(lock, get_NetHandler(thread)->mutex, e->ethread); if (!lock) { if (event == EVENT_NONE) { thread->schedule_in(this, NET_RETRY_DELAY); return EVENT_DONE; } else { e->schedule_in(NET_RETRY_DELAY); return EVENT_CONT; } } if (action_.cancelled) { free(thread); return EVENT_DONE; }//设置UnixNetVConnection的handler为UnixNetVConnection::mainEvent SET_HANDLER((NetVConnHandler) & UnixNetVConnection::mainEvent);//获取指向NetHandler的指针，NetHandler前面介绍过了 nh = get_NetHandler(thread);//获取指向PollDescriptor的指针，PollDescriptor前面介绍过了 PollDescriptor *pd = get_PollDescriptor(thread);//注册epoll读和写事件，这会和上面的流程联系起来了吧 if (ep.start(pd, this, EVENTIO_READ|EVENTIO_WRITE) < 0) { Debug("iocore_net", "acceptEvent : failed EventIO::start\n"); close_UnixNetVConnection(this, e->ethread); return EVENT_DONE; }//把vc加入NetHandler的开链接队列open_list nh->open_list.enqueue(this);//设置相应的超时时间用于关闭链接 if (inactivity_timeout_in) UnixNetVConnection::set_inactivity_timeout(inactivity_timeout_in); if (active_timeout_in) UnixNetVConnection::set_active_timeout(active_timeout_in);//调用上层的handler来处理本次链接，如HttpAccept::mainEvent，怎么处理留到HTTP流程再分析 action_.continuation->handleEvent(NET_EVENT_ACCEPT, this); return EVENT_DONE;}HttpSM <----------------------HttpAccept ^ ^ | | | | | 注册READ/WRITE事件 | NetHandler <------------------NetAccept ^ ^ | | | | | | | | read() write() accept() 此外，NetProcessor还有两个函数要说明，那就是NetProcessor::connect_s()和NetProcessor::connect_re()。这两个函数都是给上层提供的connect接口，他们的区别是一个是异步的一个是同步的，connect_s是同步，connect_re是异步。

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