7 #include <sys/socket.h>
10 #include <sys/ioctl.h>
11 #include <sys/epoll.h>
20 #include "mutexlock.h"
24 Client::Client(int sock)
25 : state(Client::READING_REQUEST),
29 request.reserve(1024);
34 pthread_mutex_init(&mutex, NULL);
36 epoll_fd = epoll_create(1024); // Size argument is ignored.
47 // Joinable is already the default, but it's good to be certain.
49 pthread_attr_init(&attr);
50 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
51 pthread_create(&worker_thread, &attr, Server::do_work_thunk, this);
57 MutexLock lock(&mutex);
61 if (pthread_join(worker_thread, NULL) == -1) {
62 perror("pthread_join");
67 void *Server::do_work_thunk(void *arg)
69 Server *server = static_cast<Server *>(arg);
74 void Server::do_work()
77 int nfds = epoll_wait(epoll_fd, events, EPOLL_MAX_EVENTS, EPOLL_TIMEOUT_MS);
83 MutexLock lock(&mutex); // We release the mutex between iterations.
89 for (int i = 0; i < nfds; ++i) {
90 int fd = events[i].data.fd;
91 assert(clients.count(fd) != 0);
92 Client *client = &clients[fd];
94 if (events[i].events & (EPOLLERR | EPOLLRDHUP | EPOLLHUP)) {
99 process_client(client);
104 void Server::add_client(int sock)
106 MutexLock lock(&mutex);
107 clients.insert(make_pair(sock, Client(sock)));
109 // Start listening on data from this socket.
111 ev.events = EPOLLIN | EPOLLRDHUP;
113 if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, sock, &ev) == -1) {
114 perror("epoll_ctl(EPOLL_CTL_ADD)");
119 void Server::add_stream(const string &stream_id)
121 MutexLock lock(&mutex);
122 streams.insert(make_pair(stream_id, Stream()));
125 void Server::set_header(const string &stream_id, const string &header)
127 MutexLock lock(&mutex);
128 assert(streams.count(stream_id) != 0);
129 streams[stream_id].header = header;
132 void Server::add_data(const string &stream_id, const char *data, size_t bytes)
138 MutexLock lock(&mutex);
139 assert(streams.count(stream_id) != 0);
140 Stream *stream = &streams[stream_id];
141 size_t pos = stream->data_size % BACKLOG_SIZE;
142 stream->data_size += bytes;
144 if (pos + bytes > BACKLOG_SIZE) {
145 size_t to_copy = BACKLOG_SIZE - pos;
146 memcpy(stream->data + pos, data, to_copy);
152 memcpy(stream->data + pos, data, bytes);
153 wake_up_all_clients();
156 void Server::process_client(Client *client)
158 switch (client->state) {
159 case Client::READING_REQUEST: {
160 // Try to read more of the request.
162 int ret = read(client->sock, buf, sizeof(buf));
165 close_client(client);
169 // No data? This really means that we were triggered for something else than
170 // POLLIN (which suggests a logic error in epoll).
171 fprintf(stderr, "WARNING: fd %d returned unexpectedly 0 bytes!\n", client->sock);
172 close_client(client);
176 // Guard against overlong requests gobbling up all of our space.
177 if (client->request.size() + ret > MAX_CLIENT_REQUEST) {
178 fprintf(stderr, "WARNING: fd %d sent overlong request!\n", client->sock);
179 close_client(client);
183 // See if we have \r\n\r\n anywhere in the request. We start three bytes
184 // before what we just appended, in case we just got the final character.
185 size_t existing_req_bytes = client->request.size();
186 client->request.append(string(buf, buf + ret));
188 size_t start_at = (existing_req_bytes >= 3 ? existing_req_bytes - 3 : 0);
189 const char *ptr = reinterpret_cast<char *>(
190 memmem(client->request.data() + start_at, client->request.size() - start_at,
193 // OK, we don't have the entire header yet. Fine; we'll get it later.
197 if (ptr != client->request.data() + client->request.size() - 4) {
198 fprintf(stderr, "WARNING: fd %d had junk data after request!\n", client->sock);
199 close_client(client);
203 parse_request(client);
206 case Client::SENDING_HEADER: {
207 int ret = write(client->sock,
208 client->header.data() + client->header_bytes_sent,
209 client->header.size() - client->header_bytes_sent);
212 close_client(client);
216 client->header_bytes_sent += ret;
217 assert(client->header_bytes_sent <= client->header.size());
219 if (client->header_bytes_sent < client->header.size()) {
220 // We haven't sent all yet. Fine; we'll do that later.
224 // We're done sending the header! Clear the entire header to release some memory.
225 client->header.clear();
227 // Start sending from the end. In other words, we won't send any of the backlog,
228 // but we'll start sending immediately as we get data.
229 client->state = Client::SENDING_DATA;
230 client->bytes_sent = streams[client->stream_id].data_size;
233 case Client::SENDING_DATA: {
234 // See if there's some data we've lost. Ideally, we should drop to a block boundary,
235 // but resync will be the mux's problem.
236 const Stream &stream = streams[client->stream_id];
237 size_t bytes_to_send = stream.data_size - client->bytes_sent;
238 if (bytes_to_send > BACKLOG_SIZE) {
239 fprintf(stderr, "WARNING: fd %d lost %lld bytes, maybe too slow connection\n",
241 (long long int)(bytes_to_send - BACKLOG_SIZE));
242 client->bytes_sent = streams[client->stream_id].data_size - BACKLOG_SIZE;
243 bytes_to_send = BACKLOG_SIZE;
246 // See if we need to split across the circular buffer.
248 if ((client->bytes_sent % BACKLOG_SIZE) + bytes_to_send > BACKLOG_SIZE) {
249 size_t bytes_first_part = BACKLOG_SIZE - (client->bytes_sent % BACKLOG_SIZE);
252 iov[0].iov_base = const_cast<char *>(stream.data + (client->bytes_sent % BACKLOG_SIZE));
253 iov[0].iov_len = bytes_first_part;
255 iov[1].iov_base = const_cast<char *>(stream.data);
256 iov[1].iov_len = bytes_to_send - bytes_first_part;
258 ret = writev(client->sock, iov, 2);
260 ret = write(client->sock,
261 stream.data + (client->bytes_sent % BACKLOG_SIZE),
265 perror("write/writev");
266 close_client(client);
269 client->bytes_sent += ret;
271 if (client->bytes_sent == stream.data_size) {
272 // We don't have any more data for this client, so put it to sleep.
273 put_client_to_sleep(client);
282 void Server::parse_request(Client *client)
284 // TODO: Actually parse the request. :-)
285 client->stream_id = "stream";
286 client->request.clear();
288 // Construct the header.
289 client->header = "HTTP/1.0 200 OK\r\n Content-type: video/x-flv\r\nCache-Control: no-cache\r\nContent-type: todo/fixme\r\n\r\n" +
290 streams[client->stream_id].header;
293 client->state = Client::SENDING_HEADER;
296 ev.events = EPOLLOUT | EPOLLRDHUP;
297 ev.data.fd = client->sock;
299 if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
300 perror("epoll_ctl(EPOLL_CTL_MOD)");
305 void Server::close_client(Client *client)
307 if (epoll_ctl(epoll_fd, EPOLL_CTL_DEL, client->sock, NULL) == -1) {
308 perror("epoll_ctl(EPOLL_CTL_DEL)");
312 // This client could be sleeping, so we'll need to fix that. (Argh, O(n).)
313 vector<int>::iterator new_end =
314 remove(sleeping_clients.begin(), sleeping_clients.end(), client->sock);
315 sleeping_clients.erase(new_end, sleeping_clients.end());
319 clients.erase(client->sock);
322 void Server::put_client_to_sleep(Client *client)
325 ev.events = EPOLLRDHUP;
326 ev.data.fd = client->sock;
328 if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
329 perror("epoll_ctl(EPOLL_CTL_MOD)");
333 sleeping_clients.push_back(client->sock);
336 void Server::wake_up_all_clients()
338 for (unsigned i = 0; i < sleeping_clients.size(); ++i) {
340 ev.events = EPOLLOUT | EPOLLRDHUP;
341 ev.data.fd = sleeping_clients[i];
342 if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, sleeping_clients[i], &ev) == -1) {
343 perror("epoll_ctl(EPOLL_CTL_MOD)");
347 sleeping_clients.clear();