7 #include <sys/socket.h>
10 #include <sys/ioctl.h>
11 #include <sys/epoll.h>
20 #include "mutexlock.h"
26 pthread_mutex_init(&mutex, NULL);
28 epoll_fd = epoll_create(1024); // Size argument is ignored.
39 // Joinable is already the default, but it's good to be certain.
41 pthread_attr_init(&attr);
42 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
43 pthread_create(&worker_thread, &attr, Server::do_work_thunk, this);
49 MutexLock lock(&mutex);
53 if (pthread_join(worker_thread, NULL) == -1) {
54 perror("pthread_join");
59 void *Server::do_work_thunk(void *arg)
61 Server *server = static_cast<Server *>(arg);
66 void Server::do_work()
69 int nfds = epoll_wait(epoll_fd, events, EPOLL_MAX_EVENTS, EPOLL_TIMEOUT_MS);
75 MutexLock lock(&mutex); // We release the mutex between iterations.
81 for (int i = 0; i < nfds; ++i) {
82 int fd = events[i].data.fd;
83 assert(clients.count(fd) != 0);
84 Client *client = &clients[fd];
86 if (events[i].events & (EPOLLERR | EPOLLRDHUP | EPOLLHUP)) {
91 process_client(client);
96 void Server::add_client(int sock)
98 MutexLock lock(&mutex);
100 new_client.sock = sock;
101 new_client.request.reserve(1024);
102 new_client.state = Client::READING_REQUEST;
103 new_client.header_bytes_sent = 0;
104 new_client.bytes_sent = 0;
106 clients.insert(make_pair(sock, new_client));
108 // Start listening on data from this socket.
110 ev.events = EPOLLIN | EPOLLRDHUP;
112 if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, sock, &ev) == -1) {
113 perror("epoll_ctl(EPOLL_CTL_ADD)");
118 void Server::add_stream(const string &stream_id)
120 MutexLock lock(&mutex);
121 streams.insert(make_pair(stream_id, Stream()));
124 void Server::set_header(const string &stream_id, const string &header)
126 MutexLock lock(&mutex);
127 assert(streams.count(stream_id) != 0);
128 streams[stream_id].header = header;
131 void Server::add_data(const string &stream_id, const char *data, size_t bytes)
137 MutexLock lock(&mutex);
138 assert(streams.count(stream_id) != 0);
139 Stream *stream = &streams[stream_id];
140 size_t pos = stream->data_size % BACKLOG_SIZE;
141 stream->data_size += bytes;
143 if (pos + bytes > BACKLOG_SIZE) {
144 size_t to_copy = BACKLOG_SIZE - pos;
145 memcpy(stream->data + pos, data, to_copy);
151 memcpy(stream->data + pos, data, bytes);
152 wake_up_all_clients();
155 void Server::process_client(Client *client)
157 switch (client->state) {
158 case Client::READING_REQUEST: {
159 // Try to read more of the request.
161 int ret = read(client->sock, buf, sizeof(buf));
164 close_client(client);
168 // No data? This really means that we were triggered for something else than
169 // POLLIN (which suggests a logic error in epoll).
170 fprintf(stderr, "WARNING: fd %d returned unexpectedly 0 bytes!\n", client->sock);
171 close_client(client);
175 // Guard against overlong requests gobbling up all of our space.
176 if (client->request.size() + ret > MAX_CLIENT_REQUEST) {
177 fprintf(stderr, "WARNING: fd %d sent overlong request!\n", client->sock);
178 close_client(client);
182 // See if we have \r\n\r\n anywhere in the request. We start three bytes
183 // before what we just appended, in case we just got the final character.
184 size_t existing_req_bytes = client->request.size();
185 client->request.append(string(buf, buf + ret));
187 size_t start_at = (existing_req_bytes >= 3 ? existing_req_bytes - 3 : 0);
188 const char *ptr = reinterpret_cast<char *>(
189 memmem(client->request.data() + start_at, client->request.size() - start_at,
192 // OK, we don't have the entire header yet. Fine; we'll get it later.
196 if (ptr != client->request.data() + client->request.size() - 4) {
197 fprintf(stderr, "WARNING: fd %d had junk data after request!\n", client->sock);
198 close_client(client);
202 parse_request(client);
205 case Client::SENDING_HEADER: {
206 int ret = write(client->sock,
207 client->header.data() + client->header_bytes_sent,
208 client->header.size() - client->header_bytes_sent);
211 close_client(client);
215 client->header_bytes_sent += ret;
216 assert(client->header_bytes_sent <= client->header.size());
218 if (client->header_bytes_sent < client->header.size()) {
219 // We haven't sent all yet. Fine; we'll do that later.
223 // We're done sending the header! Clear the entire header to release some memory.
224 client->header.clear();
226 // Start sending from the end. In other words, we won't send any of the backlog,
227 // but we'll start sending immediately as we get data.
228 client->state = Client::SENDING_DATA;
229 client->bytes_sent = streams[client->stream_id].data_size;
232 case Client::SENDING_DATA: {
233 // See if there's some data we've lost. Ideally, we should drop to a block boundary,
234 // but resync will be the mux's problem.
235 const Stream &stream = streams[client->stream_id];
236 size_t bytes_to_send = stream.data_size - client->bytes_sent;
237 if (bytes_to_send > BACKLOG_SIZE) {
238 fprintf(stderr, "WARNING: fd %d lost %lld bytes, maybe too slow connection\n",
240 (long long int)(bytes_to_send - BACKLOG_SIZE));
241 client->bytes_sent = streams[client->stream_id].data_size - BACKLOG_SIZE;
242 bytes_to_send = BACKLOG_SIZE;
245 // See if we need to split across the circular buffer.
247 if ((client->bytes_sent % BACKLOG_SIZE) + bytes_to_send > BACKLOG_SIZE) {
248 size_t bytes_first_part = BACKLOG_SIZE - (client->bytes_sent % BACKLOG_SIZE);
251 iov[0].iov_base = const_cast<char *>(stream.data + (client->bytes_sent % BACKLOG_SIZE));
252 iov[0].iov_len = bytes_first_part;
254 iov[1].iov_base = const_cast<char *>(stream.data);
255 iov[1].iov_len = bytes_to_send - bytes_first_part;
257 ret = writev(client->sock, iov, 2);
259 ret = write(client->sock,
260 stream.data + (client->bytes_sent % BACKLOG_SIZE),
264 perror("write/writev");
265 close_client(client);
268 client->bytes_sent += ret;
270 if (client->bytes_sent == stream.data_size) {
271 // We don't have any more data for this client, so put it to sleep.
272 put_client_to_sleep(client);
281 void Server::parse_request(Client *client)
283 // TODO: Actually parse the request. :-)
284 client->stream_id = "stream";
285 client->request.clear();
287 // Construct the header.
288 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" +
289 streams[client->stream_id].header;
292 client->state = Client::SENDING_HEADER;
295 ev.events = EPOLLOUT | EPOLLRDHUP;
296 ev.data.fd = client->sock;
298 if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
299 perror("epoll_ctl(EPOLL_CTL_MOD)");
304 void Server::close_client(Client *client)
306 if (epoll_ctl(epoll_fd, EPOLL_CTL_DEL, client->sock, NULL) == -1) {
307 perror("epoll_ctl(EPOLL_CTL_DEL)");
311 // This client could be sleeping, so we'll need to fix that. (Argh, O(n).)
312 vector<int>::iterator new_end =
313 remove(sleeping_clients.begin(), sleeping_clients.end(), client->sock);
314 sleeping_clients.erase(new_end, sleeping_clients.end());
318 clients.erase(client->sock);
321 void Server::put_client_to_sleep(Client *client)
324 ev.events = EPOLLRDHUP;
325 ev.data.fd = client->sock;
327 if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
328 perror("epoll_ctl(EPOLL_CTL_MOD)");
332 sleeping_clients.push_back(client->sock);
335 void Server::wake_up_all_clients()
337 for (unsigned i = 0; i < sleeping_clients.size(); ++i) {
339 ev.events = EPOLLOUT | EPOLLRDHUP;
340 ev.data.fd = sleeping_clients[i];
341 if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, sleeping_clients[i], &ev) == -1) {
342 perror("epoll_ctl(EPOLL_CTL_MOD)");
346 sleeping_clients.clear();