7 #include <sys/socket.h>
10 #include <sys/ioctl.h>
11 #include <sys/epoll.h>
20 #include "mutexlock.h"
25 Client::Client(int sock)
26 : state(Client::READING_REQUEST),
30 request.reserve(1024);
33 Client::Client(const ClientProto &serialized)
34 : sock(serialized.sock()),
35 state(State(serialized.state())),
36 request(serialized.request()),
37 stream_id(serialized.stream_id()),
38 header(serialized.header()),
39 header_bytes_sent(serialized.header_bytes_sent()),
40 bytes_sent(serialized.bytes_sent())
44 ClientProto Client::serialize() const
46 ClientProto serialized;
47 serialized.set_sock(sock);
48 serialized.set_state(state);
49 serialized.set_request(request);
50 serialized.set_stream_id(stream_id);
51 serialized.set_header(header);
52 serialized.set_header_bytes_sent(serialized.header_bytes_sent());
53 serialized.set_bytes_sent(bytes_sent);
59 pthread_mutex_init(&mutex, NULL);
61 epoll_fd = epoll_create(1024); // Size argument is ignored.
72 // Joinable is already the default, but it's good to be certain.
74 pthread_attr_init(&attr);
75 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
76 pthread_create(&worker_thread, &attr, Server::do_work_thunk, this);
82 MutexLock lock(&mutex);
86 if (pthread_join(worker_thread, NULL) == -1) {
87 perror("pthread_join");
92 void *Server::do_work_thunk(void *arg)
94 Server *server = static_cast<Server *>(arg);
99 void Server::do_work()
102 int nfds = epoll_wait(epoll_fd, events, EPOLL_MAX_EVENTS, EPOLL_TIMEOUT_MS);
104 perror("epoll_wait");
108 MutexLock lock(&mutex); // We release the mutex between iterations.
114 for (int i = 0; i < nfds; ++i) {
115 int fd = events[i].data.fd;
116 assert(clients.count(fd) != 0);
117 Client *client = &clients[fd];
119 if (events[i].events & (EPOLLERR | EPOLLRDHUP | EPOLLHUP)) {
120 close_client(client);
124 process_client(client);
129 void Server::add_client(int sock)
131 MutexLock lock(&mutex);
132 clients.insert(make_pair(sock, Client(sock)));
134 // Start listening on data from this socket.
136 ev.events = EPOLLIN | EPOLLRDHUP;
138 if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, sock, &ev) == -1) {
139 perror("epoll_ctl(EPOLL_CTL_ADD)");
144 void Server::add_stream(const string &stream_id)
146 MutexLock lock(&mutex);
147 streams.insert(make_pair(stream_id, Stream()));
150 void Server::set_header(const string &stream_id, const string &header)
152 MutexLock lock(&mutex);
153 assert(streams.count(stream_id) != 0);
154 streams[stream_id].header = header;
157 void Server::add_data(const string &stream_id, const char *data, size_t bytes)
163 MutexLock lock(&mutex);
164 assert(streams.count(stream_id) != 0);
165 Stream *stream = &streams[stream_id];
166 size_t pos = stream->data_size % BACKLOG_SIZE;
167 stream->data_size += bytes;
169 if (pos + bytes > BACKLOG_SIZE) {
170 size_t to_copy = BACKLOG_SIZE - pos;
171 memcpy(stream->data + pos, data, to_copy);
177 memcpy(stream->data + pos, data, bytes);
178 wake_up_all_clients();
181 void Server::process_client(Client *client)
183 switch (client->state) {
184 case Client::READING_REQUEST: {
185 // Try to read more of the request.
187 int ret = read(client->sock, buf, sizeof(buf));
190 close_client(client);
194 // No data? This really means that we were triggered for something else than
195 // POLLIN (which suggests a logic error in epoll).
196 fprintf(stderr, "WARNING: fd %d returned unexpectedly 0 bytes!\n", client->sock);
197 close_client(client);
201 // Guard against overlong requests gobbling up all of our space.
202 if (client->request.size() + ret > MAX_CLIENT_REQUEST) {
203 fprintf(stderr, "WARNING: fd %d sent overlong request!\n", client->sock);
204 close_client(client);
208 // See if we have \r\n\r\n anywhere in the request. We start three bytes
209 // before what we just appended, in case we just got the final character.
210 size_t existing_req_bytes = client->request.size();
211 client->request.append(string(buf, buf + ret));
213 size_t start_at = (existing_req_bytes >= 3 ? existing_req_bytes - 3 : 0);
214 const char *ptr = reinterpret_cast<char *>(
215 memmem(client->request.data() + start_at, client->request.size() - start_at,
218 // OK, we don't have the entire header yet. Fine; we'll get it later.
222 if (ptr != client->request.data() + client->request.size() - 4) {
223 fprintf(stderr, "WARNING: fd %d had junk data after request!\n", client->sock);
224 close_client(client);
228 parse_request(client);
231 case Client::SENDING_HEADER: {
232 int ret = write(client->sock,
233 client->header.data() + client->header_bytes_sent,
234 client->header.size() - client->header_bytes_sent);
237 close_client(client);
241 client->header_bytes_sent += ret;
242 assert(client->header_bytes_sent <= client->header.size());
244 if (client->header_bytes_sent < client->header.size()) {
245 // We haven't sent all yet. Fine; we'll do that later.
249 // We're done sending the header! Clear the entire header to release some memory.
250 client->header.clear();
252 // Start sending from the end. In other words, we won't send any of the backlog,
253 // but we'll start sending immediately as we get data.
254 client->state = Client::SENDING_DATA;
255 client->bytes_sent = streams[client->stream_id].data_size;
258 case Client::SENDING_DATA: {
259 // See if there's some data we've lost. Ideally, we should drop to a block boundary,
260 // but resync will be the mux's problem.
261 const Stream &stream = streams[client->stream_id];
262 size_t bytes_to_send = stream.data_size - client->bytes_sent;
263 if (bytes_to_send > BACKLOG_SIZE) {
264 fprintf(stderr, "WARNING: fd %d lost %lld bytes, maybe too slow connection\n",
266 (long long int)(bytes_to_send - BACKLOG_SIZE));
267 client->bytes_sent = streams[client->stream_id].data_size - BACKLOG_SIZE;
268 bytes_to_send = BACKLOG_SIZE;
271 // See if we need to split across the circular buffer.
273 if ((client->bytes_sent % BACKLOG_SIZE) + bytes_to_send > BACKLOG_SIZE) {
274 size_t bytes_first_part = BACKLOG_SIZE - (client->bytes_sent % BACKLOG_SIZE);
277 iov[0].iov_base = const_cast<char *>(stream.data + (client->bytes_sent % BACKLOG_SIZE));
278 iov[0].iov_len = bytes_first_part;
280 iov[1].iov_base = const_cast<char *>(stream.data);
281 iov[1].iov_len = bytes_to_send - bytes_first_part;
283 ret = writev(client->sock, iov, 2);
285 ret = write(client->sock,
286 stream.data + (client->bytes_sent % BACKLOG_SIZE),
290 perror("write/writev");
291 close_client(client);
294 client->bytes_sent += ret;
296 if (client->bytes_sent == stream.data_size) {
297 // We don't have any more data for this client, so put it to sleep.
298 put_client_to_sleep(client);
307 void Server::parse_request(Client *client)
309 // TODO: Actually parse the request. :-)
310 client->stream_id = "stream";
311 client->request.clear();
313 // Construct the header.
314 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" +
315 streams[client->stream_id].header;
318 client->state = Client::SENDING_HEADER;
321 ev.events = EPOLLOUT | EPOLLRDHUP;
322 ev.data.fd = client->sock;
324 if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
325 perror("epoll_ctl(EPOLL_CTL_MOD)");
330 void Server::close_client(Client *client)
332 if (epoll_ctl(epoll_fd, EPOLL_CTL_DEL, client->sock, NULL) == -1) {
333 perror("epoll_ctl(EPOLL_CTL_DEL)");
337 // This client could be sleeping, so we'll need to fix that. (Argh, O(n).)
338 vector<int>::iterator new_end =
339 remove(sleeping_clients.begin(), sleeping_clients.end(), client->sock);
340 sleeping_clients.erase(new_end, sleeping_clients.end());
344 clients.erase(client->sock);
347 void Server::put_client_to_sleep(Client *client)
350 ev.events = EPOLLRDHUP;
351 ev.data.fd = client->sock;
353 if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
354 perror("epoll_ctl(EPOLL_CTL_MOD)");
358 sleeping_clients.push_back(client->sock);
361 void Server::wake_up_all_clients()
363 for (unsigned i = 0; i < sleeping_clients.size(); ++i) {
365 ev.events = EPOLLOUT | EPOLLRDHUP;
366 ev.data.fd = sleeping_clients[i];
367 if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, sleeping_clients[i], &ev) == -1) {
368 perror("epoll_ctl(EPOLL_CTL_MOD)");
372 sleeping_clients.clear();