7 #include <sys/socket.h>
10 #include <sys/ioctl.h>
11 #include <sys/epoll.h>
20 #include "mutexlock.h"
26 Client::Client(int sock)
28 state(Client::READING_REQUEST),
29 header_or_error_bytes_sent(0),
32 request.reserve(1024);
35 Client::Client(const ClientProto &serialized)
36 : sock(serialized.sock()),
37 state(State(serialized.state())),
38 request(serialized.request()),
39 stream_id(serialized.stream_id()),
40 header_or_error(serialized.header_or_error()),
41 header_or_error_bytes_sent(serialized.header_or_error_bytes_sent()),
42 bytes_sent(serialized.bytes_sent())
46 ClientProto Client::serialize() const
48 ClientProto serialized;
49 serialized.set_sock(sock);
50 serialized.set_state(state);
51 serialized.set_request(request);
52 serialized.set_stream_id(stream_id);
53 serialized.set_header_or_error(header_or_error);
54 serialized.set_header_or_error_bytes_sent(serialized.header_or_error_bytes_sent());
55 serialized.set_bytes_sent(bytes_sent);
59 Stream::Stream(const string &stream_id)
60 : stream_id(stream_id),
61 data(new char[BACKLOG_SIZE]),
64 memset(data, 0, BACKLOG_SIZE);
72 Stream::Stream(const StreamProto &serialized)
73 : stream_id(serialized.stream_id()),
74 header(serialized.header()),
75 data(new char[BACKLOG_SIZE]),
76 data_size(serialized.data_size())
78 assert(serialized.data().size() == BACKLOG_SIZE);
79 memcpy(data, serialized.data().data(), BACKLOG_SIZE);
82 StreamProto Stream::serialize() const
84 StreamProto serialized;
85 serialized.set_header(header);
86 serialized.set_data(string(data, data + BACKLOG_SIZE));
87 serialized.set_data_size(data_size);
88 serialized.set_stream_id(stream_id);
94 pthread_mutex_init(&mutex, NULL);
96 epoll_fd = epoll_create(1024); // Size argument is ignored.
112 // Joinable is already the default, but it's good to be certain.
114 pthread_attr_init(&attr);
115 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
116 pthread_create(&worker_thread, &attr, Server::do_work_thunk, this);
122 MutexLock lock(&mutex);
126 if (pthread_join(worker_thread, NULL) == -1) {
127 perror("pthread_join");
132 void *Server::do_work_thunk(void *arg)
134 Server *server = static_cast<Server *>(arg);
139 void Server::do_work()
142 int nfds = epoll_wait(epoll_fd, events, EPOLL_MAX_EVENTS, EPOLL_TIMEOUT_MS);
144 perror("epoll_wait");
148 MutexLock lock(&mutex); // We release the mutex between iterations.
154 for (int i = 0; i < nfds; ++i) {
155 int fd = events[i].data.fd;
156 assert(clients.count(fd) != 0);
157 Client *client = &clients[fd];
159 if (events[i].events & (EPOLLERR | EPOLLRDHUP | EPOLLHUP)) {
160 close_client(client);
164 process_client(client);
169 CubemapStateProto Server::serialize() const
171 CubemapStateProto serialized;
172 for (map<int, Client>::const_iterator client_it = clients.begin();
173 client_it != clients.end();
175 serialized.add_clients()->MergeFrom(client_it->second.serialize());
177 for (map<string, Stream *>::const_iterator stream_it = streams.begin();
178 stream_it != streams.end();
180 serialized.add_streams()->MergeFrom(stream_it->second->serialize());
185 void Server::add_client(int sock)
187 MutexLock lock(&mutex);
188 clients.insert(make_pair(sock, Client(sock)));
190 // Start listening on data from this socket.
192 ev.events = EPOLLIN | EPOLLRDHUP;
193 ev.data.u64 = 0; // Keep Valgrind happy.
195 if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, sock, &ev) == -1) {
196 perror("epoll_ctl(EPOLL_CTL_ADD)");
201 void Server::add_client_from_serialized(const ClientProto &client)
203 MutexLock lock(&mutex);
204 clients.insert(make_pair(client.sock(), Client(client)));
206 // Start listening on data from this socket.
208 if (client.state() == Client::READING_REQUEST) {
209 ev.events = EPOLLIN | EPOLLRDHUP;
211 // If we don't have more data for this client, we'll be putting it into
212 // the sleeping array again soon.
213 ev.events = EPOLLOUT | EPOLLRDHUP;
215 ev.data.u64 = 0; // Keep Valgrind happy.
216 ev.data.fd = client.sock();
217 if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, client.sock(), &ev) == -1) {
218 perror("epoll_ctl(EPOLL_CTL_ADD)");
223 void Server::add_stream(const string &stream_id)
225 MutexLock lock(&mutex);
226 streams.insert(make_pair(stream_id, new Stream(stream_id)));
229 void Server::add_stream_from_serialized(const StreamProto &stream)
231 MutexLock lock(&mutex);
232 streams.insert(make_pair(stream.stream_id(), new Stream(stream)));
235 void Server::set_header(const string &stream_id, const string &header)
237 MutexLock lock(&mutex);
238 find_stream(stream_id)->header = header;
240 // If there are clients we haven't sent anything to yet, we should give
241 // them the header, so push back into the SENDING_HEADER state.
242 for (map<int, Client>::iterator client_it = clients.begin();
243 client_it != clients.end();
245 Client *client = &client_it->second;
246 if (client->state == Client::SENDING_DATA &&
247 client->bytes_sent == 0) {
248 construct_header(client);
253 void Server::add_data(const string &stream_id, const char *data, size_t bytes)
259 MutexLock lock(&mutex);
260 Stream *stream = find_stream(stream_id);
261 size_t pos = stream->data_size % BACKLOG_SIZE;
262 stream->data_size += bytes;
264 if (pos + bytes > BACKLOG_SIZE) {
265 size_t to_copy = BACKLOG_SIZE - pos;
266 memcpy(stream->data + pos, data, to_copy);
272 memcpy(stream->data + pos, data, bytes);
273 wake_up_all_clients();
276 void Server::process_client(Client *client)
278 switch (client->state) {
279 case Client::READING_REQUEST: {
280 // Try to read more of the request.
282 int ret = read(client->sock, buf, sizeof(buf));
285 close_client(client);
289 // No data? This really means that we were triggered for something else than
290 // POLLIN (which suggests a logic error in epoll).
291 fprintf(stderr, "WARNING: fd %d returned unexpectedly 0 bytes!\n", client->sock);
292 close_client(client);
296 // Guard against overlong requests gobbling up all of our space.
297 if (client->request.size() + ret > MAX_CLIENT_REQUEST) {
298 fprintf(stderr, "WARNING: fd %d sent overlong request!\n", client->sock);
299 close_client(client);
303 // See if we have \r\n\r\n anywhere in the request. We start three bytes
304 // before what we just appended, in case we just got the final character.
305 size_t existing_req_bytes = client->request.size();
306 client->request.append(string(buf, buf + ret));
308 size_t start_at = (existing_req_bytes >= 3 ? existing_req_bytes - 3 : 0);
309 const char *ptr = reinterpret_cast<char *>(
310 memmem(client->request.data() + start_at, client->request.size() - start_at,
313 // OK, we don't have the entire header yet. Fine; we'll get it later.
317 if (ptr != client->request.data() + client->request.size() - 4) {
318 fprintf(stderr, "WARNING: fd %d had junk data after request!\n", client->sock);
319 close_client(client);
323 int error_code = parse_request(client);
324 if (error_code == 200) {
325 construct_header(client);
327 construct_error(client, error_code);
331 case Client::SENDING_ERROR:
332 case Client::SENDING_HEADER: {
333 int ret = write(client->sock,
334 client->header_or_error.data() + client->header_or_error_bytes_sent,
335 client->header_or_error.size() - client->header_or_error_bytes_sent);
338 close_client(client);
342 client->header_or_error_bytes_sent += ret;
343 assert(client->header_or_error_bytes_sent <= client->header_or_error.size());
345 if (client->header_or_error_bytes_sent < client->header_or_error.size()) {
346 // We haven't sent all yet. Fine; we'll do that later.
350 // We're done sending the header or error! Clear it to release some memory.
351 client->header_or_error.clear();
353 if (client->state == Client::SENDING_ERROR) {
354 close_client(client);
356 // Start sending from the end. In other words, we won't send any of the backlog,
357 // but we'll start sending immediately as we get data.
358 client->state = Client::SENDING_DATA;
359 client->bytes_sent = find_stream(client->stream_id)->data_size;
363 case Client::SENDING_DATA: {
364 // See if there's some data we've lost. Ideally, we should drop to a block boundary,
365 // but resync will be the mux's problem.
366 const Stream &stream = *find_stream(client->stream_id);
367 size_t bytes_to_send = stream.data_size - client->bytes_sent;
368 if (bytes_to_send > BACKLOG_SIZE) {
369 fprintf(stderr, "WARNING: fd %d lost %lld bytes, maybe too slow connection\n",
371 (long long int)(bytes_to_send - BACKLOG_SIZE));
372 client->bytes_sent = find_stream(client->stream_id)->data_size - BACKLOG_SIZE;
373 bytes_to_send = BACKLOG_SIZE;
376 // See if we need to split across the circular buffer.
378 if ((client->bytes_sent % BACKLOG_SIZE) + bytes_to_send > BACKLOG_SIZE) {
379 size_t bytes_first_part = BACKLOG_SIZE - (client->bytes_sent % BACKLOG_SIZE);
382 iov[0].iov_base = const_cast<char *>(stream.data + (client->bytes_sent % BACKLOG_SIZE));
383 iov[0].iov_len = bytes_first_part;
385 iov[1].iov_base = const_cast<char *>(stream.data);
386 iov[1].iov_len = bytes_to_send - bytes_first_part;
388 ret = writev(client->sock, iov, 2);
390 ret = write(client->sock,
391 stream.data + (client->bytes_sent % BACKLOG_SIZE),
395 perror("write/writev");
396 close_client(client);
399 client->bytes_sent += ret;
401 if (client->bytes_sent == stream.data_size) {
402 // We don't have any more data for this client, so put it to sleep.
403 put_client_to_sleep(client);
412 int Server::parse_request(Client *client)
414 vector<string> lines = split_lines(client->request);
416 return 400; // Bad request (empty).
419 vector<string> request_tokens = split_tokens(lines[0]);
420 if (request_tokens.size() < 2) {
421 return 400; // Bad request (empty).
423 if (request_tokens[0] != "GET") {
424 return 400; // Should maybe be 405 instead?
426 if (streams.count(request_tokens[1]) == 0) {
427 return 404; // Not found.
430 client->stream_id = request_tokens[1];
431 client->request.clear();
436 void Server::construct_header(Client *client)
438 client->header_or_error = "HTTP/1.0 200 OK\r\nContent-type: video/x-flv\r\nCache-Control: no-cache\r\n\r\n" +
439 find_stream(client->stream_id)->header;
442 client->state = Client::SENDING_HEADER;
445 ev.events = EPOLLOUT | EPOLLRDHUP;
446 ev.data.u64 = 0; // Keep Valgrind happy.
447 ev.data.fd = client->sock;
449 if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
450 perror("epoll_ctl(EPOLL_CTL_MOD)");
455 void Server::construct_error(Client *client, int error_code)
458 snprintf(error, 256, "HTTP/1.0 %d Error\r\nContent-type: text/plain\r\n\r\nSomething went wrong. Sorry.\r\n",
460 client->header_or_error = error;
463 client->state = Client::SENDING_ERROR;
466 ev.events = EPOLLOUT | EPOLLRDHUP;
467 ev.data.u64 = 0; // Keep Valgrind happy.
468 ev.data.fd = client->sock;
470 if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
471 perror("epoll_ctl(EPOLL_CTL_MOD)");
476 void Server::close_client(Client *client)
478 if (epoll_ctl(epoll_fd, EPOLL_CTL_DEL, client->sock, NULL) == -1) {
479 perror("epoll_ctl(EPOLL_CTL_DEL)");
483 // This client could be sleeping, so we'll need to fix that. (Argh, O(n).)
484 vector<int>::iterator new_end =
485 remove(sleeping_clients.begin(), sleeping_clients.end(), client->sock);
486 sleeping_clients.erase(new_end, sleeping_clients.end());
490 clients.erase(client->sock);
493 void Server::put_client_to_sleep(Client *client)
496 ev.events = EPOLLRDHUP;
497 ev.data.u64 = 0; // Keep Valgrind happy.
498 ev.data.fd = client->sock;
500 if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
501 perror("epoll_ctl(EPOLL_CTL_MOD)");
505 sleeping_clients.push_back(client->sock);
508 void Server::wake_up_all_clients()
510 for (unsigned i = 0; i < sleeping_clients.size(); ++i) {
512 ev.events = EPOLLOUT | EPOLLRDHUP;
513 ev.data.u64 = 0; // Keep Valgrind happy.
514 ev.data.fd = sleeping_clients[i];
515 if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, sleeping_clients[i], &ev) == -1) {
516 perror("epoll_ctl(EPOLL_CTL_MOD)");
520 sleeping_clients.clear();
523 Stream *Server::find_stream(const string &stream_id)
525 map<string, Stream *>::iterator it = streams.find(stream_id);
526 assert(it != streams.end());