3 #include <netinet/in.h>
10 #include <sys/sendfile.h>
11 #include <sys/socket.h>
12 #include <sys/types.h>
23 #include "accesslog.h"
25 #include "metacube2.h"
32 #ifndef SO_MAX_PACING_RATE
33 #define SO_MAX_PACING_RATE 47
38 extern AccessLogThread *access_log;
42 inline bool is_equal(timespec a, timespec b)
44 return a.tv_sec == b.tv_sec &&
45 a.tv_nsec == b.tv_nsec;
48 inline bool is_earlier(timespec a, timespec b)
50 if (a.tv_sec != b.tv_sec)
51 return a.tv_sec < b.tv_sec;
52 return a.tv_nsec < b.tv_nsec;
59 epoll_fd = epoll_create(1024); // Size argument is ignored.
61 log_perror("epoll_fd");
71 vector<ClientStats> Server::get_client_stats() const
73 vector<ClientStats> ret;
75 lock_guard<mutex> lock(mu);
76 for (const auto &fd_and_client : clients) {
77 ret.push_back(fd_and_client.second.get_stats());
82 void Server::do_work()
84 while (!should_stop()) {
85 // Wait until there's activity on at least one of the fds,
86 // or 20 ms (about one frame at 50 fps) has elapsed.
88 // We could in theory wait forever and rely on wakeup()
89 // from add_client_deferred() and add_data_deferred(),
90 // but wakeup is a pretty expensive operation, and the
91 // two threads might end up fighting over a lock, so it's
92 // seemingly (much) more efficient to just have a timeout here.
93 int nfds = epoll_pwait(epoll_fd, events, EPOLL_MAX_EVENTS, EPOLL_TIMEOUT_MS, &sigset_without_usr1_block);
94 if (nfds == -1 && errno != EINTR) {
95 log_perror("epoll_wait");
99 lock_guard<mutex> lock(mu); // We release the mutex between iterations.
101 process_queued_data();
103 // Process each client where we have socket activity.
104 for (int i = 0; i < nfds; ++i) {
105 Client *client = reinterpret_cast<Client *>(events[i].data.ptr);
107 if (events[i].events & (EPOLLERR | EPOLLRDHUP | EPOLLHUP)) {
108 close_client(client);
112 process_client(client);
115 // Process each client where its stream has new data,
116 // even if there was no socket activity.
117 for (unique_ptr<Stream> &stream : streams) {
118 vector<Client *> to_process;
119 swap(stream->to_process, to_process);
120 for (Client *client : to_process) {
121 process_client(client);
125 // Finally, go through each client to see if it's timed out
126 // in the READING_REQUEST state. (Seemingly there are clients
127 // that can hold sockets up for days at a time without sending
129 timespec timeout_time;
130 if (clock_gettime(CLOCK_MONOTONIC_COARSE, &timeout_time) == -1) {
131 log_perror("clock_gettime(CLOCK_MONOTONIC_COARSE)");
134 timeout_time.tv_sec -= REQUEST_READ_TIMEOUT_SEC;
135 while (!clients_ordered_by_connect_time.empty()) {
136 const pair<timespec, int> &connect_time_and_fd = clients_ordered_by_connect_time.front();
138 // See if we have reached the end of clients to process.
139 if (is_earlier(timeout_time, connect_time_and_fd.first)) {
143 // If this client doesn't exist anymore, just ignore it
144 // (it was deleted earlier).
145 auto client_it = clients.find(connect_time_and_fd.second);
146 if (client_it == clients.end()) {
147 clients_ordered_by_connect_time.pop();
150 Client *client = &client_it->second;
151 if (!is_equal(client->connect_time, connect_time_and_fd.first)) {
152 // Another client has taken this fd in the meantime.
153 clients_ordered_by_connect_time.pop();
157 if (client->state != Client::READING_REQUEST) {
158 // Only READING_REQUEST can time out.
159 clients_ordered_by_connect_time.pop();
164 close_client(client);
165 clients_ordered_by_connect_time.pop();
170 CubemapStateProto Server::serialize(unordered_map<const string *, size_t> *short_response_pool)
172 // We don't serialize anything queued, so empty the queues.
173 process_queued_data();
175 // Set all clients in a consistent state before serializing
176 // (ie., they have no remaining lost data). Otherwise, increasing
177 // the backlog could take clients into a newly valid area of the backlog,
178 // sending a stream of zeros instead of skipping the data as it should.
180 // TODO: Do this when clients are added back from serialized state instead;
181 // it would probably be less wasteful.
182 for (auto &fd_and_client : clients) {
183 skip_lost_data(&fd_and_client.second);
186 CubemapStateProto serialized;
187 for (const auto &fd_and_client : clients) {
188 serialized.add_clients()->MergeFrom(fd_and_client.second.serialize(short_response_pool));
190 for (unique_ptr<Stream> &stream : streams) {
191 serialized.add_streams()->MergeFrom(stream->serialize());
196 void Server::add_client_deferred(int sock, Acceptor *acceptor)
198 lock_guard<mutex> lock(queued_clients_mutex);
199 queued_add_clients.push_back(std::make_pair(sock, acceptor));
202 void Server::add_client(int sock, Acceptor *acceptor)
204 const bool is_tls = acceptor->is_tls();
205 auto inserted = clients.insert(make_pair(sock, Client(sock)));
206 assert(inserted.second == true); // Should not already exist.
207 Client *client_ptr = &inserted.first->second;
209 // Connection timestamps must be nondecreasing. I can't find any guarantee
210 // that even the monotonic clock can't go backwards by a small amount
211 // (think switching between CPUs with non-synchronized TSCs), so if
212 // this actually should happen, we hack around it by fudging
214 if (!clients_ordered_by_connect_time.empty() &&
215 is_earlier(client_ptr->connect_time, clients_ordered_by_connect_time.back().first)) {
216 client_ptr->connect_time = clients_ordered_by_connect_time.back().first;
218 clients_ordered_by_connect_time.push(make_pair(client_ptr->connect_time, sock));
220 // Start listening on data from this socket.
223 // Even in the initial state (READING_REQUEST), TLS needs to
224 // send data for the handshake, and thus might end up needing
225 // to know about EPOLLOUT.
226 ev.events = EPOLLIN | EPOLLOUT | EPOLLET | EPOLLRDHUP;
228 // EPOLLOUT will be added once we go out of READING_REQUEST.
229 ev.events = EPOLLIN | EPOLLET | EPOLLRDHUP;
231 ev.data.ptr = client_ptr;
232 if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, sock, &ev) == -1) {
233 log_perror("epoll_ctl(EPOLL_CTL_ADD)");
238 assert(tls_server_contexts.count(acceptor));
239 client_ptr->tls_context = tls_accept(tls_server_contexts[acceptor]);
240 if (client_ptr->tls_context == nullptr) {
241 log(ERROR, "tls_accept() failed");
242 close_client(client_ptr);
245 tls_make_exportable(client_ptr->tls_context, 1);
248 process_client(client_ptr);
251 void Server::add_client_from_serialized(const ClientProto &client, const vector<shared_ptr<const string>> &short_responses)
253 lock_guard<mutex> lock(mu);
255 int stream_index = lookup_stream_by_url(client.url());
256 if (stream_index == -1) {
257 assert(client.state() != Client::SENDING_DATA);
260 stream = streams[stream_index].get();
262 auto inserted = clients.insert(make_pair(client.sock(), Client(client, short_responses, stream)));
263 assert(inserted.second == true); // Should not already exist.
264 Client *client_ptr = &inserted.first->second;
266 // Connection timestamps must be nondecreasing.
267 assert(clients_ordered_by_connect_time.empty() ||
268 !is_earlier(client_ptr->connect_time, clients_ordered_by_connect_time.back().first));
269 clients_ordered_by_connect_time.push(make_pair(client_ptr->connect_time, client.sock()));
271 // Start listening on data from this socket.
273 if (client.state() == Client::READING_REQUEST) {
274 // See the corresponding comment in Server::add_client().
275 if (client.has_tls_context()) {
276 ev.events = EPOLLIN | EPOLLOUT | EPOLLET | EPOLLRDHUP;
278 ev.events = EPOLLIN | EPOLLET | EPOLLRDHUP;
281 // If we don't have more data for this client, we'll be putting it into
282 // the sleeping array again soon.
283 ev.events = EPOLLOUT | EPOLLET | EPOLLRDHUP;
285 ev.data.ptr = client_ptr;
286 if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, client.sock(), &ev) == -1) {
287 log_perror("epoll_ctl(EPOLL_CTL_ADD)");
291 if (client_ptr->state == Client::WAITING_FOR_KEYFRAME ||
292 client_ptr->state == Client::PREBUFFERING ||
293 (client_ptr->state == Client::SENDING_DATA &&
294 client_ptr->stream_pos == client_ptr->stream->bytes_received)) {
295 client_ptr->stream->put_client_to_sleep(client_ptr);
297 process_client(client_ptr);
301 int Server::lookup_stream_by_url(const string &url) const
303 map<string, int>::const_iterator stream_url_it = stream_url_map.find(url);
304 if (stream_url_it == stream_url_map.end()) {
307 return stream_url_it->second;
310 int Server::add_stream(const string &url, size_t backlog_size, size_t prebuffering_bytes, Stream::Encoding encoding, Stream::Encoding src_encoding)
312 lock_guard<mutex> lock(mu);
313 stream_url_map.insert(make_pair(url, streams.size()));
314 streams.emplace_back(new Stream(url, backlog_size, prebuffering_bytes, encoding, src_encoding));
315 return streams.size() - 1;
318 int Server::add_stream_from_serialized(const StreamProto &stream, int data_fd)
320 lock_guard<mutex> lock(mu);
321 stream_url_map.insert(make_pair(stream.url(), streams.size()));
322 streams.emplace_back(new Stream(stream, data_fd));
323 return streams.size() - 1;
326 void Server::set_backlog_size(int stream_index, size_t new_size)
328 lock_guard<mutex> lock(mu);
329 assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
330 streams[stream_index]->set_backlog_size(new_size);
333 void Server::set_prebuffering_bytes(int stream_index, size_t new_amount)
335 lock_guard<mutex> lock(mu);
336 assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
337 streams[stream_index]->prebuffering_bytes = new_amount;
340 void Server::set_encoding(int stream_index, Stream::Encoding encoding)
342 lock_guard<mutex> lock(mu);
343 assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
344 streams[stream_index]->encoding = encoding;
347 void Server::set_src_encoding(int stream_index, Stream::Encoding encoding)
349 lock_guard<mutex> lock(mu);
350 assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
351 streams[stream_index]->src_encoding = encoding;
354 void Server::set_header(int stream_index, const string &http_header, const string &stream_header)
356 lock_guard<mutex> lock(mu);
357 assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
358 streams[stream_index]->http_header = http_header;
360 if (stream_header != streams[stream_index]->stream_header) {
361 // We cannot start at any of the older starting points anymore,
362 // since they'd get the wrong header for the stream (not to mention
363 // that a changed header probably means the stream restarted,
364 // which means any client starting on the old one would probably
365 // stop playing properly at the change point). Next block
366 // should be a suitable starting point (if not, something is
367 // pretty strange), so it will fill up again soon enough.
368 streams[stream_index]->suitable_starting_points.clear();
370 streams[stream_index]->stream_header = stream_header;
373 void Server::set_pacing_rate(int stream_index, uint32_t pacing_rate)
375 lock_guard<mutex> lock(mu);
376 assert(clients.empty());
377 assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
378 streams[stream_index]->pacing_rate = pacing_rate;
381 void Server::add_gen204(const std::string &url, const std::string &allow_origin)
383 lock_guard<mutex> lock(mu);
384 assert(clients.empty());
385 ping_url_map[url] = allow_origin;
388 void Server::create_tls_context_for_acceptor(const Acceptor *acceptor)
390 assert(acceptor->is_tls());
392 bool is_server = true;
393 TLSContext *server_context = tls_create_context(is_server, TLS_V12);
395 const string &cert = acceptor->get_certificate_chain();
396 int num_cert = tls_load_certificates(server_context, reinterpret_cast<const unsigned char *>(cert.data()), cert.size());
397 assert(num_cert > 0); // Should have been checked by config earlier.
399 const string &key = acceptor->get_private_key();
400 int num_key = tls_load_private_key(server_context, reinterpret_cast<const unsigned char *>(key.data()), key.size());
401 assert(num_key > 0); // Should have been checked by config earlier.
403 tls_server_contexts.insert(make_pair(acceptor, server_context));
406 void Server::add_data_deferred(int stream_index, const char *data, size_t bytes, uint16_t metacube_flags)
408 assert(stream_index >= 0 && stream_index < ssize_t(streams.size()));
409 streams[stream_index]->add_data_deferred(data, bytes, metacube_flags);
412 // See the .h file for postconditions after this function.
413 void Server::process_client(Client *client)
415 switch (client->state) {
416 case Client::READING_REQUEST: {
417 if (client->tls_context != nullptr) {
418 if (send_pending_tls_data(client)) {
419 // send_pending_tls_data() hit postconditions #1 or #4.
425 // Try to read more of the request.
428 if (client->tls_context == nullptr) {
429 ret = read_nontls_data(client, buf, sizeof(buf));
431 // read_nontls_data() hit postconditions #1 or #2.
435 ret = read_tls_data(client, buf, sizeof(buf));
437 // read_tls_data() hit postconditions #1, #2 or #4.
442 RequestParseStatus status = wait_for_double_newline(&client->request, buf, ret);
445 case RP_OUT_OF_SPACE:
446 log(WARNING, "[%s] Client sent overlong request!", client->remote_addr.c_str());
447 close_client(client);
449 case RP_NOT_FINISHED_YET:
450 // OK, we don't have the entire header yet. Fine; we'll get it later.
451 // See if there's more data for us.
452 goto read_request_again;
454 log(WARNING, "[%s] Junk data after request!", client->remote_addr.c_str());
455 close_client(client);
461 assert(status == RP_FINISHED);
463 if (client->tls_context && !client->in_ktls_mode && tls_established(client->tls_context)) {
464 // We're ready to enter kTLS mode, unless we still have some
465 // handshake data to send (which then must be sent as non-kTLS).
466 if (send_pending_tls_data(client)) {
467 // send_pending_tls_data() hit postconditions #1 or #4.
470 ret = tls_make_ktls(client->tls_context, client->sock);
472 log_tls_error("tls_make_ktls", ret);
473 close_client(client);
476 client->in_ktls_mode = true;
479 int error_code = parse_request(client);
480 if (error_code == 200) {
481 construct_header(client);
482 } else if (error_code == 204) {
483 construct_204(client);
485 construct_error(client, error_code);
488 // We've changed states, so fall through.
489 assert(client->state == Client::SENDING_SHORT_RESPONSE ||
490 client->state == Client::SENDING_HEADER);
492 case Client::SENDING_SHORT_RESPONSE:
493 case Client::SENDING_HEADER: {
494 sending_header_or_short_response_again:
497 ret = write(client->sock,
498 client->header_or_short_response->data() + client->header_or_short_response_bytes_sent,
499 client->header_or_short_response->size() - client->header_or_short_response_bytes_sent);
500 } while (ret == -1 && errno == EINTR);
502 if (ret == -1 && errno == EAGAIN) {
503 // We're out of socket space, so now we're at the “low edge” of epoll's
504 // edge triggering. epoll will tell us when there is more room, so for now,
506 // This is postcondition #4.
511 // Error! Postcondition #1.
513 close_client(client);
517 client->header_or_short_response_bytes_sent += ret;
518 assert(client->header_or_short_response_bytes_sent <= client->header_or_short_response->size());
520 if (client->header_or_short_response_bytes_sent < client->header_or_short_response->size()) {
521 // We haven't sent all yet. Fine; go another round.
522 goto sending_header_or_short_response_again;
525 // We're done sending the header or error! Clear it to release some memory.
526 client->header_or_short_response = nullptr;
527 client->header_or_short_response_holder.clear();
528 client->header_or_short_response_ref.reset();
530 if (client->state == Client::SENDING_SHORT_RESPONSE) {
531 if (more_requests(client)) {
532 // We're done sending the error, but should keep on reading new requests.
533 goto read_request_again;
535 // We're done sending the error, so now close.
536 // This is postcondition #1.
537 close_client(client);
542 Stream *stream = client->stream;
543 if (client->stream_pos == Client::STREAM_POS_AT_START) {
544 // Start sending from the beginning of the backlog.
545 client->stream_pos = min<size_t>(
546 stream->bytes_received - stream->backlog_size,
548 client->state = Client::SENDING_DATA;
550 } else if (client->stream_pos_end != Client::STREAM_POS_NO_END) {
551 // We're sending a fragment, and should have all of it,
552 // so start sending right away.
553 assert(client->stream_pos >= 0);
554 client->state = Client::SENDING_DATA;
556 } else if (stream->prebuffering_bytes == 0) {
557 // Start sending from the first keyframe we get. In other
558 // words, we won't send any of the backlog, but we'll start
559 // sending immediately as we get the next keyframe block.
560 // Note that this is functionally identical to the next if branch,
561 // except that we save a binary search.
562 assert(client->stream_pos == Client::STREAM_POS_AT_END);
563 assert(client->stream_pos_end == Client::STREAM_POS_NO_END);
564 client->stream_pos = stream->bytes_received;
565 client->state = Client::WAITING_FOR_KEYFRAME;
567 // We're not going to send anything to the client before we have
568 // N bytes. However, this wait might be boring; we can just as well
569 // use it to send older data if we have it. We use lower_bound()
570 // so that we are conservative and never add extra latency over just
571 // waiting (assuming CBR or nearly so); otherwise, we could want e.g.
572 // 100 kB prebuffer but end up sending a 10 MB GOP.
573 assert(client->stream_pos == Client::STREAM_POS_AT_END);
574 assert(client->stream_pos_end == Client::STREAM_POS_NO_END);
575 deque<size_t>::const_iterator starting_point_it =
576 lower_bound(stream->suitable_starting_points.begin(),
577 stream->suitable_starting_points.end(),
578 stream->bytes_received - stream->prebuffering_bytes);
579 if (starting_point_it == stream->suitable_starting_points.end()) {
580 // None found. Just put us at the end, and then wait for the
581 // first keyframe to appear.
582 client->stream_pos = stream->bytes_received;
583 client->state = Client::WAITING_FOR_KEYFRAME;
585 client->stream_pos = *starting_point_it;
586 client->state = Client::PREBUFFERING;
592 case Client::WAITING_FOR_KEYFRAME: {
593 Stream *stream = client->stream;
594 if (stream->suitable_starting_points.empty() ||
595 client->stream_pos > stream->suitable_starting_points.back()) {
596 // We haven't received a keyframe since this stream started waiting,
597 // so keep on waiting for one.
598 // This is postcondition #3.
599 stream->put_client_to_sleep(client);
602 client->stream_pos = stream->suitable_starting_points.back();
603 client->state = Client::PREBUFFERING;
606 case Client::PREBUFFERING: {
608 Stream *stream = client->stream;
609 size_t bytes_to_send = stream->bytes_received - client->stream_pos;
610 assert(bytes_to_send <= stream->backlog_size);
611 if (bytes_to_send < stream->prebuffering_bytes) {
612 // We don't have enough bytes buffered to start this client yet.
613 // This is postcondition #3.
614 stream->put_client_to_sleep(client);
617 client->state = Client::SENDING_DATA;
620 case Client::SENDING_DATA: {
622 skip_lost_data(client);
623 Stream *stream = client->stream;
626 size_t bytes_to_send;
627 if (client->stream_pos_end == Client::STREAM_POS_NO_END) {
628 bytes_to_send = stream->bytes_received - client->stream_pos;
630 bytes_to_send = client->stream_pos_end - client->stream_pos;
632 assert(bytes_to_send <= stream->backlog_size);
633 if (bytes_to_send == 0) {
634 if (client->stream_pos == client->stream_pos_end) { // We have a definite end, and we're at it.
635 if (more_requests(client)) {
636 // We're done sending the fragment, but should keep on reading new requests.
637 goto read_request_again;
639 // We're done sending the fragment, so now close.
640 // This is postcondition #1.
641 close_client(client);
647 // See if we need to split across the circular buffer.
648 bool more_data = false;
649 if ((client->stream_pos % stream->backlog_size) + bytes_to_send > stream->backlog_size) {
650 bytes_to_send = stream->backlog_size - (client->stream_pos % stream->backlog_size);
656 off_t offset = client->stream_pos % stream->backlog_size;
657 ret = sendfile(client->sock, stream->data_fd, &offset, bytes_to_send);
658 } while (ret == -1 && errno == EINTR);
660 if (ret == -1 && errno == EAGAIN) {
661 // We're out of socket space, so return; epoll will wake us up
662 // when there is more room.
663 // This is postcondition #4.
667 // Error, close; postcondition #1.
668 log_perror("sendfile");
669 close_client(client);
672 client->stream_pos += ret;
673 client->bytes_sent += ret;
675 assert(client->stream_pos_end == Client::STREAM_POS_NO_END || client->stream_pos <= client->stream_pos_end);
676 if (client->stream_pos == client->stream_pos_end) {
677 goto sending_data_again; // Will see that bytes_to_send == 0 and end.
678 } else if (client->stream_pos == stream->bytes_received) {
679 // We don't have any more data for this client, so put it to sleep.
680 // This is postcondition #3.
681 stream->put_client_to_sleep(client);
682 } else if (more_data && size_t(ret) == bytes_to_send) {
683 goto sending_data_again;
685 // We'll also get here for postcondition #4 (similar to the EAGAIN path above).
693 bool Server::send_pending_tls_data(Client *client)
695 // See if there's data from the TLS library to write.
696 if (client->tls_data_to_send == nullptr) {
697 client->tls_data_to_send = tls_get_write_buffer(client->tls_context, &client->tls_data_left_to_send);
698 if (client->tls_data_to_send == nullptr) {
699 // Really no data to send.
707 ret = write(client->sock, client->tls_data_to_send, client->tls_data_left_to_send);
708 } while (ret == -1 && errno == EINTR);
709 assert(ret < 0 || size_t(ret) <= client->tls_data_left_to_send);
711 if (ret == -1 && errno == EAGAIN) {
712 // We're out of socket space, so now we're at the “low edge” of epoll's
713 // edge triggering. epoll will tell us when there is more room, so for now,
715 // This is postcondition #4.
719 // Error! Postcondition #1.
721 close_client(client);
724 if (ret > 0 && size_t(ret) == client->tls_data_left_to_send) {
725 // All data has been sent, so we don't need to go to sleep.
726 tls_buffer_clear(client->tls_context);
727 client->tls_data_to_send = nullptr;
731 // More data to send, so try again.
732 client->tls_data_to_send += ret;
733 client->tls_data_left_to_send -= ret;
734 goto send_data_again;
737 int Server::read_nontls_data(Client *client, char *buf, size_t max_size)
741 ret = read(client->sock, buf, max_size);
742 } while (ret == -1 && errno == EINTR);
744 if (ret == -1 && errno == EAGAIN) {
745 // No more data right now. Nothing to do.
746 // This is postcondition #2.
751 close_client(client);
755 // OK, the socket is closed.
756 close_client(client);
763 int Server::read_tls_data(Client *client, char *buf, size_t max_size)
768 ret = read(client->sock, buf, max_size);
769 } while (ret == -1 && errno == EINTR);
771 if (ret == -1 && errno == EAGAIN) {
772 // No more data right now. Nothing to do.
773 // This is postcondition #2.
778 close_client(client);
782 // OK, the socket is closed.
783 close_client(client);
787 // Give it to the TLS library.
788 int err = tls_consume_stream(client->tls_context, reinterpret_cast<const unsigned char *>(buf), ret, nullptr);
790 log_tls_error("tls_consume_stream", err);
791 close_client(client);
795 // Not consumed any data. See if we can read more.
799 // Read any decrypted data available for us. (We can reuse buf, since it's free now.)
800 ret = tls_read(client->tls_context, reinterpret_cast<unsigned char *>(buf), max_size);
802 // No decrypted data for us yet, but there might be some more handshaking
803 // to send. Do that if needed, then look for more data.
804 if (send_pending_tls_data(client)) {
805 // send_pending_tls_data() hit postconditions #1 or #4.
811 log_tls_error("tls_read", ret);
812 close_client(client);
820 // See if there's some data we've lost. Ideally, we should drop to a block boundary,
821 // but resync will be the mux's problem.
822 void Server::skip_lost_data(Client *client)
824 Stream *stream = client->stream;
825 if (stream == nullptr) {
828 size_t bytes_to_send = stream->bytes_received - client->stream_pos;
829 if (bytes_to_send > stream->backlog_size) {
830 size_t bytes_lost = bytes_to_send - stream->backlog_size;
831 client->bytes_lost += bytes_lost;
832 ++client->num_loss_events;
833 if (!client->close_after_response) {
834 assert(client->stream_pos_end != Client::STREAM_POS_NO_END);
836 // We've already sent a Content-length, so we can't just skip data.
837 // Close the connection immediately and hope the other side
838 // is able to figure out that there was an error and it needs to skip.
839 client->close_after_response = true;
840 client->stream_pos = client->stream_pos_end;
842 client->stream_pos = stream->bytes_received - stream->backlog_size;
847 int Server::parse_request(Client *client)
849 vector<string> lines = split_lines(client->request);
850 client->request.clear();
852 return 400; // Bad request (empty).
855 // Parse the headers, for logging purposes.
856 // TODO: Case-insensitivity.
857 multimap<string, string> headers = extract_headers(lines, client->remote_addr);
858 multimap<string, string>::const_iterator referer_it = headers.find("Referer");
859 if (referer_it != headers.end()) {
860 client->referer = referer_it->second;
862 multimap<string, string>::const_iterator user_agent_it = headers.find("User-Agent");
863 if (user_agent_it != headers.end()) {
864 client->user_agent = user_agent_it->second;
867 vector<string> request_tokens = split_tokens(lines[0]);
868 if (request_tokens.size() < 3) {
869 return 400; // Bad request (empty).
871 if (request_tokens[0] != "GET") {
872 return 400; // Should maybe be 405 instead?
875 string url = request_tokens[1];
877 if (url.size() > 8 && url.find("?backlog") == url.size() - 8) {
878 client->stream_pos = Client::STREAM_POS_AT_START;
879 url = url.substr(0, url.size() - 8);
881 size_t pos = url.find("?frag=");
882 if (pos != string::npos) {
883 // Parse an endpoint of the type /stream.mp4?frag=1234-5678.
884 const char *ptr = url.c_str() + pos + 6;
886 // "?frag=header" is special.
887 if (strcmp(ptr, "header") == 0) {
888 client->stream_pos = Client::STREAM_POS_HEADER_ONLY;
889 client->stream_pos_end = -1;
892 long long frag_start = strtol(ptr, &endptr, 10);
893 if (ptr == endptr || frag_start < 0 || frag_start == LLONG_MAX) {
894 return 400; // Bad request.
896 if (*endptr != '-') {
897 return 400; // Bad request.
901 long long frag_end = strtol(ptr, &endptr, 10);
902 if (ptr == endptr || frag_end < frag_start || frag_end == LLONG_MAX) {
903 return 400; // Bad request.
906 if (*endptr != '\0') {
907 return 400; // Bad request.
910 client->stream_pos = frag_start;
911 client->stream_pos_end = frag_end;
913 url = url.substr(0, pos);
915 client->stream_pos = -1;
916 client->stream_pos_end = -1;
920 // Figure out if we're supposed to close the socket after we've delivered the response.
921 string protocol = request_tokens[2];
922 if (protocol.find("HTTP/") != 0) {
923 return 400; // Bad request.
925 client->close_after_response = false;
926 client->http_11 = true;
927 if (protocol == "HTTP/1.0") {
928 // No persistent connections.
929 client->close_after_response = true;
930 client->http_11 = false;
932 multimap<string, string>::const_iterator connection_it = headers.find("Connection");
933 if (connection_it != headers.end() && connection_it->second == "close") {
934 client->close_after_response = true;
938 map<string, int>::const_iterator stream_url_map_it = stream_url_map.find(url);
939 if (stream_url_map_it == stream_url_map.end()) {
940 map<string, string>::const_iterator ping_url_map_it = ping_url_map.find(url);
941 if (ping_url_map_it == ping_url_map.end()) {
942 return 404; // Not found.
944 return 204; // No error.
948 Stream *stream = streams[stream_url_map_it->second].get();
949 if (stream->http_header.empty()) {
950 return 503; // Service unavailable.
953 if (client->stream_pos_end == Client::STREAM_POS_NO_END) {
954 // This stream won't end, so we don't have a content-length,
955 // and can just as well tell the client it's Connection: close
956 // (otherwise, we'd have to implement chunking TE for no good reason).
957 client->close_after_response = true;
959 if (stream->encoding == Stream::STREAM_ENCODING_METACUBE) {
960 // This doesn't make any sense, and is hard to implement, too.
961 return 416; // Range not satisfiable.
964 // Check that we have the requested fragment in our backlog.
965 size_t buffer_end = stream->bytes_received;
966 size_t buffer_start = (buffer_end <= stream->backlog_size) ? 0 : buffer_end - stream->backlog_size;
968 if (client->stream_pos_end > buffer_end ||
969 client->stream_pos < buffer_start) {
970 return 416; // Range not satisfiable.
974 client->stream = stream;
975 if (setsockopt(client->sock, SOL_SOCKET, SO_MAX_PACING_RATE, &client->stream->pacing_rate, sizeof(client->stream->pacing_rate)) == -1) {
976 if (client->stream->pacing_rate != ~0U) {
977 log_perror("setsockopt(SO_MAX_PACING_RATE)");
980 client->request.clear();
985 void Server::construct_header(Client *client)
987 Stream *stream = client->stream;
988 string response = stream->http_header;
989 if (client->stream_pos == Client::STREAM_POS_HEADER_ONLY) {
991 snprintf(buf, sizeof(buf), "Content-length: %zu\r\n", stream->stream_header.size());
992 response.append(buf);
993 } else if (client->stream_pos_end != Client::STREAM_POS_NO_END) {
995 snprintf(buf, sizeof(buf), "Content-length: %zu\r\n", client->stream_pos_end - client->stream_pos);
996 response.append(buf);
998 if (client->http_11) {
999 assert(response.find("HTTP/1.0") == 0);
1000 response[7] = '1'; // Change to HTTP/1.1.
1001 if (client->close_after_response) {
1002 response.append("Connection: close\r\n");
1005 assert(client->close_after_response);
1007 if (stream->encoding == Stream::STREAM_ENCODING_RAW) {
1008 response.append("\r\n");
1009 } else if (stream->encoding == Stream::STREAM_ENCODING_METACUBE) {
1010 response.append("Content-encoding: metacube\r\n\r\n");
1011 if (!stream->stream_header.empty()) {
1012 metacube2_block_header hdr;
1013 memcpy(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync));
1014 hdr.size = htonl(stream->stream_header.size());
1015 hdr.flags = htons(METACUBE_FLAGS_HEADER);
1016 hdr.csum = htons(metacube2_compute_crc(&hdr));
1017 response.append(string(reinterpret_cast<char *>(&hdr), sizeof(hdr)));
1022 if (client->stream_pos == Client::STREAM_POS_HEADER_ONLY) {
1023 client->state = Client::SENDING_SHORT_RESPONSE;
1024 response.append(stream->stream_header);
1026 client->state = Client::SENDING_HEADER;
1027 if (client->stream_pos_end == Client::STREAM_POS_NO_END) { // Fragments don't contain stream headers.
1028 response.append(stream->stream_header);
1032 client->header_or_short_response_holder = move(response);
1033 client->header_or_short_response = &client->header_or_short_response_holder;
1036 change_epoll_events(client, EPOLLOUT | EPOLLET | EPOLLRDHUP);
1039 void Server::construct_error(Client *client, int error_code)
1042 if (client->http_11 && client->close_after_response) {
1043 snprintf(error, sizeof(error),
1044 "HTTP/1.1 %d Error\r\nContent-type: text/plain\r\nConnection: close\r\n\r\nSomething went wrong. Sorry.\r\n",
1047 snprintf(error, sizeof(error),
1048 "HTTP/1.%d %d Error\r\nContent-type: text/plain\r\nContent-length: 30\r\n\r\nSomething went wrong. Sorry.\r\n",
1049 client->http_11, error_code);
1051 client->header_or_short_response_holder = error;
1052 client->header_or_short_response = &client->header_or_short_response_holder;
1055 client->state = Client::SENDING_SHORT_RESPONSE;
1056 change_epoll_events(client, EPOLLOUT | EPOLLET | EPOLLRDHUP);
1059 void Server::construct_204(Client *client)
1061 map<string, string>::const_iterator ping_url_map_it = ping_url_map.find(client->url);
1062 assert(ping_url_map_it != ping_url_map.end());
1065 if (client->http_11) {
1066 response = "HTTP/1.1 204 No Content\r\n";
1067 if (client->close_after_response) {
1068 response.append("Connection: close\r\n");
1071 response = "HTTP/1.0 204 No Content\r\n";
1072 assert(client->close_after_response);
1074 if (!ping_url_map_it->second.empty()) {
1075 response.append("Access-Control-Allow-Origin: ");
1076 response.append(ping_url_map_it->second);
1077 response.append("\r\n");
1079 response.append("\r\n");
1081 client->header_or_short_response_holder = move(response);
1082 client->header_or_short_response = &client->header_or_short_response_holder;
1085 client->state = Client::SENDING_SHORT_RESPONSE;
1086 change_epoll_events(client, EPOLLOUT | EPOLLET | EPOLLRDHUP);
1090 void delete_from(vector<T> *v, T elem)
1092 typename vector<T>::iterator new_end = remove(v->begin(), v->end(), elem);
1093 v->erase(new_end, v->end());
1096 void Server::close_client(Client *client)
1098 if (epoll_ctl(epoll_fd, EPOLL_CTL_DEL, client->sock, nullptr) == -1) {
1099 log_perror("epoll_ctl(EPOLL_CTL_DEL)");
1103 // This client could be sleeping, so we'll need to fix that. (Argh, O(n).)
1104 if (client->stream != nullptr) {
1105 delete_from(&client->stream->sleeping_clients, client);
1106 delete_from(&client->stream->to_process, client);
1109 if (client->tls_context) {
1110 tls_destroy_context(client->tls_context);
1113 // Log to access_log.
1114 access_log->write(client->get_stats());
1117 safe_close(client->sock);
1119 clients.erase(client->sock);
1122 void Server::change_epoll_events(Client *client, uint32_t events)
1126 ev.data.ptr = client;
1128 if (epoll_ctl(epoll_fd, EPOLL_CTL_MOD, client->sock, &ev) == -1) {
1129 log_perror("epoll_ctl(EPOLL_CTL_MOD)");
1134 bool Server::more_requests(Client *client)
1136 if (client->close_after_response) {
1140 // Switch states and reset the parsers. We don't reset statistics.
1141 client->state = Client::READING_REQUEST;
1142 client->url.clear();
1143 client->stream = NULL;
1144 client->header_or_short_response = nullptr;
1145 client->header_or_short_response_holder.clear();
1146 client->header_or_short_response_ref.reset();
1147 client->header_or_short_response_bytes_sent = 0;
1149 change_epoll_events(client, EPOLLIN | EPOLLET | EPOLLRDHUP); // No TLS handshake, so no EPOLLOUT needed.
1154 void Server::process_queued_data()
1157 lock_guard<mutex> lock(queued_clients_mutex);
1159 for (const pair<int, Acceptor *> &id_and_acceptor : queued_add_clients) {
1160 add_client(id_and_acceptor.first, id_and_acceptor.second);
1162 queued_add_clients.clear();
1165 for (unique_ptr<Stream> &stream : streams) {
1166 stream->process_queued_data();