d0e1c5c82135f42bf7ac1b75e77d90af5d4a5402
[cubemap] / httpinput.cpp
1 #include <assert.h>
2 #include <errno.h>
3 #include <fcntl.h>
4 #include <math.h>
5 #include <netdb.h>
6 #include <netinet/in.h>
7 #include <poll.h>
8 #include <stdint.h>
9 #include <stdlib.h>
10 #include <string.h>
11 #include <sys/ioctl.h>
12 #include <sys/socket.h>
13 #include <sys/time.h>
14 #include <time.h>
15 #include <unistd.h>
16 #include <math.h>
17 #include <map>
18 #include <string>
19 #include <utility>
20 #include <vector>
21
22 #include "httpinput.h"
23 #include "log.h"
24 #include "metacube2.h"
25 #include "parse.h"
26 #include "serverpool.h"
27 #include "state.pb.h"
28 #include "stream.h"
29 #include "timespec.h"
30 #include "util.h"
31 #include "version.h"
32
33 using namespace std;
34
35 namespace {
36
37 string host_header(const string &host, const string &port)
38 {
39         if (port == "http" || atoi(port.c_str()) == 80) {
40                 return host;
41         } else {
42                 return host + ":" + port;
43         }
44 }
45
46 }  // namespace
47
48 extern ServerPool *servers;
49
50 HTTPInput::HTTPInput(const string &url, Input::Encoding encoding)
51         : state(NOT_CONNECTED),
52           url(url),
53           encoding(encoding)
54 {
55         stats.url = url;
56         stats.bytes_received = 0;
57         stats.data_bytes_received = 0;
58         stats.metadata_bytes_received = 0;
59         stats.connect_time = -1;
60         stats.latency_sec = HUGE_VAL;
61 }
62
63 HTTPInput::HTTPInput(const InputProto &serialized)
64         : state(State(serialized.state())),
65           url(serialized.url()),
66           encoding(serialized.is_metacube_encoded() ?
67                    Input::INPUT_ENCODING_METACUBE :
68                    Input::INPUT_ENCODING_RAW),
69           request(serialized.request()),
70           request_bytes_sent(serialized.request_bytes_sent()),
71           response(serialized.response()),
72           http_header(serialized.http_header()),
73           stream_header(serialized.stream_header()),
74           has_metacube_header(serialized.has_metacube_header()),
75           sock(serialized.sock())
76 {
77         // Set back the close-on-exec flag for the socket.
78         // (This can't leak into a child, since we haven't been started yet.)
79         fcntl(sock, F_SETFD, 1);
80
81         pending_data.resize(serialized.pending_data().size());
82         memcpy(&pending_data[0], serialized.pending_data().data(), serialized.pending_data().size());
83
84         string protocol, user;
85         parse_url(url, &protocol, &user, &host, &port, &path);  // Don't care if it fails.
86
87         stats.url = url;
88         stats.bytes_received = serialized.bytes_received();
89         stats.data_bytes_received = serialized.data_bytes_received();
90         stats.metadata_bytes_received = serialized.metadata_bytes_received();
91         if (serialized.has_connect_time()) {
92                 stats.connect_time = serialized.connect_time();
93         } else {
94                 stats.connect_time = time(nullptr);
95         }
96         if (serialized.has_latency_sec()) {
97                 stats.latency_sec = serialized.latency_sec();
98         } else {
99                 stats.latency_sec = HUGE_VAL;
100         }
101
102         last_verbose_connection.tv_sec = -3600;
103         last_verbose_connection.tv_nsec = 0;
104 }
105
106 void HTTPInput::close_socket()
107 {
108         if (sock != -1) {
109                 safe_close(sock);
110                 sock = -1;
111         }
112
113         lock_guard<mutex> lock(stats_mutex);
114         stats.connect_time = -1;
115 }
116
117 InputProto HTTPInput::serialize() const
118 {
119         // Unset the close-on-exec flag for the socket.
120         // (This can't leak into a child, since there's only one thread left.)
121         fcntl(sock, F_SETFD, 0);
122
123         InputProto serialized;
124         serialized.set_state(state);
125         serialized.set_url(url);
126         serialized.set_request(request);
127         serialized.set_request_bytes_sent(request_bytes_sent);
128         serialized.set_response(response);
129         serialized.set_http_header(http_header);
130         serialized.set_stream_header(stream_header);
131         serialized.set_pending_data(string(pending_data.begin(), pending_data.end()));
132         serialized.set_has_metacube_header(has_metacube_header);
133         serialized.set_sock(sock);
134         serialized.set_bytes_received(stats.bytes_received);
135         serialized.set_data_bytes_received(stats.data_bytes_received);
136         if (isfinite(stats.latency_sec)) {
137                 serialized.set_latency_sec(stats.latency_sec);
138         }
139         serialized.set_connect_time(stats.connect_time);
140         if (encoding == Input::INPUT_ENCODING_METACUBE) {
141                 serialized.set_is_metacube_encoded(true);
142         } else {
143                 assert(encoding == Input::INPUT_ENCODING_RAW);
144                 serialized.set_is_metacube_encoded(false);
145         }
146         return serialized;
147 }
148
149 int HTTPInput::lookup_and_connect(const string &host, const string &port)
150 {
151         addrinfo *ai;
152         int err = getaddrinfo(host.c_str(), port.c_str(), nullptr, &ai);
153         if (err != 0) {
154                 if (!suppress_logging) {
155                         log(WARNING, "[%s] Lookup of '%s' failed (%s).",
156                                 url.c_str(), host.c_str(), gai_strerror(err));
157                 }
158                 return -1;
159         }
160
161         addrinfo *base_ai = ai;
162
163         // Connect to everything in turn until we have a socket.
164         for ( ; ai && !should_stop(); ai = ai->ai_next) {
165                 // Now do a non-blocking connect. This is important because we want to be able to be
166                 // woken up, even though it's rather cumbersome.
167                 int sock = socket(ai->ai_family, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, IPPROTO_TCP);
168                 if (sock == -1) {
169                         // Could be e.g. EPROTONOSUPPORT. The show must go on.
170                         continue;
171                 }
172
173                 // Do a non-blocking connect.
174                 do {
175                         err = connect(sock, ai->ai_addr, ai->ai_addrlen);
176                 } while (err == -1 && errno == EINTR);
177
178                 if (err == -1 && errno != EINPROGRESS) {
179                         log_perror("connect");
180                         safe_close(sock);
181                         continue;
182                 }
183
184                 // Wait for the connect to complete, or an error to happen.
185                 for ( ;; ) {
186                         bool complete = wait_for_activity(sock, POLLIN | POLLOUT, nullptr);
187                         if (should_stop()) {
188                                 safe_close(sock);
189                                 return -1;
190                         }
191                         if (complete) {
192                                 break;
193                         }
194                 }
195
196                 // Check whether it ended in an error or not.
197                 socklen_t err_size = sizeof(err);
198                 if (getsockopt(sock, SOL_SOCKET, SO_ERROR, &err, &err_size) == -1) {
199                         log_perror("getsockopt");
200                         safe_close(sock);
201                         continue;
202                 }
203
204                 errno = err;
205
206                 if (err == 0) {
207                         // Successful connect.
208                         freeaddrinfo(base_ai);
209                         return sock;
210                 }
211
212                 safe_close(sock);
213         }
214
215         // Give the last one as error.
216         if (!suppress_logging) {
217                 log(WARNING, "[%s] Connect to '%s' failed (%s)",
218                         url.c_str(), host.c_str(), strerror(errno));
219         }
220         freeaddrinfo(base_ai);
221         return -1;
222 }
223         
224 bool HTTPInput::parse_response(const string &request)
225 {
226         vector<string> lines = split_lines(response);
227         if (lines.empty()) {
228                 if (!suppress_logging) {
229                         log(WARNING, "[%s] Empty HTTP response from input.", url.c_str());
230                 }
231                 return false;
232         }
233
234         vector<string> first_line_tokens = split_tokens(lines[0]);
235         if (first_line_tokens.size() < 2) {
236                 if (!suppress_logging) {
237                         log(WARNING, "[%s] Malformed response line '%s' from input.",
238                                 url.c_str(), lines[0].c_str());
239                 }
240                 return false;
241         }
242
243         int response = atoi(first_line_tokens[1].c_str());
244         if (response != 200) {
245                 if (!suppress_logging) {
246                         log(WARNING, "[%s] Non-200 response '%s' from input.",
247                                 url.c_str(), lines[0].c_str());
248                 }
249                 return false;
250         }
251
252         HTTPHeaderMultimap parameters = extract_headers(lines, url);
253
254         // Remove “Content-encoding: metacube”.
255         const auto encoding_it = parameters.find("Content-Encoding");
256         if (encoding_it != parameters.end() && encoding_it->second == "metacube") {
257                 parameters.erase(encoding_it);
258         }
259
260         // Change “Server: foo” to “Server: metacube/0.1 (reflecting: foo)”
261         // XXX: Use a Via: instead?
262         if (parameters.count("Server") == 0) {
263                 parameters.insert(make_pair("Server", SERVER_IDENTIFICATION));
264         } else {
265                 for (auto &key_and_value : parameters) {
266                         if (key_and_value.first != "Server") {
267                                 continue;
268                         }
269                         key_and_value.second = SERVER_IDENTIFICATION " (reflecting: " + key_and_value.second + ")";
270                 }
271         }
272
273         // Erase “Connection: close”; we'll set it on the sending side if needed.
274         parameters.erase("Connection");
275
276         // Construct the new HTTP header.
277         http_header = "HTTP/1.0 200 OK\r\n";
278         for (const auto &key_and_value : parameters) {
279                 http_header.append(key_and_value.first + ": " + key_and_value.second + "\r\n");
280         }
281
282         for (int stream_index : stream_indices) {
283                 servers->set_header(stream_index, http_header, stream_header);
284         }
285
286         return true;
287 }
288
289 void HTTPInput::do_work()
290 {
291         timespec last_activity;
292
293         // TODO: Make the timeout persist across restarts.
294         if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
295                 int err = clock_gettime(CLOCK_MONOTONIC_COARSE, &last_activity);
296                 assert(err != -1);
297         }
298
299         while (!should_stop()) {
300                 if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
301                         // Give the socket 30 seconds since last activity before we time out.
302                         static const int timeout_secs = 30;
303
304                         timespec now;
305                         int err = clock_gettime(CLOCK_MONOTONIC_COARSE, &now);
306                         assert(err != -1);
307
308                         timespec elapsed = clock_diff(last_activity, now);
309                         if (elapsed.tv_sec >= timeout_secs) {
310                                 // Timeout!
311                                 if (!suppress_logging) {
312                                         log(ERROR, "[%s] Timeout after %d seconds, closing.", url.c_str(), elapsed.tv_sec);
313                                 }
314                                 state = CLOSING_SOCKET;
315                                 continue;
316                         }
317
318                         // Basically calculate (30 - (now - last_activity)) = (30 + (last_activity - now)).
319                         // Add a second of slack to account for differences between clocks.
320                         timespec timeout = clock_diff(now, last_activity);
321                         timeout.tv_sec += timeout_secs + 1;
322                         assert(timeout.tv_sec > 0 || (timeout.tv_sec >= 0 && timeout.tv_nsec > 0));
323
324                         bool activity = wait_for_activity(sock, (state == SENDING_REQUEST) ? POLLOUT : POLLIN, &timeout);
325                         if (activity) {
326                                 err = clock_gettime(CLOCK_MONOTONIC_COARSE, &last_activity);
327                                 assert(err != -1);
328                         } else {
329                                 // OK. Most likely, should_stop was set, or we have timed out.
330                                 continue;
331                         }
332                 }
333
334                 switch (state) {
335                 case NOT_CONNECTED:
336                         request.clear();
337                         request_bytes_sent = 0;
338                         response.clear();
339                         pending_data.clear();
340                         has_metacube_header = false;
341                         for (int stream_index : stream_indices) {
342                                 // Don't zero out the header; it might still be of use to HLS clients.
343                                 servers->set_unavailable(stream_index);
344                         }
345
346                         {
347                                 string protocol, user;  // Thrown away.
348                                 if (!parse_url(url, &protocol, &user, &host, &port, &path)) {
349                                         if (!suppress_logging) {
350                                                 log(WARNING, "[%s] Failed to parse URL '%s'", url.c_str(), url.c_str());
351                                         }
352                                         break;
353                                 }
354
355                                 // Remove the brackets around IPv6 address literals.
356                                 // TODO: See if we can join this with the code in parse_ip_address(),
357                                 // or maybe even more it into parse_url().
358                                 if (!host.empty() && host[0] == '[' && host[host.size() - 1] == ']') {
359                                         host = host.substr(1, host.size() - 2);
360                                 }
361                         }
362
363                         if (suppress_logging) {
364                                 // See if there's more than one minute since last time we made a connection
365                                 // with logging enabled. If so, turn it on again.
366                                 timespec now;
367                                 int err = clock_gettime(CLOCK_MONOTONIC_COARSE, &now);
368                                 assert(err != -1);
369
370                                 double elapsed = now.tv_sec - last_verbose_connection.tv_sec +
371                                         1e-9 * (now.tv_nsec - last_verbose_connection.tv_nsec);
372                                 if (elapsed > 60.0) {
373                                         suppress_logging = false;
374                                 }
375                         }
376                         if (!suppress_logging) {
377                                 int err = clock_gettime(CLOCK_MONOTONIC_COARSE, &last_verbose_connection);
378                                 assert(err != -1);
379                         }
380                         ++num_connection_attempts;
381                         sock = lookup_and_connect(host, port);
382                         if (sock != -1) {
383                                 // Yay, successful connect.
384                                 state = SENDING_REQUEST;
385                                 request = "GET " + path + " HTTP/1.0\r\nHost: " + host_header(host, port) + "\r\nUser-Agent: cubemap\r\n\r\n";
386                                 request_bytes_sent = 0;
387
388                                 lock_guard<mutex> lock(stats_mutex);
389                                 stats.connect_time = time(nullptr);
390                                 clock_gettime(CLOCK_MONOTONIC_COARSE, &last_activity);
391                         }
392                         break;
393                 case SENDING_REQUEST: {
394                         size_t to_send = request.size() - request_bytes_sent;
395                         int ret;
396
397                         do {
398                                 ret = write(sock, request.data() + request_bytes_sent, to_send);
399                         } while (ret == -1 && errno == EINTR);
400
401                         if (ret == -1) {
402                                 log_perror("write");
403                                 state = CLOSING_SOCKET;
404                                 continue;
405                         }
406
407                         assert(ret >= 0);
408                         request_bytes_sent += ret;
409
410                         if (request_bytes_sent == request.size()) {
411                                 state = RECEIVING_HEADER;
412                         }
413                         break;
414                 }
415                 case RECEIVING_HEADER: {
416                         char buf[4096];
417                         int ret;
418
419                         do {
420                                 ret = read(sock, buf, sizeof(buf));
421                         } while (ret == -1 && errno == EINTR);
422
423                         if (ret == -1) {
424                                 log_perror("read");
425                                 state = CLOSING_SOCKET;
426                                 continue;
427                         }
428
429                         if (ret == 0) {
430                                 // This really shouldn't happen...
431                                 if (!suppress_logging) {
432                                         log(ERROR, "[%s] Socket unexpectedly closed while reading header",
433                                                    url.c_str());
434                                 }
435                                 state = CLOSING_SOCKET;
436                                 continue;
437                         }
438                         
439                         RequestParseStatus status = wait_for_double_newline(&response, buf, ret);
440                         
441                         if (status == RP_OUT_OF_SPACE) {
442                                 if (!suppress_logging) {
443                                         log(WARNING, "[%s] Server sent overlong HTTP response!", url.c_str());
444                                 }
445                                 state = CLOSING_SOCKET;
446                                 continue;
447                         } else if (status == RP_NOT_FINISHED_YET) {
448                                 continue;
449                         }
450         
451                         // OK, so we're fine, but there might be some of the actual data after the response.
452                         // We'll need to deal with that separately.
453                         string extra_data;
454                         if (status == RP_EXTRA_DATA) {
455                                 char *ptr = static_cast<char *>(
456                                         memmem(response.data(), response.size(), "\r\n\r\n", 4));
457                                 assert(ptr != nullptr);
458                                 extra_data = string(ptr + 4, &response[0] + response.size());
459                                 response.resize(ptr - response.data());
460                         }
461
462                         if (!parse_response(response)) {
463                                 state = CLOSING_SOCKET;
464                                 continue;
465                         }
466
467                         if (!extra_data.empty()) {
468                                 process_data(&extra_data[0], extra_data.size());
469                         }
470
471                         if (!suppress_logging) {
472                                 if (encoding == Input::INPUT_ENCODING_RAW) {
473                                         log(INFO, "[%s] Connected to '%s', receiving raw data.",
474                                                    url.c_str(), url.c_str());
475                                 } else {
476                                         assert(encoding == Input::INPUT_ENCODING_METACUBE);
477                                         log(INFO, "[%s] Connected to '%s', receiving data.",
478                                                    url.c_str(), url.c_str());
479                                 }
480                         }
481                         state = RECEIVING_DATA;
482                         break;
483                 }
484                 case RECEIVING_DATA: {
485                         char buf[4096];
486                         int ret;
487
488                         do {
489                                 ret = read(sock, buf, sizeof(buf));
490                         } while (ret == -1 && errno == EINTR);
491
492                         if (ret == -1) {
493                                 log_perror("read");
494                                 state = CLOSING_SOCKET;
495                                 continue;
496                         }
497
498                         if (ret == 0) {
499                                 // This really shouldn't happen...
500                                 if (!suppress_logging) {
501                                         log(ERROR, "[%s] Socket unexpectedly closed while reading data",
502                                                    url.c_str());
503                                 }
504                                 state = CLOSING_SOCKET;
505                                 continue;
506                         }
507
508                         num_connection_attempts = 0;  // Reset, since we have a successful read.
509                         if (suppress_logging) {
510                                 // This was suppressed earlier, so print it out now.
511                                 if (encoding == Input::INPUT_ENCODING_RAW) {
512                                         log(INFO, "[%s] Connected to '%s', receiving raw data.",
513                                                    url.c_str(), url.c_str());
514                                 } else {
515                                         assert(encoding == Input::INPUT_ENCODING_METACUBE);
516                                         log(INFO, "[%s] Connected to '%s', receiving data.",
517                                                    url.c_str(), url.c_str());
518                                 }
519                                 suppress_logging = false;
520                         }
521
522                         process_data(buf, ret);
523                         break;
524                 }
525                 case CLOSING_SOCKET: {
526                         close_socket();
527                         state = NOT_CONNECTED;
528                         break;
529                 }
530                 default:
531                         assert(false);
532                 }
533
534                 // If we are still in NOT_CONNECTED, either something went wrong,
535                 // or the connection just got closed.
536                 // The earlier steps have already given the error message, if any.
537                 if (state == NOT_CONNECTED && !should_stop()) {
538                         if (!suppress_logging) {
539                                 log(INFO, "[%s] Waiting 0.2 seconds and restarting...", url.c_str());
540                         }
541
542                         if (num_connection_attempts >= 3 && !suppress_logging) {
543                                 log(INFO, "[%s] %d failed connection attempts, suppressing logging for one minute.",
544                                         url.c_str(), num_connection_attempts);
545                                 suppress_logging = true;
546                         }
547                         timespec timeout_ts;
548                         timeout_ts.tv_sec = 0;
549                         timeout_ts.tv_nsec = 200000000;
550                         wait_for_wakeup(&timeout_ts);
551                 }
552         }
553 }
554
555 void HTTPInput::process_data(char *ptr, size_t bytes)
556 {
557         {
558                 lock_guard<mutex> lock(stats_mutex);
559                 stats.bytes_received += bytes;
560         }
561
562         if (encoding == Input::INPUT_ENCODING_RAW) {
563                 for (int stream_index : stream_indices) {
564                         servers->add_data(stream_index, ptr, bytes, /*metacube_flags=*/0, /*pts=*/RationalPTS());
565                 }
566                 return;
567         }
568
569         assert(encoding == Input::INPUT_ENCODING_METACUBE);
570         pending_data.insert(pending_data.end(), ptr, ptr + bytes);
571
572         for ( ;; ) {
573                 // If we don't have enough data (yet) for even the Metacube header, just return.
574                 if (pending_data.size() < sizeof(metacube2_block_header)) {
575                         return;
576                 }
577
578                 // Make sure we have the Metacube sync header at the start.
579                 // We may need to skip over junk data (it _should_ not happen, though).
580                 if (!has_metacube_header) {
581                         char *ptr = static_cast<char *>(
582                                 memmem(pending_data.data(), pending_data.size(),
583                                        METACUBE2_SYNC, strlen(METACUBE2_SYNC)));
584                         if (ptr == nullptr) {
585                                 // OK, so we didn't find the sync marker. We know then that
586                                 // we do not have the _full_ marker in the buffer, but we
587                                 // could have N-1 bytes. Drop everything before that,
588                                 // and then give up.
589                                 drop_pending_data(pending_data.size() - (strlen(METACUBE2_SYNC) - 1));
590                                 return;
591                         } else {
592                                 // Yay, we found the header. Drop everything (if anything) before it.
593                                 drop_pending_data(ptr - pending_data.data());
594                                 has_metacube_header = true;
595
596                                 // Re-check that we have the entire header; we could have dropped data.
597                                 if (pending_data.size() < sizeof(metacube2_block_header)) {
598                                         return;
599                                 }
600                         }
601                 }
602
603                 // Now it's safe to read the header.
604                 metacube2_block_header hdr;
605                 memcpy(&hdr, pending_data.data(), sizeof(hdr));
606                 assert(memcmp(hdr.sync, METACUBE2_SYNC, sizeof(hdr.sync)) == 0);
607                 uint32_t size = ntohl(hdr.size);
608                 uint16_t flags = ntohs(hdr.flags);
609                 uint16_t expected_csum = metacube2_compute_crc(&hdr);
610
611                 if (expected_csum != ntohs(hdr.csum)) {
612                         log(WARNING, "[%s] Metacube checksum failed (expected 0x%x, got 0x%x), "
613                                 "not reading block claiming to be %d bytes (flags=%x).",
614                                 url.c_str(), expected_csum, ntohs(hdr.csum),
615                                 size, flags);
616
617                         // Drop only the first byte, and let the rest of the code handle resync.
618                         pending_data.erase(pending_data.begin(), pending_data.begin() + 1);
619                         has_metacube_header = false;
620                         continue;
621                 }
622                 if (size > 10485760) {
623                         log(WARNING, "[%s] Metacube block of %d bytes (flags=%x); corrupted header??",
624                                 url.c_str(), size, flags);
625                 }
626
627                 // See if we have the entire block. If not, wait for more data.
628                 if (pending_data.size() < sizeof(metacube2_block_header) + size) {
629                         return;
630                 }
631
632                 // See if this is a metadata block. If so, we don't want to send it on,
633                 // but rather process it ourselves.
634                 // TODO: Keep metadata when sending on to other Metacube users.
635                 if (flags & METACUBE_FLAGS_METADATA) {
636                         {
637                                 lock_guard<mutex> lock(stats_mutex);
638                                 stats.metadata_bytes_received += size;
639                         }
640                         process_metacube_metadata_block(hdr, pending_data.data() + sizeof(hdr), size);
641                 } else {
642                         // Send this block on to the servers.
643                         {
644                                 lock_guard<mutex> lock(stats_mutex);
645                                 stats.data_bytes_received += size;
646                         }
647                         char *inner_data = pending_data.data() + sizeof(metacube2_block_header);
648                         if (flags & METACUBE_FLAGS_HEADER) {
649                                 stream_header = string(inner_data, inner_data + size);
650                                 for (int stream_index : stream_indices) {
651                                         servers->set_header(stream_index, http_header, stream_header);
652                                 }
653                         }
654                         for (int stream_index : stream_indices) {
655                                 servers->add_data(stream_index, inner_data, size, flags, next_block_pts);
656                         }
657                         next_block_pts = RationalPTS();
658                 }
659
660                 // Consume the block. This isn't the most efficient way of dealing with things
661                 // should we have many blocks, but these routines don't need to be too efficient
662                 // anyway.
663                 pending_data.erase(pending_data.begin(), pending_data.begin() + sizeof(metacube2_block_header) + size);
664                 has_metacube_header = false;
665         }
666 }
667
668 void HTTPInput::drop_pending_data(size_t num_bytes)
669 {
670         if (num_bytes == 0) {
671                 return;
672         }
673         log(WARNING, "[%s] Dropping %lld junk bytes; not a Metacube2 stream, or data was dropped from the middle of the stream.",
674                 url.c_str(), (long long)num_bytes);
675         assert(pending_data.size() >= num_bytes);
676         pending_data.erase(pending_data.begin(), pending_data.begin() + num_bytes);
677 }
678
679 void HTTPInput::add_destination(int stream_index)
680 {
681         stream_indices.push_back(stream_index);
682         servers->set_header(stream_index, http_header, stream_header);
683 }
684
685 InputStats HTTPInput::get_stats() const
686 {
687         lock_guard<mutex> lock(stats_mutex);
688         return stats;
689 }
690
691 void HTTPInput::process_metacube_metadata_block(const metacube2_block_header &hdr, const char *payload, uint32_t payload_size)
692 {
693         if (payload_size < sizeof(uint64_t)) {
694                 log(WARNING, "[%s] Undersized Metacube metadata block (%d bytes); corrupted header?",
695                         url.c_str(), payload_size);
696                 return;
697         }
698
699         uint64_t type = be64toh(*(const uint64_t *)payload);
700         if (type == METACUBE_METADATA_TYPE_ENCODER_TIMESTAMP) {
701                 timespec now;
702                 clock_gettime(CLOCK_REALTIME, &now);
703
704                 const metacube2_timestamp_packet *pkt = (const metacube2_timestamp_packet *)payload;
705                 if (payload_size != sizeof(*pkt)) {
706                         log(WARNING, "[%s] Metacube timestamp block of wrong size (%d bytes); ignoring.",
707                                 url.c_str(), payload_size);
708                         return;
709                 }
710
711                 double elapsed = now.tv_sec - be64toh(pkt->tv_sec) +
712                         1e-9 * (now.tv_nsec - long(be64toh(pkt->tv_nsec)));
713                 {
714                         lock_guard<mutex> lock(stats_mutex);
715                         stats.latency_sec = elapsed;
716                 }
717         } else if (type == METACUBE_METADATA_TYPE_NEXT_BLOCK_PTS) {
718                 const metacube2_pts_packet *pkt = (const metacube2_pts_packet *)payload;
719                 if (payload_size != sizeof(*pkt)) {
720                         log(WARNING, "[%s] Metacube pts block of wrong size (%d bytes); ignoring.",
721                                 url.c_str(), payload_size);
722                         return;
723                 }
724                 next_block_pts.pts = be64toh(pkt->pts);
725                 next_block_pts.timebase_num = be64toh(pkt->timebase_num);
726                 next_block_pts.timebase_den = be64toh(pkt->timebase_den);
727         } else {
728                 // Unknown metadata block, ignore
729                 log(INFO, "[%s] Metadata block %llu\n", url.c_str(), type);
730                 return;
731         }
732 }