git.sesse.net Git - cubemap/blob - httpinput.cpp

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