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 <time.h>
  12 #include <unistd.h>
  13 #include <map>
  14 #include <string>
  15 #include <utility>
  16 #include <vector>
  17
  18 #include "httpinput.h"
  19 #include "log.h"
  20 #include "metacube.h"
  21 #include "mutexlock.h"
  22 #include "parse.h"
  23 #include "serverpool.h"
  24 #include "state.pb.h"
  25 #include "util.h"
  26 #include "version.h"
  27
  28 using namespace std;
  29
  30 extern ServerPool *servers;
  31
  32 HTTPInput::HTTPInput(const string &url)
  33         : state(NOT_CONNECTED),
  34           url(url),
  35           has_metacube_header(false),
  36           sock(-1)
  37 {
  38         pthread_mutex_init(&stats_mutex, NULL);
  39         stats.url = url;
  40         stats.bytes_received = 0;
  41         stats.data_bytes_received = 0;
  42 }
  43
  44 HTTPInput::HTTPInput(const InputProto &serialized)
  45         : state(State(serialized.state())),
  46           url(serialized.url()),
  47           request(serialized.request()),
  48           request_bytes_sent(serialized.request_bytes_sent()),
  49           response(serialized.response()),
  50           http_header(serialized.http_header()),
  51           has_metacube_header(serialized.has_metacube_header()),
  52           sock(serialized.sock())
  53 {
  54         pthread_mutex_init(&stats_mutex, NULL);
  55
  56         pending_data.resize(serialized.pending_data().size());
  57         memcpy(&pending_data[0], serialized.pending_data().data(), serialized.pending_data().size());
  58
  59         string protocol;
  60         parse_url(url, &protocol, &host, &port, &path);  // Don't care if it fails.
  61
  62         // Older versions stored the extra \r\n in the HTTP header.
  63         // Strip it if we find it.
  64         if (http_header.size() >= 4 &&
  65             memcmp(http_header.data() + http_header.size() - 4, "\r\n\r\n", 4) == 0) {
  66                 http_header.resize(http_header.size() - 2);
  67         }
  68
  69         pthread_mutex_init(&stats_mutex, NULL);
  70         stats.url = url;
  71         stats.bytes_received = serialized.bytes_received();
  72         stats.data_bytes_received = serialized.data_bytes_received();
  73 }
  74
  75 void HTTPInput::close_socket()
  76 {
  77         if (sock != -1) {
  78                 safe_close(sock);
  79         }
  80 }
  81
  82 InputProto HTTPInput::serialize() const
  83 {
  84         InputProto serialized;
  85         serialized.set_state(state);
  86         serialized.set_url(url);
  87         serialized.set_request(request);
  88         serialized.set_request_bytes_sent(request_bytes_sent);
  89         serialized.set_response(response);
  90         serialized.set_http_header(http_header);
  91         serialized.set_pending_data(string(pending_data.begin(), pending_data.end()));
  92         serialized.set_has_metacube_header(has_metacube_header);
  93         serialized.set_sock(sock);
  94         serialized.set_bytes_received(stats.bytes_received);
  95         serialized.set_data_bytes_received(stats.data_bytes_received);
  96         return serialized;
  97 }
  98
  99 int HTTPInput::lookup_and_connect(const string &host, const string &port)
 100 {
 101         addrinfo *ai;
 102         int err = getaddrinfo(host.c_str(), port.c_str(), NULL, &ai);
 103         if (err != 0) {
 104                 log(WARNING, "[%s] Lookup of '%s' failed (%s).",
 105                         url.c_str(), host.c_str(), gai_strerror(err));
 106                 return -1;
 107         }
 108
 109         addrinfo *base_ai = ai;
 110
 111         // Connect to everything in turn until we have a socket.
 112         for ( ; ai && !should_stop(); ai = ai->ai_next) {
 113                 int sock = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
 114                 if (sock == -1) {
 115                         // Could be e.g. EPROTONOSUPPORT. The show must go on.
 116                         continue;
 117                 }
 118
 119                 // Now do a non-blocking connect. This is important because we want to be able to be
 120                 // woken up, even though it's rather cumbersome.
 121
 122                 // Set the socket as nonblocking.
 123                 int one = 1;
 124                 if (ioctl(sock, FIONBIO, &one) == -1) {
 125                         log_perror("ioctl(FIONBIO)");
 126                         safe_close(sock);
 127                         return -1;
 128                 }
 129
 130                 // Do a non-blocking connect.
 131                 do {
 132                         err = connect(sock, ai->ai_addr, ai->ai_addrlen);
 133                 } while (err == -1 && errno == EINTR);
 134
 135                 if (err == -1 && errno != EINPROGRESS) {
 136                         log_perror("connect");
 137                         safe_close(sock);
 138                         continue;
 139                 }
 140
 141                 // Wait for the connect to complete, or an error to happen.
 142                 for ( ;; ) {
 143                         bool complete = wait_for_activity(sock, POLLIN | POLLOUT, NULL);
 144                         if (should_stop()) {
 145                                 safe_close(sock);
 146                                 return -1;
 147                         }
 148                         if (complete) {
 149                                 break;
 150                         }
 151                 }
 152
 153                 // Check whether it ended in an error or not.
 154                 socklen_t err_size = sizeof(err);
 155                 if (getsockopt(sock, SOL_SOCKET, SO_ERROR, &err, &err_size) == -1) {
 156                         log_perror("getsockopt");
 157                         safe_close(sock);
 158                         continue;
 159                 }
 160
 161                 errno = err;
 162
 163                 if (err == 0) {
 164                         // Successful connect.
 165                         freeaddrinfo(base_ai);
 166                         return sock;
 167                 }
 168
 169                 safe_close(sock);
 170         }
 171
 172         // Give the last one as error.
 173         log(WARNING, "[%s] Connect to '%s' failed (%s)",
 174                 url.c_str(), host.c_str(), strerror(errno));
 175         freeaddrinfo(base_ai);
 176         return -1;
 177 }
 178
 179 bool HTTPInput::parse_response(const std::string &request)
 180 {
 181         vector<string> lines = split_lines(response);
 182         if (lines.empty()) {
 183                 log(WARNING, "[%s] Empty HTTP response from input.", url.c_str());
 184                 return false;
 185         }
 186
 187         vector<string> first_line_tokens = split_tokens(lines[0]);
 188         if (first_line_tokens.size() < 2) {
 189                 log(WARNING, "[%s] Malformed response line '%s' from input.",
 190                         url.c_str(), lines[0].c_str());
 191                 return false;
 192         }
 193
 194         int response = atoi(first_line_tokens[1].c_str());
 195         if (response != 200) {
 196                 log(WARNING, "[%s] Non-200 response '%s' from input.",
 197                         url.c_str(), lines[0].c_str());
 198                 return false;
 199         }
 200
 201         multimap<string, string> parameters;
 202         for (size_t i = 1; i < lines.size(); ++i) {
 203                 size_t split = lines[i].find(":");
 204                 if (split == string::npos) {
 205                         log(WARNING, "[%s] Ignoring malformed HTTP response line '%s'",
 206                                 url.c_str(), lines[i].c_str());
 207                         continue;
 208                 }
 209
 210                 string key(lines[i].begin(), lines[i].begin() + split);
 211
 212                 // Skip any spaces after the colon.
 213                 do {
 214                         ++split;
 215                 } while (split < lines[i].size() && lines[i][split] == ' ');
 216
 217                 string value(lines[i].begin() + split, lines[i].end());
 218
 219                 // Remove “Content-encoding: metacube”.
 220                 // TODO: Make case-insensitive.
 221                 if (key == "Content-encoding" && value == "metacube") {
 222                         continue;
 223                 }
 224
 225                 parameters.insert(make_pair(key, value));
 226         }
 227
 228         // Change “Server: foo” to “Server: metacube/0.1 (reflecting: foo)”
 229         // TODO: Make case-insensitive.
 230         // XXX: Use a Via: instead?
 231         if (parameters.count("Server") == 0) {
 232                 parameters.insert(make_pair("Server", SERVER_IDENTIFICATION));
 233         } else {
 234                 for (multimap<string, string>::iterator it = parameters.begin();
 235                      it != parameters.end();
 236                      ++it) {
 237                         if (it->first != "Server") {
 238                                 continue;
 239                         }
 240                         it->second = SERVER_IDENTIFICATION " (reflecting: " + it->second + ")";
 241                 }
 242         }
 243
 244         // Set “Connection: close”.
 245         // TODO: Make case-insensitive.
 246         parameters.erase("Connection");
 247         parameters.insert(make_pair("Connection", "close"));
 248
 249         // Construct the new HTTP header.
 250         http_header = "HTTP/1.0 200 OK\r\n";
 251         for (multimap<string, string>::iterator it = parameters.begin();
 252              it != parameters.end();
 253              ++it) {
 254                 http_header.append(it->first + ": " + it->second + "\r\n");
 255         }
 256
 257         for (size_t i = 0; i < stream_indices.size(); ++i) {
 258                 servers->set_header(stream_indices[i], http_header, "");
 259         }
 260
 261         return true;
 262 }
 263
 264 void HTTPInput::do_work()
 265 {
 266         while (!should_stop()) {
 267                 if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
 268                         bool activity = wait_for_activity(sock, (state == SENDING_REQUEST) ? POLLOUT : POLLIN, NULL);
 269                         if (!activity) {
 270                                 // Most likely, should_stop was set.
 271                                 continue;
 272                         }
 273                 }
 274
 275                 switch (state) {
 276                 case NOT_CONNECTED:
 277                         request.clear();
 278                         request_bytes_sent = 0;
 279                         response.clear();
 280                         pending_data.clear();
 281                         has_metacube_header = false;
 282                         for (size_t i = 0; i < stream_indices.size(); ++i) {
 283                                 servers->set_header(stream_indices[i], "", "");
 284                         }
 285
 286                         {
 287                                 string protocol;  // Thrown away.
 288                                 if (!parse_url(url, &protocol, &host, &port, &path)) {
 289                                         log(WARNING, "[%s] Failed to parse URL '%s'", url.c_str(), url.c_str());
 290                                         break;
 291                                 }
 292                         }
 293
 294                         sock = lookup_and_connect(host, port);
 295                         if (sock != -1) {
 296                                 // Yay, successful connect. Try to set it as nonblocking.
 297                                 int one = 1;
 298                                 if (ioctl(sock, FIONBIO, &one) == -1) {
 299                                         log_perror("ioctl(FIONBIO)");
 300                                         state = CLOSING_SOCKET;
 301                                 } else {
 302                                         state = SENDING_REQUEST;
 303                                         request = "GET " + path + " HTTP/1.0\r\nUser-Agent: cubemap\r\n\r\n";
 304                                         request_bytes_sent = 0;
 305                                 }
 306                         }
 307                         break;
 308                 case SENDING_REQUEST: {
 309                         size_t to_send = request.size() - request_bytes_sent;
 310                         int ret;
 311
 312                         do {
 313                                 ret = write(sock, request.data() + request_bytes_sent, to_send);
 314                         } while (ret == -1 && errno == EINTR);
 315
 316                         if (ret == -1) {
 317                                 log_perror("write");
 318                                 state = CLOSING_SOCKET;
 319                                 continue;
 320                         }
 321
 322                         assert(ret >= 0);
 323                         request_bytes_sent += ret;
 324
 325                         if (request_bytes_sent == request.size()) {
 326                                 state = RECEIVING_HEADER;
 327                         }
 328                         break;
 329                 }
 330                 case RECEIVING_HEADER: {
 331                         char buf[4096];
 332                         int ret;
 333
 334                         do {
 335                                 ret = read(sock, buf, sizeof(buf));
 336                         } while (ret == -1 && errno == EINTR);
 337
 338                         if (ret == -1) {
 339                                 log_perror("read");
 340                                 state = CLOSING_SOCKET;
 341                                 continue;
 342                         }
 343
 344                         if (ret == 0) {
 345                                 // This really shouldn't happen...
 346                                 log(ERROR, "[%s] Socket unexpectedly closed while reading header",
 347                                            url.c_str());
 348                                 state = CLOSING_SOCKET;
 349                                 continue;
 350                         }
 351
 352                         RequestParseStatus status = wait_for_double_newline(&response, buf, ret);
 353
 354                         if (status == RP_OUT_OF_SPACE) {
 355                                 log(WARNING, "[%s] Sever sent overlong HTTP response!", url.c_str());
 356                                 state = CLOSING_SOCKET;
 357                                 continue;
 358                         } else if (status == RP_NOT_FINISHED_YET) {
 359                                 continue;
 360                         }
 361
 362                         // OK, so we're fine, but there might be some of the actual data after the response.
 363                         // We'll need to deal with that separately.
 364                         string extra_data;
 365                         if (status == RP_EXTRA_DATA) {
 366                                 char *ptr = static_cast<char *>(
 367                                         memmem(response.data(), response.size(), "\r\n\r\n", 4));
 368                                 assert(ptr != NULL);
 369                                 extra_data = string(ptr + 4, &response[0] + response.size());
 370                                 response.resize(ptr - response.data());
 371                         }
 372
 373                         if (!parse_response(response)) {
 374                                 state = CLOSING_SOCKET;
 375                                 continue;
 376                         }
 377
 378                         if (!extra_data.empty()) {
 379                                 process_data(&extra_data[0], extra_data.size());
 380                         }
 381
 382                         log(INFO, "[%s] Connected to '%s', receiving data.",
 383                                    url.c_str(), url.c_str());
 384                         state = RECEIVING_DATA;
 385                         break;
 386                 }
 387                 case RECEIVING_DATA: {
 388                         char buf[4096];
 389                         int ret;
 390
 391                         do {
 392                                 ret = read(sock, buf, sizeof(buf));
 393                         } while (ret == -1 && errno == EINTR);
 394
 395                         if (ret == -1) {
 396                                 log_perror("read");
 397                                 state = CLOSING_SOCKET;
 398                                 continue;
 399                         }
 400
 401                         if (ret == 0) {
 402                                 // This really shouldn't happen...
 403                                 log(ERROR, "[%s] Socket unexpectedly closed while reading data",
 404                                            url.c_str());
 405                                 state = CLOSING_SOCKET;
 406                                 continue;
 407                         }
 408
 409                         process_data(buf, ret);
 410                         break;
 411                 }
 412                 case CLOSING_SOCKET: {
 413                         close_socket();
 414                         state = NOT_CONNECTED;
 415                         break;
 416                 }
 417                 default:
 418                         assert(false);
 419                 }
 420
 421                 // If we are still in NOT_CONNECTED, either something went wrong,
 422                 // or the connection just got closed.
 423                 // The earlier steps have already given the error message, if any.
 424                 if (state == NOT_CONNECTED && !should_stop()) {
 425                         log(INFO, "[%s] Waiting 0.2 second and restarting...", url.c_str());
 426                         timespec timeout_ts;
 427                         timeout_ts.tv_sec = 0;
 428                         timeout_ts.tv_nsec = 200000000;
 429                         wait_for_wakeup(&timeout_ts);
 430                 }
 431         }
 432 }
 433
 434 void HTTPInput::process_data(char *ptr, size_t bytes)
 435 {
 436         pending_data.insert(pending_data.end(), ptr, ptr + bytes);
 437         {
 438                 MutexLock mutex(&stats_mutex);
 439                 stats.bytes_received += bytes;
 440         }
 441
 442         for ( ;; ) {
 443                 // If we don't have enough data (yet) for even the Metacube header, just return.
 444                 if (pending_data.size() < sizeof(metacube_block_header)) {
 445                         return;
 446                 }
 447
 448                 // Make sure we have the Metacube sync header at the start.
 449                 // We may need to skip over junk data (it _should_ not happen, though).
 450                 if (!has_metacube_header) {
 451                         char *ptr = static_cast<char *>(
 452                                 memmem(pending_data.data(), pending_data.size(),
 453                                        METACUBE_SYNC, strlen(METACUBE_SYNC)));
 454                         if (ptr == NULL) {
 455                                 // OK, so we didn't find the sync marker. We know then that
 456                                 // we do not have the _full_ marker in the buffer, but we
 457                                 // could have N-1 bytes. Drop everything before that,
 458                                 // and then give up.
 459                                 drop_pending_data(pending_data.size() - (strlen(METACUBE_SYNC) - 1));
 460                                 return;
 461                         } else {
 462                                 // Yay, we found the header. Drop everything (if anything) before it.
 463                                 drop_pending_data(ptr - pending_data.data());
 464                                 has_metacube_header = true;
 465
 466                                 // Re-check that we have the entire header; we could have dropped data.
 467                                 if (pending_data.size() < sizeof(metacube_block_header)) {
 468                                         return;
 469                                 }
 470                         }
 471                 }
 472
 473                 // Now it's safe to read the header.
 474                 metacube_block_header *hdr = reinterpret_cast<metacube_block_header *>(pending_data.data());
 475                 assert(memcmp(hdr->sync, METACUBE_SYNC, sizeof(hdr->sync)) == 0);
 476                 uint32_t size = ntohl(hdr->size);
 477                 uint32_t flags = ntohl(hdr->flags);
 478
 479                 if (size > 262144) {
 480                         log(WARNING, "[%s] Metacube block of %d bytes (flags=%x); corrupted header?",
 481                                 url.c_str(), size, flags);
 482                 }
 483
 484                 // See if we have the entire block. If not, wait for more data.
 485                 if (pending_data.size() < sizeof(metacube_block_header) + size) {
 486                         return;
 487                 }
 488
 489                 // Send this block on to the servers.
 490                 {
 491                         MutexLock lock(&stats_mutex);
 492                         stats.data_bytes_received += size;
 493                 }
 494                 char *inner_data = pending_data.data() + sizeof(metacube_block_header);
 495                 if (flags & METACUBE_FLAGS_HEADER) {
 496                         string header(inner_data, inner_data + size);
 497                         for (size_t i = 0; i < stream_indices.size(); ++i) {
 498                                 servers->set_header(stream_indices[i], http_header, header);
 499                         }
 500                 } else {
 501                         StreamStartSuitability suitable_for_stream_start;
 502                         if (flags & METACUBE_FLAGS_NOT_SUITABLE_FOR_STREAM_START) {
 503                                 suitable_for_stream_start = NOT_SUITABLE_FOR_STREAM_START;
 504                         } else {
 505                                 suitable_for_stream_start = SUITABLE_FOR_STREAM_START;
 506                         }
 507                         for (size_t i = 0; i < stream_indices.size(); ++i) {
 508                                 servers->add_data(stream_indices[i], inner_data, size, suitable_for_stream_start);
 509                         }
 510                 }
 511
 512                 // Consume the block. This isn't the most efficient way of dealing with things
 513                 // should we have many blocks, but these routines don't need to be too efficient
 514                 // anyway.
 515                 pending_data.erase(pending_data.begin(), pending_data.begin() + sizeof(metacube_block_header) + size);
 516                 has_metacube_header = false;
 517         }
 518 }
 519
 520 void HTTPInput::drop_pending_data(size_t num_bytes)
 521 {
 522         if (num_bytes == 0) {
 523                 return;
 524         }
 525         log(WARNING, "[%s] Dropping %lld junk bytes from stream, maybe it is not a Metacube stream?",
 526                 url.c_str(), (long long)num_bytes);
 527         assert(pending_data.size() >= num_bytes);
 528         pending_data.erase(pending_data.begin(), pending_data.begin() + num_bytes);
 529 }
 530
 531 InputStats HTTPInput::get_stats() const
 532 {
 533         MutexLock lock(&stats_mutex);
 534         return stats;
 535 }