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         stats.connect_time = -1;
  43 }
  44
  45 HTTPInput::HTTPInput(const InputProto &serialized)
  46         : state(State(serialized.state())),
  47           url(serialized.url()),
  48           request(serialized.request()),
  49           request_bytes_sent(serialized.request_bytes_sent()),
  50           response(serialized.response()),
  51           http_header(serialized.http_header()),
  52           has_metacube_header(serialized.has_metacube_header()),
  53           sock(serialized.sock())
  54 {
  55         pending_data.resize(serialized.pending_data().size());
  56         memcpy(&pending_data[0], serialized.pending_data().data(), serialized.pending_data().size());
  57
  58         string protocol;
  59         parse_url(url, &protocol, &host, &port, &path);  // Don't care if it fails.
  60
  61         // Older versions stored the extra \r\n in the HTTP header.
  62         // Strip it if we find it.
  63         if (http_header.size() >= 4 &&
  64             memcmp(http_header.data() + http_header.size() - 4, "\r\n\r\n", 4) == 0) {
  65                 http_header.resize(http_header.size() - 2);
  66         }
  67
  68         pthread_mutex_init(&stats_mutex, NULL);
  69         stats.url = url;
  70         stats.bytes_received = serialized.bytes_received();
  71         stats.data_bytes_received = serialized.data_bytes_received();
  72         if (serialized.has_connect_time()) {
  73                 stats.connect_time = serialized.connect_time();
  74         } else {
  75                 stats.connect_time = time(NULL);
  76         }
  77 }
  78
  79 void HTTPInput::close_socket()
  80 {
  81         if (sock != -1) {
  82                 safe_close(sock);
  83         }
  84
  85         MutexLock lock(&stats_mutex);
  86         stats.connect_time = -1;
  87 }
  88
  89 InputProto HTTPInput::serialize() const
  90 {
  91         InputProto serialized;
  92         serialized.set_state(state);
  93         serialized.set_url(url);
  94         serialized.set_request(request);
  95         serialized.set_request_bytes_sent(request_bytes_sent);
  96         serialized.set_response(response);
  97         serialized.set_http_header(http_header);
  98         serialized.set_pending_data(string(pending_data.begin(), pending_data.end()));
  99         serialized.set_has_metacube_header(has_metacube_header);
 100         serialized.set_sock(sock);
 101         serialized.set_bytes_received(stats.bytes_received);
 102         serialized.set_data_bytes_received(stats.data_bytes_received);
 103         serialized.set_connect_time(stats.connect_time);
 104         return serialized;
 105 }
 106
 107 int HTTPInput::lookup_and_connect(const string &host, const string &port)
 108 {
 109         addrinfo *ai;
 110         int err = getaddrinfo(host.c_str(), port.c_str(), NULL, &ai);
 111         if (err != 0) {
 112                 log(WARNING, "[%s] Lookup of '%s' failed (%s).",
 113                         url.c_str(), host.c_str(), gai_strerror(err));
 114                 return -1;
 115         }
 116
 117         addrinfo *base_ai = ai;
 118
 119         // Connect to everything in turn until we have a socket.
 120         for ( ; ai && !should_stop(); ai = ai->ai_next) {
 121                 int sock = socket(ai->ai_family, SOCK_STREAM, IPPROTO_TCP);
 122                 if (sock == -1) {
 123                         // Could be e.g. EPROTONOSUPPORT. The show must go on.
 124                         continue;
 125                 }
 126
 127                 // Now do a non-blocking connect. This is important because we want to be able to be
 128                 // woken up, even though it's rather cumbersome.
 129
 130                 // Set the socket as nonblocking.
 131                 int one = 1;
 132                 if (ioctl(sock, FIONBIO, &one) == -1) {
 133                         log_perror("ioctl(FIONBIO)");
 134                         safe_close(sock);
 135                         return -1;
 136                 }
 137
 138                 // Do a non-blocking connect.
 139                 do {
 140                         err = connect(sock, ai->ai_addr, ai->ai_addrlen);
 141                 } while (err == -1 && errno == EINTR);
 142
 143                 if (err == -1 && errno != EINPROGRESS) {
 144                         log_perror("connect");
 145                         safe_close(sock);
 146                         continue;
 147                 }
 148
 149                 // Wait for the connect to complete, or an error to happen.
 150                 for ( ;; ) {
 151                         bool complete = wait_for_activity(sock, POLLIN | POLLOUT, NULL);
 152                         if (should_stop()) {
 153                                 safe_close(sock);
 154                                 return -1;
 155                         }
 156                         if (complete) {
 157                                 break;
 158                         }
 159                 }
 160
 161                 // Check whether it ended in an error or not.
 162                 socklen_t err_size = sizeof(err);
 163                 if (getsockopt(sock, SOL_SOCKET, SO_ERROR, &err, &err_size) == -1) {
 164                         log_perror("getsockopt");
 165                         safe_close(sock);
 166                         continue;
 167                 }
 168
 169                 errno = err;
 170
 171                 if (err == 0) {
 172                         // Successful connect.
 173                         freeaddrinfo(base_ai);
 174                         return sock;
 175                 }
 176
 177                 safe_close(sock);
 178         }
 179
 180         // Give the last one as error.
 181         log(WARNING, "[%s] Connect to '%s' failed (%s)",
 182                 url.c_str(), host.c_str(), strerror(errno));
 183         freeaddrinfo(base_ai);
 184         return -1;
 185 }
 186
 187 bool HTTPInput::parse_response(const std::string &request)
 188 {
 189         vector<string> lines = split_lines(response);
 190         if (lines.empty()) {
 191                 log(WARNING, "[%s] Empty HTTP response from input.", url.c_str());
 192                 return false;
 193         }
 194
 195         vector<string> first_line_tokens = split_tokens(lines[0]);
 196         if (first_line_tokens.size() < 2) {
 197                 log(WARNING, "[%s] Malformed response line '%s' from input.",
 198                         url.c_str(), lines[0].c_str());
 199                 return false;
 200         }
 201
 202         int response = atoi(first_line_tokens[1].c_str());
 203         if (response != 200) {
 204                 log(WARNING, "[%s] Non-200 response '%s' from input.",
 205                         url.c_str(), lines[0].c_str());
 206                 return false;
 207         }
 208
 209         multimap<string, string> parameters;
 210         for (size_t i = 1; i < lines.size(); ++i) {
 211                 size_t split = lines[i].find(":");
 212                 if (split == string::npos) {
 213                         log(WARNING, "[%s] Ignoring malformed HTTP response line '%s'",
 214                                 url.c_str(), lines[i].c_str());
 215                         continue;
 216                 }
 217
 218                 string key(lines[i].begin(), lines[i].begin() + split);
 219
 220                 // Skip any spaces after the colon.
 221                 do {
 222                         ++split;
 223                 } while (split < lines[i].size() && lines[i][split] == ' ');
 224
 225                 string value(lines[i].begin() + split, lines[i].end());
 226
 227                 // Remove “Content-encoding: metacube”.
 228                 // TODO: Make case-insensitive.
 229                 if (key == "Content-encoding" && value == "metacube") {
 230                         continue;
 231                 }
 232
 233                 parameters.insert(make_pair(key, value));
 234         }
 235
 236         // Change “Server: foo” to “Server: metacube/0.1 (reflecting: foo)”
 237         // TODO: Make case-insensitive.
 238         // XXX: Use a Via: instead?
 239         if (parameters.count("Server") == 0) {
 240                 parameters.insert(make_pair("Server", SERVER_IDENTIFICATION));
 241         } else {
 242                 for (multimap<string, string>::iterator it = parameters.begin();
 243                      it != parameters.end();
 244                      ++it) {
 245                         if (it->first != "Server") {
 246                                 continue;
 247                         }
 248                         it->second = SERVER_IDENTIFICATION " (reflecting: " + it->second + ")";
 249                 }
 250         }
 251
 252         // Set “Connection: close”.
 253         // TODO: Make case-insensitive.
 254         parameters.erase("Connection");
 255         parameters.insert(make_pair("Connection", "close"));
 256
 257         // Construct the new HTTP header.
 258         http_header = "HTTP/1.0 200 OK\r\n";
 259         for (multimap<string, string>::iterator it = parameters.begin();
 260              it != parameters.end();
 261              ++it) {
 262                 http_header.append(it->first + ": " + it->second + "\r\n");
 263         }
 264
 265         for (size_t i = 0; i < stream_indices.size(); ++i) {
 266                 servers->set_header(stream_indices[i], http_header, "");
 267         }
 268
 269         return true;
 270 }
 271
 272 void HTTPInput::do_work()
 273 {
 274         while (!should_stop()) {
 275                 if (state == SENDING_REQUEST || state == RECEIVING_HEADER || state == RECEIVING_DATA) {
 276                         bool activity = wait_for_activity(sock, (state == SENDING_REQUEST) ? POLLOUT : POLLIN, NULL);
 277                         if (!activity) {
 278                                 // Most likely, should_stop was set.
 279                                 continue;
 280                         }
 281                 }
 282
 283                 switch (state) {
 284                 case NOT_CONNECTED:
 285                         request.clear();
 286                         request_bytes_sent = 0;
 287                         response.clear();
 288                         pending_data.clear();
 289                         has_metacube_header = false;
 290                         for (size_t i = 0; i < stream_indices.size(); ++i) {
 291                                 servers->set_header(stream_indices[i], "", "");
 292                         }
 293
 294                         {
 295                                 string protocol;  // Thrown away.
 296                                 if (!parse_url(url, &protocol, &host, &port, &path)) {
 297                                         log(WARNING, "[%s] Failed to parse URL '%s'", url.c_str(), url.c_str());
 298                                         break;
 299                                 }
 300                         }
 301
 302                         sock = lookup_and_connect(host, port);
 303                         if (sock != -1) {
 304                                 // Yay, successful connect. Try to set it as nonblocking.
 305                                 int one = 1;
 306                                 if (ioctl(sock, FIONBIO, &one) == -1) {
 307                                         log_perror("ioctl(FIONBIO)");
 308                                         state = CLOSING_SOCKET;
 309                                 } else {
 310                                         state = SENDING_REQUEST;
 311                                         request = "GET " + path + " HTTP/1.0\r\nUser-Agent: cubemap\r\n\r\n";
 312                                         request_bytes_sent = 0;
 313                                 }
 314
 315                                 MutexLock lock(&stats_mutex);
 316                                 stats.connect_time = time(NULL);
 317                         }
 318                         break;
 319                 case SENDING_REQUEST: {
 320                         size_t to_send = request.size() - request_bytes_sent;
 321                         int ret;
 322
 323                         do {
 324                                 ret = write(sock, request.data() + request_bytes_sent, to_send);
 325                         } while (ret == -1 && errno == EINTR);
 326
 327                         if (ret == -1) {
 328                                 log_perror("write");
 329                                 state = CLOSING_SOCKET;
 330                                 continue;
 331                         }
 332
 333                         assert(ret >= 0);
 334                         request_bytes_sent += ret;
 335
 336                         if (request_bytes_sent == request.size()) {
 337                                 state = RECEIVING_HEADER;
 338                         }
 339                         break;
 340                 }
 341                 case RECEIVING_HEADER: {
 342                         char buf[4096];
 343                         int ret;
 344
 345                         do {
 346                                 ret = read(sock, buf, sizeof(buf));
 347                         } while (ret == -1 && errno == EINTR);
 348
 349                         if (ret == -1) {
 350                                 log_perror("read");
 351                                 state = CLOSING_SOCKET;
 352                                 continue;
 353                         }
 354
 355                         if (ret == 0) {
 356                                 // This really shouldn't happen...
 357                                 log(ERROR, "[%s] Socket unexpectedly closed while reading header",
 358                                            url.c_str());
 359                                 state = CLOSING_SOCKET;
 360                                 continue;
 361                         }
 362
 363                         RequestParseStatus status = wait_for_double_newline(&response, buf, ret);
 364
 365                         if (status == RP_OUT_OF_SPACE) {
 366                                 log(WARNING, "[%s] Sever sent overlong HTTP response!", url.c_str());
 367                                 state = CLOSING_SOCKET;
 368                                 continue;
 369                         } else if (status == RP_NOT_FINISHED_YET) {
 370                                 continue;
 371                         }
 372
 373                         // OK, so we're fine, but there might be some of the actual data after the response.
 374                         // We'll need to deal with that separately.
 375                         string extra_data;
 376                         if (status == RP_EXTRA_DATA) {
 377                                 char *ptr = static_cast<char *>(
 378                                         memmem(response.data(), response.size(), "\r\n\r\n", 4));
 379                                 assert(ptr != NULL);
 380                                 extra_data = string(ptr + 4, &response[0] + response.size());
 381                                 response.resize(ptr - response.data());
 382                         }
 383
 384                         if (!parse_response(response)) {
 385                                 state = CLOSING_SOCKET;
 386                                 continue;
 387                         }
 388
 389                         if (!extra_data.empty()) {
 390                                 process_data(&extra_data[0], extra_data.size());
 391                         }
 392
 393                         log(INFO, "[%s] Connected to '%s', receiving data.",
 394                                    url.c_str(), url.c_str());
 395                         state = RECEIVING_DATA;
 396                         break;
 397                 }
 398                 case RECEIVING_DATA: {
 399                         char buf[4096];
 400                         int ret;
 401
 402                         do {
 403                                 ret = read(sock, buf, sizeof(buf));
 404                         } while (ret == -1 && errno == EINTR);
 405
 406                         if (ret == -1) {
 407                                 log_perror("read");
 408                                 state = CLOSING_SOCKET;
 409                                 continue;
 410                         }
 411
 412                         if (ret == 0) {
 413                                 // This really shouldn't happen...
 414                                 log(ERROR, "[%s] Socket unexpectedly closed while reading data",
 415                                            url.c_str());
 416                                 state = CLOSING_SOCKET;
 417                                 continue;
 418                         }
 419
 420                         process_data(buf, ret);
 421                         break;
 422                 }
 423                 case CLOSING_SOCKET: {
 424                         close_socket();
 425                         state = NOT_CONNECTED;
 426                         break;
 427                 }
 428                 default:
 429                         assert(false);
 430                 }
 431
 432                 // If we are still in NOT_CONNECTED, either something went wrong,
 433                 // or the connection just got closed.
 434                 // The earlier steps have already given the error message, if any.
 435                 if (state == NOT_CONNECTED && !should_stop()) {
 436                         log(INFO, "[%s] Waiting 0.2 second and restarting...", url.c_str());
 437                         timespec timeout_ts;
 438                         timeout_ts.tv_sec = 0;
 439                         timeout_ts.tv_nsec = 200000000;
 440                         wait_for_wakeup(&timeout_ts);
 441                 }
 442         }
 443 }
 444
 445 void HTTPInput::process_data(char *ptr, size_t bytes)
 446 {
 447         pending_data.insert(pending_data.end(), ptr, ptr + bytes);
 448         {
 449                 MutexLock mutex(&stats_mutex);
 450                 stats.bytes_received += bytes;
 451         }
 452
 453         for ( ;; ) {
 454                 // If we don't have enough data (yet) for even the Metacube header, just return.
 455                 if (pending_data.size() < sizeof(metacube_block_header)) {
 456                         return;
 457                 }
 458
 459                 // Make sure we have the Metacube sync header at the start.
 460                 // We may need to skip over junk data (it _should_ not happen, though).
 461                 if (!has_metacube_header) {
 462                         char *ptr = static_cast<char *>(
 463                                 memmem(pending_data.data(), pending_data.size(),
 464                                        METACUBE_SYNC, strlen(METACUBE_SYNC)));
 465                         if (ptr == NULL) {
 466                                 // OK, so we didn't find the sync marker. We know then that
 467                                 // we do not have the _full_ marker in the buffer, but we
 468                                 // could have N-1 bytes. Drop everything before that,
 469                                 // and then give up.
 470                                 drop_pending_data(pending_data.size() - (strlen(METACUBE_SYNC) - 1));
 471                                 return;
 472                         } else {
 473                                 // Yay, we found the header. Drop everything (if anything) before it.
 474                                 drop_pending_data(ptr - pending_data.data());
 475                                 has_metacube_header = true;
 476
 477                                 // Re-check that we have the entire header; we could have dropped data.
 478                                 if (pending_data.size() < sizeof(metacube_block_header)) {
 479                                         return;
 480                                 }
 481                         }
 482                 }
 483
 484                 // Now it's safe to read the header.
 485                 metacube_block_header *hdr = reinterpret_cast<metacube_block_header *>(pending_data.data());
 486                 assert(memcmp(hdr->sync, METACUBE_SYNC, sizeof(hdr->sync)) == 0);
 487                 uint32_t size = ntohl(hdr->size);
 488                 uint32_t flags = ntohl(hdr->flags);
 489
 490                 if (size > 262144) {
 491                         log(WARNING, "[%s] Metacube block of %d bytes (flags=%x); corrupted header?",
 492                                 url.c_str(), size, flags);
 493                 }
 494
 495                 // See if we have the entire block. If not, wait for more data.
 496                 if (pending_data.size() < sizeof(metacube_block_header) + size) {
 497                         return;
 498                 }
 499
 500                 // Send this block on to the servers.
 501                 {
 502                         MutexLock lock(&stats_mutex);
 503                         stats.data_bytes_received += size;
 504                 }
 505                 char *inner_data = pending_data.data() + sizeof(metacube_block_header);
 506                 if (flags & METACUBE_FLAGS_HEADER) {
 507                         string header(inner_data, inner_data + size);
 508                         for (size_t i = 0; i < stream_indices.size(); ++i) {
 509                                 servers->set_header(stream_indices[i], http_header, header);
 510                         }
 511                 } else {
 512                         StreamStartSuitability suitable_for_stream_start;
 513                         if (flags & METACUBE_FLAGS_NOT_SUITABLE_FOR_STREAM_START) {
 514                                 suitable_for_stream_start = NOT_SUITABLE_FOR_STREAM_START;
 515                         } else {
 516                                 suitable_for_stream_start = SUITABLE_FOR_STREAM_START;
 517                         }
 518                         for (size_t i = 0; i < stream_indices.size(); ++i) {
 519                                 servers->add_data(stream_indices[i], inner_data, size, suitable_for_stream_start);
 520                         }
 521                 }
 522
 523                 // Consume the block. This isn't the most efficient way of dealing with things
 524                 // should we have many blocks, but these routines don't need to be too efficient
 525                 // anyway.
 526                 pending_data.erase(pending_data.begin(), pending_data.begin() + sizeof(metacube_block_header) + size);
 527                 has_metacube_header = false;
 528         }
 529 }
 530
 531 void HTTPInput::drop_pending_data(size_t num_bytes)
 532 {
 533         if (num_bytes == 0) {
 534                 return;
 535         }
 536         log(WARNING, "[%s] Dropping %lld junk bytes from stream, maybe it is not a Metacube stream?",
 537                 url.c_str(), (long long)num_bytes);
 538         assert(pending_data.size() >= num_bytes);
 539         pending_data.erase(pending_data.begin(), pending_data.begin() + num_bytes);
 540 }
 541
 542 InputStats HTTPInput::get_stats() const
 543 {
 544         MutexLock lock(&stats_mutex);
 545         return stats;
 546 }