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