Andrew's git / gitweb.git / http.c
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http.con commit Make index file locking code reusable to others. (021b6e4)
   1#include "http.h"
   2
   3int data_received;
   4int active_requests = 0;
   5
   6#ifdef USE_CURL_MULTI
   7int max_requests = -1;
   8CURLM *curlm;
   9#endif
  10#ifndef NO_CURL_EASY_DUPHANDLE
  11CURL *curl_default;
  12#endif
  13char curl_errorstr[CURL_ERROR_SIZE];
  14
  15int curl_ssl_verify = -1;
  16char *ssl_cert = NULL;
  17#if LIBCURL_VERSION_NUM >= 0x070902
  18char *ssl_key = NULL;
  19#endif
  20#if LIBCURL_VERSION_NUM >= 0x070908
  21char *ssl_capath = NULL;
  22#endif
  23char *ssl_cainfo = NULL;
  24long curl_low_speed_limit = -1;
  25long curl_low_speed_time = -1;
  26
  27struct curl_slist *pragma_header;
  28
  29struct active_request_slot *active_queue_head = NULL;
  30
  31size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb,
  32                           struct buffer *buffer)
  33{
  34        size_t size = eltsize * nmemb;
  35        if (size > buffer->size - buffer->posn)
  36                size = buffer->size - buffer->posn;
  37        memcpy(ptr, buffer->buffer + buffer->posn, size);
  38        buffer->posn += size;
  39        return size;
  40}
  41
  42size_t fwrite_buffer(const void *ptr, size_t eltsize,
  43                            size_t nmemb, struct buffer *buffer)
  44{
  45        size_t size = eltsize * nmemb;
  46        if (size > buffer->size - buffer->posn) {
  47                buffer->size = buffer->size * 3 / 2;
  48                if (buffer->size < buffer->posn + size)
  49                        buffer->size = buffer->posn + size;
  50                buffer->buffer = xrealloc(buffer->buffer, buffer->size);
  51        }
  52        memcpy(buffer->buffer + buffer->posn, ptr, size);
  53        buffer->posn += size;
  54        data_received++;
  55        return size;
  56}
  57
  58size_t fwrite_null(const void *ptr, size_t eltsize,
  59                          size_t nmemb, struct buffer *buffer)
  60{
  61        data_received++;
  62        return eltsize * nmemb;
  63}
  64
  65static void finish_active_slot(struct active_request_slot *slot);
  66
  67#ifdef USE_CURL_MULTI
  68static void process_curl_messages(void)
  69{
  70        int num_messages;
  71        struct active_request_slot *slot;
  72        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
  73
  74        while (curl_message != NULL) {
  75                if (curl_message->msg == CURLMSG_DONE) {
  76                        int curl_result = curl_message->data.result;
  77                        slot = active_queue_head;
  78                        while (slot != NULL &&
  79                               slot->curl != curl_message->easy_handle)
  80                                slot = slot->next;
  81                        if (slot != NULL) {
  82                                curl_multi_remove_handle(curlm, slot->curl);
  83                                slot->curl_result = curl_result;
  84                                finish_active_slot(slot);
  85                        } else {
  86                                fprintf(stderr, "Received DONE message for unknown request!\n");
  87                        }
  88                } else {
  89                        fprintf(stderr, "Unknown CURL message received: %d\n",
  90                                (int)curl_message->msg);
  91                }
  92                curl_message = curl_multi_info_read(curlm, &num_messages);
  93        }
  94}
  95#endif
  96
  97static int http_options(const char *var, const char *value)
  98{
  99        if (!strcmp("http.sslverify", var)) {
 100                if (curl_ssl_verify == -1) {
 101                        curl_ssl_verify = git_config_bool(var, value);
 102                }
 103                return 0;
 104        }
 105
 106        if (!strcmp("http.sslcert", var)) {
 107                if (ssl_cert == NULL) {
 108                        ssl_cert = xmalloc(strlen(value)+1);
 109                        strcpy(ssl_cert, value);
 110                }
 111                return 0;
 112        }
 113#if LIBCURL_VERSION_NUM >= 0x070902
 114        if (!strcmp("http.sslkey", var)) {
 115                if (ssl_key == NULL) {
 116                        ssl_key = xmalloc(strlen(value)+1);
 117                        strcpy(ssl_key, value);
 118                }
 119                return 0;
 120        }
 121#endif
 122#if LIBCURL_VERSION_NUM >= 0x070908
 123        if (!strcmp("http.sslcapath", var)) {
 124                if (ssl_capath == NULL) {
 125                        ssl_capath = xmalloc(strlen(value)+1);
 126                        strcpy(ssl_capath, value);
 127                }
 128                return 0;
 129        }
 130#endif
 131        if (!strcmp("http.sslcainfo", var)) {
 132                if (ssl_cainfo == NULL) {
 133                        ssl_cainfo = xmalloc(strlen(value)+1);
 134                        strcpy(ssl_cainfo, value);
 135                }
 136                return 0;
 137        }
 138
 139#ifdef USE_CURL_MULTI   
 140        if (!strcmp("http.maxrequests", var)) {
 141                if (max_requests == -1)
 142                        max_requests = git_config_int(var, value);
 143                return 0;
 144        }
 145#endif
 146
 147        if (!strcmp("http.lowspeedlimit", var)) {
 148                if (curl_low_speed_limit == -1)
 149                        curl_low_speed_limit = (long)git_config_int(var, value);
 150                return 0;
 151        }
 152        if (!strcmp("http.lowspeedtime", var)) {
 153                if (curl_low_speed_time == -1)
 154                        curl_low_speed_time = (long)git_config_int(var, value);
 155                return 0;
 156        }
 157
 158        /* Fall back on the default ones */
 159        return git_default_config(var, value);
 160}
 161
 162static CURL* get_curl_handle(void)
 163{
 164        CURL* result = curl_easy_init();
 165
 166        curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
 167#if LIBCURL_VERSION_NUM >= 0x070907
 168        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 169#endif
 170
 171        if (ssl_cert != NULL)
 172                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 173#if LIBCURL_VERSION_NUM >= 0x070902
 174        if (ssl_key != NULL)
 175                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 176#endif
 177#if LIBCURL_VERSION_NUM >= 0x070908
 178        if (ssl_capath != NULL)
 179                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 180#endif
 181        if (ssl_cainfo != NULL)
 182                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 183        curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 184
 185        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 186                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 187                                 curl_low_speed_limit);
 188                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 189                                 curl_low_speed_time);
 190        }
 191
 192        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 193
 194        if (getenv("GIT_CURL_VERBOSE"))
 195                curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
 196
 197        curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
 198
 199        return result;
 200}
 201
 202void http_init(void)
 203{
 204        char *low_speed_limit;
 205        char *low_speed_time;
 206
 207        curl_global_init(CURL_GLOBAL_ALL);
 208
 209        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 210
 211#ifdef USE_CURL_MULTI
 212        {
 213                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 214                if (http_max_requests != NULL)
 215                        max_requests = atoi(http_max_requests);
 216        }
 217
 218        curlm = curl_multi_init();
 219        if (curlm == NULL) {
 220                fprintf(stderr, "Error creating curl multi handle.\n");
 221                exit(1);
 222        }
 223#endif
 224
 225        if (getenv("GIT_SSL_NO_VERIFY"))
 226                curl_ssl_verify = 0;
 227
 228        ssl_cert = getenv("GIT_SSL_CERT");
 229#if LIBCURL_VERSION_NUM >= 0x070902
 230        ssl_key = getenv("GIT_SSL_KEY");
 231#endif
 232#if LIBCURL_VERSION_NUM >= 0x070908
 233        ssl_capath = getenv("GIT_SSL_CAPATH");
 234#endif
 235        ssl_cainfo = getenv("GIT_SSL_CAINFO");
 236
 237        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 238        if (low_speed_limit != NULL)
 239                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 240        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 241        if (low_speed_time != NULL)
 242                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 243
 244        git_config(http_options);
 245
 246        if (curl_ssl_verify == -1)
 247                curl_ssl_verify = 1;
 248
 249#ifdef USE_CURL_MULTI
 250        if (max_requests < 1)
 251                max_requests = DEFAULT_MAX_REQUESTS;
 252#endif
 253
 254#ifndef NO_CURL_EASY_DUPHANDLE
 255        curl_default = get_curl_handle();
 256#endif
 257}
 258
 259void http_cleanup(void)
 260{
 261        struct active_request_slot *slot = active_queue_head;
 262#ifdef USE_CURL_MULTI
 263        char *wait_url;
 264#endif
 265
 266        while (slot != NULL) {
 267#ifdef USE_CURL_MULTI
 268                if (slot->in_use) {
 269                        curl_easy_getinfo(slot->curl,
 270                                          CURLINFO_EFFECTIVE_URL,
 271                                          &wait_url);
 272                        fprintf(stderr, "Waiting for %s\n", wait_url);
 273                        run_active_slot(slot);
 274                }
 275#endif
 276                if (slot->curl != NULL)
 277                        curl_easy_cleanup(slot->curl);
 278                slot = slot->next;
 279        }
 280
 281#ifndef NO_CURL_EASY_DUPHANDLE
 282        curl_easy_cleanup(curl_default);
 283#endif
 284
 285#ifdef USE_CURL_MULTI
 286        curl_multi_cleanup(curlm);
 287#endif
 288        curl_global_cleanup();
 289
 290        curl_slist_free_all(pragma_header);
 291}
 292
 293struct active_request_slot *get_active_slot(void)
 294{
 295        struct active_request_slot *slot = active_queue_head;
 296        struct active_request_slot *newslot;
 297
 298#ifdef USE_CURL_MULTI
 299        int num_transfers;
 300
 301        /* Wait for a slot to open up if the queue is full */
 302        while (active_requests >= max_requests) {
 303                curl_multi_perform(curlm, &num_transfers);
 304                if (num_transfers < active_requests) {
 305                        process_curl_messages();
 306                }
 307        }
 308#endif
 309
 310        while (slot != NULL && slot->in_use) {
 311                slot = slot->next;
 312        }
 313        if (slot == NULL) {
 314                newslot = xmalloc(sizeof(*newslot));
 315                newslot->curl = NULL;
 316                newslot->in_use = 0;
 317                newslot->next = NULL;
 318
 319                slot = active_queue_head;
 320                if (slot == NULL) {
 321                        active_queue_head = newslot;
 322                } else {
 323                        while (slot->next != NULL) {
 324                                slot = slot->next;
 325                        }
 326                        slot->next = newslot;
 327                }
 328                slot = newslot;
 329        }
 330
 331        if (slot->curl == NULL) {
 332#ifdef NO_CURL_EASY_DUPHANDLE
 333                slot->curl = get_curl_handle();
 334#else
 335                slot->curl = curl_easy_duphandle(curl_default);
 336#endif
 337        }
 338
 339        active_requests++;
 340        slot->in_use = 1;
 341        slot->local = NULL;
 342        slot->results = NULL;
 343        slot->finished = NULL;
 344        slot->callback_data = NULL;
 345        slot->callback_func = NULL;
 346        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
 347        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 348        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 349        curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
 350        curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
 351        curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
 352        curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
 353        curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
 354
 355        return slot;
 356}
 357
 358int start_active_slot(struct active_request_slot *slot)
 359{
 360#ifdef USE_CURL_MULTI
 361        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 362
 363        if (curlm_result != CURLM_OK &&
 364            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 365                active_requests--;
 366                slot->in_use = 0;
 367                return 0;
 368        }
 369#endif
 370        return 1;
 371}
 372
 373#ifdef USE_CURL_MULTI
 374void step_active_slots(void)
 375{
 376        int num_transfers;
 377        CURLMcode curlm_result;
 378
 379        do {
 380                curlm_result = curl_multi_perform(curlm, &num_transfers);
 381        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 382        if (num_transfers < active_requests) {
 383                process_curl_messages();
 384                fill_active_slots();
 385        }
 386}
 387#endif
 388
 389void run_active_slot(struct active_request_slot *slot)
 390{
 391#ifdef USE_CURL_MULTI
 392        long last_pos = 0;
 393        long current_pos;
 394        fd_set readfds;
 395        fd_set writefds;
 396        fd_set excfds;
 397        int max_fd;
 398        struct timeval select_timeout;
 399        int finished = 0;
 400
 401        slot->finished = &finished;
 402        while (!finished) {
 403                data_received = 0;
 404                step_active_slots();
 405
 406                if (!data_received && slot->local != NULL) {
 407                        current_pos = ftell(slot->local);
 408                        if (current_pos > last_pos)
 409                                data_received++;
 410                        last_pos = current_pos;
 411                }
 412
 413                if (slot->in_use && !data_received) {
 414                        max_fd = 0;
 415                        FD_ZERO(&readfds);
 416                        FD_ZERO(&writefds);
 417                        FD_ZERO(&excfds);
 418                        select_timeout.tv_sec = 0;
 419                        select_timeout.tv_usec = 50000;
 420                        select(max_fd, &readfds, &writefds,
 421                               &excfds, &select_timeout);
 422                }
 423        }
 424#else
 425        while (slot->in_use) {
 426                slot->curl_result = curl_easy_perform(slot->curl);
 427                finish_active_slot(slot);
 428        }
 429#endif
 430}
 431
 432static void closedown_active_slot(struct active_request_slot *slot)
 433{
 434        active_requests--;
 435        slot->in_use = 0;
 436}
 437
 438void release_active_slot(struct active_request_slot *slot)
 439{
 440        closedown_active_slot(slot);
 441        if (slot->curl) {
 442#ifdef USE_CURL_MULTI
 443                curl_multi_remove_handle(curlm, slot->curl);
 444#endif
 445                curl_easy_cleanup(slot->curl);
 446                slot->curl = NULL;
 447        }
 448#ifdef USE_CURL_MULTI
 449        fill_active_slots();
 450#endif
 451}
 452
 453static void finish_active_slot(struct active_request_slot *slot)
 454{
 455        closedown_active_slot(slot);
 456        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 457
 458        if (slot->finished != NULL)
 459                (*slot->finished) = 1;
 460
 461        /* Store slot results so they can be read after the slot is reused */
 462        if (slot->results != NULL) {
 463                slot->results->curl_result = slot->curl_result;
 464                slot->results->http_code = slot->http_code;
 465        }
 466
 467        /* Run callback if appropriate */
 468        if (slot->callback_func != NULL) {
 469                slot->callback_func(slot->callback_data);
 470        }
 471}
 472
 473void finish_all_active_slots(void)
 474{
 475        struct active_request_slot *slot = active_queue_head;
 476
 477        while (slot != NULL)
 478                if (slot->in_use) {
 479                        run_active_slot(slot);
 480                        slot = active_queue_head;
 481                } else {
 482                        slot = slot->next;
 483                }
 484}