Andrew's git / gitweb.git / http.c
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http.con commit Merge http://www.kernel.org/pub/scm/gitk/gitk (8fc66df)
   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;
  28struct curl_slist *no_range_header;
  29
  30struct active_request_slot *active_queue_head = NULL;
  31
  32size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb,
  33                           struct buffer *buffer)
  34{
  35        size_t size = eltsize * nmemb;
  36        if (size > buffer->size - buffer->posn)
  37                size = buffer->size - buffer->posn;
  38        memcpy(ptr, buffer->buffer + buffer->posn, size);
  39        buffer->posn += size;
  40        return size;
  41}
  42
  43size_t fwrite_buffer(const void *ptr, size_t eltsize,
  44                            size_t nmemb, struct buffer *buffer)
  45{
  46        size_t size = eltsize * nmemb;
  47        if (size > buffer->size - buffer->posn) {
  48                buffer->size = buffer->size * 3 / 2;
  49                if (buffer->size < buffer->posn + size)
  50                        buffer->size = buffer->posn + size;
  51                buffer->buffer = xrealloc(buffer->buffer, buffer->size);
  52        }
  53        memcpy(buffer->buffer + buffer->posn, ptr, size);
  54        buffer->posn += size;
  55        data_received++;
  56        return size;
  57}
  58
  59size_t fwrite_null(const void *ptr, size_t eltsize,
  60                          size_t nmemb, struct buffer *buffer)
  61{
  62        data_received++;
  63        return eltsize * nmemb;
  64}
  65
  66static void finish_active_slot(struct active_request_slot *slot);
  67
  68#ifdef USE_CURL_MULTI
  69static void process_curl_messages(void)
  70{
  71        int num_messages;
  72        struct active_request_slot *slot;
  73        CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
  74
  75        while (curl_message != NULL) {
  76                if (curl_message->msg == CURLMSG_DONE) {
  77                        int curl_result = curl_message->data.result;
  78                        slot = active_queue_head;
  79                        while (slot != NULL &&
  80                               slot->curl != curl_message->easy_handle)
  81                                slot = slot->next;
  82                        if (slot != NULL) {
  83                                curl_multi_remove_handle(curlm, slot->curl);
  84                                slot->curl_result = curl_result;
  85                                finish_active_slot(slot);
  86                        } else {
  87                                fprintf(stderr, "Received DONE message for unknown request!\n");
  88                        }
  89                } else {
  90                        fprintf(stderr, "Unknown CURL message received: %d\n",
  91                                (int)curl_message->msg);
  92                }
  93                curl_message = curl_multi_info_read(curlm, &num_messages);
  94        }
  95}
  96#endif
  97
  98static int http_options(const char *var, const char *value)
  99{
 100        if (!strcmp("http.sslverify", var)) {
 101                if (curl_ssl_verify == -1) {
 102                        curl_ssl_verify = git_config_bool(var, value);
 103                }
 104                return 0;
 105        }
 106
 107        if (!strcmp("http.sslcert", var)) {
 108                if (ssl_cert == NULL) {
 109                        ssl_cert = xmalloc(strlen(value)+1);
 110                        strcpy(ssl_cert, value);
 111                }
 112                return 0;
 113        }
 114#if LIBCURL_VERSION_NUM >= 0x070902
 115        if (!strcmp("http.sslkey", var)) {
 116                if (ssl_key == NULL) {
 117                        ssl_key = xmalloc(strlen(value)+1);
 118                        strcpy(ssl_key, value);
 119                }
 120                return 0;
 121        }
 122#endif
 123#if LIBCURL_VERSION_NUM >= 0x070908
 124        if (!strcmp("http.sslcapath", var)) {
 125                if (ssl_capath == NULL) {
 126                        ssl_capath = xmalloc(strlen(value)+1);
 127                        strcpy(ssl_capath, value);
 128                }
 129                return 0;
 130        }
 131#endif
 132        if (!strcmp("http.sslcainfo", var)) {
 133                if (ssl_cainfo == NULL) {
 134                        ssl_cainfo = xmalloc(strlen(value)+1);
 135                        strcpy(ssl_cainfo, value);
 136                }
 137                return 0;
 138        }
 139
 140#ifdef USE_CURL_MULTI   
 141        if (!strcmp("http.maxrequests", var)) {
 142                if (max_requests == -1)
 143                        max_requests = git_config_int(var, value);
 144                return 0;
 145        }
 146#endif
 147
 148        if (!strcmp("http.lowspeedlimit", var)) {
 149                if (curl_low_speed_limit == -1)
 150                        curl_low_speed_limit = (long)git_config_int(var, value);
 151                return 0;
 152        }
 153        if (!strcmp("http.lowspeedtime", var)) {
 154                if (curl_low_speed_time == -1)
 155                        curl_low_speed_time = (long)git_config_int(var, value);
 156                return 0;
 157        }
 158
 159        /* Fall back on the default ones */
 160        return git_default_config(var, value);
 161}
 162
 163static CURL* get_curl_handle(void)
 164{
 165        CURL* result = curl_easy_init();
 166
 167        curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
 168#if LIBCURL_VERSION_NUM >= 0x070907
 169        curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
 170#endif
 171
 172        if (ssl_cert != NULL)
 173                curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
 174#if LIBCURL_VERSION_NUM >= 0x070902
 175        if (ssl_key != NULL)
 176                curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
 177#endif
 178#if LIBCURL_VERSION_NUM >= 0x070908
 179        if (ssl_capath != NULL)
 180                curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
 181#endif
 182        if (ssl_cainfo != NULL)
 183                curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
 184        curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
 185
 186        if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
 187                curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
 188                                 curl_low_speed_limit);
 189                curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
 190                                 curl_low_speed_time);
 191        }
 192
 193        curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
 194
 195        return result;
 196}
 197
 198void http_init(void)
 199{
 200        char *low_speed_limit;
 201        char *low_speed_time;
 202
 203        curl_global_init(CURL_GLOBAL_ALL);
 204
 205        pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
 206        no_range_header = curl_slist_append(no_range_header, "Range:");
 207
 208#ifdef USE_CURL_MULTI
 209        {
 210                char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
 211                if (http_max_requests != NULL)
 212                        max_requests = atoi(http_max_requests);
 213        }
 214
 215        curlm = curl_multi_init();
 216        if (curlm == NULL) {
 217                fprintf(stderr, "Error creating curl multi handle.\n");
 218                exit(1);
 219        }
 220#endif
 221
 222        if (getenv("GIT_SSL_NO_VERIFY"))
 223                curl_ssl_verify = 0;
 224
 225        ssl_cert = getenv("GIT_SSL_CERT");
 226#if LIBCURL_VERSION_NUM >= 0x070902
 227        ssl_key = getenv("GIT_SSL_KEY");
 228#endif
 229#if LIBCURL_VERSION_NUM >= 0x070908
 230        ssl_capath = getenv("GIT_SSL_CAPATH");
 231#endif
 232        ssl_cainfo = getenv("GIT_SSL_CAINFO");
 233
 234        low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
 235        if (low_speed_limit != NULL)
 236                curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
 237        low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
 238        if (low_speed_time != NULL)
 239                curl_low_speed_time = strtol(low_speed_time, NULL, 10);
 240
 241        git_config(http_options);
 242
 243        if (curl_ssl_verify == -1)
 244                curl_ssl_verify = 1;
 245
 246#ifdef USE_CURL_MULTI
 247        if (max_requests < 1)
 248                max_requests = DEFAULT_MAX_REQUESTS;
 249#endif
 250
 251#ifndef NO_CURL_EASY_DUPHANDLE
 252        curl_default = get_curl_handle();
 253#endif
 254}
 255
 256void http_cleanup(void)
 257{
 258        struct active_request_slot *slot = active_queue_head;
 259#ifdef USE_CURL_MULTI
 260        char *wait_url;
 261#endif
 262
 263        while (slot != NULL) {
 264#ifdef USE_CURL_MULTI
 265                if (slot->in_use) {
 266                        curl_easy_getinfo(slot->curl,
 267                                          CURLINFO_EFFECTIVE_URL,
 268                                          &wait_url);
 269                        fprintf(stderr, "Waiting for %s\n", wait_url);
 270                        run_active_slot(slot);
 271                }
 272#endif
 273                if (slot->curl != NULL)
 274                        curl_easy_cleanup(slot->curl);
 275                slot = slot->next;
 276        }
 277
 278#ifndef NO_CURL_EASY_DUPHANDLE
 279        curl_easy_cleanup(curl_default);
 280#endif
 281
 282#ifdef USE_CURL_MULTI
 283        curl_multi_cleanup(curlm);
 284#endif
 285        curl_global_cleanup();
 286        
 287}
 288
 289struct active_request_slot *get_active_slot(void)
 290{
 291        struct active_request_slot *slot = active_queue_head;
 292        struct active_request_slot *newslot;
 293
 294#ifdef USE_CURL_MULTI
 295        int num_transfers;
 296
 297        /* Wait for a slot to open up if the queue is full */
 298        while (active_requests >= max_requests) {
 299                curl_multi_perform(curlm, &num_transfers);
 300                if (num_transfers < active_requests) {
 301                        process_curl_messages();
 302                }
 303        }
 304#endif
 305
 306        while (slot != NULL && slot->in_use) {
 307                slot = slot->next;
 308        }
 309        if (slot == NULL) {
 310                newslot = xmalloc(sizeof(*newslot));
 311                newslot->curl = NULL;
 312                newslot->in_use = 0;
 313                newslot->next = NULL;
 314
 315                slot = active_queue_head;
 316                if (slot == NULL) {
 317                        active_queue_head = newslot;
 318                } else {
 319                        while (slot->next != NULL) {
 320                                slot = slot->next;
 321                        }
 322                        slot->next = newslot;
 323                }
 324                slot = newslot;
 325        }
 326
 327        if (slot->curl == NULL) {
 328#ifdef NO_CURL_EASY_DUPHANDLE
 329                slot->curl = get_curl_handle();
 330#else
 331                slot->curl = curl_easy_duphandle(curl_default);
 332#endif
 333        }
 334
 335        active_requests++;
 336        slot->in_use = 1;
 337        slot->local = NULL;
 338        slot->callback_data = NULL;
 339        slot->callback_func = NULL;
 340        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
 341        curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_range_header);
 342        curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
 343
 344        return slot;
 345}
 346
 347int start_active_slot(struct active_request_slot *slot)
 348{
 349#ifdef USE_CURL_MULTI
 350        CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
 351
 352        if (curlm_result != CURLM_OK &&
 353            curlm_result != CURLM_CALL_MULTI_PERFORM) {
 354                active_requests--;
 355                slot->in_use = 0;
 356                return 0;
 357        }
 358#endif
 359        return 1;
 360}
 361
 362#ifdef USE_CURL_MULTI
 363void step_active_slots(void)
 364{
 365        int num_transfers;
 366        CURLMcode curlm_result;
 367
 368        do {
 369                curlm_result = curl_multi_perform(curlm, &num_transfers);
 370        } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
 371        if (num_transfers < active_requests) {
 372                process_curl_messages();
 373                fill_active_slots();
 374        }
 375}
 376#endif
 377
 378void run_active_slot(struct active_request_slot *slot)
 379{
 380#ifdef USE_CURL_MULTI
 381        long last_pos = 0;
 382        long current_pos;
 383        fd_set readfds;
 384        fd_set writefds;
 385        fd_set excfds;
 386        int max_fd;
 387        struct timeval select_timeout;
 388
 389        while (slot->in_use) {
 390                data_received = 0;
 391                step_active_slots();
 392
 393                if (!data_received && slot->local != NULL) {
 394                        current_pos = ftell(slot->local);
 395                        if (current_pos > last_pos)
 396                                data_received++;
 397                        last_pos = current_pos;
 398                }
 399
 400                if (slot->in_use && !data_received) {
 401                        max_fd = 0;
 402                        FD_ZERO(&readfds);
 403                        FD_ZERO(&writefds);
 404                        FD_ZERO(&excfds);
 405                        select_timeout.tv_sec = 0;
 406                        select_timeout.tv_usec = 50000;
 407                        select(max_fd, &readfds, &writefds,
 408                               &excfds, &select_timeout);
 409                }
 410        }
 411#else
 412        while (slot->in_use) {
 413                slot->curl_result = curl_easy_perform(slot->curl);
 414                finish_active_slot(slot);
 415        }
 416#endif
 417}
 418
 419static void finish_active_slot(struct active_request_slot *slot)
 420{
 421        active_requests--;
 422        slot->in_use = 0;
 423        curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
 424 
 425        /* Run callback if appropriate */
 426        if (slot->callback_func != NULL) {
 427                slot->callback_func(slot->callback_data);
 428        }
 429}
 430
 431void finish_all_active_slots(void)
 432{
 433        struct active_request_slot *slot = active_queue_head;
 434
 435        while (slot != NULL)
 436                if (slot->in_use) {
 437                        run_active_slot(slot);
 438                        slot = active_queue_head;
 439                } else {
 440                        slot = slot->next;
 441                }
 442}