http.h

   1 #ifndef HTTP_H
   2 #define HTTP_H
   3
   4 #include "cache.h"
   5
   6 #include <curl/curl.h>
   7 #include <curl/easy.h>
   8
   9 #include "strbuf.h"
  10 #include "remote.h"
  11
  12 /*
  13  * We detect based on the cURL version if multi-transfer is
  14  * usable in this implementation and define this symbol accordingly.
  15  * This is not something Makefile should set nor users should pass
  16  * via CFLAGS.
  17  */
  18 #undef USE_CURL_MULTI
  19
  20 #if LIBCURL_VERSION_NUM >= 0x071000
  21 #define USE_CURL_MULTI
  22 #define DEFAULT_MAX_REQUESTS 5
  23 #endif
  24
  25 #if LIBCURL_VERSION_NUM < 0x070704
  26 #define curl_global_cleanup() do { /* nothing */ } while(0)
  27 #endif
  28 #if LIBCURL_VERSION_NUM < 0x070800
  29 #define curl_global_init(a) do { /* nothing */ } while(0)
  30 #endif
  31
  32 #if (LIBCURL_VERSION_NUM < 0x070c04) || (LIBCURL_VERSION_NUM == 0x071000)
  33 #define NO_CURL_EASY_DUPHANDLE
  34 #endif
  35
  36 #if LIBCURL_VERSION_NUM < 0x070a03
  37 #define CURLE_HTTP_RETURNED_ERROR CURLE_HTTP_NOT_FOUND
  38 #endif
  39
  40 #if LIBCURL_VERSION_NUM < 0x070c03
  41 #define NO_CURL_IOCTL
  42 #endif
  43
  44 struct slot_results
  45 {
  46         CURLcode curl_result;
  47         long http_code;
  48 };
  49
  50 struct active_request_slot
  51 {
  52         CURL *curl;
  53         FILE *local;
  54         int in_use;
  55         CURLcode curl_result;
  56         long http_code;
  57         int *finished;
  58         struct slot_results *results;
  59         void *callback_data;
  60         void (*callback_func)(void *data);
  61         struct active_request_slot *next;
  62 };
  63
  64 struct buffer
  65 {
  66         struct strbuf buf;
  67         size_t posn;
  68 };
  69
  70 /* Curl request read/write callbacks */
  71 extern size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb, void *strbuf);
  72 extern size_t fwrite_buffer(const void *ptr, size_t eltsize, size_t nmemb, void *strbuf);
  73 extern size_t fwrite_null(const void *ptr, size_t eltsize, size_t nmemb, void *strbuf);
  74 #ifndef NO_CURL_IOCTL
  75 extern curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp);
  76 #endif
  77
  78 /* Slot lifecycle functions */
  79 extern struct active_request_slot *get_active_slot(void);
  80 extern int start_active_slot(struct active_request_slot *slot);
  81 extern void run_active_slot(struct active_request_slot *slot);
  82 extern void finish_active_slot(struct active_request_slot *slot);
  83 extern void finish_all_active_slots(void);
  84 extern void release_active_slot(struct active_request_slot *slot);
  85
  86 #ifdef USE_CURL_MULTI
  87 extern void fill_active_slots(void);
  88 extern void add_fill_function(void *data, int (*fill)(void *));
  89 extern void step_active_slots(void);
  90 #endif
  91
  92 extern void http_init(struct remote *remote);
  93 extern void http_cleanup(void);
  94
  95 extern int data_received;
  96 extern int active_requests;
  97 extern int http_is_verbose;
  98 extern size_t http_post_buffer;
  99
 100 extern char curl_errorstr[CURL_ERROR_SIZE];
 101
 102 static inline int missing__target(int code, int result)
 103 {
 104         return  /* file:// URL -- do we ever use one??? */
 105                 (result == CURLE_FILE_COULDNT_READ_FILE) ||
 106                 /* http:// and https:// URL */
 107                 (code == 404 && result == CURLE_HTTP_RETURNED_ERROR) ||
 108                 /* ftp:// URL */
 109                 (code == 550 && result == CURLE_FTP_COULDNT_RETR_FILE)
 110                 ;
 111 }
 112
 113 #define missing_target(a) missing__target((a)->http_code, (a)->curl_result)
 114
 115 /* Helpers for modifying and creating URLs */
 116 extern void append_remote_object_url(struct strbuf *buf, const char *url,
 117                                      const char *hex,
 118                                      int only_two_digit_prefix);
 119 extern char *get_remote_object_url(const char *url, const char *hex,
 120                                    int only_two_digit_prefix);
 121
 122 /* Options for http_request_*() */
 123 #define HTTP_NO_CACHE           1
 124
 125 /* Return values for http_request_*() */
 126 #define HTTP_OK                 0
 127 #define HTTP_MISSING_TARGET     1
 128 #define HTTP_ERROR              2
 129 #define HTTP_START_FAILED       3
 130
 131 /*
 132  * Requests an url and stores the result in a strbuf.
 133  *
 134  * If the result pointer is NULL, a HTTP HEAD request is made instead of GET.
 135  */
 136 int http_get_strbuf(const char *url, struct strbuf *result, int options);
 137
 138 /*
 139  * Downloads an url and stores the result in the given file.
 140  *
 141  * If a previous interrupted download is detected (i.e. a previous temporary
 142  * file is still around) the download is resumed.
 143  */
 144 int http_get_file(const char *url, const char *filename, int options);
 145
 146 /*
 147  * Prints an error message using error() containing url and curl_errorstr,
 148  * and returns ret.
 149  */
 150 int http_error(const char *url, int ret);
 151
 152 extern int http_fetch_ref(const char *base, struct ref *ref);
 153
 154 /* Helpers for fetching packs */
 155 extern int http_get_info_packs(const char *base_url,
 156         struct packed_git **packs_head);
 157
 158 struct http_pack_request
 159 {
 160         char *url;
 161         struct packed_git *target;
 162         struct packed_git **lst;
 163         FILE *packfile;
 164         char filename[PATH_MAX];
 165         char tmpfile[PATH_MAX];
 166         struct curl_slist *range_header;
 167         struct active_request_slot *slot;
 168 };
 169
 170 extern struct http_pack_request *new_http_pack_request(
 171         struct packed_git *target, const char *base_url);
 172 extern int finish_http_pack_request(struct http_pack_request *preq);
 173 extern void release_http_pack_request(struct http_pack_request *preq);
 174
 175 /* Helpers for fetching object */
 176 struct http_object_request
 177 {
 178         char *url;
 179         char filename[PATH_MAX];
 180         char tmpfile[PATH_MAX];
 181         int localfile;
 182         CURLcode curl_result;
 183         char errorstr[CURL_ERROR_SIZE];
 184         long http_code;
 185         unsigned char sha1[20];
 186         unsigned char real_sha1[20];
 187         git_SHA_CTX c;
 188         z_stream stream;
 189         int zret;
 190         int rename;
 191         struct active_request_slot *slot;
 192 };
 193
 194 extern struct http_object_request *new_http_object_request(
 195         const char *base_url, unsigned char *sha1);
 196 extern void process_http_object_request(struct http_object_request *freq);
 197 extern int finish_http_object_request(struct http_object_request *freq);
 198 extern void abort_http_object_request(struct http_object_request *freq);
 199 extern void release_http_object_request(struct http_object_request *freq);
 200
 201 #endif /* HTTP_H */