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
  11 /*
  12  * We detect based on the cURL version if multi-transfer is
  13  * usable in this implementation and define this symbol accordingly.
  14  * This is not something Makefile should set nor users should pass
  15  * via CFLAGS.
  16  */
  17 #undef USE_CURL_MULTI
  18
  19 #if LIBCURL_VERSION_NUM >= 0x071000
  20 #define USE_CURL_MULTI
  21 #define DEFAULT_MAX_REQUESTS 5
  22 #endif
  23
  24 #if LIBCURL_VERSION_NUM < 0x070704
  25 #define curl_global_cleanup() do { /* nothing */ } while(0)
  26 #endif
  27 #if LIBCURL_VERSION_NUM < 0x070800
  28 #define curl_global_init(a) do { /* nothing */ } while(0)
  29 #endif
  30
  31 #if (LIBCURL_VERSION_NUM < 0x070c04) || (LIBCURL_VERSION_NUM == 0x071000)
  32 #define NO_CURL_EASY_DUPHANDLE
  33 #endif
  34
  35 #if LIBCURL_VERSION_NUM < 0x070a03
  36 #define CURLE_HTTP_RETURNED_ERROR CURLE_HTTP_NOT_FOUND
  37 #endif
  38
  39 struct slot_results
  40 {
  41         CURLcode curl_result;
  42         long http_code;
  43 };
  44
  45 struct active_request_slot
  46 {
  47         CURL *curl;
  48         FILE *local;
  49         int in_use;
  50         CURLcode curl_result;
  51         long http_code;
  52         int *finished;
  53         struct slot_results *results;
  54         void *callback_data;
  55         void (*callback_func)(void *data);
  56         struct active_request_slot *next;
  57 };
  58
  59 struct buffer
  60 {
  61         struct strbuf buf;
  62         size_t posn;
  63 };
  64
  65 /* Curl request read/write callbacks */
  66 extern size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb,
  67                            struct buffer *buffer);
  68 extern size_t fwrite_buffer(const void *ptr, size_t eltsize,
  69                             size_t nmemb, struct strbuf *buffer);
  70 extern size_t fwrite_null(const void *ptr, size_t eltsize,
  71                           size_t nmemb, struct strbuf *buffer);
  72
  73 /* Slot lifecycle functions */
  74 extern struct active_request_slot *get_active_slot(void);
  75 extern int start_active_slot(struct active_request_slot *slot);
  76 extern void run_active_slot(struct active_request_slot *slot);
  77 extern void finish_all_active_slots(void);
  78 extern void release_active_slot(struct active_request_slot *slot);
  79
  80 #ifdef USE_CURL_MULTI
  81 extern void fill_active_slots(void);
  82 extern void add_fill_function(void *data, int (*fill)(void *));
  83 extern void step_active_slots(void);
  84 #endif
  85
  86 extern void http_init(void);
  87 extern void http_cleanup(void);
  88
  89 extern int data_received;
  90 extern int active_requests;
  91
  92 extern char curl_errorstr[CURL_ERROR_SIZE];
  93
  94 static inline int missing__target(int code, int result)
  95 {
  96         return  /* file:// URL -- do we ever use one??? */
  97                 (result == CURLE_FILE_COULDNT_READ_FILE) ||
  98                 /* http:// and https:// URL */
  99                 (code == 404 && result == CURLE_HTTP_RETURNED_ERROR) ||
 100                 /* ftp:// URL */
 101                 (code == 550 && result == CURLE_FTP_COULDNT_RETR_FILE)
 102                 ;
 103 }
 104
 105 #define missing_target(a) missing__target((a)->http_code, (a)->curl_result)
 106
 107 extern int http_fetch_ref(const char *base, const char *ref, unsigned char *sha1);
 108
 109 #endif /* HTTP_H */