Andrew's git / gitweb.git / http.h
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http.hon commit pickaxe: hoist empty needle check (8fa4b09)
   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#include "url.h"
  12
  13/*
  14 * We detect based on the cURL version if multi-transfer is
  15 * usable in this implementation and define this symbol accordingly.
  16 * This is not something Makefile should set nor users should pass
  17 * via CFLAGS.
  18 */
  19#undef USE_CURL_MULTI
  20
  21#if LIBCURL_VERSION_NUM >= 0x071000
  22#define USE_CURL_MULTI
  23#define DEFAULT_MAX_REQUESTS 5
  24#endif
  25
  26#if LIBCURL_VERSION_NUM < 0x070704
  27#define curl_global_cleanup() do { /* nothing */ } while (0)
  28#endif
  29#if LIBCURL_VERSION_NUM < 0x070800
  30#define curl_global_init(a) do { /* nothing */ } while (0)
  31#endif
  32
  33#if (LIBCURL_VERSION_NUM < 0x070c04) || (LIBCURL_VERSION_NUM == 0x071000)
  34#define NO_CURL_EASY_DUPHANDLE
  35#endif
  36
  37#if LIBCURL_VERSION_NUM < 0x070a03
  38#define CURLE_HTTP_RETURNED_ERROR CURLE_HTTP_NOT_FOUND
  39#endif
  40
  41#if LIBCURL_VERSION_NUM < 0x070c03
  42#define NO_CURL_IOCTL
  43#endif
  44
  45struct slot_results {
  46        CURLcode curl_result;
  47        long http_code;
  48};
  49
  50struct active_request_slot {
  51        CURL *curl;
  52        int in_use;
  53        CURLcode curl_result;
  54        long http_code;
  55        int *finished;
  56        struct slot_results *results;
  57        void *callback_data;
  58        void (*callback_func)(void *data);
  59        struct active_request_slot *next;
  60};
  61
  62struct buffer {
  63        struct strbuf buf;
  64        size_t posn;
  65};
  66
  67/* Curl request read/write callbacks */
  68extern size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *strbuf);
  69extern size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *strbuf);
  70extern size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf);
  71#ifndef NO_CURL_IOCTL
  72extern curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp);
  73#endif
  74
  75/* Slot lifecycle functions */
  76extern struct active_request_slot *get_active_slot(void);
  77extern int start_active_slot(struct active_request_slot *slot);
  78extern void run_active_slot(struct active_request_slot *slot);
  79extern void finish_active_slot(struct active_request_slot *slot);
  80extern void finish_all_active_slots(void);
  81extern int handle_curl_result(struct active_request_slot *slot,
  82                              struct slot_results *results);
  83
  84#ifdef USE_CURL_MULTI
  85extern void fill_active_slots(void);
  86extern void add_fill_function(void *data, int (*fill)(void *));
  87extern void step_active_slots(void);
  88#endif
  89
  90extern void http_init(struct remote *remote, const char *url,
  91                      int proactive_auth);
  92extern void http_cleanup(void);
  93
  94extern int active_requests;
  95extern int http_is_verbose;
  96extern size_t http_post_buffer;
  97
  98extern char curl_errorstr[CURL_ERROR_SIZE];
  99
 100static inline int missing__target(int code, int result)
 101{
 102        return  /* file:// URL -- do we ever use one??? */
 103                (result == CURLE_FILE_COULDNT_READ_FILE) ||
 104                /* http:// and https:// URL */
 105                (code == 404 && result == CURLE_HTTP_RETURNED_ERROR) ||
 106                /* ftp:// URL */
 107                (code == 550 && result == CURLE_FTP_COULDNT_RETR_FILE)
 108                ;
 109}
 110
 111#define missing_target(a) missing__target((a)->http_code, (a)->curl_result)
 112
 113/* Helpers for modifying and creating URLs */
 114extern void append_remote_object_url(struct strbuf *buf, const char *url,
 115                                     const char *hex,
 116                                     int only_two_digit_prefix);
 117extern char *get_remote_object_url(const char *url, const char *hex,
 118                                   int only_two_digit_prefix);
 119
 120/* Options for http_request_*() */
 121#define HTTP_NO_CACHE           1
 122
 123/* Return values for http_request_*() */
 124#define HTTP_OK                 0
 125#define HTTP_MISSING_TARGET     1
 126#define HTTP_ERROR              2
 127#define HTTP_START_FAILED       3
 128#define HTTP_REAUTH     4
 129#define HTTP_NOAUTH     5
 130
 131/*
 132 * Requests a 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 */
 136int http_get_strbuf(const char *url, struct strbuf *result, int options);
 137
 138/*
 139 * Prints an error message using error() containing url and curl_errorstr,
 140 * and returns ret.
 141 */
 142int http_error(const char *url, int ret);
 143
 144extern int http_fetch_ref(const char *base, struct ref *ref);
 145
 146/* Helpers for fetching packs */
 147extern int http_get_info_packs(const char *base_url,
 148        struct packed_git **packs_head);
 149
 150struct http_pack_request {
 151        char *url;
 152        struct packed_git *target;
 153        struct packed_git **lst;
 154        FILE *packfile;
 155        char tmpfile[PATH_MAX];
 156        struct curl_slist *range_header;
 157        struct active_request_slot *slot;
 158};
 159
 160extern struct http_pack_request *new_http_pack_request(
 161        struct packed_git *target, const char *base_url);
 162extern int finish_http_pack_request(struct http_pack_request *preq);
 163extern void release_http_pack_request(struct http_pack_request *preq);
 164
 165/* Helpers for fetching object */
 166struct http_object_request {
 167        char *url;
 168        char tmpfile[PATH_MAX];
 169        int localfile;
 170        CURLcode curl_result;
 171        char errorstr[CURL_ERROR_SIZE];
 172        long http_code;
 173        unsigned char sha1[20];
 174        unsigned char real_sha1[20];
 175        git_SHA_CTX c;
 176        git_zstream stream;
 177        int zret;
 178        int rename;
 179        struct active_request_slot *slot;
 180};
 181
 182extern struct http_object_request *new_http_object_request(
 183        const char *base_url, unsigned char *sha1);
 184extern void process_http_object_request(struct http_object_request *freq);
 185extern int finish_http_object_request(struct http_object_request *freq);
 186extern void abort_http_object_request(struct http_object_request *freq);
 187extern void release_http_object_request(struct http_object_request *freq);
 188
 189#endif /* HTTP_H */