src/lp_ws.c

   1 /*
   2     Copyright (C) 2011 jeanfi@gmail.com
   3
   4     This program is free software; you can redistribute it and/or modify
   5     it under the terms of the GNU General Public License as published by
   6     the Free Software Foundation; either version 2 of the License, or
   7     (at your option) any later version.
   8
   9     This program is distributed in the hope that it will be useful,
  10     but WITHOUT ANY WARRANTY; without even the implied warranty of
  11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12     GNU General Public License for more details.
  13
  14     You should have received a copy of the GNU General Public License
  15     along with this program; if not, write to the Free Software
  16     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  17     02110-1301 USA
  18 */
  19
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <unistd.h>
  23
  24 #include <curl/curl.h>
  25 #include <json/json.h>
  26
  27 #include "cache.h"
  28 #include "list.h"
  29 #include "lp_ws.h"
  30 #include "lp_json.h"
  31 #include "ppastats.h"
  32
  33 #define QUERY_GET_PUBLISHED_BINARIES \
  34         "?ws.op=getPublishedBinaries"
  35 #define QUERY_GET_DOWNLOAD_COUNT "?ws.op=getDownloadCount"
  36 #define QUERY_GET_DAILY_DOWNLOAD_TOTALS \
  37         "?ws.op=getDailyDownloadTotals"
  38
  39 static int DEFAULT_FETCH_RETRIES = 3;
  40
  41 static CURL *curl;
  42
  43 struct ucontent {
  44         char *data;
  45         size_t len;
  46 };
  47
  48 static size_t cbk_curl(void *buffer, size_t size, size_t nmemb, void *userp)
  49 {
  50         size_t realsize = size * nmemb;
  51         struct ucontent *mem = (struct ucontent *)userp;
  52
  53         mem->data = realloc(mem->data, mem->len + realsize + 1);
  54
  55         memcpy(&(mem->data[mem->len]), buffer, realsize);
  56         mem->len += realsize;
  57         mem->data[mem->len] = 0;
  58
  59         return realsize;
  60 }
  61
  62 static char *fetch_url(const char *url)
  63 {
  64         struct ucontent *content = malloc(sizeof(struct ucontent));
  65         char *result;
  66         long code;
  67         int retries;
  68
  69         if (debug)
  70                 printf("DEBUG: fetch_url %s\n", url);
  71
  72         if (!curl) {
  73                 if (debug)
  74                         printf("DEBUG: initializing CURL\n");
  75                 curl_global_init(CURL_GLOBAL_ALL);
  76                 curl = curl_easy_init();
  77         }
  78
  79         if (!curl)
  80                 exit(EXIT_FAILURE);
  81
  82         result = NULL;
  83
  84         retries = DEFAULT_FETCH_RETRIES;
  85
  86  retrieve:
  87         content->data = malloc(1);
  88         content->data[0] = '\0';
  89         content->len = 0;
  90
  91         curl_easy_setopt(curl, CURLOPT_URL, url);
  92         curl_easy_setopt(curl, CURLOPT_VERBOSE, 0);
  93         curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, cbk_curl);
  94         curl_easy_setopt(curl, CURLOPT_WRITEDATA, content);
  95         curl_easy_setopt(curl, CURLOPT_USERAGENT, "ppastats/0.0");
  96
  97         if (curl_easy_perform(curl) == CURLE_OK) {
  98                 curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &code);
  99
 100                 switch (code) {
 101                 case 200:
 102                         result = content->data;
 103                         break;
 104                 case 500:
 105                 case 502:
 106                 case 503:
 107                 case 504:
 108                         if (retries) {
 109                                 fprintf(stderr, "Fetch failed: %ld\n", code);
 110
 111                                 if (debug)
 112                                         printf("Wait 5s before retry.\n");
 113                                 sleep(5);
 114
 115                                 free(content->data);
 116                                 retries--;
 117                                 goto retrieve;
 118                         }
 119                 default:
 120                         fprintf(stderr, "Fetch failed: %ld\n", code);
 121                 }
 122         }
 123
 124         if (!result)
 125                 free(content->data);
 126
 127         free(content);
 128
 129         return result;
 130 }
 131
 132 static json_object *get_json_object(const char *url)
 133 {
 134         json_object *obj = NULL;
 135         char *body;
 136
 137         body = fetch_url(url);
 138
 139         if (body) {
 140                 obj = json_tokener_parse(body);
 141
 142                 free(body);
 143
 144                 return obj;
 145         }
 146
 147         return NULL;
 148 }
 149
 150 #define json_object_to_bpph_list \
 151 json_object_to_binary_package_publishing_history_list
 152
 153 struct binary_package_publishing_history * *
 154 get_binary_package_publishing_history_list(const char *archive_url,
 155                                            const char *pkg_status)
 156 {
 157         struct json_object *o_next;
 158         char *url;
 159         json_object *o;
 160         void **result = NULL;
 161
 162         url = malloc(strlen(archive_url)+
 163                      strlen(QUERY_GET_PUBLISHED_BINARIES)+
 164                      (pkg_status ? strlen("&status=")+strlen(pkg_status) : 0)+
 165                      1);
 166
 167         strcpy(url, archive_url);
 168         strcat(url, QUERY_GET_PUBLISHED_BINARIES);
 169
 170         if (pkg_status) {
 171                 strcat(url, "&status=");
 172                 strcat(url, pkg_status);
 173         }
 174
 175         while (url) {
 176                 o = get_json_object(url);
 177                 free(url);
 178                 url = NULL;
 179
 180                 if (!o)
 181                         break;
 182
 183                 result = list_append_list(result,
 184                                           (void **)json_object_to_bpph_list(o));
 185
 186                 o_next = json_object_object_get(o, "next_collection_link");
 187
 188                 if (o_next)
 189                         url = strdup(json_object_get_string(o_next));
 190
 191                 json_object_put(o);
 192         }
 193
 194         return (struct binary_package_publishing_history **)result;
 195 }
 196
 197 int get_download_count(const char *archive_url)
 198 {
 199         int n = strlen(archive_url) + strlen(QUERY_GET_DOWNLOAD_COUNT) + 1;
 200         char *url = malloc(n);
 201         int result;
 202         json_object *obj;
 203
 204         strcpy(url, archive_url);
 205         strcat(url, QUERY_GET_DOWNLOAD_COUNT);
 206
 207         obj = get_json_object(url);
 208         free(url);
 209
 210         if (!obj)
 211                 return -1;
 212
 213         result = json_object_get_int(obj);
 214
 215         json_object_put(obj);
 216
 217         return result;
 218 }
 219
 220 const struct distro_arch_series *get_distro_arch_series(const char *url)
 221 {
 222         json_object *obj;
 223         const struct distro_arch_series *distro;
 224
 225         distro = cache_get(url);
 226         if (distro)
 227                 return (struct distro_arch_series *)distro;
 228
 229         obj = get_json_object(url);
 230
 231         if (!obj)
 232                 return NULL;
 233
 234         distro = json_object_to_distro_arch_series(obj);
 235
 236         json_object_put(obj);
 237
 238         cache_put(url, distro, (void (*)(void *))&distro_arch_series_free);
 239
 240         return distro;
 241 }
 242
 243 const struct distro_series *get_distro_series(const char *url)
 244 {
 245         json_object *obj;
 246         const struct distro_series *distro;
 247
 248         distro = cache_get(url);
 249         if (distro)
 250                 return (struct distro_series *)distro;
 251
 252         obj = get_json_object(url);
 253
 254         if (!obj)
 255                 return NULL;
 256
 257         distro = json_object_to_distro_series(obj);
 258
 259         json_object_put(obj);
 260
 261         cache_put(url, distro, (void (*)(void *))&distro_series_free);
 262
 263         return distro;
 264 }
 265
 266 struct daily_download_total **get_daily_download_totals(const char *binary_url)
 267 {
 268         char *url;
 269         json_object *obj;
 270         struct daily_download_total **result = NULL;
 271
 272         url = malloc(strlen(binary_url)+
 273                      strlen(QUERY_GET_DAILY_DOWNLOAD_TOTALS)+1);
 274
 275         strcpy(url, binary_url);
 276         strcat(url, QUERY_GET_DAILY_DOWNLOAD_TOTALS);
 277
 278         obj = get_json_object(url);
 279
 280         if (obj) {
 281                 result = json_object_to_daily_download_totals(obj);
 282                 json_object_put(obj);
 283         }
 284
 285         free(url);
 286
 287         return result;
 288 }
 289
 290 void lp_ws_cleanup()
 291 {
 292         if (debug)
 293                 printf("DEBUG: cleanup CURL\n");
 294
 295         curl_easy_cleanup(curl);
 296         curl_global_cleanup();
 297 }