vcs.maemo.org Git - monky/blob - src/ccurl_thread.c

   1 /* -*- mode: c; c-basic-offset: 4; tab-width: 4; indent-tabs-mode: t -*-
   2  * vim: ts=4 sw=4 noet ai cindent syntax=c
   3  *
   4  * Conky, a system monitor, based on torsmo
   5  *
   6  * Please see COPYING for details
   7  *
   8  * Copyright (c) 2005-2010 Brenden Matthews, Philip Kovacs, et. al.
   9  *      (see AUTHORS)
  10  * All rights reserved.
  11  *
  12  * This program is free software: you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation, either version 3 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU General Public License for more details.
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23  *
  24  */
  25
  26 #include "conky.h"
  27 #include "logging.h"
  28 #include "ccurl_thread.h"
  29 #include "text_object.h"
  30
  31 #ifdef DEBUG
  32 #include <assert.h>
  33 #endif /* DEBUG */
  34
  35 #include <curl/curl.h>
  36 #include <curl/types.h>
  37 #include <curl/easy.h>
  38
  39 /*
  40  * The following code is the conky curl thread lib, which can be re-used to
  41  * create any curl-based object (see weather and rss).  Below is an
  42  * implementation of a curl-only object ($curl) which can also be used as an
  43  * example.
  44  */
  45 typedef struct _ccurl_memory_t {
  46         char *memory;
  47         size_t size;
  48 } ccurl_memory_t;
  49
  50 /* finds a location based on uri in the list provided */
  51 ccurl_location_t *ccurl_find_location(ccurl_location_t **locations_head, char *uri)
  52 {
  53         ccurl_location_t *tail = *locations_head;
  54         ccurl_location_t *new = 0;
  55         while (tail) {
  56                 if (tail->uri &&
  57                                 strcmp(tail->uri, uri) == EQUAL) {
  58                         return tail;
  59                 }
  60                 tail = tail->next;
  61         }
  62         if (!tail) { /* new location!!!!!!! */
  63                 DBGP("new curl location: '%s'", uri);
  64                 new = malloc(sizeof(ccurl_location_t));
  65                 memset(new, 0, sizeof(ccurl_location_t));
  66                 new->uri = strndup(uri, text_buffer_size);
  67                 tail = *locations_head;
  68                 while (tail && tail->next) {
  69                         tail = tail->next;
  70                 }
  71                 if (!tail) {
  72                         /* omg the first one!!!!!!! */
  73                         *locations_head = new;
  74                 } else {
  75                         tail->next = new;
  76                 }
  77         }
  78         return new;
  79 }
  80
  81 /* iterates over the list provided, frees stuff (list item, uri, result) */
  82 void ccurl_free_locations(ccurl_location_t **locations_head)
  83 {
  84         ccurl_location_t *tail = *locations_head;
  85         ccurl_location_t *last = 0;
  86
  87         while (tail) {
  88                 if (tail->uri) free(tail->uri);
  89                 if (tail->result) free(tail->result);
  90                 last = tail;
  91                 tail = tail->next;
  92                 free(last);
  93         }
  94         *locations_head = 0;
  95 }
  96
  97 /* callback used by curl for writing the received data */
  98 size_t ccurl_write_memory_callback(void *ptr, size_t size, size_t nmemb, void *data)
  99 {
 100         size_t realsize = size * nmemb;
 101         ccurl_memory_t *mem = (ccurl_memory_t*)data;
 102
 103         mem->memory = (char *) realloc(mem->memory, mem->size + realsize + 1);
 104         if (mem->memory) {
 105                 memcpy(&(mem->memory[mem->size]), ptr, realsize);
 106                 mem->size += realsize;
 107                 mem->memory[mem->size] = 0;
 108         }
 109         return realsize;
 110 }
 111
 112
 113 /* fetch our datums */
 114 void ccurl_fetch_data(ccurl_location_t *curloc)
 115 {
 116         CURL *curl = NULL;
 117         CURLcode res;
 118
 119         // curl temps
 120         ccurl_memory_t chunk;
 121
 122         chunk.memory = NULL;
 123         chunk.size = 0;
 124
 125         curl = curl_easy_init();
 126         if (curl) {
 127                 DBGP("reading curl data from '%s'", curloc->uri);
 128                 curl_easy_setopt(curl, CURLOPT_URL, curloc->uri);
 129                 curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 1);
 130                 curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, ccurl_write_memory_callback);
 131                 curl_easy_setopt(curl, CURLOPT_WRITEDATA, (void *) &chunk);
 132                 curl_easy_setopt(curl, CURLOPT_USERAGENT, "conky-curl/1.0");
 133
 134                 res = curl_easy_perform(curl);
 135                 if (res == CURLE_OK && chunk.size) {
 136                         long http_status_code;
 137
 138                         if(curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &http_status_code) == CURLE_OK && http_status_code == 200) {
 139                                 timed_thread_lock(curloc->p_timed_thread);
 140                                 (*curloc->process_function)(curloc->result, chunk.memory);
 141                                 timed_thread_unlock(curloc->p_timed_thread);
 142                         } else {
 143                                 NORM_ERR("curl: no data from server");
 144                         }
 145                         free(chunk.memory);
 146                 } else {
 147                         NORM_ERR("curl: no data from server");
 148                 }
 149
 150                 curl_easy_cleanup(curl);
 151         }
 152 }
 153
 154 void *ccurl_thread(void *) __attribute__((noreturn));
 155
 156 void ccurl_init_thread(ccurl_location_t *curloc, int interval)
 157 {
 158 #ifdef DEBUG
 159         assert(curloc->result);
 160 #endif /* DEBUG */
 161         curloc->p_timed_thread =
 162                 timed_thread_create(&ccurl_thread,
 163                                 (void *)curloc, interval * 1000000);
 164
 165         if (!curloc->p_timed_thread) {
 166                 NORM_ERR("curl thread: error creating timed thread");
 167         }
 168         timed_thread_register(curloc->p_timed_thread,
 169                         &curloc->p_timed_thread);
 170         if (timed_thread_run(curloc->p_timed_thread)) {
 171                 NORM_ERR("curl thread: error running timed thread");
 172         }
 173 }
 174
 175 void *ccurl_thread(void *arg)
 176 {
 177         ccurl_location_t *curloc = (ccurl_location_t*)arg;
 178
 179         while (1) {
 180                 ccurl_fetch_data(curloc);
 181                 if (timed_thread_test(curloc->p_timed_thread, 0)) {
 182                         timed_thread_exit(curloc->p_timed_thread);
 183                 }
 184         }
 185         /* never reached */
 186 }
 187
 188
 189 /*
 190  * This is where the $curl section begins.
 191  */
 192
 193 struct curl_data {
 194         char uri[128];
 195         float interval;
 196 };
 197
 198 /* internal location pointer for use by $curl, no touchy */
 199 static ccurl_location_t *ccurl_locations_head = 0;
 200
 201 /* used to free data used by $curl */
 202 void ccurl_free_info(void)
 203 {
 204         ccurl_free_locations(&ccurl_locations_head);
 205 }
 206
 207 /* straight copy, used by $curl */
 208 static void ccurl_parse_data(void *result, const char *data)
 209 {
 210         strncpy(result, data, max_user_text);
 211 }
 212
 213 /* prints result data to text buffer, used by $curl */
 214 void ccurl_process_info(char *p, int p_max_size, char *uri, int interval)
 215 {
 216         ccurl_location_t *curloc = ccurl_find_location(&ccurl_locations_head, uri);
 217         if (!curloc->p_timed_thread) {
 218                 curloc->result = malloc(max_user_text);
 219                 memset(curloc->result, 0, max_user_text);
 220                 curloc->process_function = &ccurl_parse_data;
 221                 ccurl_init_thread(curloc, interval);
 222                 if (!curloc->p_timed_thread) {
 223                         NORM_ERR("error setting up curl thread");
 224                 }
 225         }
 226
 227         timed_thread_lock(curloc->p_timed_thread);
 228         strncpy(p, curloc->result, p_max_size);
 229         timed_thread_unlock(curloc->p_timed_thread);
 230 }
 231
 232 void curl_parse_arg(struct text_object *obj, const char *arg)
 233 {
 234         int argc;
 235         struct curl_data *cd;
 236         float interval = 0;
 237
 238         cd = malloc(sizeof(struct curl_data));
 239         memset(cd, 0, sizeof(struct curl_data));
 240
 241         argc = sscanf(arg, "%127s %f", cd->uri, &interval);
 242         if (argc < 1) {
 243                 free(cd);
 244                 NORM_ERR("wrong number of arguments for $curl");
 245                 return;
 246         }
 247         cd->interval = interval > 0 ? interval * 60 : 15*60;
 248         obj->data.opaque = cd;
 249 }
 250
 251 void curl_print(struct text_object *obj, char *p, int p_max_size)
 252 {
 253         struct curl_data *cd = obj->data.opaque;
 254
 255         if (!cd || !cd->uri) {
 256                 NORM_ERR("error processing Curl data");
 257                 return;
 258         }
 259         ccurl_process_info(p, p_max_size, cd->uri, cd->interval);
 260 }
 261
 262 void curl_obj_free(struct text_object *obj)
 263 {
 264         if (obj->data.opaque) {
 265                 free(obj->data.opaque);
 266                 obj->data.opaque = NULL;
 267         }
 268 }