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  *
   3  * Conky, a system monitor, based on torsmo
   4  *
   5  * Please see COPYING for details
   6  *
   7  * Copyright (c) 2005-2009 Brenden Matthews, Philip Kovacs, et. al.
   8  *      (see AUTHORS)
   9  * All rights reserved.
  10  *
  11  * This program is free software: you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation, either version 3 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22  *
  23  * vim: ts=4 sw=4 noet ai cindent syntax=c
  24  *
  25  */
  26
  27 #include "conky.h"
  28 #include "logging.h"
  29 #include "ccurl_thread.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                         timed_thread_lock(curloc->p_timed_thread);
 137                         (*curloc->process_function)(curloc->result, chunk.memory);
 138                         timed_thread_unlock(curloc->p_timed_thread);
 139                         free(chunk.memory);
 140                 } else {
 141                         ERR("curl: no data from server");
 142                 }
 143
 144                 curl_easy_cleanup(curl);
 145         }
 146 }
 147
 148 void *ccurl_thread(void *) __attribute__((noreturn));
 149
 150 void ccurl_init_thread(ccurl_location_t *curloc, int interval)
 151 {
 152 #ifdef DEBUG
 153         assert(curloc->result);
 154 #endif /* DEBUG */
 155         curloc->p_timed_thread =
 156                 timed_thread_create(&ccurl_thread,
 157                                 (void *)curloc, interval * 1000000);
 158
 159         if (!curloc->p_timed_thread) {
 160                 ERR("curl thread: error creating timed thread");
 161         }
 162         timed_thread_register(curloc->p_timed_thread,
 163                         &curloc->p_timed_thread);
 164         if (timed_thread_run(curloc->p_timed_thread)) {
 165                 ERR("curl thread: error running timed thread");
 166         }
 167 }
 168
 169 void *ccurl_thread(void *arg)
 170 {
 171         ccurl_location_t *curloc = (ccurl_location_t*)arg;
 172
 173         while (1) {
 174                 ccurl_fetch_data(curloc);
 175                 if (timed_thread_test(curloc->p_timed_thread, 0)) {
 176                         timed_thread_exit(curloc->p_timed_thread);
 177                 }
 178         }
 179         /* never reached */
 180 }
 181
 182
 183 /*
 184  * This is where the $curl section begins.
 185  */
 186
 187 /* internal location pointer for use by $curl, no touchy */
 188 static ccurl_location_t *ccurl_locations_head = 0;
 189
 190 /* used to free data used by $curl */
 191 void ccurl_free_info(void)
 192 {
 193         ccurl_free_locations(&ccurl_locations_head);
 194 }
 195
 196 /* straight copy, used by $curl */
 197 void ccurl_parse_data(void *result, const char *data)
 198 {
 199         strncpy(result, data, max_user_text);
 200 }
 201
 202 /* prints result data to text buffer, used by $curl */
 203 void ccurl_process_info(char *p, int p_max_size, char *uri, int interval)
 204 {
 205         ccurl_location_t *curloc = ccurl_find_location(&ccurl_locations_head, uri);
 206         if (!curloc->p_timed_thread) {
 207                 curloc->result = malloc(max_user_text);
 208                 memset(curloc->result, 0, max_user_text);
 209                 curloc->process_function = &ccurl_parse_data;
 210                 ccurl_init_thread(curloc, interval);
 211                 if (!curloc->p_timed_thread) {
 212                         ERR("error setting up curl thread");
 213                 }
 214         }
 215
 216         timed_thread_lock(curloc->p_timed_thread);
 217         strncpy(p, curloc->result, p_max_size);
 218         timed_thread_unlock(curloc->p_timed_thread);
 219 }
 220