Pileus Git - grits/blob - src/data/gis-http.c

   1 /*
   2  * Copyright (C) 2009-2010 Andy Spencer <andy753421@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 3 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, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #include <config.h>
  19 #include <glib.h>
  20 #include <glib/gstdio.h>
  21 #include <libsoup/soup.h>
  22
  23 #include "gis-http.h"
  24
  25 GisHttp *gis_http_new(const gchar *prefix)
  26 {
  27         GisHttp *http = g_new0(GisHttp, 1);
  28         http->prefix = g_strdup(prefix);
  29         http->soup = soup_session_sync_new();
  30         g_object_set(http->soup, "user-agent", PACKAGE_STRING, NULL);
  31         return http;
  32 }
  33
  34 /* For passing data to the chunck callback */
  35 struct _cache_info {
  36         FILE  *fp;
  37         gchar *path;
  38         GisChunkCallback callback;
  39         gpointer user_data;
  40 };
  41
  42 /**
  43  * Append data to the file and call the users callback if they supplied one.
  44  */
  45 static void _chunk_cb(SoupMessage *message, SoupBuffer *chunk, gpointer _info)
  46 {
  47         struct _cache_info *info = _info;
  48
  49         if (!SOUP_STATUS_IS_SUCCESSFUL(message->status_code)) {
  50                 g_warning("GisHttp: _chunk_cb - soup failed with %d",
  51                                 message->status_code);
  52                 return;
  53         }
  54
  55         if (!fwrite(chunk->data, chunk->length, 1, info->fp))
  56                 g_error("GisHttp: _chunk_cb - Unable to write data");
  57
  58         if (info->callback) {
  59                 goffset cur = ftell(info->fp);
  60                 goffset st=0, end=0, total=0;
  61                 soup_message_headers_get_content_range(message->response_headers,
  62                                 &st, &end, &total);
  63                 info->callback(info->path, cur, total, info->user_data);
  64         }
  65 }
  66
  67 /* TODO: use .part extentions and continue even when using GIS_ONCE */
  68 gchar *gis_http_fetch(GisHttp *self, const gchar *uri, const char *local,
  69                 GisCacheType mode, GisChunkCallback callback, gpointer user_data)
  70 {
  71         g_debug("GisHttp: fetch - %s >> %s  mode=%d", uri, self->prefix, mode);
  72
  73         gchar *path = g_build_filename(g_get_user_cache_dir(), PACKAGE,
  74                         self->prefix, local, NULL);
  75
  76         /* Unlink the file if we're refreshing it */
  77         if (mode == GIS_REFRESH)
  78                 g_remove(path);
  79
  80         /* Do the cache if necessasairy */
  81         if (!(mode == GIS_ONCE && g_file_test(path, G_FILE_TEST_EXISTS)) &&
  82                         mode != GIS_LOCAL) {
  83                 g_debug("GisHttp: do_cache - Caching file %s", local);
  84
  85                 /* Open the file for writting */
  86                 FILE *fp = fopen_p(path, "a");
  87
  88                 /* Make temp data */
  89                 struct _cache_info info = {
  90                         .fp        = fp,
  91                         .path      = path,
  92                         .callback  = callback,
  93                         .user_data = user_data,
  94                 };
  95
  96                 /* Download the file */
  97                 SoupMessage *message = soup_message_new("GET", uri);
  98                 if (message == NULL)
  99                         g_error("message is null, cannot parse uri");
 100                 g_signal_connect(message, "got-chunk", G_CALLBACK(_chunk_cb), &info);
 101                 soup_message_headers_set_range(message->request_headers, ftell(fp), -1);
 102                 soup_session_send_message(self->soup, message);
 103
 104                 /* Finished */
 105                 if (message->status_code == 416) {
 106                         /* Range unsatisfiable, file already complete */
 107                 } else if (!SOUP_STATUS_IS_SUCCESSFUL(message->status_code))
 108                         g_warning("GisHttp: done_cb - error copying file, status=%d\n"
 109                                         "\tsrc=%s\n"
 110                                         "\tdst=%s",
 111                                         message->status_code, uri, path);
 112         }
 113
 114         /* TODO: free everything.. */
 115         return path;
 116 }