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 *self = g_new0(GisHttp, 1);
  28         self->soup = soup_session_sync_new();
  29         self->prefix = g_strdup(prefix);
  30         g_object_set(self->soup, "user-agent", PACKAGE_STRING, NULL);
  31         return self;
  32 }
  33
  34 void gis_http_free(GisHttp *self)
  35 {
  36         g_object_unref(self->soup);
  37         g_free(self->prefix);
  38         g_free(self);
  39 }
  40
  41 /* For passing data to the chunck callback */
  42 struct _cache_info {
  43         FILE  *fp;
  44         gchar *path;
  45         GisChunkCallback callback;
  46         gpointer user_data;
  47 };
  48
  49 /**
  50  * Append data to the file and call the users callback if they supplied one.
  51  */
  52 static void _chunk_cb(SoupMessage *message, SoupBuffer *chunk, gpointer _info)
  53 {
  54         struct _cache_info *info = _info;
  55
  56         if (!SOUP_STATUS_IS_SUCCESSFUL(message->status_code)) {
  57                 g_warning("GisHttp: _chunk_cb - soup failed with %d",
  58                                 message->status_code);
  59                 return;
  60         }
  61
  62         if (!fwrite(chunk->data, chunk->length, 1, info->fp))
  63                 g_error("GisHttp: _chunk_cb - Unable to write data");
  64
  65         if (info->callback) {
  66                 goffset cur = ftell(info->fp);
  67                 goffset st=0, end=0, total=0;
  68                 soup_message_headers_get_content_range(message->response_headers,
  69                                 &st, &end, &total);
  70                 info->callback(info->path, cur, total, info->user_data);
  71         }
  72 }
  73
  74 /* TODO: use .part extentions and continue even when using GIS_ONCE */
  75 gchar *gis_http_fetch(GisHttp *self, const gchar *uri, const char *local,
  76                 GisCacheType mode, GisChunkCallback callback, gpointer user_data)
  77 {
  78         g_debug("GisHttp: fetch - %s >> %s  mode=%d", uri, self->prefix, mode);
  79
  80         gchar *path = g_build_filename(g_get_user_cache_dir(), PACKAGE,
  81                         self->prefix, local, NULL);
  82
  83         /* Unlink the file if we're refreshing it */
  84         if (mode == GIS_REFRESH)
  85                 g_remove(path);
  86
  87         /* Do the cache if necessasairy */
  88         if (!(mode == GIS_ONCE && g_file_test(path, G_FILE_TEST_EXISTS)) &&
  89                         mode != GIS_LOCAL) {
  90                 g_debug("GisHttp: do_cache - Caching file %s", local);
  91
  92                 /* Open the file for writting */
  93                 FILE *fp = fopen_p(path, "a");
  94
  95                 /* Make temp data */
  96                 struct _cache_info info = {
  97                         .fp        = fp,
  98                         .path      = path,
  99                         .callback  = callback,
 100                         .user_data = user_data,
 101                 };
 102
 103                 /* Download the file */
 104                 SoupMessage *message = soup_message_new("GET", uri);
 105                 if (message == NULL)
 106                         g_error("message is null, cannot parse uri");
 107                 g_signal_connect(message, "got-chunk", G_CALLBACK(_chunk_cb), &info);
 108                 soup_message_headers_set_range(message->request_headers, ftell(fp), -1);
 109                 soup_session_send_message(self->soup, message);
 110
 111                 /* Finished */
 112                 if (message->status_code == 416) {
 113                         /* Range unsatisfiable, file already complete */
 114                 } else if (!SOUP_STATUS_IS_SUCCESSFUL(message->status_code))
 115                         g_warning("GisHttp: done_cb - error copying file, status=%d\n"
 116                                         "\tsrc=%s\n"
 117                                         "\tdst=%s",
 118                                         message->status_code, uri, path);
 119         }
 120
 121         /* TODO: free everything.. */
 122         return path;
 123 }