X-Git-Url: https://git.street.me.uk/andy/viking.git/blobdiff_plain/5a37f6455110be56f334bd1e61c423f090421047..355fba114cb61cc3b9828c85f1341c46caf4a335:/src/download.c diff --git a/src/download.c b/src/download.c index 1f10ed12..dd129d2d 100644 --- a/src/download.c +++ b/src/download.c @@ -2,6 +2,7 @@ * viking -- GPS Data and Topo Analyzer, Explorer, and Manager * * Copyright (C) 2003-2005, Evan Battaglia + * Copyright (C) 2007, Guilhem Bonnefille * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by @@ -25,14 +26,24 @@ #include #include +#include #include +#ifdef HAVE_SYS_TYPES_H +#include +#endif +#ifdef HAVE_UTIME_H +#include +#endif #include #include #include + #include "download.h" #include "curl_download.h" +#include "preferences.h" +#include "globals.h" static gboolean check_file_first_line(FILE* f, gchar *patterns[]) { @@ -89,41 +100,122 @@ gboolean a_check_kml_file(FILE* f) return check_file_first_line(f, kml_str); } -static int download( const char *hostname, const char *uri, const char *fn, DownloadOptions *options, gboolean ftp) +static GList *file_list = NULL; +static GMutex *file_list_mutex = NULL; + +/* spin button scales */ +VikLayerParamScale params_scales[] = { + {1, 86400*7, 10, 0}, /* download_tile_age */ +}; + +static VikLayerParam prefs[] = { + { VIKING_PREFERENCES_NAMESPACE "download_tile_age", VIK_LAYER_PARAM_UINT, VIK_LAYER_GROUP_NONE, N_("Tile age (s):"), VIK_LAYER_WIDGET_SPINBUTTON, params_scales + 0, NULL }, +}; + +void a_download_init (void) +{ + VikLayerParamData tmp; + tmp.u = VIK_CONFIG_DEFAULT_TILE_AGE; + a_preferences_register(prefs, tmp, VIKING_PREFERENCES_GROUP_KEY); + + file_list_mutex = g_mutex_new(); +} + +static gboolean lock_file(const char *fn) +{ + gboolean locked = FALSE; + g_mutex_lock(file_list_mutex); + if (g_list_find_custom(file_list, fn, (GCompareFunc)g_strcmp0) == NULL) + { + // The filename is not yet locked + file_list = g_list_append(file_list, (gpointer)fn), + locked = TRUE; + } + g_mutex_unlock(file_list_mutex); + return locked; +} + +static void unlock_file(const char *fn) +{ + g_mutex_lock(file_list_mutex); + file_list = g_list_remove(file_list, (gconstpointer)fn); + g_mutex_unlock(file_list_mutex); +} + +static int download( const char *hostname, const char *uri, const char *fn, DownloadMapOptions *options, gboolean ftp, void *handle) { FILE *f; int ret; gchar *tmpfilename; gboolean failure = FALSE; + DownloadFileOptions file_options = {0, NULL, NULL}; /* Check file */ if ( g_file_test ( fn, G_FILE_TEST_EXISTS ) == TRUE ) { - /* File exists: return */ - return -3; + if (options == NULL || (!options->check_file_server_time && + !options->use_etag)) { + /* Nothing to do as file already exists and we don't want to check server */ + return -3; + } + + time_t tile_age = a_preferences_get(VIKING_PREFERENCES_NAMESPACE "download_tile_age")->u; + /* Get the modified time of this file */ + struct stat buf; + g_stat ( fn, &buf ); + time_t file_time = buf.st_mtime; + if ( (time(NULL) - file_time) < tile_age ) { + /* File cache is too recent, so return */ + return -3; + } + + if (options->check_file_server_time) { + file_options.time_condition = file_time; + } + if (options->use_etag) { + gchar *etag_filename = g_strdup_printf("%s.etag", fn); + gsize etag_length = 0; + g_file_get_contents (etag_filename, &(file_options.etag), &etag_length, NULL); + g_free (etag_filename); + etag_filename = NULL; + + /* check if etag is short enough */ + if (etag_length > 100) { + g_free(file_options.etag); + file_options.etag = NULL; + } + + /* TODO: should check that etag is a valid string */ + } + } else { gchar *dir = g_path_get_dirname ( fn ); g_mkdir_with_parents ( dir , 0777 ); g_free ( dir ); - - /* create placeholder file */ - if ( ! (f = g_fopen ( fn, "w+b" )) ) /* immediately open file so other threads won't -- prevents race condition */ - return -4; - fclose ( f ); - f = NULL; } tmpfilename = g_strdup_printf("%s.tmp", fn); - f = g_fopen ( tmpfilename, "w+b" ); + if (!lock_file ( tmpfilename ) ) + { + g_debug("%s: Couldn't take lock on temporary file \"%s\"\n", __FUNCTION__, tmpfilename); + g_free ( tmpfilename ); + if (options->use_etag) + g_free ( file_options.etag ); + return -4; + } + f = g_fopen ( tmpfilename, "w+b" ); /* truncate file and open it */ if ( ! f ) { + g_warning("Couldn't open temporary file \"%s\": %s", tmpfilename, g_strerror(errno)); g_free ( tmpfilename ); - g_remove ( fn ); /* couldn't create temporary. delete 0-byte file. */ + if (options->use_etag) + g_free ( file_options.etag ); return -4; } /* Call the backend function */ - ret = curl_download_get_url ( hostname, uri, f, options, ftp ); - if (ret == -1 || ret == 1 || ret == -2) { + ret = curl_download_get_url ( hostname, uri, f, options, ftp, &file_options, handle ); + + if (ret != DOWNLOAD_NO_ERROR && ret != DOWNLOAD_NO_NEWER_FILE) { g_debug("%s: download failed: curl_download_get_url=%d", __FUNCTION__, ret); failure = TRUE; } @@ -133,33 +225,72 @@ static int download( const char *hostname, const char *uri, const char *fn, Down failure = TRUE; } + fclose ( f ); + f = NULL; + if (failure) { g_warning(_("Download error: %s"), fn); - fclose ( f ); - f = NULL; g_remove ( tmpfilename ); + unlock_file ( tmpfilename ); g_free ( tmpfilename ); + if (options->use_etag) { + g_free ( file_options.etag ); + g_free ( file_options.new_etag ); + } g_remove ( fn ); /* couldn't create temporary. delete 0-byte file. */ return -1; } - fclose ( f ); - f = NULL; - g_rename ( tmpfilename, fn ); /* move completely-downloaded file to permanent location */ + if (options->use_etag) { + if (file_options.new_etag) { + /* server returned an etag value */ + gchar *etag_filename = g_strdup_printf("%s.etag", fn); + g_file_set_contents (etag_filename, file_options.new_etag, -1, NULL); + g_free (etag_filename); + etag_filename = NULL; + } + } + + if (ret == DOWNLOAD_NO_NEWER_FILE) { + g_remove ( tmpfilename ); +#if GLIB_CHECK_VERSION(2,18,0) + g_utime ( fn, NULL ); /* update mtime of local copy */ +#else + utimes ( fn, NULL ); /* update mtime of local copy */ +#endif + } else { + g_rename ( tmpfilename, fn ); /* move completely-downloaded file to permanent location */ + } + unlock_file ( tmpfilename ); g_free ( tmpfilename ); - return ret; + + if (options->use_etag) { + g_free ( file_options.etag ); + g_free ( file_options.new_etag ); + } + return 0; } /* success = 0, -1 = couldn't connect, -2 HTTP error, -3 file exists, -4 couldn't write to file... */ /* uri: like "/uri.html?whatever" */ /* only reason for the "wrapper" is so we can do redirects. */ -int a_http_download_get_url ( const char *hostname, const char *uri, const char *fn, DownloadOptions *opt ) +int a_http_download_get_url ( const char *hostname, const char *uri, const char *fn, DownloadMapOptions *opt, void *handle ) +{ + return download ( hostname, uri, fn, opt, FALSE, handle ); +} + +int a_ftp_download_get_url ( const char *hostname, const char *uri, const char *fn, DownloadMapOptions *opt, void *handle ) +{ + return download ( hostname, uri, fn, opt, TRUE, handle ); +} + +void * a_download_handle_init () { - return download ( hostname, uri, fn, opt, FALSE ); + return curl_download_handle_init (); } -int a_ftp_download_get_url ( const char *hostname, const char *uri, const char *fn, DownloadOptions *opt ) +void a_download_handle_cleanup ( void *handle ) { - return download ( hostname, uri, fn, opt, TRUE ); + curl_download_handle_cleanup ( handle ); }