From 196c22ca88fbe005aba1fdf6dffe2343231757eb Mon Sep 17 00:00:00 2001 From: Max Kellermann Date: Fri, 12 Dec 2008 19:41:18 +0100 Subject: [PATCH] lyrics: use the new plugin library --- src/lyrics.c | 250 +++------------------------------------------------ src/lyrics.h | 6 +- 2 files changed, 12 insertions(+), 244 deletions(-) diff --git a/src/lyrics.c b/src/lyrics.c index f26de83..052af4e 100644 --- a/src/lyrics.c +++ b/src/lyrics.c @@ -20,251 +20,36 @@ #include "../config.h" #include -#include -#include -#include -#include -#include -#include -static GPtrArray *plugins; +static struct plugin_list plugins; struct lyrics_loader { - char *artist, *title; - - lyrics_callback_t callback; - void *callback_data; - - guint next_plugin; - - pid_t pid; - int fd; - GIOChannel *channel; - guint event_id; - - GString *data; + struct plugin_cycle *plugin; }; -static int lyrics_register_plugin(const char *path0) -{ - int ret; - struct stat st; - char *path; - - ret = stat(path0, &st); - if (ret < 0) - return -1; - - path = g_strdup(path0); - g_ptr_array_add(plugins, path); - return 0; -} - void lyrics_init(void) { - GDir *dir; - - plugins = g_ptr_array_new(); - - dir = g_dir_open(LYRICS_PLUGIN_DIR, 0, NULL); - if (dir != NULL) { - const char *name; - char path[sizeof(LYRICS_PLUGIN_DIR) + 128]; - - memcpy(path, LYRICS_PLUGIN_DIR, sizeof(LYRICS_PLUGIN_DIR) - 1); - path[sizeof(LYRICS_PLUGIN_DIR) - 1] = G_DIR_SEPARATOR; - - while ((name = g_dir_read_name(dir)) != NULL) { - g_strlcpy(path + sizeof(LYRICS_PLUGIN_DIR), name, - sizeof(path) - sizeof(LYRICS_PLUGIN_DIR)); - lyrics_register_plugin(path); - } - - g_dir_close(dir); - } + plugin_list_init(&plugins); + plugin_list_load_directory(&plugins, LYRICS_PLUGIN_DIR); } void lyrics_deinit(void) { - guint i; - - for (i = 0; i < plugins->len; ++i) - free(g_ptr_array_index(plugins, i)); - g_ptr_array_free(plugins, TRUE); -} - -static void -lyrics_next_plugin(struct lyrics_loader *loader); - -static void -lyrics_eof(struct lyrics_loader *loader) -{ - int ret, status; - - g_io_channel_unref(loader->channel); - close(loader->fd); - loader->fd = -1; - - ret = waitpid(loader->pid, &status, 0); - loader->pid = -1; - - if (ret < 0 || !WIFEXITED(status) || WEXITSTATUS(status) != 0) { - g_string_free(loader->data, TRUE); - loader->data = NULL; - - lyrics_next_plugin(loader); - } else { - loader->callback(loader->data, loader->callback_data); - } -} - -static gboolean -lyrics_data(G_GNUC_UNUSED GIOChannel *source, - G_GNUC_UNUSED GIOCondition condition, gpointer data) -{ - struct lyrics_loader *loader = data; - char buffer[256]; - ssize_t nbytes; - - assert(loader != NULL); - assert(loader->fd >= 0); - assert(loader->pid > 0); - assert(source == loader->channel); - - if ((condition & G_IO_IN) == 0) { - lyrics_eof(loader); - return FALSE; - } - - nbytes = condition & G_IO_IN - ? read(loader->fd, buffer, sizeof(buffer)) - : 0; - if (nbytes <= 0) { - lyrics_eof(loader); - return FALSE; - } - - g_string_append_len(loader->data, buffer, nbytes); - return TRUE; -} - -/** - * This is a timer callback which calls the lyrics callback "some - * timer later". This solves the problem that lyrics_load() may fail - * immediately, leaving its return value in an undefined state. - * Instead, install a timer which calls the lyrics callback in the - * moment after. - */ -static gboolean -lyrics_delayed_fail(gpointer data) -{ - struct lyrics_loader *loader = data; - - assert(loader != NULL); - assert(loader->fd < 0); - assert(loader->pid < 0); - assert(loader->data == NULL); - - loader->callback(NULL, loader->callback_data); - - return FALSE; -} - -static int -lyrics_start_plugin(struct lyrics_loader *loader, const char *plugin_path) -{ - int ret, fds[2]; - pid_t pid; - - assert(loader != NULL); - assert(loader->pid < 0); - assert(loader->fd < 0); - assert(loader->data == NULL); - - ret = pipe(fds); - if (ret < 0) - return -1; - - pid = fork(); - - if (pid < 0) { - close(fds[0]); - close(fds[1]); - return -1; - } - - if (pid == 0) { - dup2(fds[1], 1); - dup2(fds[1], 1); - close(fds[0]); - close(fds[1]); - close(0); - /* XXX close other fds? */ - - execl(plugin_path, plugin_path, - loader->artist, loader->title, NULL); - _exit(1); - } - - close(fds[1]); - - loader->pid = pid; - loader->fd = fds[0]; - loader->data = g_string_new(NULL); - - /* XXX CLOEXEC? */ - - loader->channel = g_io_channel_unix_new(loader->fd); - loader->event_id = g_io_add_watch(loader->channel, G_IO_IN|G_IO_HUP, - lyrics_data, loader); - - return 0; -} - -static void -lyrics_next_plugin(struct lyrics_loader *loader) -{ - const char *plugin_path; - int ret = -1; - - assert(loader->pid < 0); - assert(loader->fd < 0); - assert(loader->data == NULL); - - if (loader->next_plugin >= plugins->len) { - /* no plugins left */ - g_timeout_add(0, lyrics_delayed_fail, loader); - return; - } - - plugin_path = g_ptr_array_index(plugins, loader->next_plugin++); - ret = lyrics_start_plugin(loader, plugin_path); - if (ret < 0) { - /* system error */ - g_timeout_add(0, lyrics_delayed_fail, loader); - return; - } + plugin_list_deinit(&plugins); } struct lyrics_loader * lyrics_load(const char *artist, const char *title, - lyrics_callback_t callback, void *data) + plugin_callback_t callback, void *data) { struct lyrics_loader *loader = g_new(struct lyrics_loader, 1); + const char *args[3] = { artist, title, NULL }; assert(artist != NULL); assert(title != NULL); - loader->artist = g_strdup(artist); - loader->title = g_strdup(title); - loader->callback = callback; - loader->data = data; - loader->next_plugin = 0; - loader->pid = -1; - loader->fd = -1; - loader->data = NULL; - - lyrics_next_plugin(loader); + loader->plugin = plugin_run(&plugins, args, + callback, data); return loader; } @@ -272,21 +57,6 @@ lyrics_load(const char *artist, const char *title, void lyrics_free(struct lyrics_loader *loader) { - if (loader->fd >= 0) { - g_source_remove(loader->event_id); - g_io_channel_unref(loader->channel); - close(loader->fd); - } - - if (loader->pid > 0) { - int status; - - kill(loader->pid, SIGTERM); - waitpid(loader->pid, &status, 0); - } - - if (loader->data != NULL) - g_string_free(loader->data, TRUE); - + plugin_stop(loader->plugin); g_free(loader); } diff --git a/src/lyrics.h b/src/lyrics.h index 613ccb3..d8bbe73 100644 --- a/src/lyrics.h +++ b/src/lyrics.h @@ -19,9 +19,7 @@ #ifndef LYRICS_H #define LYRICS_H -#include - -typedef void (*lyrics_callback_t)(const GString *result, void *data); +#include "plugin.h" struct lyrics_loader; @@ -31,7 +29,7 @@ void lyrics_deinit(void); struct lyrics_loader * lyrics_load(const char *artist, const char *title, - lyrics_callback_t callback, void *callback_data); + plugin_callback_t callback, void *callback_data); void lyrics_free(struct lyrics_loader *loader); -- 2.30.2