+++ /dev/null
-/*
- * Copyright (C) 2006-2007 Andre Noll <maan@systemlinux.org>
- *
- * Licensed under the GPL v2. For licencing details see COPYING.
- */
-
-/** \file playlist_selector.c The playlist audio file selector of paraslash */
-
-#include <signal.h>
-#include "para.h"
-#include "error.h"
-#include "string.h"
-#include "afh.h"
-#include "afs.h"
-#include "server.h"
-#include "afs_common.h"
-#include "net.h"
-#include "ipc.h"
-#include "list.h"
-#include "user_list.h"
-#include "playlist_selector_command_list.h"
-
-/**
- * structure used for transmission of the playlist
- *
- * There's one such struct which gets initialized during startup. It lives in
- * shared memory and is used by com_lpl().
- */
-struct pls_client_data {
-/** allocated and set by com_lpl() (child) */
- int shm_id;
-/** the size of the shared memory area identified by \a shm_id */
- size_t size;
-/** initially locked, gets unlocked by parent when it is done */
- int mutex;
-/** return value, set by parent */
- int retval;
-};
-
-/** data specific to the playlist selector */
-struct private_pls_data {
-/** guards against concurrent client access */
- int client_mutex;
-/** guards against concurrent parent-child access */
- int server_mutex;
-/** pointer to the client data */
- struct pls_client_data *client_data;
-/** id of the shm corresponding to \a client_data */
- int client_data_shm_id;
-};
-
-/** we refuse to load playlists bigger than that */
-#define MAX_PLAYLIST_BYTES (1024 * 1024)
-
-static unsigned playlist_len, playlist_size, current_playlist_entry;
-static char **playlist;
-static struct audio_file_selector *self;
-
-extern struct misc_meta_data *mmd;
-
-static int playlist_add(char *path, __a_unused void *data)
-{
- if (playlist_len >= playlist_size) {
- playlist_size = 2 * playlist_size + 1;
- playlist = para_realloc(playlist, playlist_size * sizeof(char *));
- }
- PARA_DEBUG_LOG("adding #%d/%d: %s\n", playlist_len, playlist_size, path);
- playlist[playlist_len++] = para_strdup(path);
- return 1;
-}
-
-static int send_playlist_to_server(const char *buf, size_t size)
-{
- struct private_pls_data *ppd = self->private_data;
- int ret, shm_mutex = -1, shm_id = -1;
- void *shm = NULL;
-
- PARA_DEBUG_LOG("new playlist (%zd bytes)\n", size);
-
- ret = mutex_new();
- if (ret < 0)
- return ret;
- shm_mutex = ret;
-
- ret = shm_new(size);
- if (ret < 0)
- goto out;
- shm_id = ret;
-
- ret = shm_attach(shm_id, ATTACH_RW, &shm);
- if (ret < 0)
- goto out;
- mutex_lock(shm_mutex);
- memcpy(shm, buf, size);
- mutex_lock(ppd->client_mutex);
- mutex_lock(ppd->server_mutex);
- ppd->client_data->size = size;
- ppd->client_data->shm_id = shm_id;
- ppd->client_data->mutex = shm_mutex;
- kill(getppid(), SIGUSR1); /* wake up the server */
- mutex_unlock(ppd->server_mutex);
- mutex_lock(shm_mutex); /* wait until server is done */
- mutex_unlock(shm_mutex);
- ret = ppd->client_data->retval;
- mutex_unlock(ppd->client_mutex);
- shm_detach(shm);
-out:
- if (shm_id >= 0)
- shm_destroy(shm_id);
- mutex_destroy(shm_mutex);
- PARA_DEBUG_LOG("returning %d\n", ret);
- return ret;
-}
-
-int com_lpl(int fd, __a_unused int argc, __a_unused char * const * const argv)
-{
- unsigned loaded = 0;
- size_t bufsize = 4096; /* guess that's enough */
- char *buf = para_malloc(bufsize);
- ssize_t ret;
- ret = send_buffer(fd, AWAITING_DATA_MSG);
- if (ret < 0)
- goto out;
-again:
- ret = recv_bin_buffer(fd, buf + loaded, bufsize - loaded);
- if (ret < 0)
- goto out;
- if (!ret) {
- ret = send_playlist_to_server(buf, loaded);
- goto out;
- }
- loaded += ret;
- ret = -E_LOAD_PLAYLIST;
- if (loaded >= MAX_PLAYLIST_BYTES)
- goto out;
- if (loaded >= bufsize) {
- bufsize *= 2;
- buf = para_realloc(buf, bufsize);
- }
- goto again;
-out:
- free(buf);
- return ret;
-}
-
-int com_ppl(int fd, __a_unused int argc, __a_unused char * const * const argv)
-{
- unsigned i;
-
- PARA_DEBUG_LOG("sending playlist to client (%d entries)\n", playlist_len);
- for (i = 0; i < playlist_len; i++) {
- int ret = send_va_buffer(fd, "%s\n", playlist[
- (i + current_playlist_entry) % playlist_len]);
- if (ret < 0)
- return ret;
- }
- return 1;
-}
-
-static char **pls_get_audio_file_list(unsigned int num)
-{
- char **file_list;
- unsigned i;
-
- num = PARA_MIN(num, playlist_len);
- if (!num)
- return NULL;
- file_list = para_malloc((num + 1) * sizeof(char *));
- for (i = 0; i < num; i++) {
- unsigned j = (current_playlist_entry + i + 1) % playlist_len;
- file_list[i] = para_strdup(playlist[j]);
- }
- file_list[i] = NULL;
- return file_list;
-}
-
-static void free_playlist_contents(void)
-{
- int i;
-
- PARA_DEBUG_LOG("freeing playlist (%d entries)\n", playlist_len);
- for (i = 0; i < playlist_len; i++)
- free(playlist[i]);
- current_playlist_entry = 0;
- playlist_len = 0;
-}
-
-static void pls_shutdown(void)
-{
- struct private_pls_data *ppd = self->private_data;
-
- shm_detach(ppd->client_data);
- shm_destroy(ppd->client_data_shm_id);
- mutex_destroy(ppd->server_mutex);
- mutex_destroy(ppd->client_mutex);
- free(ppd);
- free_playlist_contents();
- free(playlist);
- playlist = NULL;
- playlist_len = 0;
- playlist_size = 0;
-}
-
-static void pls_post_select(__a_unused fd_set *rfds, __a_unused fd_set *wfds)
-{
- struct private_pls_data *ppd = self->private_data;
- struct pls_client_data *pcd = ppd->client_data;
- int ret;
- void *shm;
-
- mutex_lock(ppd->server_mutex);
- if (!pcd->size)
- goto out;
- free_playlist_contents();
- ret = shm_attach(pcd->shm_id, ATTACH_RW, &shm);
- if (ret < 0) {
- PARA_ERROR_LOG("%s\n", PARA_STRERROR(-ret));
- goto out;
- }
- PARA_DEBUG_LOG("loading new playlist (%zd bytes)\n", pcd->size);
- ret = for_each_line((char *)shm, pcd->size, &playlist_add, NULL);
- shm_detach(shm);
- PARA_NOTICE_LOG("new playlist (%d entries)\n", playlist_len);
- sprintf(mmd->selector_info, "dbinfo1:new playlist: %d files\n"
- "dbinfo2:\ndbinfo3:\n", playlist_len);
- pcd->retval = 1;
- pcd->size = 0;
- mutex_unlock(pcd->mutex);
-out:
- mutex_unlock(ppd->server_mutex);
-}
-
-static size_t string_offset(const char *str, size_t max)
-{
- size_t l = strlen(str);
-
- if (l <= max)
- return 0;
- return l - max;
-}
-
-static void pls_update_audio_file(char *audio_file)
-{
- unsigned i;
- char *dir = para_dirname(audio_file),
- *prev = playlist[current_playlist_entry % playlist_len];
- size_t dir_off = string_offset(dir, 50),
- prev_off = string_offset(prev, 70);
-
- for (i = 1; i <= playlist_len; i++) {
- char *next;
- size_t next_off;
- unsigned j = (current_playlist_entry + i) % playlist_len;
- if (strcmp(playlist[j], audio_file))
- continue;
- current_playlist_entry = j;
- next = playlist[(j + 1) %playlist_len];
- next_off = string_offset(next, 70);
- snprintf(mmd->selector_info, MMD_INFO_SIZE,
- "dbinfo1: %d files, current dir: %s%s\n"
- "dbinfo2: prev: %s%s\n"
- "dbinfo3: next: %s%s\n",
- playlist_len,
- dir_off? "... " : "", dir + dir_off,
- prev_off? "... " : "", prev + prev_off,
- next_off? "... " : "", next + next_off
- );
- break;
- }
- free(dir);
-}
-
-/**
- * the init function for the playlist selector
- *
- * \param afs pointer to the struct to initialize
- *
- * Init all function pointers of \a afs
- *
- * \sa struct audio_file_selector, misc_meta_data::selector_info, mysql.c
- * random_selector.c.
- */
-int playlist_selector_init(struct audio_file_selector *afs)
-{
- int ret;
- struct private_pls_data *ppd = NULL;
- void *shm = NULL;
-
- self = afs;
- afs->cmd_list = playlist_selector_cmds;
- afs->get_audio_file_list = pls_get_audio_file_list;
- afs->shutdown = pls_shutdown;
- afs->post_select = pls_post_select;
- afs->update_audio_file = pls_update_audio_file;
- ppd = para_calloc(sizeof(struct private_pls_data));
- afs->private_data = ppd;
-
- ppd->client_mutex = -1;
- ppd->server_mutex = -1;
- ppd->client_data_shm_id = -1;
- ppd->client_data = NULL;
-
- ret = mutex_new();
- if (ret < 0)
- goto err_out;
- ppd->client_mutex = ret;
-
- ret = mutex_new();
- if (ret < 0)
- goto err_out;
- ppd->server_mutex = ret;
-
- ret = shm_new(sizeof(struct pls_client_data));
- if (ret < 0)
- goto err_out;
- ppd->client_data_shm_id = ret;
-
- ret = shm_attach(ppd->client_data_shm_id, ATTACH_RW, &shm);
- if (ret < 0)
- goto err_out;
- ppd->client_data = shm;
- ppd->client_data->size = 0;
- sprintf(mmd->selector_info, "dbinfo1: Welcome to the playlist "
- "selector\ndbinfo2: no playlist loaded\ndbinfo3:\n");
- return 1;
-err_out:
- if (ppd->client_data_shm_id >= 0)
- shm_destroy(ppd->client_data_shm_id);
- if (ppd->client_mutex >= 0)
- mutex_destroy(ppd->client_mutex);
- if (ppd->server_mutex >= 0)
- mutex_destroy(ppd->server_mutex);
- free(ppd);
- return ret;
-}
projects / paraslash.git / blobdiff