/*
- * Copyright (C) 2005-2007 Andre Noll <maan@systemlinux.org>
+ * Copyright (C) 2005-2009 Andre Noll <maan@systemlinux.org>
*
- * 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
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
+ * Licensed under the GPL v2. For licencing details see COPYING.
*/
/**
- * \file stat.c functions used for sending/receiving the status of para_server
- * and para_audiod
+ * \file stat.c Functions used for sending/receiving the status of para_server
+ * and para_audiod.
*/
+
+#include <regex.h>
+
#include "para.h"
-#include "close_on_fork.h"
-#include "list.h"
#include "error.h"
#include "string.h"
-#include "fd.h"
-
-/** the maximal number of simultaneous connections */
-#define MAX_STAT_CLIENTS 50
-
-/**
- * describes a status client of para_audiod
- *
- * There's one such structure per audiod client that sent the 'stat' command.
- *
- * A status client is identified by its file descriptor. para_audiod
- * keeps a list of connected status clients.
- */
-struct stat_client {
- /** the stat client's file descriptor */
- int fd;
- /** bitmask of those status items the client is interested in */
- long unsigned item_mask;
- /** its entry in the list of stat clients */
- struct list_head node;
-};
-
-static struct list_head client_list;
-static int initialized;
-static int num_clients;
-
-/**
- * the list of all status items sent by para_server/para_audiod
- */
-const char *status_item_list[NUM_STAT_ITEMS] = {
- [SI_STATUS_BAR] = "status_bar",
- [SI_STATUS] = "status",
- [SI_NUM_PLAYED] = "num_played",
-
- [SI_MTIME] = "mtime",
- [SI_LENGTH_MIN] = "length_min",
- [SI_LENGTH_SEC] = "length_sec",
-
- [SI_FILE_SIZE] = "file_size",
- [SI_STATUS_FLAGS] = "status_flags",
- [SI_FORMAT] = "format",
-
- [SI_SCORE] = "score",
- [SI_AUDIO_INFO1] = "audio_file_info1",
- [SI_AUDIO_INFO2] = "audio_file_info2",
- [SI_AUDIO_INFO3] = "audio_file_info3",
- [SI_DBINFO1] = "dbinfo1",
- [SI_DBINFO2] = "dbinfo2",
- [SI_DBINFO3] = "dbinfo3",
- [SI_DECODER_FLAGS] = "decoder_flags",
- [SI_AUDIOD_STATUS] = "audiod_status",
+/** The minimal length of a status item buffer. */
+#define MIN_STAT_ITEM_LEN 9 /* 5 + 2 + 2, e.g. '0005 00:\n' */
- [SI_PLAY_TIME] = "play_time",
- [SI_UPTIME] = "uptime",
- [SI_OFFSET] = "offset",
-
- [SI_LENGTH] = "length",
- [SI_STREAM_START] = "stream_start",
- [SI_CURRENT_TIME] = "current_time",
-
- [SI_AUDIOD_UPTIME] = "audiod_uptime",
- [SI_SELECTOR] = "dbtool"
-};
-
-static void dump_stat_client_list(void)
-{
- struct stat_client *sc;
-
- if (!initialized)
- return;
- list_for_each_entry(sc, &client_list, node)
- PARA_INFO_LOG("stat client on fd %d\n", sc->fd);
-}
/**
- * add a status client to the list
+ * Call a function for each complete status item of a buffer.
*
- * \param fd the file descriptor of the client
- * \param mask bitfield of status items for this client
+ * \param item_buf The source buffer.
+ * \param num_bytes The length of \a buf.
+ * \param item_handler Function to call for each complete item.
*
- * Only those status items having the bit set in \a mask will be
- * sent to the client.
+ * \return Negative on errors, the number of bytes _not_ passed to \a
+ * item_handler on success.
*
- * \return Positive value on success, or -E_TOO_MANY_CLIENTS if
- * the number of connected clients exceeds #MAX_STAT_CLIENTS.
+ * Status items are expected in the format used by parser-friendly output mode
+ * of the stat command of para_client/para_audioc.
*/
-int stat_client_add(int fd, long unsigned mask)
+int for_each_stat_item(char *item_buf, size_t num_bytes,
+ int (*item_handler)(int, char *))
{
- struct stat_client *new_client;
+ char *buf = item_buf;
+ int len = num_bytes;
- if (num_clients >= MAX_STAT_CLIENTS) {
- PARA_ERROR_LOG("maximal number of stat clients (%d) exceeded\n",
- MAX_STAT_CLIENTS);
- return -E_TOO_MANY_CLIENTS;
- }
- if (!initialized) {
- INIT_LIST_HEAD(&client_list);
- initialized = 1;
- }
- PARA_INFO_LOG("adding client on fd %d\n", fd);
- new_client = para_malloc(sizeof(struct stat_client));
- new_client->fd = fd;
- new_client->item_mask = mask;
- para_list_add(&new_client->node, &client_list);
- dump_stat_client_list();
- num_clients++;
- return 1;
-}
-/**
- * write a message to all connected status clients
- *
- * \param msg a \p NULL terminated buffer
- * \param itemnum The number of the status item of \a msg
- *
- * On write errors, remove the status client from the client list and close its
- * file descriptor.
- */
-void stat_client_write(const char *msg, int itemnum)
-{
- struct stat_client *sc, *tmp;
- size_t len = strlen(msg);
- struct timeval tv = {0 , 0};
-
- if (!initialized || !len)
- return;
- list_for_each_entry_safe(sc, tmp, &client_list, node) {
- int fd = sc->fd, ret;
- fd_set wfds;
-
- if (!((1 << itemnum) & sc->item_mask))
- continue;
- FD_ZERO(&wfds);
- FD_SET(fd, &wfds);
-// PARA_DEBUG_LOG("%s: p=%lx\n", __func__, (long)p);
- ret = para_select(fd + 1, NULL, &wfds, &tv);
- if (ret > 0) {
- ret = write(fd, msg, len);
- PARA_DEBUG_LOG("dumped %s to fd %d, ret = %d\n", msg, fd, ret);
- if (ret == len )
+ for (;;) {
+ int i, ret, item_len, item_num = 0;
+ if (len < MIN_STAT_ITEM_LEN)
+ break;
+ ret = read_size_header(buf);
+ if (ret < 0)
+ return ret;
+ item_len = ret;
+ if (item_len > len - 5) /* item not complete */
+ break;
+ for (i = 0; i < 2; i++) {
+ unsigned char c = buf[5 + i];
+ item_num <<= 4;
+ if (c >= '0' && c <= '9') {
+ item_num += c - '0';
+ continue;
+ }
+ if (c >= 'a' && c <= 'f') {
+ item_num += c - 'a' + 10;
continue;
+ }
+ return -E_STAT_ITEM_PARSE;
}
- /* write error or fd not ready for writing */
- close(fd);
- num_clients--;
- PARA_INFO_LOG("deleting client on fd %d\n", fd);
- list_del(&sc->node);
- free(sc);
- dump_stat_client_list();
- }
- PARA_DEBUG_LOG("%d client(s)\n", num_clients);
-}
-
-
-/**
- * check if string is a known status item.
- *
- * \param item buffer containing the text to check
- *
- * \return If \a item is a valid status item, the number of that status item is
- * returned. Otherwise, this function returns \p -E_UNKNOWN_STAT_ITEM.
- */
-int stat_item_valid(const char *item)
-{
- int i;
- if (!item || !*item) {
- PARA_ERROR_LOG("%s\n", "no item");
- return -E_UNKNOWN_STAT_ITEM;
- }
- FOR_EACH_STAT_ITEM(i)
- if (!strcmp(status_item_list[i], item))
- return i;
- return -E_UNKNOWN_STAT_ITEM;
-}
-
-/**
- * check if line starts with known status item.
- *
- * \param line buffer containing the line
- *
- * \return If the beginning of \a line matches any paraslash status item and is
- * followed by a colon, the number of that status item is returned. Otherwise,
- * this function returns \p -E_UNKNOWN_STAT_ITEM.
- */
-int stat_line_valid(const char *line)
-{
- int i;
- size_t line_len;
-
- if (!line || !*line)
- return -E_UNKNOWN_STAT_ITEM;
- line_len = strlen(line);
- FOR_EACH_STAT_ITEM(i) {
- const char *s = status_item_list[i];
- size_t item_len = strlen(s);
-
- if (line_len > item_len && line[item_len] == ':' &&
- !strncmp(line, s, item_len))
- return i;
- }
- return -E_UNKNOWN_STAT_ITEM;
-}
-
-/**
- * call a custom function for each complete line
- *
- * \param buf the buffer containing data seperated by newlines
- * \param n the number of bytes in \a buf
- * \param line_handler the custom function
- *
- * If \a line_handler is \p NULL, return number of complete lines in buf.
- * Otherwise, call \a line_handler for each complete line. The rest of the
- * buffer (last chunk containing incomplete line is moved to the beginning of
- * the buffer.
- *
- * \return If line_handler is not NULL, this function returns the number
- * of bytes not handled to \a line_handler.
- */
-size_t for_each_line(char *buf, size_t n, void (*line_handler)(char *))
-{
- char *start = buf, *end;
- size_t num_lines = 0, bytes_left = n;
-
-// PARA_INFO_LOG("buf: %s", buf);
- while (bytes_left) {
- char *next_null;
- char *next_cr;
-
- next_cr = memchr(start, '\n', bytes_left);
- next_null = memchr(start, '\0', bytes_left);
- if (!next_cr && !next_null)
- break;
- if (next_cr && next_null) {
- end = next_cr < next_null? next_cr : next_null;
- } else if (next_null) {
- end = next_null;
- } else
- end = next_cr;
- num_lines++;
- if (line_handler) {
- *end = '\0';
-// PARA_INFO_LOG("calling line handler: %s\n", start);
- line_handler(start);
+ if (buf[7] != ':' || buf[5 + item_len - 1] != '\n')
+ return -E_STAT_ITEM_PARSE;
+ buf[5 + item_len - 1] = '\0';
+ if (item_num >= NUM_STAT_ITEMS)
+ PARA_WARNING_LOG("unknown status item %d: %s\n",
+ item_num, buf + 8);
+ else {
+ ret = item_handler(item_num, buf + 8);
+ if (ret < 0)
+ return ret;
}
- start = ++end;
- bytes_left = buf + n - start;
+ buf += 5 + item_len;
+ len -= 5 + item_len;
+ assert(len >= 0 && buf <= item_buf + num_bytes);
}
- if (!line_handler)
- return num_lines;
- if (bytes_left && bytes_left != n)
- memmove(buf, start, bytes_left);
- return bytes_left;
+ assert(len >= 0);
+ if (len && len != num_bytes)
+ memmove(item_buf, item_buf + num_bytes - len, len);
+ return len;
}
-
projects / paraslash.git / blobdiff