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func_channel: Add CHANNEL_EXISTS function. 

Adds a function to check for the existence of a channel by
name or by UNIQUEID.

ASTERISK-29656 #close

Change-Id: Ib464e9eb6e13dc683a846286798fecff4fd943cb
This commit is contained in:
Naveen Albert 2021-09-15 18:21:13 +00:00 committed by N A
parent cfd0246d11
commit cf0d656ae6
2 changed files with 42 additions and 0 deletions
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4
doc/CHANGES-staging/func_channel.txt Normal file
View File

@ -0,0 +1,4 @@
Subject: func_channel
Adds the CHANNEL_EXISTS function to check for the existence
of a channel by name or unique ID.

38
funcs/func_channel.c
View File

@ -20,6 +20,7 @@
*
* \author Kevin P. Fleming <kpfleming@digium.com>
* \author Ben Winslow
* \author Naveen Albert <asterisk@phreaknet.org>
*
* \ingroup functions
*/
@ -62,6 +63,19 @@
will be space-delimited.</para>
</description>
</function>
<function name="CHANNEL_EXISTS" language="en_US">
<synopsis>
Checks if the specified channel exists.
</synopsis>
<syntax>
<parameter name="name_or_uid" required="true">
<para>The name or unique ID of the channel to check.</para>
</parameter>
</syntax>
<description>
<para>Returns 1 if the channel <replaceable>name_or_uid</replaceable> exists, 0 if not.</para>
</description>
</function>
<function name="MASTER_CHANNEL" language="en_US">
<synopsis>
Gets or sets variables on the master channel
@ -711,6 +725,28 @@ static struct ast_custom_function channels_function = {
.read = func_channels_read,
};
static int func_chan_exists_read(struct ast_channel *chan, const char *function, char *data, char *buf, size_t maxlen)
{
struct ast_channel *chan_found = NULL;
if (ast_strlen_zero(data)) {
ast_log(LOG_WARNING, "%s: Channel name or unique ID required\n", function);
return -1;
}
chan_found = ast_channel_get_by_name(data);
snprintf(buf, maxlen, "%d", (chan_found ? 1 : 0));
if (chan_found) {
ast_channel_unref(chan_found);
}
return 0;
}
static struct ast_custom_function chan_exists_function = {
.name = "CHANNEL_EXISTS",
.read = func_chan_exists_read,
};
static int func_mchan_read(struct ast_channel *chan, const char *function,
char *data, struct ast_str **buf, ssize_t len)
{
@ -761,6 +797,7 @@ static int unload_module(void)
res |= ast_custom_function_unregister(&channel_function);
res |= ast_custom_function_unregister(&channels_function);
res |= ast_custom_function_unregister(&chan_exists_function);
res |= ast_custom_function_unregister(&mchan_function);
return res;
@ -772,6 +809,7 @@ static int load_module(void)
res |= ast_custom_function_register(&channel_function);
res |= ast_custom_function_register(&channels_function);
res |= ast_custom_function_register(&chan_exists_function);
res |= ast_custom_function_register(&mchan_function);
return res;