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<!-- Module User's Guide -->

<chapter>
	
	<title>&adminguide;</title>
	
	<section>
	<title>Overview</title>
	<para>
		This module provides an HTTP transport layer implementation for
		the RPC management interface in a human-readable format.
	<para>
	</para>
		The xHTTP_RPC module uses the xHTTP module to handle HTTP requests.
		Read the documentation of the xHTTP module for more details.
	</para>

	<section>
	<title>Limitations</title>
	<itemizedlist>
	<listitem>
	<para>
		This module does not implement asynchronous RPC commands.
		It is unlikely that asynchronous RPC commands will be executed
		from an RPC web interface.
	</para>
	</listitem>
	<listitem>
	<para>
		This module does not accept parameters embedded in a structure
		(see RPC documentation for more info about how parameters can be
		passed to RPC).
	</para>
	</listitem>
	<listitem>
	<para>
		At startup, all RPC commands are sorted and grouped based on
		their format. The expected format is [group].[subcommand].
		The initial xhttp_rpc webpage displays all the retrieved groups.
		All RPC commands are available as sub-menus of each [group].
		If an RPC command is not in the expected format, it will be
		dropped from the initial xhttp_rpc home page menu.
	</para>
	</listitem>
	</itemizedlist>
	</section>
	</section>

	<section>
	<title>Dependencies</title>
	<section>
		<title>&kamailio; Modules</title>
		<para>
		The following modules must be loaded before this module:
			<itemizedlist>
			<listitem>
			<para>
				<emphasis>xhttp</emphasis> - xHTTP.
			</para>
			</listitem>
			</itemizedlist>
		</para>
	</section>
	<section>
		<title>External Libraries or Applications</title>
		<para>
		The following libraries or applications must be installed before running
		&kamailio; with this module loaded:
			<itemizedlist>
			<listitem>
			<para>
				<emphasis>None</emphasis>
			</para>
			</listitem>
			</itemizedlist>
		</para>
	</section>
	</section>
	<section>
	<title>Parameters</title>
	<section>
		<title><varname>xhttp_rpc_root</varname> (str)</title>
		<para>
			Specifies the root path for RPC http requests.
			The link to the RPC web interface must be constructed
			using the following pattern:
			http://[server_IP]:[tcp_port]/[xhttp_rpc_root] 
		</para>
		<para>
		<emphasis>
			Default value is "rpc".
		</emphasis>
		</para>
		<example>
		<title>Set <varname>xhttp_rpc_root</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("xhttp_rpc", "xhttp_rpc_root", "http_rpc")
...
</programlisting>
		</example>
	</section>
	<section>
		<title><varname>xhttp_rpc_buf_size</varname> (str)</title>
		<para>
			Specifies the maximum length of the buffer (in bytes) used
			to write the RPC reply information in order to
			build the HTML response.
		</para>
		<para>
		<emphasis>
			Default value is 0 (auto set to 1/3 of the size of the configured pkg mem).
		</emphasis>
		</para>
		<example>
		<title>Set <varname>xhttp_rpc_buf_size</varname> parameter</title>
		<programlisting format="linespecific">
...
modparam("xhttp", "xhttp_rpc_buf_size", 1024)
...
</programlisting>
		</example>
	</section>
	</section>

	<section>
	<title>Functions</title>
 	<section>
	    <title>
		<function moreinfo="none">dispatch_xhttp_rpc()</function>
	    </title>
	    <para>
		Handle the HTTP request and generate a response.
	    </para>
		<example>
		<title><function>dispatch_xhttp_rpc</function> usage</title>
		<programlisting format="linespecific">
...
tcp_accept_no_cl=yes
...
loadmodule "sl.so"
loadmodule "xhttp.so"
loadmodule "xhttp_rpc.so"
...
modparam("xhttp_rpc", "xhttp_rpc_root", "http_rpc")
...
event_route[xhttp:request] {
	$var(xhttp_rpc_root) = $(hu{s.substr,0,9});
	if ($var(xhttp_rpc_root) == "/http_rpc")
		dispatch_xhttp_rpc();
	else
		xhttp_reply("200", "OK", "text/html",
        		"&lt;html&gt;&lt;body&gt;Wrong URL $hu&lt;/body&gt;&lt;/html&gt;");
}
...
</programlisting>
	    </example>
	</section>
	</section>
	<section>
	<title>Usage</title>
	    <para>
		The module is not intended to be used in a "scripted" mode with
		command line tools.
		It only provides a simple web interface with all the available
		RPC commands. Point a web browser to http://serverip:port/http_rpc
		and browse through the available rpc commands.
		</para>
		<para>
		If you don't configure a dedicated port for HTTP, then you have
		to use same port as for SIP TCP. If you load and configure TLS
		module, then you can browse using HTTPS to the SIP TLS port.
		</para>
	</section>
</chapter>

