Stream: added ngx_stream_mqtt_preread_module module.

This adds a new directive:

- mqtt_preread: enables extracting information from the MQTT CONNECT message

Syntax:    mqtt_preread on | off;
Default:   mqtt_preread off;
Context:   stream, server


The ngx_stream_mqtt_preread_module module allows extracting information
from the CONNECT message of the Message Queuing Telemetry Transport (MQTT) protocol,
versions 3.1.1 and 5.0.

Processing occurs at the preread stage and populates the following variables:

- $mqtt_preread_clientid
- $mqtt_preread_username

auto/modules

@@ -1255,6 +1255,17 @@ if [ $STREAM != NO ]; then
 
         . auto/module
     fi
+
+    if [ $STREAM_MQTT_PREREAD = YES ]; then
+        ngx_module_name=ngx_stream_mqtt_preread_module
+        ngx_module_incs=
+        ngx_module_deps=
+        ngx_module_srcs=src/stream/ngx_stream_mqtt_preread_module.c
+        ngx_module_libs=
+        ngx_module_link=$STREAM_MQTT_PREREAD
+
+        . auto/module
+    fi
 fi
 
 

auto/options

@@ -136,6 +136,7 @@ STREAM_UPSTREAM_LEAST_CONN=YES
 STREAM_UPSTREAM_RANDOM=YES
 STREAM_UPSTREAM_ZONE=YES
 STREAM_SSL_PREREAD=NO
+STREAM_MQTT_PREREAD=NO
 
 DYNAMIC_MODULES=
 DYNAMIC_MODULES_SRCS=
@@ -338,6 +339,8 @@ use the \"--with-mail_ssl_module\" option instead"
                                          STREAM_GEOIP=DYNAMIC       ;;
         --with-stream_ssl_preread_module)
                                          STREAM_SSL_PREREAD=YES     ;;
+        --with-stream_mqtt_preread_module)
+                                         STREAM_MQTT_PREREAD=YES    ;;
         --without-stream_limit_conn_module)
                                          STREAM_LIMIT_CONN=NO       ;;
         --without-stream_access_module)  STREAM_ACCESS=NO           ;;
@@ -564,6 +567,7 @@ cat << END
   --with-stream_geoip_module         enable ngx_stream_geoip_module
   --with-stream_geoip_module=dynamic enable dynamic ngx_stream_geoip_module
   --with-stream_ssl_preread_module   enable ngx_stream_ssl_preread_module
+  --with-stream_mqtt_preread_module  enable ngx_stream_mqtt_preread_module
   --without-stream_limit_conn_module disable ngx_stream_limit_conn_module
   --without-stream_access_module     disable ngx_stream_access_module
   --without-stream_geo_module        disable ngx_stream_geo_module

docs/xml/angie/changes.xml

@@ -7,6 +7,19 @@
 
 <changes ver="1.4.0" date="">
 
+<change type="feature">
+<para lang="ru">
+директива "mqtt_preread" модуля "stream", позволяющая помещать имя пользователя
+и идентификатор клиента из пакета CONNECT протокола MQTT в переменные
+$mqtt_preread_username и $mqtt_preread_clientid.
+</para>
+<para lang="en">
+"mqtt_preread" directive in the "stream" module, which allows extracting
+the username and client id from the CONNECT packet of the MQTT protocol into
+the $mqtt_preread_username and $mqtt_preread_clientid variables.
+</para>
+</change>
+
 <change type="feature">
 <para lang="ru">
 ограничение скорости отдачи MP4-файлов клиенту пропорционально битрейту