Stream: added preconfiguration step.

diff --git a/src/stream/ngx_stream.c b/src/stream/ngx_stream.c
index 5e7abae..ea73145 100644
--- a/src/stream/ngx_stream.c
+++ b/src/stream/ngx_stream.c

@@ -143,11 +143,26 @@
     }
 
 
-    /* parse inside the stream{} block */
-
     pcf = *cf;
     cf->ctx = ctx;
 
+    for (m = 0; cf->cycle->modules[m]; m++) {
+        if (cf->cycle->modules[m]->type != NGX_STREAM_MODULE) {
+            continue;
+        }
+
+        module = cf->cycle->modules[m]->ctx;
+
+        if (module->preconfiguration) {
+            if (module->preconfiguration(cf) != NGX_OK) {
+                return NGX_CONF_ERROR;
+            }
+        }
+    }
+
+
+    /* parse inside the stream{} block */
+
     cf->module_type = NGX_STREAM_MODULE;
     cf->cmd_type = NGX_STREAM_MAIN_CONF;
     rv = ngx_conf_parse(cf, NULL);

diff --git a/src/stream/ngx_stream.h b/src/stream/ngx_stream.h
index 1c35173..ffa855c 100644
--- a/src/stream/ngx_stream.h
+++ b/src/stream/ngx_stream.h

@@ -145,6 +145,7 @@
 
 
 typedef struct {
+    ngx_int_t             (*preconfiguration)(ngx_conf_t *cf);
     ngx_int_t             (*postconfiguration)(ngx_conf_t *cf);
 
     void                 *(*create_main_conf)(ngx_conf_t *cf);

diff --git a/src/stream/ngx_stream_access_module.c b/src/stream/ngx_stream_access_module.c
index 64869d2..6985d36 100644
--- a/src/stream/ngx_stream_access_module.c
+++ b/src/stream/ngx_stream_access_module.c

@@ -88,6 +88,7 @@
 
 
 static ngx_stream_module_t  ngx_stream_access_module_ctx = {
+    NULL,                                  /* preconfiguration */
     ngx_stream_access_init,                /* postconfiguration */
 
     NULL,                                  /* create main configuration */

diff --git a/src/stream/ngx_stream_core_module.c b/src/stream/ngx_stream_core_module.c
index 075db82..2ed792b 100644
--- a/src/stream/ngx_stream_core_module.c
+++ b/src/stream/ngx_stream_core_module.c

@@ -57,6 +57,7 @@
 
 
 static ngx_stream_module_t  ngx_stream_core_module_ctx = {
+    NULL,                                  /* preconfiguration */
     NULL,                                  /* postconfiguration */
 
     ngx_stream_core_create_main_conf,      /* create main configuration */

diff --git a/src/stream/ngx_stream_limit_conn_module.c b/src/stream/ngx_stream_limit_conn_module.c
index c27d748..8c70a82 100644
--- a/src/stream/ngx_stream_limit_conn_module.c
+++ b/src/stream/ngx_stream_limit_conn_module.c

@@ -93,6 +93,7 @@
 
 
 static ngx_stream_module_t  ngx_stream_limit_conn_module_ctx = {
+    NULL,                                  /* preconfiguration */
     ngx_stream_limit_conn_init,            /* postconfiguration */
 
     NULL,                                  /* create main configuration */

diff --git a/src/stream/ngx_stream_proxy_module.c b/src/stream/ngx_stream_proxy_module.c
index d7df72c..fdffd15 100644
--- a/src/stream/ngx_stream_proxy_module.c
+++ b/src/stream/ngx_stream_proxy_module.c

@@ -314,6 +314,7 @@
 
 
 static ngx_stream_module_t  ngx_stream_proxy_module_ctx = {
+    NULL,                                  /* preconfiguration */
     NULL,                                  /* postconfiguration */
 
     NULL,                                  /* create main configuration */

diff --git a/src/stream/ngx_stream_ssl_module.c b/src/stream/ngx_stream_ssl_module.c
index 9c559c6..095bdae 100644
--- a/src/stream/ngx_stream_ssl_module.c
+++ b/src/stream/ngx_stream_ssl_module.c

@@ -132,6 +132,7 @@
 
 
 static ngx_stream_module_t  ngx_stream_ssl_module_ctx = {
+    NULL,                                  /* preconfiguration */
     NULL,                                  /* postconfiguration */
 
     NULL,                                  /* create main configuration */

diff --git a/src/stream/ngx_stream_upstream.c b/src/stream/ngx_stream_upstream.c
index 69dddc5..36d05cc 100644
--- a/src/stream/ngx_stream_upstream.c
+++ b/src/stream/ngx_stream_upstream.c

@@ -39,6 +39,7 @@
 
 
 static ngx_stream_module_t  ngx_stream_upstream_module_ctx = {
+    NULL,                                  /* preconfiguration */
     NULL,                                  /* postconfiguration */
 
     ngx_stream_upstream_create_main_conf,  /* create main configuration */

diff --git a/src/stream/ngx_stream_upstream_hash_module.c b/src/stream/ngx_stream_upstream_hash_module.c
index 56ff7d6..f200f47 100644
--- a/src/stream/ngx_stream_upstream_hash_module.c
+++ b/src/stream/ngx_stream_upstream_hash_module.c

@@ -76,6 +76,7 @@
 
 
 static ngx_stream_module_t  ngx_stream_upstream_hash_module_ctx = {
+    NULL,                                  /* preconfiguration */
     NULL,                                  /* postconfiguration */
 
     NULL,                                  /* create main configuration */

diff --git a/src/stream/ngx_stream_upstream_least_conn_module.c b/src/stream/ngx_stream_upstream_least_conn_module.c
index c9719f9..359d788 100644
--- a/src/stream/ngx_stream_upstream_least_conn_module.c
+++ b/src/stream/ngx_stream_upstream_least_conn_module.c

@@ -32,6 +32,7 @@
 
 
 static ngx_stream_module_t  ngx_stream_upstream_least_conn_module_ctx = {
+    NULL,                                    /* preconfiguration */
     NULL,                                    /* postconfiguration */
 
     NULL,                                    /* create main configuration */

diff --git a/src/stream/ngx_stream_upstream_zone_module.c b/src/stream/ngx_stream_upstream_zone_module.c
index ffc9e8a..ddcc093 100644
--- a/src/stream/ngx_stream_upstream_zone_module.c
+++ b/src/stream/ngx_stream_upstream_zone_module.c

@@ -32,6 +32,7 @@
 
 
 static ngx_stream_module_t  ngx_stream_upstream_zone_module_ctx = {
+    NULL,                                  /* preconfiguration */
     NULL,                                  /* postconfiguration */
 
     NULL,                                  /* create main configuration */