[PATCH 11 of 13] Request body: $content_length variable to honor real body size

[Maxim Dounin]

# HG changeset patch
# User Maxim Dounin <mdounin at mdounin.ru>
# Date 1352393278 -14400
# Node ID ec54ef6b4826b3fa6d0f310cb4d80291dcdc7d3f
# Parent  a3bad06d0ab3874b7479823f1c7240306792a110
Request body: $content_length variable to honor real body size.

This allows to handle requests with chunked body by fastcgi and uwsgi
modules, and also simplifies handling of various request body modifications.

diff --git a/src/http/ngx_http_variables.c b/src/http/ngx_http_variables.c
--- a/src/http/ngx_http_variables.c
+++ b/src/http/ngx_http_variables.c
@@ -39,6 +39,8 @@ static ngx_int_t ngx_http_variable_tcpin
     ngx_http_variable_value_t *v, uintptr_t data);
 #endif
 
+static ngx_int_t ngx_http_variable_content_length(ngx_http_request_t *r,
+    ngx_http_variable_value_t *v, uintptr_t data);
 static ngx_int_t ngx_http_variable_host(ngx_http_request_t *r,
     ngx_http_variable_value_t *v, uintptr_t data);
 static ngx_int_t ngx_http_variable_binary_remote_addr(ngx_http_request_t *r,
@@ -153,8 +155,8 @@ static ngx_http_variable_t  ngx_http_cor
     { ngx_string("http_cookie"), NULL, ngx_http_variable_headers,
       offsetof(ngx_http_request_t, headers_in.cookies), 0, 0 },
 
-    { ngx_string("content_length"), NULL, ngx_http_variable_header,
-      offsetof(ngx_http_request_t, headers_in.content_length), 0, 0 },
+    { ngx_string("content_length"), NULL, ngx_http_variable_content_length,
+      0, 0, 0 },
 
     { ngx_string("content_type"), NULL, ngx_http_variable_header,
       offsetof(ngx_http_request_t, headers_in.content_type), 0, 0 },
@@ -990,6 +992,39 @@ ngx_http_variable_tcpinfo(ngx_http_reque
 
 
 static ngx_int_t
+ngx_http_variable_content_length(ngx_http_request_t *r,
+    ngx_http_variable_value_t *v, uintptr_t data)
+{
+    u_char  *p;
+
+    if (r->headers_in.content_length) {
+        v->len = r->headers_in.content_length->value.len;
+        v->data = r->headers_in.content_length->value.data;
+        v->valid = 1;
+        v->no_cacheable = 0;
+        v->not_found = 0;
+
+    } else if (r->headers_in.content_length_n >= 0) {
+        p = ngx_pnalloc(r->pool, NGX_OFF_T_LEN);
+        if (p == NULL) {
+            return NGX_ERROR;
+        }
+
+        v->len = ngx_sprintf(p, "%O", r->headers_in.content_length_n) - p;
+        v->data = p;
+        v->valid = 1;
+        v->no_cacheable = 0;
+        v->not_found = 0;
+
+    } else {
+        v->not_found = 1;
+    }
+
+    return NGX_OK;
+}
+
+
+static ngx_int_t
 ngx_http_variable_host(ngx_http_request_t *r, ngx_http_variable_value_t *v,
     uintptr_t data)
 {