nginx variables $start_msec and $msec

nginx125_msec.patch

From 2598ef9407d47eadbb4aaed329f3206082067fa8 Mon Sep 17 00:00:00 2001
From: Lawrence Pit <lawrence.pit@gmail.com>
Date: Sat, 1 Dec 2012 17:03:22 +1100
Subject: [PATCH] Feature: $start_msec and $msec http variables, useful for
 setting in proxy headers before sending request to backend
 servers so processing and queue times can be measured.

---
 src/http/ngx_http_variables.c | 55 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 55 insertions(+)

diff --git a/src/http/ngx_http_variables.c b/src/http/ngx_http_variables.c
index b0949c7..3fbbd2c 100644
--- a/src/http/ngx_http_variables.c
+++ b/src/http/ngx_http_variables.c
@@ -108,6 +108,10 @@ static ngx_int_t ngx_http_variable_hostname(ngx_http_request_t *r,
     ngx_http_variable_value_t *v, uintptr_t data);
 static ngx_int_t ngx_http_variable_pid(ngx_http_request_t *r,
     ngx_http_variable_value_t *v, uintptr_t data);
+static ngx_int_t ngx_http_variable_start_msec(ngx_http_request_t *r,
+    ngx_http_variable_value_t *v, uintptr_t data);
+static ngx_int_t ngx_http_variable_msec(ngx_http_request_t *r,
+    ngx_http_variable_value_t *v, uintptr_t data);
 
 /*
  * TODO:
@@ -285,6 +289,12 @@ static ngx_http_variable_t  ngx_http_core_variables[] = {
     { ngx_string("pid"), NULL, ngx_http_variable_pid,
       0, 0, 0 },
 
+    { ngx_string("start_msec"), NULL, ngx_http_variable_start_msec,
+      0, 0, 0 },
+
+    { ngx_string("msec"), NULL, ngx_http_variable_msec,
+      0, 0, 0 },
+
 #if (NGX_HAVE_TCP_INFO)
     { ngx_string("tcpinfo_rtt"), NULL, ngx_http_variable_tcpinfo,
       0, NGX_HTTP_VAR_NOCACHEABLE, 0 },
@@ -1915,6 +1925,51 @@ ngx_http_variable_pid(ngx_http_request_t *r,
 }
 
 
+static ngx_int_t
+ngx_http_variable_start_msec(ngx_http_request_t *r,
+    ngx_http_variable_value_t *v, uintptr_t data)
+{
+    u_char           *p;
+
+    p = ngx_pnalloc(r->pool, NGX_INT64_LEN);
+    if (p == NULL) {
+        return NGX_ERROR;
+    }
+
+    v->len = ngx_sprintf(p, "%T.%03M", r->start_sec, r->start_msec) - p;
+    v->valid = 1;
+    v->no_cacheable = 0;
+    v->not_found = 0;
+    v->data = p;
+
+    return NGX_OK;
+}
+
+
+static ngx_int_t
+ngx_http_variable_msec(ngx_http_request_t *r,
+    ngx_http_variable_value_t *v, uintptr_t data)
+{
+    u_char      *p;
+    ngx_time_t  *tp;
+
+    p = ngx_pnalloc(r->pool, NGX_TIME_T_LEN + 4);
+    if (p == NULL) {
+        return NGX_ERROR;
+    }
+
+    tp = ngx_timeofday();
+
+    v->len = ngx_sprintf(p, "%T.%03M", tp->sec, tp->msec) - p;
+    v->valid = 1;
+    v->no_cacheable = 0;
+    v->not_found = 0;
+    v->data = p;
+
+    return NGX_OK;
+}
+
+
 void *
 ngx_http_map_find(ngx_http_request_t *r, ngx_http_map_t *map, ngx_str_t *match)
 {
-- 
1.7.11.1