commit 6f418a3d01c8922c706a133cd45c2e0212d4f9dc
author Dmitry Volyntsev <xeioex@nginx.com> Wed Mar 23 17:44:36 2016 +0300
committer Dmitry Volyntsev <xeioex@nginx.com> Wed Mar 23 17:44:36 2016 +0300
tree 281c7e5cb5b35dba3a6b1f5f2930eca4dbc0198e
parent cb00a7de88ddbf87aa46d32a8c9006c5b6490db2

Resolver: introduced valid field in resolver responses.

It hints the amount of time a response could be considered
as valid.

src/core/ngx_resolver.c

diff --git a/src/core/ngx_resolver.c b/src/core/ngx_resolver.c
index 7f0d3ad..40eefc5 100644
--- a/src/core/ngx_resolver.c
+++ b/src/core/ngx_resolver.c
@@ -551,6 +551,7 @@
 
                 do {
                     ctx->state = NGX_OK;
+                    ctx->valid = rn->valid;
                     ctx->naddrs = naddrs;
 
                     if (addrs == NULL) {
@@ -597,6 +598,7 @@
 
             do {
                 ctx->state = NGX_RESOLVE_NXDOMAIN;
+                ctx->valid = ngx_time() + (r->valid ? r->valid : 10);
                 next = ctx->next;
 
                 ctx->handler(ctx);
@@ -859,6 +861,7 @@
             /* unlock addr mutex */
 
             ctx->state = NGX_OK;
+            ctx->valid = rn->valid;
 
             ctx->handler(ctx);
 
@@ -1948,6 +1951,7 @@
         while (next) {
             ctx = next;
             ctx->state = code;
+            ctx->valid = ngx_time() + (r->valid ? r->valid : 10);
             next = ctx->next;
 
             ctx->handler(ctx);
@@ -2262,6 +2266,7 @@
         while (next) {
             ctx = next;
             ctx->state = NGX_OK;
+            ctx->valid = rn->valid;
             ctx->naddrs = naddrs;
 
             if (addrs == NULL) {
@@ -2541,6 +2546,7 @@
         while (next) {
             ctx = next;
             ctx->state = code;
+            ctx->valid = ngx_time() + (r->valid ? r->valid : 10);
             next = ctx->next;
 
             ctx->handler(ctx);
@@ -2675,6 +2681,7 @@
     while (next) {
         ctx = next;
         ctx->state = NGX_OK;
+        ctx->valid = rn->valid;
         ctx->name = name;
         next = ctx->next;
 

src/core/ngx_resolver.h

diff --git a/src/core/ngx_resolver.h b/src/core/ngx_resolver.h
index 3165abd..3e93f4d 100644
--- a/src/core/ngx_resolver.h
+++ b/src/core/ngx_resolver.h
@@ -164,6 +164,7 @@
     ngx_int_t                 state;
     ngx_str_t                 name;
 
+    time_t                    valid;
     ngx_uint_t                naddrs;
     ngx_addr_t               *addrs;
     ngx_addr_t                addr;