v3_default_keepalive_patch

diff --git a/auto/modules b/auto/modules
index a78e785..30e1645 100644
--- a/auto/modules
+++ b/auto/modules
@@ -376,6 +376,7 @@ if [ $HTTP_UPSTREAM_LEAST_CONN = YES ]; then
 fi
 
 if [ $HTTP_UPSTREAM_KEEPALIVE = YES ]; then
+    have=NGX_HTTP_UPSTREAM_KEEPALIVE . auto/have
     HTTP_MODULES="$HTTP_MODULES $HTTP_UPSTREAM_KEEPALIVE_MODULE"
     HTTP_SRCS="$HTTP_SRCS $HTTP_UPSTREAM_KEEPALIVE_SRCS"
 fi
diff --git a/src/http/modules/ngx_http_proxy_module.c b/src/http/modules/ngx_http_proxy_module.c
index 5e62caa..9fee00b 100644
--- a/src/http/modules/ngx_http_proxy_module.c
+++ b/src/http/modules/ngx_http_proxy_module.c
@@ -513,6 +513,22 @@ static ngx_command_t  ngx_http_proxy_commands[] = {
 
 #endif
 
+#if (NGX_HTTP_UPSTREAM_KEEPALIVE)
+    { ngx_string("proxy_upstream_default_keepalive"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_FLAG,
+      ngx_conf_set_flag_slot,
+      NGX_HTTP_LOC_CONF_OFFSET,
+      offsetof(ngx_http_proxy_loc_conf_t, upstream.default_keepalive),
+      NULL },
+
+    { ngx_string("proxy_upstream_default_keepalive_max_connections"),
+      NGX_HTTP_MAIN_CONF|NGX_HTTP_SRV_CONF|NGX_HTTP_LOC_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_size_slot,
+      NGX_HTTP_LOC_CONF_OFFSET,
+      offsetof(ngx_http_proxy_loc_conf_t, upstream.default_keepalive_max_connections),
+      NULL },
+#endif
+
       ngx_null_command
 };
 
@@ -2385,6 +2401,11 @@ ngx_http_proxy_create_loc_conf(ngx_conf_t *cf)
      *     conf->redirects = NULL;
      */
 
+#if (NGX_HTTP_UPSTREAM_KEEPALIVE)
+    conf->upstream.default_keepalive = NGX_CONF_UNSET;
+    conf->upstream.default_keepalive_max_connections = NGX_CONF_UNSET_SIZE;
+#endif
+
     conf->upstream.store = NGX_CONF_UNSET;
     conf->upstream.store_access = NGX_CONF_UNSET_UINT;
     conf->upstream.buffering = NGX_CONF_UNSET;
@@ -2467,6 +2488,20 @@ ngx_http_proxy_merge_loc_conf(ngx_conf_t *cf, void *parent, void *child)
         }
     }
 
+#if (NGX_HTTP_UPSTREAM_KEEPALIVE)
+    ngx_conf_merge_uint_value(conf->upstream.default_keepalive,
+                              prev->upstream.default_keepalive, 0);
+
+    ngx_conf_merge_size_value(conf->upstream.default_keepalive_max_connections,
+                              prev->upstream.default_keepalive_max_connections, 10);
+
+    if (conf->upstream.default_keepalive) {
+        if (ngx_http_upstream_default_keepalive_init(cf, &(conf->upstream)) != NGX_CONF_OK) {
+            return NGX_CONF_ERROR;
+        }
+    }
+#endif
+
     ngx_conf_merge_uint_value(conf->upstream.store_access,
                               prev->upstream.store_access, 0600);
 
diff --git a/src/http/modules/ngx_http_upstream_keepalive_module.c b/src/http/modules/ngx_http_upstream_keepalive_module.c
index eed1174..3723668 100644
--- a/src/http/modules/ngx_http_upstream_keepalive_module.c
+++ b/src/http/modules/ngx_http_upstream_keepalive_module.c
@@ -36,6 +36,8 @@ typedef struct {
     ngx_event_set_peer_session_pt      original_set_session;
     ngx_event_save_peer_session_pt     original_save_session;
 #endif
+    
+    ngx_str_t                          host;
 
 } ngx_http_upstream_keepalive_peer_data_t;
 
@@ -49,6 +51,9 @@ typedef struct {
     socklen_t                          socklen;
     u_char                             sockaddr[NGX_SOCKADDRLEN];
 
+    char                               host[NGX_MAXHOSTNAMELEN];
+    uint16_t                           host_len;
+
 } ngx_http_upstream_keepalive_cache_t;
 
 
@@ -184,6 +189,8 @@ ngx_http_upstream_init_keepalive_peer(ngx_http_request_t *r,
         return NGX_ERROR;
     }
 
+    kp->host = us->host;
+
     kp->conf = kcf;
     kp->upstream = r->upstream;
     kp->data = r->upstream->peer.data;
@@ -238,8 +245,9 @@ ngx_http_upstream_get_keepalive_peer(ngx_peer_connection_t *pc, void *data)
         c = item->connection;
 
         if (ngx_memn2cmp((u_char *) &item->sockaddr, (u_char *) pc->sockaddr,
-                         item->socklen, pc->socklen)
-            == 0)
+                         item->socklen, pc->socklen) == 0 &&
+            ngx_memn2cmp((u_char *) &item->host, (u_char *) kp->host.data,
+                         item->host_len, kp->host.len) == 0)
         {
             ngx_queue_remove(q);
             ngx_queue_insert_head(&kp->conf->free, q);
@@ -345,6 +353,8 @@ ngx_http_upstream_free_keepalive_peer(ngx_peer_connection_t *pc, void *data,
 
     item->socklen = pc->socklen;
     ngx_memcpy(&item->sockaddr, pc->sockaddr, pc->socklen);
+    item->host_len = kp->host.len;
+    ngx_memcpy(&item->host, kp->host.data, ngx_min(kp->host.len, NGX_MAXHOSTNAMELEN));
 
     if (c->read->ready) {
         ngx_http_upstream_keepalive_close_handler(c->read);
@@ -537,3 +547,77 @@ invalid:
 
     return NGX_CONF_ERROR;
 }
+
+char *
+ngx_http_upstream_default_keepalive_init(ngx_conf_t *cf, 
+    ngx_http_upstream_conf_t *umcf)
+{
+    ngx_uint_t                                    i;
+    ngx_http_upstream_keepalive_cache_t          *cached;
+    ngx_http_upstream_keepalive_srv_conf_t       *kcf;
+
+    kcf = ngx_pcalloc(cf->pool, 
+        sizeof(ngx_http_upstream_keepalive_srv_conf_t));
+    if (kcf == NULL) {
+        return NGX_CONF_ERROR;
+    }
+
+    kcf->max_cached = umcf->default_keepalive_max_connections;
+
+    cached = ngx_pcalloc(cf->pool, 
+        sizeof(ngx_http_upstream_keepalive_cache_t) * kcf->max_cached);
+    if (cached == NULL) {
+        return NGX_CONF_ERROR;
+    }
+
+    ngx_queue_init(&kcf->cache);
+    ngx_queue_init(&kcf->free);
+
+    for (i = 0; i < kcf->max_cached; i += 1) {
+        ngx_queue_insert_head(&kcf->free, &cached[i].queue);
+        cached[i].conf = kcf;
+    }
+
+    umcf->default_keepalive_cache = kcf;
+
+    return NGX_CONF_OK;
+}
+
+ngx_int_t
+ngx_http_upstream_default_keepalive_adapt_peer(ngx_http_request_t *r, 
+    ngx_http_upstream_resolved_t *ur)
+{
+    ngx_http_upstream_keepalive_peer_data_t  *kp;
+    ngx_http_upstream_keepalive_srv_conf_t   *kcf;
+
+    ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
+                   "default keepalive adapt peer");
+
+    kcf = r->upstream->conf->default_keepalive_cache;
+
+    kp = ngx_palloc(r->pool, sizeof(ngx_http_upstream_keepalive_peer_data_t));
+    if (kp == NULL) {
+        return NGX_ERROR;
+    }
+
+    kp->host = ur->host; 
+
+    kp->conf = kcf;
+    kp->upstream = r->upstream;
+    kp->data = r->upstream->peer.data;
+    kp->original_get_peer = r->upstream->peer.get;
+    kp->original_free_peer = r->upstream->peer.free;
+
+    r->upstream->peer.data = kp;
+    r->upstream->peer.get = ngx_http_upstream_get_keepalive_peer;
+    r->upstream->peer.free = ngx_http_upstream_free_keepalive_peer;
+
+#if (NGX_HTTP_SSL)
+    kp->original_set_session = r->upstream->peer.set_session;
+    kp->original_save_session = r->upstream->peer.save_session;
+    r->upstream->peer.set_session = ngx_http_upstream_keepalive_set_session;
+    r->upstream->peer.save_session = ngx_http_upstream_keepalive_save_session;
+#endif
+
+    return NGX_OK;
+}
diff --git a/src/http/ngx_http.h b/src/http/ngx_http.h
index d4dc1bd..4d54634 100644
--- a/src/http/ngx_http.h
+++ b/src/http/ngx_http.h
@@ -51,6 +51,10 @@ typedef u_char *(*ngx_http_log_handler_pt)(ngx_http_request_t *r,
 #if (NGX_HTTP_SSL)
 #include <ngx_http_ssl_module.h>
 #endif
+#if (NGX_HTTP_UPSTREAM_KEEPALIVE)
+#include <ngx_http_upstream_keepalive_module.h>
+#endif
+
 
 
 struct ngx_http_log_ctx_s {
diff --git a/src/http/ngx_http_upstream.c b/src/http/ngx_http_upstream.c
index 45e2eb7..2a2ca1c 100644
--- a/src/http/ngx_http_upstream.c
+++ b/src/http/ngx_http_upstream.c
@@ -931,6 +931,15 @@ ngx_http_upstream_resolve_handler(ngx_resolver_ctx_t *ctx)
         goto failed;
     }
 
+#if (NGX_HTTP_UPSTREAM_KEEPALIVE)
+    if (r->upstream->conf->default_keepalive) {
+        if (ngx_http_upstream_default_keepalive_adapt_peer(r, ur) != NGX_OK) {
+            ngx_log_debug0(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
+                           "http upstream default keepalive: can't keepalive peer");
+        }
+    }
+#endif
+
     ngx_resolve_name_done(ctx);
     ur->ctx = NULL;
 
diff --git a/src/http/ngx_http_upstream.h b/src/http/ngx_http_upstream.h
index 29ebf9b..7564050 100644
--- a/src/http/ngx_http_upstream.h
+++ b/src/http/ngx_http_upstream.h
@@ -194,6 +194,12 @@ typedef struct {
 #endif
 
     ngx_str_t                        module;
+
+#if (NGX_HTTP_UPSTREAM_KEEPALIVE)
+    ngx_uint_t                       default_keepalive;
+    ngx_uint_t                       default_keepalive_max_connections;
+    void                            *default_keepalive_cache;
+#endif
 } ngx_http_upstream_conf_t;