HTTP: added basic URI rewrite.

This commit introduced the basic URI rewrite. It allows users to change request URI. Note the "rewrite" option ignores the contained query if any and the query from the request is preserverd.
An example:
"routes": [
    {
        "match": {
            "uri": "/v1/test"
        },
        "action": {
            "return": 200
        }
    },
    {
        "action": {
            "rewrite": "/v1$uri",
            "pass": "routes"
        }
    }
]

Reviewed-by: Alejandro Colomar <alx@nginx.com>

1 files changed, 16 insertions, 4 deletions

diff --git a/src/nxt_http_route.c b/src/nxt_http_route.c
index f439c957..0935dd4a 100644
--- a/src/nxt_http_route.c
+++ b/src/nxt_http_route.c
@@ -579,6 +579,11 @@ nxt_http_route_match_create(nxt_task_t *task, nxt_router_temp_conf_t *tmcf,
 
 static nxt_conf_map_t  nxt_http_route_action_conf[] = {
     {
+        nxt_string("rewrite"),
+        NXT_CONF_MAP_PTR,
+        offsetof(nxt_http_action_conf_t, rewrite)
+    },
+    {
         nxt_string("pass"),
         NXT_CONF_MAP_PTR,
         offsetof(nxt_http_action_conf_t, pass)
@@ -659,6 +664,13 @@ nxt_http_action_init(nxt_task_t *task, nxt_router_temp_conf_t *tmcf,
     rtcf = tmcf->router_conf;
     mp = rtcf->mem_pool;
 
+    if (acf.rewrite != NULL) {
+        ret = nxt_http_rewrite_init(rtcf, action, &acf);
+        if (nxt_slow_path(ret != NXT_OK)) {
+            return ret;
+        }
+    }
+
     if (acf.ret != NULL) {
         return nxt_http_return_init(rtcf, action, &acf);
     }
@@ -1312,8 +1324,8 @@ nxt_http_pass_var(nxt_task_t *task, nxt_http_request_t *r,
         goto fail;
     }
 
-    action = nxt_mp_get(r->mem_pool,
-                        sizeof(nxt_http_action_t) + sizeof(nxt_str_t));
+    action = nxt_mp_zget(r->mem_pool,
+                         sizeof(nxt_http_action_t) + sizeof(nxt_str_t));
     if (nxt_slow_path(action == NULL)) {
         goto fail;
     }
@@ -1496,7 +1508,7 @@ nxt_http_action_create(nxt_task_t *task, nxt_router_temp_conf_t *tmcf,
     rtcf = tmcf->router_conf;
     mp = rtcf->mem_pool;
 
-    action = nxt_mp_alloc(mp, sizeof(nxt_http_action_t));
+    action = nxt_mp_zalloc(mp, sizeof(nxt_http_action_t));
     if (nxt_slow_path(action == NULL)) {
         return NULL;
     }
@@ -1525,7 +1537,7 @@ nxt_http_pass_application(nxt_task_t *task, nxt_router_conf_t *rtcf,
 {
     nxt_http_action_t  *action;
 
-    action = nxt_mp_alloc(rtcf->mem_pool, sizeof(nxt_http_action_t));
+    action = nxt_mp_zalloc(rtcf->mem_pool, sizeof(nxt_http_action_t));
     if (nxt_slow_path(action == NULL)) {
         return NULL;
     }