patch for ignoring tracking id already registered

gistfile1.diff

--- ngx_http_uploadprogress_module_ori.c        2012-05-14 14:10:18.000000000 +0200
+++ ngx_http_uploadprogress_module.c    2012-05-14 17:23:36.000000000 +0200
@@ -66,6 +66,7 @@
     ngx_array_t                      templates;
     ngx_str_t                        header;
     ngx_str_t                        jsonp_parameter;
+    ngx_flag_t                       noerror_if_exist;
 } ngx_http_uploadprogress_conf_t;

 typedef struct {
@@ -174,6 +175,13 @@
      offsetof(ngx_http_uploadprogress_conf_t, jsonp_parameter),
      NULL},

+    {ngx_string("upload_progress_noerror_if_exist"),
+     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_uploadprogress_conf_t, noerror_if_exist),
+     NULL},
+
     ngx_null_command
 };

@@ -799,13 +807,23 @@
     if (find_node(id, ctx, r->connection->log) != NULL) {
         ngx_shmtx_unlock(&shpool->mutex);
         /* already found a node with matching progress ID */
+
+
+        if (upcf->noerror_if_exist) {
         ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
-                      "upload_progress: tracking already registered id: %V", id);
+                          "upload_progress: ignoring tracking already registered id: %V", id);
+            ngx_free(id);
+            return NGX_DECLINED;

+        } else {
+            ngx_log_error(NGX_LOG_INFO, r->connection->log, 0,
+                          "upload_progress: tracking already registered id: %V", id);
         ngx_free(id);
         return NGX_HTTP_INTERNAL_SERVER_ERROR;
     }

+    }
+
     cln = ngx_pool_cleanup_add(r->pool, sizeof(ngx_http_uploadprogress_cleanup_t));
     if (cln == NULL) {
         ngx_shmtx_unlock(&shpool->mutex);
@@ -1250,6 +1268,8 @@
         return NGX_CONF_ERROR;
     }

+    conf->noerror_if_exist = NGX_CONF_UNSET;
+
     if(ngx_array_init(&conf->templates, cf->pool, 4, sizeof(ngx_http_uploadprogress_template_t)) != NGX_OK) {
         return NGX_CONF_ERROR;
     }
@@ -1284,6 +1304,11 @@
         conf->track = prev->track;
     }

+    if (conf->noerror_if_exist == NGX_CONF_UNSET) {
+        conf->noerror_if_exist = (prev->noerror_if_exist != NGX_CONF_UNSET) ?
+            prev->noerror_if_exist : 0;
+    }
+
     ngx_conf_merge_str_value(conf->content_type, prev->content_type, "text/javascript");

     t = conf->templates.elts;