From 37ca621301134d567fbaa7cbbc84b3c10807726c Mon Sep 17 00:00:00 2001
From: Roger Dingledine <arma@torproject.org>
Date: Thu, 10 Feb 2005 06:31:34 +0000
Subject: [PATCH] when a client asks us for a dir mirror and we don't have one,
 launch an attempt to get a fresh one.

svn:r3609
---
 src/or/connection.c | 17 +++++++++++++++++
 src/or/directory.c  |  7 +++++++
 2 files changed, 24 insertions(+)

diff --git a/src/or/connection.c b/src/or/connection.c
index d410e9b895..6fd80c8745 100644
--- a/src/or/connection.c
+++ b/src/or/connection.c
@@ -1256,6 +1256,23 @@ connection_t *connection_get_by_type_state(int type, int state) {
   return NULL;
 }
 
+/** Return a connection of type <b>type</b> that has purpose <b>purpose</b>,
+ * and that is not marked for close.
+ */
+connection_t *connection_get_by_type_purpose(int type, int purpose) {
+  int i, n;
+  connection_t *conn;
+  connection_t **carray;
+
+  get_connection_array(&carray,&n);
+  for (i=0;i<n;i++) {
+    conn = carray[i];
+    if (conn->type == type && conn->purpose == purpose && !conn->marked_for_close)
+      return conn;
+  }
+  return NULL;
+}
+
 /** Return the connection of type <b>type</b> that is in state
  * <b>state</b>, that was written to least recently, and that is not
  * marked for close.
diff --git a/src/or/directory.c b/src/or/directory.c
index 29e86d7620..6cb6b64c93 100644
--- a/src/or/directory.c
+++ b/src/or/directory.c
@@ -876,6 +876,9 @@ directory_handle_command_get(connection_t *conn, char *headers,
     if (dlen == 0) {
       log_fn(LOG_NOTICE,"Client asked for the mirrored directory, but we don't have a good one yet. Sending 503 Dir not available.");
       write_http_status_line(conn, 503, "Directory unavailable");
+      /* try to get a new one now */
+      if (!connection_get_by_type_purpose(CONN_TYPE_DIR, DIR_PURPOSE_FETCH_DIR))
+        directory_get_from_dirserver(DIR_PURPOSE_FETCH_DIR, NULL, 1);
       return 0;
     }
 
@@ -898,6 +901,10 @@ directory_handle_command_get(connection_t *conn, char *headers,
     dlen = dirserv_get_runningrouters(&cp, deflated);
     if (!dlen) { /* we failed to create/cache cp */
       write_http_status_line(conn, 503, "Directory unavailable");
+      /* try to get a new one now */
+      if (!connection_get_by_type_purpose(CONN_TYPE_DIR,
+                                          DIR_PURPOSE_FETCH_RUNNING_LIST))
+        directory_get_from_dirserver(DIR_PURPOSE_FETCH_RUNNING_LIST, NULL, 1);
       return 0;
     }