From d1dda93abd36b5e6fefaf74647c79f7ca239cb9e Mon Sep 17 00:00:00 2001
From: Alice39s <alice39s@xmsl.dev>
Date: Sun, 28 Jun 2026 05:10:04 +0900
Subject: [PATCH] fix(erlang): guard xdb:search against unconfigured pool

---
 binding/erlang/src/xdb.erl       | 25 +++++++++++++++----------
 binding/erlang/test/xdb_test.erl |  8 ++++++++
 2 files changed, 23 insertions(+), 10 deletions(-)

diff --git a/binding/erlang/src/xdb.erl b/binding/erlang/src/xdb.erl
index fa2ff83..66b1c0d 100644
--- a/binding/erlang/src/xdb.erl
+++ b/binding/erlang/src/xdb.erl
@@ -29,15 +29,20 @@ do_search(PoolName, Version, IpBin) ->
     case ets:lookup(CacheTable, IpBin) of
         [{_, Region}] -> Region;
         _ ->
-            Worker = poolboy:checkout(PoolName, true, infinity),
-            try
-                case ip2region_worker:search(Worker, IpBin) of
-                    {error, _} = Err -> Err;
-                    Region ->
-                        ets:insert(CacheTable, {IpBin, Region}),
-                        Region
-                end
-            after
-                poolboy:checkin(PoolName, Worker)
+            case whereis(PoolName) of
+                undefined ->
+                    {error, pool_not_configured};
+                _ ->
+                    Worker = poolboy:checkout(PoolName, true, infinity),
+                    try
+                        case ip2region_worker:search(Worker, IpBin) of
+                            {error, _} = Err -> Err;
+                            Region ->
+                                ets:insert(CacheTable, {IpBin, Region}),
+                                Region
+                        end
+                    after
+                        poolboy:checkin(PoolName, Worker)
+                    end
             end
     end.
diff --git a/binding/erlang/test/xdb_test.erl b/binding/erlang/test/xdb_test.erl
index a725709..aea2439 100644
--- a/binding/erlang/test/xdb_test.erl
+++ b/binding/erlang/test/xdb_test.erl
@@ -34,6 +34,14 @@ invalid_search_test_() ->
         ?_assertEqual({error, bad_ip_format}, xdb:search({1,2,3}))
     ].
 
+ipv6_pool_not_configured_test() ->
+    try application:stop(ip2region) catch _:_ -> ok end,
+    try application:unload(ip2region) catch _:_ -> ok end,
+    ok = application:load(ip2region),
+    ok = application:set_env(ip2region, db, [{ipv4, "ip2region.xdb"}]),
+    {ok, _} = application:ensure_all_started(ip2region),
+    ?assertEqual({error, pool_not_configured}, xdb:search("2001:4860:4860::8888")).
+
 setup_ipv6() ->
     try application:stop(ip2region) catch _:_ -> ok end,
     try application:unload(ip2region) catch _:_ -> ok end,