fix: ensure timeout not nil to avoid attempt to perform arithmetic on a nil value error (#214)

Author: nic-chen

.github/workflows/ci.yml

@@ -56,7 +56,7 @@ jobs:
           git clone https://github.com/openresty/test-nginx.git test-nginx
           cd test-nginx && (sudo cpanm --notest . > build.log 2>&1 || (cat build.log && exit 1)) && cd ..
 
-          wget https://raw.githubusercontent.com/api7/apisix-build-tools/master/build-apisix-base.sh
+          wget https://raw.githubusercontent.com/api7/apisix-build-tools/refs/tags/apisix-base/1.21.4.2.2/build-apisix-base.sh
           chmod +x build-apisix-base.sh
           OR_PREFIX=$OPENRESTY_PREFIX ./build-apisix-base.sh latest
 

lib/resty/etcd/v3.lua

@@ -507,7 +507,8 @@ function refresh_jwt_token(self, timeout)
     end
 
     if self.requesting_token then
-        self.sema:wait(timeout)
+        local wait_timeout = timeout or self.timeout or 0
+        self.sema:wait(wait_timeout)
         if self.jwt_token and now() - self.last_auth_time < 60 * 3 + random(0, 60) then
             return true, nil
         end