Pool: raise custom error when DB::PoolTimeout

src/invidious/connection/pool.cr

@@ -72,7 +72,7 @@ module Invidious::ConnectionPool
       response = yield http_client
     rescue ex : DB::PoolTimeout
       # Failed to checkout a client
-      raise ConnectionPool::Error.new(ex.message, cause: ex)
+      raise ConnectionPool::PoolCheckoutError.new(ex.message)
     rescue ex
       # An error occurred with the client itself.
       # Delete the client from the pool and close the connection
@@ -131,6 +131,10 @@ module Invidious::ConnectionPool
   class Error < Exception
   end
 
+  # Raised when the pool failed to get a client in time
+  class PoolCheckoutError < Error
+  end
+
   # Mapping of subdomain => Invidious::ConnectionPool::Pool
   # This is needed as we may need to access arbitrary subdomains of ytimg
   private YTIMG_POOLS = {} of String => ConnectionPool::Pool