Gracefully handle disconnected clients

We'll get `Errno::ECONNRESET` if the client forcibly disconnected.
Just close the socket rather than raising the exception.

Handle other errors in `ClientSocket#write`, too, mirroring the Faye
error handling which swallows all `StandardError` on write.

1 files changed, 2 insertions, 0 deletions

diff --git a/actioncable/lib/action_cable/connection/client_socket.rb b/actioncable/lib/action_cable/connection/client_socket.rb
index 9e4dbcd6e6..7d6de78582 100644
--- a/actioncable/lib/action_cable/connection/client_socket.rb
+++ b/actioncable/lib/action_cable/connection/client_socket.rb
@@ -71,6 +71,8 @@ module ActionCable
 
       def write(data)
         @stream.write(data)
+      rescue => e
+        emit_error e.message
       end
 
       def transmit(message)