Add temp logging to debug SSL error.

lib/rpush/daemon/apns2/delivery.rb

@@ -17,7 +17,11 @@ def initialize(app, http2_client, batch)
 
         def perform
           @batch.each_notification do |notification|
-            prepare_async_post(notification)
+            begin
+              prepare_async_post(notification)
+            rescue OpenSSL::SSL::SSLError => error
+              log_error("Notification #{notification.id} failed with SSL error")
+            end
           end
 
           # Send all preprocessed requests at once

spec/functional/apns2_spec.rb

@@ -254,6 +254,18 @@ def create_notification
       end
     end
 
+    context 'when SSL error occurs' do
+      before(:each) do
+        expect(fake_client).to receive(:call_async) { raise(OpenSSL::SSL::SSLError) }
+      end
+
+      it 'logs the error' do
+        expect(Rpush.logger).to receive(:error)
+        create_notification
+        Rpush.push
+      end
+    end
+
     context 'when waiting for requests to complete times out' do
       let(:on_close) do
         proc { |&block| @thread = Thread.new { sleep(0.01) } }