added backoff to push retry

Author: chillaq

lib/splitclient-rb/engine/sync_manager.rb

@@ -23,6 +23,7 @@ def initialize(config,
         @push_manager = push_manager
         @status_queue = status_queue
         @sse_connected = Concurrent::AtomicBoolean.new(false)
+        @back_off = Engine::BackOff.new(5, 3)
       end
 
       def start
@@ -119,7 +120,7 @@ def process_forced_stop
       end
 
       def process_disconnect(reconnect)
-        unless @sse_connected.value
+        unless @sse_connected.value || reconnect
           @config.logger.debug('Streaming already disconnected.') if @config.debug_enabled
           return
         end
@@ -130,6 +131,9 @@ def process_disconnect(reconnect)
         record_telemetry(Telemetry::Domain::Constants::SYNC_MODE, SYNC_MODE_POLLING)
 
         if reconnect
+          wait_interval = @back_off.interval
+          @config.logger.debug("Retrying streaming connection in: #{wait_interval} seconds")
+          sleep(wait_interval)
           @push_manager.stop_sse
           @synchronizer.sync_all
           @push_manager.start_sse
@@ -155,6 +159,7 @@ def incoming_push_status_handler
 
           case status
           when Constants::PUSH_CONNECTED
+            @back_off.reset
             process_connected
           when Constants::PUSH_RETRYABLE_ERROR
             process_disconnect(true)