Write process logs to console with a separate handler

tfw/components/frontend/__init__.py

@@ -1,2 +1,3 @@
 from .frontend_proxy_handler import FrontendProxyHandler
+from .console_logs_handler import ConsoleLogsHandler
 from .message_sender import MessageSender

tfw/components/frontend/console_logs_handler.py

@@ -0,0 +1,19 @@
+import logging
+
+LOG = logging.getLogger(__name__)
+
+
+class ConsoleLogsHandler:
+    keys = ['process.log.new']
+
+    def __init__(self, *, stream):
+        self.stream = stream
+
+    def handle_event(self, message, connector):
+        try:
+            connector.send_message({
+                'key': 'console.write',
+                'value': message[self.stream]
+            })
+        except KeyError:
+            LOG.error('Invalid %s message received: %s', self.keys, message)