Implement history reading API

Dockerfile

@@ -60,7 +60,9 @@ ENV PYTHONPATH="/usr/local/lib/"                                           \
     TFW_LIB_DIR="/usr/local/lib/"                                          \
     TFW_CONTROLLER_DIR="/srv/controller"                                   \
     TFW_TERMINADO_DIR="/tmp/terminado_server"                              \
-    TFW_FRONTEND_DIR="/srv/frontend"
+    TFW_FRONTEND_DIR="/srv/frontend"                                       \
+    TFW_HISTFILE="/home/${AVATAO_USER}/.bash_history"                      \
+    PROMPT_COMMAND="history -a"
 
 COPY nginx/nginx.conf ${TFW_NGINX_CONF}
 COPY nginx/components/ ${TFW_NGINX_COMPONENTS}

lib/tfw/components/terminado_event_handler.py

@@ -1,4 +1,5 @@
 from tfw.components.terminado_mini_server import TerminadoMiniServer
+from tfw.components.history_monitor import HistoryMonitor
 from tfw.event_handler_base import TriggerlessEventHandler
 from tfw.config import tfwenv
 from tfw.config.logs import logging
@@ -9,14 +10,22 @@ class TerminadoEventHandler(TriggerlessEventHandler):
     def __init__(self, key):
         super().__init__(key)
         self.working_directory = tfwenv.TERMINADO_DIR
+        self.monitor = HistoryMonitor(tfwenv.HISTFILE)
         self.terminado_server = TerminadoMiniServer('/terminal', tfwenv.TERMINADO_PORT, tfwenv.TERMINADO_WD, ['bash'])
-        self.commands = {'write': self.write}
+        self.commands = {'write': self.write,
+                         'read': self.read}
+        self.monitor.watch()
         self.terminado_server.listen()
 
     def handle_event(self, key, data_json):
         log.debug('TerminadoEventHandler received event: {}'.format(data_json))
         data = data_json['data']
-        self.commands[data['command']](data)
+        data_json['data'] = self.commands[data['command']](data)
+        return data_json
 
     def write(self, data):
         self.terminado_server.pty.write(data['shellcmd'])
+
+    def read(self, data):
+        data['history'] = self.monitor.history[-int(data.get('count', 1)):]
+        return data