Reader configuration module based on a JSON file.

config.py

@@ -0,0 +1,96 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+'''
+    Copyright (C) 2016 Entr'ouvert
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Affero General Public License as
+    published by the Free Software Foundation, either version 3 of the
+    License, or (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Affero General Public License for more details.
+
+    You should have received a copy of the GNU Affero General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+'''
+
+
+import os
+import json
+import logging
+
+
+DEFAULT_CONFIG = {
+    # Reader general configuration
+    'temperature': True,                # Analyse and record temperature from reading
+    'heartrate': True,                  # Analyse and record heartrate from reading
+    'reader_sleep_short': 0.1,          # Sleep between inventory of detection
+    'reader_sleep_long': 5,             # Sleep before a long inventory
+
+    # Flags to run veadista reading
+    'exit_reader': False,               # Exit reading function
+    'pause_reader': False,              # Suspend reading
+
+    # Info produced by reading
+    'reader_ready': False,              # Flag set when the RFID reader is ready
+    'antenna_connected': [],            # List antennas connected
+    'tag_in_field': '',                 # The last antenna the tag was detected
+
+    # Transmitter general configuration
+    'metrics_path': 'entrouvert.research.veadista.patients.monitoring',
+    'transmitter_sleep': 1,
+    'patient_id': 1,
+    'carbon_hostname': '127.0.0.1',
+    'carbon_port': 2003,
+
+    # Flags to act during veadista sending
+    'exit_transmitter': True,
+    'transmitter_status': True,
+}
+
+
+logger = logging.getLogger(__name__)
+
+
+class Config:
+    def __init__(self):
+        if not os.path.isfile('config.json'):
+            logger.debug("Create configuration file '{}'.".format(DEFAULT_CONFIG))
+            self.set_config(DEFAULT_CONFIG)
+        else:
+            logger.debug('Existing configuration file.')
+            try:
+                with open('config.json', 'r') as f:
+                    json.loads(f.read())
+            except ValueError:
+                logger.warning("Corrupted configuration file, reinit with default configuration '{}'.".format(DEFAULT_CONFIG))
+                self.set_config(DEFAULT_CONFIG)
+
+    def set_config(self, config):
+        with open('config.json', 'w') as f:
+            f.write(json.dumps(config, sort_keys=True,
+                    indent=4, separators=(',', ': ')))
+
+    def get_config(self):
+        with open('config.json', 'r') as f:
+            return json.loads(f.read())
+
+    def set_setting(self, key, value):
+        config = self.get_config()
+        config[key] = value
+        self.set_config(config)
+
+    def get_setting(self, key):
+        config = self.get_config()
+        return config.get(key)
+
+    def reader_config(self):
+        config = self.get_config()
+        return (config.get('exit_reader'),
+                config.get('pause_reader'),
+                config.get('reader_sleep_short'),
+                config.get('temperature'),
+                config.get('heartrate'))