logger.py 12.7 KB
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#-------------------------------------------------------------------------------
# Author: Nelso G. Jost (nelsojost@gmail.com)
# License: GPL
# Purpose: Get data from the board via serial and send it to the server.
#-------------------------------------------------------------------------------
from __future__ import print_function, division

from datetime import datetime
from pprint import pprint

import logging
import os
import requests
import subprocess
import serial
import sys
import time
import json
import yaml
import jinja2

SETTINGS_YAML_SCHEMA =\
"""
SERVER:
    API_POST_URL: str

LOGGER:
    READING_INTERVAL: {seconds: int, minutes: int, hours: int, days: int}
    DATETIME_FORMAT: str

SENSORS:
    - {nickname: str, data_format: str}

ARDUINO:
    SERIAL_PORT: str
    BAUD_RATE: int

FILES:
    DATALOG_CSV: str
    DATALOG_CSV_SEP: str
    SERVER_OUTGOING_JSON: str
"""

def make_current_file_path(filename):
    ''' Append filename to the current __file__ path. '''
    return os.path.join(os.path.abspath(os.path.dirname(__file__)), filename)

class Meteorologger:
    '''
    Provides a series of mechanisms to collect sensor data from the board
    via serial port, save locally on the machine and upload to the server.

    The functionality of this class relies heavily on the config file given
    by the SETTINGS_FILENAME attribute, which uses YAML syntax.

    Call the run() method to start the logging process.
    '''
    EXECUTION_LOG_FILENAME = 'logs/execution.log'
    SETTINGS_FILENAME = 'settings.yaml'

    CSV_SEP = ','
    DATA_FORMATS = {'int': int, 'float': float, 'str': str}

    SERIAL_READ_TIMEOUT = 1.5  # seconds
    FIND_PORT_TIMEOUT = 10     # seconds
    BOARD_RESET_TIMEOUT = 2    # seconds

    verbose = True

    def __init__(self, verbose=False):
        self.verbose = verbose
        self.load_settings()

    def _decode_bytes(self, raw_bytes, encoding='ascii'):
        result = None
        try:
            result = raw_bytes.decode(encoding).strip()
        except:
            if self.verbose:
                print("Invalid bytes!")
        return result

    def _getCFG(self, *args, expected_type=None):
        r = self.CFG
        for key in args:
            try:
                r = r[key]
            except:
                raise Exception("Configuration file '{}' is missing the "
                                "required key\n    {}"
                                .format(self.SETTINGS_FILENAME,
                                        ': '.join(args)))
        if expected_type is not None:
            try:
                return expected_type(r)
            except:
                raise TypeError("Expected type {} on key {}".format(
                                expected_type, ':'.join(args)))
        return r

    def load_settings(self):
        '''
        Load the configuration file onto the self.CFG attribute.
        Some keys will be tested and filenames will be normalized.
        '''
        with open(self.SETTINGS_FILENAME) as f:
            self.CFG = yaml.safe_load(f)

        self.API_POST_URL = self._getCFG('SERVER', 'API_POST_URL',
                                          expected_type=str)

        self.SENSORS_CSV_LINE = self.CSV_SEP.join(
            [d['nickname'] for d in self._getCFG('SENSORS',
                                                 expected_type=list)])

        self.DATALOG_CSV_FILENAME = self._getCFG(
            'FILES', 'DATALOG_CSV', expected_type=str)
        self.SERVER_OUTGOING_FILENAME = self._getCFG(
            'FILES', 'SERVER_OUTGOING_JSON', expected_type=str)

        # convert raw str into normal escaped str (e.g., r'\\t' --> '\t')
        self.DATALOG_CSV_SEP = bytes(
            self._getCFG('FILES', 'DATALOG_CSV_SEP', expected_type=str),
            'utf8').decode('unicode_escape')

        self.SERIAL_PORTS = [p.strip() for p in
                             self._getCFG('ARDUINO', 'SERIAL_PORT',
                                          expected_type=str).split(',')]

        self.READING_INTERVAL_SECONDS =\
            self._getCFG('LOGGER', 'READING_INTERVAL', 'seconds',
                         expected_type=int) + \
            60 * self._getCFG('LOGGER', 'READING_INTERVAL', 'minutes',
                              expected_type=int) + \
            3600 * self._getCFG('LOGGER', 'READING_INTERVAL', 'hours',
                                expected_type=int) + \
            86400 * self._getCFG('LOGGER', 'READING_INTERVAL', 'days',
                                 expected_type=int)

        self.DATETIME_FORMAT = self._getCFG('LOGGER', 'DATETIME_FORMAT',
                                            expected_type=str)

    def create_json_data(self, raw_line):
        '''
        Given the raw serial line response (expected to be a CSV line), returns
        a JSON dict with sensor data including the datetime field.
        '''
        raw_sensor_data = {
            'datetime': datetime.now().strftime(self.DATETIME_FORMAT),
            'sensors': {}}

        for i, v in enumerate(raw_line.split(self.CSV_SEP)):
            v = v.strip()
            type_ = self.DATA_FORMATS[self.CFG['SENSORS'][i]['data_format']]
            nickname = self.CFG['SENSORS'][i]['nickname']
            try:
                v = type_(v)
            except:
                logging.error("Cannot convert value '{}' read from {} to {}"
                              .format(v, nickname, type_))
                continue

            raw_sensor_data['sensors'][nickname] = v

        logging.info("Resulting JSON: {}".format(raw_sensor_data))

        return raw_sensor_data

    def write_data_log(self, json_data):
        '''
        For backup purposes, write the given JSON data onto the file
        DATALOG_CSV as specficied on self.SETTINGS_FILENAME.
        '''
        csv_line = json_data['datetime'] + self.DATALOG_CSV_SEP
        for sensor in self.CFG['SENSORS']:
            if sensor['nickname'] in json_data['sensors']:
                csv_line += str(json_data['sensors']
                                        [sensor['nickname']])
            csv_line += self.DATALOG_CSV_SEP
        csv_line = csv_line[:-1]
        try:
            with open(self.CFG['FILES']['DATALOG_CSV'], 'a') as f:
                f.write(csv_line + '\n')
            logging.info("Done! CSV line '{}' was appended to the file '{}'"
                          .format(csv_line, self.CFG['FILES']['DATALOG_CSV']))
        except:
            logging.error("Unable to write data log at '{}'"
                          .format(self.CFG['FILES']['DATALOG_CSV']))

    def send_data_to_server(self, json_data):
        logging.info("URL: {}".format(self.API_POST_URL))
        r = None
        try:
            if os.path.exists(self.CFG['FILES']['SERVER_OUTGOING_JSON']):
                logging.info("Outgoing data exists! Trying to send it first..")

                with open(self.CFG['FILES']['SERVER_OUTGOING_JSON']) as f:
                    for i, line in enumerate(f):
                        r = requests.post(self.API_POST_URL,
                                          json=json.loads(line,
                                                          encoding='utf-8'))
                        if r.status_code != 200:
                            raise Exception

                        logging.info('Line {}: {}'.format(i, r))
                os.remove(self.CFG['FILES']['SERVER_OUTGOING_JSON'])
                logging.info("Done! Server data should be up to date.")

            r = requests.post(self.API_POST_URL, json=json_data)
            if r.status_code != 200:
                raise Exception
            logging.info("Done! Request: {}".format(r))

        except:
            logging.error("Unable to reach the server.")
            logging.info("Response request: {}".format(r))

            logging.info("Attempting to write current data on local file '{}'"
                         .format(self.CFG['FILES']['SERVER_OUTGOING_JSON']))

            with open(self.CFG['FILES']['SERVER_OUTGOING_JSON'], 'a') as f:
                f.write(json.dumps(json_data) + '\n')

            logging.info("Done! Data is saved an will be shipped as soon as "
                         "the server is back on.")
            return

    def serial_read_sensors(self, port_index=None):
        '''
        Sends the 'csv_nickname_list' string to the serial port of index
        'port_index' (for self.SERIAL_PORTS) and returns the response line.

        csv_nickname_list example: str
            Example: 'DHT22_TEMP,DHT22_AH,BMP085_PRESSURE,LDR'
        '''
        result_line, ser = None, None
        try:
            if isinstance(port_index, int):
                serial_port = self.SERIAL_PORTS[port_index]
            else:
                serial_port = self.SERIAL_PORTS[0]

            # if present, the board will be reseted
            ser = serial.Serial(serial_port,
                                self._getCFG('ARDUINO', 'BAUD_RATE',
                                             expected_type=int),
                                timeout = self.SERIAL_READ_TIMEOUT,
                                xonxoff=True)
            logging.info(str(ser))

            time.sleep(self.BOARD_RESET_TIMEOUT)

            while bool(result_line) is False:

                result = ser.write(bytes(self.SENSORS_CSV_LINE, 'utf8'))

                logging.info("sent: '{}' ({} bytes)".format(
                             self.SENSORS_CSV_LINE, result))

                result_line = ser.readline()

                logging.info("read: {} ({} bytes)".format(result_line,
                                                          len(result_line)))

                result_line = self._decode_bytes(result_line)
                if result_line is None:
                    logging.error("Unable to decode line as ASCII.")
                    logging.info("Trying a new reading..")
                    continue

            ser.close()
            return result_line
        except KeyboardInterrupt:
            raise KeyboardInterrupt
        except:
            logging.error("Unable to open serial port '{}'"
                          .format(serial_port))
        finally:
            if ser:
                ser.close()
                logging.info("serial closed")
        return None

    def setup_logging(self):
        logging.basicConfig(
            level=logging.DEBUG,
            filename=self.EXECUTION_LOG_FILENAME,
            format='%(asctime)s : %(levelname)s : %(message)s',
            datefmt='%Y-%m-%d %H:%M:%S')

        if self.verbose:
            root = logging.getLogger('')
            console = logging.StreamHandler()
            # console.setFormatter(logging.Formatter(
            #     fmt='%(asctime)s %(message)s', datefmt='%Y-%m-%d %H:%M:%S'))
            root.addHandler(console)

    def run(self):
        '''
        Starts the logger main loop, which iterate over the procedures:
            1. Read sensor data via serial port;
            2. If successful, save data on
        '''
        self.setup_logging()

        logging.info('='*40)
        logging.info('EXECUTION START')

        port_index = 0
        try:
            while True:
                logging.info('='*40)
                logging.info('Attempting to read from serial')
                csv_result = self.serial_read_sensors(port_index)

                if csv_result is not None:
                    logging.info("csv_result: '{}'".format(csv_result))

                    logging.info('-'*40)
                    logging.info('Attempting create valid JSON data')
                    json_data = self.create_json_data(csv_result)

                    logging.info('-'*40)
                    logging.info('Attempting to write local data log')
                    self.write_data_log(json_data)

                    logging.info('-'*40)
                    logging.info('Attempting to send data to the server')
                    self.send_data_to_server(json_data)
                else:
                    if port_index < len(self.SERIAL_PORTS) - 1:
                        port_index += 1
                    else:
                        port_index = 0

                    logging.info("Trying another port in about {} seconds.."
                                 .format(self.FIND_PORT_TIMEOUT))
                    time.sleep(self.FIND_PORT_TIMEOUT)
                    continue

                logging.info('-'*40)
                logging.info("Going to sleep now for {days} days, {hours} "
                             "hours, {minutes} minutes and {seconds} seconds.."
                             .format(**self.CFG['LOGGER']['READING_INTERVAL']))

                time.sleep(self.READING_INTERVAL_SECONDS)

        except KeyboardInterrupt:
            logging.info('KeyboardInterrupt: EXECUTION FINISHED')
            pass


if __name__ == '__main__':
    Meteorologger(verbose = True if '-v' in sys.argv else False).run()