python/CsvLoader.py

#!/usr/bin/python3

import sys
import os
import pika
import logging
import csv
import re
import mariadb
import shutil

from asebat.timefmt import timestamp_fmt as ts
from asebat.timefmt import date_refmt as df
from asebat.config import set_config as setting


class sqlraw():
    def __init__(self, cfg):
        self.config = {
            'host': cfg.dbhost,
            'user': cfg.dbuser,
            'password': cfg.dbpass
        }
        self.dbname = cfg.dbname
        self.table  = cfg.table
        self.sql_head = (
            "INSERT IGNORE INTO " + self.dbname + "." + self.table +
            " (`UnitName`,`ToolName`,`eventDT`,`BatteryLevel`,`Temperature`,`NodeNum`,"
            + "`Val0`,`Val1`,`Val2`,`Val3`,`Val4`,`Val5`,`Val6`,`Val7`," +
            "`Val8`,`Val9`,`ValA`,`ValB`,`ValC`,`ValD`,`ValE`,`ValF`) VALUES ")

    def add_data(self, values):
        self.sql = self.sql_head + '(' + '),('.join(values) + ');'

    def write_db(self):
        try:
            conn = mariadb.connect(**self.config, database=self.dbname)
        except mariadb.Error as err:
            logging.error("PID {:>5} >> Error to connet to DB {} - System error {}.".format(
                os.getpid(), self.dbname, err))
            sys.exit(1)

        cur = conn.cursor()
        try:
            cur.execute(self.sql)
        except mariadb.ProgrammingError as err:
            logging.error("PID {:>5} >> Error write into DB {} - System error {}.".format(
                os.getpid(), self.dbname, err))
            print(err)
            sys.exit(1)
        
        finally:
            conn.close()


def callback_ase(ch, method, properties, body, config):  #body è di tipo byte
    logging.info("PID {0:>5} >> Read message {1}".format(os.getpid(), body.decode("utf-8")))
    msg = body.decode("utf-8").split(";")
    sql = sqlraw(config)
    stmlst = []
    commonData = '"{0}","{1}"'.format(msg[1],msg[2])
    tooltype = msg[3]
    with open(msg[6], "r") as csvfile:
        lines = csvfile.read().splitlines()
        for line in lines:

            fields = line.split(";|;")

            if (mG501 := re.match(
                    r"^(\d\d\d\d\/\d\d\/\d\d\s\d\d:\d\d:\d\d);(.+);(.+)$",
                    fields[0]
                )):
                rowData = ',"{0}",{1},{2}'.format(mG501.group(1), mG501.group(2), mG501.group(3))
                fields.pop(0)

            elif (mG201 := re.match(
                    r"^(\d\d\/\d\d\/\d\d\d\d\s\d\d:\d\d:\d\d)$",
                    fields[0]
                )):
                mbtG201 = re.match(
                    r"^(.+);(.+)$",
                    fields[1]
                )

                rowData = ',"{0}",{1},{2}'.format(df.dateTimeFmt(mG201.group(1)), mbtG201.group(1), mbtG201.group(2))
                fields.pop(0)
                fields.pop(0)
            
            else:
                continue

            nodeNum = 0
            for field in fields:
                nodeNum += 1
                vals = field.split(";")
                stmlst.append(commonData + rowData + ',{0},'.format(nodeNum) + ','.join('"{0}"'.format(d) for d in vals) + ',' + ','.join(['null']*(config.valueNum-len(vals))))

            if  (config.maxInsertRow < len(stmlst)):
                sql.add_data(stmlst)
                try:
                    sql.write_db()
                    stmlst.clear()
                except:
                    print("errore nell'inserimento")
                    sys.exit(1)

        if len(stmlst) > 0:
            sql.add_data(stmlst)
            try:
                sql.write_db()
                ch.basic_ack(delivery_tag=method.delivery_tag)
            except:
                print("errore nell'inserimento")
                sys.exit(1)
    newFilename = msg[6].replace("received", "loaded")
    newPath, filenameExt = os.path.split(newFilename)
    try:
        os.makedirs(newPath)
        logging.info("PID {:>5} >> path {} created.".format(
            os.getpid(), newPath))
    except FileExistsError:
        logging.info("PID {:>5} >> path {} already exists.".format(
            os.getpid(), newPath))
    try:
        shutil.move(msg[6], newFilename)
        logging.info("PID {:>5} >> {} moved into {}.".format(
            os.getpid(), filenameExt, newFilename))
    except OSError:
        logging.error("PID {:>5} >> Error to move {} into {}.".format(
            os.getpid(), filenameExt, newFilename))


def main():
    cfg = setting.config()

    logging.basicConfig(
        format="%(asctime)s %(message)s",
        filename="/var/log/" + cfg.elablog,
        level=logging.INFO,
    )

    parameters = pika.URLParameters('amqp://' + cfg.mquser + ':' + cfg.mqpass +
                                    '@' + cfg.mqhost + ':' + cfg.mqport +'/%2F')
    connection = pika.BlockingConnection(parameters)
    channel = connection.channel()
    channel.queue_declare(queue=cfg.csv_queue, durable=True)

    channel.basic_qos(prefetch_count=1)
    channel.basic_consume(
        queue=cfg.csv_queue,
        on_message_callback=lambda ch, method, properties, body: callback_ase(ch, method, properties, body, config=cfg)
    )

    #channel.basic_consume(queue=cfg.csv_queue, on_message_callback=callback,arguments=cfg)
    try:
        channel.start_consuming()
    except KeyboardInterrupt:
        logging.info("PID {0:>5} >> Info: {1}.".format(
            os.getpid(), "Shutdown requested...exiting"))


if __name__ == "__main__":
    main()