database.py

import mysql.connector
from get_docker_secret import get_docker_secret
import os
import random

# Exception thrown when no password has been defined to connect to the database
class NoPasswordDefineError(Exception):
    """No secret containing a password has been found"""
    pass


__rdos_password__ = None

# Procedures that returns an externally defined password to conect to the database
# First tries to check the docker secrets, then an environment variable.
# Throws NoPasswordDefineError if no password is found
# Returns a password 
def get_password():
    if __rdos_password__ == None:
        password = get_docker_secret('rdos_secret')
        if password == None:
            if 'rdos_secret' in os.environ:
                password = os.environ['rdos_secret']
                print("Password stored in a non secured way, please make your code safer")
            else:
                raise NoPasswordDefineError
        return password
    return __rdos_password__


# Connect to the local MYSQL database on lipn-rdos
def database_connection():
    mydb = mysql.connector.connect(
        host="192.168.90.101",
        user="rdos",
        password = get_password(),
        database="rdos"
    )
    return mydb


def update_database(url:str, job_id: str, before:str, after:str):
    database = database_connection()
    mycursor = database.cursor(buffered=False)

    with open('../database/templates/update_success.txt', 'r') as file:
        update = file.read()
    update = update.replace('{{before}}', before).replace('{{after}}', after)
    update = update.replace('{{url}}', url)
    update = update.replace('{{job_id}}', job_id)
    print(update)

    mycursor.execute(update)
    database.commit()
    print(mycursor.rowcount, "record(s) affected")
    return mycursor.rowcount


# Get a row in the Job table that hasn't been computed yet.
def get_job(database):
    sql_get_new_job = "SELECT jobs.id,parametersJSON,directory,email,tool,jobs.idGenerator,outputFormat,command from jobs inner join generators on jobs.idGenerator=generators.id where status='10'"
    mycursor = database.cursor(buffered=True)
    mycursor.execute(sql_get_new_job)
    
    myresult = mycursor.fetchone()

    mycursor.close()
    return myresult


# Tells the database that the previously selected job will be taken care of by the deamon
# Returns 1 if no other deamon selected the job first, 0 otherwwise.
def apply_for_job(database, job_id: str):
    mycursor = database.cursor(buffered=False)
    update = "UPDATE jobs set status='100' where jobs.id='"+job_id+"' and status='10'" 
    mycursor.execute(update)
    database.commit()
    return mycursor.rowcount


# Returns a dictionary containing each generator's parameters as a key. The value associated to each key is "is this parameter's value written in the comand line or in a separated file
# in which case the value is the filename.
def getParameters(generators: dict):
    database = database_connection()
    parameters_basefile = {}
    parameters_default = {}
    for generator in generators:
        parameters_basefile[generator] = {}
        parameters_default[generator] = {}
        sql_get_new_job = "SELECT name,basefile,defaultValue from parameters inner join generators on parameters.idGenerator=generators.id where generators.tool = '"+generator+"'"
        mycursor = database.cursor(buffered=False)
        mycursor.execute(sql_get_new_job)    
        myresult = mycursor.fetchall()
        mycursor.close()
        
        for result in myresult:
            parameters_basefile[generator][result[0]] = result[1]
            parameters_default[generator][result[0]] = result[1]

    database.disconnect()
    return (parameters_basefile, parameters_default)


# Returns a dictionary containing all database generators existing in database
# The result returned contains every generators in database with parameters and default values for each field
def get_generators():
    database = database_connection()
    generators = {}
    sql_get_new_job = "SELECT generators.tool, name, basefile, defaultValue from parameters inner join generators on parameters.idGenerator=generators.id"
    mycursor = database.cursor(buffered=False)
è    mycursor.execute(sql_get_new_job)
    myresult = mycursor.fetchall()
    mycursor.close()
    for result in myresult:
        generators[result[0]] = [result]


# Insert in database a query send from client and returns insert status
def db_insert(query: dict):
    if(query is not None):
        database = database_connection()
        if(db_job_check(query) != 0):
            query['id'] = str(random.getrandbits(64))
        try:
            values = query.values()
            cols = query.keys()
            sql_new_job_row = "INSERT INTO jobs (%s) VALUES ('%s');" % (", ".join(cols), "','".join(values))
            mycursor = database.cursor(buffered=True)
            mycursor.execute(sql_new_job_row)
            print("Records inserted in DB :", query.values())
            database.commit()
            mycursor.close()
        except mysql.connector.Error as err:
            print("MYSQL Error :{}".format(err))


def db_job_check(query: dict):
    if (query is not None):
        db = database_connection()
        try:
            ret = 0
            val = query['id']
            sql_new_job_row = "SELECT * FROM jobs WHERE ID=('%s') LIMIT 1;" % (val)
            mycursor = db.cursor(buffered=True)
            mycursor.execute(sql_new_job_row)
            db.commit()
            ret = mycursor.rowcount
            mycursor.close()
            return ret
        except mysql.connector.Error as err:
            print("MYSQL Error :{}".format(err))