myems-api/core/gateway.py
import uuid
from datetime import datetime, timezone, timedelta
import falcon
import mysql.connector
import simplejson as json
from core.useractivity import user_logger, admin_control
import config
class GatewayCollection:
def __init__(self):
""""Initializes GatewayCollection"""
pass
@staticmethod
def on_options(req, resp):
resp.status = falcon.HTTP_200
@staticmethod
def on_get(req, resp):
admin_control(req)
cnx = mysql.connector.connect(**config.myems_system_db)
cursor = cnx.cursor()
query = (" SELECT id, name, uuid, token, last_seen_datetime_utc, description "
" FROM tbl_gateways "
" ORDER BY id ")
cursor.execute(query)
rows = cursor.fetchall()
cursor.close()
cnx.close()
timezone_offset = int(config.utc_offset[1:3]) * 60 + int(config.utc_offset[4:6])
if config.utc_offset[0] == '-':
timezone_offset = -timezone_offset
result = list()
if rows is not None and len(rows) > 0:
for row in rows:
if isinstance(row[4], datetime):
last_seen_datetime_local = row[4].replace(tzinfo=timezone.utc) + \
timedelta(minutes=timezone_offset)
last_seen_datetime = last_seen_datetime_local.strftime('%Y-%m-%dT%H:%M:%S')
else:
last_seen_datetime = None
meta_result = {"id": row[0],
"name": row[1],
"uuid": row[2],
"token": row[3],
"last_seen_datetime": last_seen_datetime,
"description": row[5]
}
result.append(meta_result)
resp.text = json.dumps(result)
@staticmethod
@user_logger
def on_post(req, resp):
"""Handles POST requests"""
admin_control(req)
try:
raw_json = req.stream.read().decode('utf-8')
except Exception as ex:
raise falcon.HTTPError(status=falcon.HTTP_400,
title='API.BAD_REQUEST',
description='API.FAILED_TO_READ_REQUEST_STREAM')
new_values = json.loads(raw_json)
if 'name' not in new_values['data'].keys() or \
not isinstance(new_values['data']['name'], str) or \
len(str.strip(new_values['data']['name'])) == 0:
raise falcon.HTTPError(status=falcon.HTTP_400, title='API.BAD_REQUEST',
description='API.INVALID_GATEWAY_NAME')
name = str.strip(new_values['data']['name'])
if 'description' in new_values['data'].keys() and \
new_values['data']['description'] is not None and \
len(str(new_values['data']['description'])) > 0:
description = str.strip(new_values['data']['description'])
else:
description = None
cnx = mysql.connector.connect(**config.myems_system_db)
cursor = cnx.cursor()
cursor.execute(" SELECT name "
" FROM tbl_gateways "
" WHERE name = %s ", (name,))
if cursor.fetchone() is not None:
cursor.close()
cnx.close()
raise falcon.HTTPError(status=falcon.HTTP_400, title='API.BAD_REQUEST',
description='API.GATEWAY_NAME_IS_ALREADY_IN_USE')
add_values = (" INSERT INTO tbl_gateways (name, uuid, token, description) "
" VALUES (%s, %s, %s, %s) ")
cursor.execute(add_values, (name,
str(uuid.uuid4()),
str(uuid.uuid4()),
description))
new_id = cursor.lastrowid
cnx.commit()
cursor.close()
cnx.close()
resp.status = falcon.HTTP_201
resp.location = '/gateways/' + str(new_id)
class GatewayItem:
def __init__(self):
""""Initializes GatewayItem"""
pass
@staticmethod
def on_options(req, resp, id_):
resp.status = falcon.HTTP_200
@staticmethod
def on_get(req, resp, id_):
admin_control(req)
if not id_.isdigit() or int(id_) <= 0:
raise falcon.HTTPError(status=falcon.HTTP_400, title='API.BAD_REQUEST',
description='API.INVALID_GATEWAY_ID')
cnx = mysql.connector.connect(**config.myems_system_db)
cursor = cnx.cursor()
query = (" SELECT id, name, uuid, token, last_seen_datetime_utc, description "
" FROM tbl_gateways "
" WHERE id = %s ")
cursor.execute(query, (id_,))
row = cursor.fetchone()
cursor.close()
cnx.close()
if row is None:
raise falcon.HTTPError(status=falcon.HTTP_404, title='API.NOT_FOUND',
description='API.GATEWAY_NOT_FOUND')
timezone_offset = int(config.utc_offset[1:3]) * 60 + int(config.utc_offset[4:6])
if config.utc_offset[0] == '-':
timezone_offset = -timezone_offset
if isinstance(row[4], datetime):
last_seen_datetime_local = row[4].replace(tzinfo=timezone.utc) + \
timedelta(minutes=timezone_offset)
last_seen_datetime = last_seen_datetime_local.strftime('%Y-%m-%dT%H:%M:%S')
else:
last_seen_datetime = None
result = {"id": row[0],
"name": row[1],
"uuid": row[2],
"token": row[3],
"last_seen_datetime": last_seen_datetime,
"description": row[5]}
resp.text = json.dumps(result)
@staticmethod
@user_logger
def on_delete(req, resp, id_):
admin_control(req)
if not id_.isdigit() or int(id_) <= 0:
raise falcon.HTTPError(status=falcon.HTTP_400, title='API.BAD_REQUEST',
description='API.INVALID_GATEWAY_ID')
cnx = mysql.connector.connect(**config.myems_system_db)
cursor = cnx.cursor()
cursor.execute(" SELECT name "
" FROM tbl_gateways "
" WHERE id = %s ", (id_,))
if cursor.fetchone() is None:
cursor.close()
cnx.close()
raise falcon.HTTPError(status=falcon.HTTP_404, title='API.NOT_FOUND',
description='API.GATEWAY_NOT_FOUND')
# check if this gateway is being used by any data sources
cursor.execute(" SELECT name "
" FROM tbl_data_sources "
" WHERE gateway_id = %s "
" LIMIT 1 ",
(id_,))
if cursor.fetchone() is not None:
cursor.close()
cnx.close()
raise falcon.HTTPError(status=falcon.HTTP_400,
title='API.BAD_REQUEST',
description='API.THERE_IS_RELATION_WITH_DATA_SOURCES')
cursor.execute(" DELETE FROM tbl_gateways WHERE id = %s ", (id_,))
cnx.commit()
cursor.close()
cnx.close()
resp.status = falcon.HTTP_204
@staticmethod
@user_logger
def on_put(req, resp, id_):
"""Handles PUT requests"""
admin_control(req)
try:
raw_json = req.stream.read().decode('utf-8')
except Exception as ex:
raise falcon.HTTPError(status=falcon.HTTP_400,
title='API.BAD_REQUEST',
description='API.FAILED_TO_READ_REQUEST_STREAM')
if not id_.isdigit() or int(id_) <= 0:
raise falcon.HTTPError(status=falcon.HTTP_400, title='API.BAD_REQUEST',
description='API.INVALID_GATEWAY_ID')
new_values = json.loads(raw_json)
if 'name' not in new_values['data'].keys() or \
not isinstance(new_values['data']['name'], str) or \
len(str.strip(new_values['data']['name'])) == 0:
raise falcon.HTTPError(status=falcon.HTTP_400, title='API.BAD_REQUEST',
description='API.INVALID_GATEWAY_NAME')
name = str.strip(new_values['data']['name'])
if 'description' in new_values['data'].keys() and \
new_values['data']['description'] is not None and \
len(str(new_values['data']['description'])) > 0:
description = str.strip(new_values['data']['description'])
else:
description = None
cnx = mysql.connector.connect(**config.myems_system_db)
cursor = cnx.cursor()
cursor.execute(" SELECT name "
" FROM tbl_gateways "
" WHERE id = %s ", (id_,))
if cursor.fetchone() is None:
cursor.close()
cnx.close()
raise falcon.HTTPError(status=falcon.HTTP_404, title='API.NOT_FOUND',
description='API.GATEWAY_NOT_FOUND')
cursor.execute(" SELECT name "
" FROM tbl_gateways "
" WHERE name = %s AND id != %s ", (name, id_))
if cursor.fetchone() is not None:
cursor.close()
cnx.close()
raise falcon.HTTPError(status=falcon.HTTP_400, title='API.BAD_REQUEST',
description='API.GATEWAY_NAME_IS_ALREADY_IN_USE')
update_row = (" UPDATE tbl_gateways "
" SET name = %s, description = %s "
" WHERE id = %s ")
cursor.execute(update_row, (name,
description,
id_,))
cnx.commit()
cursor.close()
cnx.close()
resp.status = falcon.HTTP_200
class GatewayDataSourceCollection:
def __init__(self):
""""Initializes GatewayDataSourceCollection"""
pass
@staticmethod
def on_options(req, resp):
resp.status = falcon.HTTP_200
@staticmethod
def on_get(req, resp, id_):
admin_control(req)
if not id_.isdigit() or int(id_) <= 0:
raise falcon.HTTPError(status=falcon.HTTP_400, title='API.BAD_REQUEST',
description='API.INVALID_GATEWAY_ID')
cnx = mysql.connector.connect(**config.myems_system_db)
cursor = cnx.cursor()
cursor.execute(" SELECT name "
" FROM tbl_gateways "
" WHERE id = %s ", (id_,))
if cursor.fetchone() is None:
cursor.close()
cnx.close()
raise falcon.HTTPError(status=falcon.HTTP_404, title='API.NOT_FOUND',
description='API.GATEWAY_NOT_FOUND')
timezone_offset = int(config.utc_offset[1:3]) * 60 + int(config.utc_offset[4:6])
if config.utc_offset[0] == '-':
timezone_offset = -timezone_offset
result = list()
query_data_source = (" SELECT id, name, uuid, "
" protocol, connection, last_seen_datetime_utc, description "
" FROM tbl_data_sources "
" WHERE gateway_id = %s "
" ORDER BY name ")
cursor.execute(query_data_source, (id_,))
rows_data_source = cursor.fetchall()
if rows_data_source is not None and len(rows_data_source) > 0:
for row in rows_data_source:
if isinstance(row[5], datetime):
last_seen_datetime_local = row[5].replace(tzinfo=timezone.utc) + \
timedelta(minutes=timezone_offset)
last_seen_datetime = last_seen_datetime_local.strftime('%Y-%m-%dT%H:%M:%S')
else:
last_seen_datetime = None
meta_result = {"id": row[0],
"name": row[1],
"uuid": row[2],
"protocol": row[3],
"connection": row[4],
"last_seen_datetime": last_seen_datetime,
"description": row[6]
}
result.append(meta_result)
cursor.close()
cnx.close()
resp.text = json.dumps(result)
class GatewayExport:
def __init__(self):
""""Initializes GatewayExport"""
pass
@staticmethod
def on_options(req, resp, id_):
resp.status = falcon.HTTP_200
@staticmethod
def on_get(req, resp, id_):
admin_control(req)
if not id_.isdigit() or int(id_) <= 0:
raise falcon.HTTPError(status=falcon.HTTP_400, title='API.BAD_REQUEST',
description='API.INVALID_GATEWAY_ID')
cnx = mysql.connector.connect(**config.myems_system_db)
cursor = cnx.cursor()
query = (" SELECT id, name, uuid, token, last_seen_datetime_utc, description "
" FROM tbl_gateways "
" WHERE id = %s ")
cursor.execute(query, (id_,))
row = cursor.fetchone()
cursor.close()
cnx.close()
if row is None:
raise falcon.HTTPError(status=falcon.HTTP_404, title='API.NOT_FOUND',
description='API.GATEWAY_NOT_FOUND')
timezone_offset = int(config.utc_offset[1:3]) * 60 + int(config.utc_offset[4:6])
if config.utc_offset[0] == '-':
timezone_offset = -timezone_offset
if isinstance(row[4], datetime):
last_seen_datetime_local = row[4].replace(tzinfo=timezone.utc) + \
timedelta(minutes=timezone_offset)
last_seen_datetime = last_seen_datetime_local.strftime('%Y-%m-%dT%H:%M:%S')
else:
last_seen_datetime = None
result = {"id": row[0],
"name": row[1],
"uuid": row[2],
"token": row[3],
"last_seen_datetime": last_seen_datetime,
"description": row[5]}
resp.text = json.dumps(result)
class GatewayImport:
def __init__(self):
""""Initializes GatewayImport"""
pass
@staticmethod
def on_options(req, resp):
resp.status = falcon.HTTP_200
@staticmethod
@user_logger
def on_post(req, resp):
"""Handles POST requests"""
admin_control(req)
try:
raw_json = req.stream.read().decode('utf-8')
except Exception as ex:
raise falcon.HTTPError(status=falcon.HTTP_400,
title='API.BAD_REQUEST',
description='API.FAILED_TO_READ_REQUEST_STREAM')
new_values = json.loads(raw_json)
if 'name' not in new_values.keys() or \
not isinstance(new_values['name'], str) or \
len(str.strip(new_values['name'])) == 0:
raise falcon.HTTPError(status=falcon.HTTP_400, title='API.BAD_REQUEST',
description='API.INVALID_GATEWAY_NAME')
name = str.strip(new_values['name'])
if 'description' in new_values.keys() and \
new_values['description'] is not None and \
len(str(new_values['description'])) > 0:
description = str.strip(new_values['description'])
else:
description = None
cnx = mysql.connector.connect(**config.myems_system_db)
cursor = cnx.cursor()
cursor.execute(" SELECT name "
" FROM tbl_gateways "
" WHERE name = %s ", (name,))
if cursor.fetchone() is not None:
cursor.close()
cnx.close()
raise falcon.HTTPError(status=falcon.HTTP_400, title='API.BAD_REQUEST',
description='API.GATEWAY_NAME_IS_ALREADY_IN_USE')
add_values = (" INSERT INTO tbl_gateways (name, uuid, token, description) "
" VALUES (%s, %s, %s, %s) ")
cursor.execute(add_values, (name,
str(uuid.uuid4()),
str(uuid.uuid4()),
description))
new_id = cursor.lastrowid
cnx.commit()
cursor.close()
cnx.close()
resp.status = falcon.HTTP_201
resp.location = '/gateways/' + str(new_id)
class GatewayClone:
def __init__(self):
""""Initializes GatewayClone"""
pass
@staticmethod
def on_options(req, resp, id_):
resp.status = falcon.HTTP_200
@staticmethod
@user_logger
def on_post(req, resp, id_):
admin_control(req)
if not id_.isdigit() or int(id_) <= 0:
raise falcon.HTTPError(status=falcon.HTTP_400, title='API.BAD_REQUEST',
description='API.INVALID_GATEWAY_ID')
cnx = mysql.connector.connect(**config.myems_system_db)
cursor = cnx.cursor()
query = (" SELECT id, name, uuid, token, last_seen_datetime_utc, description "
" FROM tbl_gateways "
" WHERE id = %s ")
cursor.execute(query, (id_,))
row = cursor.fetchone()
if row is None:
raise falcon.HTTPError(status=falcon.HTTP_404, title='API.NOT_FOUND',
description='API.GATEWAY_NOT_FOUND')
timezone_offset = int(config.utc_offset[1:3]) * 60 + int(config.utc_offset[4:6])
if config.utc_offset[0] == '-':
timezone_offset = -timezone_offset
if isinstance(row[4], datetime):
last_seen_datetime_local = row[4].replace(tzinfo=timezone.utc) + \
timedelta(minutes=timezone_offset)
last_seen_datetime = last_seen_datetime_local.strftime('%Y-%m-%dT%H:%M:%S')
else:
last_seen_datetime = None
result = {"id": row[0],
"name": row[1],
"uuid": row[2],
"token": row[3],
"last_seen_datetime": last_seen_datetime,
"description": row[5]}
new_name = (str.strip(result['name'])
+ (datetime.now()
+ timedelta(minutes=timezone_offset)).isoformat(sep='-', timespec='seconds'))
add_values = (" INSERT INTO tbl_gateways (name, uuid, token, description) "
" VALUES (%s, %s, %s, %s) ")
cursor.execute(add_values, (new_name,
str(uuid.uuid4()),
str(uuid.uuid4()),
result['description']))
new_id = cursor.lastrowid
cnx.commit()
cursor.close()
cnx.close()
resp.status = falcon.HTTP_201
resp.location = '/gateways/' + str(new_id)