def get_definitions(service: str) -> dict:
service_account_obj = service_account.Credentials.from_service_account_file(
os.environ['MYSQL_BIG_QUERY_GOOGLE_AUTH'])
storage = StorageAdapter(service_account_obj)
storage.get_client()
key = storage.get_file_as_string(bucket="mysql_sync_keys", file=service)
if key is False:
raise RuntimeError(storage.errors)
crypto = Fernet(key)
bqa = BigQueryAdapter(service_account_obj)
bqa.get_client()
query = f"SELECT * FROM mysql_sync.data_sources WHERE service = '{service}'"
result = bqa.query(query)
if result is False:
raise RuntimeError(bqa.errors)
definitions = {}
for item in result:
definitions['service'] = item['service']
definitions['data_set'] = item['data_set']
definitions['database'] = item['database']
definitions['host'] = crypto.decrypt(
bytes(item['host'], encoding='utf-8'))
definitions['user'] = crypto.decrypt(
bytes(item['user'], encoding='utf-8'))
definitions['password'] = crypto.decrypt(
bytes(item['password'], encoding='utf-8'))
return definitions
def test_create_table_runtime_error(mock_service_account):
bq = BigQueryAdapter(mock_service_account)
schema = [
bigquery.SchemaField("column1", "STRING", mode="REQUIRED"),
bigquery.SchemaField("column2", "INTEGER", mode="REQUIRED"),
]
with pytest.raises(RuntimeError):
bq.create_table(schema)
def set_last_run(self, service_name: str):
big_query_client = BigQueryAdapter(self.service_account)
big_query_client.get_client()
query = f"UPDATE mysql_sync.data_sources SET `last_run` = CURRENT_TIMESTAMP where `service`= '{service_name}'"
result = big_query_client.query(query)
if not result:
self.sd_logger.error(big_query_client.errors, {
'class': 'PrefectProduceSchemaJobs',
'method': 'set_last_run'
})
return result
def create_data_set(self, big_query_client: BigQueryAdapter) -> bool:
# return True if dataset already exists
if big_query_client.check_dataset(self.definitions['data_set']):
return True
big_query_client.set_data_set_ref(self.definitions['data_set'])
result = big_query_client.create_data_set()
if result:
self.sd_logger.info(
{'message': f"Created {self.definitions['data_set']} Data Set"},
{'class': 'PrefectAddServiceBigQuery', 'method': 'create_data_set'})
else:
self.sd_logger.warning(
big_query_client.errors,
{'class': 'PrefectAddServiceBigQuery', 'method': 'create_data_set'}
)
return result
def create_config_data_set(self,
big_query_client: BigQueryAdapter) -> bool:
# return True if dataset already exists
if big_query_client.check_dataset('mysql_sync'):
return True
big_query_client.set_data_set_ref('mysql_sync')
result = big_query_client.create_data_set()
if result:
self.sd_logger.info({'message': f"Created mysql_sync Data Set"}, {
'class': 'PrefectInstallBigQuery',
'method': 'create_data_set'
})
else:
self.sd_logger.warning(big_query_client.errors, {
'class': 'PrefectInstallBigQuery',
'method': 'create_data_set'
})
return result
def __init__(self, service: str, **kwargs):
self.service_account = service_account.Credentials.from_service_account_file(
os.environ['MYSQL_BIG_QUERY_GOOGLE_AUTH'])
self.definitions = service_helpers.get_definitions(service)
self.sd_logger = StackDriverAdapter(self.service_account)
self.sd_logger.get_client()
self.sd_logger.create_logger(f"{self.definitions['service']}-etl")
self.pub_sub_client = PubSubAdapter(self.service_account)
self.pub_sub_client.get_subscriber()
self.pub_sub_client.set_subscription(
f"{self.definitions['service']}-etl-schema")
self.big_query_client = BigQueryAdapter(self.service_account)
self.big_query_client.get_client()
self.big_query_client.set_data_set_ref(self.definitions['data_set'])
super().__init__(**kwargs)
def get_service_to_produce(self) -> str:
big_query_client = BigQueryAdapter(self.service_account)
big_query_client.get_client()
query = 'SELECT * from mysql_sync.data_sources order by `last_run` limit 1'
result = big_query_client.query(query)
if not result:
self.sd_logger.error(
big_query_client.errors, {
'class': 'PrefectProduceSchemaJobs',
'method': 'get_service_to_produce'
})
RuntimeError(big_query_client.errors)
for item in result:
if hasattr(item, 'service'):
return item.service
else:
raise RuntimeError(
'Service was not found in mysql_sync.data_sources')
def write_to_big_query(self, data: pd.DataFrame) -> bool:
bq = BigQueryAdapter(self.service_account)
bq.get_client()
bq.set_data_set_ref(self.definitions['data_set'])
bq.set_table_ref('sync_tracking_table')
result = bq.upload_data_frame(data, 'replace')
if result:
self.sd_logger.info(
{"Tracking table populated": data.count(axis=0).to_dict()}, {
'class': 'PopulateTrackingTable',
'method': 'write_to_big_query'
})
else:
self.sd_logger.error(bq.errors, {
'class': 'PopulateTrackingTable',
'method': 'write_to_big_query'
})
return result
def save_record(self):
record = {
'service': [self.service],
'data_set': [self.data_set],
'host': [self.host],
'user': [self.user],
'password': [self.password],
'database': [self.database]
}
df = pd.DataFrame(record)
big_query = BigQueryAdapter(self.service_account)
big_query.get_client()
big_query.set_data_set_ref('mysql_sync')
big_query.set_table_ref('data_sources')
result = big_query.upload_data_frame(df)
if result is False:
self.sd_logger.error(big_query.errors, {
'class': 'AddService',
'method': 'save_record'
})
def __init__(self, service: str, **kwargs):
self.table = None
self.watched_column = None
self.primary_id = None
self.sample_size = 1000
self.service_account = service_account.Credentials.from_service_account_file(
os.environ['MYSQL_BIG_QUERY_GOOGLE_AUTH'])
self.definitions = service_helpers.get_definitions(service)
self.sd_logger = StackDriverAdapter(self.service_account)
self.sd_logger.get_client()
self.sd_logger.create_logger(f"{self.definitions['service']}-etl")
self.pub_sub_client = PubSubAdapter(self.service_account)
self.pub_sub_client.get_subscriber()
self.pub_sub_client.set_subscription(
f"{self.definitions['service']}-etl")
self.big_query_client = BigQueryAdapter(self.service_account)
self.big_query_client.get_client()
self.big_query_client.set_data_set_ref(self.definitions['data_set'])
self.my_sql_client = MySqlAdapter()
super().__init__(**kwargs)
def get_items_to_be_queued(self, big_query_client: BigQueryAdapter):
query = [
"SELECT `table`, `watched`, `primary_id`",
f"FROM `{self.definitions['data_set']}`.`sync_tracking_table`",
"WHERE `synchronize` is true", "ORDER BY `table` ASC"
]
result = big_query_client.query(' '.join(query))
if not result:
self.sd_logger.error(
big_query_client.errors, {
'class': 'PrefectProduceSchemaJobs',
'method': 'get_items_to_be_queued'
})
return result
def create_config_table(self, big_query_client: BigQueryAdapter):
big_query_client.set_data_set_ref('mysql_sync')
big_query_client.set_table_ref('data_sources')
# return true if table already exists
if big_query_client.check_table():
return True
schema = [
bigquery.SchemaField('service',
'STRING',
description="Service Name"),
bigquery.SchemaField('data_set',
'STRING',
description="Big Query Data Set"),
bigquery.SchemaField('host',
'STRING',
description="MySQL host connection"),
bigquery.SchemaField('user',
'STRING',
description="MySQL connection user"),
bigquery.SchemaField('password',
'STRING',
description="MySQL connection password"),
bigquery.SchemaField('database',
'STRING',
description="MySQL Database"),
bigquery.SchemaField('last_run',
'TIMESTAMP',
description="Last produce date"),
]
result = big_query_client.create_table(schema)
if result:
self.sd_logger.info({'message': f"Created Config table"}, {
'class': 'PrefectInstallBigQuery',
'method': 'create_config_table'
})
else:
self.sd_logger.warning(big_query_client.errors, {
'class': 'PrefectInstallBigQuery',
'method': 'create_config_table'
})
return result
def create_tracking_table(self, big_query_client: BigQueryAdapter):
big_query_client.set_data_set_ref(self.definitions['data_set'])
big_query_client.set_table_ref('sync_tracking_table')
# return true if table already exists
if big_query_client.check_table():
return True
schema = [
bigquery.SchemaField(
'table',
'STRING',
description="Tracked Table Name"
),
bigquery.SchemaField(
'watched',
'STRING',
description="Column to watch to minimize the number of records loaded per sync"
),
bigquery.SchemaField(
'primary_id',
'STRING',
description="Primary Id Column(s)"
),
bigquery.SchemaField(
'synchronize',
'BOOLEAN',
description="Flag to Synchronize the table"
)
]
result = big_query_client.create_table(schema)
if result:
self.sd_logger.info(
{'message': f"Created tracking table"},
{'class': 'PrefectAddServiceBigQuery', 'method': 'create_tracking_table'}
)
else:
self.sd_logger.warning(
big_query_client.errors,
{'class': 'PrefectAddServiceBigQuery', 'method': 'create_tracking_table'}
)
return result
class Data(Task):
def __init__(self, service: str, **kwargs):
self.chunk_size = 250000
self.table = None
self.watched_column = None
self.service_account = service_account.Credentials.from_service_account_file(
os.environ['MYSQL_BIG_QUERY_GOOGLE_AUTH'])
self.definitions = service_helpers.get_definitions(service)
self.sd_logger = StackDriverAdapter(self.service_account)
self.sd_logger.get_client()
self.sd_logger.create_logger(f"{self.definitions['service']}-etl")
self.pub_sub_client = PubSubAdapter(self.service_account)
self.pub_sub_client.get_subscriber()
self.pub_sub_client.set_subscription(
f"{self.definitions['service']}-etl-data")
self.big_query_client = BigQueryAdapter(self.service_account)
self.big_query_client.get_client()
self.big_query_client.set_data_set_ref(self.definitions['data_set'])
self.my_sql_client = MySqlAdapter(service)
super().__init__(**kwargs)
def check_message(self, message):
if 'table' in message:
self.table = message['table']
else:
error_message = 'Table was not included in the message'
self.sd_logger.error({'error': error_message}, {
'class': 'Data',
'method': 'check_message',
'table': self.table
})
raise RuntimeError(error_message)
if 'watched' in message:
self.watched_column = message['watched']
else:
error_message = 'Watched was not included in the message'
self.sd_logger.error({'error': error_message}, {
'class': 'Data',
'method': 'check_message',
'table': self.table
})
raise RuntimeError(error_message)
def get_schema_from_big_query(self) -> bool:
self.big_query_client.set_table_ref(self.table)
table_check = self.big_query_client.check_table()
if table_check:
return self.big_query_client.get_schema()
return table_check
def last_updated_data(self) -> Union[str, bool]:
query = f"SELECT MAX({self.watched_column}) as last_updated FROM {self.definitions['data_set']}.{self.table}"
result = self.big_query_client.query(query)
if result:
for value in result:
if value['last_updated']:
return value['last_updated']
else:
# return none to allow all records to be pulled at the start
return None
else:
self.sd_logger.critical(
self.big_query_client.errors, {
'class': 'Data',
'method': 'last_updated_data',
'table': self.table
})
return result
def get_number_of_records_to_import(self,
last_updated) -> Union[int, bool]:
result = self.my_sql_client.count_items_to_sync(
table=self.table,
watched_column=self.watched_column,
last_run=last_updated)
if self.my_sql_client.errors:
self.sd_logger.critical(
self.my_sql_client.errors, {
'class': 'Data',
'method': 'get_number_of_records_to_import',
'table': self.table
})
return result
def query_mysql_for_records(self, last_updated_date: str, limit: int,
offset: int) -> Union[list, bool]:
results = self.my_sql_client.get_records(
table=self.table,
watched_column=self.watched_column,
last_run=last_updated_date,
limit=limit,
offset=offset)
if not results:
self.sd_logger.critical(
self.my_sql_client.errors, {
'class': 'Data',
'method': 'get_number_of_records_to_import',
'table': self.table
})
return results
def load_mysql_data_into_data_frame(
self, data: list, schema: dict) -> Union[DataFrame, bool]:
if len(data[0]) is not len(schema.keys()):
self.sd_logger.critical(
{
'message': "Schema and data length mismatch",
'schema_length': len(schema.keys()),
'data_length': len(data[0])
}, {
'class': 'Data',
'method': 'load_mysql_data_into_data_frame',
'table': self.table
})
return False
df = pd.DataFrame.from_records(data, columns=schema.keys())
del data
return df
def transform_data_frame_to_match_big_query_schema(
self, data_frame: DataFrame,
schema: dict) -> Union[DataFrame, bool]:
try:
df = service_helpers.data_frame_to_schema(data_frame, schema)
except ValueError as e:
self.sd_logger.critical({'message': 'Error: {}'.format(e)}, {
'class': 'Data',
'method': 'transform_data_frame_to_match_big_query_schema',
'table': self.table
})
return False
return df
def append_data_frame_to_big_query(self, data_frame: DataFrame):
result = self.big_query_client.upload_data_frame(data_frame)
if result:
message = f"table:{self.table} | Records written: {data_frame.shape[0]}"
self.sd_logger.info({'message': message}, {
'class': 'Data',
'method': 'append_data_frame_to_big_query',
'table': self.table
})
else:
self.sd_logger.critical(
self.big_query_client.errors, {
'class': 'Data',
'method': 'append_data_frame_to_big_query',
'table': self.table
})
return result
def write_df_to_storage(self, df: DataFrame) -> bool:
storage_client = StorageAdapter(self.service_account)
storage_client.get_client()
date_time_obj = datetime.datetime.utcnow()
location = f'error/csv/{self.table}/{date_time_obj.strftime("%m-%d-%Y_%H:%M:%S")}_UTC'
result = storage_client.write_string(
bucket=self.definitions['service'] + '-etl',
destination=location,
string=df.to_csv(),
encoding='text/csv')
if not result:
self.sd_logger.error(
storage_client.errors, {
'class': 'Data',
'method': 'write_df_to_storage',
'table': self.table
})
return False
self.sd_logger.info({'message': f"Failed CSV added to {location}"}, {
'class': 'Data',
'method': 'write_df_to_storage',
'table': self.table
})
return result
class Schema(Task):
def __init__(self, service: str, **kwargs):
self.service_account = service_account.Credentials.from_service_account_file(
os.environ['MYSQL_BIG_QUERY_GOOGLE_AUTH'])
self.definitions = service_helpers.get_definitions(service)
self.sd_logger = StackDriverAdapter(self.service_account)
self.sd_logger.get_client()
self.sd_logger.create_logger(f"{self.definitions['service']}-etl")
self.pub_sub_client = PubSubAdapter(self.service_account)
self.pub_sub_client.get_subscriber()
self.pub_sub_client.set_subscription(
f"{self.definitions['service']}-etl-schema")
self.big_query_client = BigQueryAdapter(self.service_account)
self.big_query_client.get_client()
self.big_query_client.set_data_set_ref(self.definitions['data_set'])
super().__init__(**kwargs)
def get_mysql_schema(self, table: str) -> Union[list, bool]:
mysql_client = MySqlAdapter(self.definitions['service'])
columns = mysql_client.mysql_table_definition(table)
if not columns:
self.sd_logger.error(mysql_client.errors, {
'class': 'Schema',
'method': 'get_mysql_schema',
'table': table
})
return False
return columns
@staticmethod
def organized_mysql_schema(schema: list) -> list:
organized_column_data = []
for column in schema:
organized_column_data.append(
service_helpers.label_mysql_table_definitions(column))
return organized_column_data
@staticmethod
def convert_mysql_to_big_query_schema(schema: list) -> list:
return service_helpers.generate_bq_schema_from_mysql(schema)
def store_mysql_schema(self, schema: list, table: str) -> bool:
encoded_schema = json.dumps(schema)
storage_client = StorageAdapter(self.service_account)
storage_client.get_client()
date_time_obj = datetime.utcnow()
result = storage_client.write_string(
bucket=self.definitions['service'] + '-etl',
destination=
f'schema/{table}/{date_time_obj.strftime("%m-%d-%Y_%H:%M:%S")}_UTC',
string=encoded_schema)
if not result:
self.sd_logger.error(storage_client.errors, {
'class': 'Schema',
'method': 'store_mysql_schema',
'table': table
})
return False
return result
def check_table_exists(self, table):
self.big_query_client.set_table_ref(table)
return self.big_query_client.check_table()
def get_current_schema(self, table: str):
self.big_query_client.set_table_ref(table)
return self.big_query_client.get_schema()
@staticmethod
def compare_schema(new_schema, current_schema) -> bool:
# first check is total number of items
if len(new_schema) is not len(current_schema):
return False
# compare column names and types
schema_matches = True
for x in range(len(new_schema)):
exists_in_current = False
if current_schema[x].name == new_schema[x].name:
if current_schema[x].field_type == new_schema[x].field_type:
exists_in_current = True
else:
exists_in_current = True
if not exists_in_current:
schema_matches = False
return schema_matches
def create_table(self, table: str, schema: list) -> bool:
self.big_query_client.set_table_ref(table)
result = self.big_query_client.create_table(schema=schema,
overwrite=True)
if result:
self.sd_logger.info({'message': f"Table {table} Created"}, {
'class': 'Schema',
'method': 'create_table',
'table': table
})
else:
self.sd_logger.error(self.big_query_client.errors, {
'class': 'Schema',
'method': 'create_table',
'table': table
})
return result
@staticmethod
def acknowledge_message(message):
message.ack()
def copy_bq_table(self, table: str):
self.big_query_client.set_table_ref(table)
copy_table_ref = self.big_query_client.table_ref
date_time_obj = datetime.utcnow()
destination_str = f'{table}_{date_time_obj.strftime("%m_%d_%Y")}'
self.big_query_client.set_table_ref(destination_str)
destination_table_ref = self.big_query_client.table_ref
result = self.big_query_client.copy_table(
copy_table=copy_table_ref, destination_table=destination_table_ref)
if result:
self.sd_logger.warning(
{'message': f"Table {table} copied to {destination_str}"}, {
'class': 'Schema',
'method': 'copy_bq_table',
'table': table
})
else:
self.sd_logger.error(self.big_query_client.errors, {
'class': 'Schema',
'method': 'copy_bq_table',
'table': table
})
return destination_str
def backup_table_to_storage(self, table):
self.big_query_client.set_table_ref(table)
copy_table_ref = self.big_query_client.table_ref
date_time_obj = datetime.utcnow()
destination = f'gs://{self.definitions["service"]}-etl/data/{table}/{date_time_obj.strftime("%m-%d-%Y_%H:%M:%S")}_UTC_*.avro'
result = self.big_query_client.export_table_to_storage(
table=copy_table_ref, destination=destination)
if result:
self.sd_logger.info(
{'message': f"Table {table} exported to {destination}"}, {
'class': 'Schema',
'method': 'backup_table_to_storage'
})
else:
self.sd_logger.error(self.big_query_client.errors, {
'class': 'Schema',
'method': 'backup_table_to_storage'
})
return result
def delete_table(self, table):
self.big_query_client.set_table_ref(table)
result = self.big_query_client.delete_table()
if result:
self.sd_logger.info({'message': f"Table {table} deleted"}, {
'class': 'Schema',
'method': 'delete_table'
})
else:
self.sd_logger.error(self.big_query_client.errors, {
'class': 'Schema',
'method': 'delete_table'
})
return result
def test_check_dependencies_client(mock_service_account):
bq = BigQueryAdapter(mock_service_account)
with pytest.raises(RuntimeError):
bq.check_dependencies()
def test_get_client_success(mock_service_account):
bq = BigQueryAdapter(mock_service_account)
bq.get_client()
assert isinstance(bq.client, google.cloud.bigquery.client.Client)
def mock_configured_client(mock_service_account):
bq = BigQueryAdapter(mock_service_account)
bq.get_client()
return bq
def create_big_query_client(self) -> BigQueryAdapter:
big_query_client = BigQueryAdapter(self.service_account)
big_query_client.get_client()
big_query_client.set_data_set_ref(self.definitions['data_set'])
big_query_client.set_table_ref('sync_tracking_table')
return big_query_client
def create_client(self) -> BigQueryAdapter:
big_query_client = BigQueryAdapter(self.service_account)
big_query_client.get_client()
return big_query_client
class Audit(Task):
def __init__(self, service: str, **kwargs):
self.table = None
self.watched_column = None
self.primary_id = None
self.sample_size = 1000
self.service_account = service_account.Credentials.from_service_account_file(
os.environ['MYSQL_BIG_QUERY_GOOGLE_AUTH'])
self.definitions = service_helpers.get_definitions(service)
self.sd_logger = StackDriverAdapter(self.service_account)
self.sd_logger.get_client()
self.sd_logger.create_logger(f"{self.definitions['service']}-etl")
self.pub_sub_client = PubSubAdapter(self.service_account)
self.pub_sub_client.get_subscriber()
self.pub_sub_client.set_subscription(
f"{self.definitions['service']}-etl")
self.big_query_client = BigQueryAdapter(self.service_account)
self.big_query_client.get_client()
self.big_query_client.set_data_set_ref(self.definitions['data_set'])
self.my_sql_client = MySqlAdapter()
super().__init__(**kwargs)
def extract_message_values(self, message: dict) -> bool:
if self.table is None:
if 'table' in message:
self.table = message['table']
else:
self.sd_logger.error(
{
'error': 'Key: table was not found in message',
'data': message
}, {
'class': 'Audit',
'method': 'extract_message_values'
})
return False
if 'watched' in message:
self.watched_column = message['watched']
else:
self.sd_logger.error(
{
'error': 'Key: watched was not found in message',
'data': message
}, {
'class': 'Audit',
'method': 'extract_message_values',
"table": self.table
})
return False
if 'primary_id' in message:
self.primary_id = message['primary_id']
else:
self.sd_logger.error(
{
'error': 'Key: primary_id was not found in message',
'data': message
}, {
'class': 'Audit',
'method': 'extract_message_values',
"table": self.table
})
return False
return True
def big_query_last_updated_data(self) -> Union[datetime.datetime, bool]:
query = f"SELECT MAX({self.watched_column}) as last_updated FROM {self.definitions['data_set']}.{self.table}"
result = self.big_query_client.query(query)
if result:
for value in result:
if value.last_updated:
return value.last_updated
else:
# use string of the start of unix time as the default time
return False
else:
self.sd_logger.critical(
self.big_query_client.errors, {
'class': 'Audit',
'method': 'big_query_last_updated_data',
'table': self.table
})
return result
def get_total_distinct_mysql(
self, last_updated: datetime.datetime) -> Union[int, bool]:
if last_updated:
records = self.my_sql_client.count_distinct(
table=self.table,
index=self.primary_id,
watched_column=self.watched_column,
last_updated=last_updated)
else:
records = self.my_sql_client.count_distinct(table=self.table,
index=self.primary_id)
if records is False:
self.sd_logger.error({'error': self.my_sql_client.errors}, {
'class': 'Audit',
'method': 'get_total_distinct_mysql',
"table": self.table
})
return records
def get_total_distinct_big_query(self) -> int:
query = [
"SELECT COUNT(*) as total_count", "FROM (",
f"select DISTINCT {self.primary_id}",
f"FROM {self.definitions['data_set']}.{self.table}", ")"
]
result = self.big_query_client.query(' '.join(query))
if not result:
self.sd_logger.error({'error': self.big_query_client.errors}, {
'class': 'Audit',
'method': 'get_total_distinct_big_query',
"table": self.table
})
return False
for item in result:
return item.total_count
def audit_from_totals(self, total_mysql: int,
total_big_query: int) -> bool:
# check if the totals are the same
if total_mysql == total_big_query:
return True
# big_query total will be lower than the mysql most of the time
# allow it is be
passing_total = int(round((total_mysql * .99), 0))
if total_big_query >= passing_total:
return True
self.sd_logger.info(
{
'message': f"Audit totals did not match: {self.table}",
"data": {
"MySQL Total": total_mysql,
"Big Query Total": total_big_query,
"passing total": passing_total
}
}, {
'class': 'Audit',
'method': 'audit_from_totals',
"table": self.table
})
return False
def get_random_mysql(self, last_run: int = None) -> Union[list, bool]:
result = self.my_sql_client.get_random_records(
table=self.table,
limit=self.sample_size,
index=self.primary_id,
watched=self.watched_column,
last_updated=last_run)
if result is not False:
return result
self.sd_logger.error({'error': self.my_sql_client.errors}, {
'class': 'Audit',
'method': 'get_random_mysql',
"table": self.table
})
return False
def get_big_query_records_from_sample(self, sample: list) -> DataFrame:
primary_ids = self.primary_id.split(',')
or_statements = []
# get the same items from the mysql random query in big query
for item in sample:
pk_statements = []
for key in primary_ids:
if type(item[key]) is int:
pk_statements.append(f"`{key}` = {item[key]}")
else:
pk_statements.append(f"`{key}` = '{item[key]}'")
if type(item[self.watched_column]) is int:
watched_condition = f"AND `{self.watched_column}` = {item[self.watched_column]}"
else:
if item[self.watched_column] is None:
watched_condition = f"AND `{self.watched_column}` IS NULL"
else:
watched_condition = f"AND `{self.watched_column}` = '{item[self.watched_column]}'"
or_statements.append(
f"({' AND '.join(pk_statements)} {watched_condition})")
query = [
f"SELECT *", f"FROM {self.definitions['data_set']}.{self.table}",
f"WHERE {' OR '.join(or_statements)}", "ORDER BY"
]
order_by = []
for key in primary_ids:
order_by.append(f"{key} ASC")
query.append(', '.join(order_by))
result = self.big_query_client.query(' '.join(query))
if not result:
self.sd_logger.error({'error': self.big_query_client.errors}, {
'class': 'Audit',
'method': 'get_big_query_records_from_sample',
"table": self.table
})
return False
output = result.to_dataframe()
return output
def convert_mysql_to_data_frame(
self, mysql_data: list) -> Union[DataFrame, bool]:
self.big_query_client.set_table_ref(self.table)
bq_schema = self.big_query_client.get_schema()
schema = service_helpers.convert_schema_to_dict(bq_schema)
if len(mysql_data[0]) is not len(schema.keys()):
self.sd_logger.critical(
{
'message': "Schema and data length mismatch",
'schema_length': len(schema.keys()),
'data_length': len(mysql_data[0])
}, {
'class': 'Audit',
'method': 'convert_mysql_to_data_frame',
'table': self.table
})
return False
data_frame = pd.DataFrame.from_records(mysql_data,
columns=schema.keys())
try:
df = service_helpers.data_frame_to_schema(data_frame,
schema,
utc=True)
except ValueError as e:
self.sd_logger.critical({'message': 'Error: {}'.format(e)}, {
'class': 'Audit',
'method': 'transform_data_frame_to_match_big_query_schema',
'table': self.table
})
return False
return df
def audit_from_sample(self, mysql_data: DataFrame,
big_query_data: DataFrame) -> bool:
# test if data frames are equal - this will fail in most cases to do the poor data quality from sources
result = mysql_data.equals(big_query_data)
if result:
return True
# check if the number of returned rows are the same
# this check is useful because of the strictness of the queries that generate these DataFrames
if mysql_data.shape[0] == big_query_data.shape[0]:
return True
self.sd_logger.info(
{
'message': f"Audit Failure: {self.table}",
'DataFrame.equals': result,
'mysql.shape': mysql_data.shape[0],
'big_query.shape': big_query_data.shape[0]
}, {
'class': 'Audit',
'method': 'audit_from_sample',
'table': self.table
})
return False
