def alert_on_z_score(df, check, alert_type, checked_txt, conf):
df = df[df["result"].notnull()]
if len(df) <= 1:
return
last_el_zscore = stats.zscore(df["result"])[-1]
last_el = df["result"].iloc[-1]
if math.isnan(last_el_zscore):
return
if abs(last_el_zscore) > settings.ACCEPTABLE_Z_SCORE_DIFF:
alert_desc = "above" if last_el_zscore > 0 else "below"
alert = Alert(
text=f"""
{checked_txt},
{alert_desc} expected range, value: {last_el}, z_score: {last_el_zscore:.2f}
""",
severity=2,
table_id=check.table_id,
alert_type=alert_type,
created_at=conf.for_time,
)
metrics_session.add(alert)
metrics_session.commit()
def add_run():
run = Run(for_date=datetime.utcnow(),
status='not started',
run_type='scheduled')
metrics_session.add(run)
metrics_session.commit()
def create_column_checks(db, table):
metrics = {}
for col in table.schema["columns"]:
if col["name"] in settings.SKIP_COLUMNS:
continue
if col["type"] not in db.numeric_types() + db.character_types():
continue
checks_for_col = []
if col["type"] in db.numeric_types():
checks_for_col = [el for el in Metric.FOR_NUMERICAL_COL]
elif col["type"] in db.character_types():
checks_for_col = [el for el in Metric.FOR_TEXT_COL]
metrics[col["name"]] = checks_for_col
check = Check(
table_id=table.id,
name="column_values",
metrics=metrics,
query={
"type": "standard",
"path": f"redata.checks.data_values.check_column_values",
"params": {
"time_interval": "1 day"
},
},
)
metrics_session.add(check)
metrics_session.commit()
def alert_for_schema_change(db, check, conf):
df = get_last_results(db,
check,
Metric.TABLE_METRIC,
Metric.SCHEMA_CHANGE,
conf,
days=1)
for index, row in df.iterrows():
changes = json.loads(row[0])
if changes["operation"] == "table detected":
continue
alert = Alert(
text=f"""
schema change detected - {changes['operation']}: {changes['column_name']}
""",
severity=2,
table_id=check.table_id,
alert_type=check.name,
created_at=conf.for_time,
)
metrics_session.add(alert)
metrics_session.commit()
def create_column_checks(db, table):
metrics = {}
for col in table.schema['columns']:
if col['name'] in settings.SKIP_COLUMNS:
continue
if col['type'] not in db.numeric_types() + db.character_types():
continue
checks_for_col = []
if col['type'] in db.numeric_types():
checks_for_col = [el for el in Metric.FOR_NUMERICAL_COL]
elif col['type'] in db.character_types():
checks_for_col = [el for el in Metric.FOR_TEXT_COL]
metrics[col['name']] = checks_for_col
check = Check(table_id=table.id,
name='column_values',
metrics=metrics,
query={
'type': 'standard',
'path': f'redata.checks.data_values.check_column_values',
'params': {
'time_interval': '1 day'
}
})
metrics_session.add(check)
metrics_session.commit()
def alert_on_z_score(df, table, check_col, alert_type, checked_txt):
df = df[df[check_col].notnull()]
if len(df) <= 1:
return
last_el_zscore = stats.zscore(df[check_col])[-1]
last_el = df[check_col].iloc[-1]
if math.isnan(last_el_zscore):
return
if abs(last_el_zscore) > settings.ACCEPTABLE_Z_SCORE_DIFF:
alert_desc = 'above' if last_el_zscore > 0 else 'below'
print(f"Adding alert about table {table.table_name}")
alert = Alert(text=f"""
{checked_txt},
{alert_desc} expected range, value: {last_el}, z_score: {last_el_zscore:.2f}
""",
severity=2,
table_id=table.id,
alert_type=alert_type)
metrics_session.add(alert)
metrics_session.commit()
def insert_schema_changed_record(table, operation, column_name, column_type,
column_count):
metric = MetricsSchemaChanges(table_id=table.id,
operation=operation,
column_name=column_name,
column_type=column_type,
column_count=column_count)
metrics_session.add(metric)
metrics_session.commit()
def check_data_volume(db, table, time_interval):
result = db.check_data_volume(table, time_interval)
metric = MetricsDataVolume(table_id=table.id,
time_interval=time_interval,
count=result.count)
metrics_session.add(metric)
metrics_session.commit()
def setup_for_source_table(cls, db, db_table_name):
print (f"Running setup for {db_table_name}")
valid_types = db.datetime_types()
schema_cols = get_current_table_schema(db, db_table_name)
table = MonitoredTable(
table_name=db_table_name,
schema={'columns': schema_cols},
source_db=db.name
)
# heuristics to find best column to sort by when computing stats about data
# TODO: could probably look up in a provided table of regex + score, with higher scored matches being preferred
# list all date/timestamp columns, filtering out anything that's blacklisted in configuration
blacklist_regex = settings.REDATA_TIME_COL_BLACKLIST_REGEX
matching_cols = [col['name'] for col in schema_cols if col['type'] in valid_types and re.search(blacklist_regex, col['name']) is None]
# from matches, collect time cols that have max values at or before "now"
cols_by_ts = defaultdict(list)
now_ts = datetime.datetime.now()
for col in matching_cols:
max_ts = db.get_max_timestamp(table, col)
if max_ts <= now_ts:
cols_by_ts[max_ts].append(col)
# list of all viable candidates, ordered by latest timestamp first
candidates = list(itertools.chain(
*[cols for ts, cols in sorted(cols_by_ts.items(), reverse=True)]
))
# list of preferred columns out of the viable ones, by name filtering
preferred = [col for col in candidates if col.lower().find('creat') != -1]
if len(candidates) == 0:
# no columns found? ignore table..
# TODO: add it, but set to disabled, for screening via web UI when we have one
print (f"Not found column to sort by for {db_table_name}, skipping it for now")
return None
else:
# if multiple columns found, primarily select from 'preferred' if exists, then set up the table
col_name = preferred[0] if preferred else candidates[0]
col_type = [col['type'] for col in schema_cols if col['name'] == col_name][0]
if len(candidates) > 1:
print (f"Found multiple columns to sort by {candidates}, choosing {col_name}, please update in DB if needed")
else:
print (f"Found column to sort by {col_name}")
table.time_column=col_name
table.time_column_type=col_type
metrics_session.add(table)
metrics_session.commit()
return table
def add_run():
scan = Scan(
start_date=datetime.utcnow(),
end_date=datetime.utcnow(),
status="not started",
run_type="scheduled",
)
metrics_session.add(scan)
metrics_session.commit()
def check_data_delayed(db, table, conf):
result = db.check_data_delayed(table, conf)
if result[0]:
metric = MetricsDataDelay(table_id=table.id,
value=result[0].total_seconds(),
created_at=conf.for_time)
metrics_session.add(metric)
metrics_session.commit()
def check_data_delayed(db, table):
result = db.check_data_delayed(table)
if result[0]:
metric = MetricsDataDelay(
table_id=table.id,
value=result[0].total_seconds()
)
metrics_session.add(metric)
metrics_session.commit()
def check_generic(func_name, db, table, checked_column, time_interval):
result = db.check_generic(func_name, table, checked_column, time_interval)
metric = MetricsDataValues(table_id=table.id,
column_name=checked_column,
check_name=f'check_{func_name}',
check_value=result.value,
time_interval=time_interval)
metrics_session.add(metric)
metrics_session.commit()
def check_count_nulls(db, table, checked_column, time_interval):
result = db.check_count_nulls(table, checked_column, time_interval)
metric = MetricsDataValues(table_id=table.id,
column_name=checked_column,
check_name='check_count_nulls',
check_value=result.value,
time_interval=time_interval)
metrics_session.add(metric)
metrics_session.commit()
def check_if_schema_changed(db, table, check, conf):
def schema_to_dict(schema):
return dict([(el["name"], el["type"]) for el in schema])
def sorted_to_compare(schema):
return sorted(schema, key=lambda x: sorted(x.items()))
last_schema = table.schema["columns"]
table_name = table.table_name
results = []
current_schema = db.get_table_schema(table.table_name, table.namespace)
if sorted_to_compare(last_schema) != sorted_to_compare(current_schema):
last_dict = schema_to_dict(last_schema)
current_dict = schema_to_dict(current_schema)
for el in last_dict:
if el not in current_dict:
print(f"{el} was removed from schema")
results.append(
schema_changed_record("column removed", el, last_dict[el],
len(current_dict), conf))
for el in current_dict:
if el not in last_dict:
print(f"{el} was added to schema")
results.append(
schema_changed_record("column added", el, current_dict[el],
len(current_dict), conf))
else:
prev_type = last_dict[el]
curr_type = current_dict[el]
if curr_type != prev_type:
print(
f"Type of column: {el} changed from {prev_type} to {curr_type}"
)
results.append(
schema_changed_record(
"column changed",
el,
current_dict[el],
len(current_dict),
conf,
))
table.schema = {"columns": current_schema}
metrics_session.commit()
return results
def check_count_per_value(db, table, checked_column, time_interval):
result = db.check_count_per_value(table, checked_column, time_interval)
for row in (result or []):
metric = MetricsDataValues(table_id=table.id,
column_name=checked_column,
column_value=row.value,
check_name='check_count_per_value',
check_value=row.count,
time_interval=time_interval)
metrics_session.add(metric)
metrics_session.commit()
def create_admin_user_if_not_exist(cls):
assert os.environ.get(
'REDATA_ADMIN_USER'), 'please set env variable for admin user'
assert os.environ.get('REDATA_ADMIN_PASSWORD'
), 'please set env variable for admin password'
is_admin = metrics_session.query(cls).filter(
cls.login == os.environ.get('REDATA_ADMIN_USER')).count()
if not is_admin:
user = cls(login=os.environ.get('REDATA_ADMIN_USER'),
password=generate_password_hash(
os.environ.get('REDATA_ADMIN_PASSWORD')))
metrics_session.add(user)
metrics_session.commit()
print("Created admin user")
def process_run():
run = Run.get_not_started_run()
if run is not None:
run.status = 'pending'
metrics_session.commit()
conf = Conf(run.for_date)
for source_db in DataSource.source_dbs():
run_check_for_new_tables(source_db, conf)
run_checks(source_db, conf)
run_compute_alerts(source_db, conf)
generate_grafana()
run.status = 'success'
metrics_session.commit()
def check_if_schema_changed(db, table, conf):
def schema_to_dict(schema):
return dict([(el['name'], el['type']) for el in schema])
def sorted_to_compare(schema):
return sorted(schema, key=lambda x: sorted(x.items()))
last_schema = table.schema['columns']
table_name = table.table_name
current_schema = db.get_table_schema(table.table_name, table.namespace)
if sorted_to_compare(last_schema) != sorted_to_compare(current_schema):
last_dict = schema_to_dict(last_schema)
current_dict = schema_to_dict(current_schema)
for el in last_dict:
if el not in current_dict:
print(f"{el} was removed from schema")
insert_schema_changed_record(table, 'column removed',
el, last_dict[el],
len(current_dict), conf)
for el in current_dict:
if el not in last_dict:
print(f"{el} was added to schema")
insert_schema_changed_record(table, 'column added',
el, current_dict[el],
len(current_dict), conf)
else:
prev_type = last_dict[el]
curr_type = current_dict[el]
if curr_type != prev_type:
print(
f"Type of column: {el} changed from {prev_type} to {curr_type}"
)
insert_schema_changed_record(table, 'column changed', el,
current_dict[el],
len(current_dict), conf)
table.schema = {'columns': current_schema}
metrics_session.commit()
def create_dashboards():
grafana_api = GrafanaFace(
auth=(settings.GF_SECURITY_ADMIN_USER,
settings.GF_SECURITY_ADMIN_PASSWORD),
host=f'{settings.GRAFANA_WEB_HOST}:{settings.GRAFANA_WEB_PORT}')
create_source_in_grafana(grafana_api)
create_notifcation_channels(grafana_api)
dashboards = []
for db in DataSource.source_dbs():
monitored_tables = MonitoredTable.get_monitored_tables(db.name)
for table in monitored_tables:
dash_data = create_dashboard_for_table(grafana_api, db, table)
table.grafana_url = dash_data['dashboard']['url']
dashboards.append(dash_data)
metrics_session.commit()
home_response = create_home_dashboard(grafana_api, dashboards)
star_home_dashboard(grafana_api, home_response)
def add_metrics(cls, results, check, conf):
print(f"Adding results for check: {check}")
for row in results:
for col, metrics in check.metrics.items():
for m in metrics:
select_name = col + '_' + m if col != Metric.TABLE_METRIC else m
m = MetricFromCheck(check_id=check.id,
table_id=check.table.id,
table_column=col if col else None,
params=check.query['params'],
metric=m,
result={'value': row[select_name]},
created_at=conf.for_time)
metrics_session.add(m)
metrics_session.commit()
def create_for_detected_table(db, table):
for check in table_checks:
func = check['func']
metric_dict = {Metric.TABLE_METRIC: [check['metric']]}
model_check = Check(table_id=table.id,
name=check['metric'],
metrics=metric_dict,
query={
'type': 'standard',
'path': f'redata.checks.{func}',
'params': check['params']
})
metrics_session.add(model_check)
metrics_session.commit()
create_column_checks(db, table)
def check_if_schema_changed(db, table):
def schema_to_dict(schema):
return dict([(el['name'], el['type']) for el in schema])
last_schema = table.schema['columns']
table_name = table.table_name
current_schema = db.get_table_schema(table.table_name)
print(table.table_name, current_schema)
if last_schema != current_schema:
last_dict = schema_to_dict(last_schema)
current_dict = schema_to_dict(current_schema)
for el in last_dict:
if el not in current_dict:
print(f"{el} was removed from schema")
insert_schema_changed_record(table, 'column removed', el,
last_dict[el], len(current_dict))
for el in current_dict:
if el not in last_dict:
print(f"{el} was added to schema")
insert_schema_changed_record(table, 'column added',
el, current_dict[el],
len(current_dict))
else:
prev_type = last_dict[el]
curr_type = current_dict[el]
if curr_type != prev_type:
print(
f"Type of column: {el} changed from {prev_type} to {curr_type}"
)
insert_schema_changed_record(table, 'column added', el,
current_dict[el],
len(current_dict))
table.schema = current_schema
metrics_session.commit()
def process_run():
try:
scan = Scan.get_not_started_run()
if scan is not None:
scan.status = "pending"
metrics_session.commit()
for_time = scan.start_date
while for_time <= scan.end_date:
conf = Conf(for_time)
for source_db in DataSource.source_dbs():
run_check_for_new_tables(source_db, conf)
run_checks(source_db, conf)
run_compute_alerts(source_db, conf)
for_time += timedelta(days=1)
generate_grafana()
scan.status = "success"
metrics_session.commit()
except Exception:
scan.status = "error"
metrics_session.commit()
def add_metrics(cls, results, check, conf):
print(f"Adding results for check: {check}")
for row in results:
for col, metrics in check.metrics.items():
for m in metrics:
select_name = name_for(col, m)
m = MetricFromCheck(
check_id=check.id,
table_id=check.table.id,
table_column=col,
params=check.query.get("params", {}),
metric=m,
result={"value": row[select_name]},
created_at=conf.for_time,
)
metrics_session.add(m)
metrics_session.commit()
def setup_for_source_table(cls, db, db_table_name):
print (f"Running setup for {db_table_name}")
preference = [
'timestamp without time zone',
'timestamp with time zone',
'date',
'datetime' #mysql
]
schema_cols = get_current_table_schema(db, db_table_name)
# heuristics to find best column to sort by when computing stats about data
proper_type = [col['name'] for col in schema_cols if col['type'] in preference]
columns = [c for c in proper_type if c.find('creat') != -1 ]
colname, col_type = None, None
if len(proper_type) == 0:
print (f"Not found column to sort by for {db_table_name}, skipping it for now")
return None
else:
if len(columns) > 1:
print (f"Found multiple columns to sort by {columns}, choosing {columns[0]}, please update in DB if needed")
col_name = columns[0] if columns else proper_type[0]
col_type = [col['type'] for col in schema_cols if col['name'] == col_name][0]
print (f"Found column to sort by {col_name}")
table = MonitoredTable(
table_name=db_table_name,
time_column=col_name,
time_column_type=col_type,
schema={'columns': schema_cols},
source_db=db.name
)
metrics_session.add(table)
metrics_session.commit()
return table
def create_for_detected_table(db, table):
for check in table_checks:
func = check["func"]
metric_dict = {Metric.TABLE_METRIC: [check["metric"]]}
model_check = Check(
table_id=table.id,
name=check["metric"],
metrics=metric_dict,
query={
"type": "standard",
"path": f"redata.checks.{func}",
"params": check["params"],
},
)
metrics_session.add(model_check)
metrics_session.commit()
create_column_checks(db, table)
def check_data_volume_diff(db, table):
from_time = metrics_db.execute(
text("""
SELECT max(created_at) as created_at
FROM metrics_data_volume_diff
WHERE table_id = :table_id
"""), {
'table_id': table.id
}).first()
from_time = from_time.created_at if from_time else None
if from_time is None:
# if now previous diff computed, compute from start of day
# mostly because we show that stat daily
from_time = datetime.combine(date.today(), time())
result = db.check_data_volume_diff(table, from_time=from_time)
for r in (result or []):
metric = MetricsDataVolumeDiff(table_id=table.id,
date=r.date,
count=r.count)
metrics_session.add(metric)
metrics_session.commit()
def update_schema_for_table(cls, table, schema_cols):
table = metrics_session.query(cls).filter(
cls.table_name == table).first()
table.schema = {'columns': schema_cols}
metrics_session.commit()
