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utils.py
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utils.py
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# -*- coding: utf-8 -*-
# pylint: disable=C,R,W
"""Utility functions used across Superset"""
from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals
from builtins import object
from datetime import date, datetime, time, timedelta
import decimal
from email.mime.application import MIMEApplication
from email.mime.multipart import MIMEMultipart
from email.mime.text import MIMEText
from email.utils import formatdate
import errno
import functools
import json
import logging
import os
import signal
import smtplib
import sys
import uuid
import zlib
import bleach
import celery
from dateutil.parser import parse
from flask import flash, Markup, render_template
from flask_babel import gettext as __
from flask_cache import Cache
import markdown as md
import numpy
import pandas as pd
import parsedatetime
from past.builtins import basestring
from pydruid.utils.having import Having
import pytz
import sqlalchemy as sa
from sqlalchemy import event, exc, select
from sqlalchemy.types import TEXT, TypeDecorator
from superset.exceptions import SupersetException, SupersetTimeoutException
logging.getLogger('MARKDOWN').setLevel(logging.INFO)
PY3K = sys.version_info >= (3, 0)
EPOCH = datetime(1970, 1, 1)
DTTM_ALIAS = '__timestamp'
ADHOC_METRIC_EXPRESSION_TYPES = {
'SIMPLE': 'SIMPLE',
'SQL': 'SQL',
}
JS_MAX_INTEGER = 9007199254740991 # Largest int Java Script can handle 2^53-1
def flasher(msg, severity=None):
"""Flask's flash if available, logging call if not"""
try:
flash(msg, severity)
except RuntimeError:
if severity == 'danger':
logging.error(msg)
else:
logging.info(msg)
class _memoized(object): # noqa
"""Decorator that caches a function's return value each time it is called
If called later with the same arguments, the cached value is returned, and
not re-evaluated.
Define ``watch`` as a tuple of attribute names if this Decorator
should account for instance variable changes.
"""
def __init__(self, func, watch=()):
self.func = func
self.cache = {}
self.is_method = False
self.watch = watch
def __call__(self, *args, **kwargs):
key = [args, frozenset(kwargs.items())]
if self.is_method:
key.append(tuple([getattr(args[0], v, None) for v in self.watch]))
key = tuple(key)
if key in self.cache:
return self.cache[key]
try:
value = self.func(*args, **kwargs)
self.cache[key] = value
return value
except TypeError:
# uncachable -- for instance, passing a list as an argument.
# Better to not cache than to blow up entirely.
return self.func(*args, **kwargs)
def __repr__(self):
"""Return the function's docstring."""
return self.func.__doc__
def __get__(self, obj, objtype):
if not self.is_method:
self.is_method = True
"""Support instance methods."""
return functools.partial(self.__call__, obj)
def memoized(func=None, watch=None):
if func:
return _memoized(func)
else:
def wrapper(f):
return _memoized(f, watch)
return wrapper
def js_string_to_python(item):
return None if item in ('null', 'undefined') else item
def string_to_num(s):
"""Converts a string to an int/float
Returns ``None`` if it can't be converted
>>> string_to_num('5')
5
>>> string_to_num('5.2')
5.2
>>> string_to_num(10)
10
>>> string_to_num(10.1)
10.1
>>> string_to_num('this is not a string') is None
True
"""
if isinstance(s, (int, float)):
return s
if s.isdigit():
return int(s)
try:
return float(s)
except ValueError:
return None
class DimSelector(Having):
def __init__(self, **args):
# Just a hack to prevent any exceptions
Having.__init__(self, type='equalTo', aggregation=None, value=None)
self.having = {
'having': {
'type': 'dimSelector',
'dimension': args['dimension'],
'value': args['value'],
},
}
def list_minus(l, minus):
"""Returns l without what is in minus
>>> list_minus([1, 2, 3], [2])
[1, 3]
"""
return [o for o in l if o not in minus]
def parse_human_datetime(s):
"""
Returns ``datetime.datetime`` from human readable strings
>>> from datetime import date, timedelta
>>> from dateutil.relativedelta import relativedelta
>>> parse_human_datetime('2015-04-03')
datetime.datetime(2015, 4, 3, 0, 0)
>>> parse_human_datetime('2/3/1969')
datetime.datetime(1969, 2, 3, 0, 0)
>>> parse_human_datetime('now') <= datetime.now()
True
>>> parse_human_datetime('yesterday') <= datetime.now()
True
>>> date.today() - timedelta(1) == parse_human_datetime('yesterday').date()
True
>>> year_ago_1 = parse_human_datetime('one year ago').date()
>>> year_ago_2 = (datetime.now() - relativedelta(years=1) ).date()
>>> year_ago_1 == year_ago_2
True
"""
if not s:
return None
try:
dttm = parse(s)
except Exception:
try:
cal = parsedatetime.Calendar()
parsed_dttm, parsed_flags = cal.parseDT(s)
# when time is not extracted, we 'reset to midnight'
if parsed_flags & 2 == 0:
parsed_dttm = parsed_dttm.replace(hour=0, minute=0, second=0)
dttm = dttm_from_timtuple(parsed_dttm.utctimetuple())
except Exception as e:
logging.exception(e)
raise ValueError("Couldn't parse date string [{}]".format(s))
return dttm
def dttm_from_timtuple(d):
return datetime(
d.tm_year, d.tm_mon, d.tm_mday, d.tm_hour, d.tm_min, d.tm_sec)
def decode_dashboards(o):
"""
Function to be passed into json.loads obj_hook parameter
Recreates the dashboard object from a json representation.
"""
import superset.models.core as models
from superset.connectors.sqla.models import (
SqlaTable, SqlMetric, TableColumn,
)
if '__Dashboard__' in o:
d = models.Dashboard()
d.__dict__.update(o['__Dashboard__'])
return d
elif '__Slice__' in o:
d = models.Slice()
d.__dict__.update(o['__Slice__'])
return d
elif '__TableColumn__' in o:
d = TableColumn()
d.__dict__.update(o['__TableColumn__'])
return d
elif '__SqlaTable__' in o:
d = SqlaTable()
d.__dict__.update(o['__SqlaTable__'])
return d
elif '__SqlMetric__' in o:
d = SqlMetric()
d.__dict__.update(o['__SqlMetric__'])
return d
elif '__datetime__' in o:
return datetime.strptime(o['__datetime__'], '%Y-%m-%dT%H:%M:%S')
else:
return o
class DashboardEncoder(json.JSONEncoder):
# pylint: disable=E0202
def default(self, o):
try:
vals = {
k: v for k, v in o.__dict__.items() if k != '_sa_instance_state'}
return {'__{}__'.format(o.__class__.__name__): vals}
except Exception:
if type(o) == datetime:
return {'__datetime__': o.replace(microsecond=0).isoformat()}
return json.JSONEncoder.default(self, o)
def parse_human_timedelta(s):
"""
Returns ``datetime.datetime`` from natural language time deltas
>>> parse_human_datetime('now') <= datetime.now()
True
"""
cal = parsedatetime.Calendar()
dttm = dttm_from_timtuple(datetime.now().timetuple())
d = cal.parse(s, dttm)[0]
d = datetime(d.tm_year, d.tm_mon, d.tm_mday, d.tm_hour, d.tm_min, d.tm_sec)
return d - dttm
class JSONEncodedDict(TypeDecorator):
"""Represents an immutable structure as a json-encoded string."""
impl = TEXT
def process_bind_param(self, value, dialect):
if value is not None:
value = json.dumps(value)
return value
def process_result_value(self, value, dialect):
if value is not None:
value = json.loads(value)
return value
def datetime_f(dttm):
"""Formats datetime to take less room when it is recent"""
if dttm:
dttm = dttm.isoformat()
now_iso = datetime.now().isoformat()
if now_iso[:10] == dttm[:10]:
dttm = dttm[11:]
elif now_iso[:4] == dttm[:4]:
dttm = dttm[5:]
return '<nobr>{}</nobr>'.format(dttm)
def base_json_conv(obj):
if isinstance(obj, numpy.int64):
return int(obj)
elif isinstance(obj, numpy.bool_):
return bool(obj)
elif isinstance(obj, set):
return list(obj)
elif isinstance(obj, decimal.Decimal):
return float(obj)
elif isinstance(obj, uuid.UUID):
return str(obj)
elif isinstance(obj, timedelta):
return str(obj)
def json_iso_dttm_ser(obj, pessimistic=False):
"""
json serializer that deals with dates
>>> dttm = datetime(1970, 1, 1)
>>> json.dumps({'dttm': dttm}, default=json_iso_dttm_ser)
'{"dttm": "1970-01-01T00:00:00"}'
"""
val = base_json_conv(obj)
if val is not None:
return val
if isinstance(obj, (datetime, date, time, pd.Timestamp)):
obj = obj.isoformat()
else:
if pessimistic:
return 'Unserializable [{}]'.format(type(obj))
else:
raise TypeError(
'Unserializable object {} of type {}'.format(obj, type(obj)))
return obj
def pessimistic_json_iso_dttm_ser(obj):
"""Proxy to call json_iso_dttm_ser in a pessimistic way
If one of object is not serializable to json, it will still succeed"""
return json_iso_dttm_ser(obj, pessimistic=True)
def datetime_to_epoch(dttm):
if dttm.tzinfo:
epoch_with_tz = pytz.utc.localize(EPOCH)
return (dttm - epoch_with_tz).total_seconds() * 1000
return (dttm - EPOCH).total_seconds() * 1000
def now_as_float():
return datetime_to_epoch(datetime.utcnow())
def json_int_dttm_ser(obj):
"""json serializer that deals with dates"""
val = base_json_conv(obj)
if val is not None:
return val
if isinstance(obj, (datetime, pd.Timestamp)):
obj = datetime_to_epoch(obj)
elif isinstance(obj, date):
obj = (obj - EPOCH.date()).total_seconds() * 1000
else:
raise TypeError(
'Unserializable object {} of type {}'.format(obj, type(obj)))
return obj
def json_dumps_w_dates(payload):
return json.dumps(payload, default=json_int_dttm_ser)
def error_msg_from_exception(e):
"""Translate exception into error message
Database have different ways to handle exception. This function attempts
to make sense of the exception object and construct a human readable
sentence.
TODO(bkyryliuk): parse the Presto error message from the connection
created via create_engine.
engine = create_engine('presto://localhost:3506/silver') -
gives an e.message as the str(dict)
presto.connect('localhost', port=3506, catalog='silver') - as a dict.
The latter version is parsed correctly by this function.
"""
msg = ''
if hasattr(e, 'message'):
if isinstance(e.message, dict):
msg = e.message.get('message')
elif e.message:
msg = '{}'.format(e.message)
return msg or '{}'.format(e)
def markdown(s, markup_wrap=False):
safe_markdown_tags = ['h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'b', 'i',
'strong', 'em', 'tt', 'p', 'br', 'span',
'div', 'blockquote', 'code', 'hr', 'ul', 'ol',
'li', 'dd', 'dt', 'img', 'a']
safe_markdown_attrs = {'img': ['src', 'alt', 'title'],
'a': ['href', 'alt', 'title']}
s = md.markdown(s or '', [
'markdown.extensions.tables',
'markdown.extensions.fenced_code',
'markdown.extensions.codehilite',
])
s = bleach.clean(s, safe_markdown_tags, safe_markdown_attrs)
if markup_wrap:
s = Markup(s)
return s
def readfile(file_path):
with open(file_path) as f:
content = f.read()
return content
def generic_find_constraint_name(table, columns, referenced, db):
"""Utility to find a constraint name in alembic migrations"""
t = sa.Table(table, db.metadata, autoload=True, autoload_with=db.engine)
for fk in t.foreign_key_constraints:
if fk.referred_table.name == referenced and set(fk.column_keys) == columns:
return fk.name
def generic_find_fk_constraint_name(table, columns, referenced, insp):
"""Utility to find a foreign-key constraint name in alembic migrations"""
for fk in insp.get_foreign_keys(table):
if fk['referred_table'] == referenced and set(fk['referred_columns']) == columns:
return fk['name']
def generic_find_fk_constraint_names(table, columns, referenced, insp):
"""Utility to find foreign-key constraint names in alembic migrations"""
names = set()
for fk in insp.get_foreign_keys(table):
if fk['referred_table'] == referenced and set(fk['referred_columns']) == columns:
names.add(fk['name'])
return names
def generic_find_uq_constraint_name(table, columns, insp):
"""Utility to find a unique constraint name in alembic migrations"""
for uq in insp.get_unique_constraints(table):
if columns == set(uq['column_names']):
return uq['name']
def get_datasource_full_name(database_name, datasource_name, schema=None):
if not schema:
return '[{}].[{}]'.format(database_name, datasource_name)
return '[{}].[{}].[{}]'.format(database_name, schema, datasource_name)
def validate_json(obj):
if obj:
try:
json.loads(obj)
except Exception:
raise SupersetException('JSON is not valid')
def table_has_constraint(table, name, db):
"""Utility to find a constraint name in alembic migrations"""
t = sa.Table(table, db.metadata, autoload=True, autoload_with=db.engine)
for c in t.constraints:
if c.name == name:
return True
return False
class timeout(object):
"""
To be used in a ``with`` block and timeout its content.
"""
def __init__(self, seconds=1, error_message='Timeout'):
self.seconds = seconds
self.error_message = error_message
def handle_timeout(self, signum, frame):
logging.error('Process timed out')
raise SupersetTimeoutException(self.error_message)
def __enter__(self):
try:
signal.signal(signal.SIGALRM, self.handle_timeout)
signal.alarm(self.seconds)
except ValueError as e:
logging.warning("timeout can't be used in the current context")
logging.exception(e)
def __exit__(self, type, value, traceback):
try:
signal.alarm(0)
except ValueError as e:
logging.warning("timeout can't be used in the current context")
logging.exception(e)
def pessimistic_connection_handling(some_engine):
@event.listens_for(some_engine, 'engine_connect')
def ping_connection(connection, branch):
if branch:
# 'branch' refers to a sub-connection of a connection,
# we don't want to bother pinging on these.
return
# turn off 'close with result'. This flag is only used with
# 'connectionless' execution, otherwise will be False in any case
save_should_close_with_result = connection.should_close_with_result
connection.should_close_with_result = False
try:
# run a SELECT 1. use a core select() so that
# the SELECT of a scalar value without a table is
# appropriately formatted for the backend
connection.scalar(select([1]))
except exc.DBAPIError as err:
# catch SQLAlchemy's DBAPIError, which is a wrapper
# for the DBAPI's exception. It includes a .connection_invalidated
# attribute which specifies if this connection is a 'disconnect'
# condition, which is based on inspection of the original exception
# by the dialect in use.
if err.connection_invalidated:
# run the same SELECT again - the connection will re-validate
# itself and establish a new connection. The disconnect detection
# here also causes the whole connection pool to be invalidated
# so that all stale connections are discarded.
connection.scalar(select([1]))
else:
raise
finally:
# restore 'close with result'
connection.should_close_with_result = save_should_close_with_result
class QueryStatus(object):
"""Enum-type class for query statuses"""
STOPPED = 'stopped'
FAILED = 'failed'
PENDING = 'pending'
RUNNING = 'running'
SCHEDULED = 'scheduled'
SUCCESS = 'success'
TIMED_OUT = 'timed_out'
def notify_user_about_perm_udate(
granter, user, role, datasource, tpl_name, config):
msg = render_template(tpl_name, granter=granter, user=user, role=role,
datasource=datasource)
logging.info(msg)
subject = __('[Superset] Access to the datasource %(name)s was granted',
name=datasource.full_name)
send_email_smtp(user.email, subject, msg, config, bcc=granter.email,
dryrun=not config.get('EMAIL_NOTIFICATIONS'))
def send_email_smtp(to, subject, html_content, config, files=None,
dryrun=False, cc=None, bcc=None, mime_subtype='mixed'):
"""
Send an email with html content, eg:
send_email_smtp(
'[email protected]', 'foo', '<b>Foo</b> bar',['/dev/null'], dryrun=True)
"""
smtp_mail_from = config.get('SMTP_MAIL_FROM')
to = get_email_address_list(to)
msg = MIMEMultipart(mime_subtype)
msg['Subject'] = subject
msg['From'] = smtp_mail_from
msg['To'] = ', '.join(to)
recipients = to
if cc:
cc = get_email_address_list(cc)
msg['CC'] = ', '.join(cc)
recipients = recipients + cc
if bcc:
# don't add bcc in header
bcc = get_email_address_list(bcc)
recipients = recipients + bcc
msg['Date'] = formatdate(localtime=True)
mime_text = MIMEText(html_content, 'html')
msg.attach(mime_text)
for fname in files or []:
basename = os.path.basename(fname)
with open(fname, 'rb') as f:
msg.attach(
MIMEApplication(
f.read(),
Content_Disposition="attachment; filename='%s'" % basename,
Name=basename))
send_MIME_email(smtp_mail_from, recipients, msg, config, dryrun=dryrun)
def send_MIME_email(e_from, e_to, mime_msg, config, dryrun=False):
SMTP_HOST = config.get('SMTP_HOST')
SMTP_PORT = config.get('SMTP_PORT')
SMTP_USER = config.get('SMTP_USER')
SMTP_PASSWORD = config.get('SMTP_PASSWORD')
SMTP_STARTTLS = config.get('SMTP_STARTTLS')
SMTP_SSL = config.get('SMTP_SSL')
if not dryrun:
s = smtplib.SMTP_SSL(SMTP_HOST, SMTP_PORT) if SMTP_SSL else \
smtplib.SMTP(SMTP_HOST, SMTP_PORT)
if SMTP_STARTTLS:
s.starttls()
if SMTP_USER and SMTP_PASSWORD:
s.login(SMTP_USER, SMTP_PASSWORD)
logging.info('Sent an alert email to ' + str(e_to))
s.sendmail(e_from, e_to, mime_msg.as_string())
s.quit()
else:
logging.info('Dryrun enabled, email notification content is below:')
logging.info(mime_msg.as_string())
def get_email_address_list(address_string):
if isinstance(address_string, basestring):
if ',' in address_string:
address_string = address_string.split(',')
elif ';' in address_string:
address_string = address_string.split(';')
else:
address_string = [address_string]
return address_string
def choicify(values):
"""Takes an iterable and makes an iterable of tuples with it"""
return [(v, v) for v in values]
def setup_cache(app, cache_config):
"""Setup the flask-cache on a flask app"""
if cache_config and cache_config.get('CACHE_TYPE') != 'null':
return Cache(app, config=cache_config)
def zlib_compress(data):
"""
Compress things in a py2/3 safe fashion
>>> json_str = '{"test": 1}'
>>> blob = zlib_compress(json_str)
"""
if PY3K:
if isinstance(data, str):
return zlib.compress(bytes(data, 'utf-8'))
return zlib.compress(data)
return zlib.compress(data)
def zlib_decompress_to_string(blob):
"""
Decompress things to a string in a py2/3 safe fashion
>>> json_str = '{"test": 1}'
>>> blob = zlib_compress(json_str)
>>> got_str = zlib_decompress_to_string(blob)
>>> got_str == json_str
True
"""
if PY3K:
if isinstance(blob, bytes):
decompressed = zlib.decompress(blob)
else:
decompressed = zlib.decompress(bytes(blob, 'utf-8'))
return decompressed.decode('utf-8')
return zlib.decompress(blob)
_celery_app = None
def get_celery_app(config):
global _celery_app
if _celery_app:
return _celery_app
_celery_app = celery.Celery(config_source=config.get('CELERY_CONFIG'))
return _celery_app
def merge_extra_filters(form_data):
# extra_filters are temporary/contextual filters that are external
# to the slice definition. We use those for dynamic interactive
# filters like the ones emitted by the "Filter Box" visualization
if 'extra_filters' in form_data:
# __form and __to are special extra_filters that target time
# boundaries. The rest of extra_filters are simple
# [column_name in list_of_values]. `__` prefix is there to avoid
# potential conflicts with column that would be named `from` or `to`
if 'filters' not in form_data:
form_data['filters'] = []
date_options = {
'__from': 'since',
'__to': 'until',
'__time_col': 'granularity_sqla',
'__time_grain': 'time_grain_sqla',
'__time_origin': 'druid_time_origin',
'__granularity': 'granularity',
}
# Grab list of existing filters 'keyed' on the column and operator
def get_filter_key(f):
return f['col'] + '__' + f['op']
existing_filters = {}
for existing in form_data['filters']:
if existing['col'] is not None:
existing_filters[get_filter_key(existing)] = existing['val']
for filtr in form_data['extra_filters']:
# Pull out time filters/options and merge into form data
if date_options.get(filtr['col']):
if filtr.get('val'):
form_data[date_options[filtr['col']]] = filtr['val']
elif filtr['val'] and len(filtr['val']):
# Merge column filters
filter_key = get_filter_key(filtr)
if filter_key in existing_filters:
# Check if the filter already exists
if isinstance(filtr['val'], list):
if isinstance(existing_filters[filter_key], list):
# Add filters for unequal lists
# order doesn't matter
if (
sorted(existing_filters[filter_key]) !=
sorted(filtr['val'])
):
form_data['filters'] += [filtr]
else:
form_data['filters'] += [filtr]
else:
# Do not add filter if same value already exists
if filtr['val'] != existing_filters[filter_key]:
form_data['filters'] += [filtr]
else:
# Filter not found, add it
form_data['filters'] += [filtr]
# Remove extra filters from the form data since no longer needed
del form_data['extra_filters']
def merge_request_params(form_data, params):
url_params = {}
for key, value in params.items():
if key in ('form_data', 'r'):
continue
url_params[key] = value
form_data['url_params'] = url_params
def get_update_perms_flag():
val = os.environ.get('SUPERSET_UPDATE_PERMS')
return val.lower() not in ('0', 'false', 'no') if val else True
def user_label(user):
"""Given a user ORM FAB object, returns a label"""
if user:
if user.first_name and user.last_name:
return user.first_name + ' ' + user.last_name
else:
return user.username
def get_or_create_main_db():
from superset import conf, db
from superset.models import core as models
logging.info('Creating database reference')
dbobj = (
db.session.query(models.Database)
.filter_by(database_name='main')
.first())
if not dbobj:
dbobj = models.Database(database_name='main')
dbobj.set_sqlalchemy_uri(conf.get('SQLALCHEMY_DATABASE_URI'))
dbobj.expose_in_sqllab = True
dbobj.allow_run_sync = True
db.session.add(dbobj)
db.session.commit()
return dbobj
def is_adhoc_metric(metric):
return (
isinstance(metric, dict) and
(
(
metric['expressionType'] == ADHOC_METRIC_EXPRESSION_TYPES['SIMPLE'] and
metric['column'] and
metric['aggregate']
) or
(
metric['expressionType'] == ADHOC_METRIC_EXPRESSION_TYPES['SQL'] and
metric['sqlExpression']
)
) and
metric['label']
)
def get_metric_names(metrics):
return [metric['label'] if is_adhoc_metric(metric) else metric for metric in metrics]
def ensure_path_exists(path):
try:
os.makedirs(path)
except OSError as exc:
if not (os.path.isdir(path) and exc.errno == errno.EEXIST):
raise