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from datetime import datetime
from pytz import timezone as get_timezone, utc
from ..util.compat import get_localzone_name_compat
from .base import FormatColumn
EPOCH = datetime(1970, 1, 1, tzinfo=utc)
class DateTimeColumn(FormatColumn):
ch_type = 'DateTime'
py_types = (datetime, int)
format = 'I'
def __init__(self, timezone=None, offset_naive=True, **kwargs):
self.timezone = timezone
self.offset_naive = offset_naive
super(DateTimeColumn, self).__init__(**kwargs)
def after_read_items(self, items, nulls_map=None):
tz = self.timezone
fromts = datetime.fromtimestamp
# A bit ugly copy-paste. But it helps save time on items
# processing by avoiding lambda calls or if in loop.
if self.offset_naive:
if tz:
if nulls_map is None:
return tuple(
fromts(item, tz).replace(tzinfo=None)
for item in items
)
else:
return tuple(
(None if is_null else
fromts(items[i], tz).replace(tzinfo=None))
for i, is_null in enumerate(nulls_map)
)
else:
if nulls_map is None:
return tuple(fromts(item) for item in items)
else:
return tuple(
(None if is_null else fromts(items[i]))
for i, is_null in enumerate(nulls_map)
)
else:
if nulls_map is None:
return tuple(fromts(item, tz) for item in items)
else:
return tuple(
(None if is_null else fromts(items[i], tz))
for i, is_null in enumerate(nulls_map)
)
def before_write_items(self, items, nulls_map=None):
timezone = self.timezone
null_value = self.null_value
to_timestamp = datetime.timestamp
for i, item in enumerate(items):
if nulls_map and nulls_map[i]:
items[i] = null_value
continue
if isinstance(item, int):
# support supplying raw integers to avoid
# costly timezone conversions when using datetime
continue
if timezone:
# Set server's timezone for offset-naive datetime.
if item.tzinfo is None:
item = timezone.localize(item)
item = item.astimezone(utc)
else:
# If datetime is offset-aware use it's timezone.
if item.tzinfo is not None:
item = item.astimezone(utc)
items[i] = int(to_timestamp(item))
class DateTime64Column(DateTimeColumn):
ch_type = 'DateTime64'
format = 'q'
max_scale = 6
def __init__(self, scale=0, **kwargs):
self.scale = scale
super(DateTime64Column, self).__init__(**kwargs)
def after_read_items(self, items, nulls_map=None):
scale = float(10 ** self.scale)
tz = self.timezone
fromts = datetime.fromtimestamp
# A bit ugly copy-paste. But it helps save time on items
# processing by avoiding lambda calls or if in loop.
if self.offset_naive:
if tz:
if nulls_map is None:
return tuple(
fromts(item / scale, tz).replace(tzinfo=None)
for item in items
)
else:
return tuple(
(None if is_null else
fromts(items[i] / scale, tz).replace(tzinfo=None))
for i, is_null in enumerate(nulls_map)
)
else:
if nulls_map is None:
return tuple(fromts(item / scale) for item in items)
else:
return tuple(
(None if is_null else fromts(items[i] / scale))
for i, is_null in enumerate(nulls_map)
)
else:
if nulls_map is None:
return tuple(fromts(item / scale, tz) for item in items)
else:
return tuple(
(None if is_null else fromts(items[i] / scale, tz))
for i, is_null in enumerate(nulls_map)
)
def before_write_items(self, items, nulls_map=None):
scale = 10 ** self.scale
frac_scale = 10 ** (self.max_scale - self.scale)
timezone = self.timezone
null_value = self.null_value
to_timestamp = datetime.timestamp
for i, item in enumerate(items):
if nulls_map and nulls_map[i]:
items[i] = null_value
continue
if isinstance(item, int):
# support supplying raw integers to avoid
# costly timezone conversions when using datetime
continue
if timezone:
# Set server's timezone for offset-naive datetime.
if item.tzinfo is None:
item = timezone.localize(item)
item = item.astimezone(utc)
else:
# If datetime is offset-aware use it's timezone.
if item.tzinfo is not None:
item = item.astimezone(utc)
items[i] = (
int(to_timestamp(item)) * scale +
int(item.microsecond / frac_scale)
)
def create_datetime_column(spec, column_options):
if spec.startswith('DateTime64'):
cls = DateTime64Column
spec = spec[11:-1]
params = spec.split(',', 1)
column_options['scale'] = int(params[0])
if len(params) > 1:
spec = params[1].strip() + ')'
else:
cls = DateTimeColumn
spec = spec[9:]
context = column_options['context']
tz_name = timezone = None
offset_naive = True
# Use column's timezone if it's specified.
if spec and spec[-1] == ')':
tz_name = spec[1:-2]
offset_naive = False
else:
if not context.settings.get('use_client_time_zone', False):
local_timezone = get_localzone_name_compat()
if local_timezone != context.server_info.timezone:
tz_name = context.server_info.timezone
if tz_name:
timezone = get_timezone(tz_name)
return cls(timezone=timezone, offset_naive=offset_naive, **column_options)
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