def cached_time_series(identifier, start, end):
"""
Cached time series
"""
def time_series_key(identifier, start, end):
return str(hash(('ts::%s::%s:%s' % (
str(identifier), start, end)).replace(' ', '_')))
cache_key = time_series_key(identifier, start, end)
ts = cache.get(cache_key)
if ts is None:
# Actually fetching time series
source_name = identifier['fews_norm_source_slug']
source = FewsNormSource.objects.get(slug=source_name)
params = {}
if 'geo_ident' in identifier:
params['location'] = identifier['geo_ident']
if 'par_ident' in identifier:
params['parameter'] = identifier['par_ident']
if 'mod_ident' in identifier:
params['moduleinstance'] = identifier['mod_ident']
if 'stp_ident' in identifier:
params['timestep'] = identifier['stp_ident']
if 'qua_ident' in identifier and identifier['qua_ident']:
params['qualifierset'] = identifier['qua_ident']
series = Series.from_raw(
schema_prefix=source.database_schema_name,
params=params).using(source.database_name)
ts = Event.time_series(source, series, start, end)
cache.set(cache_key, ts)
return ts
def time_series(
self, series=None, dt_start=None, dt_end=None, with_comments=False):
"""
Return dictionary of timeseries.
Low level fewsnorm stuff.
Keys are (location, parameter), value is timeseries object.
1) which series
2) retrieve events (with comments) for each series
Note: with_comments does nothing anymore, comments are always
returned. The option is still there for compatibility.
"""
if not series:
series = self.series()
source = self.fews_norm_source
events = Event.time_series(source, series, dt_start, dt_end)
return events
