def _make_pending_key_from_key(self, key):
"""
Return the pending_key for a given key. This is used
to route a key into the correct pending buffer. If partitioning
is disabled, route into the no partition buffer.
"""
if self.pending_partitions == 1:
return self.pending_key
return self._make_pending_key(crc32(key) % self.pending_partitions)
def make_counter_key(self, model, rollup, timestamp, key, environment_id):
"""
Make a key that is used for counter values.
Returns a 2-tuple that contains the hash key and the hash field.
"""
model_key = self.get_model_key(key)
if isinstance(model_key, six.integer_types):
vnode = model_key % self.vnodes
else:
vnode = crc32(force_bytes(model_key)) % self.vnodes
return (
u"{prefix}{model}:{epoch}:{vnode}".format(
prefix=self.prefix,
model=model.value,
epoch=self.normalize_to_rollup(timestamp, rollup),
vnode=vnode,
),
self.add_environment_parameter(model_key, environment_id),
)
