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Change the way pagination works to support out of order events.

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This commit is contained in:
Erik Johnston 2014-08-19 14:19:48 +01:00
parent 1422a22970
commit 598a1d8ff9
8 changed files with 226 additions and 81 deletions
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19
synapse/api/streams/__init__.py
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@ -20,23 +20,23 @@ class PaginationConfig(object):
"""A configuration object which stores pagination parameters."""
def __init__(self, from_tok=None, to_tok=None, limit=0):
def __init__(self, from_tok=None, to_tok=None, direction='f', limit=0):
self.from_tok = from_tok
self.to_tok = to_tok
self.direction = direction
self.limit = limit
@classmethod
def from_request(cls, request, raise_invalid_params=True):
params = {
"from_tok": PaginationStream.TOK_START,
"to_tok": PaginationStream.TOK_END,
"limit": 0
"direction": 'f',
}
query_param_mappings = [ # 3-tuple of qp_key, attribute, rules
("from", "from_tok", lambda x: type(x) == str),
("to", "to_tok", lambda x: type(x) == str),
("limit", "limit", lambda x: x.isdigit())
("limit", "limit", lambda x: x.isdigit()),
("dir", "direction", lambda x: x == 'f' or x == 'b'),
]
for qp, attr, is_valid in query_param_mappings:
@ -48,12 +48,17 @@ class PaginationConfig(object):
return PaginationConfig(**params)
def __str__(self):
return (
"<PaginationConfig from_tok=%s, to_tok=%s, "
"direction=%s, limit=%s>"
) % (self.from_tok, self.to_tok, self.direction, self.limit)
class PaginationStream(object):
""" An interface for streaming data as chunks. """
TOK_START = "START"
TOK_END = "END"
def get_chunk(self, config=None):
@ -76,7 +81,7 @@ class StreamData(object):
self.hs = hs
self.store = hs.get_datastore()
def get_rows(self, user_id, from_pkey, to_pkey, limit):
def get_rows(self, user_id, from_pkey, to_pkey, limit, direction):
""" Get event stream data between the specified pkeys.
Args: