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Rewrite prune_old_outbound_device_pokes for efficiency (#7159)

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make sure we clear out all but one update for the user
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Richard van der Hoff 2020-03-30 19:06:52 +01:00 • committed by GitHub
parent 7042840b32
commit 7966a1cde9
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5 changed files with 173 additions and 37 deletions
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21
synapse/util/stringutils.py
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@ -13,10 +13,11 @@
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import itertools
import random
import re
import string
from collections import Iterable
import six
from six import PY2, PY3
@ -126,3 +127,21 @@ def assert_valid_client_secret(client_secret):
raise SynapseError(
400, "Invalid client_secret parameter", errcode=Codes.INVALID_PARAM
)
def shortstr(iterable: Iterable, maxitems: int = 5) -> str:
"""If iterable has maxitems or fewer, return the stringification of a list
containing those items.
Otherwise, return the stringification of a a list with the first maxitems items,
followed by "...".
Args:
iterable: iterable to truncate
maxitems: number of items to return before truncating
"""
items = list(itertools.islice(iterable, maxitems + 1))
if len(items) <= maxitems:
return str(items)
return "[" + ", ".join(repr(r) for r in items[:maxitems]) + ", ...]"