diff options
Diffstat (limited to 'synapse/storage/registration.py')
| -rw-r--r-- | synapse/storage/registration.py | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/synapse/storage/registration.py b/synapse/storage/registration.py index bd35e19be6..967c732bda 100644 --- a/synapse/storage/registration.py +++ b/synapse/storage/registration.py @@ -13,6 +13,8 @@ # See the License for the specific language governing permissions and # limitations under the License. +import re + from twisted.internet import defer from synapse.api.errors import StoreError, Codes @@ -351,3 +353,37 @@ class RegistrationStore(SQLBaseStore): ret = yield self.runInteraction("count_users", _count_users) defer.returnValue(ret) + + @defer.inlineCallbacks + def find_next_generated_user_id_localpart(self): + """ + Gets the localpart of the next generated user ID. + + Generated user IDs are integers, and we aim for them to be as small as + we can. Unfortunately, it's possible some of them are already taken by + existing users, and there may be gaps in the already taken range. This + function returns the start of the first allocatable gap. This is to + avoid the case of ID 10000000 being pre-allocated, so us wasting the + first (and shortest) many generated user IDs. + """ + def _find_next_generated_user_id(txn): + txn.execute("SELECT name FROM users") + rows = self.cursor_to_dict(txn) + + regex = re.compile("^@(\d+):") + + found = set() + + for r in rows: + user_id = r["name"] + match = regex.search(user_id) + if match: + found.add(int(match.group(1))) + for i in xrange(len(found) + 1): + if i not in found: + return i + + defer.returnValue((yield self.runInteraction( + "find_next_generated_user_id", + _find_next_generated_user_id + ))) |