"""
This program is free software: you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License,
or (at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>.
Copyright © 2019 Cloud Linux Software Inc.
This software is also available under ImunifyAV commercial license,
see <https://www.imunify360.com/legal/eula>
"""
import sqlite3
# Smallest SQLITE_MAX_VARIABLE_NUMBER any supported build ships with; safe
# floor when the real per-connection limit cannot be queried.
# https://www.sqlite.org/limits.html#max_variable_number
CONSERVATIVE_VARIABLE_LIMIT = 999
def sqlite_max_variable_number(database) -> int:
# The effective cap is the linked build's compile/runtime
# SQLITE_MAX_VARIABLE_NUMBER, not the library version — some builds run a
# recent SQLite yet still cap at 999, so probe the live connection.
# Best-effort: any probe failure must degrade to the safe floor, never
# propagate, otherwise the probe itself would break the caller's write.
try:
limit = database.connection().getlimit(
sqlite3.SQLITE_LIMIT_VARIABLE_NUMBER
)
except Exception:
return CONSERVATIVE_VARIABLE_LIMIT
return limit if limit > 0 else CONSERVATIVE_VARIABLE_LIMIT
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