* Add extension support for SQLite
While SQLite supports loading extensions at run-time via either the C
API or the SQL interface, they strongly recommend [1] only enabling the C
API so that SQL injections don't allow attackers to run arbitrary
extension code.
Here we take the most conservative approach, we enable only the C
function, and then only when the user requests extensions be loaded in
their `SqliteConnectOptions`, and disable it again once we're done
loading those requested modules. We don't add any support for loading
extensions via environment variables or connection strings.
Extensions in the options are stored as an IndexMap as the load order
can have side effects, they will be loaded in the order they are
supplied by the caller.
Extensions with custom entry points are supported, but a default API
is exposed as most users will interact with extensions using the
defaults.
[1]: https://sqlite.org/c3ref/enable_load_extension.html
* Add extension testing for SQlite
Extends x.py to download an appropriate shared object file for supported
operating systems, and uses wget to fetch one into the GitHub Actions
context for use by CI.
Overriding LD_LIBRARY_PATH for only this specific DB minimises the
impact on the rest of the suite.
* fix: wait until ready after executing other helper queries while pg quering is executing
Signed-off-by: Atkins Chang <atkinschang@gmail.com>
* fix: use tls parameter for testing target
Signed-off-by: Atkins Chang <atkinschang@gmail.com>
