This changeset enables declaring the `stream` config value as a factory
method. Providing a much more flexible control of the socket connection.
Defining a custom `stream` config value allows the postgres driver to
support a larger variety of environments/setups such as proxy servers
and secure socket connections that are used by cloud providers such as
GCP.
Currently, usage of the `stream` config value is only viable for single
connections given that it's only possible to define a single socket
stream instance per new Client/Pool instance. By adding support to a
factory function, it becomes possible to enable usage of custom socket
streams for connection pools.
For reference, see the `mysql2` driver for MySQL (linked below) for
prior art example of this pattern.
Refs: ba15fe2570/lib/connection.js (L63-L65)
Refs: https://cloud.google.com/sql/docs/postgres/connect-overview
Signed-off-by: Ruy Adorno <ruyadorno@google.com>
Signed-off-by: Ruy Adorno <ruyadorno@google.com>
Replaces __dirname concatentation in pg test scripts so that editors like
VS Code can automatically generate typings and support code navigation (F12).
This switches the internals to use faster protocol parsing & serializing. This results in a significant (30% - 50%) speed up in some common query patterns. There is quite a bit more performance work I need to do, but this takes care of some initial stuff & removes a big fork in the code.
The `readyState` of a newly-created `net.Socket` changed from `'closed'` to `'open'` in Node 14.0.0, so this makes the JS driver work on Node 14.
`Connection` now always calls `connect` on its `stream` when `connect` is called on it.
