add non-http stress test

14s writes on sqlite comparted to 4s writes on postgresql

sub 100ms read on sqlite comparted to sub 200ms reads on postgresql

using pool size = 20

50 users each sending 100 appointments

(pool size = 1 on sqlite results in 11s writes and sub 200ms reads)

teos/Cargo.toml

@@ -14,6 +14,10 @@ path = "src/cli.rs"
 name = "teosd"
 path = "src/main.rs"
 
+[[bin]]
+name = "stress"
+path = "src/stress.rs"
+
 [features]
 # By default, enable both SQLite snd PostgreSQL in the output binary.
 default = ["sqlite", "postgres"]

teos/src/gatekeeper.rs

@@ -44,13 +44,13 @@ pub(crate) struct AuthenticationFailure<'a>(&'a str);
 
 /// Error raised if the user subscription has not enough slots to fit a new appointment.
 #[derive(Debug, PartialEq)]
-pub(crate) struct NotEnoughSlots;
+pub struct NotEnoughSlots;
 
 /// Error raised if the user subscription slots limit has been reached.
 ///
 /// This is currently set to [u32::MAX].
 #[derive(Debug, PartialEq)]
-pub(crate) struct MaxSlotsReached;
+pub struct MaxSlotsReached;
 
 /// Component in charge of managing access to the tower resources.
 ///

teos/src/responder.rs

@@ -67,7 +67,7 @@ impl ConfirmationStatus {
 ///
 /// It is analogous to [ExtendedAppointment](crate::extended_appointment::ExtendedAppointment) for the [`Watcher`](crate::watcher::Watcher).
 #[derive(Debug, Clone, PartialEq, Eq)]
-pub(crate) struct TransactionTracker {
+pub struct TransactionTracker {
     /// Matches the corresponding [Breach] `dispute_tx` field.
     pub dispute_tx: Transaction,
     /// Matches the corresponding [Breach] penalty_tx field.