Stop the slow test packages waiting (closes #263)

The slowest test packages spent their time waiting rather than testing.

db.Params gains an optional PasswordCost (zero means bcrypt.DefaultCost), and the db, ircserver and handlers tests hash at bcrypt.MinCost. A test IRC server's relay checks its queue on broker notification instead of polling. The service and handlers tests build config.Config directly and run in parallel; config exports DefaultTrustedProxies and ParseTrustedProxies for them. Fixed sleeps give way to waits for the event. Production defaults are unchanged.

What still takes time is CPU work under -race or a timeout a test is about.

Model: opus-5-5

internal/ircserver/server.go

@@ -53,6 +53,11 @@ type Server struct {
 	pingInterval time.Duration
 	pongDeadline time.Duration
 
+	// pollInterval and stopTimeout are the constants of the
+	// same names, except in tests, which change them.
+	pollInterval time.Duration
+	stopTimeout  time.Duration
+
 	// resolveHost is the function of the same name, except in
 	// tests, which replace it with one that blocks.
 	resolveHost func(ctx context.Context, addr string) string
@@ -79,6 +84,8 @@ func New(
 
 		pingInterval: pingInterval,
 		pongDeadline: pongDeadline,
+		pollInterval: pollInterval,
+		stopTimeout:  stopTimeout,
 		resolveHost:  resolveHost,
 	}
 
@@ -154,10 +161,10 @@ func (s *Server) stop() {
 
 	select {
 	case <-done:
-	case <-time.After(stopTimeout):
+	case <-time.After(s.stopTimeout):
 		s.log.Error(
 			"irc connections not cleaned up before stop timeout",
-			"timeout", stopTimeout,
+			"timeout", s.stopTimeout,
 		)
 	}
 }
@@ -181,7 +188,7 @@ func (s *Server) acceptLoop(ctx context.Context) {
 
 		client := newConn(
 			tcpConn, s.log,
-			s.database, s.brk, s.cfg, s.svc,
+			s.database, s.brk, s.cfg, s.svc, s.pollInterval,
 		)
 
 		s.mu.Lock()