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/export_test.go

@@ -14,16 +14,16 @@ import (
 )
 
 // NewTestServer creates a Server suitable for testing, whose
-// connections use interval and deadline in place of
-// pingInterval and pongDeadline, and resolve in place of
-// resolveHost.
+// connections use interval, deadline and poll in place of
+// pingInterval, pongDeadline and pollInterval, and resolve in
+// place of resolveHost.
 // The caller must call Stop() when finished.
 func NewTestServer(
 	log *slog.Logger,
 	cfg *config.Config,
 	database *db.Database,
 	brk *broker.Broker,
-	interval, deadline time.Duration,
+	interval, deadline, poll time.Duration,
 	resolve func(ctx context.Context, addr string) string,
 ) *Server {
 	globs := &globals.Globals{
@@ -46,10 +46,18 @@ func NewTestServer(
 
 		pingInterval: interval,
 		pongDeadline: deadline,
+		pollInterval: poll,
+		stopTimeout:  stopTimeout,
 		resolveHost:  resolve,
 	}
 }
 
+// SetStopTimeout makes Stop wait at most timeout for the
+// connections' cleanup.
+func (s *Server) SetStopTimeout(timeout time.Duration) {
+	s.stopTimeout = timeout
+}
+
 // ResolveHost is the reverse DNS lookup that a server made by
 // New does for each client.
 func ResolveHost(ctx context.Context, addr string) string {
@@ -99,10 +107,6 @@ const PingInterval = pingInterval
 // for a line before it closes the connection.
 const PongDeadline = pongDeadline
 
-// StopTimeout is the longest Stop waits for the connections'
-// cleanup.
-const StopTimeout = stopTimeout
-
 // NewTestConn returns a Conn for nick on tcpConn, without a
 // server, database or service behind it.
 func NewTestConn(
@@ -111,7 +115,7 @@ func NewTestConn(
 	tcpConn net.Conn,
 	nick string,
 ) *Conn {
-	conn := newConn(tcpConn, log, nil, nil, cfg, nil)
+	conn := newConn(tcpConn, log, nil, nil, cfg, nil, pollInterval)
 	conn.nick = nick
 
 	return conn