generalize trigger kinds

daemon/job/trigger/manual.go

@@ -0,0 +1,33 @@
+package trigger
+
+import "context"
+
+type Manual struct {
+	id     string
+	signal chan<- struct{}
+}
+
+var _ Trigger = &Manual{}
+
+func NewManual(id string) *Manual {
+	return &Manual{
+		id:     id,
+		signal: nil,
+	}
+}
+
+func (t *Manual) ID() string {
+	return t.id
+}
+
+func (t *Manual) run(ctx context.Context, signal chan<- struct{}) {
+	if t.signal != nil {
+		panic("run must only be called once")
+	}
+	t.signal = signal
+}
+
+// Panics if called before the trigger has been spanwed as part of a `Triggers`.
+func (t *Manual) Fire() {
+	t.signal <- struct{}{}
+}