global: split Akvorado into 3 services

common/daemon/lifecycle.go

@@ -0,0 +1,22 @@
+package daemon
+
+import (
+	"sync"
+)
+
+// lifecycleComponent is the lifecycle part of a component.
+type lifecycleComponent struct {
+	terminateChannel chan struct{}
+	terminateOnce    sync.Once
+}
+
+// Terminated will return a channel that will be closed when the daemon
+// needs to terminate.
+func (c *lifecycleComponent) Terminated() <-chan struct{} {
+	return c.terminateChannel
+}
+
+// Terminate should be called to request termination of a daemon.
+func (c *lifecycleComponent) Terminate() {
+	c.terminateOnce.Do(func() { close(c.terminateChannel) })
+}