succd: split out http server, daemon state, daemon controller

This improves the structure of the code, separating the data/control
interface out and then implementing the http interface as a user of this
interface.

succbone/succd/process_controller.go

@@ -0,0 +1,49 @@
+package main
+
+// daemonController is the control/data interface passed on to external system
+// controllers, eg. the web interface.
+//
+// This is a subset of daemon functions limited to a safe, explicit subset.
+type daemonController interface {
+	// snapshot returns an internally consistent copy of the daemon state.
+	snapshot() *daemonState
+	// rpSet enables/disables the roughing pump.
+	rpSet(bool)
+	// dpSet enables/disables the diffusion pump.
+	dpSet(bool)
+	// pumpDownPress simulates a pumpdown button press.
+	pumpDownPress()
+	// ventPRess simulates a vent button press.
+	ventPress()
+}
+
+func (d *daemon) snapshot() *daemonState {
+	d.mu.RLock()
+	ds := d.daemonState
+	d.mu.RUnlock()
+	return &ds
+}
+
+func (d *daemon) rpSet(state bool) {
+	d.mu.Lock()
+	defer d.mu.Unlock()
+	d.rpOn = state
+}
+
+func (d *daemon) dpSet(state bool) {
+	d.mu.Lock()
+	defer d.mu.Unlock()
+	d.dpOn = state
+}
+
+func (d *daemon) pumpDownPress() {
+	d.mu.Lock()
+	defer d.mu.Unlock()
+	d.pumpdown.trigger()
+}
+
+func (d *daemon) ventPress() {
+	d.mu.Lock()
+	defer d.mu.Unlock()
+	d.vent.trigger()
+}