Refactor status package to use portbase/runtime.

Refactor the status package to use portbase/runtime and
make system status readonly. Also adapts the code base
to the new portbase/notifications package.

status/mitigation.go

@@ -0,0 +1,60 @@
+package status
+
+import (
+	"sync"
+
+	"github.com/safing/portbase/log"
+)
+
+type knownThreats struct {
+	sync.RWMutex
+	// active threats and their recommended mitigation level
+	list map[string]uint8
+}
+
+var threats = &knownThreats{
+	list: make(map[string]uint8),
+}
+
+// SetMitigationLevel sets the mitigation level for id
+// to mitigation. If mitigation is SecurityLevelOff the
+// mitigation record will be removed. If mitigation is
+// an invalid level the call to SetMitigationLevel is a
+// no-op.
+func SetMitigationLevel(id string, mitigation uint8) {
+	if !IsValidSecurityLevel(mitigation) {
+		log.Warningf("tried to set invalid mitigation level %d for threat %s", mitigation, id)
+		return
+	}
+
+	defer triggerAutopilot()
+
+	threats.Lock()
+	defer threats.Unlock()
+	if mitigation == 0 {
+		delete(threats.list, id)
+	} else {
+		threats.list[id] = mitigation
+	}
+}
+
+// DeleteMitigationLevel deletes the mitigation level for id.
+func DeleteMitigationLevel(id string) {
+	SetMitigationLevel(id, SecurityLevelOff)
+}
+
+// getHighestMitigationLevel returns the highest mitigation
+// level set on a threat.
+func getHighestMitigationLevel() uint8 {
+	threats.RLock()
+	defer threats.RUnlock()
+
+	var level uint8
+	for _, lvl := range threats.list {
+		if lvl > level {
+			level = lvl
+		}
+	}
+
+	return level
+}