Initial working version

priority.go

@@ -0,0 +1,68 @@
+package journal
+
+// Priority is the "level" or severity of the message.
+type Priority int
+
+const (
+	PriEmerg Priority = iota
+	PriAlert
+	PriCrit
+	PriErr
+	PriWarning
+	PriNotice
+	PriInfo
+	PriDebug
+)
+
+// String returns the same value as Keyword.
+func (pri Priority) String() string {
+	return pri.Keyword()
+}
+
+// Keyword returns a keyword associated with the priority level. These should be
+// recognisable to system operators.
+func (pri Priority) Keyword() string {
+	switch pri {
+	case PriEmerg:
+		return "emerg"
+	case PriAlert:
+		return "alert"
+	case PriCrit:
+		return "crit"
+	case PriErr:
+		return "err"
+	case PriWarning:
+		return "warning"
+	case PriNotice:
+		return "notice"
+	case PriInfo:
+		return "info"
+	case PriDebug:
+		return "debug"
+	default:
+		return "?"
+	}
+}
+
+var priorityAttrKey = AttrKey{key: "PRIORITY"}
+
+var priorityAttrMap = map[Priority]Attr{
+	PriEmerg:   Attr{Key: priorityAttrKey, Value: []byte{'0'}},
+	PriAlert:   Attr{Key: priorityAttrKey, Value: []byte{'1'}},
+	PriCrit:    Attr{Key: priorityAttrKey, Value: []byte{'2'}},
+	PriErr:     Attr{Key: priorityAttrKey, Value: []byte{'3'}},
+	PriWarning: Attr{Key: priorityAttrKey, Value: []byte{'4'}},
+	PriNotice:  Attr{Key: priorityAttrKey, Value: []byte{'5'}},
+	PriInfo:    Attr{Key: priorityAttrKey, Value: []byte{'6'}},
+	PriDebug:   Attr{Key: priorityAttrKey, Value: []byte{'7'}},
+}
+
+var unknownPriorityAttr = Attr{Key: priorityAttrKey, Value: []byte{'6'}}
+
+// Attr returns an attribute value ready to be used in a journal entry.
+func (pri Priority) Attr() Attr {
+	if a, ok := priorityAttrMap[pri]; ok {
+		return a
+	}
+	return unknownPriorityAttr
+}