add datatypes module and fix some naming

datatypes/emergency_contact.go

@@ -0,0 +1,25 @@
+package datatypes
+
+// HeartbeatType are Moira's special internal types of problems.
+type HeartbeatType string
+
+const (
+	HearbeatTypeNotSet   HeartbeatType = "type_not_set"
+	HeartbeatNotifierOff HeartbeatType = "notifier_off"
+)
+
+// IsValid checks if such an heartbeat type exists.
+func (heartbeatType HeartbeatType) IsValid() bool {
+	switch heartbeatType {
+	case HeartbeatNotifierOff:
+		return true
+	default:
+		return false
+	}
+}
+
+// EmergencyContact is the structure for contacts to which notifications will go in the event of special internal Moira problems.
+type EmergencyContact struct {
+	ContactID      string
+	HeartbeatTypes []HeartbeatType
+}

datatypes/emergency_contact_test.go

@@ -0,0 +1,32 @@
+package datatypes
+
+import (
+	"testing"
+
+	. "github.com/smartystreets/goconvey/convey"
+)
+
+func TestIsValidHeartbeatType(t *testing.T) {
+	Convey("Test IsValid heartbeat type", t, func() {
+		Convey("Test valid cases", func() {
+			testcases := []HeartbeatType{
+				HeartbeatNotifierOff,
+			}
+
+			for _, testcase := range testcases {
+				So(testcase.IsValid(), ShouldBeTrue)
+			}
+		})
+
+		Convey("Test invalid cases", func() {
+			testcases := []HeartbeatType{
+				"notifier_on",
+				"checker_off",
+			}
+
+			for _, testcase := range testcases {
+				So(testcase.IsValid(), ShouldBeFalse)
+			}
+		})
+	})
+}