fix type assertion problem from viper, add sensor name to messages

core/Box.go

@@ -19,10 +19,10 @@ const (
 type checkType = struct{ description string }
 
 var checkTypes = map[string]checkType{
-	eventMeasurementAge:       checkType{"No measurement from %s since %s"},
-	eventMeasurementValMin:    checkType{"Sensor %s reads low value of %s"},
-	eventMeasurementValMax:    checkType{"Sensor %s reads high value of %s"},
-	eventMeasurementValFaulty: checkType{"Sensor %s reads presumably faulty value of %s"},
+	eventMeasurementAge:       checkType{"No measurement from %s (%s) since %s"},
+	eventMeasurementValMin:    checkType{"Sensor %s (%s) reads low value of %s"},
+	eventMeasurementValMax:    checkType{"Sensor %s (%s) reads high value of %s"},
+	eventMeasurementValFaulty: checkType{"Sensor %s (%s) reads presumably faulty value of %s"},
 }
 
 type FaultyValue struct {
@@ -58,6 +58,7 @@ type Box struct {
 	Name    string `json:"name"`
 	Sensors []struct {
 		Id              string `json:"_id"`
+		Phenomenon      string `json:"title"`
 		Type            string `json:"sensorType"`
 		LastMeasurement *struct {
 			Value string    `json:"value"`
@@ -81,6 +82,7 @@ func (box Box) RunChecks() ([]CheckResult, error) {
 			var (
 				status     = CheckOk
 				target     = s.Id
+				targetName = s.Phenomenon
 				value      string
 			)
 
@@ -133,6 +135,7 @@ func (box Box) RunChecks() ([]CheckResult, error) {
 					Threshold:  event.Threshold,
 					Event:      event.Type,
 					Target:     target,
+					TargetName: targetName,
 					Value:      value,
 					Status:     status,
 				})

core/BoxCheckResults.go

@@ -13,6 +13,7 @@ type CheckResult struct {
 	Status     string
 	Event      string
 	Target     string
+	TargetName string
 	Value      string
 	Threshold  string
 }
@@ -26,9 +27,9 @@ func (r CheckResult) EventID() string {
 
 func (r CheckResult) String() string {
 	if r.Status == CheckOk {
-		return fmt.Sprintf("%s %s (on sensor %s with value %s)\n", r.Event, r.Status, r.Target, r.Value)
+		return fmt.Sprintf("%s %s (on sensor %s (%s) with value %s)\n", r.Event, r.Status, r.TargetName, r.Target, r.Value)
 	} else {
-		return fmt.Sprintf("%s: "+checkTypes[r.Event].description+"\n", r.Status, r.Target, r.Value)
+		return fmt.Sprintf("%s: "+checkTypes[r.Event].description+"\n", r.Status, r.TargetName, r.Target, r.Value)
 	}
 }
 
@@ -69,6 +70,7 @@ func (results BoxCheckResults) Log() {
 }
 
 func (results BoxCheckResults) SendNotifications() error {
+	// FIXME: don't return on errors, process all boxes first!
 	results = results.FilterChangedFromCache(false)
 
 	n := results.Size()

core/notifiers.go

@@ -31,14 +31,33 @@ type EmailNotifier struct {
 }
 
 func (n EmailNotifier) New(config interface{}) (AbstractNotifier, error) {
-	res, ok := config.(EmailNotifier)
+	// assign configuration to the notifier after ensuring the correct type.
+	// lesson of this project: golang requires us to fuck around with type
+	// assertions, instead of providing us with proper inheritance.
 
-	if !ok || res.Recipients == nil {
+	asserted, ok := config.(EmailNotifier)
+	if !ok || asserted.Recipients == nil {
+		// config did not contain valid options.
+		// first try fallback: parse result of viper is a map[string]interface{},
+		// which requires a different assertion change
+		asserted2, ok := config.(map[string]interface{})
+		if ok {
+			asserted3, ok := asserted2["recipients"].([]interface{})
+			if ok {
+				asserted = EmailNotifier{Recipients: []string{}}
+				for _, rec := range asserted3 {
+					asserted.Recipients = append(asserted.Recipients, rec.(string))
+				}
+			}
+		}
+
+		if asserted.Recipients == nil {
 			return nil, errors.New("Invalid EmailNotifier options")
 		}
+	}
 
 	return EmailNotifier{
-		Recipients: res.Recipients,
+		Recipients: asserted.Recipients,
 	}, nil
 }