cluster history api endpoint

pkg/controller/controller.go

@@ -32,10 +32,11 @@ type Controller struct {
 
 	stopCh chan struct{}
 
-	clustersMu   sync.RWMutex
-	clusters     map[spec.NamespacedName]*cluster.Cluster
-	clusterLogs  map[spec.NamespacedName]ringlog.RingLogger
-	teamClusters map[string][]spec.NamespacedName
+	clustersMu     sync.RWMutex
+	clusters       map[spec.NamespacedName]*cluster.Cluster
+	clusterLogs    map[spec.NamespacedName]ringlog.RingLogger
+	clusterHistory map[spec.NamespacedName]ringlog.RingLogger // history of the cluster changes
+	teamClusters   map[string][]spec.NamespacedName
 
 	postgresqlInformer cache.SharedIndexInformer
 	podInformer        cache.SharedIndexInformer
@@ -52,14 +53,15 @@ func NewController(controllerConfig *spec.ControllerConfig) *Controller {
 	logger := logrus.New()
 
 	c := &Controller{
-		config:       *controllerConfig,
-		opConfig:     &config.Config{},
-		logger:       logger.WithField("pkg", "controller"),
-		clusters:     make(map[spec.NamespacedName]*cluster.Cluster),
-		clusterLogs:  make(map[spec.NamespacedName]ringlog.RingLogger),
-		teamClusters: make(map[string][]spec.NamespacedName),
-		stopCh:       make(chan struct{}),
-		podCh:        make(chan spec.PodEvent),
+		config:         *controllerConfig,
+		opConfig:       &config.Config{},
+		logger:         logger.WithField("pkg", "controller"),
+		clusters:       make(map[spec.NamespacedName]*cluster.Cluster),
+		clusterLogs:    make(map[spec.NamespacedName]ringlog.RingLogger),
+		clusterHistory: make(map[spec.NamespacedName]ringlog.RingLogger),
+		teamClusters:   make(map[string][]spec.NamespacedName),
+		stopCh:         make(chan struct{}),
+		podCh:          make(chan spec.PodEvent),
 	}
 	logger.Hooks.Add(c)
 

pkg/controller/postgresql.go

@@ -138,12 +138,14 @@ func (c *Controller) addCluster(lg *logrus.Entry, clusterName spec.NamespacedNam
 	c.teamClusters[teamName] = append(c.teamClusters[teamName], clusterName)
 	c.clusters[clusterName] = cl
 	c.clusterLogs[clusterName] = ringlog.New(c.opConfig.RingLogLines)
+	c.clusterHistory[clusterName] = ringlog.New(c.opConfig.ClusterHistoryEntries)
 
 	return cl
 }
 
 func (c *Controller) processEvent(event spec.ClusterEvent) {
 	var clusterName spec.NamespacedName
+	var clHistory ringlog.RingLogger
 
 	lg := c.logger.WithField("worker", event.WorkerID)
 
@@ -156,6 +158,9 @@ func (c *Controller) processEvent(event spec.ClusterEvent) {
 
 	c.clustersMu.RLock()
 	cl, clusterFound := c.clusters[clusterName]
+	if clusterFound {
+		clHistory = c.clusterHistory[clusterName]
+	}
 	c.clustersMu.RUnlock()
 
 	switch event.EventType {
@@ -192,6 +197,12 @@ func (c *Controller) processEvent(event spec.ClusterEvent) {
 		}
 		cl.Error = nil
 		lg.Infoln("cluster has been updated")
+
+		clHistory.Insert(&spec.Diff{
+			EventTime:   event.EventTime,
+			ProcessTime: time.Now(),
+			Diff:        util.Diff(event.OldSpec, event.NewSpec),
+		})
 	case spec.EventDelete:
 		if !clusterFound {
 			lg.Errorf("unknown cluster: %q", clusterName)
@@ -211,6 +222,7 @@ func (c *Controller) processEvent(event spec.ClusterEvent) {
 
 			delete(c.clusters, clusterName)
 			delete(c.clusterLogs, clusterName)
+			delete(c.clusterHistory, clusterName)
 			for i, val := range c.teamClusters[teamName] {
 				if val == clusterName {
 					copy(c.teamClusters[teamName][i:], c.teamClusters[teamName][i+1:])

pkg/controller/status.go

@@ -166,3 +166,25 @@ func (c *Controller) ListQueue(workerID uint32) (*spec.QueueDump, error) {
 func (c *Controller) GetWorkersCnt() uint32 {
 	return c.opConfig.Workers
 }
+
+// ClusterHistory dumps history of cluster changes
+func (c *Controller) ClusterHistory(team, name string) ([]*spec.Diff, error) {
+	clusterName := spec.NamespacedName{
+		Namespace: c.opConfig.Namespace,
+		Name:      team + "-" + name,
+	}
+
+	c.clustersMu.RLock()
+	cl, ok := c.clusterHistory[clusterName]
+	c.clustersMu.RUnlock()
+	if !ok {
+		return nil, fmt.Errorf("could not find cluster")
+	}
+
+	res := make([]*spec.Diff, 0)
+	for _, e := range cl.Walk() {
+		res = append(res, e.(*spec.Diff))
+	}
+
+	return res, nil
+}