refactor: 按 phase handler 组织状态机

internal/controller/postgresqlinstance_state_machine.go

@@ -0,0 +1,73 @@
+/*
+Copyright 2026.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package controller
+
+import databasev1alpha1 "git.ddupan.top/panxiao81/postgresql-tenant-operator/api/v1alpha1"
+
+type instancePhaseResult struct {
+	phase              databasev1alpha1.PostgreSQLInstancePhase
+	reconcilingMessage string
+}
+
+type instancePhaseHandler func(*databasev1alpha1.PostgreSQLInstance) instancePhaseResult
+
+type instanceStateMachine struct {
+	handlers map[databasev1alpha1.PostgreSQLInstancePhase]instancePhaseHandler
+}
+
+func newInstanceStateMachine() instanceStateMachine {
+	return instanceStateMachine{handlers: map[databasev1alpha1.PostgreSQLInstancePhase]instancePhaseHandler{
+		databasev1alpha1.PostgreSQLInstancePhasePending:              reconcileInstancePending,
+		databasev1alpha1.PostgreSQLInstancePhaseValidating:           keepInstancePhase,
+		databasev1alpha1.PostgreSQLInstancePhaseInitializingRegistry: keepInstancePhase,
+		databasev1alpha1.PostgreSQLInstancePhaseReady:                keepInstancePhase,
+		databasev1alpha1.PostgreSQLInstancePhaseDeleting:             reconcileInstanceDeleting,
+	}}
+}
+
+func (m instanceStateMachine) reconcile(instance *databasev1alpha1.PostgreSQLInstance) instancePhaseResult {
+	phase := instance.Status.Phase
+	if !instance.DeletionTimestamp.IsZero() {
+		phase = databasev1alpha1.PostgreSQLInstancePhaseDeleting
+	} else if phase == "" {
+		phase = databasev1alpha1.PostgreSQLInstancePhasePending
+	}
+
+	handler, found := m.handlers[phase]
+	if !found {
+		return instancePhaseResult{phase: phase}
+	}
+	return handler(instance)
+}
+
+func reconcileInstancePending(*databasev1alpha1.PostgreSQLInstance) instancePhaseResult {
+	return instancePhaseResult{
+		phase:              databasev1alpha1.PostgreSQLInstancePhaseValidating,
+		reconcilingMessage: "instance dependencies are being validated",
+	}
+}
+
+func reconcileInstanceDeleting(*databasev1alpha1.PostgreSQLInstance) instancePhaseResult {
+	return instancePhaseResult{
+		phase:              databasev1alpha1.PostgreSQLInstancePhaseDeleting,
+		reconcilingMessage: "instance deletion is reconciling",
+	}
+}
+
+func keepInstancePhase(instance *databasev1alpha1.PostgreSQLInstance) instancePhaseResult {
+	return instancePhaseResult{phase: instance.Status.Phase}
+}