refactor: 按 phase handler 组织状态机

internal/controller/postgresqltenant_state_machine.go

@@ -0,0 +1,77 @@
+/*
+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 tenantPhaseResult struct {
+	phase              databasev1alpha1.PostgreSQLTenantPhase
+	reconcilingMessage string
+}
+
+type tenantPhaseHandler func(*databasev1alpha1.PostgreSQLTenant) tenantPhaseResult
+
+type tenantStateMachine struct {
+	handlers map[databasev1alpha1.PostgreSQLTenantPhase]tenantPhaseHandler
+}
+
+func newTenantStateMachine() tenantStateMachine {
+	return tenantStateMachine{handlers: map[databasev1alpha1.PostgreSQLTenantPhase]tenantPhaseHandler{
+		databasev1alpha1.PostgreSQLTenantPhasePending:               reconcileTenantPending,
+		databasev1alpha1.PostgreSQLTenantPhasePlanned:               keepTenantPhase,
+		databasev1alpha1.PostgreSQLTenantPhaseCredentialCreated:     keepTenantPhase,
+		databasev1alpha1.PostgreSQLTenantPhaseRoleCreated:           keepTenantPhase,
+		databasev1alpha1.PostgreSQLTenantPhaseDatabaseCreated:       keepTenantPhase,
+		databasev1alpha1.PostgreSQLTenantPhaseExternalSecretCreated: keepTenantPhase,
+		databasev1alpha1.PostgreSQLTenantPhaseCredentialProjected:   keepTenantPhase,
+		databasev1alpha1.PostgreSQLTenantPhaseReady:                 keepTenantPhase,
+		databasev1alpha1.PostgreSQLTenantPhaseDeleting:              reconcileTenantDeleting,
+	}}
+}
+
+func (m tenantStateMachine) reconcile(tenant *databasev1alpha1.PostgreSQLTenant) tenantPhaseResult {
+	phase := tenant.Status.Phase
+	if !tenant.DeletionTimestamp.IsZero() {
+		phase = databasev1alpha1.PostgreSQLTenantPhaseDeleting
+	} else if phase == "" {
+		phase = databasev1alpha1.PostgreSQLTenantPhasePending
+	}
+
+	handler, found := m.handlers[phase]
+	if !found {
+		return tenantPhaseResult{phase: phase}
+	}
+	return handler(tenant)
+}
+
+func reconcileTenantPending(*databasev1alpha1.PostgreSQLTenant) tenantPhaseResult {
+	return tenantPhaseResult{
+		phase:              databasev1alpha1.PostgreSQLTenantPhasePending,
+		reconcilingMessage: "tenant is waiting for its instance",
+	}
+}
+
+func reconcileTenantDeleting(*databasev1alpha1.PostgreSQLTenant) tenantPhaseResult {
+	return tenantPhaseResult{
+		phase:              databasev1alpha1.PostgreSQLTenantPhaseDeleting,
+		reconcilingMessage: "tenant deletion is reconciling",
+	}
+}
+
+func keepTenantPhase(tenant *databasev1alpha1.PostgreSQLTenant) tenantPhaseResult {
+	return tenantPhaseResult{phase: tenant.Status.Phase}
+}