153 lines
4.4 KiB
Go
153 lines
4.4 KiB
Go
/*
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Copyright 2026.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// Package instance manages the lifetime and capabilities of external PostgreSQL instances.
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package instance
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import (
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"context"
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"errors"
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"sync"
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api "git.ddupan.top/panxiao81/postgresql-tenant-operator/api/v1alpha1"
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"k8s.io/apimachinery/pkg/types"
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)
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// Credentials are supplied by the credential source, never by the database adapter.
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type Credentials struct{ Username, Password string }
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func (Credentials) String() string { return "[redacted credentials]" }
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func (Credentials) GoString() string { return "[redacted credentials]" }
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// CredentialSource resolves administrative credentials when an Instance is assembled.
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type CredentialSource interface {
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Read(context.Context, api.OpenBaoSecretReference) (Credentials, error)
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}
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// Database exposes the capabilities of an assembled Instance.
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type Database interface {
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Version(context.Context) (string, error)
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EnsureRegistry(context.Context) error
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Close()
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}
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// Connector creates a database without knowing where credentials came from.
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type Connector interface {
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Connect(context.Context, api.PostgreSQLEndpoint, Credentials) (Database, error)
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}
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type identity struct {
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uid types.UID
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endpoint api.PostgreSQLEndpoint
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reference api.OpenBaoSecretReference
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}
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type entry struct {
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identity identity
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credentials *Credentials
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database Database
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}
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// Service owns Instance connections. Reconciles reuse credentials and pools until
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// the UID, endpoint or credential reference changes; allowlist changes do not rotate them.
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// Operations are serialized to prevent Close racing with an active database operation.
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type Service struct {
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mu sync.Mutex
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source CredentialSource
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connector Connector
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entries map[string]*entry
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closed bool
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}
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func NewService(source CredentialSource, connector Connector) *Service {
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return &Service{source: source, connector: connector, entries: make(map[string]*entry)}
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}
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func (s *Service) Validate(ctx context.Context, resource *api.PostgreSQLInstance) (string, error) {
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return s.observe(ctx, resource, false)
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}
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func (s *Service) InitializeRegistry(ctx context.Context, resource *api.PostgreSQLInstance) (string, error) {
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return s.observe(ctx, resource, true)
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}
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func (s *Service) observe(ctx context.Context, resource *api.PostgreSQLInstance, ensureRegistry bool) (string, error) {
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s.mu.Lock()
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defer s.mu.Unlock()
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if s.closed {
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return "", errors.New("instance service is closed")
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}
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db, err := s.database(ctx, resource)
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if err != nil {
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return "", err
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}
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if ensureRegistry {
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if err := db.EnsureRegistry(ctx); err != nil {
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return "", err
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}
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}
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return db.Version(ctx)
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}
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func (s *Service) database(ctx context.Context, resource *api.PostgreSQLInstance) (Database, error) {
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key := identity{uid: resource.UID, endpoint: resource.Spec.Endpoint, reference: resource.Spec.AdminCredentialRef}
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current := s.entries[resource.Name]
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if current == nil || current.identity != key {
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s.release(resource.Name)
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current = &entry{identity: key}
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s.entries[resource.Name] = current
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}
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if current.credentials == nil {
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credentials, err := s.source.Read(ctx, key.reference)
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if err != nil {
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return nil, err
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}
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current.credentials = &credentials
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}
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if current.database == nil {
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database, err := s.connector.Connect(ctx, key.endpoint, *current.credentials)
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if err != nil {
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return nil, err
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}
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current.database = database
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}
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return current.database, nil
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}
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// Forget releases local resources only. It never deletes the external registry.
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func (s *Service) Forget(name string) {
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s.mu.Lock()
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defer s.mu.Unlock()
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s.release(name)
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}
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func (s *Service) release(name string) {
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if current := s.entries[name]; current != nil && current.database != nil {
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current.database.Close()
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}
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delete(s.entries, name)
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}
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// Close is called after manager workers stop, and is safe to repeat.
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func (s *Service) Close() {
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s.mu.Lock()
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defer s.mu.Unlock()
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s.closed = true
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for name := range s.entries {
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s.release(name)
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}
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}
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