131 lines
3.3 KiB
Go
131 lines
3.3 KiB
Go
// redka 内嵌 Redis 兼容存储实现（v0.2.x API）
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// 使用 github.com/nalgeon/redka — 基于 SQLite 的 Redis 替代方案 // Logan.Li
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// 零外部依赖，数据存在本地文件中，非常适合独立二进制部署
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package redis
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import (
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"context"
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"fmt"
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"os"
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"path/filepath"
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"time"
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"github.com/nalgeon/redka"
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_ "github.com/mattn/go-sqlite3" // redka.Open 需要 database/sql 驱动名 sqlite3 // Logan.Li
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)
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// redkaCache 基于 Redka v0.2.x 的缓存实现 // Logan.Li
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type redkaCache struct {
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db *redka.DB
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}
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func newRedka(cfg Config) (Cache, error) {
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// redka.db 与独立二进制同级存放 // Logan.Li
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dataDir := cfg.DataDir
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if dataDir == "" {
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dataDir = "."
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}
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if err := os.MkdirAll(dataDir, 0o755); err != nil {
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return nil, fmt.Errorf("redka: 创建数据目录失败: %w", err)
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}
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dbPath := filepath.Join(dataDir, "redka.db")
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db, err := redka.Open(dbPath, nil)
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if err != nil {
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return nil, err
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}
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return &redkaCache{db: db}, nil
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}
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func (r *redkaCache) Capabilities() Capabilities {
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return Capabilities{SortedSet: false, PubSub: false}
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}
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func (r *redkaCache) Get(ctx context.Context, key string) (string, error) {
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// Redka v0.2.x: Str().Get() 返回 core.Value // Logan.Li
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val, err := r.db.Str().Get(key)
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if err == redka.ErrNotFound {
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return "", nil
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}
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if err != nil {
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return "", err
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}
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return val.String(), nil
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}
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func (r *redkaCache) Set(ctx context.Context, key string, value string, expiration time.Duration) error {
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// Redka v0.2.x: Str().Set() 返回 error // Logan.Li
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if err := r.db.Str().Set(key, value); err != nil {
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return err
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}
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if expiration > 0 {
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_, err := r.db.Key().Expire(key, expiration)
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return err
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}
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return nil
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}
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func (r *redkaCache) Del(ctx context.Context, keys ...string) error {
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for _, key := range keys {
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if _, err := r.db.Key().Delete(key); err != nil {
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return err
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}
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}
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return nil
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}
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func (r *redkaCache) Exists(ctx context.Context, keys ...string) (int64, error) {
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var count int64
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for _, key := range keys {
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ok, err := r.db.Key().Exists(key)
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if err != nil {
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return 0, err
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}
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if ok {
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count++
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}
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}
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return count, nil
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}
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func (r *redkaCache) Expire(ctx context.Context, key string, expiration time.Duration) error {
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ok, err := r.db.Key().Expire(key, expiration)
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if err != nil {
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return err
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}
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if !ok {
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return redka.ErrNotFound
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}
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return nil
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}
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func (r *redkaCache) Ping(ctx context.Context) error {
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// Redka 始终可用（内嵌数据库）// Logan.Li
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return nil
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}
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func (r *redkaCache) Close() error {
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return r.db.Close()
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}
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var errSortedSetNotSupported = fmt.Errorf("sorted set operations are not supported by the redka backend; use go-redis (driver=redis) instead")
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func (r *redkaCache) ZAdd(ctx context.Context, key string, member SortedSetMember) error {
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return errSortedSetNotSupported
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}
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func (r *redkaCache) ZRangeByScore(ctx context.Context, key string, min, max string) ([]SortedSetMember, error) {
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return nil, errSortedSetNotSupported
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}
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func (r *redkaCache) ZRemRangeByScore(ctx context.Context, key string, min, max string) error {
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return errSortedSetNotSupported
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}
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var errPubSubNotSupported = fmt.Errorf("Pub/Sub is not supported by the redka backend; use go-redis (driver=redis)")
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func (r *redkaCache) Publish(ctx context.Context, channel string, message string) error {
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// local/redka 无 Pub/Sub，流水线日志走轮询 Get，此处 no-op // Logan.Li
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return nil
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}
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