115 lines
2.8 KiB
Go
115 lines
2.8 KiB
Go
// Package store syncs multiple go-micro stores
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package store
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import (
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"fmt"
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"sync"
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"time"
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"github.com/ef-ds/deque"
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"github.com/micro/go-micro/v2/store"
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"github.com/pkg/errors"
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)
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// Cache implements a cache in front of go-micro Stores
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type Cache interface {
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store.Store
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// Force a full sync
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Sync() error
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}
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type cache struct {
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sOptions store.Options
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cOptions Options
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pendingWrites []*deque.Deque
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pendingWriteTickers []*time.Ticker
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sync.RWMutex
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}
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// NewCache returns a new Cache
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func NewCache(opts ...Option) Cache {
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c := &cache{}
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for _, o := range opts {
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o(&c.cOptions)
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}
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if c.cOptions.SyncInterval == 0 {
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c.cOptions.SyncInterval = 1 * time.Minute
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}
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if c.cOptions.SyncMultiplier == 0 {
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c.cOptions.SyncMultiplier = 5
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}
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return c
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}
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func (c *cache) Close() error {
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return nil
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}
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// Init initialises the storeOptions
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func (c *cache) Init(opts ...store.Option) error {
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for _, o := range opts {
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o(&c.sOptions)
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}
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if len(c.cOptions.Stores) == 0 {
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return errors.New("the cache has no stores")
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}
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if c.sOptions.Context == nil {
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return errors.New("please provide a context to the cache. Cancelling the context signals that the cache is being disposed and syncs the cache")
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}
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for _, s := range c.cOptions.Stores {
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if err := s.Init(); err != nil {
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return errors.Wrapf(err, "Store %s failed to Init()", s.String())
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}
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}
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c.pendingWrites = make([]*deque.Deque, len(c.cOptions.Stores)-1)
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c.pendingWriteTickers = make([]*time.Ticker, len(c.cOptions.Stores)-1)
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for i := 0; i < len(c.pendingWrites); i++ {
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c.pendingWrites[i] = deque.New()
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c.pendingWrites[i].Init()
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c.pendingWriteTickers[i] = time.NewTicker(c.cOptions.SyncInterval * time.Duration(intpow(c.cOptions.SyncMultiplier, int64(i))))
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}
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go c.cacheManager()
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return nil
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}
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// Options returns the cache's store options
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func (c *cache) Options() store.Options {
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return c.sOptions
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}
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// String returns a printable string describing the cache
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func (c *cache) String() string {
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backends := make([]string, len(c.cOptions.Stores))
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for i, s := range c.cOptions.Stores {
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backends[i] = s.String()
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}
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return fmt.Sprintf("cache %v", backends)
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}
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func (c *cache) List(opts ...store.ListOption) ([]string, error) {
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return c.cOptions.Stores[0].List(opts...)
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}
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func (c *cache) Read(key string, opts ...store.ReadOption) ([]*store.Record, error) {
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return c.cOptions.Stores[0].Read(key, opts...)
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}
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func (c *cache) Write(r *store.Record, opts ...store.WriteOption) error {
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return c.cOptions.Stores[0].Write(r, opts...)
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}
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// Delete removes a key from the cache
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func (c *cache) Delete(key string, opts ...store.DeleteOption) error {
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return c.cOptions.Stores[0].Delete(key, opts...)
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}
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func (c *cache) Sync() error {
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return nil
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}
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type internalRecord struct {
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key string
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value []byte
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expiresAt time.Time
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}
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