Vasiliy Tolstov
06136312bb
* regen files with never protoc * rewrite import path Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>
129 lines
3.3 KiB
Go
129 lines
3.3 KiB
Go
package cache
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import (
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"github.com/unistack-org/micro/v3/store"
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"github.com/unistack-org/micro/v3/store/memory"
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)
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// cache store is a store with caching to reduce IO where applicable.
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// A memory store is used to cache reads from the given backing store.
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// Reads are read through, writes are write-through
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type cache struct {
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m store.Store // the memory store
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b store.Store // the backing store, could be file, cockroach etc
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options store.Options
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}
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// NewStore returns a new cache store
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func NewStore(store store.Store, opts ...store.Option) store.Store {
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cf := &cache{
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m: memory.NewStore(opts...),
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b: store,
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}
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return cf
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}
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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.options)
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}
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return nil
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}
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// Init initialises the underlying stores
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func (c *cache) Init(opts ...store.Option) error {
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if err := c.init(opts...); err != nil {
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return err
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}
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if err := c.m.Init(opts...); err != nil {
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return err
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}
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return c.b.Init(opts...)
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}
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// Options allows you to view the current options.
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func (c *cache) Options() store.Options {
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return c.options
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}
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// Read takes a single key name and optional ReadOptions. It returns matching []*Record or an error.
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func (c *cache) Read(key string, opts ...store.ReadOption) ([]*store.Record, error) {
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recs, err := c.m.Read(key, opts...)
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if err != nil && err != store.ErrNotFound {
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return nil, err
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}
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if len(recs) > 0 {
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return recs, nil
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}
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recs, err = c.b.Read(key, opts...)
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if err == nil {
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for _, rec := range recs {
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if err := c.m.Write(rec); err != nil {
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return nil, err
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}
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}
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}
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return recs, err
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}
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// Write() writes a record to the store, and returns an error if the record was not written.
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// If the write succeeds in writing to memory but fails to write through to file, you'll receive an error
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// but the value may still reside in memory so appropriate action should be taken.
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func (c *cache) Write(r *store.Record, opts ...store.WriteOption) error {
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if err := c.m.Write(r, opts...); err != nil {
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return err
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}
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return c.b.Write(r, opts...)
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}
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// Delete removes the record with the corresponding key from the store.
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// If the delete succeeds in writing to memory but fails to write through to file, you'll receive an error
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// but the value may still reside in memory so appropriate action should be taken.
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func (c *cache) Delete(key string, opts ...store.DeleteOption) error {
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if err := c.m.Delete(key, opts...); err != nil {
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return err
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}
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return c.b.Delete(key, opts...)
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}
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// List returns any keys that match, or an empty list with no error if none matched.
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func (c *cache) List(opts ...store.ListOption) ([]string, error) {
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keys, err := c.m.List(opts...)
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if err != nil && err != store.ErrNotFound {
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return nil, err
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}
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if len(keys) > 0 {
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return keys, nil
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}
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keys, err = c.b.List(opts...)
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if err == nil {
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for _, key := range keys {
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recs, err := c.b.Read(key)
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if err != nil {
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return nil, err
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}
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for _, r := range recs {
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if err := c.m.Write(r); err != nil {
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return nil, err
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}
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}
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}
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}
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return keys, err
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}
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// Close the store and the underlying store
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func (c *cache) Close() error {
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if err := c.m.Close(); err != nil {
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return err
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}
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return c.b.Close()
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}
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// String returns the name of the implementation.
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func (c *cache) String() string {
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return "cache"
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}
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