replace wrappers with hooks

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

store/memory/memory.go

@@ -0,0 +1,246 @@
+package memory
+
+import (
+	"context"
+	"sort"
+	"strings"
+	"time"
+
+	cache "github.com/patrickmn/go-cache"
+	"go.unistack.org/micro/v3/options"
+	"go.unistack.org/micro/v3/store"
+)
+
+// NewStore returns a memory store
+func NewStore(opts ...store.Option) store.Store {
+	return &memoryStore{
+		opts:  store.NewOptions(opts...),
+		store: cache.New(cache.NoExpiration, 5*time.Minute),
+	}
+}
+
+func (m *memoryStore) Connect(ctx context.Context) error {
+	return nil
+}
+
+func (m *memoryStore) Disconnect(ctx context.Context) error {
+	m.store.Flush()
+	return nil
+}
+
+type memoryStore struct {
+	funcRead   store.FuncRead
+	funcWrite  store.FuncWrite
+	funcExists store.FuncExists
+	funcList   store.FuncList
+	funcDelete store.FuncDelete
+	store      *cache.Cache
+	opts       store.Options
+}
+
+func (m *memoryStore) key(prefix, key string) string {
+	return prefix + m.opts.Separator + key
+}
+
+func (m *memoryStore) exists(prefix, key string) error {
+	key = m.key(prefix, key)
+	_, found := m.store.Get(key)
+	if !found {
+		return store.ErrNotFound
+	}
+
+	return nil
+}
+
+func (m *memoryStore) get(prefix, key string, val interface{}) error {
+	key = m.key(prefix, key)
+
+	r, found := m.store.Get(key)
+	if !found {
+		return store.ErrNotFound
+	}
+
+	buf, ok := r.([]byte)
+	if !ok {
+		return store.ErrNotFound
+	}
+
+	return m.opts.Codec.Unmarshal(buf, val)
+}
+
+func (m *memoryStore) delete(prefix, key string) {
+	key = m.key(prefix, key)
+	m.store.Delete(key)
+}
+
+func (m *memoryStore) list(prefix string, limit, offset uint) []string {
+	allItems := m.store.Items()
+	allKeys := make([]string, 0, len(allItems))
+
+	for k := range allItems {
+		if !strings.HasPrefix(k, prefix) {
+			continue
+		}
+		k = strings.TrimPrefix(k, prefix)
+		if k[0] == '/' {
+			k = k[1:]
+		}
+		allKeys = append(allKeys, k)
+	}
+
+	if limit != 0 || offset != 0 {
+		sort.Slice(allKeys, func(i, j int) bool { return allKeys[i] < allKeys[j] })
+		sort.Slice(allKeys, func(i, j int) bool { return allKeys[i] < allKeys[j] })
+		end := len(allKeys)
+		if limit > 0 {
+			calcLimit := int(offset + limit)
+			if calcLimit < end {
+				end = calcLimit
+			}
+		}
+
+		if int(offset) >= end {
+			return nil
+		}
+		return allKeys[offset:end]
+	}
+	return allKeys
+}
+
+func (m *memoryStore) Init(opts ...store.Option) error {
+	for _, o := range opts {
+		o(&m.opts)
+	}
+
+	m.funcRead = m.fnRead
+	m.funcWrite = m.fnWrite
+	m.funcExists = m.fnExists
+	m.funcList = m.fnList
+	m.funcDelete = m.fnDelete
+
+	m.opts.Hooks.EachNext(func(hook options.Hook) {
+		switch h := hook.(type) {
+		case store.HookRead:
+			m.funcRead = h(m.funcRead)
+		case store.HookWrite:
+			m.funcWrite = h(m.funcWrite)
+		case store.HookExists:
+			m.funcExists = h(m.funcExists)
+		case store.HookList:
+			m.funcList = h(m.funcList)
+		case store.HookDelete:
+			m.funcDelete = h(m.funcDelete)
+		}
+	})
+
+	return nil
+}
+
+func (m *memoryStore) String() string {
+	return "memory"
+}
+
+func (m *memoryStore) Name() string {
+	return m.opts.Name
+}
+
+func (m *memoryStore) Exists(ctx context.Context, key string, opts ...store.ExistsOption) error {
+	return m.funcExists(ctx, key, opts...)
+}
+
+func (m *memoryStore) fnExists(ctx context.Context, key string, opts ...store.ExistsOption) error {
+	options := store.NewExistsOptions(opts...)
+	if options.Namespace == "" {
+		options.Namespace = m.opts.Namespace
+	}
+	return m.exists(options.Namespace, key)
+}
+
+func (m *memoryStore) Read(ctx context.Context, key string, val interface{}, opts ...store.ReadOption) error {
+	return m.funcRead(ctx, key, val, opts...)
+}
+
+func (m *memoryStore) fnRead(ctx context.Context, key string, val interface{}, opts ...store.ReadOption) error {
+	options := store.NewReadOptions(opts...)
+	if options.Namespace == "" {
+		options.Namespace = m.opts.Namespace
+	}
+	return m.get(options.Namespace, key, val)
+}
+
+func (m *memoryStore) Write(ctx context.Context, key string, val interface{}, opts ...store.WriteOption) error {
+	return m.funcWrite(ctx, key, val, opts...)
+}
+
+func (m *memoryStore) fnWrite(ctx context.Context, key string, val interface{}, opts ...store.WriteOption) error {
+	options := store.NewWriteOptions(opts...)
+	if options.Namespace == "" {
+		options.Namespace = m.opts.Namespace
+	}
+	if options.TTL == 0 {
+		options.TTL = cache.NoExpiration
+	}
+
+	key = m.key(options.Namespace, key)
+
+	buf, err := m.opts.Codec.Marshal(val)
+	if err != nil {
+		return err
+	}
+
+	m.store.Set(key, buf, options.TTL)
+	return nil
+}
+
+func (m *memoryStore) Delete(ctx context.Context, key string, opts ...store.DeleteOption) error {
+	return m.funcDelete(ctx, key, opts...)
+}
+
+func (m *memoryStore) fnDelete(ctx context.Context, key string, opts ...store.DeleteOption) error {
+	options := store.NewDeleteOptions(opts...)
+	if options.Namespace == "" {
+		options.Namespace = m.opts.Namespace
+	}
+
+	m.delete(options.Namespace, key)
+	return nil
+}
+
+func (m *memoryStore) Options() store.Options {
+	return m.opts
+}
+
+func (m *memoryStore) List(ctx context.Context, opts ...store.ListOption) ([]string, error) {
+	return m.funcList(ctx, opts...)
+}
+
+func (m *memoryStore) fnList(ctx context.Context, opts ...store.ListOption) ([]string, error) {
+	options := store.NewListOptions(opts...)
+	if options.Namespace == "" {
+		options.Namespace = m.opts.Namespace
+	}
+
+	keys := m.list(options.Namespace, options.Limit, options.Offset)
+
+	if len(options.Prefix) > 0 {
+		var prefixKeys []string
+		for _, k := range keys {
+			if strings.HasPrefix(k, options.Prefix) {
+				prefixKeys = append(prefixKeys, k)
+			}
+		}
+		keys = prefixKeys
+	}
+
+	if len(options.Suffix) > 0 {
+		var suffixKeys []string
+		for _, k := range keys {
+			if strings.HasSuffix(k, options.Suffix) {
+				suffixKeys = append(suffixKeys, k)
+			}
+		}
+		keys = suffixKeys
+	}
+
+	return keys, nil
+}