add using lazy connect

store/memory/memory.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"sort"
 	"strings"
+	"sync"
 	"time"
 
 	cache "github.com/patrickmn/go-cache"
@@ -20,8 +21,11 @@ func NewStore(opts ...store.Option) store.Store {
 }
 
 func (m *memoryStore) Connect(ctx context.Context) error {
+	if m.opts.LazyConnect {
 		return nil
 	}
+	return m.connect(ctx)
+}
 
 func (m *memoryStore) Disconnect(ctx context.Context) error {
 	m.store.Flush()
@@ -36,6 +40,8 @@ type memoryStore struct {
 	funcDelete  store.FuncDelete
 	store       *cache.Cache
 	opts        store.Options
+	isConnected bool
+	mutex       sync.Mutex
 }
 
 func (m *memoryStore) key(prefix, key string) string {
@@ -145,6 +151,11 @@ func (m *memoryStore) Name() string {
 }
 
 func (m *memoryStore) Exists(ctx context.Context, key string, opts ...store.ExistsOption) error {
+	if m.opts.LazyConnect {
+		if err := m.connect(ctx); err != nil {
+			return err
+		}
+	}
 	return m.funcExists(ctx, key, opts...)
 }
 
@@ -157,6 +168,11 @@ func (m *memoryStore) fnExists(ctx context.Context, key string, opts ...store.Ex
 }
 
 func (m *memoryStore) Read(ctx context.Context, key string, val interface{}, opts ...store.ReadOption) error {
+	if m.opts.LazyConnect {
+		if err := m.connect(ctx); err != nil {
+			return err
+		}
+	}
 	return m.funcRead(ctx, key, val, opts...)
 }
 
@@ -169,6 +185,11 @@ func (m *memoryStore) fnRead(ctx context.Context, key string, val interface{}, o
 }
 
 func (m *memoryStore) Write(ctx context.Context, key string, val interface{}, opts ...store.WriteOption) error {
+	if m.opts.LazyConnect {
+		if err := m.connect(ctx); err != nil {
+			return err
+		}
+	}
 	return m.funcWrite(ctx, key, val, opts...)
 }
 
@@ -193,6 +214,11 @@ func (m *memoryStore) fnWrite(ctx context.Context, key string, val interface{},
 }
 
 func (m *memoryStore) Delete(ctx context.Context, key string, opts ...store.DeleteOption) error {
+	if m.opts.LazyConnect {
+		if err := m.connect(ctx); err != nil {
+			return err
+		}
+	}
 	return m.funcDelete(ctx, key, opts...)
 }
 
@@ -211,6 +237,11 @@ func (m *memoryStore) Options() store.Options {
 }
 
 func (m *memoryStore) List(ctx context.Context, opts ...store.ListOption) ([]string, error) {
+	if m.opts.LazyConnect {
+		if err := m.connect(ctx); err != nil {
+			return nil, err
+		}
+	}
 	return m.funcList(ctx, opts...)
 }
 
@@ -244,3 +275,10 @@ func (m *memoryStore) fnList(ctx context.Context, opts ...store.ListOption) ([]s
 
 	return keys, nil
 }
+
+func (m *memoryStore) connect(ctx context.Context) error {
+	m.mutex.Lock()
+	defer m.mutex.Unlock()
+	m.isConnected = true
+	return nil
+}

store/noop.go

@@ -2,6 +2,7 @@ package store
 
 import (
 	"context"
+	"sync"
 
 	"go.unistack.org/micro/v3/options"
 )
@@ -15,6 +16,8 @@ type noopStore struct {
 	funcList    FuncList
 	funcDelete  FuncDelete
 	opts        Options
+	isConnected bool
+	mutex       sync.Mutex
 }
 
 func NewStore(opts ...Option) *noopStore {
@@ -52,13 +55,11 @@ func (n *noopStore) Init(opts ...Option) error {
 }
 
 func (n *noopStore) Connect(ctx context.Context) error {
-	select {
+	if n.opts.LazyConnect {
-	case <-ctx.Done():
-		return ctx.Err()
-	default:
-	}
 		return nil
 	}
+	return n.connect(ctx)
+}
 
 func (n *noopStore) Disconnect(ctx context.Context) error {
 	select {
@@ -70,6 +71,11 @@ func (n *noopStore) Disconnect(ctx context.Context) error {
 }
 
 func (n *noopStore) Read(ctx context.Context, key string, val interface{}, opts ...ReadOption) error {
+	if n.opts.LazyConnect {
+		if err := n.connect(ctx); err != nil {
+			return err
+		}
+	}
 	return n.funcRead(ctx, key, val, opts...)
 }
 
@@ -83,6 +89,11 @@ func (n *noopStore) fnRead(ctx context.Context, key string, val interface{}, opt
 }
 
 func (n *noopStore) Delete(ctx context.Context, key string, opts ...DeleteOption) error {
+	if n.opts.LazyConnect {
+		if err := n.connect(ctx); err != nil {
+			return err
+		}
+	}
 	return n.funcDelete(ctx, key, opts...)
 }
 
@@ -96,6 +107,11 @@ func (n *noopStore) fnDelete(ctx context.Context, key string, opts ...DeleteOpti
 }
 
 func (n *noopStore) Exists(ctx context.Context, key string, opts ...ExistsOption) error {
+	if n.opts.LazyConnect {
+		if err := n.connect(ctx); err != nil {
+			return err
+		}
+	}
 	return n.funcExists(ctx, key, opts...)
 }
 
@@ -109,6 +125,11 @@ func (n *noopStore) fnExists(ctx context.Context, key string, opts ...ExistsOpti
 }
 
 func (n *noopStore) Write(ctx context.Context, key string, val interface{}, opts ...WriteOption) error {
+	if n.opts.LazyConnect {
+		if err := n.connect(ctx); err != nil {
+			return err
+		}
+	}
 	return n.funcWrite(ctx, key, val, opts...)
 }
 
@@ -122,6 +143,11 @@ func (n *noopStore) fnWrite(ctx context.Context, key string, val interface{}, op
 }
 
 func (n *noopStore) List(ctx context.Context, opts ...ListOption) ([]string, error) {
+	if n.opts.LazyConnect {
+		if err := n.connect(ctx); err != nil {
+			return nil, err
+		}
+	}
 	return n.funcList(ctx, opts...)
 }
 
@@ -145,3 +171,18 @@ func (n *noopStore) String() string {
 func (n *noopStore) Options() Options {
 	return n.opts
 }
+
+func (n *noopStore) connect(ctx context.Context) error {
+	n.mutex.Lock()
+	defer n.mutex.Unlock()
+	if n.isConnected {
+		return nil
+	}
+	n.isConnected = true
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	default:
+	}
+	return nil
+}

store/options.go

@@ -41,6 +41,8 @@ type Options struct {
 	Timeout time.Duration
 	// Hooks can be run before/after store Read/List/Write/Exists/Delete
 	Hooks options.Hooks
+	// LazyConnect creates a connection when using store
+	LazyConnect bool
 }
 
 // NewOptions creates options struct