add using lazy connect (#361)

#357

Co-authored-by: Василий Толстов <v.tolstov@unistack.org>
Reviewed-on: #361
Reviewed-by: Василий Толстов <v.tolstov@unistack.org>
Co-authored-by: Evstigneev Denis <danteevstigneev@yandex.ru>
Co-committed-by: Evstigneev Denis <danteevstigneev@yandex.ru>

store/memory/memory.go

@@ -4,6 +4,7 @@ import (
 	"context"
 	"sort"
 	"strings"
+	"sync/atomic"
 	"time"
 
 	cache "github.com/patrickmn/go-cache"
@@ -20,7 +21,10 @@ func NewStore(opts ...store.Option) store.Store {
 }
 
 func (m *memoryStore) Connect(ctx context.Context) error {
-	return nil
+	if m.opts.LazyConnect {
+		return nil
+	}
+	return m.connect(ctx)
 }
 
 func (m *memoryStore) Disconnect(ctx context.Context) error {
@@ -29,13 +33,14 @@ func (m *memoryStore) Disconnect(ctx context.Context) error {
 }
 
 type memoryStore struct {
-	funcRead   store.FuncRead
-	funcWrite  store.FuncWrite
-	funcExists store.FuncExists
-	funcList   store.FuncList
-	funcDelete store.FuncDelete
-	store      *cache.Cache
-	opts       store.Options
+	funcRead    store.FuncRead
+	funcWrite   store.FuncWrite
+	funcExists  store.FuncExists
+	funcList    store.FuncList
+	funcDelete  store.FuncDelete
+	store       *cache.Cache
+	opts        store.Options
+	isConnected atomic.Int32
 }
 
 func (m *memoryStore) key(prefix, key string) string {
@@ -145,6 +150,11 @@ 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 +167,11 @@ 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 +184,11 @@ 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 +213,11 @@ 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 +236,11 @@ 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 +274,8 @@ func (m *memoryStore) fnList(ctx context.Context, opts ...store.ListOption) ([]s
 
 	return keys, nil
 }
+
+func (m *memoryStore) connect(ctx context.Context) error {
+	m.isConnected.CompareAndSwap(0, 1)
+	return nil
+}

store/noop.go

@@ -2,6 +2,7 @@ package store
 
 import (
 	"context"
+	"sync/atomic"
 
 	"go.unistack.org/micro/v3/options"
 )
@@ -9,12 +10,13 @@ import (
 var _ Store = (*noopStore)(nil)
 
 type noopStore struct {
-	funcRead   FuncRead
-	funcWrite  FuncWrite
-	funcExists FuncExists
-	funcList   FuncList
-	funcDelete FuncDelete
-	opts       Options
+	funcRead    FuncRead
+	funcWrite   FuncWrite
+	funcExists  FuncExists
+	funcList    FuncList
+	funcDelete  FuncDelete
+	opts        Options
+	isConnected atomic.Int32
 }
 
 func NewStore(opts ...Option) *noopStore {
@@ -52,12 +54,10 @@ func (n *noopStore) Init(opts ...Option) error {
 }
 
 func (n *noopStore) Connect(ctx context.Context) error {
-	select {
-	case <-ctx.Done():
-		return ctx.Err()
-	default:
+	if n.opts.LazyConnect {
+		return nil
 	}
-	return nil
+	return n.connect(ctx)
 }
 
 func (n *noopStore) Disconnect(ctx context.Context) error {
@@ -70,6 +70,11 @@ 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 +88,11 @@ 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 +106,11 @@ 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 +124,11 @@ 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 +142,11 @@ 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 +170,15 @@ func (n *noopStore) String() string {
 func (n *noopStore) Options() Options {
 	return n.opts
 }
+
+func (n *noopStore) connect(ctx context.Context) error {
+	if n.isConnected.CompareAndSwap(0, 1) {
+		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