export grpc conn pool

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

grpc.go

@@ -30,7 +30,7 @@ const (
 )
 
 type grpcClient struct {
-	pool *pool
+	pool *ConnPool
 	opts client.Options
 	sync.RWMutex
 	init bool
@@ -133,13 +133,13 @@ func (g *grpcClient) call(ctx context.Context, addr string, req client.Request,
 		grpcDialOptions = append(grpcDialOptions, grpc.WithContextDialer(contextDialer))
 	}
 
-	cc, err := g.pool.getConn(dialCtx, addr, grpcDialOptions...)
+	cc, err := g.pool.Get(dialCtx, addr, grpcDialOptions...)
 	if err != nil {
 		return errors.InternalServerError("go.micro.client", fmt.Sprintf("Error sending request: %v", err))
 	}
 	defer func() {
 		// defer execution of release
-		g.pool.release(cc, grr)
+		g.pool.Put(cc, grr)
 	}()
 
 	ch := make(chan error, 1)
@@ -242,7 +242,7 @@ func (g *grpcClient) stream(ctx context.Context, addr string, req client.Request
 		grpcDialOptions = append(grpcDialOptions, grpc.WithContextDialer(contextDialer))
 	}
 
-	cc, err := g.pool.getConn(dialCtx, addr, grpcDialOptions...)
+	cc, err := g.pool.Get(dialCtx, addr, grpcDialOptions...)
 	if err != nil {
 		return errors.InternalServerError("go.micro.client", fmt.Sprintf("Error sending request: %v", err))
 	}
@@ -275,7 +275,7 @@ func (g *grpcClient) stream(ctx context.Context, addr string, req client.Request
 		// cancel the context
 		cancel()
 		// release the connection
-		g.pool.release(cc, err)
+		g.pool.Put(cc, err)
 		// now return the error
 		return errors.InternalServerError("go.micro.client", fmt.Sprintf("Error creating stream: %v", err))
 	}
@@ -303,7 +303,7 @@ func (g *grpcClient) stream(ctx context.Context, addr string, req client.Request
 			}
 
 			// defer execution of release
-			g.pool.release(cc, err)
+			g.pool.Put(cc, err)
 		},
 	}
 
@@ -833,7 +833,7 @@ func NewClient(opts ...client.Option) client.Client {
 		opts: options,
 	}
 
-	rc.pool = newPool(options.PoolSize, options.PoolTTL, rc.poolMaxIdle(), rc.poolMaxStreams())
+	rc.pool = NewConnPool(options.PoolSize, options.PoolTTL, rc.poolMaxIdle(), rc.poolMaxStreams())
 
 	c := client.Client(rc)
 

grpc_pool.go

@@ -10,7 +10,7 @@ import (
 	"google.golang.org/grpc/connectivity"
 )
 
-type pool struct {
+type ConnPool struct {
 	conns      map[string]*streamsPool
 	size       int
 	ttl        int64
@@ -34,7 +34,7 @@ type poolConn struct {
 	err error
 	*grpc.ClientConn
 	next    *poolConn
-	pool    *pool
+	pool    *ConnPool
 	sp      *streamsPool
 	pre     *poolConn
 	addr    string
@@ -43,14 +43,14 @@ type poolConn struct {
 	in      bool
 }
 
-func newPool(size int, ttl time.Duration, idle int, ms int) *pool {
+func NewConnPool(size int, ttl time.Duration, idle int, ms int) *ConnPool {
 	if ms <= 0 {
 		ms = 1
 	}
 	if idle < 0 {
 		idle = 0
 	}
-	return &pool{
+	return &ConnPool{
 		size:       size,
 		ttl:        int64(ttl.Seconds()),
 		maxStreams: ms,
@@ -59,7 +59,7 @@ func newPool(size int, ttl time.Duration, idle int, ms int) *pool {
 	}
 }
 
-func (p *pool) getConn(ctx context.Context, addr string, opts ...grpc.DialOption) (*poolConn, error) {
+func (p *ConnPool) Get(ctx context.Context, addr string, opts ...grpc.DialOption) (*poolConn, error) {
 	if strings.HasPrefix(addr, "http") {
 		addr = addr[strings.Index(addr, ":")+3:]
 	}
@@ -147,7 +147,7 @@ func (p *pool) getConn(ctx context.Context, addr string, opts ...grpc.DialOption
 	return conn, nil
 }
 
-func (p *pool) release(conn *poolConn, err error) {
+func (p *ConnPool) Put(conn *poolConn, err error) {
 	p.Lock()
 	p, sp, created := conn.pool, conn.sp, conn.created
 	//  try to add conn
@@ -183,7 +183,7 @@ func (p *pool) release(conn *poolConn, err error) {
 }
 
 func (conn *poolConn) Close() {
-	conn.pool.release(conn, conn.err)
+	conn.pool.Put(conn, conn.err)
 }
 
 func removeConn(conn *poolConn) {