Moving to gRPC by default (#1069)

* Step 1

* Fix the test panics

grpc.go

@@ -12,12 +12,10 @@ import (
 	"github.com/micro/go-micro/broker"
 	"github.com/micro/go-micro/client"
 	"github.com/micro/go-micro/client/selector"
-	"github.com/micro/go-micro/codec"
 	raw "github.com/micro/go-micro/codec/bytes"
 	"github.com/micro/go-micro/errors"
 	"github.com/micro/go-micro/metadata"
 	"github.com/micro/go-micro/registry"
-	"github.com/micro/go-micro/transport"
 
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/credentials"
@@ -623,45 +621,19 @@ func (g *grpcClient) getGrpcCallOptions() []grpc.CallOption {
 }
 
 func newClient(opts ...client.Option) client.Client {
-	options := client.Options{
+	options := client.NewOptions()
-		Codecs: make(map[string]codec.NewCodec),
+	// default content type for grpc
-		CallOptions: client.CallOptions{
+	options.ContentType = "application/grpc+proto"
-			Backoff:        client.DefaultBackoff,
-			Retry:          client.DefaultRetry,
-			Retries:        client.DefaultRetries,
-			RequestTimeout: client.DefaultRequestTimeout,
-			DialTimeout:    transport.DefaultDialTimeout,
-		},
-		PoolSize: client.DefaultPoolSize,
-		PoolTTL:  client.DefaultPoolTTL,
-	}
 
 	for _, o := range opts {
 		o(&options)
 	}
 
-	if len(options.ContentType) == 0 {
-		options.ContentType = "application/grpc+proto"
-	}
-
-	if options.Broker == nil {
-		options.Broker = broker.DefaultBroker
-	}
-
-	if options.Registry == nil {
-		options.Registry = registry.DefaultRegistry
-	}
-
-	if options.Selector == nil {
-		options.Selector = selector.NewSelector(
-			selector.Registry(options.Registry),
-		)
-	}
-
 	rc := &grpcClient{
 		once: sync.Once{},
 		opts: options,
 	}
+
 	rc.pool = newPool(options.PoolSize, options.PoolTTL, rc.poolMaxIdle(), rc.poolMaxStreams())
 
 	c := client.Client(rc)

grpc_pool.go

@@ -70,7 +70,7 @@ func (p *pool) getConn(addr string, opts ...grpc.DialOption) (*poolConn, error)
 	p.Lock()
 	sp, ok := p.conns[addr]
 	if !ok {
-		sp = &streamsPool{head:&poolConn{}, busy:&poolConn{}, count:0, idle:0}
+		sp = &streamsPool{head: &poolConn{}, busy: &poolConn{}, count: 0, idle: 0}
 		p.conns[addr] = sp
 	}
 	//  while we have conns check streams and then return one
@@ -112,7 +112,7 @@ func (p *pool) getConn(addr string, opts ...grpc.DialOption) (*poolConn, error)
 	if err != nil {
 		return nil, err
 	}
-	conn = &poolConn{cc,nil,addr,p,sp,1,time.Now().Unix(), nil, nil, false}
+	conn = &poolConn{cc, nil, addr, p, sp, 1, time.Now().Unix(), nil, nil, false}
 
 	//  add conn to streams pool
 	p.Lock()
@@ -160,7 +160,7 @@ func (p *pool) release(addr string, conn *poolConn, err error) {
 	return
 }
 
-func (conn *poolConn)Close()  {
+func (conn *poolConn) Close() {
 	conn.pool.release(conn.addr, conn, conn.err)
 }
 

options.go

@@ -28,8 +28,8 @@ var (
 	DefaultMaxSendMsgSize = 1024 * 1024 * 4
 )
 
-type poolMaxStreams struct {}
+type poolMaxStreams struct{}
-type poolMaxIdle struct {}
+type poolMaxIdle struct{}
 type codecsKey struct{}
 type tlsAuth struct{}
 type maxRecvMsgSizeKey struct{}