Further consolidate the libraries

options.go

@@ -0,0 +1,113 @@
+package grpc
+
+import (
+	"context"
+	"crypto/tls"
+
+	"github.com/micro/go-micro/broker"
+	"github.com/micro/go-micro/codec"
+	"github.com/micro/go-micro/registry"
+	"github.com/micro/go-micro/server"
+	"github.com/micro/go-micro/server/debug"
+	"github.com/micro/go-micro/transport"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/encoding"
+)
+
+type codecsKey struct{}
+type tlsAuth struct{}
+type maxMsgSizeKey struct{}
+type grpcOptions struct{}
+
+// gRPC Codec to be used to encode/decode requests for a given content type
+func Codec(contentType string, c encoding.Codec) server.Option {
+	return func(o *server.Options) {
+		codecs := make(map[string]encoding.Codec)
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		if v := o.Context.Value(codecsKey{}); v != nil {
+			codecs = v.(map[string]encoding.Codec)
+		}
+		codecs[contentType] = c
+		o.Context = context.WithValue(o.Context, codecsKey{}, codecs)
+	}
+}
+
+// AuthTLS should be used to setup a secure authentication using TLS
+func AuthTLS(t *tls.Config) server.Option {
+	return func(o *server.Options) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, tlsAuth{}, t)
+	}
+}
+
+// Options to be used to configure gRPC options
+func Options(opts ...grpc.ServerOption) server.Option {
+	return func(o *server.Options) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, grpcOptions{}, opts)
+	}
+}
+
+//
+// MaxMsgSize set the maximum message in bytes the server can receive and
+// send.  Default maximum message size is 4 MB.
+//
+func MaxMsgSize(s int) server.Option {
+	return func(o *server.Options) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, maxMsgSizeKey{}, s)
+	}
+}
+
+func newOptions(opt ...server.Option) server.Options {
+	opts := server.Options{
+		Codecs:   make(map[string]codec.NewCodec),
+		Metadata: map[string]string{},
+	}
+
+	for _, o := range opt {
+		o(&opts)
+	}
+
+	if opts.Broker == nil {
+		opts.Broker = broker.DefaultBroker
+	}
+
+	if opts.Registry == nil {
+		opts.Registry = registry.DefaultRegistry
+	}
+
+	if opts.Transport == nil {
+		opts.Transport = transport.DefaultTransport
+	}
+
+	if opts.DebugHandler == nil {
+		opts.DebugHandler = debug.DefaultDebugHandler
+	}
+
+	if len(opts.Address) == 0 {
+		opts.Address = server.DefaultAddress
+	}
+
+	if len(opts.Name) == 0 {
+		opts.Name = server.DefaultName
+	}
+
+	if len(opts.Id) == 0 {
+		opts.Id = server.DefaultId
+	}
+
+	if len(opts.Version) == 0 {
+		opts.Version = server.DefaultVersion
+	}
+
+	return opts
+}