Add gossip registry

options.go

@@ -0,0 +1,58 @@
+package gossip
+
+import (
+	"context"
+	"time"
+
+	"github.com/hashicorp/memberlist"
+	"github.com/micro/go-micro/registry"
+)
+
+type secretKey struct{}
+type addressKey struct{}
+type configKey struct{}
+type advertiseKey struct{}
+type connectTimeoutKey struct{}
+type connectRetryKey struct{}
+
+// helper for setting registry options
+func setRegistryOption(k, v interface{}) registry.Option {
+	return func(o *registry.Options) {
+		if o.Context == nil {
+			o.Context = context.Background()
+		}
+		o.Context = context.WithValue(o.Context, k, v)
+	}
+}
+
+// Secret specifies an encryption key. The value should be either
+// 16, 24, or 32 bytes to select AES-128, AES-192, or AES-256.
+func Secret(k []byte) registry.Option {
+	return setRegistryOption(secretKey{}, k)
+}
+
+// Address to bind to - host:port
+func Address(a string) registry.Option {
+	return setRegistryOption(addressKey{}, a)
+}
+
+// Config sets *memberlist.Config for configuring gossip
+func Config(c *memberlist.Config) registry.Option {
+	return setRegistryOption(configKey{}, c)
+}
+
+// The address to advertise for other gossip members to connect to - host:port
+func Advertise(a string) registry.Option {
+	return setRegistryOption(advertiseKey{}, a)
+}
+
+// ConnectTimeout sets the registry connect timeout. Use -1 to specify infinite timeout
+func ConnectTimeout(td time.Duration) registry.Option {
+	return setRegistryOption(connectTimeoutKey{}, td)
+}
+
+// ConnectRetry enables reconnect to registry then connection closed,
+// use with ConnectTimeout to specify how long retry
+func ConnectRetry(v bool) registry.Option {
+	return setRegistryOption(connectRetryKey{}, v)
+}