Move selector to client/selector

client/selector/options.go

@@ -0,0 +1,60 @@
+package selector
+
+import (
+	"context"
+
+	"github.com/micro/go-micro/registry"
+)
+
+type Options struct {
+	Registry registry.Registry
+	Strategy Strategy
+
+	// Other options for implementations of the interface
+	// can be stored in a context
+	Context context.Context
+}
+
+type SelectOptions struct {
+	Filters  []Filter
+	Strategy Strategy
+
+	// Other options for implementations of the interface
+	// can be stored in a context
+	Context context.Context
+}
+
+// Option used to initialise the selector
+type Option func(*Options)
+
+// SelectOption used when making a select call
+type SelectOption func(*SelectOptions)
+
+// Registry sets the registry used by the selector
+func Registry(r registry.Registry) Option {
+	return func(o *Options) {
+		o.Registry = r
+	}
+}
+
+// SetStrategy sets the default strategy for the selector
+func SetStrategy(fn Strategy) Option {
+	return func(o *Options) {
+		o.Strategy = fn
+	}
+}
+
+// WithFilter adds a filter function to the list of filters
+// used during the Select call.
+func WithFilter(fn ...Filter) SelectOption {
+	return func(o *SelectOptions) {
+		o.Filters = append(o.Filters, fn...)
+	}
+}
+
+// Strategy sets the selector strategy
+func WithStrategy(fn Strategy) SelectOption {
+	return func(o *SelectOptions) {
+		o.Strategy = fn
+	}
+}