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go-micro/server/handler.go

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package server
import "context"
type HandlerOption func(*HandlerOptions)
type HandlerOptions struct {
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Metadata map[string]map[string]string
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Internal bool
}
type SubscriberOption func(*SubscriberOptions)
type SubscriberOptions struct {
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Context context.Context
Queue string
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// AutoAck defaults to true. When a handler returns
// with a nil error the message is acked.
AutoAck bool
Internal bool
}
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// EndpointMetadata is a Handler option that allows metadata to be added to
// individual endpoints.
func EndpointMetadata(name string, md map[string]string) HandlerOption {
return func(o *HandlerOptions) {
o.Metadata[name] = md
}
}
// Internal Handler options specifies that a handler is not advertised
// to the discovery system. In the future this may also limit request
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// to the internal network or authorized user.
func InternalHandler(b bool) HandlerOption {
return func(o *HandlerOptions) {
o.Internal = b
}
}
// Internal Subscriber options specifies that a subscriber is not advertised
// to the discovery system.
func InternalSubscriber(b bool) SubscriberOption {
return func(o *SubscriberOptions) {
o.Internal = b
}
}
func NewSubscriberOptions(opts ...SubscriberOption) SubscriberOptions {
opt := SubscriberOptions{
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AutoAck: true,
Context: context.Background(),
}
for _, o := range opts {
o(&opt)
}
return opt
}
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// DisableAutoAck will disable auto acking of messages
// after they have been handled.
func DisableAutoAck() SubscriberOption {
return func(o *SubscriberOptions) {
o.AutoAck = false
}
}
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// Shared queue name distributed messages across subscribers.
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func SubscriberQueue(n string) SubscriberOption {
return func(o *SubscriberOptions) {
o.Queue = n
}
}
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// SubscriberContext set context options to allow broker SubscriberOption passed.
func SubscriberContext(ctx context.Context) SubscriberOption {
return func(o *SubscriberOptions) {
o.Context = ctx
}
}