Documentation
¶
Overview ¶
Package server is an interface for a micro server.
It represents a server instance in go-micro which handles synchronous requests via handlers and asynchronous requests via subscribers that register with a broker.
The server combines the all the packages in go-micro to create a whole unit used for building applications including discovery, client/server communication and pub/sub.
import "github.com/micro/go-micro/server"
type Greeter struct {}
func (g *Greeter) Hello(ctx context.Context, req *greeter.Request, rsp *greeter.Response) error {
rsp.Msg = "Hello " + req.Name
return nil
}
s := server.NewServer()
s.Handle(
s.NewHandler(&Greeter{}),
)
s.Start()
Index ¶
- Variables
- func Deregister() error
- func Handle(h Handler) error
- func Init(opt ...Option)
- func NewContext(ctx context.Context, s Server) context.Context
- func Register() error
- func Run() error
- func Start() error
- func Stop() error
- func String() string
- func Subscribe(s Subscriber) error
- type Debug
- type Handler
- type HandlerFunc
- type HandlerOption
- type HandlerOptions
- type HandlerWrapper
- type Option
- func Address(a string) Option
- func Advertise(a string) Option
- func Broker(b broker.Broker) Option
- func Codec(contentType string, c codec.NewCodec) Option
- func DebugHandler(d debug.DebugHandler) Option
- func Id(id string) Option
- func Metadata(md map[string]string) Option
- func Name(n string) Option
- func RegisterTTL(t time.Duration) Option
- func Registry(r registry.Registry) Option
- func Transport(t transport.Transport) Option
- func Version(v string) Option
- func WrapHandler(w HandlerWrapper) Option
- func WrapSubscriber(w SubscriberWrapper) Option
- type Options
- type Publication
- type Request
- type Server
- type Streamer
- type StreamerWrapper
- type Subscriber
- type SubscriberFunc
- type SubscriberOption
- type SubscriberOptions
- type SubscriberWrapper
Constants ¶
This section is empty.
Variables ¶
var ( DefaultAddress = ":0" DefaultName = "go-server" DefaultVersion = "1.0.0" DefaultId = uuid.NewUUID().String() DefaultServer Server = newRpcServer() )
Functions ¶
func Deregister ¶
func Deregister() error
Deregister deregisters the default server from the discovery system
func Handle ¶
Handle registers a handler interface with the default server to handle inbound requests
func Register ¶
func Register() error
Register registers the default server with the discovery system
func Run ¶
func Run() error
Run starts the default server and waits for a kill signal before exiting. Also registers/deregisters the server
func Subscribe ¶
func Subscribe(s Subscriber) error
Subscribe registers a subscriber interface with the default server which subscribes to specified topic with the broker
Types ¶
type Debug ¶
type Debug struct {
debug.DebugHandler
}
We use this to wrap any debug handlers so we preserve the signature Debug.{Method}
type Handler ¶
type Handler interface {
Name() string
Handler() interface{}
Endpoints() []*registry.Endpoint
Options() HandlerOptions
}
Handler interface represents a Service request handler. It's generated by passing any type of public concrete object with methods into server.NewHandler. Most will pass in a struct.
Example:
type Service struct {}
func (s *Service) Method(context, request, response) error {
return nil
}
func NewHandler ¶
func NewHandler(h interface{}, opts ...HandlerOption) Handler
NewHandler creates a new handler interface using the default server Handlers are required to be a public object with public methods. Call to a service method such as Foo.Bar expects the type:
type Foo struct {}
func (f *Foo) Bar(ctx, req, rsp) error {
return nil
}
type HandlerFunc ¶
HandlerFunc represents a single method of a handler. It's used primarily for the wrappers. What's handed to the actual method is the concrete request and response types.
type HandlerOption ¶
type HandlerOption func(*HandlerOptions)
func EndpointMetadata ¶
func EndpointMetadata(name string, md map[string]string) HandlerOption
EndpointMetadata is a Handler option that allows metadata to be added to individual endpoints.
func InternalHandler ¶
func InternalHandler(b bool) HandlerOption
Internal Handler options specifies that a handler is not advertised to the discovery system. In the future this may also limit request to the internal network or authorised user.
type HandlerOptions ¶
type HandlerWrapper ¶
type HandlerWrapper func(HandlerFunc) HandlerFunc
HandlerWrapper wraps the HandlerFunc and returns the equivalent
type Option ¶
type Option func(*Options)
func WrapHandler ¶
func WrapHandler(w HandlerWrapper) Option
Adds a handler Wrapper to a list of options passed into the server
func WrapSubscriber ¶
func WrapSubscriber(w SubscriberWrapper) Option
Adds a subscriber Wrapper to a list of options passed into the server
type Options ¶
type Options struct {
Codecs map[string]codec.NewCodec
Broker broker.Broker
Registry registry.Registry
Transport transport.Transport
Metadata map[string]string
Name string
Address string
Advertise string
Id string
Version string
HdlrWrappers []HandlerWrapper
SubWrappers []SubscriberWrapper
RegisterTTL time.Duration
// Debug Handler which can be set by a user
DebugHandler debug.DebugHandler
// Other options for implementations of the interface
// can be stored in a context
Context context.Context
}
func DefaultOptions ¶
func DefaultOptions() Options
DefaultOptions returns config options for the default service
type Publication ¶
type Server ¶
type Server interface {
Options() Options
Init(...Option) error
Handle(Handler) error
NewHandler(interface{}, ...HandlerOption) Handler
NewSubscriber(string, interface{}, ...SubscriberOption) Subscriber
Subscribe(Subscriber) error
Register() error
Deregister() error
Start() error
Stop() error
String() string
}
type Streamer ¶
type Streamer interface {
Context() context.Context
Request() Request
Send(interface{}) error
Recv(interface{}) error
Error() error
Close() error
}
Streamer represents a stream established with a client. A stream can be bidirectional which is indicated by the request. The last error will be left in Error(). EOF indicated end of the stream.
type StreamerWrapper ¶
StreamerWrapper wraps a Streamer interface and returns the equivalent. Because streams exist for the lifetime of a method invocation this is a convenient way to wrap a Stream as its in use for trace, monitoring, metrics, etc.
type Subscriber ¶
type Subscriber interface {
Topic() string
Subscriber() interface{}
Endpoints() []*registry.Endpoint
Options() SubscriberOptions
}
Subscriber interface represents a subscription to a given topic using a specific subscriber function or object with methods.
func NewSubscriber ¶
func NewSubscriber(topic string, h interface{}, opts ...SubscriberOption) Subscriber
NewSubscriber creates a new subscriber interface with the given topic and handler using the default server
type SubscriberFunc ¶
type SubscriberFunc func(ctx context.Context, msg Publication) error
SubscriberFunc represents a single method of a subscriber. It's used primarily for the wrappers. What's handed to the actual method is the concrete publication message.
type SubscriberOption ¶
type SubscriberOption func(*SubscriberOptions)
func InternalSubscriber ¶
func InternalSubscriber(b bool) SubscriberOption
Internal Subscriber options specifies that a subscriber is not advertised to the discovery system.
func SubscriberQueue ¶
func SubscriberQueue(n string) SubscriberOption
Shared queue name distributed messages across subscribers
type SubscriberOptions ¶
type SubscriberWrapper ¶
type SubscriberWrapper func(SubscriberFunc) SubscriberFunc
SubscriberWrapper wraps the SubscriberFunc and returns the equivalent
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