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@asim @vtolstov @ben-toogood @erikh
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package micro
import (
"context"
"time"
"github.com/micro/cli/v2"
"github.com/micro/go-micro/v2/auth"
"github.com/micro/go-micro/v2/broker"
"github.com/micro/go-micro/v2/client"
"github.com/micro/go-micro/v2/client/selector"
"github.com/micro/go-micro/v2/config/cmd"
"github.com/micro/go-micro/v2/debug/trace"
"github.com/micro/go-micro/v2/registry"
"github.com/micro/go-micro/v2/server"
"github.com/micro/go-micro/v2/transport"
)
// Options for micro service
type Options struct {
Auth auth.Auth
Broker broker.Broker
Cmd cmd.Cmd
Client client.Client
Server server.Server
Registry registry.Registry
Transport transport.Transport
// Before and After funcs
BeforeStart []func() error
BeforeStop []func() error
AfterStart []func() error
AfterStop []func() error
// Other options for implementations of the interface
// can be stored in a context
Context context.Context
Signal bool
}
func newOptions(opts ...Option) Options {
opt := Options{
Auth: auth.DefaultAuth,
Broker: broker.DefaultBroker,
Cmd: cmd.DefaultCmd,
Client: client.DefaultClient,
Server: server.DefaultServer,
Registry: registry.DefaultRegistry,
Transport: transport.DefaultTransport,
Context: context.Background(),
Signal: true,
}
for _, o := range opts {
o(&opt)
}
return opt
}
// Broker to be used for service
func Broker(b broker.Broker) Option {
return func(o *Options) {
o.Broker = b
// Update Client and Server
o.Client.Init(client.Broker(b))
o.Server.Init(server.Broker(b))
}
}
func Cmd(c cmd.Cmd) Option {
return func(o *Options) {
o.Cmd = c
}
}
// Client to be used for service
func Client(c client.Client) Option {
return func(o *Options) {
o.Client = c
}
}
// Context specifies a context for the service.
// Can be used to signal shutdown of the service and for extra option values.
func Context(ctx context.Context) Option {
return func(o *Options) {
o.Context = ctx
}
}
// HandleSignal toggles automatic installation of the signal handler that
// traps TERM, INT, and QUIT. Users of this feature to disable the signal
// handler, should control liveness of the service through the context.
func HandleSignal(b bool) Option {
return func(o *Options) {
o.Signal = b
}
}
// Server to be used for service
func Server(s server.Server) Option {
return func(o *Options) {
o.Server = s
}
}
// Registry sets the registry for the service
// and the underlying components
func Registry(r registry.Registry) Option {
return func(o *Options) {
o.Registry = r
// Update Client and Server
o.Client.Init(client.Registry(r))
o.Server.Init(server.Registry(r))
// Update Broker
o.Broker.Init(broker.Registry(r))
}
}
// Tracer sets the tracer for the service
func Tracer(t trace.Tracer) Option {
return func(o *Options) {
o.Server.Init(server.Tracer(t))
}
}
// Auth sets the auth for the service
func Auth(a auth.Auth) Option {
return func(o *Options) {
o.Auth = a
o.Server.Init(server.Auth(a))
}
}
// Selector sets the selector for the service client
func Selector(s selector.Selector) Option {
return func(o *Options) {
o.Client.Init(client.Selector(s))
}
}
// Transport sets the transport for the service
// and the underlying components
func Transport(t transport.Transport) Option {
return func(o *Options) {
o.Transport = t
// Update Client and Server
o.Client.Init(client.Transport(t))
o.Server.Init(server.Transport(t))
}
}
// Convenience options
// Address sets the address of the server
func Address(addr string) Option {
return func(o *Options) {
o.Server.Init(server.Address(addr))
}
}
// Name of the service
func Name(n string) Option {
return func(o *Options) {
o.Server.Init(server.Name(n))
}
}
// Version of the service
func Version(v string) Option {
return func(o *Options) {
o.Server.Init(server.Version(v))
}
}
// Metadata associated with the service
func Metadata(md map[string]string) Option {
return func(o *Options) {
o.Server.Init(server.Metadata(md))
}
}
// Flags that can be passed to service
func Flags(flags ...cli.Flag) Option {
return func(o *Options) {
o.Cmd.App().Flags = append(o.Cmd.App().Flags, flags...)
}
}
// Action can be used to parse user provided cli options
func Action(a func(*cli.Context) error) Option {
return func(o *Options) {
o.Cmd.App().Action = a
}
}
// RegisterTTL specifies the TTL to use when registering the service
func RegisterTTL(t time.Duration) Option {
return func(o *Options) {
o.Server.Init(server.RegisterTTL(t))
}
}
// RegisterInterval specifies the interval on which to re-register
func RegisterInterval(t time.Duration) Option {
return func(o *Options) {
o.Server.Init(server.RegisterInterval(t))
}
}
// WrapClient is a convenience method for wrapping a Client with
// some middleware component. A list of wrappers can be provided.
// Wrappers are applied in reverse order so the last is executed first.
func WrapClient(w ...client.Wrapper) Option {
return func(o *Options) {
// apply in reverse
for i := len(w); i > 0; i-- {
o.Client = w[i-1](o.Client)
}
}
}
// WrapCall is a convenience method for wrapping a Client CallFunc
func WrapCall(w ...client.CallWrapper) Option {
return func(o *Options) {
o.Client.Init(client.WrapCall(w...))
}
}
// WrapHandler adds a handler Wrapper to a list of options passed into the server
func WrapHandler(w ...server.HandlerWrapper) Option {
return func(o *Options) {
var wrappers []server.Option
for _, wrap := range w {
wrappers = append(wrappers, server.WrapHandler(wrap))
}
// Init once
o.Server.Init(wrappers...)
}
}
// WrapSubscriber adds a subscriber Wrapper to a list of options passed into the server
func WrapSubscriber(w ...server.SubscriberWrapper) Option {
return func(o *Options) {
var wrappers []server.Option
for _, wrap := range w {
wrappers = append(wrappers, server.WrapSubscriber(wrap))
}
// Init once
o.Server.Init(wrappers...)
}
}
// Before and Afters
// BeforeStart run funcs before service starts
func BeforeStart(fn func() error) Option {
return func(o *Options) {
o.BeforeStart = append(o.BeforeStart, fn)
}
}
// BeforeStop run funcs before service stops
func BeforeStop(fn func() error) Option {
return func(o *Options) {
o.BeforeStop = append(o.BeforeStop, fn)
}
}
// AfterStart run funcs after service starts
func AfterStart(fn func() error) Option {
return func(o *Options) {
o.AfterStart = append(o.AfterStart, fn)
}
}
// AfterStop run funcs after service stops
func AfterStop(fn func() error) Option {
return func(o *Options) {
o.AfterStop = append(o.AfterStop, fn)
}
}
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