As for interface casting
Co-authored-by: Gorbunov Kirill Andreevich <kgorbunov@mtsbank.ru> Reviewed-on: #299 Co-authored-by: Кирилл Горбунов <kirya_gorbunov_2015@mail.ru> Co-committed-by: Кирилл Горбунов <kirya_gorbunov_2015@mail.ru>
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package micro
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import (
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"reflect"
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"go.unistack.org/micro/v3/broker"
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"go.unistack.org/micro/v3/client"
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"go.unistack.org/micro/v3/codec"
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"go.unistack.org/micro/v3/flow"
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"go.unistack.org/micro/v3/fsm"
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"go.unistack.org/micro/v3/logger"
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"go.unistack.org/micro/v3/meter"
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"go.unistack.org/micro/v3/register"
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"go.unistack.org/micro/v3/resolver"
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"go.unistack.org/micro/v3/router"
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"go.unistack.org/micro/v3/selector"
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"go.unistack.org/micro/v3/server"
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"go.unistack.org/micro/v3/store"
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"go.unistack.org/micro/v3/sync"
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"go.unistack.org/micro/v3/tracer"
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)
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func As(b any, target any) bool {
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if b == nil {
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return false
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}
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if target == nil {
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return false
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}
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val := reflect.ValueOf(target)
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typ := val.Type()
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if typ.Kind() != reflect.Ptr || val.IsNil() {
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return false
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}
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targetType := typ.Elem()
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if targetType.Kind() != reflect.Interface {
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switch {
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case targetType.Implements(brokerType):
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break
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case targetType.Implements(loggerType):
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break
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case targetType.Implements(clientType):
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break
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case targetType.Implements(serverType):
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break
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case targetType.Implements(codecType):
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break
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case targetType.Implements(flowType):
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break
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case targetType.Implements(fsmType):
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break
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case targetType.Implements(meterType):
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break
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case targetType.Implements(registerType):
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break
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case targetType.Implements(resolverType):
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break
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case targetType.Implements(selectorType):
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break
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case targetType.Implements(storeType):
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break
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case targetType.Implements(syncType):
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break
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case targetType.Implements(serviceType):
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break
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case targetType.Implements(routerType):
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break
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default:
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return false
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}
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}
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if reflect.TypeOf(b).AssignableTo(targetType) {
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val.Elem().Set(reflect.ValueOf(b))
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return true
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}
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return false
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}
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var brokerType = reflect.TypeOf((*broker.Broker)(nil)).Elem()
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var loggerType = reflect.TypeOf((*logger.Logger)(nil)).Elem()
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var clientType = reflect.TypeOf((*client.Client)(nil)).Elem()
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var serverType = reflect.TypeOf((*server.Server)(nil)).Elem()
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var codecType = reflect.TypeOf((*codec.Codec)(nil)).Elem()
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var flowType = reflect.TypeOf((*flow.Flow)(nil)).Elem()
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var fsmType = reflect.TypeOf((*fsm.FSM)(nil)).Elem()
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var meterType = reflect.TypeOf((*meter.Meter)(nil)).Elem()
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var registerType = reflect.TypeOf((*register.Register)(nil)).Elem()
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var resolverType = reflect.TypeOf((*resolver.Resolver)(nil)).Elem()
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var routerType = reflect.TypeOf((*router.Router)(nil)).Elem()
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var selectorType = reflect.TypeOf((*selector.Selector)(nil)).Elem()
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var storeType = reflect.TypeOf((*store.Store)(nil)).Elem()
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var syncType = reflect.TypeOf((*sync.Sync)(nil)).Elem()
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var tracerType = reflect.TypeOf((*tracer.Tracer)(nil)).Elem()
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var serviceType = reflect.TypeOf((*Service)(nil)).Elem()
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@ -0,0 +1,115 @@
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package micro
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import (
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"context"
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"fmt"
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"reflect"
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"testing"
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"go.unistack.org/micro/v3/broker"
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"go.unistack.org/micro/v3/fsm"
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)
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func TestAs(t *testing.T) {
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var b *bro
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broTarget := &bro{name: "kafka"}
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fsmTarget := &fsmT{name: "fsm"}
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testCases := []struct {
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b any
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target any
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match bool
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want any
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}{
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{
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broTarget,
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&b,
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true,
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broTarget,
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},
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{
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nil,
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&b,
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false,
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nil,
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},
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{
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fsmTarget,
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&b,
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false,
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nil,
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},
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}
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for i, tc := range testCases {
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name := fmt.Sprintf("%d:As(Errorf(..., %v), %v)", i, tc.b, tc.target)
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// Clear the target pointer, in case it was set in a previous test.
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rtarget := reflect.ValueOf(tc.target)
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rtarget.Elem().Set(reflect.Zero(reflect.TypeOf(tc.target).Elem()))
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t.Run(name, func(t *testing.T) {
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match := As(tc.b, tc.target)
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if match != tc.match {
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t.Fatalf("match: got %v; want %v", match, tc.match)
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}
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if !match {
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return
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}
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if got := rtarget.Elem().Interface(); got != tc.want {
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t.Fatalf("got %#v, want %#v", got, tc.want)
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}
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})
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}
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}
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type bro struct {
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name string
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}
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func (p *bro) Name() string { return p.name }
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func (p *bro) Init(opts ...broker.Option) error { return nil }
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// Options returns broker options
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func (p *bro) Options() broker.Options { return broker.Options{} }
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// Address return configured address
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func (p *bro) Address() string { return "" }
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// Connect connects to broker
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func (p *bro) Connect(ctx context.Context) error { return nil }
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// Disconnect disconnect from broker
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func (p *bro) Disconnect(ctx context.Context) error { return nil }
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// Publish message, msg can be single broker.Message or []broker.Message
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func (p *bro) Publish(ctx context.Context, topic string, msg *broker.Message, opts ...broker.PublishOption) error {
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return nil
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}
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// BatchPublish messages to broker with multiple topics
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func (p *bro) BatchPublish(ctx context.Context, msgs []*broker.Message, opts ...broker.PublishOption) error {
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return nil
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}
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// BatchSubscribe subscribes to topic messages via handler
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func (p *bro) BatchSubscribe(ctx context.Context, topic string, h broker.BatchHandler, opts ...broker.SubscribeOption) (broker.Subscriber, error) {
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return nil, nil
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}
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// Subscribe subscribes to topic message via handler
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func (p *bro) Subscribe(ctx context.Context, topic string, handler broker.Handler, opts ...broker.SubscribeOption) (broker.Subscriber, error) {
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return nil, nil
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}
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// String type of broker
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func (p *bro) String() string { return p.name }
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type fsmT struct {
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name string
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}
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func (f *fsmT) Start(ctx context.Context, a interface{}, o ...Option) (interface{}, error) {
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return nil, nil
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}
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func (f *fsmT) Current() string { return f.name }
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func (f *fsmT) Reset() {}
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func (f *fsmT) State(s string, sf fsm.StateFunc) {}
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