#97 add As for Broker.
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parent
bb0c415a77
commit
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34
broker/wrap.go
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34
broker/wrap.go
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package broker
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import (
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"reflect"
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)
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func As(b Broker, 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 && !targetType.Implements(brokerType) {
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return false
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}
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return as(b, val, targetType)
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}
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func as(b Broker, targetVal reflect.Value, targetType reflect.Type) bool {
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if reflect.TypeOf(b).AssignableTo(targetType) {
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targetVal.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)(nil)).Elem()
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83
broker/wrap_test.go
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83
broker/wrap_test.go
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@ -0,0 +1,83 @@
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package broker
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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/v4/options"
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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 ...options.Option) error { return nil }
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// Options returns broker options
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func (p *bro) Options() Options { return 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, msg interface{}, opts ...options.Option) error { return nil }
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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 interface{}, opts ...options.Option) (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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func TestAs(t *testing.T) {
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var b *bro
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broTarget := &bro{name: "kafka"}
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testCases := []struct {
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b Broker
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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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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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