72 lines
1.8 KiB
Go
72 lines
1.8 KiB
Go
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package matchers
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import (
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"fmt"
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"reflect"
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"github.com/onsi/gomega/format"
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)
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type BeSentMatcher struct {
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Arg interface{}
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channelClosed bool
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}
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func (matcher *BeSentMatcher) Match(actual interface{}) (success bool, err error) {
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if !isChan(actual) {
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return false, fmt.Errorf("BeSent expects a channel. Got:\n%s", format.Object(actual, 1))
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}
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channelType := reflect.TypeOf(actual)
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channelValue := reflect.ValueOf(actual)
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if channelType.ChanDir() == reflect.RecvDir {
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return false, fmt.Errorf("BeSent matcher cannot be passed a receive-only channel. Got:\n%s", format.Object(actual, 1))
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}
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argType := reflect.TypeOf(matcher.Arg)
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assignable := argType.AssignableTo(channelType.Elem())
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if !assignable {
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return false, fmt.Errorf("Cannot pass:\n%s to the channel:\n%s\nThe types don't match.", format.Object(matcher.Arg, 1), format.Object(actual, 1))
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}
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argValue := reflect.ValueOf(matcher.Arg)
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defer func() {
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if e := recover(); e != nil {
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success = false
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err = fmt.Errorf("Cannot send to a closed channel")
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matcher.channelClosed = true
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}
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}()
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winnerIndex, _, _ := reflect.Select([]reflect.SelectCase{
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reflect.SelectCase{Dir: reflect.SelectSend, Chan: channelValue, Send: argValue},
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reflect.SelectCase{Dir: reflect.SelectDefault},
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})
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var didSend bool
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if winnerIndex == 0 {
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didSend = true
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}
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return didSend, nil
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}
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func (matcher *BeSentMatcher) FailureMessage(actual interface{}) (message string) {
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return format.Message(actual, "to send:", matcher.Arg)
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}
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func (matcher *BeSentMatcher) NegatedFailureMessage(actual interface{}) (message string) {
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return format.Message(actual, "not to send:", matcher.Arg)
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}
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func (matcher *BeSentMatcher) MatchMayChangeInTheFuture(actual interface{}) bool {
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if !isChan(actual) {
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return false
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}
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return !matcher.channelClosed
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}
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