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