123 lines
3.2 KiB
Go
123 lines
3.2 KiB
Go
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 ReceiveMatcher struct {
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Arg interface{}
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receivedValue reflect.Value
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channelClosed bool
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}
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func (matcher *ReceiveMatcher) Match(actual interface{}) (success bool, err error) {
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if !isChan(actual) {
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return false, fmt.Errorf("ReceiveMatcher 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.SendDir {
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return false, fmt.Errorf("ReceiveMatcher matcher cannot be passed a send-only channel. Got:\n%s", format.Object(actual, 1))
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}
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var subMatcher omegaMatcher
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var hasSubMatcher bool
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if matcher.Arg != nil {
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subMatcher, hasSubMatcher = (matcher.Arg).(omegaMatcher)
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if !hasSubMatcher {
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argType := reflect.TypeOf(matcher.Arg)
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if argType.Kind() != reflect.Ptr {
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return false, fmt.Errorf("Cannot assign a value from the channel:\n%s\nTo:\n%s\nYou need to pass a pointer!", format.Object(actual, 1), format.Object(matcher.Arg, 1))
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}
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assignable := channelType.Elem().AssignableTo(argType.Elem())
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if !assignable {
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return false, fmt.Errorf("Cannot assign a value from the channel:\n%s\nTo:\n%s", format.Object(actual, 1), format.Object(matcher.Arg, 1))
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}
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}
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}
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winnerIndex, value, open := reflect.Select([]reflect.SelectCase{
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reflect.SelectCase{Dir: reflect.SelectRecv, Chan: channelValue},
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reflect.SelectCase{Dir: reflect.SelectDefault},
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})
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var closed bool
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var didReceive bool
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if winnerIndex == 0 {
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closed = !open
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didReceive = open
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}
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matcher.channelClosed = closed
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if closed {
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return false, nil
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}
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if hasSubMatcher {
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if didReceive {
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matcher.receivedValue = value
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return subMatcher.Match(matcher.receivedValue.Interface())
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}
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return false, nil
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}
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if didReceive {
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if matcher.Arg != nil {
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outValue := reflect.ValueOf(matcher.Arg)
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reflect.Indirect(outValue).Set(value)
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}
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return true, nil
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}
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return false, nil
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}
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func (matcher *ReceiveMatcher) FailureMessage(actual interface{}) (message string) {
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subMatcher, hasSubMatcher := (matcher.Arg).(omegaMatcher)
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closedAddendum := ""
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if matcher.channelClosed {
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closedAddendum = " The channel is closed."
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}
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if hasSubMatcher {
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if matcher.receivedValue.IsValid() {
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return subMatcher.FailureMessage(matcher.receivedValue.Interface())
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}
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return "When passed a matcher, ReceiveMatcher's channel *must* receive something."
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}
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return format.Message(actual, "to receive something."+closedAddendum)
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}
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func (matcher *ReceiveMatcher) NegatedFailureMessage(actual interface{}) (message string) {
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subMatcher, hasSubMatcher := (matcher.Arg).(omegaMatcher)
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closedAddendum := ""
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if matcher.channelClosed {
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closedAddendum = " The channel is closed."
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}
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if hasSubMatcher {
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if matcher.receivedValue.IsValid() {
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return subMatcher.NegatedFailureMessage(matcher.receivedValue.Interface())
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}
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return "When passed a matcher, ReceiveMatcher's channel *must* receive something."
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}
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return format.Message(actual, "not to receive anything."+closedAddendum)
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}
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func (matcher *ReceiveMatcher) 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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