143 lines
3.7 KiB
Go
143 lines
3.7 KiB
Go
/*
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Copyright IBM Corp. All Rights Reserved.
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SPDX-License-Identifier: Apache-2.0
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*/
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package comm_test
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import (
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"os"
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"runtime/pprof"
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"testing"
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"time"
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"github.com/hyperledger/fabric/gossip/comm"
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)
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var matchAnything = func(_ interface{}) bool { return true }
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// fill two channels.
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func TestChannelDeMultiplexer_EvenOddChannels(t *testing.T) {
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demux := comm.NewChannelDemultiplexer()
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evens := demux.AddChannel(func(number interface{}) bool {
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if i, ok := number.(int); ok {
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return i%2 == 0
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}
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return false
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})
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odds := demux.AddChannel(func(number interface{}) bool {
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if i, ok := number.(int); ok {
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return i%2 == 1
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}
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return false
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})
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demux.DeMultiplex("msg") // neither even, nor odd
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for i := 0; i < 20; i++ {
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demux.DeMultiplex(i)
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}
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if len(evens) != 10 || len(odds) != 10 {
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t.Fatalf("filter didn't work, or something got pulled out of the channel buffers, evens:%d, odds:%d", len(evens), len(odds))
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}
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demux.Close()
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demux.Close() // Close is idempotent
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// currently existing channels still work
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for number := range odds {
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if i, ok := number.(int); ok {
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if i%2 != 1 {
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t.Fatal("got an even in my odds")
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}
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}
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}
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for number := range evens {
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if i, ok := number.(int); ok {
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if i%2 != 0 {
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t.Fatal("got an odd in my evens")
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}
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}
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}
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ensureClosedEmptyChannelWithNilReturn(t, evens)
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ensureClosedEmptyChannelWithNilReturn(t, odds)
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}
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func TestChannelDeMultiplexer_OperationsAfterClose(t *testing.T) {
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demux := comm.NewChannelDemultiplexer()
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demux.Close()
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ch := make(chan struct{})
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matcher := func(_ interface{}) bool { ch <- struct{}{}; return true }
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things := demux.AddChannel(matcher)
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// We should get a closed channel
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ensureClosedEmptyChannelWithNilReturn(t, things)
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// demux is closed, so this should exit without attempting a match.
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demux.DeMultiplex("msg")
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ensureClosedEmptyChannelWithNilReturn(t, things)
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select {
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case <-ch:
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t.Fatal("matcher should not have been called")
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default:
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}
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}
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func TestChannelDeMultiplexer_ShouldCloseWithFullChannel(t *testing.T) {
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demux := comm.NewChannelDemultiplexer()
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demux.AddChannel(matchAnything)
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for i := 0; i < 10; i++ {
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demux.DeMultiplex(i)
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}
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// there is no guarantee that the goroutine runs before
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// Close() is called, so if this were to fail, it would be
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// arbitrarily based on the scheduler
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finished := make(chan struct{})
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go func() {
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demux.DeMultiplex(0) // filled channel, but in the background
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close(finished)
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}()
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demux.Close() // does not hang
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select {
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case <-finished: // this forces the goroutine to run to completion
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case <-time.After(time.Second):
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t.Fatal("DeMultiplex should return when demux.Close() is called")
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}
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}
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// run the operations in various orders to make sure there are no
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// missing unlocks that would block anything
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func TestChannelDeMultiplexer_InterleaveOperations(t *testing.T) {
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finished := make(chan struct{})
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go func() {
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demux := comm.NewChannelDemultiplexer()
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demux.AddChannel(matchAnything)
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demux.DeMultiplex("msg")
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demux.AddChannel(matchAnything)
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demux.DeMultiplex("msg")
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demux.Close()
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demux.AddChannel(matchAnything)
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demux.DeMultiplex("msg")
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demux.AddChannel(matchAnything)
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demux.DeMultiplex("msg")
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demux.Close()
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demux.AddChannel(matchAnything)
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demux.DeMultiplex("msg")
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demux.AddChannel(matchAnything)
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demux.DeMultiplex("msg")
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demux.Close()
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close(finished)
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}()
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select {
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case <-time.After(time.Second):
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pprof.Lookup("goroutine").WriteTo(os.Stdout, 1)
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t.Fatal("timed out waiting for operations to complete, may be deadlock")
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case <-finished:
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}
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}
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func ensureClosedEmptyChannelWithNilReturn(t *testing.T, things <-chan interface{}) {
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if thing, openChannel := <-things; openChannel || thing != nil {
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t.Fatalf("channel should be closed and should not get non-nil from closed empty channel")
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}
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}
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