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p2p/testing: check for all expectations in TestExchanges 

Handle all expectations in ProtocolSession.TestExchanges in any
order that are received.
This commit is contained in:
Janos Guljas 2018-02-12 18:40:25 +01:00
parent 407339085f
commit e07603bbc4
2 changed files with 205 additions and 62 deletions
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188
p2p/testing/protocolsession.go
View File

@ -19,13 +19,17 @@ package testing
import (
"errors"
"fmt"
"sync"
"time"
"github.com/ethereum/go-ethereum/log"
"github.com/ethereum/go-ethereum/p2p"
"github.com/ethereum/go-ethereum/p2p/discover"
"github.com/ethereum/go-ethereum/p2p/simulations/adapters"
)
var errTimedOut = errors.New("timed out")
// ProtocolSession is a quasi simulation of a pivot node running
// a service and a number of dummy peers that can send (trigger) or
// receive (expect) messages
@ -46,6 +50,7 @@ type Exchange struct {
Label string
Triggers []Trigger
Expects []Expect
Timeout time.Duration
}
// Trigger is part of the exchange, incoming message for the pivot node
@ -102,78 +107,147 @@ func (self *ProtocolSession) trigger(trig Trigger) error {
}
// expect checks an expectation of a message sent out by the pivot node
func (self *ProtocolSession) expect(exp Expect) error {
if exp.Msg == nil {
return errors.New("no message to expect")
}
simNode, ok := self.adapter.GetNode(exp.Peer)
if !ok {
return fmt.Errorf("trigger: peer %v does not exist (1- %v)", exp.Peer, len(self.IDs))
}
mockNode, ok := simNode.Services()[0].(*mockNode)
if !ok {
return fmt.Errorf("trigger: peer %v is not a mock", exp.Peer)
func (self *ProtocolSession) expect(exps []Expect) error {
// construct a map of expectations for each node
peerExpects := make(map[discover.NodeID][]Expect)
for _, exp := range exps {
if exp.Msg == nil {
return errors.New("no message to expect")
}
peerExpects[exp.Peer] = append(peerExpects[exp.Peer], exp)
}
// construct a map of mockNodes for each node
mockNodes := make(map[discover.NodeID]*mockNode)
for nodeID := range peerExpects {
simNode, ok := self.adapter.GetNode(nodeID)
if !ok {
return fmt.Errorf("trigger: peer %v does not exist (1- %v)", nodeID, len(self.IDs))
}
mockNode, ok := simNode.Services()[0].(*mockNode)
if !ok {
return fmt.Errorf("trigger: peer %v is not a mock", nodeID)
}
mockNodes[nodeID] = mockNode
}
// done chanell cancels all created goroutines when function returns
done := make(chan struct{})
defer close(done)
// errc catches the first error from
errc := make(chan error)
wg := &sync.WaitGroup{}
wg.Add(len(mockNodes))
for nodeID, mockNode := range mockNodes {
nodeID := nodeID
mockNode := mockNode
go func() {
defer wg.Done()
// Sum all Expect timeouts to give the maximum
// time for all expectations to finish.
// mockNode.Expect checks all received messages against
// a list of expected messages and timeout for each
// of them can not be checked separately.
var t time.Duration
for _, exp := range peerExpects[nodeID] {
if exp.Timeout == time.Duration(0) {
t += 2000 * time.Millisecond
} else {
t += exp.Timeout
}
}
alarm := time.NewTimer(t)
defer alarm.Stop()
// expectErrc is used to check if error returned
// from mockNode.Expect is not nil and to send it to
// errc only in that case.
// done channel will be closed when function
expectErrc := make(chan error)
go func() {
select {
case expectErrc <- mockNode.Expect(peerExpects[nodeID]...):
case <-done:
case <-alarm.C:
}
}()
select {
case err := <-expectErrc:
if err != nil {
select {
case errc <- err:
case <-done:
case <-alarm.C:
errc <- errTimedOut
}
}
case <-done:
case <-alarm.C:
errc <- errTimedOut
}
}()
}
go func() {
errc <- mockNode.Expect(&exp)
wg.Wait()
// close errc when all goroutines finish to return nill err from errc
close(errc)
}()
t := exp.Timeout
if t == time.Duration(0) {
t = 2000 * time.Millisecond
}
select {
case err := <-errc:
return err
case <-time.After(t):
return fmt.Errorf("timout expecting %v sent to peer %v", exp.Msg, exp.Peer)
}
return <-errc
}
// TestExchanges tests a series of exchanges against the session
func (self *ProtocolSession) TestExchanges(exchanges ...Exchange) error {
// launch all triggers of this exchanges
for _, e := range exchanges {
errc := make(chan error, len(e.Triggers)+len(e.Expects))
for _, trig := range e.Triggers {
errc <- self.trigger(trig)
}
// each expectation is spawned in separate go-routine
// expectations of an exchange are conjunctive but unordered, i.e.,
// only all of them arriving constitutes a pass
// each expectation is meant to be for a different peer, otherwise they are expected to panic
// testing of an exchange blocks until all expectations are decided
// an expectation is decided if
// expected message arrives OR
// an unexpected message arrives (panic)
// times out on their individual timeout
for _, ex := range e.Expects {
// expect msg spawned to separate go routine
go func(exp Expect) {
errc <- self.expect(exp)
}(ex)
}
// time out globally or finish when all expectations satisfied
timeout := time.After(5 * time.Second)
for i := 0; i < len(e.Triggers)+len(e.Expects); i++ {
select {
case err := <-errc:
if err != nil {
return fmt.Errorf("exchange failed with: %v", err)
}
case <-timeout:
return fmt.Errorf("exchange %v: '%v' timed out", i, e.Label)
}
for i, e := range exchanges {
if err := self.testExchange(e); err != nil {
return fmt.Errorf("exchange #%d %q: %v", i, e.Label, err)
}
log.Trace(fmt.Sprintf("exchange #%d %q: run successfully", i, e.Label))
}
return nil
}
// testExchange tests a single Exchange.
// Default timeout value is 2 seconds.
func (self *ProtocolSession) testExchange(e Exchange) error {
errc := make(chan error)
done := make(chan struct{})
defer close(done)
go func() {
for _, trig := range e.Triggers {
err := self.trigger(trig)
if err != nil {
errc <- err
return
}
}
select {
case errc <- self.expect(e.Expects):
case <-done:
}
}()
// time out globally or finish when all expectations satisfied
t := e.Timeout
if t == 0 {
t = 2000 * time.Millisecond
}
alarm := time.NewTimer(t)
select {
case err := <-errc:
return err
case <-alarm.C:
return errTimedOut
}
}
// TestDisconnected tests the disconnections given as arguments
// the disconnect structs describe what disconnect error is expected on which peer
func (self *ProtocolSession) TestDisconnected(disconnects ...*Disconnect) error {

79
p2p/testing/protocoltester.go
View File

@ -24,7 +24,11 @@ that can be used to send and receive messages
package testing
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"strings"
"sync"
"testing"
@ -34,6 +38,7 @@ import (
"github.com/ethereum/go-ethereum/p2p/discover"
"github.com/ethereum/go-ethereum/p2p/simulations"
"github.com/ethereum/go-ethereum/p2p/simulations/adapters"
"github.com/ethereum/go-ethereum/rlp"
"github.com/ethereum/go-ethereum/rpc"
)
@ -152,7 +157,7 @@ type mockNode struct {
testNode
trigger chan *Trigger
expect chan *Expect
expect chan []Expect
err chan error
stop chan struct{}
stopOnce sync.Once
@ -161,7 +166,7 @@ type mockNode struct {
func newMockNode() *mockNode {
mock := &mockNode{
trigger: make(chan *Trigger),
expect: make(chan *Expect),
expect: make(chan []Expect),
err: make(chan error),
stop: make(chan struct{}),
}
@ -176,8 +181,8 @@ func (m *mockNode) Run(peer *p2p.Peer, rw p2p.MsgReadWriter) error {
select {
case trig := <-m.trigger:
m.err <- p2p.Send(rw, trig.Code, trig.Msg)
case exp := <-m.expect:
m.err <- p2p.ExpectMsg(rw, exp.Code, exp.Msg)
case exps := <-m.expect:
m.err <- expectMsgs(rw, exps)
case <-m.stop:
return nil
}
@ -189,7 +194,7 @@ func (m *mockNode) Trigger(trig *Trigger) error {
return <-m.err
}
func (m *mockNode) Expect(exp *Expect) error {
func (m *mockNode) Expect(exp ...Expect) error {
m.expect <- exp
return <-m.err
}
@ -198,3 +203,67 @@ func (m *mockNode) Stop() error {
m.stopOnce.Do(func() { close(m.stop) })
return nil
}
func expectMsgs(rw p2p.MsgReadWriter, exps []Expect) error {
matched := make([]bool, len(exps))
for {
msg, err := rw.ReadMsg()
if err != nil {
if err == io.EOF {
break
}
return err
}
actualContent, err := ioutil.ReadAll(msg.Payload)
if err != nil {
return err
}
var found bool
for i, exp := range exps {
if exp.Code == msg.Code && bytes.Equal(actualContent, mustEncodeMsg(exp.Msg)) {
if matched[i] {
return fmt.Errorf("message #%d received two times", i)
}
matched[i] = true
found = true
break
}
}
if !found {
expected := make([]string, 0)
for i, exp := range exps {
if matched[i] {
continue
}
expected = append(expected, fmt.Sprintf("code %d payload %x", exp.Code, mustEncodeMsg(exp.Msg)))
}
return fmt.Errorf("unexpected message code %d payload %x, expected %s", msg.Code, actualContent, strings.Join(expected, " or "))
}
done := true
for _, m := range matched {
if !m {
done = false
break
}
}
if done {
return nil
}
}
for i, m := range matched {
if !m {
return fmt.Errorf("expected message #%d not received", i)
}
}
return nil
}
// mustEncodeMsg uses rlp to encode a message.
// In case of error it panics.
func mustEncodeMsg(msg interface{}) []byte {
contentEnc, err := rlp.EncodeToBytes(msg)
if err != nil {
panic("content encode error: " + err.Error())
}
return contentEnc
}