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// Copyright 2017 Canonical Ltd.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package raftmembership_test
import (
"testing"
"time"
"github.com/CanonicalLtd/raft-membership"
"github.com/CanonicalLtd/raft-test"
"github.com/hashicorp/raft"
)
func TestHandleChangeRequests_ErrUnknownLeader(t *testing.T) {
rafts, control := rafttest.Cluster(t, rafttest.FSMs(3))
defer control.Close()
request := raftmembership.NewJoinRequest("1", "1.2.3.4")
handleOneChangeRequest(rafts["0"], request)
err := request.Error(time.Second)
if err == nil {
t.Fatal("no error returned despite no leader was elected yet")
}
switch err := err.(type) {
case *raftmembership.ErrUnknownLeader:
default:
t.Fatalf("error is not of type ErrUnknownLeader: %v", err)
}
}
func TestHandleChangeRequests_ErrDifferentLeader(t *testing.T) {
rafts, control := rafttest.Cluster(t, rafttest.FSMs(2))
defer control.Close()
control.Elect("0")
raft1 := rafts["0"]
raft2 := rafts["1"]
request := raftmembership.NewLeaveRequest("1.2.3.4")
handleOneChangeRequest(raft2, request)
err := request.Error(time.Second)
if err == nil {
t.Fatal("no error returned despite request was made to non-leader")
}
switch err := err.(type) {
case *raftmembership.ErrDifferentLeader:
leader := raft1.Leader()
if err.Leader() != string(leader) {
t.Errorf("expected leader\n%q\ngot\n%q", leader, err.Leader())
}
break
default:
t.Fatalf("error is not of type ErrDifferentLeader: %v", err)
break
}
}
func TestHandleChangeRequests_KnownPeer(t *testing.T) {
raft, cleanup := rafttest.Server(t, rafttest.FSM())
defer cleanup()
request := raftmembership.NewJoinRequest("0", "1.2.3.4")
handleOneChangeRequest(raft, request)
// The request is effectively a no-op and returns no error.
if err := request.Error(time.Second); err != nil {
t.Error(err)
}
}
func TestHandleChangeRequests_LeaveRequest(t *testing.T) {
fsms := rafttest.FSMs(3)
rafts, control := rafttest.Cluster(t, fsms)
defer control.Close()
control.Elect("0")
r := rafts["0"]
id := raft.ServerID("2")
request := raftmembership.NewLeaveRequest(id)
handleOneChangeRequest(r, request)
// The request succeeds.
if err := request.Error(time.Second); err != nil {
t.Error(err)
}
}
// Wrapper around HandleChangeRequests that synchronously handles a
// single ChangeRequest.
func handleOneChangeRequest(raft *raft.Raft, request *raftmembership.ChangeRequest) {
requests := make(chan *raftmembership.ChangeRequest, 1)
requests <- request
close(requests)
raftmembership.HandleChangeRequests(raft, requests)
}
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