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package raft
import (
"testing"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/mock"
)
// Ensure that a snapshot occurs when there are existing logs.
func TestSnapshot(t *testing.T) {
runServerWithMockStateMachine(Leader, func(s Server, m *mock.Mock) {
m.On("Save").Return([]byte("foo"), nil)
m.On("Recovery", []byte("foo")).Return(nil)
s.Do(&testCommand1{})
err := s.TakeSnapshot()
assert.NoError(t, err)
assert.Equal(t, s.(*server).snapshot.LastIndex, uint64(2))
// Repeat to make sure new snapshot gets created.
s.Do(&testCommand1{})
err = s.TakeSnapshot()
assert.NoError(t, err)
assert.Equal(t, s.(*server).snapshot.LastIndex, uint64(4))
// Restart server.
s.Stop()
s.Start()
// Recover from snapshot.
err = s.LoadSnapshot()
assert.NoError(t, err)
})
}
// Ensure that a snapshot request can be sent and received.
func TestSnapshotRequest(t *testing.T) {
runServerWithMockStateMachine(Follower, func(s Server, m *mock.Mock) {
m.On("Recovery", []byte("bar")).Return(nil)
// Send snapshot request.
resp := s.RequestSnapshot(&SnapshotRequest{LastIndex: 5, LastTerm: 1})
assert.Equal(t, resp.Success, true)
assert.Equal(t, s.State(), Snapshotting)
// Send recovery request.
resp2 := s.SnapshotRecoveryRequest(&SnapshotRecoveryRequest{
LeaderName: "1",
LastIndex: 5,
LastTerm: 2,
Peers: make([]*Peer, 0),
State: []byte("bar"),
})
assert.Equal(t, resp2.Success, true)
})
}
func runServerWithMockStateMachine(state string, fn func(s Server, m *mock.Mock)) {
var m mockStateMachine
s := newTestServer("1", &testTransporter{})
s.(*server).stateMachine = &m
if err := s.Start(); err != nil {
panic("server start error: " + err.Error())
}
if state == Leader {
if _, err := s.Do(&DefaultJoinCommand{Name: s.Name()}); err != nil {
panic("unable to join server to self: " + err.Error())
}
}
defer s.Stop()
fn(s, &m.Mock)
}