// updates the member list with the slice of changes, applying selectively
func (m *memberlist) Update(changes []Change) (applied []Change) {
if m.node.Stopped() || len(changes) == 0 {
return nil
}
m.node.emit(MemberlistChangesReceivedEvent{changes})
m.members.Lock()
for _, change := range changes {
member, ok := m.members.byAddress[change.Address]
// first time member has been seen, take change wholesale
if !ok {
m.Apply(change)
applied = append(applied, change)
continue
}
// if change is local override, reassert member is alive
if member.localOverride(m.node.Address(), change) {
m.node.emit(RefuteUpdateEvent{})
overrideChange := Change{
Source: change.Source,
SourceIncarnation: change.SourceIncarnation,
Address: change.Address,
Incarnation: nowInMillis(m.node.clock),
Status: Alive,
Timestamp: util.Timestamp(time.Now()),
}
m.Apply(overrideChange)
applied = append(applied, overrideChange)
continue
}
// if non-local override, apply change wholesale
if member.nonLocalOverride(change) {
m.Apply(change)
applied = append(applied, change)
}
}
m.members.Unlock()
if len(applied) > 0 {
oldChecksum := m.Checksum()
m.ComputeChecksum()
m.node.emit(MemberlistChangesAppliedEvent{
Changes: applied,
OldChecksum: oldChecksum,
NewChecksum: m.Checksum(),
NumMembers: m.NumMembers(),
})
m.node.handleChanges(applied)
m.node.rollup.TrackUpdates(applied)
}
return applied
}
func (r *updateRollup) AddUpdates(changes []Change) {
r.buffer.Lock()
timestamp := time.Now()
for _, change := range changes {
change.Timestamp = util.Timestamp(timestamp)
r.buffer.updates[change.Address] = append(r.buffer.updates[change.Address], change)
}
r.buffer.Unlock()
}
// makes a change to the member list
func (m *memberlist) MakeChange(address string, incarnation int64, status string) []Change {
if m.local == nil {
m.local = &Member{
Address: m.node.Address(),
Incarnation: util.TimeNowMS(),
Status: Alive,
}
}
return m.Update([]Change{Change{
Source: m.local.Address,
SourceIncarnation: m.local.Incarnation,
Address: address,
Incarnation: incarnation,
Status: status,
Timestamp: util.Timestamp(time.Now()),
}})
}
"github.com/gl-works/ringpop-go/util"
"github.com/stretchr/testify/assert"
"github.com/stretchr/testify/require"
"github.com/uber/tchannel-go"
)
var testNow = time.Now()
var testInc = util.TimeNowMS()
var testSuspect = Change{
Address: "127.0.0.1:3002",
Incarnation: testInc,
Source: "127.0.0.1:3001",
SourceIncarnation: testInc,
Status: Suspect,
Timestamp: util.Timestamp(testNow),
}
type dummyIter struct{}
func (dummyIter) Next() (*Member, bool) {
return &Member{
Address: "127.0.0.1:3010",
Status: Alive,
Incarnation: testInc,
}, true
}
type testNode struct {
node *Node
channel *tchannel.Channel