mirror of https://github.com/k3s-io/k3s
81 lines
2.9 KiB
Go
81 lines
2.9 KiB
Go
// Copyright 2015 The etcd Authors
|
|
//
|
|
// 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 raft
|
|
|
|
import (
|
|
"errors"
|
|
|
|
pb "go.etcd.io/etcd/raft/raftpb"
|
|
)
|
|
|
|
// Bootstrap initializes the RawNode for first use by appending configuration
|
|
// changes for the supplied peers. This method returns an error if the Storage
|
|
// is nonempty.
|
|
//
|
|
// It is recommended that instead of calling this method, applications bootstrap
|
|
// their state manually by setting up a Storage that has a first index > 1 and
|
|
// which stores the desired ConfState as its InitialState.
|
|
func (rn *RawNode) Bootstrap(peers []Peer) error {
|
|
if len(peers) == 0 {
|
|
return errors.New("must provide at least one peer to Bootstrap")
|
|
}
|
|
lastIndex, err := rn.raft.raftLog.storage.LastIndex()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if lastIndex != 0 {
|
|
return errors.New("can't bootstrap a nonempty Storage")
|
|
}
|
|
|
|
// We've faked out initial entries above, but nothing has been
|
|
// persisted. Start with an empty HardState (thus the first Ready will
|
|
// emit a HardState update for the app to persist).
|
|
rn.prevHardSt = emptyState
|
|
|
|
// TODO(tbg): remove StartNode and give the application the right tools to
|
|
// bootstrap the initial membership in a cleaner way.
|
|
rn.raft.becomeFollower(1, None)
|
|
ents := make([]pb.Entry, len(peers))
|
|
for i, peer := range peers {
|
|
cc := pb.ConfChange{Type: pb.ConfChangeAddNode, NodeID: peer.ID, Context: peer.Context}
|
|
data, err := cc.Marshal()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
ents[i] = pb.Entry{Type: pb.EntryConfChange, Term: 1, Index: uint64(i + 1), Data: data}
|
|
}
|
|
rn.raft.raftLog.append(ents...)
|
|
|
|
// Now apply them, mainly so that the application can call Campaign
|
|
// immediately after StartNode in tests. Note that these nodes will
|
|
// be added to raft twice: here and when the application's Ready
|
|
// loop calls ApplyConfChange. The calls to addNode must come after
|
|
// all calls to raftLog.append so progress.next is set after these
|
|
// bootstrapping entries (it is an error if we try to append these
|
|
// entries since they have already been committed).
|
|
// We do not set raftLog.applied so the application will be able
|
|
// to observe all conf changes via Ready.CommittedEntries.
|
|
//
|
|
// TODO(bdarnell): These entries are still unstable; do we need to preserve
|
|
// the invariant that committed < unstable?
|
|
rn.raft.raftLog.committed = uint64(len(ents))
|
|
for _, peer := range peers {
|
|
rn.raft.applyConfChange(pb.ConfChange{NodeID: peer.ID, Type: pb.ConfChangeAddNode}.AsV2())
|
|
}
|
|
return nil
|
|
}
|