mirror of https://github.com/k3s-io/k3s
65 lines
1.9 KiB
Go
65 lines
1.9 KiB
Go
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// Copyright 2015 The etcd Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package snap
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import (
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"io"
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"go.etcd.io/etcd/pkg/ioutil"
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"go.etcd.io/etcd/raft/raftpb"
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)
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// Message is a struct that contains a raft Message and a ReadCloser. The type
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// of raft message MUST be MsgSnap, which contains the raft meta-data and an
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// additional data []byte field that contains the snapshot of the actual state
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// machine.
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// Message contains the ReadCloser field for handling large snapshot. This avoid
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// copying the entire snapshot into a byte array, which consumes a lot of memory.
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//
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// User of Message should close the Message after sending it.
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type Message struct {
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raftpb.Message
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ReadCloser io.ReadCloser
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TotalSize int64
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closeC chan bool
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}
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func NewMessage(rs raftpb.Message, rc io.ReadCloser, rcSize int64) *Message {
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return &Message{
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Message: rs,
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ReadCloser: ioutil.NewExactReadCloser(rc, rcSize),
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TotalSize: int64(rs.Size()) + rcSize,
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closeC: make(chan bool, 1),
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}
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}
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// CloseNotify returns a channel that receives a single value
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// when the message sent is finished. true indicates the sent
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// is successful.
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func (m Message) CloseNotify() <-chan bool {
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return m.closeC
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}
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func (m Message) CloseWithError(err error) {
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if cerr := m.ReadCloser.Close(); cerr != nil {
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err = cerr
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}
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if err == nil {
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m.closeC <- true
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} else {
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m.closeC <- false
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}
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}
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