/
region_option.go
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/
region_option.go
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// Copyright 2018 PingCAP, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.
package core
import (
"github.com/pingcap/kvproto/pkg/metapb"
"github.com/pingcap/kvproto/pkg/pdpb"
)
// RegionOption is used to select region.
type RegionOption func(region *RegionInfo) bool
// HealthRegion checks if the region is healthy.
func HealthRegion() RegionOption {
return func(region *RegionInfo) bool {
return len(region.downPeers) == 0 && len(region.pendingPeers) == 0 && len(region.learners) == 0
}
}
// RegionCreateOption used to create region.
type RegionCreateOption func(region *RegionInfo)
// WithDownPeers sets the down peers for the region.
func WithDownPeers(downPeers []*pdpb.PeerStats) RegionCreateOption {
return func(region *RegionInfo) {
region.downPeers = downPeers
}
}
// WithPendingPeers sets the pending peers for the region.
func WithPendingPeers(pengdingPeers []*metapb.Peer) RegionCreateOption {
return func(region *RegionInfo) {
region.pendingPeers = pengdingPeers
}
}
// WithLearners sets the learners for the region.
func WithLearners(learners []*metapb.Peer) RegionCreateOption {
return func(region *RegionInfo) {
region.learners = learners
}
}
// WithLeader sets the leader for the region.
func WithLeader(leader *metapb.Peer) RegionCreateOption {
return func(region *RegionInfo) {
region.leader = leader
}
}
// WithStartKey sets the start key for the region.
func WithStartKey(key []byte) RegionCreateOption {
return func(region *RegionInfo) {
region.meta.StartKey = key
}
}
// WithEndKey sets the end key for the region.
func WithEndKey(key []byte) RegionCreateOption {
return func(region *RegionInfo) {
region.meta.EndKey = key
}
}
// WithNewRegionID sets new id for the region.
func WithNewRegionID(id uint64) RegionCreateOption {
return func(region *RegionInfo) {
region.meta.Id = id
}
}
// WithNewPeerIds sets new ids for peers.
func WithNewPeerIds(peerIds ...uint64) RegionCreateOption {
return func(region *RegionInfo) {
if len(peerIds) != len(region.meta.GetPeers()) {
return
}
for i, p := range region.meta.GetPeers() {
p.Id = peerIds[i]
}
}
}
// WithIncVersion increases the version of the region.
func WithIncVersion() RegionCreateOption {
return func(region *RegionInfo) {
e := region.meta.GetRegionEpoch()
if e != nil {
e.Version++
}
}
}
// WithDecVersion decreases the version of the region.
func WithDecVersion() RegionCreateOption {
return func(region *RegionInfo) {
e := region.meta.GetRegionEpoch()
if e != nil {
e.Version--
}
}
}
// WithIncConfVer increases the config version of the region.
func WithIncConfVer() RegionCreateOption {
return func(region *RegionInfo) {
e := region.meta.GetRegionEpoch()
if e != nil {
e.ConfVer++
}
}
}
// WithDecConfVer decreases the config version of the region.
func WithDecConfVer() RegionCreateOption {
return func(region *RegionInfo) {
e := region.meta.GetRegionEpoch()
if e != nil {
e.ConfVer--
}
}
}
// SetWrittenBytes sets the written bytes for the region.
func SetWrittenBytes(v uint64) RegionCreateOption {
return func(region *RegionInfo) {
region.writtenBytes = v
}
}
// WithRemoveStorePeer removes the specified peer for the region.
func WithRemoveStorePeer(storeID uint64) RegionCreateOption {
return func(region *RegionInfo) {
var peers []*metapb.Peer
for _, peer := range region.meta.GetPeers() {
if peer.GetStoreId() != storeID {
peers = append(peers, peer)
}
}
region.meta.Peers = peers
}
}
// SetReadBytes sets the read bytes for the region.
func SetReadBytes(v uint64) RegionCreateOption {
return func(region *RegionInfo) {
region.readBytes = v
}
}
// SetApproximateSize sets the approximate size for the region.
func SetApproximateSize(v int64) RegionCreateOption {
return func(region *RegionInfo) {
region.approximateSize = v
}
}
// SetApproximateKeys sets the approximate keys for the region.
func SetApproximateKeys(v int64) RegionCreateOption {
return func(region *RegionInfo) {
region.approximateKeys = v
}
}
// SetRegionConfVer sets the config version for the reigon.
func SetRegionConfVer(confVer uint64) RegionCreateOption {
return func(region *RegionInfo) {
if region.meta.RegionEpoch == nil {
region.meta.RegionEpoch = &metapb.RegionEpoch{ConfVer: confVer, Version: 1}
} else {
region.meta.RegionEpoch.ConfVer = confVer
}
}
}
// SetRegionVersion sets the version for the reigon.
func SetRegionVersion(version uint64) RegionCreateOption {
return func(region *RegionInfo) {
if region.meta.RegionEpoch == nil {
region.meta.RegionEpoch = &metapb.RegionEpoch{ConfVer: 1, Version: version}
} else {
region.meta.RegionEpoch.Version = version
}
}
}
// SetPeers sets the peers for the region.
func SetPeers(peers []*metapb.Peer) RegionCreateOption {
return func(region *RegionInfo) {
region.meta.Peers = peers
}
}
// WithAddPeer adds a peer for the region.
func WithAddPeer(peer *metapb.Peer) RegionCreateOption {
return func(region *RegionInfo) {
region.meta.Peers = append(region.meta.Peers, peer)
if peer.IsLearner {
region.learners = append(region.learners, peer)
} else {
region.voters = append(region.voters, peer)
}
}
}
// WithPromoteLearner promotes the learner.
func WithPromoteLearner(peerID uint64) RegionCreateOption {
return func(region *RegionInfo) {
for _, p := range region.GetPeers() {
if p.GetId() == peerID {
p.IsLearner = false
}
}
}
}