tidb region 源码
tidb region 代码
文件路径：/domain/infosync/region.go
// Copyright 2021 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,
// 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 infosync
import (
"context"
"encoding/hex"
"encoding/json"
"fmt"
"github.com/pingcap/errors"
"github.com/pingcap/tidb/util/pdapi"
)
// PlacementScheduleState is the returned third-valued state from GetReplicationState(). For convenience, the string of PD is deserialized into an enum first.
type PlacementScheduleState int
const (
// PlacementScheduleStatePending corresponds to "PENDING" from PD.
PlacementScheduleStatePending PlacementScheduleState = iota
// PlacementScheduleStateInProgress corresponds to "INPROGRESS" from PD.
PlacementScheduleStateInProgress
// PlacementScheduleStateScheduled corresponds to "REPLICATED" from PD.
PlacementScheduleStateScheduled
)
func (t PlacementScheduleState) String() string {
switch t {
case PlacementScheduleStateScheduled:
return "SCHEDULED"
case PlacementScheduleStateInProgress:
return "INPROGRESS"
case PlacementScheduleStatePending:
return "PENDING"
default:
return "PENDING"
}
}
// GetReplicationState is used to check if regions in the given keyranges are replicated from PD.
func GetReplicationState(ctx context.Context, startKey []byte, endKey []byte) (PlacementScheduleState, error) {
is, err := getGlobalInfoSyncer()
if err != nil {
return PlacementScheduleStatePending, err
}
if is.etcdCli == nil {
return PlacementScheduleStatePending, nil
}
addrs := is.etcdCli.Endpoints()
if len(addrs) == 0 {
return PlacementScheduleStatePending, errors.Errorf("pd unavailable")
}
res, err := doRequest(ctx, "GetReplicationState", addrs, fmt.Sprintf("%s/replicated?startKey=%s&endKey=%s", pdapi.Regions, hex.EncodeToString(startKey), hex.EncodeToString(endKey)), "GET", nil)
if err == nil && res != nil {
st := PlacementScheduleStatePending
// it should not fail
var state string
_ = json.Unmarshal(res, &state)
switch state {
case "REPLICATED":
st = PlacementScheduleStateScheduled
case "INPROGRESS":
st = PlacementScheduleStateInProgress
case "PENDING":
st = PlacementScheduleStatePending
}
return st, nil
}
return PlacementScheduleStatePending, err
}
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