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pd.go
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pd.go
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// Copyright 2016 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 mocktikv
import (
"context"
"sync"
"time"
"github.com/pingcap/errors"
"github.com/pingcap/kvproto/pkg/metapb"
"github.com/pingcap/kvproto/pkg/pdpb"
"github.com/pingcap/pd/v4/client"
)
// Use global variables to prevent pdClients from creating duplicate timestamps.
var tsMu = struct {
sync.Mutex
physicalTS int64
logicalTS int64
}{}
type pdClient struct {
cluster *Cluster
// SafePoint set by `UpdateGCSafePoint`. Not to be confused with SafePointKV.
gcSafePoint uint64
gcSafePointMu sync.Mutex
}
// NewPDClient creates a mock pd.Client that uses local timestamp and meta data
// from a Cluster.
func NewPDClient(cluster *Cluster) pd.Client {
return &pdClient{
cluster: cluster,
}
}
func (c *pdClient) ConfigClient() pd.ConfigClient {
return nil
}
func (c *pdClient) GetClusterID(ctx context.Context) uint64 {
return 1
}
func (c *pdClient) GetTS(context.Context) (int64, int64, error) {
tsMu.Lock()
defer tsMu.Unlock()
ts := time.Now().UnixNano() / int64(time.Millisecond)
if tsMu.physicalTS >= ts {
tsMu.logicalTS++
} else {
tsMu.physicalTS = ts
tsMu.logicalTS = 0
}
return tsMu.physicalTS, tsMu.logicalTS, nil
}
func (c *pdClient) GetTSAsync(ctx context.Context) pd.TSFuture {
return &mockTSFuture{c, ctx, false}
}
type mockTSFuture struct {
pdc *pdClient
ctx context.Context
used bool
}
func (m *mockTSFuture) Wait() (int64, int64, error) {
if m.used {
return 0, 0, errors.New("cannot wait tso twice")
}
m.used = true
return m.pdc.GetTS(m.ctx)
}
func (c *pdClient) GetRegion(ctx context.Context, key []byte) (*metapb.Region, *metapb.Peer, error) {
region, peer := c.cluster.GetRegionByKey(key)
return region, peer, nil
}
func (c *pdClient) GetPrevRegion(ctx context.Context, key []byte) (*metapb.Region, *metapb.Peer, error) {
region, peer := c.cluster.GetPrevRegionByKey(key)
return region, peer, nil
}
func (c *pdClient) GetRegionByID(ctx context.Context, regionID uint64) (*metapb.Region, *metapb.Peer, error) {
region, peer := c.cluster.GetRegionByID(regionID)
return region, peer, nil
}
func (c *pdClient) ScanRegions(ctx context.Context, startKey []byte, endKey []byte, limit int) ([]*metapb.Region, []*metapb.Peer, error) {
regions, peers := c.cluster.ScanRegions(startKey, endKey, limit)
return regions, peers, nil
}
func (c *pdClient) GetStore(ctx context.Context, storeID uint64) (*metapb.Store, error) {
select {
case <-ctx.Done():
return nil, ctx.Err()
default:
}
store := c.cluster.GetStore(storeID)
return store, nil
}
func (c *pdClient) GetAllStores(ctx context.Context, opts ...pd.GetStoreOption) ([]*metapb.Store, error) {
return c.cluster.GetAllStores(), nil
}
func (c *pdClient) UpdateGCSafePoint(ctx context.Context, safePoint uint64) (uint64, error) {
c.gcSafePointMu.Lock()
defer c.gcSafePointMu.Unlock()
if safePoint > c.gcSafePoint {
c.gcSafePoint = safePoint
}
return c.gcSafePoint, nil
}
func (c *pdClient) Close() {
}
func (c *pdClient) ScatterRegion(ctx context.Context, regionID uint64) error {
return nil
}
func (c *pdClient) GetOperator(ctx context.Context, regionID uint64) (*pdpb.GetOperatorResponse, error) {
return &pdpb.GetOperatorResponse{Status: pdpb.OperatorStatus_SUCCESS}, nil
}
func (c *pdClient) GetLeaderAddr() string { return "mockpd" }