Golang roachpb.Value類代碼示例

// StoreData writes the supplied time series data to the cockroach server.
// Stored data will be sampled at the supplied resolution.
func (db *DB) StoreData(ctx context.Context, r Resolution, data []tspb.TimeSeriesData) error {
	var kvs []roachpb.KeyValue

	// Process data collection: data is converted to internal format, and a key
	// is generated for each internal message.
	for _, d := range data {
		idatas, err := d.ToInternal(r.SlabDuration(), r.SampleDuration())
		if err != nil {
			return err
		}
		for _, idata := range idatas {
			var value roachpb.Value
			if err := value.SetProto(&idata); err != nil {
				return err
			}
			kvs = append(kvs, roachpb.KeyValue{
				Key:   MakeDataKey(d.Name, d.Source, r, idata.StartTimestampNanos),
				Value: value,
			})
		}
	}

	// Send the individual internal merge requests.
	b := &client.Batch{}
	for _, kv := range kvs {
		b.AddRawRequest(&roachpb.MergeRequest{
			Span: roachpb.Span{
				Key: kv.Key,
			},
			Value: kv.Value,
		})
	}

	return db.db.Run(ctx, b)
}

func setAppliedIndex(
	ctx context.Context,
	eng engine.ReadWriter,
	ms *enginepb.MVCCStats,
	rangeID roachpb.RangeID,
	appliedIndex,
	leaseAppliedIndex uint64,
) error {
	var value roachpb.Value
	value.SetInt(int64(appliedIndex))

	if err := engine.MVCCPut(ctx, eng, ms,
		keys.RaftAppliedIndexKey(rangeID),
		hlc.ZeroTimestamp,
		value,
		nil /* txn */); err != nil {
		return err
	}
	value.SetInt(int64(leaseAppliedIndex))
	return engine.MVCCPut(ctx, eng, ms,
		keys.LeaseAppliedIndexKey(rangeID),
		hlc.ZeroTimestamp,
		value,
		nil /* txn */)
}

// insertCPutFn is used by insertRow when conflicts should be respected.
// logValue is used for pretty printing.
func insertCPutFn(ctx context.Context, b puter, key *roachpb.Key, value *roachpb.Value) {
	// TODO(dan): We want do this V(2) log everywhere in sql. Consider making a
	// client.Batch wrapper instead of inlining it everywhere.
	if log.V(2) {
		log.InfofDepth(ctx, 1, "CPut %s -> %s", *key, value.PrettyPrint())
	}
	b.CPut(key, value, nil)
}

func maybeUnmarshalInline(v []byte, dest proto.Message) error {
	var meta enginepb.MVCCMetadata
	if err := meta.Unmarshal(v); err != nil {
		return err
	}
	value := roachpb.Value{
		RawBytes: meta.RawBytes,
	}
	return value.GetProto(dest)
}

func setLastIndex(
	ctx context.Context, eng engine.ReadWriter, rangeID roachpb.RangeID, lastIndex uint64,
) error {
	var value roachpb.Value
	value.SetInt(int64(lastIndex))

	return engine.MVCCPut(ctx, eng, nil, keys.RaftLastIndexKey(rangeID),
		hlc.ZeroTimestamp,
		value,
		nil /* txn */)
}

func newInfo(val float64) Info {
	now := timeutil.Now()

	v := roachpb.Value{Timestamp: hlc.Timestamp{WallTime: now.UnixNano()}}
	v.SetFloat(val)

	return Info{
		Value:     v,
		OrigStamp: now.UnixNano(),
		TTLStamp:  now.Add(time.Millisecond).UnixNano(),
	}
}

// Create the key/value pairs for the default zone config entry.
func createDefaultZoneConfig() []roachpb.KeyValue {
	var ret []roachpb.KeyValue
	value := roachpb.Value{}
	desc := config.DefaultZoneConfig()
	if err := value.SetProto(&desc); err != nil {
		log.Fatalf(context.TODO(), "could not marshal %v", desc)
	}
	ret = append(ret, roachpb.KeyValue{
		Key:   MakeZoneKey(keys.RootNamespaceID),
		Value: value,
	})
	return ret
}

func tryMeta(kv engine.MVCCKeyValue) (string, error) {
	if !bytes.HasPrefix(kv.Key.Key, keys.Meta1Prefix) && !bytes.HasPrefix(kv.Key.Key, keys.Meta2Prefix) {
		return "", errors.New("not a meta key")
	}
	value := roachpb.Value{
		Timestamp: kv.Key.Timestamp,
		RawBytes:  kv.Value,
	}
	var desc roachpb.RangeDescriptor
	if err := value.GetProto(&desc); err != nil {
		return "", err
	}
	return descStr(desc), nil
}

// BenchmarkMVCCMergeTimeSeries computes performance of merging time series data.
// Uses an in-memory engine.
func BenchmarkMVCCMergeTimeSeries_RocksDB(b *testing.B) {
	ts := &roachpb.InternalTimeSeriesData{
		StartTimestampNanos: 0,
		SampleDurationNanos: 1000,
		Samples: []roachpb.InternalTimeSeriesSample{
			{Offset: 0, Count: 1, Sum: 5.0},
		},
	}
	var value roachpb.Value
	if err := value.SetProto(ts); err != nil {
		b.Fatal(err)
	}
	runMVCCMerge(setupMVCCInMemRocksDB, &value, 1024, b)
}

func setFrozenStatus(
	ctx context.Context,
	eng engine.ReadWriter,
	ms *enginepb.MVCCStats,
	rangeID roachpb.RangeID,
	frozen storagebase.ReplicaState_FrozenEnum,
) error {
	if frozen == storagebase.ReplicaState_FROZEN_UNSPECIFIED {
		return errors.New("cannot persist unspecified FrozenStatus")
	}
	var val roachpb.Value
	val.SetBool(frozen == storagebase.ReplicaState_FROZEN)
	return engine.MVCCPut(ctx, eng, ms,
		keys.RangeFrozenStatusKey(rangeID), hlc.ZeroTimestamp, val, nil)
}

// storeGossipUpdate is the gossip callback used to keep the StorePool up to date.
func (sp *StorePool) storeGossipUpdate(_ string, content roachpb.Value) {
	var storeDesc roachpb.StoreDescriptor
	if err := content.GetProto(&storeDesc); err != nil {
		ctx := sp.AnnotateCtx(context.TODO())
		log.Error(ctx, err)
		return
	}

	sp.mu.Lock()
	defer sp.mu.Unlock()
	// Does this storeDetail exist yet?
	detail := sp.getStoreDetailLocked(storeDesc.StoreID)
	detail.markAlive(sp.clock.Now(), &storeDesc)
	sp.mu.queue.enqueue(detail)
}

// storeGossipUpdate is the gossip callback used to keep the StorePool up to date.
func (sp *StorePool) storeGossipUpdate(_ string, content roachpb.Value) {
	var storeDesc roachpb.StoreDescriptor
	if err := content.GetProto(&storeDesc); err != nil {
		ctx := sp.AnnotateCtx(context.TODO())
		log.Error(ctx, err)
		return
	}

	sp.mu.Lock()
	defer sp.mu.Unlock()
	detail := sp.getStoreDetailLocked(storeDesc.StoreID)
	detail.desc = &storeDesc
	detail.lastUpdatedTime = sp.clock.PhysicalTime()
	sp.mu.nodeLocalities[storeDesc.Node.NodeID] = storeDesc.Node.Locality
}

// append the given entries to the raft log. Takes the previous values of
// r.mu.lastIndex and r.mu.raftLogSize, and returns new values. We do this
// rather than modifying them directly because these modifications need to be
// atomic with the commit of the batch.
func (r *Replica) append(
	ctx context.Context,
	batch engine.ReadWriter,
	prevLastIndex uint64,
	prevRaftLogSize int64,
	entries []raftpb.Entry,
) (uint64, int64, error) {
	if len(entries) == 0 {
		return prevLastIndex, prevRaftLogSize, nil
	}
	var diff enginepb.MVCCStats
	var value roachpb.Value
	for i := range entries {
		ent := &entries[i]
		key := keys.RaftLogKey(r.RangeID, ent.Index)
		if err := value.SetProto(ent); err != nil {
			return 0, 0, err
		}
		value.InitChecksum(key)
		var err error
		if ent.Index > prevLastIndex {
			err = engine.MVCCBlindPut(ctx, batch, &diff, key, hlc.ZeroTimestamp, value, nil /* txn */)
		} else {
			err = engine.MVCCPut(ctx, batch, &diff, key, hlc.ZeroTimestamp, value, nil /* txn */)
		}
		if err != nil {
			return 0, 0, err
		}
	}

	// Delete any previously appended log entries which never committed.
	lastIndex := entries[len(entries)-1].Index
	for i := lastIndex + 1; i <= prevLastIndex; i++ {
		err := engine.MVCCDelete(ctx, batch, &diff, keys.RaftLogKey(r.RangeID, i),
			hlc.ZeroTimestamp, nil /* txn */)
		if err != nil {
			return 0, 0, err
		}
	}

	if err := setLastIndex(ctx, batch, r.RangeID, lastIndex); err != nil {
		return 0, 0, err
	}

	raftLogSize := prevRaftLogSize + diff.SysBytes

	return lastIndex, raftLogSize, nil
}

// deadReplicasGossipUpdate is the gossip callback used to keep the StorePool up to date.
func (sp *StorePool) deadReplicasGossipUpdate(_ string, content roachpb.Value) {
	var replicas roachpb.StoreDeadReplicas
	if err := content.GetProto(&replicas); err != nil {
		ctx := sp.AnnotateCtx(context.TODO())
		log.Error(ctx, err)
		return
	}

	sp.mu.Lock()
	defer sp.mu.Unlock()
	detail := sp.getStoreDetailLocked(replicas.StoreID)
	deadReplicas := make(map[roachpb.RangeID][]roachpb.ReplicaDescriptor)
	for _, r := range replicas.Replicas {
		deadReplicas[r.RangeID] = append(deadReplicas[r.RangeID], r.Replica)
	}
	detail.deadReplicas = deadReplicas
}

// Benchmark batch time series merge operations. This benchmark does not
// perform any reads and is only used to measure the cost of the periodic time
// series updates.
func runMVCCBatchTimeSeries(emk engineMaker, batchSize int, b *testing.B) {
	// Precompute keys so we don't waste time formatting them at each iteration.
	numKeys := batchSize
	keys := make([]roachpb.Key, numKeys)
	for i := 0; i < numKeys; i++ {
		keys[i] = roachpb.Key(fmt.Sprintf("key-%d", i))
	}

	// We always write the same time series data (containing a single unchanging
	// sample). This isn't realistic but is fine because we're never reading the
	// data.
	var value roachpb.Value
	if err := value.SetProto(&roachpb.InternalTimeSeriesData{
		StartTimestampNanos: 0,
		SampleDurationNanos: 1000,
		Samples: []roachpb.InternalTimeSeriesSample{
			{Offset: 0, Count: 1, Sum: 5.0},
		},
	}); err != nil {
		b.Fatal(err)
	}

	eng := emk(b, fmt.Sprintf("batch_merge_%d", batchSize))
	defer eng.Close()

	b.ResetTimer()

	ts := hlc.Timestamp{}
	for i := 0; i < b.N; i++ {
		batch := eng.NewBatch()

		for j := 0; j < batchSize; j++ {
			ts.Logical++
			if err := MVCCMerge(context.Background(), batch, nil, keys[j], ts, value); err != nil {
				b.Fatalf("failed put: %s", err)
			}
		}

		if err := batch.Commit(); err != nil {
			b.Fatal(err)
		}
		batch.Close()
	}

	b.StopTimer()
}