Golang Value.GetProto方法代碼示例

func printRaftLogEntry(kv engine.MVCCKeyValue) (bool, error) {
	var meta engine.MVCCMetadata
	if err := meta.Unmarshal(kv.Value); err != nil {
		return false, err
	}
	value := roachpb.Value{
		RawBytes: meta.RawBytes,
	}
	var ent raftpb.Entry
	if err := value.GetProto(&ent); err != nil {
		return false, err
	}
	if len(ent.Data) > 0 {
		_, cmdData := storage.DecodeRaftCommand(ent.Data)
		var cmd roachpb.RaftCommand
		if err := cmd.Unmarshal(cmdData); err != nil {
			return false, err
		}
		ent.Data = nil
		fmt.Printf("%s\n", &ent)
		fmt.Printf("%s\n", &cmd)
	} else {
		fmt.Printf("%s: EMPTY\n", &ent)
	}
	return false, 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)
}

// 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 {
		log.Error(context.TODO(), 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)
}

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
}

// 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 {
		log.Error(context.TODO(), 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
}

// updateNodeAddress is a gossip callback which fires with each
// update to the node address. This allows us to compute the
// total size of the gossip network (for determining max peers
// each gossip node is allowed to have), as well as to create
// new resolvers for each encountered host and to write the
// set of gossip node addresses to persistent storage when it
// changes.
func (g *Gossip) updateNodeAddress(_ string, content roachpb.Value) {
	var desc roachpb.NodeDescriptor
	if err := content.GetProto(&desc); err != nil {
		log.Error(err)
		return
	}

	g.mu.Lock()
	defer g.mu.Unlock()

	// Recompute max peers based on size of network and set the max
	// sizes for incoming and outgoing node sets.
	defer func() {
		maxPeers := g.maxPeers(len(g.nodeDescs))
		g.incoming.setMaxSize(maxPeers)
		g.outgoing.setMaxSize(maxPeers)
	}()

	// Skip if the node has already been seen or it's our own address.
	if _, ok := g.nodeDescs[desc.NodeID]; ok || desc.Address == g.is.NodeAddr {
		return
	}
	g.nodeDescs[desc.NodeID] = &desc

	// Add this new node to our list of resolvers so we can keep
	// connecting to gossip if the original resolvers go offline.
	r, err := resolver.NewResolverFromUnresolvedAddr(desc.Address)
	if err != nil {
		log.Warningf("bad address from gossip node %s: %s", desc, err)
		return
	}
	if !g.haveResolver(r) {
		g.resolvers = append(g.resolvers, r)
	}
	// Add new address to bootstrap info and persist if possible.
	if !g.haveBootstrapAddress(desc.Address) {
		g.bootstrapInfo.Addresses = append(g.bootstrapInfo.Addresses, desc.Address)
		if g.storage != nil {
			// TODO(spencer): need to clean up ancient gossip nodes, which
			//   will otherwise stick around in the bootstrap info forever.
			if err := g.storage.WriteBootstrapInfo(&g.bootstrapInfo); err != nil {
				log.Error(err)
			}
		}
	}
}

func tryRangeDescriptor(kv engine.MVCCKeyValue) (string, error) {
	_, suffix, _, err := keys.DecodeRangeKey(kv.Key.Key)
	if err != nil {
		return "", err
	}
	if !bytes.Equal(suffix, keys.LocalRangeDescriptorSuffix) {
		return "", fmt.Errorf("wrong suffix: %s", suffix)
	}
	value := roachpb.Value{
		RawBytes: kv.Value,
	}
	var desc roachpb.RangeDescriptor
	if err := value.GetProto(&desc); err != nil {
		return "", err
	}
	return descStr(desc), nil
}

// updateSystemConfig is the raw gossip info callback.
// Unmarshal the system config, and if successfuly, update out
// copy and run the callbacks.
func (g *Gossip) updateSystemConfig(key string, content roachpb.Value) {
	if key != KeySystemConfig {
		log.Fatalf("wrong key received on SystemConfig callback: %s", key)
		return
	}
	cfg := &config.SystemConfig{}
	if err := content.GetProto(cfg); err != nil {
		log.Errorf("could not unmarshal system config on callback: %s", err)
		return
	}

	g.systemConfigMu.Lock()
	defer g.systemConfigMu.Unlock()
	g.systemConfig = cfg
	for _, cb := range g.systemConfigCallbacks {
		go cb(cfg)
	}
}

func printRangeDescriptor(kv engine.MVCCKeyValue) (bool, error) {
	startKey, suffix, _, err := keys.DecodeRangeKey(kv.Key.Key)
	if err != nil {
		return false, err
	}
	if !bytes.Equal(suffix, keys.LocalRangeDescriptorSuffix) {
		return false, nil
	}
	value := roachpb.Value{
		RawBytes: kv.Value,
	}
	var desc roachpb.RangeDescriptor
	if err := value.GetProto(&desc); err != nil {
		return false, err
	}
	fmt.Printf("Range descriptor with start key %s at time %s\n%s\n", startKey, kv.Key.Timestamp.GoTime(), &desc)
	return false, 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 {
		log.Error(err)
		return
	}

	sp.mu.Lock()
	defer sp.mu.Unlock()
	// Does this storeDetail exist yet?
	detail, ok := sp.stores[storeDesc.StoreID]
	if !ok {
		// Setting index to -1 ensures this gets added to the queue.
		detail = &storeDetail{index: -1}
		sp.stores[storeDesc.StoreID] = detail
	}
	detail.markAlive(sp.clock.Now(), storeDesc, true)
	sp.queue.enqueue(detail)
}

// updateNodeAddress is a gossip callback which fires with each
// update to the node address. This allows us to compute the
// total size of the gossip network (for determining max peers
// each gossip node is allowed to have), as well as to create
// new resolvers for each encountered host and to write the
// set of gossip node addresses to persistent storage when it
// changes.
func (g *Gossip) updateNodeAddress(_ string, content roachpb.Value) {
	var desc roachpb.NodeDescriptor
	if err := content.GetProto(&desc); err != nil {
		log.Error(err)
		return
	}

	g.mu.Lock()
	defer g.mu.Unlock()

	// Skip if the node has already been seen.
	if _, ok := g.nodeDescs[desc.NodeID]; ok {
		return
	}

	g.nodeDescs[desc.NodeID] = &desc

	// Recompute max peers based on size of network and set the max
	// sizes for incoming and outgoing node sets.
	maxPeers := g.maxPeers(len(g.nodeDescs))
	g.incoming.setMaxSize(maxPeers)
	g.outgoing.setMaxSize(maxPeers)

	// Skip if it's our own address.
	if desc.Address == g.is.NodeAddr {
		return
	}

	// Add this new node address (if it's not already there) to our list
	// of resolvers so we can keep connecting to gossip if the original
	// resolvers go offline.
	g.maybeAddResolver(desc.Address)

	// Add new address (if it's not already there) to bootstrap info and
	// persist if possible.
	if g.maybeAddBootstrapAddress(desc.Address) && g.storage != nil {
		// TODO(spencer): need to clean up ancient gossip nodes, which
		//   will otherwise stick around in the bootstrap info forever.
		if err := g.storage.WriteBootstrapInfo(&g.bootstrapInfo); err != nil {
			log.Error(err)
		}
	}
}

// updateSystemConfig is the raw gossip info callback.
// Unmarshal the system config, and if successfully, update out
// copy and run the callbacks.
func (g *Gossip) updateSystemConfig(key string, content roachpb.Value) {
	if key != KeySystemConfig {
		log.Fatalf("wrong key received on SystemConfig callback: %s", key)
		return
	}
	cfg := config.SystemConfig{}
	if err := content.GetProto(&cfg); err != nil {
		log.Errorf("could not unmarshal system config on callback: %s", err)
		return
	}

	g.systemConfigMu.Lock()
	defer g.systemConfigMu.Unlock()
	g.systemConfig = cfg
	g.systemConfigSet = true
	for _, c := range g.systemConfigChannels {
		select {
		case c <- struct{}{}:
		default:
		}
	}
}

func TestSystemDBGossip(t *testing.T) {
	defer leaktest.AfterTest(t)
	s := StartTestServer(t)
	defer s.Stop()

	resultChan := make(chan roachpb.Value)
	var count int32
	db := s.db
	key := sql.MakeDescMetadataKey(keys.MaxReservedDescID)
	valAt := func(i int) *sql.DatabaseDescriptor {
		return &sql.DatabaseDescriptor{Name: "foo", ID: sql.ID(i)}
	}

	// Register a callback for gossip updates.
	s.Gossip().RegisterCallback(gossip.KeySystemConfig, func(_ string, content roachpb.Value) {
		newCount := atomic.AddInt32(&count, 1)
		if newCount != 2 {
			// RegisterCallback calls us right away with the contents,
			// so ignore the very first call.
			// We also only want the first value of all our writes.
			return
		}
		resultChan <- content
	})

	// The span only gets gossiped when it first shows up, or when
	// the EndTransaction trigger is set.

	// Try a plain KV write first.
	if err := db.Put(key, valAt(0)); err != nil {
		t.Fatal(err)
	}

	// Now do it as part of a transaction, but without the trigger set.
	if err := db.Txn(func(txn *client.Txn) error {
		return txn.Put(key, valAt(1))
	}); err != nil {
		t.Fatal(err)
	}

	// This time mark the transaction as having a SystemDB trigger.
	if err := db.Txn(func(txn *client.Txn) error {
		txn.SetSystemDBTrigger()
		return txn.Put(key, valAt(2))
	}); err != nil {
		t.Fatal(err)
	}

	// Wait for the callback.
	var systemConfig config.SystemConfig
	select {
	case content := <-resultChan:
		if err := content.GetProto(&systemConfig); err != nil {
			t.Fatal(err)
		}
	case <-time.After(500 * time.Millisecond):
		t.Fatal("did not receive gossip callback")
	}

	// Now check the gossip callback.
	var val *roachpb.Value
	for _, kv := range systemConfig.Values {
		if bytes.Equal(key, kv.Key) {
			val = &kv.Value
			break
		}
	}
	if val == nil {
		t.Fatal("key not found in gossiped info")
	}

	// Make sure the returned value is valAt(2).
	var got sql.DatabaseDescriptor
	if err := val.GetProto(&got); err != nil {
		t.Fatal(err)
	}
	if got.ID != 2 {
		t.Fatalf("mismatch: expected %+v, got %+v", valAt(2), got)
	}
}

func tryRangeIDKey(kv engine.MVCCKeyValue) (string, error) {
	if kv.Key.Timestamp != hlc.ZeroTimestamp {
		return "", fmt.Errorf("range ID keys shouldn't have timestamps: %s", kv.Key)
	}
	_, _, suffix, _, err := keys.DecodeRangeIDKey(kv.Key.Key)
	if err != nil {
		return "", err
	}

	// All range ID keys are stored inline on the metadata.
	var meta enginepb.MVCCMetadata
	if err := meta.Unmarshal(kv.Value); err != nil {
		return "", err
	}
	value := roachpb.Value{RawBytes: meta.RawBytes}

	// Values encoded as protobufs set msg and continue outside the
	// switch. Other types are handled inside the switch and return.
	var msg proto.Message
	switch {
	case bytes.Equal(suffix, keys.LocalLeaseAppliedIndexSuffix):
		fallthrough
	case bytes.Equal(suffix, keys.LocalRaftAppliedIndexSuffix):
		i, err := value.GetInt()
		if err != nil {
			return "", err
		}
		return strconv.FormatInt(i, 10), nil

	case bytes.Equal(suffix, keys.LocalRangeFrozenStatusSuffix):
		b, err := value.GetBool()
		if err != nil {
			return "", err
		}
		return strconv.FormatBool(b), nil

	case bytes.Equal(suffix, keys.LocalAbortCacheSuffix):
		msg = &roachpb.AbortCacheEntry{}

	case bytes.Equal(suffix, keys.LocalRangeLastGCSuffix):
		msg = &hlc.Timestamp{}

	case bytes.Equal(suffix, keys.LocalRaftTombstoneSuffix):
		msg = &roachpb.RaftTombstone{}

	case bytes.Equal(suffix, keys.LocalRaftTruncatedStateSuffix):
		msg = &roachpb.RaftTruncatedState{}

	case bytes.Equal(suffix, keys.LocalRangeLeaseSuffix):
		msg = &roachpb.Lease{}

	case bytes.Equal(suffix, keys.LocalRangeStatsSuffix):
		msg = &enginepb.MVCCStats{}

	case bytes.Equal(suffix, keys.LocalRaftHardStateSuffix):
		msg = &raftpb.HardState{}

	case bytes.Equal(suffix, keys.LocalRaftLastIndexSuffix):
		i, err := value.GetInt()
		if err != nil {
			return "", err
		}
		return strconv.FormatInt(i, 10), nil

	case bytes.Equal(suffix, keys.LocalRangeLastVerificationTimestampSuffix):
		msg = &hlc.Timestamp{}

	case bytes.Equal(suffix, keys.LocalRangeLastReplicaGCTimestampSuffix):
		msg = &hlc.Timestamp{}

	default:
		return "", fmt.Errorf("unknown raft id key %s", suffix)
	}

	if err := value.GetProto(msg); err != nil {
		return "", err
	}
	return msg.String(), nil
}

func TestSystemConfigGossip(t *testing.T) {
	defer leaktest.AfterTest(t)()
	s := StartTestServer(t)
	defer s.Stop()

	db := s.db
	key := sql.MakeDescMetadataKey(keys.MaxReservedDescID)
	valAt := func(i int) *sql.DatabaseDescriptor {
		return &sql.DatabaseDescriptor{Name: "foo", ID: sql.ID(i)}
	}

	// Register a callback for gossip updates.
	resultChan := s.Gossip().RegisterSystemConfigChannel()

	// The span gets gossiped when it first shows up.
	select {
	case <-resultChan:

	case <-time.After(500 * time.Millisecond):
		t.Fatal("did not receive gossip message")
	}

	// Try a plain KV write first.
	if err := db.Put(key, valAt(0)); err != nil {
		t.Fatal(err)
	}

	// Now do it as part of a transaction, but without the trigger set.
	if pErr := db.Txn(func(txn *client.Txn) *roachpb.Error {
		return txn.Put(key, valAt(1))
	}); pErr != nil {
		t.Fatal(pErr)
	}

	// Gossip channel should be dormant.
	var systemConfig config.SystemConfig
	select {
	case <-resultChan:
		systemConfig = *s.gossip.GetSystemConfig()
		t.Fatalf("unexpected message received on gossip channel: %v", systemConfig)

	case <-time.After(50 * time.Millisecond):
	}

	// This time mark the transaction as having a Gossip trigger.
	if pErr := db.Txn(func(txn *client.Txn) *roachpb.Error {
		txn.SetSystemConfigTrigger()
		return txn.Put(key, valAt(2))
	}); pErr != nil {
		t.Fatal(pErr)
	}

	// New system config received.
	select {
	case <-resultChan:
		systemConfig = *s.gossip.GetSystemConfig()

	case <-time.After(500 * time.Millisecond):
		t.Fatal("did not receive gossip message")
	}

	// Now check the new config.
	var val *roachpb.Value
	for _, kv := range systemConfig.Values {
		if bytes.Equal(key, kv.Key) {
			val = &kv.Value
			break
		}
	}
	if val == nil {
		t.Fatal("key not found in gossiped info")
	}

	// Make sure the returned value is valAt(2).
	got := new(sql.DatabaseDescriptor)
	if err := val.GetProto(got); err != nil {
		t.Fatal(err)
	}
	if expected := valAt(2); !reflect.DeepEqual(got, expected) {
		t.Fatalf("mismatch: expected %+v, got %+v", *expected, *got)
	}
}