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lightwalletd
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add GetTreeState gRPC (for checkpoints)

This commit is contained in:
Larry Ruane 2020-10-28 12:37:52 -06:00 committed by Larry Ruane
parent 20105167b8
commit c66521335f
6 changed files with 417 additions and 114 deletions
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2
cmd/root.go
View File

@ -230,7 +230,7 @@ func startServer(opts *common.Options) error {
// Compact transaction service initialization
{
service, err := frontend.NewLwdStreamer(cache)
service, err := frontend.NewLwdStreamer(cache, chainName)
if err != nil {
common.Log.WithFields(logrus.Fields{
"error": err,

122
docs/rtd/index.html
View File

@ -300,6 +300,10 @@
<a href="#cash.z.wallet.sdk.rpc.TransparentAddressBlockFilter"><span class="badge">M</span>TransparentAddressBlockFilter</a>
</li>
<li>
<a href="#cash.z.wallet.sdk.rpc.TreeState"><span class="badge">M</span>TreeState</a>
</li>
<li>
<a href="#cash.z.wallet.sdk.rpc.TxFilter"><span class="badge">M</span>TxFilter</a>
</li>
@ -1045,34 +1049,6 @@ into a specified block on the next ApplyStaged().</p></td>
<td><p> </p></td>
</tr>
<tr>
<td>gitCommit</td>
<td><a href="#string">string</a></td>
<td></td>
<td><p> </p></td>
</tr>
<tr>
<td>branch</td>
<td><a href="#string">string</a></td>
<td></td>
<td><p> </p></td>
</tr>
<tr>
<td>buildDate</td>
<td><a href="#string">string</a></td>
<td></td>
<td><p> </p></td>
</tr>
<tr>
<td>buildUser</td>
<td><a href="#string">string</a></td>
<td></td>
<td><p> </p></td>
</tr>
<tr>
<td>vendor</td>
<td><a href="#string">string</a></td>
@ -1115,6 +1091,34 @@ into a specified block on the next ApplyStaged().</p></td>
<td><p>latest block on the best chain </p></td>
</tr>
<tr>
<td>gitCommit</td>
<td><a href="#string">string</a></td>
<td></td>
<td><p> </p></td>
</tr>
<tr>
<td>branch</td>
<td><a href="#string">string</a></td>
<td></td>
<td><p> </p></td>
</tr>
<tr>
<td>buildDate</td>
<td><a href="#string">string</a></td>
<td></td>
<td><p> </p></td>
</tr>
<tr>
<td>buildUser</td>
<td><a href="#string">string</a></td>
<td></td>
<td><p> </p></td>
</tr>
</tbody>
</table>
@ -1246,6 +1250,58 @@ into a specified block on the next ApplyStaged().</p></td>
<h3 id="cash.z.wallet.sdk.rpc.TreeState">TreeState</h3>
<p>The TreeState is derived from the zcash z_gettreestate rpc.</p>
<table class="field-table">
<thead>
<tr><td>Field</td><td>Type</td><td>Label</td><td>Description</td></tr>
</thead>
<tbody>
<tr>
<td>network</td>
<td><a href="#string">string</a></td>
<td></td>
<td><p>&#34;main&#34; or &#34;test&#34; </p></td>
</tr>
<tr>
<td>height</td>
<td><a href="#uint64">uint64</a></td>
<td></td>
<td><p> </p></td>
</tr>
<tr>
<td>hash</td>
<td><a href="#string">string</a></td>
<td></td>
<td><p>block id </p></td>
</tr>
<tr>
<td>time</td>
<td><a href="#uint32">uint32</a></td>
<td></td>
<td><p>Unix epoch time when the block was mined </p></td>
</tr>
<tr>
<td>tree</td>
<td><a href="#string">string</a></td>
<td></td>
<td><p>sapling commitment tree state </p></td>
</tr>
</tbody>
</table>
<h3 id="cash.z.wallet.sdk.rpc.TxFilter">TxFilter</h3>
<p>A TxFilter contains the information needed to identify a particular</p><p>transaction: either a block and an index, or a direct transaction hash.</p><p>Currently, only specification by hash is supported.</p>
@ -1369,6 +1425,16 @@ match a shortened txid, they are all sent (none is excluded). Transactions
in the exclude list that don&#39;t exist in the mempool are ignored.</p></td>
</tr>
<tr>
<td>GetTreeState</td>
<td><a href="#cash.z.wallet.sdk.rpc.BlockID">BlockID</a></td>
<td><a href="#cash.z.wallet.sdk.rpc.TreeState">TreeState</a></td>
<td><p>GetTreeState returns the note commitment tree state corresponding to the given block.
See section 3.7 of the zcash protocol specification. It returns several other useful
values also (even though they can be obtained using GetBlock).
The block can be specified by either height or hash.</p></td>
</tr>
<tr>
<td>GetLightdInfo</td>
<td><a href="#cash.z.wallet.sdk.rpc.Empty">Empty</a></td>

2
frontend/frontend_test.go
View File

@ -38,7 +38,7 @@ const (
func testsetup() (walletrpc.CompactTxStreamerServer, *common.BlockCache) {
os.RemoveAll(unitTestPath)
cache := common.NewBlockCache(unitTestPath, unitTestChain, 380640, true)
lwd, err := NewLwdStreamer(cache)
lwd, err := NewLwdStreamer(cache, "main")
if err != nil {
os.Stderr.WriteString(fmt.Sprint("NewLwdStreamer failed:", err))
os.Exit(1)

78
frontend/service.go
View File

@ -24,12 +24,13 @@ import (
)
type lwdStreamer struct {
cache *common.BlockCache
cache *common.BlockCache
chainName string
}
// NewLwdStreamer constructs a gRPC context.
func NewLwdStreamer(cache *common.BlockCache) (walletrpc.CompactTxStreamerServer, error) {
return &lwdStreamer{cache}, nil
func NewLwdStreamer(cache *common.BlockCache, chainName string) (walletrpc.CompactTxStreamerServer, error) {
return &lwdStreamer{cache, chainName}, nil
}
// DarksideStreamer holds the gRPC state for darksidewalletd.
@ -90,7 +91,7 @@ func (s *lwdStreamer) GetTaddressTxids(addressBlockFilter *walletrpc.Transparent
// For some reason, the error responses are not JSON
if rpcErr != nil {
common.Log.Errorf("GetTaddressTxids error: %s", rpcErr.Error())
return err
return rpcErr
}
var txids []string
@ -166,6 +167,75 @@ func (s *lwdStreamer) GetBlockRange(span *walletrpc.BlockRange, resp walletrpc.C
}
}
// GetTreeState returns the note commitment tree state corresponding to the given block.
// See section 3.7 of the zcash protocol specification. It returns several other useful
// values also (even though they can be obtained using GetBlock).
// The block can be specified by either height or hash.
func (s *lwdStreamer) GetTreeState(ctx context.Context, id *walletrpc.BlockID) (*walletrpc.TreeState, error) {
if id.Height == 0 && id.Hash == nil {
return nil, errors.New("request for unspecified identifier")
}
// The zcash z_gettreestate rpc accepts either a block height or block hash
params := make([]json.RawMessage, 1)
var hashJSON []byte
if id.Height > 0 {
heightJSON, err := json.Marshal(strconv.Itoa(int(id.Height)))
if err != nil {
return nil, err
}
params[0] = heightJSON
} else {
// id.Hash is big-endian, keep in big-endian for the rpc
hashJSON, err := json.Marshal(hex.EncodeToString(id.Hash))
if err != nil {
return nil, err
}
params[0] = hashJSON
}
var gettreestateReply struct {
Height int
Hash string
Time uint32
Sapling struct {
Commitments struct {
FinalState string
}
SkipHash string
}
}
for {
result, rpcErr := common.RawRequest("z_gettreestate", params)
if rpcErr != nil {
return nil, rpcErr
}
err := json.Unmarshal(result, &gettreestateReply)
if err != nil {
return nil, err
}
if gettreestateReply.Sapling.Commitments.FinalState != "" {
break
}
if gettreestateReply.Sapling.SkipHash == "" {
break
}
hashJSON, err = json.Marshal(gettreestateReply.Sapling.SkipHash)
if err != nil {
return nil, err
}
params[0] = hashJSON
}
if gettreestateReply.Sapling.Commitments.FinalState == "" {
return nil, errors.New("zcashd did not return treestate")
}
return &walletrpc.TreeState{
Network: s.chainName,
Height: uint64(gettreestateReply.Height),
Hash: gettreestateReply.Hash,
Time: gettreestateReply.Time,
Tree: gettreestateReply.Sapling.Commitments.FinalState,
}, nil
}
// GetTransaction returns the raw transaction bytes that are returned
// by the zcashd 'getrawtransaction' RPC.
func (s *lwdStreamer) GetTransaction(ctx context.Context, txf *walletrpc.TxFilter) (*walletrpc.RawTransaction, error) {

312
walletrpc/service.pb.go
View File

@ -888,6 +888,86 @@ func (x *Exclude) GetTxid() [][]byte {
return nil
}
// The TreeState is derived from the zcash z_gettreestate rpc.
type TreeState struct {
state protoimpl.MessageState
sizeCache protoimpl.SizeCache
unknownFields protoimpl.UnknownFields
Network string `protobuf:"bytes,1,opt,name=network,proto3" json:"network,omitempty"` // "main" or "test"
Height uint64 `protobuf:"varint,2,opt,name=height,proto3" json:"height,omitempty"`
Hash string `protobuf:"bytes,3,opt,name=hash,proto3" json:"hash,omitempty"` // block id
Time uint32 `protobuf:"varint,4,opt,name=time,proto3" json:"time,omitempty"` // Unix epoch time when the block was mined
Tree string `protobuf:"bytes,5,opt,name=tree,proto3" json:"tree,omitempty"` // sapling commitment tree state
}
func (x *TreeState) Reset() {
*x = TreeState{}
if protoimpl.UnsafeEnabled {
mi := &file_service_proto_msgTypes[15]
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
ms.StoreMessageInfo(mi)
}
}
func (x *TreeState) String() string {
return protoimpl.X.MessageStringOf(x)
}
func (*TreeState) ProtoMessage() {}
func (x *TreeState) ProtoReflect() protoreflect.Message {
mi := &file_service_proto_msgTypes[15]
if protoimpl.UnsafeEnabled && x != nil {
ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
if ms.LoadMessageInfo() == nil {
ms.StoreMessageInfo(mi)
}
return ms
}
return mi.MessageOf(x)
}
// Deprecated: Use TreeState.ProtoReflect.Descriptor instead.
func (*TreeState) Descriptor() ([]byte, []int) {
return file_service_proto_rawDescGZIP(), []int{15}
}
func (x *TreeState) GetNetwork() string {
if x != nil {
return x.Network
}
return ""
}
func (x *TreeState) GetHeight() uint64 {
if x != nil {
return x.Height
}
return 0
}
func (x *TreeState) GetHash() string {
if x != nil {
return x.Hash
}
return ""
}
func (x *TreeState) GetTime() uint32 {
if x != nil {
return x.Time
}
return 0
}
func (x *TreeState) GetTree() string {
if x != nil {
return x.Tree
}
return ""
}
var File_service_proto protoreflect.FileDescriptor
var file_service_proto_rawDesc = []byte{
@ -969,73 +1049,86 @@ var file_service_proto_rawDesc = []byte{
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}
var (
@ -1050,7 +1143,7 @@ func file_service_proto_rawDescGZIP() []byte {
return file_service_proto_rawDescData
}
var file_service_proto_msgTypes = make([]protoimpl.MessageInfo, 15)
var file_service_proto_msgTypes = make([]protoimpl.MessageInfo, 16)
var file_service_proto_goTypes = []interface{}{
(*BlockID)(nil), // 0: cash.z.wallet.sdk.rpc.BlockID
(*BlockRange)(nil), // 1: cash.z.wallet.sdk.rpc.BlockRange
@ -1067,8 +1160,9 @@ var file_service_proto_goTypes = []interface{}{
(*AddressList)(nil), // 12: cash.z.wallet.sdk.rpc.AddressList
(*Balance)(nil), // 13: cash.z.wallet.sdk.rpc.Balance
(*Exclude)(nil), // 14: cash.z.wallet.sdk.rpc.Exclude
(*CompactBlock)(nil), // 15: cash.z.wallet.sdk.rpc.CompactBlock
(*CompactTx)(nil), // 16: cash.z.wallet.sdk.rpc.CompactTx
(*TreeState)(nil), // 15: cash.z.wallet.sdk.rpc.TreeState
(*CompactBlock)(nil), // 16: cash.z.wallet.sdk.rpc.CompactBlock
(*CompactTx)(nil), // 17: cash.z.wallet.sdk.rpc.CompactTx
}
var file_service_proto_depIdxs = []int32{
0, // 0: cash.z.wallet.sdk.rpc.BlockRange.start:type_name -> cash.z.wallet.sdk.rpc.BlockID
@ -1084,21 +1178,23 @@ var file_service_proto_depIdxs = []int32{
12, // 10: cash.z.wallet.sdk.rpc.CompactTxStreamer.GetTaddressBalance:input_type -> cash.z.wallet.sdk.rpc.AddressList
11, // 11: cash.z.wallet.sdk.rpc.CompactTxStreamer.GetTaddressBalanceStream:input_type -> cash.z.wallet.sdk.rpc.Address
14, // 12: cash.z.wallet.sdk.rpc.CompactTxStreamer.GetMempoolTx:input_type -> cash.z.wallet.sdk.rpc.Exclude
6, // 13: cash.z.wallet.sdk.rpc.CompactTxStreamer.GetLightdInfo:input_type -> cash.z.wallet.sdk.rpc.Empty
9, // 14: cash.z.wallet.sdk.rpc.CompactTxStreamer.Ping:input_type -> cash.z.wallet.sdk.rpc.Duration
0, // 15: cash.z.wallet.sdk.rpc.CompactTxStreamer.GetLatestBlock:output_type -> cash.z.wallet.sdk.rpc.BlockID
15, // 16: cash.z.wallet.sdk.rpc.CompactTxStreamer.GetBlock:output_type -> cash.z.wallet.sdk.rpc.CompactBlock
15, // 17: cash.z.wallet.sdk.rpc.CompactTxStreamer.GetBlockRange:output_type -> cash.z.wallet.sdk.rpc.CompactBlock
3, // 18: cash.z.wallet.sdk.rpc.CompactTxStreamer.GetTransaction:output_type -> cash.z.wallet.sdk.rpc.RawTransaction
4, // 19: cash.z.wallet.sdk.rpc.CompactTxStreamer.SendTransaction:output_type -> cash.z.wallet.sdk.rpc.SendResponse
3, // 20: cash.z.wallet.sdk.rpc.CompactTxStreamer.GetTaddressTxids:output_type -> cash.z.wallet.sdk.rpc.RawTransaction
13, // 21: cash.z.wallet.sdk.rpc.CompactTxStreamer.GetTaddressBalance:output_type -> cash.z.wallet.sdk.rpc.Balance
13, // 22: cash.z.wallet.sdk.rpc.CompactTxStreamer.GetTaddressBalanceStream:output_type -> cash.z.wallet.sdk.rpc.Balance
16, // 23: cash.z.wallet.sdk.rpc.CompactTxStreamer.GetMempoolTx:output_type -> cash.z.wallet.sdk.rpc.CompactTx
7, // 24: cash.z.wallet.sdk.rpc.CompactTxStreamer.GetLightdInfo:output_type -> cash.z.wallet.sdk.rpc.LightdInfo
10, // 25: cash.z.wallet.sdk.rpc.CompactTxStreamer.Ping:output_type -> cash.z.wallet.sdk.rpc.PingResponse
15, // [15:26] is the sub-list for method output_type
4, // [4:15] is the sub-list for method input_type
0, // 13: cash.z.wallet.sdk.rpc.CompactTxStreamer.GetTreeState:input_type -> cash.z.wallet.sdk.rpc.BlockID
6, // 14: cash.z.wallet.sdk.rpc.CompactTxStreamer.GetLightdInfo:input_type -> cash.z.wallet.sdk.rpc.Empty
9, // 15: cash.z.wallet.sdk.rpc.CompactTxStreamer.Ping:input_type -> cash.z.wallet.sdk.rpc.Duration
0, // 16: cash.z.wallet.sdk.rpc.CompactTxStreamer.GetLatestBlock:output_type -> cash.z.wallet.sdk.rpc.BlockID
16, // 17: cash.z.wallet.sdk.rpc.CompactTxStreamer.GetBlock:output_type -> cash.z.wallet.sdk.rpc.CompactBlock
16, // 18: cash.z.wallet.sdk.rpc.CompactTxStreamer.GetBlockRange:output_type -> cash.z.wallet.sdk.rpc.CompactBlock
3, // 19: cash.z.wallet.sdk.rpc.CompactTxStreamer.GetTransaction:output_type -> cash.z.wallet.sdk.rpc.RawTransaction
4, // 20: cash.z.wallet.sdk.rpc.CompactTxStreamer.SendTransaction:output_type -> cash.z.wallet.sdk.rpc.SendResponse
3, // 21: cash.z.wallet.sdk.rpc.CompactTxStreamer.GetTaddressTxids:output_type -> cash.z.wallet.sdk.rpc.RawTransaction
13, // 22: cash.z.wallet.sdk.rpc.CompactTxStreamer.GetTaddressBalance:output_type -> cash.z.wallet.sdk.rpc.Balance
13, // 23: cash.z.wallet.sdk.rpc.CompactTxStreamer.GetTaddressBalanceStream:output_type -> cash.z.wallet.sdk.rpc.Balance
17, // 24: cash.z.wallet.sdk.rpc.CompactTxStreamer.GetMempoolTx:output_type -> cash.z.wallet.sdk.rpc.CompactTx
15, // 25: cash.z.wallet.sdk.rpc.CompactTxStreamer.GetTreeState:output_type -> cash.z.wallet.sdk.rpc.TreeState
7, // 26: cash.z.wallet.sdk.rpc.CompactTxStreamer.GetLightdInfo:output_type -> cash.z.wallet.sdk.rpc.LightdInfo
10, // 27: cash.z.wallet.sdk.rpc.CompactTxStreamer.Ping:output_type -> cash.z.wallet.sdk.rpc.PingResponse
16, // [16:28] is the sub-list for method output_type
4, // [4:16] is the sub-list for method input_type
4, // [4:4] is the sub-list for extension type_name
4, // [4:4] is the sub-list for extension extendee
0, // [0:4] is the sub-list for field type_name
@ -1291,6 +1387,18 @@ func file_service_proto_init() {
return nil
}
}
file_service_proto_msgTypes[15].Exporter = func(v interface{}, i int) interface{} {
switch v := v.(*TreeState); i {
case 0:
return &v.state
case 1:
return &v.sizeCache
case 2:
return &v.unknownFields
default:
return nil
}
}
}
type x struct{}
out := protoimpl.TypeBuilder{
@ -1298,7 +1406,7 @@ func file_service_proto_init() {
GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
RawDescriptor: file_service_proto_rawDesc,
NumEnums: 0,
NumMessages: 15,
NumMessages: 16,
NumExtensions: 0,
NumServices: 1,
},
@ -1348,6 +1456,11 @@ type CompactTxStreamerClient interface {
// match a shortened txid, they are all sent (none is excluded). Transactions
// in the exclude list that don't exist in the mempool are ignored.
GetMempoolTx(ctx context.Context, in *Exclude, opts ...grpc.CallOption) (CompactTxStreamer_GetMempoolTxClient, error)
// GetTreeState returns the note commitment tree state corresponding to the given block.
// See section 3.7 of the zcash protocol specification. It returns several other useful
// values also (even though they can be obtained using GetBlock).
// The block can be specified by either height or hash.
GetTreeState(ctx context.Context, in *BlockID, opts ...grpc.CallOption) (*TreeState, error)
// Return information about this lightwalletd instance and the blockchain
GetLightdInfo(ctx context.Context, in *Empty, opts ...grpc.CallOption) (*LightdInfo, error)
// Testing-only
@ -1537,6 +1650,15 @@ func (x *compactTxStreamerGetMempoolTxClient) Recv() (*CompactTx, error) {
return m, nil
}
func (c *compactTxStreamerClient) GetTreeState(ctx context.Context, in *BlockID, opts ...grpc.CallOption) (*TreeState, error) {
out := new(TreeState)
err := c.cc.Invoke(ctx, "/cash.z.wallet.sdk.rpc.CompactTxStreamer/GetTreeState", in, out, opts...)
if err != nil {
return nil, err
}
return out, nil
}
func (c *compactTxStreamerClient) GetLightdInfo(ctx context.Context, in *Empty, opts ...grpc.CallOption) (*LightdInfo, error) {
out := new(LightdInfo)
err := c.cc.Invoke(ctx, "/cash.z.wallet.sdk.rpc.CompactTxStreamer/GetLightdInfo", in, out, opts...)
@ -1581,6 +1703,11 @@ type CompactTxStreamerServer interface {
// match a shortened txid, they are all sent (none is excluded). Transactions
// in the exclude list that don't exist in the mempool are ignored.
GetMempoolTx(*Exclude, CompactTxStreamer_GetMempoolTxServer) error
// GetTreeState returns the note commitment tree state corresponding to the given block.
// See section 3.7 of the zcash protocol specification. It returns several other useful
// values also (even though they can be obtained using GetBlock).
// The block can be specified by either height or hash.
GetTreeState(context.Context, *BlockID) (*TreeState, error)
// Return information about this lightwalletd instance and the blockchain
GetLightdInfo(context.Context, *Empty) (*LightdInfo, error)
// Testing-only
@ -1618,6 +1745,9 @@ func (*UnimplementedCompactTxStreamerServer) GetTaddressBalanceStream(CompactTxS
func (*UnimplementedCompactTxStreamerServer) GetMempoolTx(*Exclude, CompactTxStreamer_GetMempoolTxServer) error {
return status.Errorf(codes.Unimplemented, "method GetMempoolTx not implemented")
}
func (*UnimplementedCompactTxStreamerServer) GetTreeState(context.Context, *BlockID) (*TreeState, error) {
return nil, status.Errorf(codes.Unimplemented, "method GetTreeState not implemented")
}
func (*UnimplementedCompactTxStreamerServer) GetLightdInfo(context.Context, *Empty) (*LightdInfo, error) {
return nil, status.Errorf(codes.Unimplemented, "method GetLightdInfo not implemented")
}
@ -1808,6 +1938,24 @@ func (x *compactTxStreamerGetMempoolTxServer) Send(m *CompactTx) error {
return x.ServerStream.SendMsg(m)
}
func _CompactTxStreamer_GetTreeState_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
in := new(BlockID)
if err := dec(in); err != nil {
return nil, err
}
if interceptor == nil {
return srv.(CompactTxStreamerServer).GetTreeState(ctx, in)
}
info := &grpc.UnaryServerInfo{
Server: srv,
FullMethod: "/cash.z.wallet.sdk.rpc.CompactTxStreamer/GetTreeState",
}
handler := func(ctx context.Context, req interface{}) (interface{}, error) {
return srv.(CompactTxStreamerServer).GetTreeState(ctx, req.(*BlockID))
}
return interceptor(ctx, in, info, handler)
}
func _CompactTxStreamer_GetLightdInfo_Handler(srv interface{}, ctx context.Context, dec func(interface{}) error, interceptor grpc.UnaryServerInterceptor) (interface{}, error) {
in := new(Empty)
if err := dec(in); err != nil {
@ -1868,6 +2016,10 @@ var _CompactTxStreamer_serviceDesc = grpc.ServiceDesc{
MethodName: "GetTaddressBalance",
Handler: _CompactTxStreamer_GetTaddressBalance_Handler,
},
{
MethodName: "GetTreeState",
Handler: _CompactTxStreamer_GetTreeState_Handler,
},
{
MethodName: "GetLightdInfo",
Handler: _CompactTxStreamer_GetLightdInfo_Handler,

15
walletrpc/service.proto
View File

@ -104,6 +104,15 @@ message Exclude {
repeated bytes txid = 1;
}
// The TreeState is derived from the zcash z_gettreestate rpc.
message TreeState {
string network = 1; // "main" or "test"
uint64 height = 2;
string hash = 3; // block id
uint32 time = 4; // Unix epoch time when the block was mined
string tree = 5; // sapling commitment tree state
}
service CompactTxStreamer {
// Return the height of the tip of the best chain
rpc GetLatestBlock(ChainSpec) returns (BlockID) {}
@ -133,6 +142,12 @@ service CompactTxStreamer {
// in the exclude list that don't exist in the mempool are ignored.
rpc GetMempoolTx(Exclude) returns (stream CompactTx) {}
// GetTreeState returns the note commitment tree state corresponding to the given block.
// See section 3.7 of the zcash protocol specification. It returns several other useful
// values also (even though they can be obtained using GetBlock).
// The block can be specified by either height or hash.
rpc GetTreeState(BlockID) returns (TreeState) {}
// Return information about this lightwalletd instance and the blockchain
rpc GetLightdInfo(Empty) returns (LightdInfo) {}
// Testing-only