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rpc: display for NEP5 token amount properly

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Every NEP5 contract MUST have `decimals` method which
is used to properly display token amount.
This commit is contained in:
Evgenii Stratonikov 2020-03-05 15:39:53 +03:00
parent 95a8fa234f
commit 547bd3bde3
2 changed files with 68 additions and 6 deletions
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68
pkg/rpc/server/server.go
View file

@ -5,6 +5,8 @@ import (
"encoding/hex"
"encoding/json"
"fmt"
"math"
"math/big"
"net/http"
"strconv"
@ -20,6 +22,8 @@ import (
"github.com/nspcc-dev/neo-go/pkg/rpc/response"
"github.com/nspcc-dev/neo-go/pkg/rpc/response/result"
"github.com/nspcc-dev/neo-go/pkg/util"
"github.com/nspcc-dev/neo-go/pkg/vm/emit"
"github.com/nspcc-dev/neo-go/pkg/vm/opcode"
"github.com/pkg/errors"
"go.uber.org/zap"
)
@ -402,8 +406,13 @@ func (s *Server) getNEP5Balances(ps request.Params) (interface{}, error) {
as := s.chain.GetAccountState(u)
bs := &result.NEP5Balances{Address: address.Uint160ToString(u)}
if as != nil {
cache := make(map[util.Uint160]int64)
for h, bal := range as.NEP5Balances {
amount := strconv.FormatInt(bal.Balance, 10)
dec, err := s.getDecimals(h, cache)
if err != nil {
continue
}
amount := amountToString(bal.Balance, dec)
bs.Balances = append(bs.Balances, result.NEP5Balance{
Asset: h,
Amount: amount,
@ -426,6 +435,7 @@ func (s *Server) getNEP5Transfers(ps request.Params) (interface{}, error) {
bs := &result.NEP5Transfers{Address: address.Uint160ToString(u)}
lg := s.chain.GetNEP5TransferLog(u)
cache := make(map[util.Uint160]int64)
err = lg.ForEach(func(tr *state.NEP5Transfer) error {
transfer := result.NEP5Transfer{
Timestamp: tr.Timestamp,
@ -433,8 +443,12 @@ func (s *Server) getNEP5Transfers(ps request.Params) (interface{}, error) {
Index: tr.Block,
TxHash: tr.Tx,
}
d, err := s.getDecimals(tr.Asset, cache)
if err != nil {
return nil
}
if tr.Amount > 0 { // token was received
transfer.Amount = strconv.FormatInt(tr.Amount, 10)
transfer.Amount = amountToString(tr.Amount, d)
if !tr.From.Equals(util.Uint160{}) {
transfer.Address = address.Uint160ToString(tr.From)
}
@ -442,7 +456,7 @@ func (s *Server) getNEP5Transfers(ps request.Params) (interface{}, error) {
return nil
}
transfer.Amount = strconv.FormatInt(-tr.Amount, 10)
transfer.Amount = amountToString(-tr.Amount, d)
if !tr.From.Equals(util.Uint160{}) {
transfer.Address = address.Uint160ToString(tr.To)
}
@ -455,6 +469,54 @@ func (s *Server) getNEP5Transfers(ps request.Params) (interface{}, error) {
return bs, nil
}
func amountToString(amount int64, decimals int64) string {
if decimals == 0 {
return strconv.FormatInt(amount, 10)
}
pow := int64(math.Pow10(int(decimals)))
q := amount / pow
r := amount % pow
if r == 0 {
return strconv.FormatInt(q, 10)
}
fs := fmt.Sprintf("%%d.%%0%dd", decimals)
return fmt.Sprintf(fs, q, r)
}
func (s *Server) getDecimals(h util.Uint160, cache map[util.Uint160]int64) (int64, error) {
if d, ok := cache[h]; ok {
return d, nil
}
w := io.NewBufBinWriter()
emit.Int(w.BinWriter, 0)
emit.Opcode(w.BinWriter, opcode.NEWARRAY)
emit.String(w.BinWriter, "decimals")
emit.AppCall(w.BinWriter, h, true)
v, _ := s.chain.GetTestVM()
v.LoadScript(w.Bytes())
if err := v.Run(); err != nil {
return 0, err
}
res := v.PopResult()
if res == nil {
return 0, errors.New("invalid result")
}
bi, ok := res.(*big.Int)
if !ok {
bs, ok := res.([]byte)
if !ok {
return 0, errors.New("invalid result")
}
bi = emit.BytesToInt(bs)
}
d := bi.Int64()
if d < 0 {
return 0, errors.New("negative decimals")
}
cache[h] = d
return d, nil
}
func (s *Server) getStorage(ps request.Params) (interface{}, error) {
param, ok := ps.Value(0)
if !ok {

6
pkg/rpc/server/server_test.go
View file

@ -165,7 +165,7 @@ var rpcTestCases = map[string][]rpcTestCase{
require.True(t, ok)
require.Equal(t, "AKkkumHbBipZ46UMZJoFynJMXzSRnBvKcs", res.Address)
require.Equal(t, 1, len(res.Balances))
require.Equal(t, "877", res.Balances[0].Amount)
require.Equal(t, "8.77", res.Balances[0].Amount)
require.Equal(t, "d864728bdbc88da799bc43862ae6aaa62adc3a87", res.Balances[0].Asset.StringLE())
require.Equal(t, uint32(208), res.Balances[0].LastUpdated)
},
@ -195,12 +195,12 @@ var rpcTestCases = map[string][]rpcTestCase{
require.NoError(t, err)
require.Equal(t, 1, len(res.Received))
require.Equal(t, "1000", res.Received[0].Amount)
require.Equal(t, "10", res.Received[0].Amount)
require.Equal(t, assetHash, res.Received[0].Asset)
require.Equal(t, address.Uint160ToString(assetHash), res.Received[0].Address)
require.Equal(t, 1, len(res.Sent))
require.Equal(t, "123", res.Sent[0].Amount)
require.Equal(t, "1.23", res.Sent[0].Amount)
require.Equal(t, assetHash, res.Sent[0].Asset)
require.Equal(t, "AWLYWXB8C9Lt1nHdDZJnC5cpYJjgRDLk17", res.Sent[0].Address)
},