mirror of
https://gitlab.com/pulsechaincom/go-pulse.git
synced 2024-12-25 12:57:17 +00:00
705 lines
16 KiB
Go
705 lines
16 KiB
Go
/*
|
|
For each request type, define the following:
|
|
|
|
1. RpcRequest "To" method [message.go], which does basic validation and conversion to "Args" type via json.Decoder()
|
|
2. json.Decoder() calls "UnmarshalON" defined on each "Args" struct
|
|
3. EthereumApi method, taking the "Args" type and replying with an interface to be marshalled to ON
|
|
|
|
*/
|
|
package rpc
|
|
|
|
import (
|
|
"fmt"
|
|
"math/big"
|
|
"strings"
|
|
"sync"
|
|
"time"
|
|
|
|
"github.com/ethereum/go-ethereum/core"
|
|
"github.com/ethereum/go-ethereum/core/types"
|
|
"github.com/ethereum/go-ethereum/crypto"
|
|
"github.com/ethereum/go-ethereum/ethdb"
|
|
"github.com/ethereum/go-ethereum/ethutil"
|
|
"github.com/ethereum/go-ethereum/event"
|
|
"github.com/ethereum/go-ethereum/event/filter"
|
|
"github.com/ethereum/go-ethereum/state"
|
|
"github.com/ethereum/go-ethereum/ui"
|
|
"github.com/ethereum/go-ethereum/xeth"
|
|
)
|
|
|
|
var (
|
|
defaultGasPrice = big.NewInt(10000000000000)
|
|
defaultGas = big.NewInt(10000)
|
|
filterTickerTime = 15 * time.Second
|
|
)
|
|
|
|
type EthereumApi struct {
|
|
eth *xeth.XEth
|
|
xethMu sync.RWMutex
|
|
mux *event.TypeMux
|
|
|
|
quit chan struct{}
|
|
filterManager *filter.FilterManager
|
|
|
|
logMut sync.RWMutex
|
|
logs map[int]*logFilter
|
|
|
|
messagesMut sync.RWMutex
|
|
messages map[int]*whisperFilter
|
|
// Register keeps a list of accounts and transaction data
|
|
regmut sync.Mutex
|
|
register map[string][]*NewTxArgs
|
|
|
|
db ethutil.Database
|
|
|
|
// defaultBlockAge int64
|
|
}
|
|
|
|
func NewEthereumApi(eth *xeth.XEth) *EthereumApi {
|
|
db, _ := ethdb.NewLDBDatabase("dapps")
|
|
api := &EthereumApi{
|
|
eth: eth,
|
|
mux: eth.Backend().EventMux(),
|
|
quit: make(chan struct{}),
|
|
filterManager: filter.NewFilterManager(eth.Backend().EventMux()),
|
|
logs: make(map[int]*logFilter),
|
|
messages: make(map[int]*whisperFilter),
|
|
db: db,
|
|
// defaultBlockAge: -1,
|
|
}
|
|
go api.filterManager.Start()
|
|
go api.start()
|
|
|
|
return api
|
|
}
|
|
|
|
// func (self *EthereumApi) setStateByBlockNumber(num int64) {
|
|
// chain := self.xeth().Backend().ChainManager()
|
|
// var block *types.Block
|
|
|
|
// if self.defaultBlockAge < 0 {
|
|
// num = chain.CurrentBlock().Number().Int64() + num + 1
|
|
// }
|
|
// block = chain.GetBlockByNumber(uint64(num))
|
|
|
|
// if block != nil {
|
|
// self.useState(state.New(block.Root(), self.xeth().Backend().Db()))
|
|
// } else {
|
|
// self.useState(chain.State())
|
|
// }
|
|
// }
|
|
|
|
func (self *EthereumApi) start() {
|
|
timer := time.NewTicker(filterTickerTime)
|
|
// events := self.mux.Subscribe(core.ChainEvent{})
|
|
|
|
done:
|
|
for {
|
|
select {
|
|
// case ev := <-events.Chan():
|
|
// switch ev.(type) {
|
|
// case core.ChainEvent:
|
|
// if self.defaultBlockAge < 0 {
|
|
// self.setStateByBlockNumber(self.defaultBlockAge)
|
|
// }
|
|
// }
|
|
case <-timer.C:
|
|
self.logMut.Lock()
|
|
self.messagesMut.Lock()
|
|
for id, filter := range self.logs {
|
|
if time.Since(filter.timeout) > 20*time.Second {
|
|
self.filterManager.UninstallFilter(id)
|
|
delete(self.logs, id)
|
|
}
|
|
}
|
|
|
|
for id, filter := range self.messages {
|
|
if time.Since(filter.timeout) > 20*time.Second {
|
|
self.xeth().Whisper().Unwatch(id)
|
|
delete(self.messages, id)
|
|
}
|
|
}
|
|
self.logMut.Unlock()
|
|
self.messagesMut.Unlock()
|
|
case <-self.quit:
|
|
break done
|
|
}
|
|
}
|
|
}
|
|
|
|
func (self *EthereumApi) stop() {
|
|
close(self.quit)
|
|
}
|
|
|
|
func (self *EthereumApi) Register(args string, reply *interface{}) error {
|
|
self.regmut.Lock()
|
|
defer self.regmut.Unlock()
|
|
|
|
if _, ok := self.register[args]; ok {
|
|
self.register[args] = nil // register with empty
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (self *EthereumApi) Unregister(args string, reply *interface{}) error {
|
|
self.regmut.Lock()
|
|
defer self.regmut.Unlock()
|
|
|
|
delete(self.register, args)
|
|
|
|
return nil
|
|
}
|
|
|
|
func (self *EthereumApi) WatchTx(args string, reply *interface{}) error {
|
|
self.regmut.Lock()
|
|
defer self.regmut.Unlock()
|
|
|
|
txs := self.register[args]
|
|
self.register[args] = nil
|
|
|
|
*reply = txs
|
|
return nil
|
|
}
|
|
|
|
func (self *EthereumApi) NewFilter(args *FilterOptions, reply *interface{}) error {
|
|
var id int
|
|
filter := core.NewFilter(self.xeth().Backend())
|
|
filter.SetOptions(toFilterOptions(args))
|
|
filter.LogsCallback = func(logs state.Logs) {
|
|
self.logMut.Lock()
|
|
defer self.logMut.Unlock()
|
|
|
|
self.logs[id].add(logs...)
|
|
}
|
|
id = self.filterManager.InstallFilter(filter)
|
|
self.logs[id] = &logFilter{timeout: time.Now()}
|
|
|
|
*reply = id
|
|
|
|
return nil
|
|
}
|
|
|
|
func (self *EthereumApi) UninstallFilter(id int, reply *interface{}) error {
|
|
delete(self.logs, id)
|
|
self.filterManager.UninstallFilter(id)
|
|
*reply = true
|
|
return nil
|
|
}
|
|
|
|
func (self *EthereumApi) NewFilterString(args string, reply *interface{}) error {
|
|
var id int
|
|
filter := core.NewFilter(self.xeth().Backend())
|
|
|
|
callback := func(block *types.Block) {
|
|
self.logMut.Lock()
|
|
defer self.logMut.Unlock()
|
|
|
|
self.logs[id].add(&state.StateLog{})
|
|
}
|
|
if args == "pending" {
|
|
filter.PendingCallback = callback
|
|
} else if args == "chain" {
|
|
filter.BlockCallback = callback
|
|
}
|
|
|
|
id = self.filterManager.InstallFilter(filter)
|
|
self.logs[id] = &logFilter{timeout: time.Now()}
|
|
*reply = id
|
|
|
|
return nil
|
|
}
|
|
|
|
func (self *EthereumApi) FilterChanged(id int, reply *interface{}) error {
|
|
self.logMut.Lock()
|
|
defer self.logMut.Unlock()
|
|
|
|
if self.logs[id] != nil {
|
|
*reply = toLogs(self.logs[id].get())
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (self *EthereumApi) Logs(id int, reply *interface{}) error {
|
|
self.logMut.Lock()
|
|
defer self.logMut.Unlock()
|
|
|
|
filter := self.filterManager.GetFilter(id)
|
|
if filter != nil {
|
|
*reply = toLogs(filter.Find())
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (self *EthereumApi) AllLogs(args *FilterOptions, reply *interface{}) error {
|
|
filter := core.NewFilter(self.xeth().Backend())
|
|
filter.SetOptions(toFilterOptions(args))
|
|
|
|
*reply = toLogs(filter.Find())
|
|
|
|
return nil
|
|
}
|
|
|
|
func (p *EthereumApi) GetBlock(args *GetBlockArgs, reply *interface{}) error {
|
|
// This seems a bit precarious Maybe worth splitting to discrete functions
|
|
if len(args.Hash) > 0 {
|
|
*reply = p.xeth().BlockByHash(args.Hash)
|
|
} else {
|
|
*reply = p.xeth().BlockByNumber(args.BlockNumber)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (p *EthereumApi) Transact(args *NewTxArgs, reply *interface{}) error {
|
|
if len(args.Gas) == 0 {
|
|
args.Gas = defaultGas.String()
|
|
}
|
|
|
|
if len(args.GasPrice) == 0 {
|
|
args.GasPrice = defaultGasPrice.String()
|
|
}
|
|
|
|
// TODO if no_private_key then
|
|
//if _, exists := p.register[args.From]; exists {
|
|
// p.register[args.From] = append(p.register[args.From], args)
|
|
//} else {
|
|
/*
|
|
account := accounts.Get(fromHex(args.From))
|
|
if account != nil {
|
|
if account.Unlocked() {
|
|
if !unlockAccount(account) {
|
|
return
|
|
}
|
|
}
|
|
|
|
result, _ := account.Transact(fromHex(args.To), fromHex(args.Value), fromHex(args.Gas), fromHex(args.GasPrice), fromHex(args.Data))
|
|
if len(result) > 0 {
|
|
*reply = toHex(result)
|
|
}
|
|
} else if _, exists := p.register[args.From]; exists {
|
|
p.register[ags.From] = append(p.register[args.From], args)
|
|
}
|
|
*/
|
|
result, _ := p.xeth().Transact( /* TODO specify account */ args.To, args.Value, args.Gas, args.GasPrice, args.Data)
|
|
*reply = result
|
|
//}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (p *EthereumApi) Call(args *NewTxArgs, reply *interface{}) error {
|
|
result, err := p.xeth().Call( /* TODO specify account */ args.To, args.Value, args.Gas, args.GasPrice, args.Data)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
*reply = result
|
|
return nil
|
|
}
|
|
|
|
func (p *EthereumApi) PushTx(args *PushTxArgs, reply *interface{}) error {
|
|
err := args.requirementsPushTx()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
result, _ := p.xeth().PushTx(args.Tx)
|
|
*reply = result
|
|
return nil
|
|
}
|
|
|
|
func (p *EthereumApi) GetStateAt(args *GetStateArgs, reply *interface{}) error {
|
|
err := args.requirements()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
state := p.xeth().State().SafeGet(args.Address)
|
|
|
|
value := state.StorageString(args.Key)
|
|
var hx string
|
|
if strings.Index(args.Key, "0x") == 0 {
|
|
hx = string([]byte(args.Key)[2:])
|
|
} else {
|
|
// Convert the incoming string (which is a bigint) into hex
|
|
i, _ := new(big.Int).SetString(args.Key, 10)
|
|
hx = ethutil.Bytes2Hex(i.Bytes())
|
|
}
|
|
rpclogger.Debugf("GetStateAt(%s, %s)\n", args.Address, hx)
|
|
*reply = map[string]string{args.Key: value.Str()}
|
|
return nil
|
|
}
|
|
|
|
func (p *EthereumApi) GetStorageAt(args *GetStorageArgs, reply *interface{}) error {
|
|
err := args.requirements()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
*reply = p.xeth().State().SafeGet(args.Address).Storage()
|
|
return nil
|
|
}
|
|
|
|
func (p *EthereumApi) GetPeerCount(reply *interface{}) error {
|
|
*reply = p.xeth().PeerCount()
|
|
return nil
|
|
}
|
|
|
|
func (p *EthereumApi) GetIsListening(reply *interface{}) error {
|
|
*reply = p.xeth().IsListening()
|
|
return nil
|
|
}
|
|
|
|
func (p *EthereumApi) GetCoinbase(reply *interface{}) error {
|
|
*reply = p.xeth().Coinbase()
|
|
return nil
|
|
}
|
|
|
|
func (p *EthereumApi) Accounts(reply *interface{}) error {
|
|
*reply = p.xeth().Accounts()
|
|
return nil
|
|
}
|
|
|
|
func (p *EthereumApi) GetIsMining(reply *interface{}) error {
|
|
*reply = p.xeth().IsMining()
|
|
return nil
|
|
}
|
|
|
|
func (p *EthereumApi) BlockNumber(reply *interface{}) error {
|
|
*reply = p.xeth().Backend().ChainManager().CurrentBlock().Number()
|
|
return nil
|
|
}
|
|
|
|
func (p *EthereumApi) GetTxCountAt(args *GetTxCountArgs, reply *interface{}) error {
|
|
err := args.requirements()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
*reply = p.xeth().TxCountAt(args.Address)
|
|
return nil
|
|
}
|
|
|
|
func (p *EthereumApi) GetBalanceAt(args *GetBalanceArgs, reply *interface{}) error {
|
|
err := args.requirements()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
state := p.xeth().State().SafeGet(args.Address)
|
|
*reply = toHex(state.Balance().Bytes())
|
|
return nil
|
|
}
|
|
|
|
func (p *EthereumApi) GetCodeAt(args *GetCodeAtArgs, reply *interface{}) error {
|
|
err := args.requirements()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
*reply = p.xeth().CodeAt(args.Address)
|
|
return nil
|
|
}
|
|
|
|
func (p *EthereumApi) GetCompilers(reply *interface{}) error {
|
|
c := []string{"serpent"}
|
|
*reply = c
|
|
return nil
|
|
}
|
|
|
|
func (p *EthereumApi) CompileSerpent(script string, reply *interface{}) error {
|
|
res, err := ethutil.Compile(script, false)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
*reply = res
|
|
return nil
|
|
}
|
|
|
|
func (p *EthereumApi) Sha3(args *Sha3Args, reply *interface{}) error {
|
|
*reply = toHex(crypto.Sha3(fromHex(args.Data)))
|
|
return nil
|
|
}
|
|
|
|
func (p *EthereumApi) DbPut(args *DbArgs, reply *interface{}) error {
|
|
err := args.requirements()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
p.db.Put([]byte(args.Database+args.Key), []byte(args.Value))
|
|
*reply = true
|
|
return nil
|
|
}
|
|
|
|
func (p *EthereumApi) DbGet(args *DbArgs, reply *interface{}) error {
|
|
err := args.requirements()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
res, _ := p.db.Get([]byte(args.Database + args.Key))
|
|
*reply = string(res)
|
|
return nil
|
|
}
|
|
|
|
func (p *EthereumApi) NewWhisperIdentity(reply *interface{}) error {
|
|
*reply = p.xeth().Whisper().NewIdentity()
|
|
return nil
|
|
}
|
|
|
|
func (p *EthereumApi) NewWhisperFilter(args *xeth.Options, reply *interface{}) error {
|
|
var id int
|
|
args.Fn = func(msg xeth.WhisperMessage) {
|
|
p.messagesMut.Lock()
|
|
defer p.messagesMut.Unlock()
|
|
p.messages[id].add(msg) // = append(p.messages[id], msg)
|
|
}
|
|
id = p.xeth().Whisper().Watch(args)
|
|
p.messages[id] = &whisperFilter{timeout: time.Now()}
|
|
*reply = id
|
|
return nil
|
|
}
|
|
|
|
func (self *EthereumApi) MessagesChanged(id int, reply *interface{}) error {
|
|
self.messagesMut.Lock()
|
|
defer self.messagesMut.Unlock()
|
|
|
|
if self.messages[id] != nil {
|
|
*reply = self.messages[id].get()
|
|
}
|
|
|
|
return nil
|
|
}
|
|
|
|
func (p *EthereumApi) WhisperPost(args *WhisperMessageArgs, reply *interface{}) error {
|
|
err := p.xeth().Whisper().Post(args.Payload, args.To, args.From, args.Topic, args.Priority, args.Ttl)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
*reply = true
|
|
return nil
|
|
}
|
|
|
|
func (p *EthereumApi) HasWhisperIdentity(args string, reply *interface{}) error {
|
|
*reply = p.xeth().Whisper().HasIdentity(args)
|
|
return nil
|
|
}
|
|
|
|
func (p *EthereumApi) WhisperMessages(id int, reply *interface{}) error {
|
|
*reply = p.xeth().Whisper().Messages(id)
|
|
return nil
|
|
}
|
|
|
|
func (p *EthereumApi) GetRequestReply(req *RpcRequest, reply *interface{}) error {
|
|
// Spec at https://github.com/ethereum/wiki/wiki/Generic-JSON-RPC
|
|
rpclogger.DebugDetailf("%T %s", req.Params, req.Params)
|
|
switch req.Method {
|
|
case "eth_coinbase":
|
|
return p.GetCoinbase(reply)
|
|
case "eth_mining":
|
|
return p.GetIsMining(reply)
|
|
case "eth_number":
|
|
return p.BlockNumber(reply)
|
|
case "eth_accounts":
|
|
return p.Accounts(reply)
|
|
case "eth_countAt":
|
|
args, err := req.ToGetTxCountArgs()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return p.GetTxCountAt(args, reply)
|
|
case "eth_codeAt":
|
|
args, err := req.ToGetCodeAtArgs()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return p.GetCodeAt(args, reply)
|
|
case "eth_balanceAt":
|
|
args, err := req.ToGetBalanceArgs()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return p.GetBalanceAt(args, reply)
|
|
case "eth_stateAt":
|
|
args, err := req.ToGetStateArgs()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return p.GetStateAt(args, reply)
|
|
case "eth_storageAt":
|
|
args, err := req.ToStorageAtArgs()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return p.GetStorageAt(args, reply)
|
|
case "eth_blockByNumber", "eth_blockByHash":
|
|
args, err := req.ToGetBlockArgs()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return p.GetBlock(args, reply)
|
|
case "eth_transact":
|
|
args, err := req.ToNewTxArgs()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return p.Transact(args, reply)
|
|
case "eth_call":
|
|
args, err := req.ToNewTxArgs()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return p.Call(args, reply)
|
|
case "eth_newFilter":
|
|
args, err := req.ToFilterArgs()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return p.NewFilter(args, reply)
|
|
case "eth_newFilterString":
|
|
args, err := req.ToFilterStringArgs()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return p.NewFilterString(args, reply)
|
|
case "eth_uninstallFilter":
|
|
args, err := req.ToUninstallFilterArgs()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return p.UninstallFilter(args, reply)
|
|
case "eth_changed":
|
|
args, err := req.ToIdArgs()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return p.FilterChanged(args, reply)
|
|
case "eth_filterLogs":
|
|
args, err := req.ToIdArgs()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return p.Logs(args, reply)
|
|
case "eth_logs":
|
|
args, err := req.ToFilterArgs()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return p.AllLogs(args, reply)
|
|
case "eth_gasPrice":
|
|
*reply = toHex(defaultGasPrice.Bytes())
|
|
return nil
|
|
case "eth_register":
|
|
args, err := req.ToRegisterArgs()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return p.Register(args, reply)
|
|
case "eth_unregister":
|
|
args, err := req.ToRegisterArgs()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return p.Unregister(args, reply)
|
|
case "eth_watchTx":
|
|
args, err := req.ToWatchTxArgs()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return p.WatchTx(args, reply)
|
|
case "eth_compilers":
|
|
return p.GetCompilers(reply)
|
|
case "eth_serpent":
|
|
args, err := req.ToCompileArgs()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return p.CompileSerpent(args, reply)
|
|
case "web3_sha3":
|
|
args, err := req.ToSha3Args()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return p.Sha3(args, reply)
|
|
case "db_put":
|
|
args, err := req.ToDbPutArgs()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return p.DbPut(args, reply)
|
|
case "db_get":
|
|
args, err := req.ToDbGetArgs()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return p.DbGet(args, reply)
|
|
case "net_listening":
|
|
return p.GetIsListening(reply)
|
|
case "net_peerCount":
|
|
return p.GetPeerCount(reply)
|
|
case "shh_newIdentity":
|
|
return p.NewWhisperIdentity(reply)
|
|
case "shh_newFilter":
|
|
args, err := req.ToWhisperFilterArgs()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return p.NewWhisperFilter(args, reply)
|
|
case "shh_changed":
|
|
args, err := req.ToIdArgs()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return p.MessagesChanged(args, reply)
|
|
case "shh_post":
|
|
args, err := req.ToWhisperPostArgs()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return p.WhisperPost(args, reply)
|
|
case "shh_haveIdentity":
|
|
args, err := req.ToWhisperHasIdentityArgs()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return p.HasWhisperIdentity(args, reply)
|
|
case "shh_getMessages":
|
|
args, err := req.ToIdArgs()
|
|
if err != nil {
|
|
return err
|
|
}
|
|
return p.WhisperMessages(args, reply)
|
|
case "client_version":
|
|
*reply = p.eth.GetClientVersion()
|
|
default:
|
|
return NewErrorWithMessage(errNotImplemented, req.Method)
|
|
}
|
|
|
|
rpclogger.DebugDetailf("Reply: %T %s", reply, reply)
|
|
return nil
|
|
}
|
|
|
|
func (self *EthereumApi) xeth() *xeth.XEth {
|
|
self.xethMu.RLock()
|
|
defer self.xethMu.RUnlock()
|
|
|
|
return self.eth
|
|
}
|
|
|
|
func (self *EthereumApi) useState(statedb *state.StateDB) {
|
|
self.xethMu.Lock()
|
|
defer self.xethMu.Unlock()
|
|
|
|
self.eth = self.eth.UseState(statedb)
|
|
}
|
|
|
|
func t(f ui.Frontend) {
|
|
// Call the password dialog
|
|
ret, err := f.Call("PasswordDialog")
|
|
if err != nil {
|
|
fmt.Println(err)
|
|
}
|
|
// Get the first argument
|
|
t, _ := ret.Get(0)
|
|
fmt.Println("return:", t)
|
|
}
|