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client.go
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client.go
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package bandlib
import (
"fmt"
"time"
"github.com/cosmos/cosmos-sdk/client/context"
"github.com/cosmos/cosmos-sdk/client/flags"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/tendermint/tendermint/crypto"
)
type msgDetail struct {
msg sdk.Msg
gas uint64
fees sdk.Coins
txChan chan sdk.TxResponse
errChan chan error
}
// BandStatefulClient contains state client
type BandStatefulClient struct {
memo string
maximumMsgPerTx int
provider BandProvider
msgChan chan msgDetail
msgs []sdk.Msg
totalGas uint64
totalFees sdk.Coins
txChans []chan sdk.TxResponse
errChans []chan error
readMode <-chan struct{}
readModeBackUp <-chan struct{}
}
// NewBandStatefulClient creates new instance of BandStatefulClient.
func NewBandStatefulClient(
nodeURI string, privKey crypto.PrivKey, msgCap, maximumMsgPerTx int, memo string,
) (BandStatefulClient, error) {
provider, err := NewBandProvider(nodeURI, privKey)
if err != nil {
return BandStatefulClient{}, err
}
ch := make(chan struct{})
close(ch)
client := BandStatefulClient{
provider: provider,
msgChan: make(chan msgDetail, msgCap),
maximumMsgPerTx: maximumMsgPerTx,
memo: memo,
readMode: ch,
readModeBackUp: ch,
}
go client.loop()
return client, nil
}
func (client *BandStatefulClient) SendTransaction(
msg sdk.Msg, gas uint64, fees string, gasPrice string,
) (sdk.TxResponse, error) {
// Add msg to channel
parsedFees, err := sdk.ParseCoins(fees)
if err != nil {
return sdk.TxResponse{}, err
}
if parsedFees.IsZero() {
parsedGasPrice, err := sdk.ParseDecCoins(gasPrice)
if err != nil {
return sdk.TxResponse{}, err
}
parsedFees, _ = parsedGasPrice.MulDec(sdk.NewDec(int64(gas))).TruncateDecimal()
}
txChan := make(chan sdk.TxResponse, 0)
errChan := make(chan error, 0)
client.msgChan <- msgDetail{
msg: msg, gas: gas, fees: parsedFees,
txChan: txChan, errChan: errChan,
}
select {
case txResponse := <-txChan:
return txResponse, nil
case err := <-errChan:
return sdk.TxResponse{}, err
}
}
func (client *BandStatefulClient) Sender() sdk.AccAddress {
return client.provider.Sender()
}
func (client *BandStatefulClient) GetContext() context.CLIContext {
return client.provider.cliCtx
}
func (client *BandStatefulClient) loop() {
for {
select {
case <-client.readMode:
{
select {
case msg := <-client.msgChan:
{
client.msgs = append(client.msgs, msg.msg)
client.totalGas += msg.gas
client.totalFees = client.totalFees.Add(msg.fees)
client.txChans = append(client.txChans, msg.txChan)
client.errChans = append(client.errChans, msg.errChan)
if len(client.msgs) == client.maximumMsgPerTx {
client.readMode = nil
}
}
case <-time.After(100 * time.Millisecond):
{
if len(client.msgs) != 0 {
client.readMode = nil
}
}
}
}
default:
{
seq, err := client.provider.GetSequenceFromChain()
if err != nil {
// TODO: error handler
fmt.Println(err)
continue
}
tx, err := client.provider.SendTransaction(
client.msgs,
seq,
client.totalGas,
client.memo,
client.totalFees.String(),
flags.BroadcastBlock,
)
if err != nil {
for _, errChan := range client.errChans {
errChan <- err
}
} else {
for _, txChan := range client.txChans {
txChan <- tx
}
}
// Clear state
client.readMode = client.readModeBackUp
client.msgs = []sdk.Msg{}
client.totalGas = uint64(0)
client.totalFees = sdk.Coins{}
client.txChans = []chan sdk.TxResponse{}
client.errChans = []chan error{}
}
}
}
}