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dapp_chain_rpc_client.go
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dapp_chain_rpc_client.go
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package client
import (
"encoding/hex"
"fmt"
"math/big"
"strings"
"time"
"net/http"
"strconv"
"github.com/gogo/protobuf/proto"
"github.com/loomnetwork/go-loom"
"github.com/loomnetwork/go-loom/auth"
"github.com/loomnetwork/go-loom/common"
ptypes "github.com/loomnetwork/go-loom/plugin/types"
"github.com/loomnetwork/go-loom/types"
"github.com/loomnetwork/go-loom/vm"
"github.com/pkg/errors"
)
const (
ShortPollLimit = 10
ShortPollDelay = 1 * time.Second
CodeTypeOK = 0
)
type TxHandlerResult struct {
Code int32 `json:"code"`
Error string `json:"log"`
Data []byte `json:"data"`
}
type BoradcastTxSyncResult struct {
Code int32 `json:"code"`
Data []byte `json:"data"`
Hash string `json:"hash"`
Error string `json:"log"`
}
type TxQueryResult struct {
TxResult TxHandlerResult `json:"tx_result"`
}
type BroadcastTxCommitResult struct {
CheckTx TxHandlerResult `json:"check_tx"`
DeliverTx TxHandlerResult `json:"deliver_tx"`
Hash string `json:"hash"`
Height string `json:"height"`
}
// Implements the DAppChainClient interface
type DAppChainRPCClient struct {
chainID string
writeURI string
readURI string
txClient *JSONRPCClient
queryClient *JSONRPCClient
nextRequestID uint64
}
// NewDAppChainRPCClient creates a new dumb client that can be used to commit txs and query contract
// state via RPC.
// URI parameters should be specified as "tcp://<host>:<port>", writeURI the host that txs will be
// submitted to (port 46657 by default), readURI is the host that will be queried for current app
// state (47000 by default).
func NewDAppChainRPCClient(chainID, writeURI, readURI string) *DAppChainRPCClient {
return &DAppChainRPCClient{
chainID: chainID,
writeURI: writeURI,
readURI: readURI,
txClient: NewJSONRPCClient(writeURI),
queryClient: NewJSONRPCClient(readURI),
nextRequestID: 1,
}
}
func NewDAppChainRPCClientShareTransport(chainID, writeURI, readURI string, transport *http.Transport) *DAppChainRPCClient {
return &DAppChainRPCClient{
chainID: chainID,
writeURI: writeURI,
readURI: readURI,
txClient: NewJSONRPCClientShareTransport(writeURI, transport),
queryClient: NewJSONRPCClientShareTransport(readURI, transport),
nextRequestID: 1,
}
}
func (c *DAppChainRPCClient) CloseIdleConnections() {
c.txClient.client.Transport.(*http.Transport).CloseIdleConnections()
c.queryClient.client.Transport.(*http.Transport).CloseIdleConnections()
}
func (c *DAppChainRPCClient) getNextRequestID() string {
id := strconv.FormatUint(c.nextRequestID, 10)
c.nextRequestID++
return id
}
func (c *DAppChainRPCClient) GetChainID() string {
return c.chainID
}
// GetNonce queries the chain for the nonce of the last commited tx signed by the the given signer.
func (c *DAppChainRPCClient) GetNonce(signer auth.Signer) (uint64, error) {
return c.GetNonce2(loom.Address{}, signer)
}
// GetNonce2 queries the chain for the nonce of the last commited tx sent by the given account.
func (c *DAppChainRPCClient) GetNonce2(caller loom.Address, signer auth.Signer) (uint64, error) {
// TODO: Currently if both the caller & key are specified then both are sent in the request,
// this is done to maintain compatibility with older loomchain builds.
// Newer loomchain builds will ignore the key param if the account param is set,
// while older builds will only look at the key param. Further down the line the key
// param should be removed.
params := map[string]interface{}{}
if !caller.IsEmpty() {
params["account"] = caller.String()
}
if signer != nil {
params["key"] = hex.EncodeToString(signer.PublicKey())
}
var rRes string
err := c.queryClient.Call("nonce", params, c.getNextRequestID(), &rRes)
if err != nil {
return 0, err
}
return strconv.ParseUint(rRes, 10, 64)
}
// CommitTx signs a tx with the given signer and sends it to the chain.
func (c *DAppChainRPCClient) CommitTx(signer auth.Signer, tx proto.Message) ([]byte, error) {
return c.CommitTx2(loom.Address{}, signer, tx)
}
// CommitTx2 signs a tx with the given signer and sends it to the chain, the from address is used to
// query the chain for a tx nonce (this address may have a different chain ID to the client).
func (c *DAppChainRPCClient) CommitTx2(from loom.Address, signer auth.Signer, tx proto.Message) ([]byte, error) {
// TODO: signing & noncing should be handled by middleware
nonce, err := c.GetNonce2(from, signer)
if err != nil {
return nil, err
}
txBytes, err := proto.Marshal(tx)
if err != nil {
return nil, err
}
nonceTxBytes, err := proto.Marshal(&auth.NonceTx{
Inner: txBytes,
Sequence: nonce + 1,
})
if err != nil {
return nil, err
}
signedTxBytes, err := proto.Marshal(auth.SignTx(signer, nonceTxBytes))
if err != nil {
return nil, err
}
params := map[string]interface{}{
"tx": signedTxBytes,
}
var r BoradcastTxSyncResult
if err = c.txClient.Call("broadcast_tx_sync", params, c.getNextRequestID(), &r); err != nil {
return nil, err
}
if r.Code != CodeTypeOK {
if len(r.Error) != 0 {
return nil, errors.New(r.Error)
}
return nil, fmt.Errorf("CheckTx failed")
}
txResult, err := c.pollTx(r.Hash, ShortPollLimit, ShortPollDelay)
if err != nil {
return nil, err
}
return txResult.Data, nil
}
func (c *DAppChainRPCClient) pollTx(hash string, shortPollLimit int, shortPollDelay time.Duration) (*TxHandlerResult, error) {
var result TxQueryResult
var err error
decodedHash, err := hex.DecodeString(hash)
if err != nil {
return nil, errors.Wrapf(err, "error while polling for tx")
}
params := map[string]interface{}{
"hash": decodedHash,
}
for i := 0; i < shortPollLimit; i++ {
// Delaying in beginning of the loop, as immediate poll will likely result in "not found"
time.Sleep(shortPollDelay)
if err = c.txClient.Call("tx", params, c.getNextRequestID(), &result); err != nil {
if !strings.Contains(err.Error(), "not found") {
// Bailing early if error is due to something other than pending tx.
return nil, errors.Wrap(err, "error while polling for tx")
}
} else {
if result.TxResult.Code != CodeTypeOK {
if len(result.TxResult.Error) != 0 {
return nil, errors.New(result.TxResult.Error)
}
return nil, fmt.Errorf("DeliverTx failed")
}
break
}
}
if err != nil {
return nil, errors.Wrap(err, "max retry exceeded while polling for tx")
}
return &result.TxResult, nil
}
func (c *DAppChainRPCClient) Query(caller loom.Address, contractAddr loom.LocalAddress, query proto.Message) ([]byte, error) {
queryBytes, err := proto.Marshal(query)
if err != nil {
return nil, err
}
params := map[string]interface{}{
"caller": caller.String(),
"contract": contractAddr.String(),
"query": queryBytes,
"vmType": vm.VMType_PLUGIN,
}
var r []byte
if err = c.queryClient.Call("query", params, c.getNextRequestID(), &r); err != nil {
return nil, err
}
return r, nil
}
func (c *DAppChainRPCClient) Resolve(name string) (loom.Address, error) {
params := map[string]interface{}{
"name": name,
}
var addrStr string
if err := c.queryClient.Call("resolve", params, c.getNextRequestID(), &addrStr); err != nil {
return loom.Address{}, err
}
return loom.ParseAddress(addrStr)
}
// GetCode returns the runtime byte-code of a contract running on a DAppChain's EVM.
// Gives an error for non-EVM contracts.
// contract - address of the contract in the form of a string. (Use loom.Address.String() to convert)
// return []byte - runtime bytecode of the contract.
func (c *DAppChainRPCClient) GetEvmCode(contract string) ([]byte, error) {
params := map[string]interface{}{
"contract": contract,
}
var bytecode []byte
if err := c.queryClient.Call("getevmcode", params, c.getNextRequestID(), &bytecode); err != nil {
return []byte{}, err
}
return bytecode, nil
}
func (c *DAppChainRPCClient) GetEvmLogs(filter string) (ptypes.EthFilterLogList, error) {
params := map[string]interface{}{
"filter": filter,
}
var r []byte
if err := c.queryClient.Call("getevmlogs", params, c.getNextRequestID(), &r); err != nil {
return ptypes.EthFilterLogList{}, err
}
var logs ptypes.EthFilterLogList
if err := proto.Unmarshal(r, &logs); err != nil {
return ptypes.EthFilterLogList{}, err
}
return logs, nil
}
// Sets up new filter for polling
// https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_newfilter
func (c *DAppChainRPCClient) NewEvmFilter(filter string) (string, error) {
params := map[string]interface{}{
"filter": filter,
}
var id string
if err := c.queryClient.Call("newevmfilter", params, c.getNextRequestID(), &id); err != nil {
return "", err
}
return id, nil
}
// https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_newblockfilter
func (c *DAppChainRPCClient) NewBlockEvmFilter() (string, error) {
params := map[string]interface{}{}
var id string
if err := c.queryClient.Call("newblockevmfilter", params, c.getNextRequestID(), &id); err != nil {
return "", err
}
return id, nil
}
// https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_newpendingtransactionfilter
func (c *DAppChainRPCClient) NewPendingTransactionEvmFilter() (string, error) {
params := map[string]interface{}{}
var id string
if err := c.queryClient.Call("newpendingtransactionevmfilter", params, c.getNextRequestID(), &id); err != nil {
return "", err
}
return id, nil
}
// Get logs since last poll
// https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_getfilterchanges
// could return protbuf of EthFilterLogList, EthBlockHashList or EthTxHashList
func (c *DAppChainRPCClient) GetEvmFilterChanges(id string) ([]byte, error) {
params := map[string]interface{}{
"id": id,
}
var r []byte
if err := c.queryClient.Call("getevmfilterchanges", params, c.getNextRequestID(), &r); err != nil {
return nil, err
}
return r, nil
}
// Forget filter
// https://github.com/ethereum/wiki/wiki/JSON-RPC#eth_uninstallfilter
func (c *DAppChainRPCClient) UninstallEvmFilter(id string) (bool, error) {
params := map[string]interface{}{
"id": id,
}
var ok bool
if err := c.queryClient.Call("uninstallevmfilter", params, c.getNextRequestID(), &ok); err != nil {
return ok, err
}
return ok, nil
}
func (c *DAppChainRPCClient) GetEvmBlockByNumber(number string, full bool) (ptypes.EthBlockInfo, error) {
params := map[string]interface{}{
"number": number,
"full": full,
}
var r []byte
if err := c.queryClient.Call("getevmblockbynumber", params, c.getNextRequestID(), &r); err != nil {
return ptypes.EthBlockInfo{}, err
}
var blockInfo ptypes.EthBlockInfo
if err := proto.Unmarshal(r, &blockInfo); err != nil {
return ptypes.EthBlockInfo{}, err
}
return blockInfo, nil
}
func (c *DAppChainRPCClient) GetEvmBlockByHash(hash []byte, full bool) (ptypes.EthBlockInfo, error) {
params := map[string]interface{}{
"hash": hash,
"full": full,
}
var r []byte
if err := c.queryClient.Call("getevmblockbyhash", params, c.getNextRequestID(), &r); err != nil {
return ptypes.EthBlockInfo{}, err
}
var blockInfo ptypes.EthBlockInfo
if err := proto.Unmarshal(r, &blockInfo); err != nil {
return ptypes.EthBlockInfo{}, err
}
return blockInfo, nil
}
func (c *DAppChainRPCClient) GetEvmTransactionByHash(hash []byte) (ptypes.EvmTxObject, error) {
params := map[string]interface{}{
"hash": hash,
}
var r []byte
if err := c.queryClient.Call("getevmtransactionbyhash", params, c.getNextRequestID(), &r); err != nil {
return ptypes.EvmTxObject{}, err
}
var txInfo ptypes.EvmTxObject
if err := proto.Unmarshal(r, &txInfo); err != nil {
return ptypes.EvmTxObject{}, err
}
return txInfo, nil
}
func (c *DAppChainRPCClient) QueryEvm(caller loom.Address, contractAddr loom.LocalAddress, query []byte) ([]byte, error) {
params := map[string]interface{}{
"caller": caller.String(),
"contract": contractAddr.String(),
"query": query,
"vmType": vm.VMType_EVM,
}
var r []byte
if err := c.queryClient.Call("query", params, c.getNextRequestID(), &r); err != nil {
return nil, err
}
return r, nil
}
func (c *DAppChainRPCClient) GetEvmTxReceipt(txHash []byte) (ptypes.EvmTxReceipt, error) {
params := map[string]interface{}{
"txHash": txHash,
}
var r []byte
if err := c.queryClient.Call("evmtxreceipt", params, c.getNextRequestID(), &r); err != nil {
return ptypes.EvmTxReceipt{}, err
}
var receipt ptypes.EvmTxReceipt
err := proto.Unmarshal(r, &receipt)
return receipt, err
}
func (c *DAppChainRPCClient) GetContractEvents(fromBlock, toBlock uint64, contractName string) (ptypes.ContractEventsResult, error) {
var result ptypes.ContractEventsResult
params := map[string]interface{}{
"fromBlock": strconv.FormatUint(fromBlock, 10),
"toBlock": strconv.FormatUint(toBlock, 10),
"contract": contractName,
}
if err := c.queryClient.Call("contractevents", params, c.getNextRequestID(), &result); err != nil {
return result, err
}
return result, nil
}
func (c *DAppChainRPCClient) GetContractRecord(contract loom.Address) (ptypes.ContractRecordResponse, error) {
params := map[string]interface{}{
"contract": contract.String(),
}
var record ptypes.ContractRecordResponse
if err := c.queryClient.Call("contractrecord", params, c.getNextRequestID(), &record); err != nil {
return record, err
}
return record, nil
}
func (c *DAppChainRPCClient) GetBlockHeight() (uint64, error) {
var result string
params := map[string]interface{}{}
if err := c.queryClient.Call("getblockheight", params, c.getNextRequestID(), &result); err != nil {
return 0, err
}
n, err := strconv.ParseUint(result, 10, 64)
if err != nil {
return 0, err
}
return n, nil
}
func (c *DAppChainRPCClient) CommitDeployTx(
from loom.Address,
signer auth.Signer,
vmType vm.VMType,
code []byte,
name string,
) ([]byte, error) {
return c.CommitDeployTxWithValue(
from,
signer,
vmType,
code,
name,
big.NewInt(0),
)
}
func (c *DAppChainRPCClient) CommitDeployTxWithValue(
from loom.Address,
signer auth.Signer,
vmType vm.VMType,
code []byte,
name string,
value *big.Int,
) ([]byte, error) {
deployTxBytes, err := proto.Marshal(&vm.DeployTx{
VmType: vmType,
Code: code,
Name: name,
Value: &types.BigUInt{Value: common.BigUInt{value}},
})
if err != nil {
return nil, err
}
msgBytes, err := proto.Marshal(&vm.MessageTx{
From: from.MarshalPB(),
To: loom.Address{}.MarshalPB(), // not used
Data: deployTxBytes,
})
if err != nil {
return nil, err
}
tx := &types.Transaction{
Id: 1,
Data: msgBytes,
}
return c.CommitTx2(from, signer, tx)
}
func (c *DAppChainRPCClient) CommitMigrationTx(
from loom.Address,
signer auth.Signer,
id uint32,
input []byte,
) ([]byte, error) {
migrationTxBytes, err := proto.Marshal(&vm.MigrationTx{
ID: id,
Input: input,
})
if err != nil {
return nil, err
}
msgBytes, err := proto.Marshal(&vm.MessageTx{
From: from.MarshalPB(),
Data: migrationTxBytes,
})
if err != nil {
return nil, err
}
tx := &types.Transaction{
Id: 3,
Data: msgBytes,
}
return c.CommitTx2(from, signer, tx)
}
func (c *DAppChainRPCClient) CommitCallTx(
caller loom.Address,
contract loom.Address,
signer auth.Signer,
vmType vm.VMType,
input []byte,
) ([]byte, error) {
return c.CommitCallTxWithValue(
caller,
contract,
signer,
vmType,
input,
big.NewInt(0),
)
}
func (c *DAppChainRPCClient) CommitCallTxWithValue(
caller loom.Address,
contract loom.Address,
signer auth.Signer,
vmType vm.VMType,
input []byte,
value *big.Int,
) ([]byte, error) {
callTxBytes, err := proto.Marshal(&vm.CallTx{
VmType: vm.VMType(vmType),
Input: input,
Value: &types.BigUInt{Value: common.BigUInt{value}},
})
if err != nil {
return nil, err
}
msgTx := &vm.MessageTx{
From: caller.MarshalPB(),
To: contract.MarshalPB(),
Data: callTxBytes,
}
msgBytes, err := proto.Marshal(msgTx)
if err != nil {
return nil, err
}
// tx ids associated with handlers in loadApp()
tx := &types.Transaction{
Id: 2,
Data: msgBytes,
}
return c.CommitTx2(caller, signer, tx)
}