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client.go
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client.go
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package client
import (
"bytes"
"context"
"errors"
"fmt"
"io"
"os"
"time"
"github.com/cosmos/cosmos-sdk/client"
"github.com/cosmos/cosmos-sdk/client/flags"
"github.com/cosmos/cosmos-sdk/client/rpc"
"github.com/cosmos/cosmos-sdk/client/tx"
"github.com/cosmos/cosmos-sdk/crypto/keyring"
"github.com/cosmos/cosmos-sdk/telemetry"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/cosmos/cosmos-sdk/types/tx/signing"
authtypes "github.com/cosmos/cosmos-sdk/x/auth/types"
"github.com/rs/zerolog"
rpchttp "github.com/tendermint/tendermint/rpc/client/http"
tmjsonclient "github.com/tendermint/tendermint/rpc/jsonrpc/client"
nebulaapp "github.com/tessornetwork/nebula/app"
nebulaparams "github.com/tessornetwork/nebula/app/params"
)
type (
// OracleClient defines a structure that interfaces with the Nebula node.
OracleClient struct {
Logger zerolog.Logger
ChainID string
KeyringBackend string
KeyringDir string
KeyringPass string
TMRPC string
RPCTimeout time.Duration
OracleAddr sdk.AccAddress
OracleAddrString string
ValidatorAddr sdk.ValAddress
ValidatorAddrString string
Encoding nebulaparams.EncodingConfig
GasPrices string
GasAdjustment float64
GRPCEndpoint string
KeyringPassphrase string
ChainHeight *ChainHeight
}
passReader struct {
pass string
buf *bytes.Buffer
}
)
func NewOracleClient(
ctx context.Context,
logger zerolog.Logger,
chainID string,
keyringBackend string,
keyringDir string,
keyringPass string,
tmRPC string,
rpcTimeout time.Duration,
oracleAddrString string,
validatorAddrString string,
grpcEndpoint string,
gasAdjustment float64,
) (OracleClient, error) {
oracleAddr, err := sdk.AccAddressFromBech32(oracleAddrString)
if err != nil {
return OracleClient{}, err
}
oracleClient := OracleClient{
Logger: logger.With().Str("module", "oracle_client").Logger(),
ChainID: chainID,
KeyringBackend: keyringBackend,
KeyringDir: keyringDir,
KeyringPass: keyringPass,
TMRPC: tmRPC,
RPCTimeout: rpcTimeout,
OracleAddr: oracleAddr,
OracleAddrString: oracleAddrString,
ValidatorAddr: sdk.ValAddress(validatorAddrString),
ValidatorAddrString: validatorAddrString,
Encoding: nebulaapp.MakeEncodingConfig(),
GasAdjustment: gasAdjustment,
GRPCEndpoint: grpcEndpoint,
}
clientCtx, err := oracleClient.CreateClientContext()
if err != nil {
return OracleClient{}, err
}
blockHeight, err := rpc.GetChainHeight(clientCtx)
if err != nil {
return OracleClient{}, err
}
chainHeight, err := NewChainHeight(
ctx,
clientCtx.Client,
oracleClient.Logger,
blockHeight,
)
if err != nil {
return OracleClient{}, err
}
oracleClient.ChainHeight = chainHeight
return oracleClient, nil
}
func newPassReader(pass string) io.Reader {
return &passReader{
pass: pass,
buf: new(bytes.Buffer),
}
}
func (r *passReader) Read(p []byte) (n int, err error) {
n, err = r.buf.Read(p)
if err == io.EOF || n == 0 {
r.buf.WriteString(r.pass + "\n")
n, err = r.buf.Read(p)
}
return n, err
}
// BroadcastTx attempts to broadcast a signed transaction. If it fails, a few re-attempts
// will be made until the transaction succeeds or ultimately times out or fails.
// Ref: https://github.com/terra-money/oracle-feeder/blob/baef2a4a02f57a2ffeaa207932b2e03d7fb0fb25/feeder/src/vote.ts#L230
func (oc OracleClient) BroadcastTx(nextBlockHeight, timeoutHeight int64, msgs ...sdk.Msg) error {
maxBlockHeight := nextBlockHeight + timeoutHeight
lastCheckHeight := nextBlockHeight - 1
clientCtx, err := oc.CreateClientContext()
if err != nil {
return err
}
factory, err := oc.CreateTxFactory()
if err != nil {
return err
}
// re-try voting until timeout
for lastCheckHeight < maxBlockHeight {
latestBlockHeight, err := oc.ChainHeight.GetChainHeight()
if err != nil {
return err
}
if latestBlockHeight <= lastCheckHeight {
continue
}
// set last check height to latest block height
lastCheckHeight = latestBlockHeight
resp, err := BroadcastTx(clientCtx, factory, msgs...)
if resp != nil && resp.Code != 0 {
telemetry.IncrCounter(1, "failure", "tx", "code")
err = fmt.Errorf("invalid response code from tx: %d", resp.Code)
}
if err != nil {
var (
code uint32
hash string
)
if resp != nil {
code = resp.Code
hash = resp.TxHash
}
oc.Logger.Debug().
Err(err).
Int64("max_height", maxBlockHeight).
Int64("last_check_height", lastCheckHeight).
Str("tx_hash", hash).
Uint32("tx_code", code).
Msg("failed to broadcast tx; retrying...")
time.Sleep(time.Second * 1)
continue
}
oc.Logger.Info().
Uint32("tx_code", resp.Code).
Str("tx_hash", resp.TxHash).
Int64("tx_height", resp.Height).
Msg("successfully broadcasted tx")
return nil
}
telemetry.IncrCounter(1, "failure", "tx", "timeout")
return errors.New("broadcasting tx timed out")
}
// CreateClientContext creates an SDK client Context instance used for transaction
// generation, signing and broadcasting.
func (oc OracleClient) CreateClientContext() (client.Context, error) {
var keyringInput io.Reader
if len(oc.KeyringPass) > 0 {
keyringInput = newPassReader(oc.KeyringPass)
} else {
keyringInput = os.Stdin
}
kr, err := keyring.New("oracle", oc.KeyringBackend, oc.KeyringDir, keyringInput, oc.Encoding.Codec)
if err != nil {
return client.Context{}, err
}
httpClient, err := tmjsonclient.DefaultHTTPClient(oc.TMRPC)
if err != nil {
return client.Context{}, err
}
httpClient.Timeout = oc.RPCTimeout
tmRPC, err := rpchttp.NewWithClient(oc.TMRPC, "/websocket", httpClient)
if err != nil {
return client.Context{}, err
}
keyInfo, err := kr.KeyByAddress(oc.OracleAddr)
if err != nil {
return client.Context{}, err
}
clientCtx := client.Context{
ChainID: oc.ChainID,
InterfaceRegistry: oc.Encoding.InterfaceRegistry,
Output: os.Stderr,
BroadcastMode: flags.BroadcastSync,
TxConfig: oc.Encoding.TxConfig,
AccountRetriever: authtypes.AccountRetriever{},
Codec: oc.Encoding.Codec,
LegacyAmino: oc.Encoding.Amino,
Input: os.Stdin,
NodeURI: oc.TMRPC,
Client: tmRPC,
Keyring: kr,
FromAddress: oc.OracleAddr,
FromName: keyInfo.Name,
From: keyInfo.Name,
OutputFormat: "json",
UseLedger: false,
Simulate: false,
GenerateOnly: false,
Offline: false,
SkipConfirm: true,
}
return clientCtx, nil
}
// CreateTxFactory creates an SDK Factory instance used for transaction
// generation, signing and broadcasting.
func (oc OracleClient) CreateTxFactory() (tx.Factory, error) {
clientCtx, err := oc.CreateClientContext()
if err != nil {
return tx.Factory{}, err
}
txFactory := tx.Factory{}.
WithAccountRetriever(clientCtx.AccountRetriever).
WithChainID(oc.ChainID).
WithTxConfig(clientCtx.TxConfig).
WithGasAdjustment(oc.GasAdjustment).
WithGasPrices(oc.GasPrices).
WithKeybase(clientCtx.Keyring).
WithSignMode(signing.SignMode_SIGN_MODE_DIRECT).
WithSimulateAndExecute(true)
return txFactory, nil
}