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tx.go
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tx.go
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package oracle
import (
"crypto/rand"
"encoding/hex"
"fmt"
"github.com/spf13/viper"
"github.com/cosmos/cosmos-sdk/client/utils"
sdk "github.com/cosmos/cosmos-sdk/types"
"github.com/terra-project/core/x/oracle"
"github.com/everett-protocol/terra-oracle/types"
)
func (os *OracleService) makePrevoteMsgs(denoms []string) ([]sdk.Msg, error) {
feeder := os.cliCtx.GetFromAddress()
validator, err := sdk.ValAddressFromBech32(viper.GetString(FlagValidator))
if err != nil {
return nil, fmt.Errorf("invalid validator: %s", err.Error())
}
prevoteMsgs := make([]sdk.Msg, 0)
for _, denom := range denoms {
pairStr := types.PairStr(types.LUNA, denom)
price := os.lunaPrices[pairStr]
if price.IsZero() {
return nil, fmt.Errorf("price %s is not set", pairStr)
}
salt, err := generateRandomString(4)
if err != nil {
return nil, fmt.Errorf("fail to generate salt: %s", err.Error())
}
os.salts[pairStr] = salt
voteHash, err := oracle.VoteHash(salt, price, "u"+denom, validator)
if err != nil {
return nil, fmt.Errorf("fail to vote hash: %s", err.Error())
}
prevote := oracle.NewMsgPricePrevote(hex.EncodeToString(voteHash), "u"+denom, feeder, validator)
prevoteMsgs = append(prevoteMsgs, prevote)
os.preLunaPrices[pairStr] = os.lunaPrices[pairStr]
}
return prevoteMsgs, nil
}
func (os *OracleService) makeVoteMsgs(denoms []string) ([]sdk.Msg, error) {
feeder := os.cliCtx.GetFromAddress()
validator, err := sdk.ValAddressFromBech32(viper.GetString(FlagValidator))
if err != nil {
return nil, fmt.Errorf("invalid validator: %s", err.Error())
}
voteMsgs := make([]sdk.Msg, 0)
for _, denom := range denoms {
pairStr := types.PairStr(types.LUNA, denom)
price := os.preLunaPrices[pairStr]
if price.IsZero() {
return nil, fmt.Errorf("price %s is not set", pairStr)
}
salt := os.salts[pairStr]
if len(salt) == 0 {
// It can occur before the first prevote was sent
// So, this error may be temporary
return nil, fmt.Errorf("fail to get salt")
}
vote := oracle.NewMsgPriceVote(price, salt, "u"+denom, feeder, validator)
voteMsgs = append(voteMsgs, vote)
}
for _, denom := range denoms {
pairStr := types.PairStr(types.LUNA, denom)
price := os.lunaPrices[pairStr]
if price.IsZero() {
return nil, fmt.Errorf("price %s is not set", pairStr)
}
salt, err := generateRandomString(4)
if err != nil {
return nil, fmt.Errorf("fail to generate salt: %s", err.Error())
}
os.salts[pairStr] = salt
voteHash, err := oracle.VoteHash(salt, price, "u"+denom, validator)
if err != nil {
return nil, fmt.Errorf("fail to vote hash: %s", err.Error())
}
prevote := oracle.NewMsgPricePrevote(hex.EncodeToString(voteHash), "u"+denom, feeder, validator)
voteMsgs = append(voteMsgs, prevote)
os.preLunaPrices[pairStr] = os.lunaPrices[pairStr]
}
return voteMsgs, nil
}
func (os *OracleService) broadcast(msgs []sdk.Msg) (*sdk.TxResponse, error) {
txBldr, err := utils.PrepareTxBuilder(os.txBldr, os.cliCtx)
if err != nil {
return nil, err
}
fromName := os.cliCtx.GetFromName()
// build and sign the transaction
txBytes, err := txBldr.BuildAndSign(fromName, os.passphrase, msgs)
if err != nil {
return nil, err
}
// broadcast to a Tendermint node
res, err := os.cliCtx.BroadcastTx(txBytes)
if err != nil {
return nil, err
}
return &res, os.cliCtx.PrintOutput(res)
}
// GenerateRandomBytes returns securely generated random bytes.
// It will return an error if the system's secure random
// number generator fails to function correctly, in which
// case the caller should not continue.
func generateRandomBytes(n int) ([]byte, error) {
b := make([]byte, n)
_, err := rand.Read(b)
// Note that err == nil only if we read len(b) bytes.
if err != nil {
return nil, err
}
return b, nil
}
// GenerateRandomString returns a securely generated random string.
// It will return an error if the system's secure random
// number generator fails to function correctly, in which
// case the caller should not continue.
func generateRandomString(n int) (string, error) {
const letters = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
bytes, err := generateRandomBytes(n)
if err != nil {
return "", err
}
for i, b := range bytes {
bytes[i] = letters[b%byte(len(letters))]
}
return string(bytes), nil
}