make it so

2019-06-19 16:43:46 -07:00 · 2019-06-19 16:43:46 -07:00 · ad20260328
commit ad20260328
10 changed files with 854 additions and 0 deletions
--- a/HdSigner.go
+++ b/HdSigner.go
@ -0,0 +1,42 @@
+package oracle
+
+import (
+	"github.com/cosmos/cosmos-sdk/crypto/keys/hd"
+	cosmos_types "github.com/cosmos/cosmos-sdk/types"
+	"github.com/cosmos/go-bip39"
+	"github.com/tendermint/tendermint/crypto"
+	"github.com/tendermint/tendermint/crypto/secp256k1"
+)
+
+type HdSigner struct {
+	privKey secp256k1.PrivKeySecp256k1
+	address cosmos_types.AccAddress
+}
+
+func NewHdSignerFromMneumonic(mneumonic string) (*HdSigner, error) {
+	seed, err := bip39.NewSeedWithErrorChecking(mneumonic, "")
+	if err != nil {
+		return nil, err
+	}
+	masterPriv, ch := hd.ComputeMastersFromSeed(seed)
+	params := hd.NewFundraiserParams(0, 0)
+	derivedPriv, err := hd.DerivePrivateKeyForPath(masterPriv, ch, params.String())
+	privKey := secp256k1.PrivKeySecp256k1(derivedPriv)
+
+	return &HdSigner{
+		privKey: privKey,
+		address: cosmos_types.AccAddress(privKey.PubKey().Address()),
+	}, nil
+}
+
+func (signer *HdSigner) Address() cosmos_types.AccAddress {
+	return signer.address
+}
+
+func (signer *HdSigner) PubKey() crypto.PubKey {
+	return signer.privKey.PubKey()
+}
+
+func (signer *HdSigner) Sign(bytes []byte) ([]byte, error) {
+	return signer.privKey.Sign(bytes)
+}
--- a/LICENSE.md
+++ b/LICENSE.md
@ -0,0 +1,55 @@
+# Blue Oak Model License
+
+Version 1.0.0
+
+## Purpose
+
+This license gives everyone as much permission to work with
+this software as possible, while protecting contributors
+from liability.
+
+## Acceptance
+
+In order to receive this license, you must agree to its
+rules.  The rules of this license are both obligations
+under that agreement and conditions to your license.
+You must not do anything with this software that triggers
+a rule that you cannot or will not follow.
+
+## Copyright
+
+Each contributor licenses you to do everything with this
+software that would otherwise infringe that contributor's
+copyright in it.
+
+## Notices
+
+You must ensure that everyone who gets a copy of
+any part of this software from you, with or without
+changes, also gets the text of this license or a link to
+<https://blueoakcouncil.org/license/1.0.0>.
+
+## Excuse
+
+If anyone notifies you in writing that you have not
+complied with [Notices](#notices), you can keep your
+license by taking all practical steps to comply within 30
+days after the notice.  If you do not do so, your license
+ends immediately.
+
+## Patent
+
+Each contributor licenses you to do everything with this
+software that would otherwise infringe any patent claims
+they can license or become able to license.
+
+## Reliability
+
+No contributor can revoke this license.
+
+## No Liability
+
+***As far as the law allows, this software comes as is,
+without any warranty or condition, and no contributor
+will be liable to anyone for any damages related to this
+software or this license, under any kind of legal claim.***
--- a/PriceOracle.go
+++ b/PriceOracle.go
@ -0,0 +1,284 @@
+package oracle
+
+import (
+	"context"
+	"fmt"
+	"log"
+	"time"
+
+	cosmos_types "github.com/cosmos/cosmos-sdk/types"
+	"github.com/cosmos/cosmos-sdk/x/auth"
+	context3 "github.com/cosmos/cosmos-sdk/x/auth/client/txbuilder"
+	"github.com/google/uuid"
+	"github.com/tendermint/go-amino"
+	"github.com/tendermint/tendermint/rpc/client"
+	"github.com/tendermint/tendermint/types"
+	"github.com/terra-project/core/app"
+	"github.com/terra-project/core/x/oracle"
+	"github.com/terra-project/core/x/oracle/client/cli"
+)
+
+type PriceOracleConfig struct {
+	Client        *client.HTTP
+	ValAddress    cosmos_types.ValAddress
+	ChainID       string
+	TxFee         cosmos_types.Coin
+	PriceProvider PriceProvider
+	Signer        Signer
+}
+
+type PriceOracle struct {
+	cdc        *amino.Codec
+	client     *client.HTTP
+	valAddress cosmos_types.ValAddress
+	chainID    string
+	txFee      cosmos_types.Coin
+
+	prevotes       []Vote
+	prevotesPeriod int64
+
+	priceProvider PriceProvider
+	signer        Signer
+}
+
+func NewPriceOracle(config PriceOracleConfig) *PriceOracle { // wsClient *client.HTTP, valAddress cosmos_types.ValAddress, chainID string, priceProvider PriceProvider, signer Signer, txFee cosmos_types.Coin) *PriceOracle {
+	oracle := &PriceOracle{
+		cdc:            app.MakeCodec(),
+		client:         config.Client,
+		valAddress:     config.ValAddress,
+		chainID:        config.ChainID,
+		txFee:          config.TxFee,
+		prevotes:       []Vote{},
+		prevotesPeriod: 0,
+		priceProvider:  config.PriceProvider,
+		signer:         config.Signer,
+	}
+
+	return oracle
+}
+
+func (priceOracle *PriceOracle) ProcessingLoop() error {
+	ctx, cancel := context.WithTimeout(context.Background(), time.Second*500)
+	defer cancel()
+
+	blocks, err := priceOracle.client.Subscribe(ctx, "oracle", types.QueryForEvent(types.EventNewBlock).String())
+	if err != nil {
+		return err
+	}
+
+	params, err := priceOracle.QueryOracleParams()
+	if err != nil {
+		return err
+	}
+
+	for event := range blocks {
+		blockData := event.Data.(types.EventDataNewBlock)
+		log.Printf("New block %d", blockData.Block.Height)
+
+		blockHeight := blockData.Block.Height
+		voteCycle := blockHeight / params.VotePeriod
+
+		// if we send reveal messaage, increment offset to send prevotes as next sequence
+		var offset uint64 = 0
+
+		// first submit reveals for previous vote if we have previous vote
+		if len(priceOracle.prevotes) > 0 && priceOracle.prevotesPeriod < voteCycle {
+			revealMsgs := priceOracle.RevealVotes()
+
+			if len(revealMsgs) > 0 {
+				log.Printf("Revealing votes for period: %d\n", priceOracle.prevotesPeriod)
+				err := priceOracle.SendMessages(0, revealMsgs)
+				if err != nil {
+					log.Printf("Error sending tx: %v", err)
+				} else {
+					priceOracle.prevotes = []Vote{}
+					offset = 1
+				}
+			}
+		}
+
+		// TODO(roman) if the reveal failed, the prevotes will override existing prevotes
+		// and we won't reveal - consider changing to keep prevotes until revealed
+		// or until the period passes and there is no point in revealing
+
+		// we have already submitted a prevote for this period
+		if priceOracle.prevotesPeriod == voteCycle {
+			continue
+		}
+
+		// if we are within 4 blocks of the end of the cycle, we don't prevote
+		// this is a "workaround" for "ensuring" our prevotes are included within the proper
+		// vote period and not the next vote period
+		cycleLastHeight := (voteCycle * params.VotePeriod) + params.VotePeriod
+		if blockHeight > (cycleLastHeight - 4) {
+			continue
+		}
+
+		// generate prevotes
+		votes, prevoteMsgs := priceOracle.SubmitVotes()
+		if len(prevoteMsgs) > 0 {
+			log.Printf("Prevote for period: %d\n", voteCycle)
+			err := priceOracle.SendMessages(offset, prevoteMsgs)
+			if err != nil {
+				log.Printf("Error sending tx: %v", err)
+			} else {
+				priceOracle.prevotes = votes
+				priceOracle.prevotesPeriod = voteCycle
+			}
+		}
+	}
+
+	return nil
+}
+
+func (priceOracle *PriceOracle) RevealVotes() []cosmos_types.Msg {
+	var msgs []cosmos_types.Msg
+
+	for _, vote := range priceOracle.prevotes {
+		msg := oracle.NewMsgPriceVote(vote.Price, vote.Salt, vote.Denom, vote.Feeder, priceOracle.valAddress)
+		msgs = append(msgs, msg)
+	}
+
+	return msgs
+}
+
+func (priceOracle *PriceOracle) SubmitVotes() ([]Vote, []cosmos_types.Msg) {
+	actives, err := priceOracle.QueryActives()
+	if err != nil {
+		panic(err)
+	}
+
+	var (
+		msgs  []cosmos_types.Msg
+		votes []Vote
+	)
+	for _, denom := range actives {
+		// truncate leading `u` from the denom for price lookup
+		truncatedDenom := denom[1:]
+
+		price, err := priceOracle.priceProvider.GetPrice(truncatedDenom)
+		if err != nil {
+			log.Printf("Could not get %s price; err=%v", denom, err)
+			continue
+		}
+
+		vote := Vote{
+			Feeder:    priceOracle.signer.Address(),
+			Denom:     denom,
+			Salt:      uuid.New().String()[:3],
+			Price:     price,
+			Validator: priceOracle.valAddress,
+		}
+
+		log.Printf("Voting for %s with price %s", denom, price.String())
+
+		msg := oracle.NewMsgPricePrevote(vote.Hash(), vote.Denom, vote.Feeder, vote.Validator)
+		msgs = append(msgs, msg)
+		votes = append(votes, vote)
+	}
+
+	return votes, msgs
+}
+
+func (priceOracle *PriceOracle) SendMessages(sequenceOffset uint64, msgs []cosmos_types.Msg) error {
+	tx := auth.StdTx{}
+	tx.Msgs = msgs
+
+	acc, err := priceOracle.QueryAccount(priceOracle.signer.Address())
+	if err != nil {
+		return err
+	}
+
+	fee := auth.NewStdFee(50000, cosmos_types.Coins{priceOracle.txFee})
+	tx.Fee = fee
+
+	signMsg := context3.StdSignMsg{
+		ChainID:       priceOracle.chainID,
+		AccountNumber: acc.GetAccountNumber(),
+		Sequence:      acc.GetSequence() + sequenceOffset,
+		Memo:          "",
+		Msgs:          msgs,
+		Fee:           fee,
+	}
+	signBytes := signMsg.Bytes()
+
+	signature, err := priceOracle.signer.Sign(signBytes)
+	if err != nil {
+		return err
+	}
+
+	tx.Signatures = []auth.StdSignature{
+		{
+			Signature: signature,
+			PubKey:    priceOracle.signer.PubKey(),
+		},
+	}
+
+	txBytes, err := auth.DefaultTxEncoder(priceOracle.cdc)(tx)
+	if err != nil {
+		return err
+	}
+
+	res, err := priceOracle.client.BroadcastTxSync(txBytes)
+	if err != nil {
+		return err
+	}
+
+	if res.Code != 0 {
+		return fmt.Errorf("Error sending tx: %v", res)
+	}
+
+	log.Printf("Submitted tx: %v\n", res)
+
+	return nil
+}
+
+func (priceOracle *PriceOracle) QueryAccount(addr cosmos_types.AccAddress) (auth.Account, error) {
+	bz, err := priceOracle.cdc.MarshalJSON(auth.NewQueryAccountParams(addr))
+	if err != nil {
+		return nil, err
+	}
+
+	res, err := priceOracle.client.ABCIQuery(fmt.Sprintf("custom/%s/%s", auth.StoreKey, auth.QueryAccount), bz)
+	if err != nil {
+		return nil, err
+	}
+
+	var account auth.Account
+	err = priceOracle.cdc.UnmarshalJSON(res.Response.Value, &account)
+	if err != nil {
+		return nil, err
+	}
+
+	return account, nil
+}
+
+func (priceOracle *PriceOracle) QueryActives() (cli.DenomList, error) {
+	res, err := priceOracle.client.ABCIQuery(fmt.Sprintf("custom/%s/%s", "oracle", oracle.QueryActive), nil)
+	if err != nil {
+		return nil, err
+	}
+
+	var actives cli.DenomList
+	err = priceOracle.cdc.UnmarshalJSON(res.Response.Value, &actives)
+	if err != nil {
+		return nil, err
+	}
+
+	return actives, nil
+}
+
+func (priceOracle *PriceOracle) QueryOracleParams() (*oracle.Params, error) {
+	res, err := priceOracle.client.ABCIQuery(fmt.Sprintf("custom/%s/%s", "oracle", oracle.QueryParams), nil)
+	if err != nil {
+		return nil, err
+	}
+
+	var params oracle.Params
+	err = priceOracle.cdc.UnmarshalJSON(res.Response.Value, &params)
+	if err != nil {
+		return nil, err
+	}
+
+	return &params, nil
+}
--- a/README.md
+++ b/README.md
@ -0,0 +1,16 @@
+# Terra Oracle
+
+A library for implementing a price oracle on the Terra network.
+
+## Example
+
+See example directory for an example oracle program.
+
+## Sponsors
+
+* [Certus One](https://certus.one/)
+* [Polychain Labs](https://polychainlabs.com/)
+
+## License
+
+[Blue Oak Model License 1.0.0](https://blueoakcouncil.org/license/1.0.0)
--- a/example/terra-oracle.go
+++ b/example/terra-oracle.go
@ -0,0 +1,71 @@
+package main
+
+import (
+	"log"
+	"os"
+
+	"github.com/cosmos/cosmos-sdk/types"
+	"github.com/tendermint/tendermint/rpc/client"
+
+	oracle "github.com/certusone/terra-oracle"
+)
+
+// examplePriceProvider implements the PriceProvider interface
+// It returns the same price for all denominations.
+type examplePriceProvider struct {
+}
+
+func NewExamplePriceProvider() (*examplePriceProvider, error) {
+	return &examplePriceProvider{}, nil
+}
+
+func (provider *examplePriceProvider) GetPrice(denom string) (types.Dec, error) {
+	return types.NewDecWithPrec(int64(10), 2), nil
+}
+
+func main() {
+	oracle.Init()
+
+	wsClient := client.NewHTTP(os.Getenv("RPC_HOST"), "/websocket")
+	err := wsClient.Start()
+	if err != nil {
+		panic(err)
+	}
+
+	chainID := os.Getenv("CHAIN_ID")
+
+	valAddressString := os.Getenv("VAL_ADDR")
+	valAddress, err := types.ValAddressFromBech32(valAddressString)
+	if err != nil {
+		panic(err)
+	}
+
+	mneumonic := os.Getenv("MNEUMONIC")
+	signer, err := oracle.NewHdSignerFromMneumonic(mneumonic)
+	if err != nil {
+		panic(err)
+	}
+
+	priceProvider, err := NewExamplePriceProvider()
+	if err != nil {
+		panic(err)
+	}
+
+	txFee := types.Coin{
+		Denom:  "ukrw",
+		Amount: types.NewInt(750),
+	}
+
+	oracle := oracle.NewPriceOracle(oracle.PriceOracleConfig{
+		Client:        wsClient,
+		ValAddress:    valAddress,
+		ChainID:       chainID,
+		PriceProvider: priceProvider,
+		Signer:        signer,
+		TxFee:         txFee,
+	})
+
+	log.Printf("Starting voter for:\n\tValidator: %s\n\tFeeder: %s\n\tChain: %s\n", valAddress.String(), signer.Address().String(), chainID)
+
+	oracle.ProcessingLoop()
+}
--- a/go.mod
+++ b/go.mod
@ -0,0 +1,15 @@
+module github.com/certusone/terra-oracle
+
+require (
+	github.com/cosmos/cosmos-sdk v0.34.7
+	github.com/cosmos/go-bip39 v0.0.0-20180819234021-555e2067c45d
+	github.com/google/uuid v1.1.1
+	github.com/tendermint/go-amino v0.14.1
+	github.com/tendermint/tendermint v0.31.5
+	github.com/terra-project/core v0.2.1
+)
+
+replace (
+	github.com/cosmos/cosmos-sdk => github.com/YunSuk-Yeo/cosmos-sdk v0.34.7-terra
+	golang.org/x/crypto => github.com/tendermint/crypto v0.0.0-20180820045704-3764759f34a5
+)
--- a/go.sum
+++ b/go.sum
@ -0,0 +1,317 @@
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--- a/init.go
+++ b/init.go
@ -0,0 +1,14 @@
+package oracle
+
+import (
+	"github.com/cosmos/cosmos-sdk/types"
+	"github.com/terra-project/core/types/util"
+)
+
+func Init() {
+	config := types.GetConfig()
+	config.SetBech32PrefixForAccount(util.Bech32PrefixAccAddr, util.Bech32PrefixAccPub)
+	config.SetBech32PrefixForValidator(util.Bech32PrefixValAddr, util.Bech32PrefixValPub)
+	config.SetBech32PrefixForConsensusNode(util.Bech32PrefixConsAddr, util.Bech32PrefixConsPub)
+	config.Seal()
+}
--- a/types.go
+++ b/types.go
@ -0,0 +1,16 @@
+package oracle
+
+import (
+	"github.com/tendermint/tendermint/crypto"
+	cosmos_types "github.com/cosmos/cosmos-sdk/types"
+)
+
+type PriceProvider interface {
+	GetPrice(denom string) (cosmos_types.Dec, error)
+}
+
+type Signer interface {
+	Address() cosmos_types.AccAddress
+	PubKey() crypto.PubKey
+	Sign(bytes []byte) ([]byte, error)
+}
--- a/vote.go
+++ b/vote.go
@ -0,0 +1,24 @@
+package oracle
+
+import (
+	"encoding/hex"
+	"fmt"
+
+	"github.com/cosmos/cosmos-sdk/types"
+	"github.com/tendermint/tendermint/crypto/tmhash"
+)
+
+type Vote struct {
+	Price     types.Dec
+	Salt      string
+	Denom     string
+	Feeder    types.AccAddress
+	Validator types.ValAddress
+}
+
+func (v Vote) Hash() string {
+	preimage := fmt.Sprintf("%s:%s:%s:%s", v.Salt, v.Price, v.Denom, v.Validator)
+	hash := tmhash.SumTruncated([]byte(preimage))
+
+	return hex.EncodeToString(hash[:])
+}