commit ad202603284a00ad288b3ae97ca3e0860a768475 Author: Roman Shtylman Date: Wed Jun 19 16:43:46 2019 -0700 make it so diff --git a/HdSigner.go b/HdSigner.go new file mode 100644 index 0000000..dd1aa99 --- /dev/null +++ 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) +} diff --git a/LICENSE.md b/LICENSE.md new file mode 100644 index 0000000..c5402b9 --- /dev/null +++ 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 +. + +## 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.*** diff --git a/PriceOracle.go b/PriceOracle.go new file mode 100644 index 0000000..f67db49 --- /dev/null +++ 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, ¶ms) + if err != nil { + return nil, err + } + + return ¶ms, nil +} diff --git a/README.md b/README.md new file mode 100644 index 0000000..76f2526 --- /dev/null +++ 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) \ No newline at end of file diff --git a/example/terra-oracle.go b/example/terra-oracle.go new file mode 100644 index 0000000..ab75a58 --- /dev/null +++ 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() +} diff --git a/go.mod b/go.mod new file mode 100644 index 0000000..6f56096 --- /dev/null +++ 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 +) diff --git a/go.sum b/go.sum new file mode 100644 index 0000000..5f811d5 --- /dev/null +++ b/go.sum @@ -0,0 +1,317 @@ +bou.ke/monkey v1.0.1/go.mod h1:FgHuK96Rv2Nlf+0u1OOVDpCMdsWyOFmeeketDHE7LIg= +cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw= +github.com/BurntSushi/toml v0.3.1 h1:WXkYYl6Yr3qBf1K79EBnL4mak0OimBfB0XUf9Vl28OQ= +github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU= +github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU= +github.com/OpenPeeDeeP/depguard v0.0.0-20180806142446-a69c782687b2/go.mod h1:7/4sitnI9YlQgTLLk734QlzXT8DuHVnAyztLplQjk+o= +github.com/StackExchange/wmi v0.0.0-20180116203802-5d049714c4a6/go.mod h1:3eOhrUMpNV+6aFIbp5/iudMxNCF27Vw2OZgy4xEx0Fg= +github.com/VividCortex/gohistogram v1.0.0 h1:6+hBz+qvs0JOrrNhhmR7lFxo5sINxBCGXrdtl/UvroE= +github.com/VividCortex/gohistogram v1.0.0/go.mod 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v0.0.0-20180901003855-c20040233aed/go.mod h1:Xkxe497xwlCKkIaQYRfC7CSLworTXY9RMqwhhCm+8Nc= +mvdan.cc/lint v0.0.0-20170908181259-adc824a0674b/go.mod h1:2odslEg/xrtNQqCYg2/jCoyKnw3vv5biOc3JnIcYfL4= +mvdan.cc/unparam v0.0.0-20190124213536-fbb59629db34/go.mod h1:H6SUd1XjIs+qQCyskXg5OFSrilMRUkD8ePJpHKDPaeY= +sourcegraph.com/sourcegraph/go-diff v0.5.1-0.20190210232911-dee78e514455/go.mod h1:kuch7UrkMzY0X+p9CRK03kfuPQ2zzQcaEFbx8wA8rck= +sourcegraph.com/sqs/pbtypes v0.0.0-20180604144634-d3ebe8f20ae4/go.mod h1:ketZ/q3QxT9HOBeFhu6RdvsftgpsbFHBF5Cas6cDKZ0= diff --git a/init.go b/init.go new file mode 100644 index 0000000..0c61d9c --- /dev/null +++ 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() +} \ No newline at end of file diff --git a/types.go b/types.go new file mode 100644 index 0000000..d4a6dbd --- /dev/null +++ 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) +} diff --git a/vote.go b/vote.go new file mode 100644 index 0000000..42f6c9e --- /dev/null +++ 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[:]) +}