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Merge pull request #61 from Team-Kujira/dexter
Dexter
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,266 @@ | ||
| package provider | ||
|
|
||
| import ( | ||
| "context" | ||
| "encoding/json" | ||
| "fmt" | ||
| "math" | ||
| "time" | ||
|
|
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| "price-feeder/oracle/types" | ||
|
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| sdk "github.com/cosmos/cosmos-sdk/types" | ||
| "github.com/rs/zerolog" | ||
| ) | ||
|
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| var ( | ||
| _ Provider = (*DexterProvider)(nil) | ||
| dexterDefaultEndpoints = Endpoint{ | ||
| Name: ProviderDexter, | ||
| Urls: []string{}, | ||
| PollInterval: 6 * time.Second, | ||
| } | ||
| ) | ||
|
|
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| type ( | ||
| // Dexter defines an oracle provider using on chain data from persistence | ||
| // api nodes | ||
| DexterProvider struct { | ||
| provider | ||
| contracts map[string]string | ||
| denoms map[string]string | ||
| decimals map[string]int64 | ||
| } | ||
| ) | ||
|
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| func NewDexterProvider( | ||
| ctx context.Context, | ||
| logger zerolog.Logger, | ||
| endpoints Endpoint, | ||
| pairs ...types.CurrencyPair, | ||
| ) (*DexterProvider, error) { | ||
| provider := &DexterProvider{} | ||
| provider.Init( | ||
| ctx, | ||
| endpoints, | ||
| logger, | ||
| pairs, | ||
| nil, | ||
| nil, | ||
| ) | ||
|
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| provider.contracts = provider.endpoints.ContractAddresses | ||
|
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| availablePairs, _ := provider.GetAvailablePairs() | ||
| provider.setPairs(pairs, availablePairs, nil) | ||
|
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| provider.denoms = provider.getDenoms() | ||
|
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| go startPolling(provider, provider.endpoints.PollInterval, logger) | ||
| return provider, nil | ||
| } | ||
|
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| func (p *DexterProvider) Poll() error { | ||
| // {"trade": {"amount_in": "1000000", "amount_out": "499900"}} | ||
| type Response struct { | ||
| Data struct { | ||
| TradeParams struct { | ||
| AmountIn string `json:"amount_in"` | ||
| AmountOut string `json:"amount_out"` | ||
| } `json:"trade_params"` | ||
| } `json:"data"` | ||
| } | ||
|
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| timestamp := time.Now() | ||
|
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| p.mtx.Lock() | ||
| defer p.mtx.Unlock() | ||
|
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| for symbol, pair := range p.getAllPairs() { | ||
| contract, err := p.getContractAddress(pair) | ||
| if err != nil { | ||
| p.logger.Warn(). | ||
| Str("symbol", symbol). | ||
| Msg("no contract address found") | ||
| continue | ||
| } | ||
|
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| offer, found := p.denoms[pair.Base] | ||
| if !found { | ||
| continue | ||
| } | ||
|
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| ask, found := p.denoms[pair.Quote] | ||
| if !found { | ||
| continue | ||
| } | ||
|
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| decimals0, found := p.decimals[offer] | ||
| if !found { | ||
| p.logger.Error(). | ||
| Str("denom", ask). | ||
| Msg("decimals not found") | ||
| continue | ||
| } | ||
|
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| decimals1, found := p.decimals[ask] | ||
| if !found { | ||
| p.logger.Error(). | ||
| Str("denom", ask). | ||
| Msg("decimals not found") | ||
| continue | ||
| } | ||
|
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| // amount := uintToDec(10).Power(uint64(decimals0)) | ||
| amount := int64(math.Pow10(int(decimals0))) | ||
|
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| message := fmt.Sprintf(`{ | ||
| "on_swap": { | ||
| "offer_asset": { | ||
| "native_token": { | ||
| "denom": "%s" | ||
| } | ||
| }, | ||
| "ask_asset": { | ||
| "native_token": { | ||
| "denom": "%s" | ||
| } | ||
| }, | ||
| "swap_type": { | ||
| "give_in": {} | ||
| }, | ||
| "amount": "%d", | ||
| "max_spread": null, | ||
| "belief_price": "100" | ||
| } | ||
| }`, offer, ask, amount) | ||
|
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| content, err := p.wasmSmartQuery(contract, message) | ||
| if err != nil { | ||
| continue | ||
| } | ||
|
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| var response Response | ||
|
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| err = json.Unmarshal(content, &response) | ||
| if err != nil { | ||
| p.logger.Err(err) | ||
| continue | ||
| } | ||
|
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| amountIn := response.Data.TradeParams.AmountIn | ||
| amountOut := response.Data.TradeParams.AmountOut | ||
|
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| if amountIn == "" || amountIn == "0" || amountOut == "" || amountOut == "0" { | ||
| p.logger.Error().Msg("error simulating swap") | ||
| continue | ||
| } | ||
|
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| factor, err := computeDecimalsFactor(decimals0, decimals1) | ||
| if err != nil { | ||
| continue | ||
| } | ||
|
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| price := strToDec(amountOut).Quo(strToDec(amountIn)) | ||
| price = price.Mul(factor) | ||
|
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| _, found = p.pairs[pair.String()] | ||
| if !found { | ||
| price = floatToDec(1).Quo(price) | ||
| } | ||
|
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| p.setTickerPrice( | ||
| symbol, | ||
| price, | ||
| sdk.ZeroDec(), | ||
| timestamp, | ||
| ) | ||
| } | ||
|
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| return nil | ||
| } | ||
|
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| func (p *DexterProvider) GetAvailablePairs() (map[string]struct{}, error) { | ||
| return p.getAvailablePairsFromContracts() | ||
| } | ||
|
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| func (p *DexterProvider) getDenoms() map[string]string { | ||
| assets := map[string]string{} | ||
| p.decimals = map[string]int64{} | ||
|
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| // {"assets": [{"info": {"native_token": {"denom": "uxprt"}}}, {...}]} | ||
| type Response struct { | ||
| Data struct { | ||
| Assets [2]struct { | ||
| Info struct { | ||
| Token struct { | ||
| Denom string `json:"denom"` | ||
| } `json:"native_token"` | ||
| } `json:"info"` | ||
| } `json:"assets"` | ||
| } `json:"data"` | ||
| } | ||
|
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| for symbol, pair := range p.getAllPairs() { | ||
| contract, err := p.getContractAddress(pair) | ||
| if err != nil { | ||
| p.logger.Warn(). | ||
| Str("symbol", symbol). | ||
| Msg("no contract address found") | ||
| continue | ||
| } | ||
|
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| content, err := p.wasmSmartQuery(contract, `{"config":{}}`) | ||
| if err != nil { | ||
| continue | ||
| } | ||
|
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| var response Response | ||
|
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| err = json.Unmarshal(content, &response) | ||
| if err != nil { | ||
| p.logger.Err(err) | ||
| continue | ||
| } | ||
|
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| _, found := p.pairs[pair.String()] | ||
| if !found { | ||
| pair = pair.Swap() | ||
| } | ||
|
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| symbols := []string{ | ||
| pair.Base, | ||
| pair.Quote, | ||
| } | ||
|
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| for i := 0; i < 2; i++ { | ||
| denom := response.Data.Assets[i].Info.Token.Denom | ||
| symbol := symbols[i] | ||
| assets[symbol] = denom | ||
|
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| decimals, err := p.getDecimals(contract, denom) | ||
| if err != nil { | ||
| continue | ||
| } | ||
| p.decimals[denom] = decimals | ||
| } | ||
| } | ||
|
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| return assets | ||
| } | ||
|
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| func (p *provider) getDecimals(contract, denom string) (int64, error) { | ||
| message := fmt.Sprintf("\nprecisions%s", denom) | ||
| content, err := p.wasmRawQuery(contract, message) | ||
| if err != nil { | ||
| return -1, err | ||
| } | ||
|
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| var decimals int64 | ||
| err = json.Unmarshal(content, &decimals) | ||
| if err != nil { | ||
| return -1, err | ||
| } | ||
|
|
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| return decimals, nil | ||
| } |
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