├── .gitignore ├── go.mod ├── bot ├── state.go ├── account_info.go ├── crypto_price.go ├── bot.go ├── config.go ├── buy.go └── sell.go ├── main.go ├── README.md ├── go.sum ├── money ├── bimoney_test.go └── bimoney.go └── LICENSE /.gitignore: -------------------------------------------------------------------------------- 1 | .idea 2 | .vscode 3 | config.json 4 | bnc-trading-bot 5 | -------------------------------------------------------------------------------- /go.mod: -------------------------------------------------------------------------------- 1 | module github.com/MatejLach/bnc-trading-bot 2 | 3 | go 1.16 4 | 5 | require ( 6 | github.com/adshao/go-binance/v2 v2.2.1 7 | github.com/hashicorp/go-retryablehttp v0.6.8 8 | github.com/mattn/go-sqlite3 v1.14.6 9 | github.com/rs/zerolog v1.20.0 10 | golang.org/x/sync v0.0.0-20190423024810-112230192c58 11 | ) 12 | -------------------------------------------------------------------------------- /bot/state.go: -------------------------------------------------------------------------------- 1 | package bot 2 | 3 | import "database/sql" 4 | 5 | // TODO 6 | func initDb(db *sql.DB) error { 7 | stmt, err := db.Prepare(` 8 | 9 | CREATE TABLE IF NOT EXISTS trading_bot( 10 | crypto TEXT PRIMARY KEY, currency TEXT NOT NULL, 11 | original_price REAL NOT NULL, original_price_timestamp TEXT NOT NULL, 12 | current_price REAL NOT NULL, current_price_timestamp TEXT NOT NULL)`) 13 | 14 | if err != nil { 15 | return err 16 | } 17 | 18 | _, err = stmt.Exec() 19 | if err != nil { 20 | return err 21 | } 22 | 23 | return nil 24 | } 25 | -------------------------------------------------------------------------------- /bot/account_info.go: -------------------------------------------------------------------------------- 1 | package bot 2 | 3 | import ( 4 | "context" 5 | "strings" 6 | 7 | "github.com/adshao/go-binance/v2" 8 | 9 | "github.com/MatejLach/bnc-trading-bot/money" 10 | ) 11 | 12 | func (b *Bot) GetAccountBalance(holdingSymbol string) (money.Bimoney, error) { 13 | _, err := b.binanceClient.NewSetServerTimeService().Do(context.Background(), binance.WithRecvWindow(0)) 14 | if err != nil { 15 | return 0, err 16 | } 17 | 18 | res, err := b.binanceClient.NewGetAccountService().Do(context.Background()) 19 | if err != nil { 20 | return 0, err 21 | } 22 | 23 | if len(res.Balances) == 0 { 24 | return 0, nil 25 | } 26 | 27 | for _, balance := range res.Balances { 28 | if strings.ToUpper(holdingSymbol) == strings.ToUpper(balance.Asset) { 29 | return money.ParseBimoney(balance.Free) 30 | } 31 | } 32 | 33 | return 0, nil 34 | } 35 | -------------------------------------------------------------------------------- /bot/crypto_price.go: -------------------------------------------------------------------------------- 1 | package bot 2 | 3 | import ( 4 | "time" 5 | 6 | "github.com/adshao/go-binance/v2" 7 | ) 8 | 9 | func (b *Bot) GetCurrentCryptoPrice(symbol string) (<-chan string, chan<- struct{}, error) { 10 | currentPriceC := make(chan string) 11 | stopC := make(chan struct{}) 12 | var done bool 13 | var wsErr error 14 | 15 | eventHandler := func(event *binance.WsMarketStatEvent) { 16 | if !done { 17 | currentPriceC <- event.LastPrice 18 | } 19 | } 20 | 21 | errHandler := func(err error) { 22 | wsErr = err 23 | } 24 | 25 | doneC, stopWsC, err := binance.WsMarketStatServe(symbol, eventHandler, errHandler) 26 | if wsErr != nil { 27 | return nil, nil, wsErr 28 | } 29 | 30 | if err != nil { 31 | return nil, nil, err 32 | } 33 | 34 | go func() { 35 | defer close(currentPriceC) 36 | 37 | for { 38 | select { 39 | case <-doneC: 40 | time.Sleep(5 * time.Second) 41 | done = true 42 | return 43 | case <-stopC: 44 | stopWsC <- struct{}{} 45 | time.Sleep(5 * time.Second) 46 | done = true 47 | return 48 | } 49 | } 50 | }() 51 | 52 | return currentPriceC, stopC, nil 53 | } 54 | -------------------------------------------------------------------------------- /bot/bot.go: -------------------------------------------------------------------------------- 1 | package bot 2 | 3 | import ( 4 | "context" 5 | "database/sql" 6 | "errors" 7 | "log" 8 | "net/http" 9 | "os" 10 | "syscall" 11 | "time" 12 | 13 | "github.com/adshao/go-binance/v2" 14 | "github.com/hashicorp/go-retryablehttp" 15 | _ "github.com/mattn/go-sqlite3" 16 | ) 17 | 18 | var ( 19 | InsufficientFunds = errors.New("account has insufficient balance for requested action") 20 | ) 21 | 22 | type Bot struct { 23 | binanceClient *binance.Client 24 | db *sql.DB 25 | Config Config 26 | } 27 | 28 | func New() *Bot { 29 | if !configExists() { 30 | initConfig() 31 | os.Exit(0) 32 | } 33 | 34 | config, err := parseConfig() 35 | if err != nil { 36 | log.Fatal(err) 37 | } 38 | 39 | binance.WebsocketKeepalive = true 40 | 41 | client := binance.NewClient(config.APIKey, config.APISecret) 42 | 43 | httpClient := retryablehttp.NewClient() 44 | httpClient.Logger = nil // disable default DEBUG logs 45 | 46 | httpClient.CheckRetry = func(ctx context.Context, resp *http.Response, err error) (bool, error) { 47 | if errors.Is(err, syscall.ECONNRESET) { 48 | return true, err 49 | } 50 | return retryablehttp.DefaultRetryPolicy(ctx, resp, err) 51 | } 52 | httpClient.RetryWaitMin = 30 * time.Second 53 | httpClient.RetryWaitMax = 2 * time.Minute 54 | 55 | client.HTTPClient = httpClient.StandardClient() 56 | 57 | // TODO: Add on-disk state keeping 58 | sqliteDb, err := sql.Open("sqlite3", "./state.sqlite") 59 | if err != nil { 60 | log.Fatal(err) 61 | } 62 | //err =initDb(sqliteDb) 63 | //if err != nil { 64 | // log.Fatalln(err) 65 | //} 66 | 67 | return &Bot{binanceClient: client, db: sqliteDb, Config: config} 68 | } 69 | -------------------------------------------------------------------------------- /main.go: -------------------------------------------------------------------------------- 1 | package main 2 | 3 | import ( 4 | "fmt" 5 | "sync" 6 | "time" 7 | 8 | "github.com/rs/zerolog" 9 | "github.com/rs/zerolog/log" 10 | 11 | "github.com/MatejLach/bnc-trading-bot/bot" 12 | ) 13 | 14 | func init() { 15 | zerolog.TimeFieldFormat = time.RFC3339 16 | 17 | zerolog.SetGlobalLevel(zerolog.DebugLevel) 18 | } 19 | 20 | func main() { 21 | botClient := bot.New() 22 | wg := sync.WaitGroup{} 23 | 24 | for _, cfg := range botClient.Config.Sell { 25 | symbolPriceC, closeC, err := botClient.GetCurrentCryptoPrice(fmt.Sprintf("%s%s", cfg.SellHoldingSymbol, cfg.SellForSymbol)) 26 | if err != nil { 27 | log.Warn().Err(err).Msgf("failed getting initial price of %s, skipping...", cfg.SellHoldingSymbol) 28 | continue 29 | } 30 | 31 | wg.Add(1) 32 | 33 | go func(sellCfg bot.SellConfig) { 34 | defer wg.Done() 35 | 36 | err := botClient.SellIfIncreaseByPercent(symbolPriceC, closeC, sellCfg) 37 | if err != nil { 38 | symbol := fmt.Sprintf("%s%s", sellCfg.SellHoldingSymbol, sellCfg.SellForSymbol) 39 | log.Warn().Err(err).Msgf("failed executing sell order for '%s', skipping...", symbol) 40 | } 41 | 42 | }(cfg) 43 | } 44 | 45 | for _, cfg := range botClient.Config.Buy { 46 | symbolPriceC, closeC, err := botClient.GetCurrentCryptoPrice(fmt.Sprintf("%s%s", cfg.BuySymbol, cfg.BuyWithHoldingSymbol)) 47 | if err != nil { 48 | log.Warn().Err(err).Msgf("failed getting initial price of %s, skipping...", cfg.BuySymbol) 49 | continue 50 | } 51 | 52 | wg.Add(1) 53 | 54 | go func(buyCfg bot.BuyConfig) { 55 | defer wg.Done() 56 | 57 | err := botClient.BuyIfDecreaseByPercent(symbolPriceC, closeC, buyCfg) 58 | if err != nil { 59 | symbol := fmt.Sprintf("%s%s", buyCfg.BuySymbol, buyCfg.BuyWithHoldingSymbol) 60 | log.Warn().Err(err).Msgf("failed executing purchase order for '%s', skipping...", symbol) 61 | } 62 | 63 | }(cfg) 64 | } 65 | 66 | wg.Wait() 67 | } 68 | -------------------------------------------------------------------------------- /bot/config.go: -------------------------------------------------------------------------------- 1 | package bot 2 | 3 | import ( 4 | "encoding/json" 5 | "fmt" 6 | "log" 7 | "math" 8 | "os" 9 | ) 10 | 11 | type Config struct { 12 | APIKey string `json:"api_key"` 13 | APISecret string `json:"api_secret"` 14 | Sell []SellConfig `json:"Sell"` 15 | Buy []BuyConfig `json:"Buy"` 16 | } 17 | 18 | type SellConfig struct { 19 | SellHoldingSymbol string `json:"sell_holding_symbol"` 20 | SellForSymbol string `json:"sell_for_symbol"` 21 | TargetPriceToSellAt string `json:"target_price_to_sell_at"` 22 | PercentageDiff uint `json:"percentage_diff"` 23 | SellPercentOfHoldings uint `json:"sell_percent_of_holdings"` 24 | SellQuantityOfHoldings string `json:"sell_quantity"` 25 | } 26 | 27 | type BuyConfig struct { 28 | BuySymbol string `json:"buy_symbol"` 29 | BuyWithHoldingSymbol string `json:"buy_with_holding_symbol"` 30 | TargetPriceToBuyAt string `json:"target_price_to_buy_at"` 31 | PercentageDiff int `json:"percentage_diff"` 32 | BuyForPercentOfHoldings uint `json:"buy_for_percent_of_holdings"` 33 | BuyQuantity string `json:"buy_quantity"` 34 | } 35 | 36 | func initConfig() { 37 | log.Println("No config.json found, attempting to create a new config...") 38 | config := Config{ 39 | Sell: []SellConfig{ 40 | { 41 | SellHoldingSymbol: "", 42 | SellForSymbol: "", 43 | PercentageDiff: 0, 44 | SellPercentOfHoldings: 0, 45 | SellQuantityOfHoldings: "", 46 | }, 47 | }, 48 | Buy: []BuyConfig{ 49 | { 50 | BuySymbol: "", 51 | BuyWithHoldingSymbol: "", 52 | PercentageDiff: 0, 53 | BuyForPercentOfHoldings: 0, 54 | BuyQuantity: "", 55 | }, 56 | }, 57 | } 58 | 59 | jsonBytes, err := json.MarshalIndent(config, "", " ") 60 | if err != nil { 61 | log.Fatal(err) 62 | } 63 | 64 | err = os.WriteFile("config.json", jsonBytes, 0777) 65 | if err != nil { 66 | log.Fatal(err) 67 | } 68 | 69 | log.Println("New config.json created, come back once you're filled it with your desired parameters.") 70 | } 71 | 72 | func parseConfig() (Config, error) { 73 | cfgData, err := os.ReadFile("config.json") 74 | if err != nil { 75 | return Config{}, err 76 | } 77 | 78 | var config Config 79 | 80 | err = json.Unmarshal(cfgData, &config) 81 | if err != nil { 82 | return Config{}, err 83 | } 84 | 85 | if config.APIKey == "" || config.APISecret == "" { 86 | return Config{}, fmt.Errorf("you need to provide Binance API key and API secret in the config to be able to use this bot") 87 | } 88 | 89 | if len(config.Sell) == 0 && len(config.Buy) == 0 { 90 | return Config{}, fmt.Errorf("you need to fill in at least one 'Sell' or 'Buy' section of the config to be able to use this bot") 91 | } 92 | 93 | for _, buyCfg := range config.Buy { 94 | if buyCfg.PercentageDiff != 0 && !math.Signbit(float64(buyCfg.PercentageDiff)) { 95 | return Config{}, fmt.Errorf("buy config: asset price percentage decrease for %s needs to be negative (-%d) to be considered valid", buyCfg.BuySymbol, buyCfg.PercentageDiff) 96 | } 97 | } 98 | 99 | return config, nil 100 | } 101 | 102 | func configExists() bool { 103 | if _, err := os.Stat("config.json"); os.IsNotExist(err) { 104 | return false 105 | } 106 | 107 | return true 108 | } 109 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | bnc-trading-bot 2 | = 3 | 4 | 5 | [![License: GPL v3](https://img.shields.io/badge/GPLv3-Free%20as%20in%20freedom-blue)](LICENSE) 6 | 7 | > [Download the latest release for your OS](https://github.com/MatejLach/bnc-trading-bot/releases/tag/v0.1.1) 8 | 9 | This bot automatically trades crypto / fiat assets on [Binance.com](https://www.binance.com/en) according to simple, configurable rules. 10 | It allows you to buy crypto assets when they go down in value by a configurable percentage/at an exact price & sell when they're up, automatically. 11 | 12 | Building from source 13 | - 14 | Assuming a correctly set up [Go toolchain](https://golang.org/doc/install), simply run: 15 | 16 | `$ go build` 17 | 18 | from within the cloned source directory. 19 | 20 | Running 21 | - 22 | Navigate with your shell to the directory where the compiled binary is located and execute with: 23 | 24 | `$ ./bnc-trading-bot` 25 | 26 | Configuration 27 | - 28 | 29 | Upon first launch, a new `config.json` configuration file will be created that looks something like the following, (excluding the explanatory comments): 30 | 31 | ```javascript 32 | { 33 | "api_key": "", // replace everything between " " with your personal Binance.com API key 34 | "api_secret": "", // replace everything between " " with your personal Binance.com API secret 35 | "Sell": [ 36 | { 37 | "sell_holding_symbol": "BNB", // i.e. "BNB" as in 'I have BNB holdings' 38 | "sell_for_symbol": "GBP", // that I want to sell for 'GBP' 39 | "target_price_to_sell_at": "524.00", // sell when "BNB" price against "GBP" reaches an exact amount, set 'percentage_diff' to 0 for this to take effect (has to be higher than the current price) 40 | "percentage_diff": 55, // OR when 'BNB' is up 55% against 'GBP' from when I started this program (has to be positive) 41 | "sell_percent_of_holdings": 25, // sell 25% of my total BNB wallet balance, set to 0 in order for the 'sell_quantity' setting to take effect 42 | "sell_quantity": "0.45" // OR sell exactly 0.45 BNB when it's up 55%, 'sell_percent_of_holdings' takes precedence if it's set to > 0 43 | } 44 | ], 45 | "Buy": [ 46 | { 47 | "buy_symbol": "BNB", // purchase 'BNB' 48 | "buy_with_holding_symbol": "GBP", // for money from my 'GBP' wallet 49 | "target_price_to_buy_at": "192", // buy when "BNB" price against "GBP" reaches an exact amount, set 'percentage_diff' to 0 for this to take effect (has to be lower than the current price) 50 | "percentage_diff": -15, // OR once 'BNB' is 15% down against 'GBP' from when I started this program (has to be negative) 51 | "buy_for_percent_of_holdings": 85, // buy as much BNB as possible for 85% of your GBP fiat wallet balance 52 | "buy_quantity": "1.12" // OR buy exactly 1.12 BNB if 'buy_for_percent_of_holdings' is set to 0, otherwise 'buy_for_percent_of_holdings' takes precedence 53 | } 54 | ] 55 | } 56 | ``` 57 | 58 | You can specify as many Buy/Sell configurations as you want by placing successive configuration objects `{...}` separated by `,` in between `[]`, see [this](https://opensource.adobe.com/Spry/samples/data_region/JSONDataSetSample.html#Example2) if you are unfamiliar with JSON arrays. 59 | 60 | The individual buy/sell configurations will run in parallel. 61 | 62 | To obtain your personal Binance API key/secret pair, consult [the relevant support article](https://www.binance.com/en/support/articles/360002502072). 63 | Make sure to **never share your config.json with anyone if it has your API details filled in**, otherwise they will be able to do trades on your behalf. 64 | 65 | Contributing 66 | - 67 | 68 | Bug reports and pull requests are welcome. Do not hesitate to open a PR / file an issue, or a feature request. 69 | 70 | Disclaimer 71 | - 72 | 73 | This program is provided 'AS IS', without any warranty or assumed liability by its creator(s). 74 | Any financial looses due its usage are solely the responsibility of its user(s). 75 | 76 | **Use at your own risk!** 77 | -------------------------------------------------------------------------------- /go.sum: -------------------------------------------------------------------------------- 1 | github.com/adshao/go-binance/v2 v2.2.1 h1:H5tfXqDu+bx1mZqJP+5gc8ahidgDFvj683M3RStg9C4= 2 | github.com/adshao/go-binance/v2 v2.2.1/go.mod h1:o+84WK3DQxq9vEKV9ncRcQi+J7RFCGhM27osbECZiJQ= 3 | github.com/bitly/go-simplejson v0.5.0 h1:6IH+V8/tVMab511d5bn4M7EwGXZf9Hj6i2xSwkNEM+Y= 4 | github.com/bitly/go-simplejson v0.5.0/go.mod h1:cXHtHw4XUPsvGaxgjIAn8PhEWG9NfngEKAMDJEczWVA= 5 | github.com/bmizerany/assert v0.0.0-20160611221934-b7ed37b82869 h1:DDGfHa7BWjL4YnC6+E63dPcxHo2sUxDIu8g3QgEJdRY= 6 | github.com/bmizerany/assert v0.0.0-20160611221934-b7ed37b82869/go.mod h1:Ekp36dRnpXw/yCqJaO+ZrUyxD+3VXMFFr56k5XYrpB4= 7 | github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4= 8 | github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= 9 | github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c= 10 | github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38= 11 | github.com/gorilla/websocket v1.2.0 h1:VJtLvh6VQym50czpZzx07z/kw9EgAxI3x1ZB8taTMQQ= 12 | github.com/gorilla/websocket v1.2.0/go.mod h1:E7qHFY5m1UJ88s3WnNqhKjPHQ0heANvMoAMk2YaljkQ= 13 | github.com/hashicorp/go-cleanhttp v0.5.1 h1:dH3aiDG9Jvb5r5+bYHsikaOUIpcM0xvgMXVoDkXMzJM= 14 | github.com/hashicorp/go-cleanhttp v0.5.1/go.mod h1:JpRdi6/HCYpAwUzNwuwqhbovhLtngrth3wmdIIUrZ80= 15 | github.com/hashicorp/go-hclog v0.9.2 h1:CG6TE5H9/JXsFWJCfoIVpKFIkFe6ysEuHirp4DxCsHI= 16 | github.com/hashicorp/go-hclog v0.9.2/go.mod h1:5CU+agLiy3J7N7QjHK5d05KxGsuXiQLrjA0H7acj2lQ= 17 | github.com/hashicorp/go-retryablehttp v0.6.8 h1:92lWxgpa+fF3FozM4B3UZtHZMJX8T5XT+TFdCxsPyWs= 18 | github.com/hashicorp/go-retryablehttp v0.6.8/go.mod h1:vAew36LZh98gCBJNLH42IQ1ER/9wtLZZ8meHqQvEYWY= 19 | github.com/kr/pretty v0.2.0 h1:s5hAObm+yFO5uHYt5dYjxi2rXrsnmRpJx4OYvIWUaQs= 20 | github.com/kr/pretty v0.2.0/go.mod h1:ipq/a2n7PKx3OHsz4KJII5eveXtPO4qwEXGdVfWzfnI= 21 | github.com/kr/pty v1.1.1/go.mod h1:pFQYn66WHrOpPYNljwOMqo10TkYh1fy3cYio2l3bCsQ= 22 | github.com/kr/text v0.1.0 h1:45sCR5RtlFHMR4UwH9sdQ5TC8v0qDQCHnXt+kaKSTVE= 23 | github.com/kr/text v0.1.0/go.mod h1:4Jbv+DJW3UT/LiOwJeYQe1efqtUx/iVham/4vfdArNI= 24 | github.com/mattn/go-sqlite3 v1.14.6 h1:dNPt6NO46WmLVt2DLNpwczCmdV5boIZ6g/tlDrlRUbg= 25 | github.com/mattn/go-sqlite3 v1.14.6/go.mod h1:NyWgC/yNuGj7Q9rpYnZvas74GogHl5/Z4A/KQRfk6bU= 26 | github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0= 27 | github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM= 28 | github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZNVY4sRDYZ/4= 29 | github.com/rs/xid v1.2.1/go.mod h1:+uKXf+4Djp6Md1KODXJxgGQPKngRmWyn10oCKFzNHOQ= 30 | github.com/rs/zerolog v1.20.0 h1:38k9hgtUBdxFwE34yS8rTHmHBa4eN16E4DJlv177LNs= 31 | github.com/rs/zerolog v1.20.0/go.mod h1:IzD0RJ65iWH0w97OQQebJEvTZYvsCUm9WVLWBQrJRjo= 32 | github.com/stretchr/objx v0.1.0 h1:4G4v2dO3VZwixGIRoQ5Lfboy6nUhCyYzaqnIAPPhYs4= 33 | github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME= 34 | github.com/stretchr/testify v1.2.1/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs= 35 | github.com/stretchr/testify v1.2.2 h1:bSDNvY7ZPG5RlJ8otE/7V6gMiyenm9RtJ7IUVIAoJ1w= 36 | github.com/stretchr/testify v1.2.2/go.mod h1:a8OnRcib4nhh0OaRAV+Yts87kKdq0PP7pXfy6kDkUVs= 37 | golang.org/x/crypto v0.0.0-20190308221718-c2843e01d9a2/go.mod h1:djNgcEr1/C05ACkg1iLfiJU5Ep61QUkGW8qpdssI0+w= 38 | golang.org/x/net v0.0.0-20190620200207-3b0461eec859/go.mod h1:z5CRVTTTmAJ677TzLLGU+0bjPO0LkuOLi4/5GtJWs/s= 39 | golang.org/x/sync v0.0.0-20190423024810-112230192c58 h1:8gQV6CLnAEikrhgkHFbMAEhagSSnXWGV915qUMm9mrU= 40 | golang.org/x/sync v0.0.0-20190423024810-112230192c58/go.mod h1:RxMgew5VJxzue5/jJTE5uejpjVlOe/izrB70Jof72aM= 41 | golang.org/x/sys v0.0.0-20190215142949-d0b11bdaac8a/go.mod h1:STP8DvDyc/dI5b8T5hshtkjS+E42TnysNCUPdjciGhY= 42 | golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ= 43 | golang.org/x/tools v0.0.0-20190828213141-aed303cbaa74/go.mod h1:b+2E5dAYhXwXZwtnZ6UAqBI28+e2cm9otk0dWdXHAEo= 44 | golang.org/x/xerrors v0.0.0-20190717185122-a985d3407aa7/go.mod h1:I/5z698sn9Ka8TeJc9MKroUUfqBBauWjQqLJ2OPfmY0= 45 | -------------------------------------------------------------------------------- /bot/buy.go: -------------------------------------------------------------------------------- 1 | package bot 2 | 3 | import ( 4 | "context" 5 | "errors" 6 | "fmt" 7 | "strconv" 8 | "strings" 9 | "time" 10 | 11 | "github.com/adshao/go-binance/v2" 12 | "github.com/rs/zerolog/log" 13 | 14 | "github.com/MatejLach/bnc-trading-bot/money" 15 | ) 16 | 17 | func (b *Bot) BuyIfDecreaseByPercent(symbolPriceChan <-chan string, symbolPriceCloseChan chan<- struct{}, buyCfg BuyConfig) error { 18 | bimOriginalPrice, err := money.ParseBimoney(<-symbolPriceChan) 19 | if err != nil { 20 | return err 21 | } 22 | 23 | configuredPercentDiff, err := money.ParseBimoney(strconv.Itoa(buyCfg.PercentageDiff)) 24 | if err != nil { 25 | return err 26 | } 27 | 28 | if buyCfg.TargetPriceToBuyAt == "" || buyCfg.TargetPriceToBuyAt == "0" { 29 | if configuredPercentDiff == 0 { 30 | return fmt.Errorf("config: either 'target_price_to_buy_at' or 'percentage_diff' have to be configured for %s%s", 31 | buyCfg.BuySymbol, buyCfg.BuyWithHoldingSymbol) 32 | } 33 | 34 | buyCfg.TargetPriceToBuyAt = (bimOriginalPrice + bimOriginalPrice.AmountFromPercentage(configuredPercentDiff)).FormatBimoney(true) 35 | } else { 36 | bimTargetToBuyAt, err := money.ParseBimoney(buyCfg.TargetPriceToBuyAt) 37 | if err != nil { 38 | return err 39 | } 40 | 41 | if bimTargetToBuyAt >= bimOriginalPrice { 42 | return fmt.Errorf("config: 'target_price_to_buy_at' for %s%s has to be lower than the current price of the symbol", buyCfg.BuySymbol, buyCfg.BuyWithHoldingSymbol) 43 | } 44 | 45 | configuredPercentDiff = bimOriginalPrice.PercentageChange(bimTargetToBuyAt) 46 | } 47 | 48 | log.Printf("Starting with the initial %s price of %s %s, with a purchase target of %s or less, (price decrease of at least %s percentage points), before buying...", 49 | buyCfg.BuySymbol, bimOriginalPrice.FormatBimoney(false), buyCfg.BuyWithHoldingSymbol, buyCfg.TargetPriceToBuyAt, configuredPercentDiff.FormatBimoney(false)) 50 | 51 | // enforce Binance server time 52 | _, err = b.binanceClient.NewSetServerTimeService().Do(context.Background()) 53 | if err != nil { 54 | return err 55 | } 56 | 57 | for { 58 | currentPrice := <-symbolPriceChan 59 | 60 | if currentPrice == "" { 61 | return fmt.Errorf("stopping execution of purchase order for %s%s, cannot get current price", buyCfg.BuySymbol, buyCfg.BuyWithHoldingSymbol) 62 | } 63 | 64 | bimCurrentPrice, err := money.ParseBimoney(currentPrice) 65 | if err != nil { 66 | return err 67 | } 68 | 69 | currentPercentDiff := bimOriginalPrice.PercentageChange(bimCurrentPrice) 70 | 71 | if currentPercentDiff <= configuredPercentDiff && bimCurrentPrice < bimOriginalPrice { 72 | log.Printf("Price decreased from %s to %s, which is a %s percent decrease!", 73 | bimOriginalPrice.FormatBimoney(false), currentPrice, currentPercentDiff.FormatBimoney(false)) 74 | 75 | cryptoQtyToBuy, err := money.ParseBimoney(buyCfg.BuyQuantity) 76 | if err != nil { 77 | cryptoQtyToBuy = 0 78 | } 79 | 80 | if buyCfg.BuyForPercentOfHoldings != 0 { 81 | bimBuyPercentOfHoldings, err := money.ParseBimoney(strconv.Itoa(int(buyCfg.BuyForPercentOfHoldings))) 82 | if err != nil { 83 | return err 84 | } 85 | 86 | balance, err := b.GetAccountBalance(buyCfg.BuyWithHoldingSymbol) 87 | if err != nil { 88 | return err 89 | } 90 | 91 | cryptoQtyToBuy = balance.AmountFromPercentage(bimBuyPercentOfHoldings).PortionOf(bimCurrentPrice) 92 | } 93 | 94 | err = b.buyCrypto(cryptoQtyToBuy, buyCfg, currentPrice) 95 | if err != nil { 96 | if errors.Is(err, InsufficientFunds) { 97 | log.Print(fmt.Errorf("%w, retrying in 1min", err).Error()) 98 | time.Sleep(1 * time.Minute) 99 | continue 100 | } 101 | return err 102 | } 103 | 104 | symbolPriceCloseChan <- struct{}{} 105 | break 106 | } 107 | } 108 | 109 | return nil 110 | } 111 | 112 | func (b *Bot) buyCrypto(cryptoQuantity money.Bimoney, buyCfg BuyConfig, currentPrice string) error { 113 | strQuantity := cryptoQuantity.FormatBimoney(true) 114 | 115 | log.Printf("Buying %s for %s...", buyCfg.BuySymbol, buyCfg.BuyWithHoldingSymbol) 116 | 117 | orderResp, err := b.binanceClient.NewCreateOrderService(). 118 | Symbol(fmt.Sprintf("%s%s", buyCfg.BuySymbol, buyCfg.BuyWithHoldingSymbol)). 119 | Side(binance.SideTypeBuy).Type(binance.OrderTypeLimit). 120 | TimeInForce(binance.TimeInForceTypeGTC).Quantity(strQuantity). 121 | Price(currentPrice).Do(context.Background()) 122 | 123 | if err != nil { 124 | if strings.Contains(strings.ToLower(err.Error()), "insufficient balance") { 125 | return InsufficientFunds 126 | } 127 | return err 128 | } 129 | 130 | if orderResp.Status == binance.OrderStatusTypeFilled && len(orderResp.Fills) > 0 { 131 | log.Printf("Purchased %s of %s for %s", orderResp.Fills[0].Quantity, buyCfg.BuySymbol, orderResp.Fills[0].Price) 132 | } 133 | 134 | return nil 135 | } 136 | -------------------------------------------------------------------------------- /bot/sell.go: -------------------------------------------------------------------------------- 1 | package bot 2 | 3 | import ( 4 | "context" 5 | "errors" 6 | "fmt" 7 | "strconv" 8 | "strings" 9 | "time" 10 | 11 | "github.com/adshao/go-binance/v2" 12 | "github.com/rs/zerolog/log" 13 | 14 | "github.com/MatejLach/bnc-trading-bot/money" 15 | ) 16 | 17 | func (b *Bot) SellIfIncreaseByPercent(symbolPriceChan <-chan string, symbolPriceCloseChan chan<- struct{}, sellCfg SellConfig) error { 18 | bimOriginalPrice, err := money.ParseBimoney(<-symbolPriceChan) 19 | if err != nil { 20 | return err 21 | } 22 | 23 | configuredPercentDiff, err := money.ParseBimoney(strconv.Itoa(int(sellCfg.PercentageDiff))) 24 | if err != nil { 25 | return err 26 | } 27 | 28 | if sellCfg.TargetPriceToSellAt == "" || sellCfg.TargetPriceToSellAt == "0" { 29 | if configuredPercentDiff == 0 { 30 | return fmt.Errorf("config: either 'target_price_to_sell_at' or 'percentage_diff' have to be configured for %s%s", 31 | sellCfg.SellHoldingSymbol, sellCfg.SellForSymbol) 32 | } 33 | 34 | sellCfg.TargetPriceToSellAt = (bimOriginalPrice + bimOriginalPrice.AmountFromPercentage(configuredPercentDiff)).FormatBimoney(true) 35 | } else { 36 | bimTargetToSellAt, err := money.ParseBimoney(sellCfg.TargetPriceToSellAt) 37 | if err != nil { 38 | return err 39 | } 40 | 41 | if bimTargetToSellAt <= bimOriginalPrice { 42 | return fmt.Errorf("config: 'target_price_to_sell_at' for %s%s has to be greater than the current price of the symbol", sellCfg.SellHoldingSymbol, sellCfg.SellForSymbol) 43 | } 44 | 45 | configuredPercentDiff = bimOriginalPrice.PercentageChange(bimTargetToSellAt) 46 | } 47 | 48 | log.Printf("Starting with the initial %s price of %s %s, with a sell target of %s or more, (price increase of at least %s percentage points), before selling...", 49 | sellCfg.SellHoldingSymbol, bimOriginalPrice.FormatBimoney(false), sellCfg.SellForSymbol, sellCfg.TargetPriceToSellAt, configuredPercentDiff.FormatBimoney(false)) 50 | 51 | // enforce Binance server time 52 | _, err = b.binanceClient.NewSetServerTimeService().Do(context.Background()) 53 | if err != nil { 54 | return err 55 | } 56 | 57 | for { 58 | currentPrice := <-symbolPriceChan 59 | 60 | if currentPrice == "" { 61 | return fmt.Errorf("stopping execution of sell order for %s%s, cannot get current price", sellCfg.SellHoldingSymbol, sellCfg.SellForSymbol) 62 | } 63 | 64 | bimCurrentPrice, err := money.ParseBimoney(currentPrice) 65 | if err != nil { 66 | return err 67 | } 68 | 69 | currentPercentDiff := bimOriginalPrice.PercentageChange(bimCurrentPrice) 70 | 71 | if currentPercentDiff >= configuredPercentDiff && bimCurrentPrice > bimOriginalPrice && bimCurrentPrice != bimOriginalPrice { 72 | log.Printf("Price increased from %s to %s, which is a %s percent increase!", 73 | bimOriginalPrice.FormatBimoney(false), currentPrice, currentPercentDiff.FormatBimoney(false)) 74 | 75 | cryptoQtyToSell, err := money.ParseBimoney(sellCfg.SellQuantityOfHoldings) 76 | if err != nil { 77 | cryptoQtyToSell = 0 78 | } 79 | 80 | if sellCfg.SellPercentOfHoldings != 0 { 81 | bimSellPercentOfHoldings, err := money.ParseBimoney(strconv.Itoa(int(sellCfg.SellPercentOfHoldings))) 82 | if err != nil { 83 | return err 84 | } 85 | 86 | balance, err := b.GetAccountBalance(sellCfg.SellHoldingSymbol) 87 | if err != nil { 88 | return err 89 | } 90 | 91 | cryptoQtyToSell = balance.AmountFromPercentage(bimSellPercentOfHoldings) 92 | } 93 | 94 | err = b.sellCrypto(cryptoQtyToSell, sellCfg, currentPrice) 95 | if err != nil { 96 | if errors.Is(err, InsufficientFunds) { 97 | log.Print(fmt.Errorf("%w, retrying in 1min", err).Error()) 98 | time.Sleep(1 * time.Minute) 99 | continue 100 | } 101 | return err 102 | } 103 | 104 | symbolPriceCloseChan <- struct{}{} 105 | break 106 | } 107 | } 108 | 109 | return nil 110 | } 111 | 112 | func (b *Bot) sellCrypto(cryptoQuantity money.Bimoney, sellCfg SellConfig, currentPrice string) error { 113 | strQuantity := cryptoQuantity.FormatBimoney(true) 114 | 115 | log.Printf("Selling %s for %s...", sellCfg.SellHoldingSymbol, sellCfg.SellForSymbol) 116 | 117 | orderResp, err := b.binanceClient.NewCreateOrderService(). 118 | Symbol(fmt.Sprintf("%s%s", sellCfg.SellHoldingSymbol, sellCfg.SellForSymbol)). 119 | Side(binance.SideTypeSell).Type(binance.OrderTypeLimit). 120 | TimeInForce(binance.TimeInForceTypeGTC).Quantity(strQuantity). 121 | Price(currentPrice).Do(context.Background()) 122 | 123 | if err != nil { 124 | if strings.Contains(strings.ToLower(err.Error()), "insufficient balance") { 125 | return InsufficientFunds 126 | } 127 | return err 128 | } 129 | 130 | if orderResp.Status == binance.OrderStatusTypeFilled && len(orderResp.Fills) > 0 { 131 | log.Printf("Sold %s of %s for %s", orderResp.Fills[0].Quantity, sellCfg.SellHoldingSymbol, orderResp.Fills[0].Price) 132 | } 133 | 134 | return nil 135 | } 136 | -------------------------------------------------------------------------------- /money/bimoney_test.go: -------------------------------------------------------------------------------- 1 | package money 2 | 3 | import ( 4 | "strconv" 5 | "testing" 6 | ) 7 | 8 | func TestBimoney_PercentageChange(t *testing.T) { 9 | tests := map[string]struct { 10 | inputMoneyStrOriginal string 11 | inputMoneyStrNew string 12 | expected Bimoney 13 | expectedFmt string 14 | }{ 15 | "112.5 => 52%": { 16 | inputMoneyStrOriginal: "112.5", 17 | inputMoneyStrNew: "171.00", 18 | expected: Bimoney(5200000000), 19 | expectedFmt: "52.00000000", 20 | }, 21 | "2016 => 48.8%": { 22 | inputMoneyStrOriginal: "2016", 23 | inputMoneyStrNew: "3000", 24 | expected: Bimoney(4880000000), 25 | expectedFmt: "48.80000000", 26 | }, 27 | "2016 => -35.51%": { 28 | inputMoneyStrOriginal: "2016", 29 | inputMoneyStrNew: "1300", 30 | expected: Bimoney(-3551000000), 31 | expectedFmt: "-35.51000000", 32 | }, 33 | "1 => 4900%": { 34 | inputMoneyStrOriginal: "1", 35 | inputMoneyStrNew: "50", 36 | expected: Bimoney(490000000000), 37 | expectedFmt: "4900.00000000", 38 | }, 39 | "0 => 100%": { 40 | inputMoneyStrOriginal: "0", 41 | inputMoneyStrNew: "50", 42 | expected: Bimoney(10000000000), 43 | expectedFmt: "100.00000000", 44 | }, 45 | "1.56660000 => -85.25%": { 46 | inputMoneyStrOriginal: "1.56660000", 47 | inputMoneyStrNew: "0.231000000", 48 | expected: Bimoney(-8525000000), 49 | expectedFmt: "-85.25000000", 50 | }, 51 | "0.26660000 => -13.35%": { 52 | inputMoneyStrOriginal: "0.26660000", 53 | inputMoneyStrNew: "0.231000000", 54 | expected: Bimoney(-1335000000), 55 | expectedFmt: "-13.35000000", 56 | }, 57 | } 58 | 59 | for name, tt := range tests { 60 | t.Run(name, func(t *testing.T) { 61 | inputMoneyOriginal, err := ParseBimoney(tt.inputMoneyStrOriginal) 62 | if err != nil { 63 | t.Fatal(err) 64 | } 65 | 66 | inputMoneyNew, err := ParseBimoney(tt.inputMoneyStrNew) 67 | if err != nil { 68 | t.Fatal(err) 69 | } 70 | 71 | got := inputMoneyOriginal.PercentageChange(inputMoneyNew) 72 | 73 | if tt.expected != got { 74 | t.Fatalf("expected: %d, got: %d", tt.expected, got) 75 | } 76 | 77 | if tt.expectedFmt != got.FormatBimoney(false) { 78 | t.Fatalf("expected: %s, got: %s", tt.expectedFmt, got.FormatBimoney(false)) 79 | } 80 | }) 81 | } 82 | } 83 | 84 | func TestBimoney_AmountFromPercentage(t *testing.T) { 85 | tests := map[string]struct { 86 | inputMoneyStr string 87 | inputPercentageInt int 88 | expected Bimoney 89 | expectedFmt string 90 | }{ 91 | "0.21874356 (25%)": { 92 | inputMoneyStr: "0.21874356", 93 | inputPercentageInt: 25, 94 | expected: Bimoney(5468589), 95 | expectedFmt: "0.05468589", 96 | }, 97 | "112.5 (52%)": { 98 | inputMoneyStr: "112.50", 99 | inputPercentageInt: 52, 100 | expected: Bimoney(5850000000), 101 | expectedFmt: "58.50000000", 102 | }, 103 | "215.3589 (150%)": { 104 | inputMoneyStr: "215.3589", 105 | inputPercentageInt: 150, 106 | expected: Bimoney(32303835000), 107 | expectedFmt: "323.03835000", 108 | }, 109 | } 110 | 111 | for name, tt := range tests { 112 | t.Run(name, func(t *testing.T) { 113 | inputMoney, err := ParseBimoney(tt.inputMoneyStr) 114 | if err != nil { 115 | t.Fatal(err) 116 | } 117 | 118 | inputPercentage, err := ParseBimoney(strconv.Itoa(tt.inputPercentageInt)) 119 | if err != nil { 120 | t.Fatal(err) 121 | } 122 | 123 | got := inputMoney.AmountFromPercentage(inputPercentage) 124 | 125 | if tt.expected != got { 126 | t.Fatalf("expected: %d, got: %d", tt.expected, got) 127 | } 128 | 129 | if tt.expectedFmt != got.FormatBimoney(false) { 130 | t.Fatalf("expected: %s, got: %s", tt.expectedFmt, got.FormatBimoney(false)) 131 | } 132 | }) 133 | } 134 | } 135 | 136 | func TestBimoney_PortionOf(t *testing.T) { 137 | tests := map[string]struct { 138 | balanceMoneyStr string 139 | currentPriceForWholeStr string 140 | expected Bimoney 141 | expectedFmt string 142 | }{ 143 | "350 as a portion of 0.1501": { 144 | balanceMoneyStr: "350", 145 | currentPriceForWholeStr: "0.15010000", 146 | expected: Bimoney(233177880000), 147 | expectedFmt: "2331.77880000", 148 | }, 149 | "150 as a portion of 500": { 150 | balanceMoneyStr: "150", 151 | currentPriceForWholeStr: "500", 152 | expected: Bimoney(30000000), 153 | expectedFmt: "0.30000000", 154 | }, 155 | } 156 | 157 | for name, tt := range tests { 158 | t.Run(name, func(t *testing.T) { 159 | balanceMoney, err := ParseBimoney(tt.balanceMoneyStr) 160 | if err != nil { 161 | t.Fatal(err) 162 | } 163 | 164 | currentPriceForWhole, err := ParseBimoney(tt.currentPriceForWholeStr) 165 | if err != nil { 166 | t.Fatal(err) 167 | } 168 | 169 | got := balanceMoney.PortionOf(currentPriceForWhole) 170 | 171 | if tt.expected != got { 172 | t.Fatalf("expected: %d, got: %d", tt.expected, got) 173 | } 174 | 175 | if tt.expectedFmt != got.FormatBimoney(false) { 176 | t.Fatalf("expected: %s, got: %s", tt.expectedFmt, got.FormatBimoney(false)) 177 | } 178 | }) 179 | } 180 | } 181 | -------------------------------------------------------------------------------- /money/bimoney.go: -------------------------------------------------------------------------------- 1 | package money 2 | 3 | import ( 4 | "fmt" 5 | "strconv" 6 | "strings" 7 | ) 8 | 9 | // Bimoney is an integer representation of money on Binance with up to 8 levels of scale/precision. 10 | type Bimoney int64 11 | 12 | func (m Bimoney) PercentageChange(newVal Bimoney) Bimoney { 13 | if m == 0 { 14 | return Bimoney(10000000000) 15 | } 16 | 17 | if strings.HasPrefix(((newVal - m) * 100000000).FormatBimoney(false), "-") { 18 | diff := newVal - m 19 | if diff == 0 { 20 | return Bimoney(0) 21 | } 22 | 23 | interim := m / 10000 24 | if interim == 0 { 25 | return Bimoney(0) 26 | } 27 | 28 | return (diff / interim) * 1000000 29 | } else { 30 | diff := (newVal - m) * 100000000 31 | if diff == 0 { 32 | return Bimoney(0) 33 | } 34 | 35 | interim := diff / m 36 | return interim * 100 37 | } 38 | } 39 | 40 | func (m Bimoney) AmountFromPercentage(percentage Bimoney) Bimoney { 41 | if percentage == 0 { 42 | return Bimoney(0) 43 | } 44 | 45 | interim := m * (percentage / 100000000) 46 | if interim == 0 { 47 | return Bimoney(0) 48 | } 49 | 50 | return interim / 100 51 | } 52 | 53 | func (m Bimoney) PortionOf(value Bimoney) Bimoney { 54 | if m == 0 || value == 0 { 55 | return Bimoney(0) 56 | } 57 | 58 | return m / (value / 10000) * 10000 59 | } 60 | 61 | // ParseBimoney converts a string representation of an integer or a float to Bimoney. 62 | // Only dots '.' are considered valid decimal place delimiters, commas ',' are not accepted. 63 | func ParseBimoney(strAmont string) (Bimoney, error) { 64 | if _, err := strconv.ParseFloat(strAmont, 64); err != nil { 65 | return 0, fmt.Errorf("cannot convert input string to Bimoney; %w", err) 66 | } 67 | 68 | if strings.Contains(strAmont, ",") { 69 | return 0, fmt.Errorf("cannot convert input string containing ',' to Bimoney") 70 | } 71 | 72 | if !strings.Contains(strAmont, ".") { 73 | parsedAmount, err := strconv.ParseInt(strAmont, 10, 64) 74 | if err != nil { 75 | return 0, fmt.Errorf("cannot convert input string to Bimoney; %w", err) 76 | } 77 | return Bimoney(parsedAmount * 100000000), nil 78 | } 79 | 80 | pointSplit := strings.Split(strAmont, ".") 81 | 82 | if len(pointSplit) != 2 { 83 | return 0, fmt.Errorf("cannot convert input string containing multiple '.' to Bimoney") 84 | } 85 | 86 | if strings.HasSuffix(pointSplit[1], "0") { 87 | for strings.HasSuffix(pointSplit[1], "0") { 88 | pointSplit[1] = strings.TrimSuffix(pointSplit[1], "0") 89 | } 90 | 91 | if pointSplit[1] == "" { 92 | strAmont = pointSplit[0] 93 | } else { 94 | strAmont = strings.Join(pointSplit, ".") 95 | } 96 | } 97 | 98 | if !strings.Contains(strAmont, ".") { 99 | return ParseBimoney(strAmont) 100 | } 101 | 102 | // prevent removing leading zeros when parsing to int 103 | var discountLeadingPrefix bool 104 | if strings.HasPrefix(pointSplit[1], "0") { 105 | pointSplit[1] = fmt.Sprintf("1%s", pointSplit[1]) 106 | discountLeadingPrefix = true 107 | } 108 | 109 | afterPointInt, err := strconv.ParseInt(pointSplit[1], 10, 64) 110 | if err != nil { 111 | return 0, fmt.Errorf("cannot convert input string to Bimoney; %w", err) 112 | } 113 | 114 | // count the number of digits after the decimal point 115 | digitCounter := 0 116 | afterPointIntCounter := afterPointInt 117 | for afterPointIntCounter != 0 { 118 | afterPointIntCounter /= 10 119 | digitCounter++ 120 | } 121 | 122 | if discountLeadingPrefix { 123 | digitCounter -= 1 124 | } 125 | 126 | if digitCounter == 8 { 127 | microInt, err := strconv.ParseInt(strings.Replace(strAmont, ".", "", 1), 10, 64) 128 | if err != nil { 129 | return 0, fmt.Errorf("cannot convert input string to Bimoney; %w", err) 130 | } 131 | 132 | return Bimoney(microInt), nil 133 | } 134 | 135 | if digitCounter > 8 { 136 | return 0, fmt.Errorf("cannot convert input string to Bimoney, max 8 places of precision are supported, input requires %d", digitCounter) 137 | } else { 138 | for 8-digitCounter != 0 { 139 | strAmont += "0" 140 | digitCounter++ 141 | } 142 | } 143 | 144 | microInt, err := strconv.ParseInt(strings.Replace(strAmont, ".", "", 1), 10, 64) 145 | if err != nil { 146 | return 0, fmt.Errorf("cannot convert input string to Bimoney; %w", err) 147 | } 148 | 149 | return Bimoney(microInt), nil 150 | } 151 | 152 | func (b Bimoney) FormatBimoney(fitToLot bool) string { 153 | bimoneyStr := strconv.FormatInt(int64(b), 10) 154 | 155 | var negative bool 156 | if strings.HasPrefix(bimoneyStr, "-") { 157 | bimoneyStr = strings.TrimPrefix(bimoneyStr, "-") 158 | negative = true 159 | } 160 | 161 | if len(bimoneyStr) < 8 { 162 | for len(bimoneyStr) < 8 { 163 | bimoneyStr = fmt.Sprintf("0%s", bimoneyStr) 164 | } 165 | bimoneyStr = fmt.Sprintf("0%s", bimoneyStr) 166 | } else if len(bimoneyStr) == 8 { 167 | bimoneyStr = fmt.Sprintf("0%s", bimoneyStr) 168 | } 169 | 170 | bimoneyFmt := fmt.Sprintf("%s.%s", bimoneyStr[:len(bimoneyStr)-8], bimoneyStr[len(bimoneyStr)-8:]) 171 | 172 | if fitToLot { 173 | pointSplit := strings.Split(bimoneyFmt, ".") 174 | roundDirectionN, err := strconv.Atoi(string(pointSplit[1][1])) 175 | if err != nil { 176 | return bimoneyFmt 177 | } 178 | 179 | if roundDirectionN >= 5 { 180 | roundN, err := strconv.Atoi(string(pointSplit[1][0])) 181 | if err != nil { 182 | return bimoneyFmt 183 | } 184 | 185 | roundN++ 186 | 187 | bimoneyFmt = fmt.Sprintf("%s.%s", pointSplit[0], fmt.Sprintf("%s%d00000", pointSplit[1][:0], roundN)) 188 | } else if roundDirectionN <= 4 { 189 | roundN, err := strconv.Atoi(string(pointSplit[1][0])) 190 | if err != nil { 191 | return bimoneyFmt 192 | } 193 | 194 | bimoneyFmt = fmt.Sprintf("%s.%s", pointSplit[0], fmt.Sprintf("%s%d00000", pointSplit[1][:0], roundN)) 195 | } 196 | } 197 | 198 | if negative { 199 | bimoneyFmt = fmt.Sprintf("-%s", bimoneyFmt) 200 | } 201 | 202 | return bimoneyFmt 203 | } 204 | -------------------------------------------------------------------------------- /LICENSE: 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No Surrender of Others' Freedom. 541 | 542 | If conditions are imposed on you (whether by court order, agreement or 543 | otherwise) that contradict the conditions of this License, they do not 544 | excuse you from the conditions of this License. If you cannot convey a 545 | covered work so as to satisfy simultaneously your obligations under this 546 | License and any other pertinent obligations, then as a consequence you may 547 | not convey it at all. For example, if you agree to terms that obligate you 548 | to collect a royalty for further conveying from those to whom you convey 549 | the Program, the only way you could satisfy both those terms and this 550 | License would be to refrain entirely from conveying the Program. 551 | 552 | 13. Use with the GNU Affero General Public License. 553 | 554 | Notwithstanding any other provision of this License, you have 555 | permission to link or combine any covered work with a work licensed 556 | under version 3 of the GNU Affero General Public License into a single 557 | combined work, and to convey the resulting work. The terms of this 558 | License will continue to apply to the part which is the covered work, 559 | but the special requirements of the GNU Affero General Public License, 560 | section 13, concerning interaction through a network will apply to the 561 | combination as such. 562 | 563 | 14. Revised Versions of this License. 564 | 565 | The Free Software Foundation may publish revised and/or new versions of 566 | the GNU General Public License from time to time. Such new versions will 567 | be similar in spirit to the present version, but may differ in detail to 568 | address new problems or concerns. 569 | 570 | Each version is given a distinguishing version number. If the 571 | Program specifies that a certain numbered version of the GNU General 572 | Public License "or any later version" applies to it, you have the 573 | option of following the terms and conditions either of that numbered 574 | version or of any later version published by the Free Software 575 | Foundation. If the Program does not specify a version number of the 576 | GNU General Public License, you may choose any version ever published 577 | by the Free Software Foundation. 578 | 579 | If the Program specifies that a proxy can decide which future 580 | versions of the GNU General Public License can be used, that proxy's 581 | public statement of acceptance of a version permanently authorizes you 582 | to choose that version for the Program. 583 | 584 | Later license versions may give you additional or different 585 | permissions. However, no additional obligations are imposed on any 586 | author or copyright holder as a result of your choosing to follow a 587 | later version. 588 | 589 | 15. Disclaimer of Warranty. 590 | 591 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 592 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 593 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 594 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 595 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 596 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 597 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 598 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 599 | 600 | 16. Limitation of Liability. 601 | 602 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 603 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 604 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 605 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 606 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 607 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 608 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 609 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 610 | SUCH DAMAGES. 611 | 612 | 17. Interpretation of Sections 15 and 16. 613 | 614 | If the disclaimer of warranty and limitation of liability provided 615 | above cannot be given local legal effect according to their terms, 616 | reviewing courts shall apply local law that most closely approximates 617 | an absolute waiver of all civil liability in connection with the 618 | Program, unless a warranty or assumption of liability accompanies a 619 | copy of the Program in return for a fee. 620 | 621 | END OF TERMS AND CONDITIONS 622 | 623 | How to Apply These Terms to Your New Programs 624 | 625 | If you develop a new program, and you want it to be of the greatest 626 | possible use to the public, the best way to achieve this is to make it 627 | free software which everyone can redistribute and change under these terms. 628 | 629 | To do so, attach the following notices to the program. It is safest 630 | to attach them to the start of each source file to most effectively 631 | state the exclusion of warranty; and each file should have at least 632 | the "copyright" line and a pointer to where the full notice is found. 633 | 634 | 635 | Copyright (C) 636 | 637 | This program is free software: you can redistribute it and/or modify 638 | it under the terms of the GNU General Public License as published by 639 | the Free Software Foundation, either version 3 of the License, or 640 | (at your option) any later version. 641 | 642 | This program is distributed in the hope that it will be useful, 643 | but WITHOUT ANY WARRANTY; without even the implied warranty of 644 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 645 | GNU General Public License for more details. 646 | 647 | You should have received a copy of the GNU General Public License 648 | along with this program. If not, see . 649 | 650 | Also add information on how to contact you by electronic and paper mail. 651 | 652 | If the program does terminal interaction, make it output a short 653 | notice like this when it starts in an interactive mode: 654 | 655 | Copyright (C) 656 | This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'. 657 | This is free software, and you are welcome to redistribute it 658 | under certain conditions; type `show c' for details. 659 | 660 | The hypothetical commands `show w' and `show c' should show the appropriate 661 | parts of the General Public License. Of course, your program's commands 662 | might be different; for a GUI interface, you would use an "about box". 663 | 664 | You should also get your employer (if you work as a programmer) or school, 665 | if any, to sign a "copyright disclaimer" for the program, if necessary. 666 | For more information on this, and how to apply and follow the GNU GPL, see 667 | . 668 | 669 | The GNU General Public License does not permit incorporating your program 670 | into proprietary programs. If your program is a subroutine library, you 671 | may consider it more useful to permit linking proprietary applications with 672 | the library. If this is what you want to do, use the GNU Lesser General 673 | Public License instead of this License. But first, please read 674 | . 675 | --------------------------------------------------------------------------------