Buy and sell bitcoin on oceanone through go

Time:2019-11-7

Buy and sell bitcoin on oceanone through go

The previous chapter introduced exincore, where you can buy and sell assets at market price in one second. You need oceanone if you want to limit price trading, or buy and sell assets that are not supported by exincore.

Scheme II: ocean.one exchange

Ocean.one is a decentralized exchange based on mixin network, with first-class performance.
You can trade any asset on oceanone. Just transfer your currency to oceanone and write the transaction information in the memo of the transaction. Oceanone will list your transaction needs in the market,
After the transaction is successful, the target currency will be transferred to your mixin network account, which has three major features and advantages:

  • No need to register with oceanone
  • No need to deposit money to the exchange
  • Support all assets that can be transferred on mixin network and all erc20 EOS tokens.

Preparatory knowledge:

You need to create a robot first, method in tutorial 1

Install dependency package

Lesson four, it was installed in the last lesson

Charge it to mixin network and read out its balance

Here is a demonstration of buying BTC with usdt or buying usdt with BTC. Check your wallet address before you trade.
The complete steps are as follows:

  • Check the balance and wallet address of bitcoin or usdt. And write down the address of the wallet.
  • From a third-party exchange or your cold wallet, charge the money to the wallet address above.
  • Check the balance of the currency again to see whether the account is good or not. (bitcoin’s arrival time is the height of five blocks, about 100 minutes).

Bitcoin and usdt have the same recharge address.

userInfo, userID := ReadAssetInfo("USDT")
fmt.Println("User ID ",userID, "'s USDT Address is: ",
           userInfo["data"].(map[string]interface{})["public_key"])
fmt.Println("Balance is: ",
           userInfo["data"].(map[string]interface{})["balance"])

func ReadAssetInfo(asset_id string) ( map[string]interface{}, string) {
 var UserInfoMap map[string]interface{}
 csvFile, err := os.Open("mybitcoin_wallet.csv")
 if err != nil {
   log.Fatal(err)
 }
 reader := csv.NewReader(bufio.NewReader(csvFile))
 record, err := reader.Read()
 if err != nil {
   log.Fatal(err)
 }
 fmt.Println(record[3])
 PrivateKey2           := record[0]
 SessionID2                := record[2]
 UserID2               := record[3]
 UserInfoBytes, err    := mixin.ReadAsset(mixin.GetAssetId(asset_id),
                                        UserID2,SessionID2,PrivateKey2)
 if err != nil {
         log.Fatal(err)
 }
 fmt.Println(string(UserInfoBytes))
 if err := json.Unmarshal(UserInfoBytes, &UserInfoMap); err != nil {
     panic(err)
 }
 csvFile.Close()
 return UserInfoMap, UserID2
}

Obtain market price information of ocean.one

How to query the price information of ocean.one market? You should first understand what the base currency you are trading is. If you want to buy bitcoin and sell usdt, the base currency is usdt; if you want to buy usdt and sell bitcoin, the base currency is bitcoin

if cmd == "1" {
   FormatOceanOneMarketPrice(mixin.GetAssetId("XIN"),mixin.GetAssetId("USDT"))
 }
func FormatOceanOneMarketPrice(asset_id string, base_asset string) {
  priceInfo, err := GetOceanOneMarketPrice(asset_id, base_asset)
  if err != nil {
    log.Fatal(err)
  }

  var marketInfo map[string]interface{}
  err = json.Unmarshal([]byte(priceInfo), &marketInfo)
   fmt.Println("Price | Amount | Funds | Side")
  for _, v := range (marketInfo["data"].
                    (map[string]interface{})["data"].
                    (map[string]interface{})["asks"].
                    ([]interface{})) {
    fmt.Println(v.(map[string]interface{})["price"],
                v.(map[string]interface{})["amount"],
                v.(map[string]interface{})["funds"],
                v.(map[string]interface{})["side"],
               )
  }
  for _, v := range (marketInfo["data"].
                    (map[string]interface{})["data"].
                    (map[string]interface{})["bids"].
                    ([]interface{})) {
    fmt.Println(v.(map[string]interface{})["price"],
                v.(map[string]interface{})["amount"],
                v.(map[string]interface{})["funds"],
                v.(map[string]interface{})["side"],
               )
  }
}
func GetOceanOneMarketPrice(asset_id string, base_asset string) ([]byte, error)  {
    var body []byte
    req, err := http.NewRequest("GET", "https://events.ocean.one/markets/" + asset_id + "-" + base_asset + "/book",
                              bytes.NewReader(body))
    if err != nil {
        return nil, err
    }
    req.Header.Set("Content-Type", "application/json")

    resp, err := httpClient.Do(req)
    if err != nil {
        return nil, err
    }
    defer resp.Body.Close()
  // fmt.Println(resp.Body)
    bt, err := ioutil.ReadAll(resp.Body)
    if resp.StatusCode != http.StatusOK {
        var resp struct {
            Error Error `json:"error"`
        }
        err = json.Unmarshal(bt, &resp)
        if err == nil {
            err = resp.Error
        }
    }
    return bt, err
}

Create a memo before trading!

In the second chapter, go bitcoin development tutorial based on mixin network: robots accept bitcoin and return it to users immediately. We have learned how to transfer accounts. Here we introduce how to tell ocean.one what we want to transfer accounts for and put all information in memo

  • SideDirection, “B” or “a”, “B” is purchase, and “a” is sale
  • AssetUUIDUUID of the target virtual asset
  • PricePrice: if the operation direction is “B”, the price is the price of assetuuid; if the operation direction is “B”, the price is the price transferred to ocean.one
func generateOceanOrderMemo(TargetAsset, Side, Price string) (string) {
  packUuid, _ := uuid.FromString(TargetAsset)
  memoOcean,_ :=
    msgpack.Marshal(OceanOrderAction{
      T: "L",
      P: Price,
      S: Side,
      A: packUuid,
    })
  return  base64.StdEncoding.EncodeToString(memoOcean)
}

Example of Xin sold

To be soldXINGive ocean. One (ocean? BOT) and put the UUID of the target virtual asset you plan to exchange back into memo

if cmd == "s1" {
  fmt.Print("Please input the price of XIN/USDT: ")
  var pcmd string
  var acmd string
  scanner.Scan()
  pcmd = scanner.Text()
  fmt.Println(pcmd)
  fmt.Print("Please input the amount of XIN: ")
  scanner.Scan()
  acmd = scanner.Text()
  fmt.Println(acmd)
  omemo := generateOceanOrderMemo(mixin.GetAssetId("USDT"),"A",pcmd)
  priKey, pToken, sID, userID, uPIN := GetWalletInfo()
  balance := ReadAssetBalance("XIN",userID,sID,priKey)
  fmt.Println(balance)
  fbalance, _ := strconv.ParseFloat(balance,64)
  abalance, _ := strconv.ParseFloat(acmd,64)
  if fbalance > 0 && fbalance >= abalance {
    fmt.Println(omemo)
    transInfo, _ := mixin.Transfer(OCEANONE_BOT,
                                   acmd,
                                   mixin.GetAssetId("XIN"),
                                   omemo,
                                   messenger.UuidNewV4().String(),
                                   uPIN,pToken,userID,sID,priKey)
    fmt.Println(string(transInfo))
    var jsTransInfo map[string]interface{}
    err := json.Unmarshal([]byte(transInfo), &jsTransInfo)
    if err != nil {
        log.Fatal(err)
    }
    fmt.Println("The Order id is " + jsTransInfo["data"].(map[string]interface{})["trace_id"].(string) +
               " it is needed to cancel the order!")
  } else { fmt.Println("Not enough XIN!") }
}

If you are going to buy Xin, do the following:

if cmd == "b1" {
  fmt.Print("Please input the price of XIN/USDT: ")
  var pcmd string
  var acmd string
  scanner.Scan()
  pcmd = scanner.Text()
  fmt.Println(pcmd)
  fmt.Print("Please input the amount of USDT: ")
  scanner.Scan()
  acmd = scanner.Text()
  fmt.Println(acmd)
  omemo := generateOceanOrderMemo(mixin.GetAssetId("XIN"),"B",pcmd)
  priKey, pToken, sID, userID, uPIN := GetWalletInfo()
  balance := ReadAssetBalance("USDT",userID,sID,priKey)
  fmt.Println(balance)
  fbalance, _ := strconv.ParseFloat(balance,64)
  abalance, _ := strconv.ParseFloat(acmd,64)
  if fbalance > 0 && fbalance >= abalance {
    fmt.Println(omemo)
    transInfo, _ := mixin.Transfer(OCEANONE_BOT,
                                   acmd,
                                   mixin.GetAssetId("USDT"),
                                   omemo,
                                   messenger.UuidNewV4().String(),
                                   uPIN,pToken,userID,sID,priKey)
    fmt.Println(string(transInfo))
    var jsTransInfo map[string]interface{}
    err := json.Unmarshal([]byte(transInfo), &jsTransInfo)
    if err != nil {
        log.Fatal(err)
    }
    fmt.Println("The Order id is " + jsTransInfo["data"].(map[string]interface{})["trace_id"].(string) +
               " it is needed to cancel the order!")
  } else { fmt.Println("Not enough USDT!") }
}//end of b1

A successful list is as follows:

Please input the price of BTC/USDT: 5666
5666
Please input the amount of USDT: 1
1
1
hKFToUKhQcQQxtDHKCYkQpuODdnRm2WS+qFQpDU2NjahVKFM
{"data":{"type":"transfer","snapshot_id":"c1518f2c-c2e8-4d2d-b7c3-a42770f2bdab",
"opponent_id":"aaff5bef-42fb-4c9f-90e0-29f69176b7d4",
"asset_id":"815b0b1a-2764-3736-8faa-42d694fa620a","amount":"-1",
"trace_id":"26ef0ec1-a60c-4702-b8ca-4bd40330e120",
"memo":"hKFToUKhQcQQxtDHKCYkQpuODdnRm2WS+qFQpDU2NjahVKFM",
"created_at":"2019-05-08T06:48:42.919216755Z",
"counter_user_id":"aaff5bef-42fb-4c9f-90e0-29f69176b7d4"}}
The Order id is 26ef0ec1-a60c-4702-b8ca-4bd40330e120 it is needed to cancel the order!

Cancel the list

Ocean.one uses trace Ou ID as an order, such as the above example,26ef0ec1-a60c-4702-b8ca-4bd40330e120It’s the order number. We use him to cancel the order.

if cmd == "c" {
  fmt.Print("Please input the Order id: ")
  var ocmd string
  scanner.Scan()
  ocmd = scanner.Text()
  fmt.Println(ocmd)
  orderid, _ := uuid.FromString(ocmd)
  memoOcean,_ :=
    msgpack.Marshal(OceanOrderCancel{
      O: orderid,
    })
  omemoCancel := base64.StdEncoding.EncodeToString(memoOcean)
  priKey, pToken, sID, userID, uPIN := GetWalletInfo()
  balance := ReadAssetBalance("CNB",userID,sID,priKey)
  fmt.Println(balance)
  fbalance, _ := strconv.ParseFloat(balance,64)
  // abalance, _ := strconv.ParseFloat(acmd,64)
  if fbalance > 0 && fbalance >= 0.0000001 {
    fmt.Println(omemoCancel)
    transInfo, _ := mixin.Transfer(OCEANONE_BOT,
                                   "0.00000001",
                                   mixin.GetAssetId("CNB"),
                                   omemoCancel,
                                   messenger.UuidNewV4().String(),
                                   uPIN,pToken,userID,sID,priKey)
    fmt.Println(string(transInfo))
  } else { fmt.Println("Not enough CNB!") }
}

Confirm receipt by reading asset balance

if cmd == "aw" {
  priKey, _, sID, userID, _ := GetWalletInfo()
  assets, err := mixin.ReadAssets(userID,sID,priKey)
  if err != nil {
      log.Fatal(err)
  }
  var AssetsInfo map[string]interface{}
  err = json.Unmarshal(assets, &AssetsInfo)
  if err != nil {
      log.Fatal(err)
  }
  // fmt.Println("Data is: ",AssetsInfo["data"].(map[string]interface{})["public_key"])
  for _, v := range (AssetsInfo["data"].([]interface{})) {
    if v.(map[string]interface{})["symbol"] == "EOS" {
      fmt.Println(v.(map[string]interface{})["symbol"]," ",
                  v.(map[string]interface{})["account_name"]," ",
                  v.(map[string]interface{})["account_tag"]," ",
                  v.(map[string]interface{})["balance"])
    } else {
      fmt.Println(v.(map[string]interface{})["symbol"]," ",
                  v.(map[string]interface{})["public_key"]," ",
                  v.(map[string]interface{})["balance"])
    }
  }
}

Source code execution

Compile and execute to start the transaction

  • go run coin_exchange.goCompile the project

Command list when this code is executed:

Commands list of this source code:

  • aw: Read Wallet Assets
  • o: Ocean.One Exchange
  • q: Exit

Make your choose:

Make your choose(eg: q for Exit!):

  • 1: Fetch XIN/USDT orders
  • s1: Sell XIN/USDT
  • b1: Buy XIN/USDT
  • 2: Fetch ERC20(Benz)/USDT orders
  • s2: Sell Benz/USDT
  • b2: Buy Benz/USDT
  • 3: Fetch BTC/USDT orders
  • s3: Sell BTC/USDT
  • b3: Buy BTC/USDT
  • c: Cancel Order
  • q: Exit

Complete code

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