用Java在去中心化交易所OceanOne上掛單買賣任意ERC20 token

在上一課中，咱們介紹瞭如何在OceanOne交易比特幣。OceanOne支持交易任何Mixin Network上的token，包括全部的ERC20和EOS token，不須要任何手續和費用，直接掛單便可。下面介紹如何將將一個ERC20 token掛上OceanOne交易！

此處咱們用一個叫作Benz的ERC20 token爲例。這個token已經被充值進Mixin Network，你能夠在區塊鏈瀏覽器看到這個token在Mixin Network內部的總數和交易

預備知識:

先將Ben幣存入你的錢包，而後使用getAssets API讀取它的UUID.

取得該幣的UUID

調用 getAssets API 會返回json數據, 如:

• asset_id 幣的UUID.
• public_key 該幣的當前錢包的地址.
• symbol 幣的名稱. 如: Benz.

if ( input.equals("aw") ) {
  MixinAPI mixinApiUser = generateAPI_FromCSV();
  JsonArray assets = mixinApiUser.getAssets();
  System.out.println("------------------------All Assets Information---------------------------");
  System.out.println(assets);
  assets.forEach((element) ->  {
     JsonObject jsonObj = element.getAsJsonObject();
     System.out.println(jsonObj.get("asset_id").getAsString() + " " +
                        jsonObj.get("symbol").getAsString() + " " +
                        jsonObj.get("public_key").getAsString() + " " +
                        jsonObj.get("balance").getAsString() );
  });
  System.out.println("-----------------------------------------------------------------------");
}

調用 getAssets API的完整輸出以下:

Make your choose(eg: q for Exit!): aw
aw
------------------------All Assets Information---------------------------
[{"type":"asset","asset_id":"2b9c216c-ef60-398d-a42a-eba1b298581d","chain_id":"43d61dcd-e413-450d-80b8-101d5e903357","symbol":"Benz","name":"Benz coin","icon_url":"https://images.mixin.one/yH_I5b0GiV2zDmvrXRyr3bK5xusjfy5q7FX3lw3mM2Ryx4Dfuj6Xcw8SHNRnDKm7ZVE3_LvpKlLdcLrlFQUBhds=s128",
"balance":"1000","public_key":"0x62F20013472a72b8Fe3f9a99f36e5802E6e93c15","account_name":"",
"account_tag":"","price_btc":"0","price_usd":"0","change_btc":"0","change_usd":"0",
"asset_key":"0xc409b5696c5f9612e194a582e14c8cd41ecdbc67","confirmations":100,
"capitalization":0},{"type":"asset","asset_id":"6cfe566e-4aad-470b-8c9a-2fd35b49c68d",
"chain_id":"6cfe566e-4aad-470b-8c9a-2fd35b49c68d","symbol":"EOS","name":"EOS",
"icon_url":"https://images.mixin.one/a5dtG-IAg2IO0Zm4HxqJoQjfz-5nf1HWZ0teCyOnReMd3pmB8oEdSAXWvFHt2AJkJj5YgfyceTACjGmXnI-VyRo=s128","balance":"0","public_key":"","account_name":"eoswithmixin","account_tag":"889ed66a1059bc3dab60e2ee44d0f993",
"price_btc":"0.0008953","price_usd":"4.73591781","change_btc":"-0.004161988128557199","change_usd":"0.00012182287348895748",
"asset_key":"eosio.token:EOS","confirmations":64,"capitalization":0},
{"type":"asset","asset_id":"965e5c6e-434c-3fa9-b780-c50f43cd955c","chain_id":"43d61dcd-e413-450d-80b8-101d5e903357","symbol":"CNB","name":"Chui Niu Bi",
"icon_url":"https://images.mixin.one/0sQY63dDMkWTURkJVjowWY6Le4ICjAFuu3ANVyZA4uI3UdkbuOT5fjJUT82ArNYmZvVcxDXyNjxoOv0TAYbQTNKS=s128",
"balance":"0.99984","public_key":"0x62F20013472a72b8Fe3f9a99f36e5802E6e93c15","account_name":"",
"account_tag":"","price_btc":"0","price_usd":"0","change_btc":"0","change_usd":"0",
"asset_key":"0xec2a0550a2e4da2a027b3fc06f70ba15a94a6dac","confirmations":100,
"capitalization":0},{"type":"asset","asset_id":"c6d0c728-2624-429b-8e0d-d9d19b6592fa",
"chain_id":"c6d0c728-2624-429b-8e0d-d9d19b6592fa","symbol":"BTC","name":"Bitcoin",
"icon_url":"https://images.mixin.one/HvYGJsV5TGeZ-X9Ek3FEQohQZ3fE9LBEBGcOcn4c4BNHovP4fW4YB97Dg5LcXoQ1hUjMEgjbl1DPlKg1TW7kK6XP=s128","balance":"0",
"public_key":"15RNBb5GzoXWRoEMT5MJL3pqzSjdPoXf6J","account_name":"","account_tag":"",
"price_btc":"1","price_usd":"5289.7409549","change_btc":"0","change_usd":"0.004160319338628907",
"asset_key":"c6d0c728-2624-429b-8e0d-d9d19b6592fa","confirmations":6,"capitalization":0}]
2b9c216c-ef60-398d-a42a-eba1b298581d Benz 0x62F20013472a72b8Fe3f9a99f36e5802E6e93c15 1000
6cfe566e-4aad-470b-8c9a-2fd35b49c68d EOS  0
965e5c6e-434c-3fa9-b780-c50f43cd955c CNB 0x62F20013472a72b8Fe3f9a99f36e5802E6e93c15 0.99984
c6d0c728-2624-429b-8e0d-d9d19b6592fa BTC 15RNBb5GzoXWRoEMT5MJL3pqzSjdPoXf6J 0

限價掛單

• 掛限價買單 低於或者等於市場價的單.
• 掛限價賣單 高於或者是等於市場價的單.

OceanOne支持三種基類價格: USDT, XIN, BTC, 即: Benz/USDT, Benz/XIN, Benz/BTC, 這兒示範Benz/USDT.

限價掛賣單.

新幣掛單後,須要等一分鐘左右，等OceanOne來初始化新幣的相關數據.

if ( subinput.equals("x2") ) {
  MakeTheSellOrder(ERC20_BENZ,USDT_ASSET_ID);
}
public static void MakeTheSellOrder(String AssetID, String BaseAssetID) {
  System.out.print(String.format("Please input the %s price of %s: ",AssetID,BaseAssetID));
  String pinput = System.console().readLine();
  System.out.println(pinput);

  System.out.print(String.format("Please input the %s amount: ",AssetID));
  String aminput = System.console().readLine();
  System.out.println(aminput);
  float amountf = Float.valueOf(aminput.trim()).floatValue();

  String OrderMemo = GenerateOrderMemo("A",BaseAssetID,pinput);
  MixinAPI mixinApiUser = generateAPI_FromCSV();
  // UUID usdtUUID         =  UUID.fromString(USDT_ASSET_ID);
  // String memoTarget     = encodeUUID(usdtUUID);
  System.out.println("------------------Ocean.one-EXCHANGE----------------------------");
  System.out.println(OrderMemo);
  JsonObject asset = mixinApiUser.getAsset(AssetID);
  System.out.println(asset);
  System.out.println(asset.get("balance").getAsFloat());
  if ( asset.get("balance").getAsFloat()  > 0 && asset.get("balance").getAsFloat() >= amountf ) {
      JsonObject transInfo = mixinApiUser.transfer(AssetID, OCEANONE_BOT,
                                                   aminput,
                                                   OrderMemo);
      System.out.println(String.format("--------------%s Transfer To EXCHANGE Information---------",AssetID));
      System.out.println(transInfo);
      System.out.println(String.format("---Order is %s: ------",transInfo.get("trace_id").getAsString()));
   } else System.out.println(String.format("----------------Not enough %s--------------------------",AssetID));
}

限價掛買單.

新幣掛單後,須要等一分鐘左右，等OceanOne來初始化新幣的相關數據.

if ( subinput.equals("x1") ) {
  MakeTheBuyOrder(ERC20_BENZ,USDT_ASSET_ID);
}
public static void MakeTheBuyOrder(String AssetID, String BaseAssetID) {
  System.out.print(String.format("Please input the %s price of %s: ",AssetID,BaseAssetID));
  String pinput = System.console().readLine();
  System.out.println(pinput);

  System.out.print(String.format("Please input the %s amount: ",BaseAssetID));
  String aminput = System.console().readLine();
  System.out.println(aminput);
  float amountf = Float.valueOf(aminput.trim()).floatValue();

  String OrderMemo = GenerateOrderMemo("B",AssetID,pinput);
  MixinAPI mixinApiUser = generateAPI_FromCSV();
  // UUID usdtUUID         =  UUID.fromString(USDT_ASSET_ID);
  // String memoTarget     = encodeUUID(usdtUUID);
  System.out.println("------------------Ocean.one--EXCHANGE----------------------------");
  System.out.println(OrderMemo);
  JsonObject asset = mixinApiUser.getAsset(BaseAssetID);
  System.out.println(asset);
  System.out.println(asset.get("balance").getAsFloat());
  if ( asset.get("balance").getAsFloat()  > 0 && asset.get("balance").getAsFloat() >= amountf ) {
      JsonObject transInfo = mixinApiUser.transfer(BaseAssetID, OCEANONE_BOT,
                                                   aminput,
                                                   OrderMemo);
       System.out.println(String.format("--------------%s Transfer To EXCHANGE Information---------",BaseAssetID));
       System.out.println(transInfo);
       System.out.println(String.format("---Order is %s: ------",transInfo.get("trace_id").getAsString()));
    } else System.out.println(String.format("----------------Not enough %s--------------------------",BaseAssetID));
}

讀取幣的價格列表

讀取幣的價格列表，來確認掛單是否成功!

if ( subinput.equals("x") ) {
  FetchOceanMarketInfos(ERC20_BENZ,XIN_ASSET_ID);
}
private static void FetchOceanMarketInfos(String targetAssetID, String baseAssetID) {
  OkHttpClient client = new OkHttpClient();
  String baseUrl = "https://events.ocean.one/markets/%s-%s/book ";
  String fullUrl = String.format(baseUrl,targetAssetID,baseAssetID);
  // String fullUrl = baseUrl + url;
  System.out.println(fullUrl);
  Request request = new Request.Builder()
                             .url(fullUrl)
                             .build();
  try {
     Response response = client.newCall(request).execute();
     if (!response.isSuccessful()) {
       throw new IOException("Unexpected code " + response);
     }
     String res = response.body().string();
     // System.out.println(res);
     JsonParser parser = new JsonParser();
     JsonElement jsonTree = parser.parse(res);
     JsonObject orders;
     orders =  jsonTree.getAsJsonObject();
     JsonArray asksOrders = orders.get("data").getAsJsonObject().
                                   get("data").getAsJsonObject().
                                   get("asks").getAsJsonArray();
     JsonArray bidsOrders = orders.get("data").getAsJsonObject().
                                   get("data").getAsJsonObject().
                                   get("bids").getAsJsonArray();
     // System.out.println(orders.get("data").getAsJsonObject().get("data").getAsJsonObject().get("bids").getAsJsonArray());
     System.out.println("--Side--Price--Amount--Funds---");
     asksOrders.forEach((element) ->  {
        JsonObject jsonObj = element.getAsJsonObject();
        System.out.println(jsonObj.get("side").getAsString() + " " +
                           jsonObj.get("price").getAsString() + " " +
                           jsonObj.get("amount").getAsString() + " " +
                           jsonObj.get("funds").getAsString() );
     });
     bidsOrders.forEach((element) ->  {
        JsonObject jsonObj = element.getAsJsonObject();
        System.out.println(jsonObj.get("side").getAsString() + " " +
                           jsonObj.get("price").getAsString() + " " +
                           jsonObj.get("amount").getAsString() + " " +
                           jsonObj.get("funds").getAsString() );
     });
     System.out.println("----endo--of--btc/usdt----");
     return;
   } catch(Exception e) { e.printStackTrace(); }
   return;
}

ERC20相關的操做指令

Commands list of this source code:

• trb:Transfer ERC20 from Bot to Wallet
• trm:Transfer ERC20 from Wallet to Master
• o: Ocean.One Exchange

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

• x: Orders-Book of ERC20/USDT
• x1: Buy ERC20 pay USDT
• x2: Sell ERC20 get USDT
• c: Cancel the order
• q: Exit

完整的代碼