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在上一课中，我们介绍了如何在 OceanOne 交易比特币。OceanOne 支持交易任何 Mixin Network 上的 token，包括所有的 ERC20 和 EOS token，不需要任何手续和费用，直接挂单即可。下面介绍如何将将一个 ERC20 token 挂上 OceanOne 交易！在掌握了 ERC20 token 之后，就可以把任何 token 在 Ocean 上买卖。

此处我们用一个叫做 Benz 的 ERC20 token 为例。这个 token 已经被充值进 Mixin Network，你可以在区块链浏览器看到这个 token 在 Mixin Network 内部的总数和交易

先将 Benz 币存入你的钱包，然后使用 getAssets API 读取它的 UUID.

调用 getAssets API 会返回 json 数据, 如:

asset_id 币的 UUID.
public_key 该币的当前钱包的地址.
symbol 币的名称. 如: Benz.

if cmd == "aw"
  assetsInfo = walletAccount.read_assets()
  p "--------The Wallet Assets List-----------------"
  assetsInfo["data"].each {|x| puts x["symbol"] + " " +
                              x["balance"] + "" + x["public_key"] +
                              x["account_name"] + "" + x["account_tag"]}
  p "----------End of Wallet Assets --------------"
end

调用 read_assets API 的完整输出如下:

"--------The Wallet Assets List-----------------"
Benz 10.03 0x822664c2EFb27E2Eb4c4286f421B4BF6FB943fC6
ETH 0 0x822664c2EFb27E2Eb4c4286f421B4BF6FB943fC6
EOS 0 eoswithmixin b0adfae2f8828d15e11cb1fbe23d6096
USDT 1 1KB4RbV5W4MNybpjcJjULKNVXubfR5MJqA
CNB 0.99999995 0x822664c2EFb27E2Eb4c4286f421B4BF6FB943fC6
BTC 0 1KB4RbV5W4MNybpjcJjULKNVXubfR5MJqA
"----------End of Wallet Assets --------------"
-------------------------------------------------------------------------

挂限价买单 低于或者等于市场价的单.
挂限价卖单 高于或者是等于市场价的单.

OceanOne 支持三种基类价格: USDT, XIN, BTC, 即: Benz/USDT, Benz/XIN, Benz/BTC, 这儿示范 Benz/USDT.

新币挂单后, 需要等一分钟左右，等 OceanOne 来初始化新币的相关数据.

if ocmd == "s3"
  p "Input the price of ERC/USDT:"
  bprice = gets.chomp
  p "Input the amount of ERC20_BENZ:"
  amount = gets.chomp
  memo = Utils.GenerateOceanMemo(USDT_ASSET_ID,"A",bprice)
  p memo
  assetsInfo = walletAccount.read_asset(ERC20_BENZ)
  if assetsInfo["data"]["balance"].to_f > 0 && assetsInfo["data"]["balance"].to_f >= amount.to_f
    transInfo = walletAccount.create_transfer(walletAccount.encrypt_pin(DEFAULT_PIN),
                                      {
                                        asset_id: ERC20_BENZ,
                                        opponent_id: OCEANONE_BOT,
                                        amount: amount,
                                        trace_id: SecureRandom.uuid,
                                        memo: memo
                                      })
    p transInfo
    p "The Order id is" + transInfo["data"]["trace_id"] + "It's needed by cancel-order!"
  else
    p "Not enough ERC20_BENZ"
  end
end

新币挂单后, 需要等一分钟左右，等 OceanOne 来初始化新币的相关数据.

if ocmd == "b3"
  p "Input the price of ERC20/USDT:"
  bprice = gets.chomp
  p "Input the amount of USDT:"
  amount = gets.chomp
  memo = Utils.GenerateOceanMemo(ERC20_BENZ,"B",bprice)
  p memo
  assetsInfo = walletAccount.read_asset(USDT_ASSET_ID)
  if assetsInfo["data"]["balance"].to_f >= 1 && assetsInfo["data"]["balance"].to_f >= amount.to_f
    transInfo = walletAccount.create_transfer(walletAccount.encrypt_pin(DEFAULT_PIN),
                                      {
                                        asset_id: USDT_ASSET_ID,
                                        opponent_id: OCEANONE_BOT,
                                        amount: amount,
                                        trace_id: SecureRandom.uuid,
                                        memo: memo
                                      })
    p transInfo
    p "The Order id is" + transInfo["data"]["trace_id"] + "It's needed by cancel-order!"
  else
    p "Not enough USDT"
  end
end

读取币的价格列表，来确认挂单是否成功!

if ocmd == "3"
  Utils.OceanOneMarketPriceRequest(ERC20_BENZ, USDT_ASSET_ID)
end
def self.OceanOneMarketPriceRequest(asset_id, base_asset_id)
   full_url = "https://events.ocean.one/markets/" + asset_id + "-" + base_asset_id + "/book"
   data = HTTP.get(full_url).body
   body = ""
   redData = data.readpartial
   while  redData != nil
     body = body + redData
     redData = data.readpartial
   end
   result = ActiveSupport::JSON.decode(body).with_indifferent_access
   result["data"]["data"]["asks"].each { |x|
                                          puts x["side"] + "" + x["price"] +" " +
                                          x["amount"] + "" + x["funds"]
                                        }
   result["data"]["data"]["bids"].each { |x|
                                          puts x["side"] + "" + x["price"] +" " +
                                          x["amount"] + "" + x["funds"]
                                        }
end

Commands list of this source code:

1: Fetch BTC/USDT Order Book
2: Fetch XIN/USDT Order Book
3: Fetch ERC20/USDT Order Book
s1: Sell BTC/USDT
b1: Buy BTC/USDT
s2: Sell XIN/USDT
b2: Buy XIN/USDT
s3: Sell ERC20/USDT
s3: Buy ERC20/USDT
c: Cancel the order
q: Exit

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

完整的代码

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用Ruby在去中心化交易所OceanOne上挂单买卖任意ERC20-token

预备知识:

取得该币的 UUID

限价挂单

限价挂卖单.

限价挂买单.

读取币的价格列表

ERC20 相关的操作指令

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