上一章介绍了Exincore，你可以1秒完成资产的市价买卖。如果你想限定价格买卖，或者买卖一些exincore不支持的资产，你需要OceanOne。

方案二: 挂单Ocean.One交易所

Ocean.one是基于Mixin Network的去中心化交易所，它性能一流。 你可以在OceanOne上交易任何资产，只需要将你的币转给OceanOne, 将交易信息写在交易的memo里，OceanOne会在市场里列出你的交易需求， 交易成功后，会将目标币转入到你的MixinNetwork帐上，它有三大特点与优势：

• 不需要在OceanOne注册
• 不需要存币到交易所
• 支持所有Mixin Network上能够转账的资产，所有的ERC20 EOS代币。

预备知识:

你先需要创建一个机器人, 方法在 教程一.

安装依赖包

我们需要依赖 msgpack and mixin-bot ,第四章 已经做过介绍, 你应该先安装过它了.

充币到 Mixin Network, 并读出它的余额.

此处演示用 USDT购买BTC 或者 用BTC购买USDT。交易前，先检查一下钱包地址。 完整的步骤如下:

• 检查比特币或USDT的余额，钱包地址。并记下钱包地址。
• 从第三方交易所或者你的冷钱包中，将币充到上述钱包地址。
• 再检查一下币的余额，看到帐与否。(比特币的到帐时间是5个区块的高度，约100分钟)。

比特币与USDT的充值地址是一样的。

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
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取得Ocean.one的市场价格信息

如何来查询Ocean.one市场的价格信息呢？你要先了解你交易的基础币是什么，如果你想买比特币，卖出USDT,那么基础货币就是USDT;如果你想买USDT,卖出比特币，那么基础货币就是比特币.

if ocmd == "1"Utils.OceanOneMarketPriceRequest(BTC_ASSET_ID, 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).bodybody = ""redData = data.readpartialwhile  redData != nilbody = body + redDataredData = data.readpartialendresult = ActiveSupport::JSON.decode(body).with_indifferent_accessresult["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
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交易前，创建一个Memo!

在第二章里,Ruby比特币开发教程: 机器人接受比特币并立即退还用户, 我们学习过转帐，这儿我们介绍如何告诉Ocean.one，我们给它转帐的目的是什么，信息全部放在memo里.

• side 方向,"B" 或者 "A", "B"是购买, "A"是出售.
• targetAsset 目标虚拟资产的UUID.
• price 价格，如果操作方向是"B", 价格就是AssetUUID的价格; 如果操作方向是"B", 价格就是转给Ocean.one币的价格.

def self.GenerateOceanMemo(targetAsset,side,price)memo = Base64.encode64(MessagePack.pack({'A' => UUID.parse(targetAsset).to_raw,'S' => side,'P' => price,'T' => "L"}))return memo.sub("\n","")
end
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买入BTC的代码如下：

if ocmd == "b1"p "Input the price of BTC/USDT: "bprice = gets.chompp "Input the amount of USDT: "amount = gets.chompmemo = Utils.GenerateOceanMemo(BTC_ASSET_ID,"B",bprice)p memoassetsInfo = walletAccount.read_asset(USDT_ASSET_ID)if assetsInfo["data"]["balance"].to_f >= 1 && assetsInfo["data"]["balance"].to_f >= amount.to_ftransInfo = 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 transInfop "The Order id is " + transInfo["data"]["trace_id"] + " It's needed by cancel-order!"elsep "Not enough USDT"end
end
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出售BTC的例子

转打算出售的XIN给Ocean.one(OCEANONE_BOT),将你打算换回来的目标虚拟资产的UUID放入memo.

if ocmd == "s1"p "Input the price of BTC/USDT: "bprice = gets.chompp "Input the amount of BTC: "amount = gets.chompmemo = Utils.GenerateOceanMemo(USDT_ASSET_ID,"A",bprice)p memoassetsInfo = walletAccount.read_asset(BTC_ASSET_ID)if assetsInfo["data"]["balance"].to_f > 0 && assetsInfo["data"]["balance"].to_f >= amount.to_ftransInfo = walletAccount.create_transfer(walletAccount.encrypt_pin(DEFAULT_PIN),{asset_id: BTC_ASSET_ID,opponent_id: OCEANONE_BOT,amount: amount,trace_id: SecureRandom.uuid,memo: memo})p transInfop "The Order id is " + transInfo["data"]["trace_id"] + " It's needed by cancel-order!"elsep "Not enough BTC"end
end
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一个成功的挂单如下：

Make your choose(eg: q for Exit!):
b1
"Input the price of BTC/USDT: "
7777
"Input the amount of USDT: "
1
"hKFBxBDG0McoJiRCm44N2dGbZZL6oVOhQqFQpDc3NzehVKFM"
{"data"=>{"type"=>"transfer", "snapshot_id"=>"10178f11-4e05-4076-b7c9-006e95919a1b",
"opponent_id"=>"aaff5bef-42fb-4c9f-90e0-29f69176b7d4", "asset_id"=>"815b0b1a-2764-3736-8faa-42d694fa620a",
"amount"=>"-1", "trace_id"=>"89025aab-598f-43e5-834a-2feaa01797ff",
"memo"=>"hKFBxBDG0McoJiRCm44N2dGbZZL6oVOhQqFQpDc3NzehVKFM", "created_at"=>"2019-05-27T06:53:07.135709255Z", "counter_user_id"=>"aaff5bef-42fb-4c9f-90e0-29f69176b7d4"}}
"The Order id is 89025aab-598f-43e5-834a-2feaa01797ff It's needed by cancel-order!"
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取消挂单

Ocean.one将trace_id当做订单，比如上面的例子， 89025aab-598f-43e5-834a-2feaa01797ff 就是订单号，我们用他来取消订单。

if ocmd == "c"p "Input the Order ID: "orderid = gets.chompmemo1 = Base64.encode64(MessagePack.pack({'O' => UUID.parse(orderid).to_raw}))memo = memo1.sub("\n","")assetsInfo = walletAccount.read_asset(CNB_ASSET_ID)if assetsInfo["data"]["balance"].to_f > 0transInfo = walletAccount.create_transfer(walletAccount.encrypt_pin(DEFAULT_PIN),{asset_id: CNB_ASSET_ID,opponent_id: OCEANONE_BOT,amount: "0.00000001",trace_id: SecureRandom.uuid,memo: memo})p transInfoelsep "Not enough CNB!"end
end
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通过读取资产余额，来确认到帐情况

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
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源代码执行

编译执行，即可开始交易了.

源代码执行

编译执行，即可开始交易了.

• ruby bitcoin-wallet-ruby.rb 运行.

本代码执行时的命令列表:

• 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!):

完整代码