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Bytom Dapp開發流程少是什么

發布時間:2021-12-20 16:27:09 來源:億速云 閱讀:158 作者:iii 欄目:互聯網科技

本篇內容主要講解“Bytom Dapp開發流程少是什么”,感興趣的朋友不妨來看看。本文介紹的方法操作簡單快捷,實用性強。下面就讓小編來帶大家學習“Bytom Dapp開發流程少是什么”吧!

整體流程

開發流程分為,1)編寫智能合約;2)發合約交易;3)測試解鎖合約方法;4)基于插件錢包開發Dapp前端;5)開發后端;

流程貌似非常簡單,本人在1,2,3 步浪費了很多時間。其中有些坑踩過接下來介紹一下;

1)編寫智能合約,上面提供的 比原鏈DAPP開發流程,寫得很清楚,使用的是equity非常簡單,直接下載最新版 用命令 【./equity TradeOffer --instance 】 就能得到一串編譯后的合約程序代碼,簡稱智能合約程序。

E:\GoWorks\src\github.com\equity\equity>equity.exe jiedai_6.txt --instance ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff 260374 260474 260574 260674 260774 260874 260874 00141ccef16d2ac1ab22baa8acfa1633fdc32df
d55aa b1f38553d95177c53755996baf523da006da977008f069792bb6a2c3b6a253fb

======= PartLoanCollateral =======
Instantiated program:

20b1f38553d95177c53755996baf523da006da977008f069792bb6a2c3b6a253fb1600141ccef16d2ac1ab22baa8acfa1633fdc32dfd55aa030afb03030afb0303a6fa030342fa0303def903037af9030316f90320ffffffffffffffffffffffffffffffffffffffffffffffffffffffffff
ffffff4d2b015b7a76529c641d010000640c0100005c7900a0695c790500f2052a01947600a0695379cd9f5579cda09a916164380000005a95639a00000054798ccd9f5679cda09a916164500000005895639a00000055798ccd9f5779cda09a916164680000005695639a00000056798ccd
9f5879cda09a916164800000005495639a00000057798ccd9f5979cda09a916164980000005295639a0000005195c3787ca169c3787c9f916164f5000000005e795479515e79c1695178c2516079c16952c3527994c251006079895f79895e79895d79895c79895b79895a79895979895879
895779895679890274787e008901c07ec1696307010000005e795479515e79c16951c3c2516079c169632b010000587acd9f6900c3c2515c7ac1632b010000755b7aaa5b7a8800c3c2515d7ac1747800c0

2)發合約交易, 先解釋一下合約的邏輯,儲蓄分紅合約太復雜,所以我們用幣幣交易合約去舉例子,

contract TradeOffer(assetRequested: Asset,

                    amountRequested: Amount,

                    seller: Program,

                    cancelKey: PublicKey) locks valueAmount of valueAsset {

  clause trade() {

    lock amountRequested of assetRequested with seller

    unlock valueAmount of valueAsset

  }

  clause cancel(sellerSig: Signature) {

    verify checkTxSig(cancelKey, sellerSig)

    unlock valueAmount of valueAsset

  }

}

看看智能合約的交易圖,方便小白理解:

Bytom Dapp開發流程少是什么

所以儲蓄分紅合約一開始肯定要鎖定一部分資產,所以必須部署合約交易。那么如何觸發呢?

本人通過PC錢包的接口方式去部署合約,具體很多例子可以在智能合約學習文檔看到。

PC錢包方式,所有交易都必須三部,build-transaction,sign-transaction,submit-transaction,三個接口。

踩過的坑

  1. 調試智能合約很慢,要等到交易確認才能知道是否成功,而且報錯不明顯,不知道哪里出問題;

    解決方案:

本地PC錢包solonet模式調試,更改源碼,快速出塊 difficulty/difficulty.go

func CheckProofOfWork(hash, seed *bc.Hash, bits uint64) bool { 
    compareHash := tensority.AIHash.Hash(hash, seed)   
    return HashToBig(compareHash).Cmp(CompactToBig(bits)) <= 0
}

里面那句添加 ||true 如下

return HashToBig(compareHash).Cmp(CompactToBig(bits)) <= 0 || true

一開始沒想到這樣做,以為很快調試好,搞了三天晚上10點才調試完。

2.智能合約對于除法的支持很不友好,盡量不要用除法,一開始寫了一個很復雜的合約,不知道錯誤,智能逐步改代碼快速調試去定位,最后發現 A/B,如果A=B沒問題,否則就直接報錯,問過官方沒有得到合適的回答,我嘗試過是存證這種問題,非常坑。

3.程序必須計算好對應結果utxo 流轉action的 input、ouput ;如下

{

 "base_transaction": null,
 "actions": [
   {
     "output_id": "13fbd1e5df196a1488e85e3b5983e51444c49ef3695df789c9473abb636e0f5c",
     "arguments": [
       {
         "type": "integer",
         "raw_data": {
           "value": 5500000000
         }
       },   {
   			"type": "data",
   			"raw_data": {
   				"value": "00141ccef16d2ac1ab22baa8acfa1633fdc32dfd55aa"
   			}
   		},
           {
             "type": "integer",
             "raw_data": {
               "value": 0
             }
           }
         ],
         "type": "spend_account_unspent_output"
       },
       {
         "amount": 5500000000,
         "asset_id": "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
         "control_program": "0014d470cdd1970b58b32c52ecc9e71d795b02c79a65",
         "type": "control_program"
       },
       {
         "amount": 5000000000,
         "asset_id": "80013f81a66cb99977879e31639bb4fe4b12b4c7050fe518585d3f7f159d26a9",
         "control_program": "00141ccef16d2ac1ab22baa8acfa1633fdc32dfd55aa",
         "type": "control_program"
       },
       {
         "amount": 9999995000000000,
         "asset_id": "80013f81a66cb99977879e31639bb4fe4b12b4c7050fe518585d3f7f159d26a9",
         "control_program": "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",
         "type": "control_program"
       },
       {
         "account_id": "0U374V0300A02",
         "amount": 5500000000,
         "asset_id": "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
         "type": "spend_account"
       },
       {
         "account_id": "0U374V0300A02",
         "amount": 20000000,
         "asset_id": "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
         "type": "spend_account"
       }
     ],
     "ttl": 10000
   }

一個解鎖合約交易要包含action類型有,

spend_account_unspent_output (合約的參數),

spend_account (輸入的資產描述),

control_program或者control_address (接收者資產描述),

可以理解成質量守恒

如上面例子

spend_account_unspent_output 的action里面有個output_id =13fbd1e5df196a1488e85e3b5983e51444c49ef3695df789c9473abb636e0f5c,這個資產的小數位為8(這里沒有體現),代表我要解鎖這個utxo,他的值為 100000000.00000000 就是1億。

拆分成兩個action,一個 50.00000000,一個 99999950.00000000

只有btm = ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff 需要用來等手續費,所以允許不守恒,最后由曠工挖礦拿到手續費。

總結:那么程序相當于要把合約里面的邏輯整合進去,才能計算好真正的input、output~~我理解是交易確認的時候,解鎖合約的程序驗證現在的input、ouput是否跟合約一樣。

3)測試解鎖合約方法,2)里面采坑已經說清楚這個問題了,補充一下就是最好一下子不要寫太復雜的合約,從簡單來開發調試。一定要注意質量守恒定律,只要懂了這個原理其實非常簡單。

4)基于插件錢包開發Dapp前端, 這塊具體可以看插件錢包API,儲蓄分紅合約前端源代碼,里面說的非常清楚, 涉及到的接口,暫時他們API文檔還沒有整理出來,來自上一章說的blockcenter的接口

url地址 :testnet: 'http://app.bycoin.io:3020/', mainnet: 'https://api.bycoin.im:8000/'

核心用到的接口有:

根據合約與資產ID查詢UTXO接口

/api/v1/btm/q/list-utxos

參數:
{    
    "filter": {                    "script":"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", 
        "asset":"80013f81a66cb99977879e31639bb4fe4b12b4c7058585d3f7f159d26a9" ,
        "unconfirmed":false
    },    
    "sort":  {
        "by":"amount", 
        "order":"desc" 
        }
}

unconfirmed ,代表是否確認的,這個對后期的并發問題非常有用,第三章我會詳細說明。

結果
{
    "code": 200,
    "msg": "",
    "result": {
        "_links": {},
        "data": [
            {
                "hash": "16749b694a9f1bc6a7759cf66baefed4c864b65985e7488e8721184ecc4d6965",
                "asset": "80013f81a66cb99977879e31639bb4fe4b12b4c7058585d3f7f159d26a9",
                "amount": 3000000000
            },
            {
                "hash": "e5f75036b6f662ff705378b55dd29dc1a43acb23d701dd44a068cdab2c43ad0c",
                "asset": "80013f81a66cb99977879e31639bb4fe4b12b4c7058585d3f7f159d26a9",
                "amount": 15000000000
            }
        ],
        "limit": 10,
        "start": 0
    }
}

(自己準備參數調用一下,以上是例子而已)

查詢用戶地址信息與余額接口

/api/v1/btm/account/list-addresses

參數

{"guid":"b414005b-b501-4a0e-8b0f-e1cd762272f4"}

結果
{

	"code": 200,

	"msg": "",

	"result": {

		"_links": {},

		"data": [{

			"guid": "b414005b-b501-4a0e-8b0f-e1cd762272f4",

			"address": "bm1qp4t6thlyktt6sh02scs8dqcpnk3ufk9e9pmq9s",

			"label": "",

			"balances": [{

				"asset": "80013f81a66cb99977879e31639bb4fe4b12b4c7050fe518585d3f7f159d26a9",

				"balance": "68900000000",

				"total_received": "69000000000",

				"total_sent": "100000000",

				"decimals": 8,

				"alias": "",

				"in_usd": "0.00",

				"in_cny": "0.00",

				"in_btc": "0.000000"

			}, {

				"asset": "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",

				"balance": "1329551000",

				"total_received": "53790000000",

				"total_sent": "52460449000",

				"decimals": 8,

				"alias": "btm",

				"in_usd": "1.45",

				"in_cny": "10.10",

				"in_btc": "0.000142"

			}]

		}],

		"limit": 10,

		"start": 0

	}

}

ps:

guid是專門插件錢包提供的,是唯一的,這個非常有用,第三章我會詳細說。

查詢交易信息

/api/v1/btm/account/list-transactions

參數

{"address":"bm1qp4t6thlyktt6sh02scs8dqcpnk3ufk9e9pmq9s","start":0,"limit":100}

結果
{
	"code": 200,
	"msg": "",
	"result": {
		"data": [{
			"ID": 111,
			"Hash": "471e5b267f646546be33505773186ee9d8dde2180a515df67a90d1a5f9d17bd2",
			"AssetID": "80013f81a66cb99977879e31639bb4fe4b12b4c7050fe518585d3f7f159d26a9",
			"Amount": 7000000000,
			"Address": "bm1qp4t6thlyktt6sh02scs8dqcpnk3ufk9e9pmq9s",
			"BaseID": 5,
			"Timestamp": "2019-07-08T09:23:12+08:00",
			"Height": 263728,
			"TransactionID": "471e5b267f646546be33505773186ee9d8dde2180a515df67a90d1a5f9d17bd2",
			"InputAmount": 5700000000
		}, {
			"ID": 64,
			"Hash": "e69631a8d6321d738793646399ffe022ac177a5732f562970e706ee76d49de82",
			"AssetID": "80013f81a66cb99977879e31639bb4fe4b12b4c7050fe518585d3f7f159d26a9",
			"Amount": 5000000000,
			"Address": "bm1qp4t6thlyktt6sh02scs8dqcpnk3ufk9e9pmq9s",
			"BaseID": 5,
			"Timestamp": "2019-07-05T16:37:07+08:00",
			"Height": 262170,
			"TransactionID": "e69631a8d6321d738793646399ffe022ac177a5732f562970e706ee76d49de82",
			"InputAmount": 5500000000
		}, {
			"ID": 56,
			"Hash": "cf74906808a1a6bc6a056c148510d542a10d2cbc350a4d830c670aa5ba973873",
			"AssetID": "80013f81a66cb99977879e31639bb4fe4b12b4c7050fe518585d3f7f159d26a9",
			"Amount": 39000000000,
			"Address": "bm1qp4t6thlyktt6sh02scs8dqcpnk3ufk9e9pmq9s",
			"BaseID": 5,
			"Timestamp": "2019-07-03T14:59:22+08:00",
			"Height": 261006,
			"TransactionID": "cf74906808a1a6bc6a056c148510d542a10d2cbc350a4d830c670aa5ba973873",
			"InputAmount": 8900000000
		}, {
			"ID": 54,
			"Hash": "6aedf609d47b3c06de2ce7dc9f2c99895124c80074573cd29407ac3b34ef8d40",
			"AssetID": "80013f81a66cb99977879e31639bb4fe4b12b4c7050fe518585d3f7f159d26a9",
			"Amount": 2000000000,
			"Address": "bm1qp4t6thlyktt6sh02scs8dqcpnk3ufk9e9pmq9s",
			"BaseID": 5,
			"Timestamp": "2019-07-03T12:11:12+08:00",
			"Height": 260936,
			"TransactionID": "6aedf609d47b3c06de2ce7dc9f2c99895124c80074573cd29407ac3b34ef8d40",
			"InputAmount": 5200000000
		}]
	}
}

5)開發后端,相當于bufferserver,第三章詳細說明順便我解析一下bufferserver的源碼內容,還有里面踩過的坑。

到此,相信大家對“Bytom Dapp開發流程少是什么”有了更深的了解,不妨來實際操作一番吧!這里是億速云網站,更多相關內容可以進入相關頻道進行查詢,關注我們,繼續學習!

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