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Bytom Dapp开发流程少是什么

发布时间:2021-12-20 16:27:09 来源:亿速云 阅读:158 作者:iii 栏目:互联网科技

本篇内容主要讲解“Bytom Dapp开发流程少是什么”,感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷,实用性强。下面就让小编来带大家学习“Bytom Dapp开发流程少是什么”吧!

整体流程

开发流程分为,1)编写智能合约;2)发合约交易;3)测试解锁合约方法;4)基于插件钱包开发Dapp前端;5)开发后端;

流程貌似非常简单,本人在1,2,3 步浪费了很多时间。其中有些坑踩过接下来介绍一下;

1)编写智能合约,上面提供的 比原链DAPP开发流程,写得很清楚,使用的是equity非常简单,直接下载最新版 用命令 【./equity TradeOffer --instance 】 就能得到一串编译后的合约程序代码,简称智能合约程序。

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)发合约交易, 先解释一下合约的逻辑,储蓄分红合约太复杂,所以我们用币币交易合约去举例子,

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

  }

}

看看智能合约的交易图,方便小白理解:

Bytom Dapp开发流程少是什么

所以储蓄分红合约一开始肯定要锁定一部分资产,所以必须部署合约交易。那么如何触发呢?

本人通过PC钱包的接口方式去部署合约,具体很多例子可以在智能合约学习文档看到。

PC钱包方式,所有交易都必须三部,build-transaction,sign-transaction,submit-transaction,三个接口。

踩过的坑

  1. 调试智能合约很慢,要等到交易确认才能知道是否成功,而且报错不明显,不知道哪里出问题;

    解决方案:

本地PC钱包solonet模式调试,更改源码,快速出块 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

一开始没想到这样做,以为很快调试好,搞了三天晚上10点才调试完。

2.智能合约对于除法的支持很不友好,尽量不要用除法,一开始写了一个很复杂的合约,不知道错误,智能逐步改代码快速调试去定位,最后发现 A/B,如果A=B没问题,否则就直接报错,问过官方没有得到合适的回答,我尝试过是存证这种问题,非常坑。

3.程序必须计算好对应结果utxo 流转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
   }

一个解锁合约交易要包含action类型有,

spend_account_unspent_output (合约的参数),

spend_account (输入的资产描述),

control_program或者control_address (接收者资产描述),

可以理解成质量守恒

如上面例子

spend_account_unspent_output 的action里面有个output_id =13fbd1e5df196a1488e85e3b5983e51444c49ef3695df789c9473abb636e0f5c,这个资产的小数位为8(这里没有体现),代表我要解锁这个utxo,他的值为 100000000.00000000 就是1亿。

拆分成两个action,一个 50.00000000,一个 99999950.00000000

只有btm = ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff 需要用来等手续费,所以允许不守恒,最后由旷工挖矿拿到手续费。

总结:那么程序相当于要把合约里面的逻辑整合进去,才能计算好真正的input、output~~我理解是交易确认的时候,解锁合约的程序验证现在的input、ouput是否跟合约一样。

3)测试解锁合约方法,2)里面采坑已经说清楚这个问题了,补充一下就是最好一下子不要写太复杂的合约,从简单来开发调试。一定要注意质量守恒定律,只要懂了这个原理其实非常简单。

4)基于插件钱包开发Dapp前端, 这块具体可以看插件钱包API,储蓄分红合约前端源代码,里面说的非常清楚, 涉及到的接口,暂时他们API文档还没有整理出来,来自上一章说的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:

根据合约与资产ID查询UTXO接口

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

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

unconfirmed ,代表是否确认的,这个对后期的并发问题非常有用,第三章我会详细说明。

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

(自己准备参数调用一下,以上是例子而已)

查询用户地址信息与余额接口

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

参数

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

结果
{

	"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是专门插件钱包提供的,是唯一的,这个非常有用,第三章我会详细说。

查询交易信息

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

参数

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

结果
{
	"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)开发后端,相当于bufferserver,第三章详细说明顺便我解析一下bufferserver的源码内容,还有里面踩过的坑。

到此,相信大家对“Bytom Dapp开发流程少是什么”有了更深的了解,不妨来实际操作一番吧!这里是亿速云网站,更多相关内容可以进入相关频道进行查询,关注我们,继续学习!

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