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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:
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：
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：
/api/v1/btm/q/list-utxos
{
"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。
{
"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）
/api/v1/btm/account/list-addresses
{"guid":"b414005b-b501-4a0e-8b0f-e1cd762272f4"}
{
"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。
/api/v1/btm/account/list-transactions
{"address":"bm1qp4t6thlyktt6sh02scs8dqcpnk3ufk9e9pmq9s","start":0,"limit":100}
{
"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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