Bytom 储蓄分红 DAPP 开发指南

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储蓄分红DAPP

储蓄分红合约简介

储蓄分红合约指的是项目方发起了一个锁仓计划(即储蓄合约和取现合约),用户可以在准备期自由选择锁仓金额参与该计划,等到锁仓到期之后还可以自动获取锁仓的利润。用户可以在准备期内(dueBlockHeight)参与储蓄,按照合约规定可以 1:1 获取同等数量的储蓄票据资产,同时用户锁仓的资产(deposit)将放到取现合约中,并且项目方是无法动用的,等到锁仓期限(expireBlockHeight)一到,用户便可以调用取现合约将自己储蓄的资产连本待息一同取出来。其示意图如下:

从上图中可以看出,项目方发布了一个利润为20%的锁仓项目,其中储蓄合约FixedLimitCollect锁定了1000个票据资产(bill),同时项目方将200个储蓄资产(deposit)锁定到利息合约中。待项目方发布完合约之后,所有用户便可以参与了。例如上图中user1调用合约储蓄了500,这500个储蓄资产将被锁定在取现合约FixedLimitProfit中,同时user1获得了500个票据资产,剩余找零的资产将继续锁定在储蓄合约FixedLimitCollect中,以此类推,user2user3也是相同的流程,直到储蓄合约没有资产为止。取现合约FixedLimitProfit跟储蓄合约的模型大致相同,只是取现合约是由多个UTXO组成的,用户在取现的时候可以并行操作。但是如果合约中的面值不能支持用户一次性取现的话,需要分多次提取。例如user1拥有500个票据资产,而可以获得的本息总额为600,但是取现的UTXO面值为500,那么user1一次最多只能取500,剩下的100需要再构造一笔交易来提现。

合约源代码

// 储蓄合约
import "./FixedLimitProfit"
contract FixedLimitCollect(assetDeposited: Asset,
                        totalAmountBill: Amount,
                        totalAmountCapital: Amount,
                        dueBlockHeight: Integer,
                        expireBlockHeight: Integer,
                        additionalBlockHeight: Integer,
                        banker: Program,
                        bankerKey: PublicKey) locks billAmount of billAsset {
    clause collect(amountDeposited: Amount, saver: Program) {
        verify below(dueBlockHeight)
        verify amountDeposited <= billAmount && totalAmountBill <= totalAmountCapital
        define sAmountDeposited: Integer = amountDeposited/100000000
        define sTotalAmountBill: Integer = totalAmountBill/100000000
        verify sAmountDeposited > 0 && sTotalAmountBill > 0
        if amountDeposited < billAmount {
            lock amountDeposited of assetDeposited with FixedLimitProfit(billAsset, totalAmountBill, totalAmountCapital, expireBlockHeight, additionalBlockHeight, banker, bankerKey)
            lock amountDeposited of billAsset with saver
            lock billAmount-amountDeposited of billAsset with FixedLimitCollect(assetDeposited, totalAmountBill, totalAmountCapital, dueBlockHeight, expireBlockHeight, additionalBlockHeight, banker, bankerKey)
        } else {
            lock amountDeposited of assetDeposited with FixedLimitProfit(billAsset, totalAmountBill, totalAmountCapital, expireBlockHeight, additionalBlockHeight, banker, bankerKey)
            lock billAmount of billAsset with saver
        }
    }
    clause cancel(bankerSig: Signature) {
        verify above(dueBlockHeight)
        verify checkTxSig(bankerKey, bankerSig)
        unlock billAmount of billAsset
    }
}
// 取现合约(本金加利息)
contract FixedLimitProfit(assetBill: Asset,
                        totalAmountBill: Amount,
                        totalAmountCapital: Amount,
                        expireBlockHeight: Integer,
                        additionalBlockHeight: Integer,
                        banker: Program,
                        bankerKey: PublicKey) locks capitalAmount of capitalAsset {
    clause profit(amountBill: Amount, saver: Program) {
        verify above(expireBlockHeight)
        define sAmountBill: Integer = amountBill/100000000
        define sTotalAmountBill: Integer = totalAmountBill/100000000
        verify sAmountBill > 0 && sTotalAmountBill > 0 && amountBill < totalAmountBill
        define gain: Integer = totalAmountCapital*sAmountBill/sTotalAmountBill
        verify gain > 0 && gain <= capitalAmount
        if gain < capitalAmount {
            lock amountBill of assetBill with banker
            lock gain of capitalAsset with saver
            lock capitalAmount - gain of capitalAsset with FixedLimitProfit(assetBill, totalAmountBill, totalAmountCapital, expireBlockHeight, additionalBlockHeight, banker, bankerKey)
        } else {
            lock amountBill of assetBill with banker
            lock capitalAmount of capitalAsset with saver
        }
    }
    clause cancel(bankerSig: Signature) {
        verify above(additionalBlockHeight)
        verify checkTxSig(bankerKey, bankerSig)
        unlock capitalAmount of capitalAsset
    }
}

合约的源代码说明可以具体参考Equity合约介绍.

注意事项:

编译并实例化合约

编译Equity合约可以参考一下Equity编译器的介绍说明。假如储蓄合约FixedLimitCollect的参数如下:

assetDeposited          :c6b12af8326df37b8d77c77bfa2547e083cbacde15cc48da56d4aa4e4235a3ee
totalAmountBill         :10000000000
totalAmountCapital      :20000000000
dueBlockHeight          :1070
expireBlockHeight       :1090
additionalBlockHeight   :1100
banker                  :0014dedfd406c591aa221a047a260107f877da92fec5
bankerKey               :055539eb36abcaaf127c63ae20e3d049cd28d0f1fe569df84da3aedb018ca1bf

其中bankerKey是管理员的publicKey,可以通过比原链的接口list-pubkeys来获取,注意管理员需要保存一下对应的rootXpubPath,否则无法正确调用clause cancel

实例化合约命令如下:

// 储蓄合约
./equity FixedLimitCollect --instance c6b12af8326df37b8d77c77bfa2547e083cbacde15cc48da56d4aa4e4235a3ee 10000000000 20000000000 1070 1090 1100 0014dedfd406c591aa221a047a260107f877da92fec5 055539eb36abcaaf127c63ae20e3d049cd28d0f1fe569df84da3aedb018ca1bf

// 取现合约
./equity FixedLimitProfit --instance c6b12af8326df37b8d77c77bfa2547e083cbacde15cc48da56d4aa4e4235a3ee 10000000000 20000000000 1090 1100 0014dedfd406c591aa221a047a260107f877da92fec5 055539eb36abcaaf127c63ae20e3d049cd28d0f1fe569df84da3aedb018ca1bf

发布合约交易

发布合约交易即将资产锁定到合约中。由于目前无法在比原的dashboard上构造合约交易,所以需要借助外部工具来发送合约交易,比如postman。按照上述示意图所示,项目方需要发布1000个储蓄资产的储蓄合约和200个利息资产取现合约。假设项目方需要发布1000个储蓄资产(假如精度为8,那么1000个在比原链中表示为100000000000)的锁仓合约,那么他需要将对应数量的票据锁定在储蓄合约中,其交易模板如下:

{
  "base_transaction": null,
  "actions": [
    {
      "account_id": "0ILGLSTC00A02",
      "amount": 20000000,
      "asset_id": "ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff",
      "type": "spend_account"
    },
    {
      "account_id": "0ILGLSTC00A02",
      "amount": 100000000000,
      "asset_id": "13016eff73ffb7539a69e122f80f5c1cc94446773ac3f64dec290429f87e73b3",
      "type": "spend_account"
    },
    {
      "amount": 100000000000,
      "asset_id": "13016eff73ffb7539a69e122f80f5c1cc94446773ac3f64dec290429f87e73b3",
      "control_program": "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",
      "type": "control_program"
    }
  ],
  "ttl": 0,
  "time_range": 1521625823
}

合约交易成功后,合约control_program对应的UTXO将会被所有用户查询到,使用比原链的接口list-unspent-outputs即可查询。

此外,开发者需要存储一下合约UTXOassetIDprogram,以便在DAPP的前端页面的config配置文件和bufferserver缓冲服务器中调用。如上所示:

// 储蓄合约
assetID:13016eff73ffb7539a69e122f80f5c1cc94446773ac3f64dec290429f87e73b3
program: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

// 取现合约
assetID:c6b12af8326df37b8d77c77bfa2547e083cbacde15cc48da56d4aa4e4235a3ee
program: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

储蓄分红DAPP架构模型

比原链的DAPP总体框架模型描述了DAPP的大致结构模型,结合储蓄分红合约案例,其具体流程如下:

DAPP前端

储蓄分红合约前端逻辑处理流程大致如下:

DAPP缓冲服务器

缓冲服务器主要是为了在管理合约UTXO层面做一些效率方面的处理,包括了对bycoin服务器是如何同步请求的,此外对DAPP的相关交易记录也进行了存储。具体可以参考一下bufferserver源代码

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