bytom中怎么锁定合约

这篇文章主要介绍"bytom中怎么锁定合约"，在日常操作中，相信很多人在bytom中怎么锁定合约问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答"bytom中怎么锁定合约"的疑惑有所帮助！接下来，请跟着小编一起来学习吧！

模板如下：

contract TradeOffer(assetRequested: Asset,                    amountRequested: Amount,                    seller: Program,                    cancelKey: PublicKey) locks offered {  clause trade() requires payment: amountRequested of assetRequested {    lock payment with seller    unlock offered  }  clause cancel(sellerSig: Signature) {    verify checkTxSig(cancelKey, sellerSig)    unlock offered  }}

锁定合约

第一步：调用create-account-receiver 生成 control_program

以下是相关代码片段：

sendHttpPost("{\"account_id\":\"0IJVD7MNG0A02\"}","create-account-receiver","http://127.0.0.1:9888","");

第二步调用list-pubkeys 获取 pubkey

以下是相关代码片段：

sendHttpPost("{\"account_id\":\"0IJVD7MNG0A02\"}","list-pubkeys","http://127.0.0.1:9888","");

第三步： 将1 2步获取的值调用compile接口编译合约获得program 合约程序

以下是相关代码片段：

            JSONObject param=new JSONObject();            JSONArray agrs=new JSONArray();            //合约的四个参数值            JSONObject assetParam=new JSONObject();            assetParam.put("string","81d097312645696daea84b761d2898d950d8fba0de06c9267d8513b16663dd3a");            agrs.put(assetParam);            JSONObject amountParam=new JSONObject();            amountParam.put("integer",200000000l);            agrs.put(amountParam);            JSONObject programParam=new JSONObject();            programParam.put("string",control_program);            agrs.put(programParam);            JSONObject publicKeyParam=new JSONObject();            publicKeyParam.put("string",pubkey);            agrs.put(publicKeyParam);            param.put("agrs",agrs);            param.put("contract","contract TradeOffer(assetRequested: Asset, amountRequested: Amount, seller: Program, cancelKey: PublicKey) locks offered { clause trade() requires payment: amountRequested of assetRequested { lock payment with seller unlock offered } clause cancel(sellerSig: Signature) { verify checkTxSig(cancelKey, sellerSig) unlock offered } }");            //调用编译合约            sendHttpPost(param.toString(),"list-pubkeys","http://127.0.0.1:9888","");

第四步：将program 传入build-transaction接口去build一个交易的到data

以下是相关代码片段：

            param=new JSONObject();            agrs=new JSONArray();            JSONObject spendAccount=new JSONObject();            spendAccount.put("account_id","0H757LPD00A02");            spendAccount.put("amount",9909099090000l);            spendAccount.put("asset_id","161b9767b664df907fa926a31f9e835236e57f3e9ccc5f80c12bd97723322652");            spendAccount.put("type","spend_account");            agrs.put(spendAccount);            JSONObject controlAccount=new JSONObject();            controlAccount.put("control_program",program);            controlAccount.put("amount",9909099090000l);            controlAccount.put("asset_id","161b9767b664df907fa926a31f9e835236e57f3e9ccc5f80c12bd97723322652");            controlAccount.put("type","control_program");            agrs.put(controlAccount);            JSONObject spendAccount2=new JSONObject();            spendAccount2.put("account_id","0H757LPD00A02");            spendAccount2.put("amount",6000000l);            spendAccount2.put("asset_id","ffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff");            spendAccount2.put("type","spend_account");            agrs.put(spendAccount2);            param.put("actions",agrs);            param.put("ttl",0);            sendHttpPost(param.toString(),"build-transaction","http://127.0.0.1:9888","");

第五步：输入密码调用sign-transaction签名第四步build的data 得到raw_transaction

以下是相关代码片段：

            param=new JSONObject();            param.put("password","xxx");            param.put("transaction",data);            sendHttpPost(param.toString(),"sign-transaction","http://127.0.0.1:9888","");

第六步：调用submit-transactions提交交易

以下是相关代码片段：

            param=new JSONObject();            param.put("raw_transaction",raw_transaction);            sendHttpPost(param.toString(),"submit-transactions","http://127.0.0.1:9888","");

解锁/取消合约

首先需要decode出生成合约时候的参数

调用list-unspent-outputs 获取生成的合约信息获取program

以下是相关代码片段：

param=new JSONObject();        param.put("id",outputid);        param.put("smart_contract",true);        sendHttpPost(param.toString(),"list-unspent-outputs","http://127.0.0.1:9888","");

调用decode-program 传入获取生成的合约参数信息

以下是相关代码片段：

param=new JSONObject();        param.put("program",program);        sendHttpPost(param.toString(),"decode-program","http://127.0.0.1:9888","");

需要注意的是decode出来的为值是逆序的(后续会有文章详细介绍)

解锁/取消其实就是把生成合约的步骤中的第三步去掉,替换调用生成合约第四步的参数即可

取消合约的构造参数如下：

                spendAccountUnspentOutput = arguments: [{                  type: 'raw_tx_signature',                  // 生成合约第二步的pubkeylist 详情                  raw_data: {                    derivation_path: pubkeylist.pubkey_infos[0].derivation_path,                    xpub: pubkeylist.root_xpub                  }                }, {                  type: 'data',                  raw_data: {                    // 参数偏移量 在一个合约里是固定的                     value: '13000000'                  }                }],                output_id: output_id,                type: 'spend_account_unspent_output'              }              const controlAction = {                type: 'control_program',                amount: 100000000,                asset_id: asset_id,                control_program:control_program              }              const gasAction = {                type: 'spend_account',                account_id:account_id,                asset_alias: 'BTM',                amount: 50000000              }

执行合约的参数构造如下：

           const spendAccountUnspentOutput = {                arguments: [{                  type: 'data',                  raw_data: {                    //  00000000 指的是第一个 clause，表示直接执行，无需跳转                    value: '00000000'                  }                }],                output_id: output_id,                type: 'spend_account_unspent_output'              }              // 合约执行提供的资产              const issueControlAction = {                control_program: control_program,                amount:  100000000,                asset_id: asset_id,                type: 'control_program'              }              // 合约执行提供的资产              const issueSpendAction = {                account_id: account_id,                amount: 100000000,                asset_id: asset_id,                type: 'spend_account'              }              // 矿工费              const gasAction = {                type: 'spend_account',                account_id: account_id,                asset_alias: 'BTM',                amount: 50000000              }              // 合约执行获得资产对象              const controlAction = {                type: 'control_program',                amount:  100000000,                asset_id: asset_id,                control_program: compileData.control_program              }

build 操作其实就是指定输入输出的过程,详情请查看 官方build文档 和 官方api文档

备注

调用比原基于okhttp接口javautil 如下：

    public static String sendHttpPost(String bodyStr,String method,String bytomApiserverUrl,String bytomApiserverToken) throws IOException {        OkHttpClient client = new OkHttpClient();        MediaType mediaType = MediaType.parse("application/json");        RequestBody body = RequestBody.create(mediaType, bodyStr);        Request request = new Request.Builder()                .url(bytomApiserverUrl+"/"+method)                .post(body)                .addHeader("cache-control", "no-cache")                .addHeader("Connection", "close")                .build();        if (bytomApiserverUrl==null || bytomApiserverUrl.contains("127.0.0.1") || bytomApiserverUrl.contains("localhost")){        }else {            byte[] encodedAuth = Base64.encodeBase64(bytomApiserverToken.getBytes(Charset.forName("US-ASCII")));            String authHeader = "Basic " + new String(encodedAuth);            request = new Request.Builder()                    .url(bytomApiserverUrl+"/"+method)                    .post(body)                    .addHeader("authorization", authHeader)                    .addHeader("cache-control", "no-cache")                    .addHeader("Connection", "close")                    .build();        }        Response response = client.newCall(request).execute();        return response.body().string();    }

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