eosio代币合约教程

时间:2018-07-04作者:klpeng分类:IT综合浏览:1980评论:0

eosio代币合约教程

Eosio.token, Exchange与Eosio.msig合约

本节内容假设您已掌握《智能合约入门》一节。

现在,其实已经搭建起来的区块链并不能做多少事情,所以,首先让我们来部署一个代币合约eosio.token。这个合约能让许多不同的代币同时在一个智能合约上发行,但是却能被不同用户管理。

在发行一个代币前,我们需要建立一个账户用来部署代币合约。

cleos create account eosio eosio.token 公钥1 公钥2

以上命令创建了一个名为eosio.token的账户。

然后,将位于${EOS根目录}/build/contracts/eosio.token的文件部署到eosio.token账户。

cleos set contract eosio.token build/contracts/eosio.token -p eosio.token     Reading WAST...     Assembling WASM...     Publishing contract... executed transaction: 528bdbce1181dc5fd72a24e4181e6587dace8ab43b2d7ac9b22b2017992a07ad 8708 bytes 10000 cycles eosio <= eosio::setcode {"account":"eosio.token","vmtype":0,"vmversion":0,"code":"0061736d0100000001ce011d60067f7e7f7f7f7f00... eosio <= eosio::setabi {"account":"eosio.token","abi":{"types":[],"structs":[{"name":"transfer","base":"","fields":[{"name"...

创建一个代币

以下是代币发型合约eosio.token的标准接口,文件位于 contracts/eosio.token/eosio.token.hpp:

   void create( account_name issuer,
                asset        maximum_supply,
                uint8_t      can_freeze,
                uint8_t      can_recall,
                uint8_t      can_whitelist );

   void issue( account_name to, asset quantity, string memo );

   void transfer( account_name from,
                  account_name to,
                  asset        quantity,
                  string       memo );

译者注:开发过以太坊ERC20代币的一定熟悉,ERC20规范了totalSupply(), balanceOf(), transfer(), transferFrom()等六个方法。eosio.token也做了类似规范,只要是create(),issue(),transfer()三个方法构造的代码,就是一个发币智能合约。

如果需要创建一个代币,首先需要执行create(...)方法,在这个方法中,maximum_supply代表需要发行的资产,用字符串表示,比如发行10亿个BOS,则为"1000000000.0000 BOS"。发行方issuer必须是经过授权的能够执行发行资产issue、冻结资产freezing、召回资产recall、设置白名单whitelist等操作。

下面用cleos命令来创建一个名为BOS的代币,发行量为10亿,精度为小数点后4位:

$ cleos push action eosio.token create '[ "eosio", "1000000000.0000 EOS", 0, 0, 0]' -p eosio.token
执行结果:
executed transaction: 0e49a421f6e75f4c5e09dd738a02d3f51bd18a0cf31894f68d335cd70d9c0e12  260 bytes  1000 cycles
#   eosio.token <= eosio.token::create          {"issuer":"eosio","maximum_supply":"1000000000.0000 EOS","can_freeze":0,"can_recall":0,"can_whitelis...

另外,还有一种较为复杂的方式,使用JSON格式的参数:

$ cleos push action eosio.token create '{"issuer":"eosio", "maximum_supply":"1000000000.0000 EOS", "can_freeze":0, "can_recall":0, "can_whitelist":0}' -p eosio.token
执行结果
executed transaction: 0e49a421f6e75f4c5e09dd738a02d3f51bd18a0cf31894f68d335cd70d9c0e12  260 bytes  1000 cycles
#   eosio.token <= eosio.token::create          {"issuer":"eosio","maximum_supply":"1000000000.0000 EOS","can_freeze":0,"can_recall":0,"can_whitelis...

由于创建的代币需要“拥有”这个代币的命名空间(如EOS),因而获得eosio.token智能合约的权限,所以在以上命令中,有一个参数 -p eosio.token

让账户user发行代币

现在,我们来创建一个代币,代币的发行方为账户user。 可以使用如下命令:

$ cleos push action eosio.token issue '[ "user", "100.0000 EOS", "memo" ]' -p eosio
执行结果:
executed transaction: 822a607a9196112831ecc2dc14ffb1722634f1749f3ac18b73ffacd41160b019  268 bytes  1000 cycles
#   eosio.token <= eosio.token::issue           {"to":"user","quantity":"100.0000 EOS","memo":"memo"}
>> issue
#   eosio.token <= eosio.token::transfer        {"from":"eosio","to":"user","quantity":"100.0000 EOS","memo":"memo"}
>> transfer
#         eosio <= eosio.token::transfer        {"from":"eosio","to":"user","quantity":"100.0000 EOS","memo":"memo"}
#          user <= eosio.token::transfer        {"from":"eosio","to":"user","quantity":"100.0000 EOS","memo":"memo"}

这次操作,输出的信息中出现了一个issue和三个transfer。但是,我们只签名了一个操作issue,怎么会出现三个transfer呢?这是因为这个issue操作带动了inline transfer(内联交易操作),并且这个内联交易操作通知了发送方和接收方的帐号。以上三个transfer显示了所有的操作细节,包括操作命令、顺序等等。

如果需要查看被广播的实际交易,可以使用-d -j选项来指示:不要广播,以JSON形式返回交易内容,如下:

$ cleos push action eosio.token issue '["user", "100.0000 EOS", "memo"]' -p eosio -d -j
结果如下:
{
  "expiration": "2018-04-01T15:20:44",
  "region": 0,
  "ref_block_num": 42580,
  "ref_block_prefix": 3987474256,
  "net_usage_words": 21,
  "kcpu_usage": 1000,
  "delay_sec": 0,
  "context_free_actions": [],
  "actions": [{
      "account": "eosio.token",
      "name": "issue",
      "authorization": [{
          "actor": "eosio",
          "permission": "active"
        }
      ],
      "data": "00000000007015d640420f000000000004454f5300000000046d656d6f"
    }
  ],
  "signatures": [
    "EOSJzPywCKsgBitRh9kxFNeMJc8BeD6QZLagtXzmdS2ib5gKTeELiVxXvcnrdRUiY3ExP9saVkdkzvUNyRZSXj2CLJnj7U42H"
  ],
  "context_free_data": []
}

将代币转到账户tester

经过上一步操作,账户user已经拥有了代币,现在我们将25个EOS转给账户tester。我们使用选项 -p user来授权这个操作。

$ cleos push action eosio.token transfer '[ "user", "tester", "25.0000 EOS", "m" ]' -p user
执行结果:
executed transaction: 06d0a99652c11637230d08a207520bf38066b8817ef7cafaab2f0344aafd7018  268 bytes  1000 cycles
#   eosio.token <= eosio.token::transfer        {"from":"user","to":"tester","quantity":"25.0000 EOS","memo":"m"}
>> transfer
#          user <= eosio.token::transfer        {"from":"user","to":"tester","quantity":"25.0000 EOS","memo":"m"}
#        tester <= eosio.token::transfer        {"from":"user","to":"tester","quantity":"25.0000 EOS","memo":"m"}

部署交易所合约

与上述例子类似,我们也可以部署交易所exchange合约。exchange合约提供了创建与交易代币的功能。这个部署需要在EOSIO的根目录进行。 第一步:创建exchange帐号

$ cleos create account eosio exchange 公钥1 公钥2
执行结果:
executed transaction: 4d38de16631a2dc698f1d433f7eb30982d855219e7c7314a888efbbba04e571c  364 bytes  1000 cycles
#         eosio <= eosio::newaccount            {"creator":"eosio","name":"exchange","owner":{"threshold":1,"keys":[{"key":"EOS7ijWCBmoXBi3CgtK7DJxe...

第二步:创建exchange智能合约

$ cleos set contract exchange build/contracts/exchange -p exchange
执行结果:
Reading WAST...
Assembling WASM...
Publishing contract...
executed transaction: 5a63b4de8a1da415590778f163c5ed26dc164c960185b20fd834c297cf7fa8f4  35172 bytes  10000 cycles
#         eosio <= eosio::setcode               {"account":"exchange","vmtype":0,"vmversion":0,"code":"0061736d0100000001f0023460067f7e7f7f7f7f00600...
#         eosio <= eosio::setabi                {"account":"exchange","abi":{"types":[{"new_type_name":"account_name","type":"name"}],"structs":[{"n...

部署Eosio.msig多人签名合约

eosio.msig合约用来允许多方共同对一个交易进行异步签名。 EOSIO已经在基础层上支持多方签名,但是需要一个异步通道来传递交易并签名。eosio.msg 是一个非常友好的异步提议、确认、最终发布交易的方式。 下面是部署eosio.msig合约的步骤。 第一步:创建eosio.msig账户:

$ cleos create account eosio eosio.msig 公钥1 公钥2 
执行结果:
#         eosio <= eosio::newaccount            {"creator":"eosio","name":"eosio.msig","owner":{"threshold":1,"keys":[{"key":"EOS7ijWCBmoXBi3CgtK7DJ...

第二步:部署eosio.msig合约:

$ cleos set contract eosio.msig build/contracts/eosio.msig -p eosio.msig
执行结果:
Reading WAST...
Assembling WASM...
Publishing contract...
executed transaction: a113a7db8c878dfd894671792770b59a04efb3aa8295f5b3d585daf89c314ec9  8964 bytes  10000 cycles
#         eosio <= eosio::setcode               {"account":"eosio.msig","vmtype":0,"vmversion":0,"code":"0061736d0100000001bd011b60047f7e7e7f0060047...
#         eosio <= eosio::setabi                {"account":"eosio.msig","abi":{"types":[{"new_type_name":"ac
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