区块链搭建以及智能合约的运行

( 强烈建议所有操作在root下搭建环境和运行. )

实现目标:区块链技术-智能合约-以太坊 (译文)

安装环境ethereum&solc

(此处参考:区块链技术-智能合约-以太坊(译文) , smartsponsor-github )

安装ethereum,solc

sudo apt-get install software-properties-common

sudo add-apt-repository -y ppa:ethereum/ethereum

sudo apt-get update

sudo apt-get install ethereum

sudo apt-get install solc

配置创世块

创建genesis.json,内容如下,复制至/root/.ethereum下

{

“nonce”: “0x0000000000000042”,

“timestamp”: “0x0”,

“parentHash”: “0x0000000000000000000000000000000000000000000000000000000000000000”,

“extraData”: “0x0”,

“gasLimit”: “0x8000000”,

“difficulty”: “0x400”,

“mixhash”: “0x0000000000000000000000000000000000000000000000000000000000000000”,

“coinbase”: “0x3333333333333333333333333333333333333333”,

“alloc”: { }

}

执行初始化:

geth --nodiscover --maxpeers 0 init genesis.json

打开私有链方法:

geth --datadir "~/ethdev" --dev console 2>> geth.log

另:

geth --rpc --rpcport 8000 --rpccorsdomain '"*"' --mine --minerthreads 1 --maxpeers 0 --nodiscover --networkid 3301 console

安装node

(此处参考:https://bitshuo.com/topic/58ce7b2d0a3de8932e6f75ba)

此处需要先安装nodejs. ubuntu直接安装的node版本过低,选择直接在官网上下载:https://nodejs.org/en/download/,注意应下载源码.将其复制到/root目录下

cd node

./configure

make -j4

sudo make install

安装testrpc

(此处参考:http://blog.csdn.net/wo541075754/article/details/53155578)

执行命令安装testrpc:

sudo npm install -g ethereumjs-testrpc

执行testrpc测试,报错:

Secp256k1 bindings are not compiled. Pure JS implementation will be used.

……

Error: Module version mismatch. Expected 48, got 46.

at Error (native)

at Object.Module._extensions..node (module.js:597:18)

at Module.load (module.js:487:32)

at tryModuleLoad (module.js:446:12)

at Function.Module._load (module.js:438:3)

at Module.require (module.js:497:17)

at require (internal/module.js:20:19)

at Object. (/usr/local/lib/node_modules/ethereumjs-testrpc/node_modules/scrypt/index.js:3:20)

at Module._compile (module.js:570:32)

at Object.Module._extensions..js (module.js:579:10)

解决办法: 打开报错文件/usr/local/lib/node_modules/ethereumjs-testrpc/node_modules/scrypt/index.js:存在

“use strict”;

var scryptNative = require(“./build/scrypt”)

, Crypto = require(“crypto”)

, Os = require(“os”);

实际上./build/scrypt不存在,而同级目录下有scrypt,修改为:

“use strict”;

var scryptNative = require(“scrypt”)

, Crypto = require(“crypto”)

, Os = require(“os”);

再次testrpc,通过.

安装truffle

执行命令安装truffle

sudo npm install -g truffle

1. eth.getCompilers()为空问题?

解决办法:



被某文章误导,将安装的solc和solcjs删除(/usr/local/bin/和/usr/local/lib/node_modules/下)



sudo apt-get remove solc, sudo apt-get install solc

手动添加 admin.setSolc(“”)

即可.

2. info和code找不到?

解决办法:

srcCompiled.smartSponsor

改为

srcCompiled["<stdin>:smartSponsor"]

3. loadScript(“./smartsponsor.js”)只有信息true,而没有log的问题?

由于4个账户没有解锁,解决办法:

personal.unlockAccount(eth.accounts[0],"123456",10000)

personal.unlockAccount(eth.accounts[1],"123456",10000)

personal.unlockAccount(eth.accounts[2],"123456",10000)

personal.unlockAccount(eth.accounts[3],"123456",10000)

> loadScript("./smartsponsor.js")

Contract transaction send: TransactionHash: 0x6cccd9aff2063101500b9e400ac43955dd1f58cde63142f038b6337cb30d37e8 waiting to be mined...

true

> Contract mined! Address: 0xc9274287d6365cb235ffbbc871ae75972677a090

[object Object]

4. 支付问题?

Error: Cannot send value to non-payable function.——无法支付到非支付功能.(问题未解决.考虑到可能为个例,最好再尝试其他合约.)



解决办法,需要在合约源码中修改,function pledge添加”payable”:

function pledge(bytes32 _message) payable { … }

实例测试完成.