https://github.com/ethereumjs/ethereumjs-common/blob/master/docs/index.md
该API的调用的详细例子可见ethereumjs/ethereumjs-common-3-test
Common
Common class to access chain and hardfork parameters
访问链和硬分叉参数的Common类
Parameters输入参数
-
chain
(String | Number | Dictionary) String ('mainnet') or Number (1) chain 可以使用字符串(如'mainnet')或数字(如1)表示链 -
hardfork
String String identifier ('byzantium') for hardfork (optional) (可选项)使用字符串标识('byzantium')表示 -
supportedHardforks
Array Limit parameter returns to the given hardforks (optional) (可选项)返回给硬分叉的限制参数
调用:
let c = new Common('mainnet')//使用的是mainnet链
let c = new Common('mainnet', 'byzantium')
let c = new Common('mainnet', 'byzantium', ['byzantium', 'constantinople'])
⚠️如果你连接的是自己私有的chain,初始化的方式是:
let chainParams = require('./testnet.json') //testnet.json中是具体的链描述信息
let c = new Common(chainParams, 'byzantium')
testnet.json为:
{
"name": "testnet",
"chainId": 12345,
"networkId": 12345,
"comment": "Private test network",
"genesis": {
"hash": "0xaa00000000000000000000000000000000000000000000000000000000000000",
"timestamp": null,
"gasLimit": 1000000,
"difficulty": 1,
"nonce": "0xbb00000000000000",
"extraData": "0xcc000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
"stateRoot": "0xdd00000000000000000000000000000000000000000000000000000000000000"
},
"hardforks": [
{
"name": "chainstart",
"block": 0,
"consensus": "poa",
"finality": null
},
{
"name": "homestead",
"block": 1,
"consensus": "poa",
"finality": null
},
{
"name": "tangerineWhistle",
"block": 2,
"consensus": "poa",
"finality": null
},
{
"name": "spuriousDragon",
"block": 3,
"consensus": "poa",
"finality": null
},
{
"name": "byzantium",
"block": 4,
"consensus": "poa",
"finality": null
}
],
"bootstrapNodes": [
{
"ip": "10.0.0.1",
"port": 30303,
"id": "11000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
"location": "",
"comment": ""
},
{
"ip": "10.0.0.2",
"port": 30303,
"id": "22000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000",
"location": "",
"comment": ""
}
]
}
注意:
let chainParams = require('./testnet.json')
delete chainParams['hardforks'] //如果有任何内容的缺失,初始化时将报错
let c = new Common(chainParams, 'byzantium') //报错
setChain
Sets the chain 设置链
Parameters
-
chain
(String | Number | Dictionary) String ('mainnet') or Number (1) chain representation. Or, a Dictionary of chain parameters for a private network. 可以使用字符串(如'mainnet')或数字(如1)表示链。或者对于私有网络则使用链参数字典
调用:
let c = new Common('mainnet')
c.setChain('ropsten') //重新将链设置为ropsten
setHardfork
Sets the hardfork to get params for
设置硬叉以获取参数
Parameters
-
hardfork
String String identifier ('byzantium')使用字符串标识('byzantium')表示
调用:
let c = new Common('mainnet')
c.param('gasPrices', 'ecAdd', 'byzantium') //500 c.setHardfork('byzantium')
st.equal(c.param('gasPrices', 'ecAdd') //
_chooseHardfork
Internal helper function to choose between hardfork set and hardfork provided as param
内部帮助函数,用于在硬分叉集中选择并提供其为参数
Parameters
-
hardfork
String Hardfork given to function as a parameter 作为函数参数的硬分叉 onlySupported
Returns String Hardfork chosen to be used 返回选择使用的硬分叉
_getHardfork
Internal helper function, returns the params for the given hardfork for the chain set
内部帮助函数,返回链集的给定硬分叉的参数
Parameters
-
hardfork
String Hardfork name 硬分叉名字
Returns Dictionary
_isSupportedHardfork
Internal helper function to check if a hardfork is set to be supported by the library
内部帮助函数,查看设置的硬分叉是否被库支持
Parameters
-
hardfork
String Hardfork name 硬分叉的名字
Returns Boolean True if hardfork is supported 如果硬分叉被支持则返回true
调用:
let c = new Common('mainnet', 'byzantium', ['byzantium', 'constantinople'])
c._isSupportedHardfork('byzantium') //返回true
c._isSupportedHardfork('spuriousDragon') //返回false
param
Returns the parameter corresponding to a hardfork
返回与硬分叉相关联的参数
Parameters
-
topic
String Parameter topic ('gasConfig', 'gasPrices', 'vm', 'pow', 'casper', 'sharding') 参数主题(有'gasConfig', 'gasPrices', 'vm', 'pow', 'casper', 'sharding') -
name
String Parameter name (e.g. 'minGasLimit' for 'gasConfig' topic) 参数名字 (比如'gasConfig' 主题中的 'minGasLimit' ) -
hardfork
String Hardfork name, optional if hardfork set 影分叉的名字,如果硬分叉集可选
调用:
let c = new Common('mainnet')
c.param('gasPrices', 'ecAdd', 'byzantium') // c.setHardfork('byzantium')
st.equal(c.param('gasPrices', 'ecAdd') //
paramByBlock
Returns a parameter for the hardfork active on block number
返回在区块数中活跃硬分叉的参数
Parameters
-
topic
String Parameter topic 参数主体 -
name
String Parameter name 参数名 -
blockNumber
Number Block number 区块数
调用:
let c = new Common('mainnet', 'byzantium')
c.paramByBlock('pow', 'minerReward', ) //'3000000000000000000'
hardforkIsActiveOnBlock
Checks if set or provided hardfork is active on block number
查看是否设置了或提供的硬分叉在区块数中是活跃的
Parameters
-
hardfork
String Hardfork name or null (for HF set) 硬分叉名字或null -
blockNumber
Number 区块数 -
opts
Array-
opts.onlySupported
Array.Boolean optional, only allow supported HFs (default: false) (可选的)表示只支持HFs ,即初始化时自己设置的supportedHardforks
(默认为false)
-
Returns Boolean
调用:
let c = new Common('ropsten')
c.hardforkIsActiveOnBlock('byzantium', ) //返回true,等价于下面的
c.activeOnBlock() //返回true c.hardforkIsActiveOnBlock('byzantium', )//返回true
c.hardforkIsActiveOnBlock('byzantium', ) //返回false
c = new Common('ropsten', 'byzantium')
c.hardforkIsActiveOnBlock(null, ) //true,因为上面已经设置链分叉为 'byzantium',所以这里使用的是null
c.hardforkIsActiveOnBlock(null, ) //true
c.hardforkIsActiveOnBlock(null, ) //false
activeOnBlock
Alias to hardforkIsActiveOnBlock when hardfork is set
当硬分叉被设置时,其为hardforkIsActiveOnBlock的别名
Parameters
-
blockNumber
Number区块数 -
opts
Array-
opts.onlySupported
Array.Boolean optional, only allow supported HFs (default: false)(可选的)表示只支持HFs ,即初始化时自己设置的supportedHardforks
(默认为false)
-
Returns Boolean
调用:
c = new Common('ropsten', 'byzantium')//当分叉已经设置时
c.hardforkIsActiveOnBlock(null, ) //true,或使用
c.activeOnBlock()
hardforkGteHardfork
Sequence based check if given or set HF1 is greater than or equal HF2
基于序列的检查是否给定的或设置的硬分叉1强过或等同于硬分叉2时
Parameters
-
hardfork1
String Hardfork name or null (if set) 硬分叉名字或null -
hardfork2
String Hardfork name 硬分叉名字 -
opts
Array-
opts.onlyActive
Array.Boolean optional, only active HFs (default: false)(可选的)表示活跃HFs(默认为false) -
opts.onlySupported
Array.Boolean optional, only allow supported HFs (default: false)(可选的)表示只支持HFs ,即初始化时自己设置的supportedHardforks
(默认为false)
-
Returns Boolean
调用:
let c = new Common('ropsten')
c.hardforkGteHardfork('constantinople', 'byzantium') //返回true,因为constantinople >= byzantium (provided)
c.hardforkGteHardfork('spuriousDragon', 'byzantium') //false
gteHardfork
Alias to hardforkGteHardfork when hardfork is set
当硬分叉被设置时其为hardforkGteHardfork别名
Parameters
-
hardfork
String Hardfork name硬分叉名字 -
opts
Array-
opts.onlyActive
Array.Boolean optional, only active HFs (default: false)(可选的)表示活跃HFs(默认为false) -
opts.onlySupported
Array.Boolean optional, only allow supported HFs (default: false)(可选的)表示只支持HFs ,即初始化时自己设置的supportedHardforks
(默认为false)
-
Returns Boolean
调用:
c = new Common('ropsten', 'byzantium') //当分叉已经被设置时
c.hardforkGteHardfork(null, 'spuriousDragon') //返回true,或使用下面
c.gteHardfork('spuriousDragon') //true
hardforkIsActiveOnChain
Checks if given or set hardfork is active on the chain
检查是否给定的或设置的硬分叉在链上是活跃的
Parameters
-
hardfork
String Hardfork name, optional if HF set 硬分叉名字 -
opts
Array-
opts.onlySupported
Array.Boolean optional, only allow supported HFs (default: false) 可选的)表示只支持HFs ,即初始化时自己设置的supportedHardforks
(默认为false)
-
Returns Boolean
调用:
let c = new Common('ropsten')
c.hardforkIsActiveOnChain('byzantium') //true
c.hardforkIsActiveOnChain('dao') //false
c.hardforkIsActiveOnChain('spuriousDragon', { onlySupported: true })//因为这里并没有设置,但是使用了onlySupported: true,所以会报出"spuriousDragon"为不支持的分叉的错误 c = new Common('ropsten', 'byzantium')
c.hardforkIsActiveOnChain() //true,即设置的'byzantium'在ropsten链中活跃
activeHardforks
Returns the active hardfork switches for the current chain
返回当前链的活跃硬分叉开关
Parameters
-
blockNumber
Number up to block if provided, otherwise for the whole chain 如果提供则查询至该指定区块,否则为整条链 -
opts
Array-
opts.onlySupported
Array.Boolean optional, limit results to supported HFs (default: false)(可选的)表示只支持HFs ,即初始化时自己设置的supportedHardforks
(默认为false)
-
Returns Array Array with hardfork arrays 硬分叉数组
调用:
let c = new Common('ropsten')
c.activeHardforks().length //返回5,说明ropsten链中有5个活跃分叉类型
c.activeHardforks()[]['name'] //'spuriousDragon'
c.activeHardforks().length //返回3,即直到区块9有的活跃分叉个数为3
c = new Common('ropsten', null, ['spuriousDragon', 'byzantium', 'constantinople'])
c.activeHardforks(null, { onlySupported: true }).length //返回2 ,onlySupported: true说明只支持supportedHardforks里面的分叉,所以返回的结果就从5变成了2,只包含了2个活跃分叉类型
activeHardfork
Returns the latest active hardfork name for chain or block or throws if unavailable
返回链或区块最新的活跃硬分叉的名字,如果不可行则抛出错误
Parameters
-
blockNumber
Number up to block if provided, otherwise for the whole chain如果提供则查询至该指定区块,否则为整条链 -
opts
Array-
opts.onlySupported
Array.Boolean optional, limit results to supported HFs (default: false)(可选的)表示只支持HFs ,即初始化时自己设置的supportedHardforks
(默认为false)
-
Returns String Hardfork name 硬分叉名
调用:
let c = new Common('ropsten')
c.activeHardfork() //返回byzantium ,说明整条链最新的分叉为byzantium
c.activeHardfork() //返回spuriousDragon,即到区块10的最新分叉类型为spuriousDragon
c = new Common('ropsten', null, ['tangerineWhistle', 'spuriousDragon'])
c.activeHardfork(null, { onlySupported: true }) //返回'spuriousDragon',因为supportedHardforks
里最新的类型为它
hardforkBlock
Returns the hardfork change block for hardfork provided or set
为提供或设置的硬分叉返回硬分叉改变块
Parameters
-
hardfork
String Hardfork name, optional if HF set 硬分叉名,如果硬分叉集设置则可选
Returns Number Block number 返回区块数
例子:
let c = new Common('ropsten')
c.hardforkBlock('byzantium') //返回1700000,得到byzantium分叉开始的区块数
isHardforkBlock
True if block number provided is the hardfork (given or set) change block of the current chain
如果提供的区块数是目前链的硬分叉(给定或设置的)改变区块,则返回true
Parameters
-
blockNumber
Number Number of the block to check 查看的区块数 -
hardfork
String Hardfork name, optional if HF set 硬分叉名,如果硬分叉集设置则可选
Returns Boolean
调用:
let c = new Common('ropsten')
c.isHardforkBlock() //返回true
c.isHardforkBlock() //返回false
consensus共识
Provide the consensus type for the hardfork set or provided as param
为设置或提供的硬分叉集提供共识类型作为参数
Parameters
-
hardfork
String Hardfork name, optional if hardfork set 硬分叉名,如果硬分叉集设置则可选
Returns String Consensus type (e.g. 'pow', 'poa') 返回共识类型(如'pow', 'poa')
let c = new Common('mainnet')
c.consensus('byzantium') //返回byzantium分叉共识为'pow'
finality
Provide the finality type for the hardfork set or provided as param
为设置或提供的硬分叉集提供结束类型作为参数
Parameters
-
hardfork
String Hardfork name, optional if hardfork set 硬分叉名,如果硬分叉集设置则可选
Returns String Finality type (e.g. 'pos', null of no finality) 结束类型(如'pos',没有则为null)
调用:
let c = new Common('mainnet')
c.finality('byzantium') //null
genesis
Returns the Genesis parameters of current chain
返回当前链的初始状态参数
Returns Dictionary Genesis dict 初始字典
如:
"genesis": {
"hash": "0xd4e56740f876aef8c010b86a40d5f56745a118d0906a34e69aec8c0db1cb8fa3",
"timestamp": null,
"gasLimit": ,
"difficulty": ,
"nonce": "0x0000000000000042",
"extraData": "0x11bbe8db4e347b4e8c937c1c8370e4b5ed33adb3db69cbdb7a38e1e50b1b82fa",
"stateRoot": "0xd7f8974fb5ac78d9ac099b9ad5018bedc2ce0a72dad1827a1709da30580f0544"
}
调用:
let c = new Common('mainnet')
c.genesis().hash //返回"0xd4e56740f876aef8c010b86a40d5f56745a118d0906a34e69aec8c0db1cb8fa3"
hardforks
Returns the hardforks for current chain返回当前链的硬分叉
Returns Array Array with arrays of hardforks 硬分叉的数组
如:
"hardforks": [
{
"name": "chainstart",
"block": ,
"consensus": "pow",
"finality": null
},
{
"name": "homestead",
"block": ,
"consensus": "pow",
"finality": null
}
]
调用:
let c = new Common('mainnet')
c.hardforks()[]['block']//返回
hardfork
Returns the hardfork set 返回硬分叉集
Returns String Hardfork name 硬分叉名字
调用:
let c = new Common('mainnet', 'byzantium')
c.hardfork() //返回'byzantium'
bootstrapNodes
Returns bootstrap nodes for the current chain 返回当前链的bootstrap节点
Returns Dictionary Dict with bootstrap nodes bootstrap节点字典
如:
"bootstrapNodes": [
{
"ip": "13.93.211.84",
"port": ,
"id": "3f1d12044546b76342d59d4a05532c14b85aa669704bfe1f864fe079415aa2c02d743e03218e57a33fb94523adb54032871a6c51b2cc5514cb7c7e35b3ed0a99",
"location": "US-WEST",
"comment": "Go Bootnode"
},
{
"ip": "191.235.84.50",
"port": ,
"id": "78de8a0916848093c73790ead81d1928bec737d565119932b98c6b100d944b7a95e94f847f689fc723399d2e31129d182f7ef3863f2b4c820abbf3ab2722344d",
"location": "BR",
"comment": "Go Bootnode"
}
]
调用:
let c = new Common('mainnet')
c.bootstrapNodes()[].port //返回:
chainId
Returns the Id of current chain 返回当前链的ID
Returns Number chain Id
调用:
let c = new Common('mainnet')
c.chainId() //返回1
chainName
Returns the name of current chain 返回当前链的名字
Returns String chain name (lower case) (小写)
调用:
let c = new Common('mainnet')
c.chainName() //返回'mainnet'
networkId
Returns the Id of current network 返回当前网络的ID
Returns Number network Id
调用:
let c = new Common('mainnet')
c.networkId() //返回1