共识节点管理
CITA 采用共识节点管理系统合约来实现共识节点的管理,通过区块链上的合约可以保证共识节点的安全性及一致性。
在 CITA 初始化创世块阶段,需要初始化一个超级管理员地址,其拥有超级管理员角色,将其写入到每个节点的创世块文件中,共识节点管理合约拥有的一个固定地址也写入其中。创世块内容在初始化以后不允许被修改。区块链正常启动之后,将合约写入到创世块中。链外的操作人员可以通过调用 RPC 接口来实现对共识节点的管理。
对于共识节点的管理,包括添加、删除及设置共识节点出块权重。下面我们将用具体的示例来阐述。
- 增加共识节点 - 操作只可由超级管理员执行;
- 删除共识节点 - 操作只可由超级管理员执行;
- 设置共识节点权重。
增加共识节点
节点需先被添加成为普通节点(参考普通节点管理),才能申请成为共识节点,由超级管理员(拥有超级管理员角色的账号)确认才完成了添加操作。
从普通节点升级到共识节点,具体操作需要用到上面合约方法 approveNode(address)
。
共识节点管理合约是系统合约,默认将放在创世块上,下面使用 solc 命令(solidity 的命令行编译器,在 CITA 镜像中已安装)查看共识节点管理合约的 hash:
# solc --hashes system/node_manager.sol --allow-paths .
contract address: 0xffffffffffffffffffffffffffffffffff020001
Function signatures:
dd4c97a0: approveNode(address)
2d4ede93: deleteNode(address)
30ccebb5: getStatus(address)
609df32f: listNode()
6ed3876d: listStake()
51222d50: setStake(address,uint64)
0c829315: stakePermillage(address)
645b8b1b: status(address)
首先需要启动一条链,具体方法见快速入门部分
接下来的测试,用 cita-cli 命令行模式(与交互式模式的命令是一致的)进行演示。
查看当前的共识节点列表:
$ cita-cli scm NodeManager listNode --url http://127.0.0.1:1337
输出:
{
"id": 1,
"jsonrpc": "2.0",
"result": "0x00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000004000000000000000000000000d0f05f536ffc6a5d27b17cd14a544418b0500e92000000000000000000000000cccda2959225fc79f61f99bed213bd1172a7ea830000000000000000000000000014e2a75b4b5399f09732ecb6ed1a5b389c9e700000000000000000000000003e91911ba91b10dfa41f0a34d4a3c5a4f838eace"
}
返回值为目前的共识节点地址列表。
下面我们需要将新增的普通节点通过交易的方式升级为共识节点,新增的普通节点的公钥地址,演示中,为 0x59a316df602568957f47973332f1f85ae1e2e75e
。
approve 节点
- 发送交易
$ cita-cli scm NodeManager approveNode \
--address 0x59a316df602568957f47973332f1f85ae1e2e75e \
--admin-private 0x5f0258a4778057a8a7d97809bd209055b2fbafa654ce7d31ec7191066b9225e6 \
--url http://127.0.0.1:1337
其中 --admin-privkey
是超级管理员私钥,系统默认的超级管理员私钥可以看 [超级管理员账户信息]。
输出:
{
"id": 3,
"jsonrpc": "2.0",
"result": {
"hash": "0x286402ed9e27a11dbbcf5fc3b8296c36f66cb39068a3c468c632ee370e81bdb2",
"status": "OK"
}
}
获取 receipt
$ cita-cli rpc getTransactionReceipt \ --hash 0x286402ed9e27a11dbbcf5fc3b8296c36f66cb39068a3c468c632ee370e81bdb2 \ --url http://127.0.0.1:1337
输出:
{ "id": 1, "jsonrpc": "2.0", "result": { "blockHash": "0xe7bb245d4ee718703746241c8cf3352063c7761b789b79a74a991d993f6d48e1", "blockNumber": "0xba", "contractAddress": null, "cumulativeQuotaUsed": "0x11660", "errorMessage": null, "quotaUsed": "0x11660", "logs": [ { "address": "0xffffffffffffffffffffffffffffffffff020001", "blockHash": "0xe7bb245d4ee718703746241c8cf3352063c7761b789b79a74a991d993f6d48e1", "blockNumber": "0xba", "data": "0x", "logIndex": "0x0", "topics": [ "0x5d55f24dd047ef52a5f36ddefc8c424e4b26c8415d8758be1bbb88b5c65e04eb", "0x00000000000000000000000059a316df602568957f47973332f1f85ae1e2e75e" ], "transactionHash": "0x286402ed9e27a11dbbcf5fc3b8296c36f66cb39068a3c468c632ee370e81bdb2", "transactionIndex": "0x0", "transactionLogIndex": "0x0" } ], "logsBloom": "0x00000000000000020040000000000000000200000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000040000000000000000000000000000000000000000000010000000000000000000000000000000000000000000100000000000000000000000000000000000000000000000000000000000000000000000000020000000000800000000000000002000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000", "root": null, "transactionHash": "0x286402ed9e27a11dbbcf5fc3b8296c36f66cb39068a3c468c632ee370e81bdb2", "transactionIndex": "0x0" } }
从
log
中可以看出本次操作的相关信息。
查看当前的共识节点数
$ cita-cli scm NodeManager listNode --url http://127.0.0.1:1337
<br />输出:
```json
{
"id": 1,
"jsonrpc": "2.0",
"result": "0x00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000005000000000000000000000000d0f05f536ffc6a5d27b17cd14a544418b0500e92000000000000000000000000cccda2959225fc79f61f99bed213bd1172a7ea830000000000000000000000000014e2a75b4b5399f09732ecb6ed1a5b389c9e700000000000000000000000003e91911ba91b10dfa41f0a34d4a3c5a4f838eace00000000000000000000000059a316df602568957f47973332f1f85ae1e2e75e"
}
返回值为目前的共识节点地址列表(可以看到新添加的共识节点地址 `0x59a316df602568957f47973332f1f85ae1e2e75e`)
## 删除共识节点
按照以上方法,普通节点可以被添加为共识节点,那么共识节点怎么删除呢?下面是删除共识节点的示例:
删除共识节点需要由超级管理员来完成, 具体操作需要调用 deleteNode(address) 合约方法。
### 获取当前的共识节点列表:
```bash
$ cita-cli scm NodeManager listNode --url http://127.0.0.1:1337
输出:
{
"id": 1,
"jsonrpc": "2.0",
"result": "0x00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000005000000000000000000000000d0f05f536ffc6a5d27b17cd14a544418b0500e92000000000000000000000000cccda2959225fc79f61f99bed213bd1172a7ea830000000000000000000000000014e2a75b4b5399f09732ecb6ed1a5b389c9e700000000000000000000000003e91911ba91b10dfa41f0a34d4a3c5a4f838eace00000000000000000000000059a316df602568957f47973332f1f85ae1e2e75e"
}
(由于接着上面步骤操作,所以这里有五个共识节点)
删除共识节点
- 发送交易
$ cita-cli scm NodeManager deleteNode \
--address 0x59a316df602568957f47973332f1f85ae1e2e75e \
--admin-private 0x5f0258a4778057a8a7d97809bd209055b2fbafa654ce7d31ec7191066b9225e6 \
--url http://127.0.0.1:1337
其中 --admin-privkey
是超级管理员私钥,系统默认的超级管理员私钥可以看 [超级管理员账户信息]。
输出:
{
"id": 3,
"jsonrpc": "2.0",
"result": {
"hash": "0x01a4eac643589780090d5ed9fa1ac56d139776dd79ebc74a6414594d4d607393",
"status": "OK"
}
}
获取 receipt
$ cita-cli rpc getTransactionReceipt \ --hash 0x01a4eac643589780090d5ed9fa1ac56d139776dd79ebc74a6414594d4d607393 \ --url http://127.0.0.1:1337
输出:
{ "id": 1, "jsonrpc": "2.0", "result": { "blockHash": "0xc57c25447a24f7bd2b0d5699dfa151ba42456309d9da70101cfb3f599ec77c8d", "blockNumber": "0x1db", "contractAddress": null, "cumulativeQuotaUsed": "0x558c", "errorMessage": null, "quotaUsed": "0x558c", "logs": [ { "address": "0xffffffffffffffffffffffffffffffffff020001", "blockHash": "0xc57c25447a24f7bd2b0d5699dfa151ba42456309d9da70101cfb3f599ec77c8d", "blockNumber": "0x1db", "data": "0x", "logIndex": "0x0", "topics": [ "0x74976f07ac4bfb6a02b2dbd3bc158d4984ee6027d938e870692126ca9e1931d5", "0x00000000000000000000000059a316df602568957f47973332f1f85ae1e2e75e" ], "transactionHash": "0x01a4eac643589780090d5ed9fa1ac56d139776dd79ebc74a6414594d4d607393", "transactionIndex": "0x0", "transactionLogIndex": "0x0" } ], "logsBloom": "0x00000000000000020040000000000000000200000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000100000000000000000000000000100000000000000000000000000000000000000000000000000000000000800000000000000002000000000000000000000000400000000000000000000000000000000002000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000", "root": null, "transactionHash": "0x01a4eac643589780090d5ed9fa1ac56d139776dd79ebc74a6414594d4d607393", "transactionIndex": "0x0" } }
从
log
中可以看出本次操作的相关信息。
查看当前的共识节点数
$ cita-cli scm NodeManager listNode --url http://127.0.0.1:1337
输出:
{
"id": 1,
"jsonrpc": "2.0",
"result": "0x00000000000000000000000000000000000000000000000000000000000000200000000000000000000000000000000000000000000000000000000000000004000000000000000000000000d0f05f536ffc6a5d27b17cd14a544418b0500e92000000000000000000000000cccda2959225fc79f61f99bed213bd1172a7ea830000000000000000000000000014e2a75b4b5399f09732ecb6ed1a5b389c9e700000000000000000000000003e91911ba91b10dfa41f0a34d4a3c5a4f838eace"
}
返回值为目前的共识节点地址列表(可以看到新添加的共识节点地址 59a316df602568957f47973332f1f85ae1e2e75e 已经删除了)
以上代码的返回值有所删减,实际操作会略有不同
设置共识节点的出块权重
CITA 作为许可链共识节点采用轮流出块的方式进行出块。作为公有许可链可以根据节点的出块权重分配出块权,超级管理员可以设置每个出块节点的 Stake 来调整出块权重。
出块权重按照每个出块节点所占的千分比进行分配,对于小数部分采用的 Largest_remainder_method 算法进行分配。 每次出块时,查询共识节点的权重,根据权重计算出每个节点在 1000 个块中可以出的块个数,这 1000 个块算为一个 epoch,再将这1000个块出块顺序以创世块的时间戳为种子进行随机排序。 如果在同一个 epoch 中出块节点列表和权重没有变化,共识将会按照此顺序进行出块;如果节点列表和权重有变化,将按照新的顺序进行出块。
我们提供 setStake 接口 可对共识节点出块权重进行配置。