本文作者:先河系统杨尉
目录
-
3 filecoin开发网使用
- 3.1 辅助资源
- 3.2 使用
- 3.2.1 接入filecoin开发网络
- 3.2.2 获取Mock FIL用于测试
- 3.2.3 矿工操作
- 3.2.3.1 存储矿工
- 3.2.3.2 检索矿工
- 3.2.3.3 修复矿工
- 3.2.4 客户操作
- 3.2.4.1 存储客户
- 3.2.4.2 检索客户
- 3.2.5 filecoin合约
- 3.2.5.1 文件合约
- 3.2.5.2 智能合约
- 3.2.6 单机运行多个filecoin节点
- 3.2.6.1 修改资源目录和服务端口的方式
- 3.2.6.2 容器部署方式
3 filecoin开发网络使用
3.1 辅助资源
-
Filecoin状态: https://stats.kittyhawk.wtf
- 网络
- 存储实时价格 FIL/GB/Month
- 当前存储容量 GB
- 当前网络利用率
- 检索平均价格
- 激活节点以及分布图
- 存储平均价格曲线
- best tipset
- 存储矿工
- 存储矿工数量变化曲线
- 存储矿工共识结果
- 近30天的矿工top图
- 检索矿工
- 平均检索价格
- 平均检索时间
- 平均检索容量
- FIL指数
- 流通FIL及抵押FIL变化曲线图
- FIL地址总数
- FIL总抵押数及对应存储空间
- FIL总数上升曲线图
- FIL区块奖励下降曲线图
- 网络
-
Filecoin区块浏览器: http://user.kittyhawk.wtf:8000
- Chain信息
- BestBlock信息
- Actor合约信息
-
获取FIL用于抵押或支付:http://user.kittyhawk.wtf:9797
- 获取Mock FIL代币
-
Dashboard: http://user.kittyhawk.wtf:8010
- Network概览,最新区块信息
- 区块浏览器链接
-
Genesis File: http://user.kittyhawk.wtf:8020/genesis.car
- 创始文件,用于初始化filecoin资源
-
Prometheus Endpoint: http://user.kittyhawk.wtf:9082/metrics
- 一些技术指标,比如内存、进程、线程等
-
Connected Nodes PeerID's: http://user.kittyhawk.wtf:9082/nodes
- 连接的节点信息
3.2 使用
3.2.1 接入filecoin开发网络
- 初始化filecoin资源目录
如果之前有运行过filecoin,想重新开始,需要删除filecoin资源,同时重新初始化是需要重新花时间同步开发网区块信息的。
rm -rf ~/.filecoin
初始化资源目录,使用--devnet-user表示连接至开发网
waynewyang:Downloads waynewyang$ go-filecoin init --devnet-user --genesisfile=http://user.kittyhawk.wtf:8020/genesis.car
initializing filecoin node at ~/.filecoin
waynewyang:Downloads waynewyang$
- 启动filecoin进程,接入开发网
go-filecoin daemon
//如果开发者,需要接入nightly devnet,请设置环境变量后启动filecoin
env FIL_USE_SMALL_SECTORS=true go-filecoin daemon
- 检查连接性
go-filecoin swarm peers 查看已经连接的节点
waynewyang:filecoin waynewyang$ go-filecoin swarm peers
/ip4/115.238.154.84/tcp/19109/ipfs/Qmb6ZYi7GLFAje3UekGZ2LZymck7RVHKSKb1bhPzzPTQkm
/ip4/115.238.154.84/tcp/41187/ipfs/QmZ9UHdU2fwDN7emWW8AeaUdkF9fT7RwJrnbbdcQFUq9X6
/ip4/123.134.67.81/tcp/6000/ipfs/QmccrEQsauwge4BZQeN1jBtFyd7dnTi4pSDvkikMWaFccw
/ip4/123.134.67.82/tcp/6000/ipfs/QmWuA1AW4qDqztDrwo2pBgT2au67BJbGtEzWRufbc8isgn
/ip4/123.134.67.83/tcp/6000/ipfs/QmbPCabGcngs3bCgMK8dC3w9pjoyPd1NFyDhbkgLyT2eJ7
/ip4/123.134.67.85/tcp/6000/ipfs/QmUqSSZrwfSUU3vfw7D1UyKaLvEv1Ykcvx3ntvSXWaA7kj
/ip4/123.134.67.86/tcp/6000/ipfs/QmPrz2z764AVaHivM7iX2JqRw5EdE3jcZTrjwVxS4VukyK
/ip4/123.134.67.87/tcp/6000/ipfs/QmTxVFq3u7qPxsXFQdoyqPrdh6meW6JBGkSJ8HJXAiMUfh
/ip4/123.134.67.88/tcp/6000/ipfs/QmXAVRPYu57XDwJHszn9U9x1KtTwPsJBaS1mTdNZzAQVyQ
/ip4/123.134.67.89/tcp/6000/ipfs/Qmc5umx9R3bpD5VxvUmfyLoDz5wtVT43p5xjSEmTe26qTD
go-filecoin ping peerID 确认连通性
waynewyang:filecoin waynewyang$ go-filecoin ping QmW4Z8p7FCspLV1FeTRW6uCNApUXqkm8xYYw4yuBnqBGeB
PING <peer.ID Qm*nqBGeB>
Pong received: time=245.12 ms
Pong received: time=245.61 ms
Pong received: time=251.98 ms
Pong received: time=245.69 ms
Pong received: time=255.64 ms
- 给你的filecoin Node设置昵称
waynewyang:filecoin waynewyang$ go-filecoin config heartbeat.nickname "wwwarsyuncom"
"wwwarsyuncom"
waynewyang:filecoin waynewyang$ go-filecoin config heartbeat.nickname
"wwwarsyuncom"
- 激活节点
go-filecoin config heartbeat.beatTarget "/dns4/stats-infra.kittyhawk.wtf/tcp/8080/ipfs/QmUWmZnpZb6xFryNDeNU7KcJ1Af5oHy7fB9npU67sseEjR"
active.png在 https://stats.kittyhawk.wtf/ 查看filecoin网络,节点已经激活
3.2.2 获取Mock FIL用于测试
Mock FIL用于矿工抵押;或者作为客户进行交易需要
- 注意:开发网目前运行的都是全节点,获取mock FIL需要建立在本地区块数据同步完成的基础上进行,必须同步完区块之后才能生效,根据个人机器配置情况,这需要较长一段时间。
- go-filecoin message wait ${MESSAGE_CID} 本质上是转账交易,wiki上说明的是等待30s,但是这是在本地区块数据同步完成的基础上才行的。
- 笔者已提交建议给官方,在wiki上更为清晰地表述。
waynewyang:filecoin waynewyang$ go-filecoin wallet addrs ls
fcq09qtmrxgq5sdr95gs93tx79u9uymdwfdsaphpa
waynewyang:filecoin waynewyang$ export WALLET_ADDR=`go-filecoin wallet addrs ls`
waynewyang:filecoin waynewyang$ MESSAGE_CID=`curl -X POST -F "target=${WALLET_ADDR}" "http://user.kittyhawk.wtf:9797/tap" | cut -d" " -f4`
% Total % Received % Xferd Average Speed Time Time Time Current
Dload Upload Total Spent Left Speed
100 232 100 50 100 182 48 177 0:00:01 0:00:01 --:--:-- 177
waynewyang:go-filecoin waynewyang$ go-filecoin message wait ${MESSAGE_CID}
{
"meteredMessage": {
"message": {
"to": "fcqm0u932ja5thlsy4dgpz5urlapk8qhtd0clqv5e",
"from": "fcq09sqhrd4gls86muuenzvqdc37mzscagapjveal",
"nonce": "rQQ=",
"value": "1000",
"method": "",
"params": null
},
"gasPrice": "0",
"gasLimit": "AA=="
},
"signature": "WKA+eRY7XCQlSmallzoFu8Tps7NZ2AOAKLRFo21rTERFYJqXJT2qEWZ8sFvm6ZShR5syb7RSAJnDp4Am2Vzp0gE="
}
{
"exitCode": 0,
"return": null,
"gasAttoFIL": "0"
}
waynewyang:filecoin waynewyang$ go-filecoin wallet balance fcq09qtmrxgq5sdr95gs93tx79u9uymdwfdsaphpa
1000
waynewyang:filecoin waynewyang$ go-filecoin wallet balance ${WALLET_ADDR}
1000
3.2.3 矿工操作
3.2.3.1 存储矿工
- 创建存储矿工示例,需要等待1分钟左右
- 抵押10个扇区的存储空间(当前默认每个扇区256MiB)
- 支付100个FIL为担保
- gas价格为0
- 限制gas消耗最大为1000个FIL
waynewyang:filecoin waynewyang$ go-filecoin miner create 10 100 --price=0 --limit=1000 --peerid `go-filecoin id | jq -r '.ID'`
fcqjge872spqrgtm8dhlndjgfhhuxzx0y3ujvxxsl //所返回的就是矿工地址minerAddress
- 启动挖矿
waynewyang:filecoin waynewyang$ go-filecoin mining start
Started mining
- 收益之一: 启动挖矿之后就可以参与挖区块奖励
查询区块头
waynewyang:go-filecoin waynewyang$ go-filecoin chain head
[{"/":"zDPWYqFD2mBqLx7bwQNdeVoMxj6SC5HxzorZAoXpT6xjaythnENw"}]
查询具体区块信息
go-filecoin show block <blockID>
waynewyang:go-filecoin waynewyang$ go-filecoin show block zDPWYqFD2mBqLx7bwQNdeVoMxj6SC5HxzorZAoXpT6xjaythnENw
Block Details
Miner: fcq0y72meekgwnvchwml0uzx759q25nk0rqc47ret
Weight: 293567.552
Height: 10787
Nonce: 0
- 收益之二:创建报价单ask
1) 获取矿工地址
export MINER_ADDR=`go-filecoin config mining.minerAddress | tr -d \"`
2) 设置矿机Owner
export MINER_OWNER_ADDR=`go-filecoin miner owner $MINER_ADDR`
3) 创建报价单,价格0.000000001 FIL/byte/block, 交易费0,gas限制1000,提供2880个block空间存储
go-filecoin miner set-price --from=$MINER_OWNER_ADDR --miner=$MINER_ADDR --price=0 --limit=1000 0.000000001 2880 # output: CID of the ask
发布报价单,需要打包进去区块
waynewyang:filecoin waynewyang$ go-filecoin miner set-price --from=$MINER_OWNER_ADDR --miner=$MINER_ADDR --price=0 --limit=1000 0.000000001 15315
Set price for miner fcqjge872spqrgtm8dhlndjgfhhuxzx0y3ujvxxsl to 0.000000001.
Published ask, cid: zDPWYqFCxL3VW3xzmHhCBqPTvhoQa53pn6DzV3uY23jNL76za1Vt.
Ask confirmed on chain in block: zDPWYqFD7wjnj74sdB9HqupDmWmpPPEvygB14Pbo6rQC7ho2687D.
4) 查询区块信息(第三步中是zDPWYqFD7wjnj74sdB9HqupDmWmpPPEvygB14Pbo6rQC7ho2687D)可以找到对应报价单信息
waynewyang:filecoin waynewyang$ go-filecoin show block zDPWYqFD7wjnj74sdB9HqupDmWmpPPEvygB14Pbo6rQC7ho2687D --enc=json
{"miner":"fcqnam6n2qml2eyngws25srzvhcdf0t8gcgrsvnrk","ticket":"AM0p5IC9ph+o9dTwd/MXYdeOJW25PfDwhTgonNRkSP4=","parents":[{"/":"zDPWYqFCwNWHJXdeXcjx7ipUvRKFq5WhLbtSm6ESuNufkLuGiAgW"}],"parentWeight":"kujBrQE=","height":"2Hc=","nonce":"AA==","messages":[{"meteredMessage":{"message":{"to":"fcqp606qfk5gwmq6ac24g4mhv3cr8zzf67vqkpulh","from":"fcqr89lj0lvduj475zw002j6q5yrl30ks7uep2p5e","nonce":"Ag==","value":"215.6046624","method":"createChannel","params":"glYAABXMs4C0hXqcW94YGyVKxii6SLQhQ6HoAg=="},"gasPrice":"0","gasLimit":"rAI="},"signature":"vHzwO73TvM8MW1FKg8Qgfy/IP+wfJIQkEK0ExBB75gBbPMhv6GiU4aBq1T2Gb2OeMfrch8Zg3EFOJd0uUJltwAE="},{"meteredMessage":{"message":{"to":"fcqafmqgvzkzpvc6wjxecm7gsweuawjv8t6falk6r","from":"fcqr89lj0lvduj475zw002j6q5yrl30ks7uep2p5e","nonce":"Aw==","value":"100","method":"createMiner","params":"g0EKWEEEiA8ArEoyzhjWwijpTWYqDsOFfwxa2F0pUfOyRI/6yY28OD4QHcwUdb3a9omX9DNxVzdS2a8pWgiLNowe9wYVcFgiEiD3rKfg/NyDnrLF9IGxfp6U72jZxuniXlPcv5SG5OZHrA=="},"gasPrice":"0","gasLimit":"6Ac="},"signature":"/X/87zil8InOeLeQ6kqkqnpg7mP/e5jMaaVS4LRMIdYN84HTbABBpvt6quRqVQsadJnqOW7mn+6NA+2d9FDjPAA="},{"meteredMessage":{"message":{"to":"fcqp606qfk5gwmq6ac24g4mhv3cr8zzf67vqkpulh","from":"fcqmqr5f2a5qnwnvftpuzd6sjfy5tcq5dd0k24h85","nonce":"Ug==","value":"0.008596","method":"createChannel","params":"glYAAIVV3axUhfe7OGwwSH/IIONRcbinQ/OWAQ=="},"gasPrice":"0","gasLimit":"rAI="},"signature":"dxhSaVRvFBtdrbnEByza7a5JqLzm6n6rVZYGuFN6zegCTMDKbGGh++EvVmWo0WSbdcUo2vB/jFTgqzATh9+1NQA="},{"meteredMessage":{"message":{"to":"fcqugc6nql2eqglfwq0dw7ep7l9a07jacqgstely7","from":"fcq0nmdcq7updgwc3uh2lz2rnjms7gprdggcvxjqj","nonce":"BA==","value":null,"method":"commitSector","params":"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"},"gasPrice":"0","gasLimit":"rAI="},"signature":"hEluqbFG8TTSeeJyfOs10fZD/gOsrnFV8QgRAb4mhSFlzYpcijT9ye1yUYam5hcsW1eq1MFRfVGHhqYYUZ4LYwA="},{"meteredMessage":{"message":{"to":"fcqjge872spqrgtm8dhlndjgfhhuxzx0y3ujvxxsl","from":"fcqm0u932ja5thlsy4dgpz5urlapk8qhtd0clqv5e","nonce":"AQ==","value":"0","method":"addAsk","params":"gkWAlOvcA0I70w=="},"gasPrice":"0","gasLimit":"6Ac="},"signature":"IGUvf7CZ8lKDSTyzbg5kyArIPv8TIoFEWpA3ihRC7I86NFvgebCdEKQ6PqYhTJj1GQK/+JF28kCinXFN/9G8FgE="},{"meteredMessage":{"message":{"to":"fcqp606qfk5gwmq6ac24g4mhv3cr8zzf67vqkpulh","from":"fcqsvmdzpy5mjc9m0cuh6uhmprr6gk5w2zcrnjy02","nonce":"Aw==","value":"0.0000301989888","method":"createChannel","params":"glYAAGsLRe4dsJwsvfE2+dkEh1DPX11jQ+OdAQ=="},"gasPrice":"0","gasLimit":"rAI="},"signature":"Zg5kUOtEZ9Um+mGKicHaqTCaORppGv5KAaSlTpN/qTcoTptRUP3ZbQ5YOL7zjTG6aF7Y4r0Ck0NsnG0J/i2B0AA="},{"meteredMessage":{"message":{"to":"fcqp606qfk5gwmq6ac24g4mhv3cr8zzf67vqkpulh","from":"fcqrqtfcug5hlx7gugvwj0f2dyx6j9cxdn0ynmpu3","nonce":"Ag==","value":"0","method":"createChannel","params":"glYAAJsQ6e5i/M0X04YZwzl3VWckPu4RQ62HAQ=="},"gasPrice":"0","gasLimit":"rAI="},"signature":"oisXV83sTFkJw7y5KbO5fLhx2oa48qZKAVwX+1fIvWUDgm5PQNDddPeCkklPg2L+fmp4wL2fLF9R2qPRciLUfAA="}],"stateRoot":{"/":"zdpuAvwpuqNR4J6PJDqGfF5GbyjWarD1BhujTUfyREMHSY1eF"},"messageReceipts":[{"exitCode":0,"return":["Ag=="],"gasAttoFIL":"0"},{"exitCode":0,"return":["AAA2Qrupiubk6ljOMnMUrnnHKaVXmQ=="],"gasAttoFIL":"0"},{"exitCode":0,"return":["0gA="],"gasAttoFIL":"0"},{"exitCode":0,"return":null,"gasAttoFIL":"0"},{"exitCode":0,"return":[""],"gasAttoFIL":"0"},{"exitCode":0,"return":["Aw=="],"gasAttoFIL":"0"},{"exitCode":0,"return":["Ag=="],"gasAttoFIL":"0"}],"proof":[177,165,90,219,1,18,240,190,113,56,243,22,167,201,232,75,124,152,130,111,74,132,5,192,33,191,102,220,102,9,99,109,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]}
//查询最新区块信息
waynewyang:go-filecoin waynewyang$ go-filecoin show block `go-filecoin chain head --repodir=~/.filecoin2/ |jq -r '.[0]'|jq -r '.["/"]'`
Block Details
Miner: fcq973y2y7hvcce8zkwds7r2847xmfjvdecn98lws
Weight: 134386.836
Height: 5013
Nonce: 0
5) 获取所有矿工的报价信息
go-filecoin client list-asks --enc=json | jq
现在默认是只要客户出价高于矿工报价,默认接受交易。
- 停止挖矿
go-filecoin mining stop
rm -rf ~/.filecoin //删除filecoin矿工实例,区块同步也被删除,再次实例化,需要再次同步区块
3.2.3.2 检索矿工
暂未发现支持,目前可以自己的供应商(具体矿工)处获取;后面通过更深入的分析之后另行补充。
3.2.3.3 修复矿工
修复矿工的概念是白皮书之后提出的,后面继续深入分析之后再另行补充。
3.2.4 客户操作
3.2.4.1 存储客户
- filecoin 与IPFS数据结构是兼容的
//创建测试文件
waynewyang:test waynewyang$ echo "Hi my name is $USER"> hello.txt
waynewyang:test waynewyang$ cat hello.txt
Hi my name is waynewyang
//导入filecoin本地资源库
waynewyang:test waynewyang$ export CID=`go-filecoin client import ./hello.txt`
waynewyang:test waynewyang$ echo $CID
Qmchgh3N3kxWiaZ2cp9PbV93i77H3K8KtQCBTeVR5Q7wzs
//这里会发现用IPFS上传得到的CID也是一样
waynewyang:test waynewyang$ ipfs add hello.txt
added Qmchgh3N3kxWiaZ2cp9PbV93i77H3K8KtQCBTeVR5Q7wzs hello.txt
25 B / 25 B [========================================================================] 100.00%
//用go-filecoin或者IPFS命令获取数据,结果一致
waynewyang:test waynewyang$ go-filecoin client cat $CID
Hi my name is waynewyang
waynewyang:test waynewyang$ ipfs block get $CID
Hi my name is waynewyang
- 导入测试数据
waynewyang:sample-data waynewyang$ export CID=`go-filecoin client import camel.jpg`
waynewyang:sample-data waynewyang$ go-filecoin client cat $CID > image.png && open image.png
waynewyang:sample-data waynewyang$ echo $CID
QmeubcGKFXpafFT4xRFGf3NqDRzJUVoAqe5sh1ugbRPZ7u
- 查询矿工的报价单
waynewyang:sample-data waynewyang$ go-filecoin client list-asks --enc=json | jq
{
"Miner": "fcqvnwlanfu7ecflnp3rc5gm0ecdamvxgvlawref4",
"Price": "0.000000001",
"Expiry": 7079,
"ID": 0,
"Error": null
}
{
"Miner": "fcqsmut6jnwchq0qlc3t6v44pzgf8l49lg6r8wl4a",
"Price": "0.000000001",
"Expiry": 16522,
"ID": 0,
"Error": null
}
{
"Miner": "fcqsmut6jnwchq0qlc3t6v44pzgf8l49lg6r8wl4a",
"Price": "0.000000000000000001",
"Expiry": 18753,
"ID": 1,
"Error": null
}
{
"Miner": "fcqghrce7vaf6czj54x5qke0mn2uzzg8ckvgvcjpe",
"Price": "0.000000001",
"Expiry": 14404,
"ID": 0,
"Error": null
}
......
- 下单
go-filecoin client propose-storage-deal <miner> <data> <ask> <duration>
<miner> address of the miner from list-asks
<data> CID of the imported data that you want to store
<ask> ID of the ask, also from list-asks (usually 0)
<duration> how long you want to store (in # of ~30sec blocks). For example, storing for 1 day (2 blocks/min * 60 min/hr * 24 hr/day) = 2880 blocks.
- 发送数据和支付
1 支付
1)支付到paych中
2)定期向矿工付款
2 数据
1)未密封完的数据称之为暂存区
2)密封完成后阶段性支付
3.2.4.2 检索客户
现在是指定所对应的存储矿工进行检索,暂未发现更多支持,在后面的深入分析中会继续跟进。
- 查询订单状态,必须是密封,posted交易结束后才能查询
go-filecoin client query-storage-deal < dealID >
- 检索
go-filecoin retrieval-client retrieve-piece < minerAddress > < CID >
3.2.5 filecoin合约
3.2.5.1 文件合约
其实现在的创建存储矿工,以及矿工创建报价、存储客户提交订单存储,这些笔者认为属于filecoin文件合约的范畴。
与以太坊类似,以太坊抽象出了代币合约以及通用智能合约; 而filecoin则是抽象出了文件合约和通用智能合约。
3.2.5.2 智能合约
暂未发现支持通用智能合约,在后面的深入分析中会继续跟进。
3.2.6 单机运行多个filecoin节点
3.2.6.1 修改资源目录和服务端口的方式
-
go-filecoin init的时候,通过 ‘--repodir=所指定资源目录路径’ 命令进行初始化目录资源,后面的其他命令同样需要所指定资源目录路径进行操作。
-
修改资源目录下的config.json文件,将默认的端口予以修改,避免与另外的本机实例相冲突。
3.2.6.2 容器部署方式
- 可以打包成docker镜像,有兴趣的朋友可以自行尝试。
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