[ethereum] block, transaction pool, state 각각 어디에 저장되는가

thereum에서 block, transaction pool, state가 어디에 저장되는지 알아보도록 하겠습니다.

먼저 block, state는 levelDB를 통해 저장이 됩니다. 근데 문득 그렇다면 transaction이 발생되고 pool에 저장된 tx들은 어디에 저장되는지 궁금해져서 테스트를 해보았습니다.

· 2개의 account 생성

> eth.accounts
["0xe28674672b353d2d4c80435b610734e68bcd4362", "0xbd83f6767a57da0c25b1437660adf43c3e1667be"]

> eth.getBalance(eth.accounts[0])
75000000030000000000

> eth.getBalance(eth.accounts[1])
0

2개의 account를 생성한 후 transaction을 발생시킨 후 geth 프로그램을 종료했다가 다시 접속하여 tx pool을 확인해 보겠습니다.

· tx 발생하기 전 tx pool 확인

> eth.pendingTransactions
[]

tx를 발생시키지 않았기 때문에 비어있습니다.

· tx 발생

> personal.unlockAccount(eth.accounts[0], "p")
true

> eth.sendTransaction({from: eth.accounts[0], to: eth.accounts[1], value: 10000})
INFO [09-16|09:42:52] Submitted transaction                    fullhash=0x8360bedc21d02cd2c00e5dbc485949f6fee7cf3470e7bd94fe477d86c2152eff recipient=0xbd83f6767a57da0c25b1437660adf43c3e1667be
"0x8360bedc21d02cd2c00e5dbc485949f6fee7cf3470e7bd94fe477d86c2152eff"

geth에서는 account에 lock이 되있기 때문에 unlockAccount로 계정잠금을 풀어줘야 합니다.

· tx pool 확인

> eth.pendingTransactions
[{
    blockHash: null,
    blockNumber: null,
    from: "0xe28674672b353d2d4c80435b610734e68bcd4362",
    gas: 90000,
    gasPrice: 18000000000,
    hash: "0x8360bedc21d02cd2c00e5dbc485949f6fee7cf3470e7bd94fe477d86c2152eff",
    input: "0x",
    nonce: 0,
    r: "0x18e91ac9e352aa1353b31a4d544191e310a8fae75a1e8a63058a108a64c4f7b9",
    s: "0x55c4028befc7fdc02e0b3b0230f7873ea017effd37b5e1a0a0aba93a2619fe93",
    to: "0xbd83f6767a57da0c25b1437660adf43c3e1667be",
    transactionIndex: 0,
    v: "0x5cd84",
    value: 10000
}]

peding 중인 tx를 확인하니 방금 발생한 tx가 들어있습니다.

여기서 geth 프로그램을 종료한 후 pending을 확인하면 메모리에 저장되는지 db에 저장되는지 알 수 있습니다.

· geth 프로그램 종료

> exit
INFO [09-16|09:44:42] HTTP endpoint closed: http://0.0.0.0:8545
INFO [09-16|09:44:42] IPC endpoint closed: /Users/bagjeongtae/Desktop/geth_test/geth.ipc
INFO [09-16|09:44:42] Blockchain manager stopped
INFO [09-16|09:44:42] Stopping Ethereum protocol
INFO [09-16|09:44:42] Ethereum protocol stopped
INFO [09-16|09:44:42] Transaction pool stopped
INFO [09-16|09:44:42] Database closed                          database=/Users/bagjeongtae/Desktop/geth_test/geth/chaindata

· geth 프로그램 다시시작

$ vim start.sh
geth --networkid 1212121212 --maxpeers 3 --datadir $PWD --rpc --rpcport 8545 --rpcaddr "0.0.0.0" --rpccorsdomain "*" --rpcapi "admin,db,eth,debug,miner,net,shh,txpool,personal,web3" --port 30303 console

geth 시작명령어가 길기 때문에 매번치기 힘드므로 쉘 스크립트로 저장합니다. 머 물론 그냥 터미널에 복붙해도 됩니다.

$ ./start.sh
INFO [09-16|09:45:18] Starting peer-to-peer node               instance=Geth/v1.6.7-stable-ab5646c5/darwin-amd64/go1.9
INFO [09-16|09:45:18] Allocated cache and file handles         database=/Users/bagjeongtae/Desktop/geth_test/geth/chaindata cache=128 handles=1024
INFO [09-16|09:45:18] Initialised chain configuration          config="{ChainID: 190128 Homestead: 0 DAO: <nil> DAOSupport: false EIP150: <nil> EIP155: 0 EIP158: 0 Metropolis: <nil> Engine: unknown}"
INFO [09-16|09:45:18] Disk storage enabled for ethash caches   dir=/Users/bagjeongtae/Desktop/geth_test/geth/ethash count=3
INFO [09-16|09:45:18] Disk storage enabled for ethash DAGs     dir=/Users/bagjeongtae/.ethash                       count=2
INFO [09-16|09:45:18] Initialising Ethereum protocol           versions="[63 62]" network=1212121212
INFO [09-16|09:45:18] Loaded most recent local header          number=15 hash=8f3b47…271944 td=2103872
INFO [09-16|09:45:18] Loaded most recent local full block      number=15 hash=8f3b47…271944 td=2103872
INFO [09-16|09:45:18] Loaded most recent local fast block      number=15 hash=8f3b47…271944 td=2103872
WARN [09-16|09:45:18] Blockchain not empty, fast sync disabled
INFO [09-16|09:45:18] Starting P2P networking
INFO [09-16|09:45:20] Mapped network port                      proto=udp extport=30303 intport=30303 interface="UPNP IGDv2-IP1"
INFO [09-16|09:45:20] UDP listener up                          self=enode://d87594294e7e926cbc6de95361461550f5f7b726eeb93e7c609cb8bed0132296ef7f547c1f4284db1de8c3bc471688e0722d373aa882d0f43fdec427d5b4cc3c@121.161.16.47:30303
INFO [09-16|09:45:20] RLPx listener up                         self=enode://d87594294e7e926cbc6de95361461550f5f7b726eeb93e7c609cb8bed0132296ef7f547c1f4284db1de8c3bc471688e0722d373aa882d0f43fdec427d5b4cc3c@121.161.16.47:30303
INFO [09-16|09:45:20] IPC endpoint opened: /Users/bagjeongtae/Desktop/geth_test/geth.ipc
INFO [09-16|09:45:20] HTTP endpoint opened: http://0.0.0.0:8545
INFO [09-16|09:45:20] Mapped network port                      proto=tcp extport=30303 intport=30303 interface="UPNP IGDv2-IP1"
Welcome to the Geth JavaScript console!

instance: Geth/v1.6.7-stable-ab5646c5/darwin-amd64/go1.9
coinbase: 0xe28674672b353d2d4c80435b610734e68bcd4362
at block: 15 (Sun, 16 Sep 2018 09:34:51 KST)
 datadir: /Users/bagjeongtae/Desktop/geth_test
 modules: admin:1.0 debug:1.0 eth:1.0 miner:1.0 net:1.0 personal:1.0 rpc:1.0 txpool:1.0 web3:1.0

>

· tx pool 확인

> eth.pendingTransactions
[]

프로그램을 다시 시작하니 pending이 비어있습니다. 이것은 해당 데이터는 메모리에 저장된다는 의미입니다.

· tx pool 직접확인

 

> txpool
{
  content: {
    pending: {
      0xe28674672b353d2d4c80435b610734e68bcd4362: {
        0: {...}
      }
    },
    queued: {}
  },
  inspect: {
    pending: {
      0xe28674672b353d2d4c80435b610734e68bcd4362: {
        0: "0xbd83f6767a57da0c25b1437660adf43c3e1667be: 10000 wei + 90000 × 18000000000 gas"
      }
    },
    queued: {}
  },
  status: {
    pending: 1,
    queued: 0
  },
  getContent: function(callback),
  getInspect: function(callback),
  getStatus: function(callback)
}

txpool을 이용하면 좀 더 자세히 확인할 수 있습니다.