Ethereum-Solidity

Links

https://blog.karatos.in/a?ID=00650-84dbdbaa-ec48-45cb-9944-cd41139fd3b2

https://www.quicknode.com/guides/web3-sdks/how-to-connect-to-ethereum-network-with-web3-js

https://www.youtube.com/watch?v=49KK8MbMggQ

https://medium.com/@rktkek456/build-private-ethereum-network-and-test-step-by-step-ff50a2c88eca

https://github.com/fridays/next-routes

https://medium.com/@martinparmar.ce/part-1-blockchain-network-go-ethereum-70b5d15181d2

https://geth.ethereum.org/docs/interface/javascript-console

Dependencies

npm i --save @truffle/hdwallet-provider @truffle/hdwallet-provider fs-extra ganache-cli mocha solc@0.4.25 web3

npm install mocha-steps --save-dev

npm i next react react-dom

npm i --save semantic-ui-react

npm install --save semantic-ui-css

npm install next-routes --legacy-peer-deps

npm run dev

##To attach to a running geth instance

geth attach

OR

geth attach ipc:/Users/Elimane/Library/Ethereum/geth.ipc

To create an account in geth

personal.newAccount()

List all accounts into the local network

eth.accounts
personal.listAccounts

Convert balance from wei to ether

web3.fromWei(eth.getBalance(eth.accounts[0]),"ether")

Check crypto balance

web3.eth.getBalance(eth.accounts[0])

Mine ether on my private network

miner
miner.setEtherbase(eth.accounts[0])
miner.start(1) <- 1 is one thread miner.stop() <- 1 is one thread

Create new local network with geth, we need to be into directory containing genesis.json file and execute cmd

geth init ./genesis.json --datadir mychaindata

Create Nodes 1 and 2

geth init ./genesis.json --datadir mychaindata/node1
geth init ./genesis.json --datadir mychaindata/node2
geth init ./genesis.json --datadir mychaindata/node3

Get info on nodes

admin.nodeInfo

Launch nodes by specifying ports

geth --datadir nodes/node1/ --port 30303 --nodiscover --networkid 1234
geth --datadir nodes/node2/ --port 30304 --nodiscover --networkid 1234
geth --datadir nodes/node3/ --port 30304 --nodiscover --networkid 1234

Launch nodes in http mode

geth --datadir mychaindata/node1/ --syncmode full --nodiscover --port 30304 --http.addr 0.0.0.0 --networkid 1234

geth --datadir mychaindata/node2/ --syncmode full --nodiscover --port 30305 --http.addr 0.0.0.0 --networkid 1234

geth --datadir mychaindata/node3/ --syncmode full --nodiscover --port 30306 --http.addr 0.0.0.0 --networkid 1234

OR via HTTP we can launch nodes

geth --datadir mychaindata/node1/ --syncmode full --port 30304 --http --http.addr localhost --http.port 8546 --http.api admin,personal,eth,net,web3,txpool,miner --networkid 99 --identity node1 console --ipcdisable --allow-insecure-unlock

geth --datadir mychaindata/node2/ --syncmode full --port 30305 --http --http.addr localhost --http.port 8547 --http.api admin,personal,eth,net,web3,txpool,miner --networkid 99 --identity node2 console --ipcdisable --allow-insecure-unlock

geth --datadir mychaindata/node1/ --syncmode full --port 30306 --http --http.addr “localhost” --http.port 8548 --http.api personal,eth,net,web3,txpool,miner --networkid 99 --identity node3 console --ipcdisable --allow-insecure-unlock

OR via Websocket we can launch nodes

geth --datadir mychaindata/node1/ --syncmode full --port 30304 --ws --ws.addr localhost --ws.port 8546 --ws.api admin,personal,eth,net,web3,txpool,miner --ws.origins "*" --networkid 99 --identity node1 console --ipcdisable --allow-insecure-unlock

geth --datadir mychaindata/node2/ --syncmode full --port 30305 --ws --ws.addr localhost --ws.port 8547 --ws.api admin,personal,eth,net,web3,txpool,miner --networkid 99 --identity node2 console --ipcdisable --allow-insecure-unlock

geth --datadir mychaindata/node1/ --syncmode full --port 30306 --http --http.addr “localhost” --http.port 8548 --http.api personal,eth,net,web3,txpool,miner --networkid 99 --identity node3 console --ipcdisable --allow-insecure-unlock

URLS for attachment

"/Users/Elimane/SUPINFO2022/Blockchain/Practice/My Projects/5BLOC/network/mychaindata/node1/geth.ipc"

"/Users/Elimane/SUPINFO2022/Blockchain/Practice/My Projects/5BLOC/network/mychaindata/node2/geth.ipc"

GETH Attachment

geth attach ipc:"/Users/Elimane/SUPINFO2022/Blockchain/Practice/My Projects/5BLOC/network/mychaindata/node1/geth.ipc"

geth attach ipc:"/Users/Elimane/SUPINFO2022/Blockchain/Practice/My Projects/5BLOC/network/mychaindata/node2/geth.ipc"

geth attach ipc:"/Users/Elimane/SUPINFO2022/Blockchain/Practice/My Projects/5BLOC/network/mychaindata/node3/geth.ipc"

OR via HTTP attachment

geth attach http://127.0.0.1:8546

geth attach http://127.0.0.1:8547

geth attach http://127.0.0.1:8548

OR via webSocket attachment

geth attach ws://127.0.0.1:8546

geth attach ws://127.0.0.1:8547

geth attach ws://127.0.0.1:8548

Check if there is peers in the network meaning if nodes are tied to each other

admin.peers

Add Peer in node 1 with enode of node 2 , will make a peer relationship between 1 and node 2

admin.addPeer("enode://6c922cb3d9fba3a6e3c8327e122cd4d06f3ee533ab5a8277d83b8dd66cd3a91d37b3905c859c976d31f0f4fe23ac01ba83a9badc2c7371d4de23c02bcd2ec9ac@90.39.252.243:30304?discport=0")

NO DISCOVER because sometimes Geth will discover other nodes with The same ID

geth --datadir ./mychaindata/ --nodiscover ##OR geth --datadir ./mychaindata/ --nodiscover --unlock 0 --mine --miner.threads 1

Key commands from the javascript console

Personal.newAccount()
(add password)

Start mining with one thread

miner.start(1)

Stop mining

miner.stop()

ADD Ethers to an account

miner.setEtherbase(eth.accounts[0])

miner.getHashrate()

- current block height

eth.blockNumber

##- miner of block at that number

eth.getBlock(number).miner

- current balance of that account

eth.getBalance(account address)

##- Unlock account

personal.unlockAccount(personal.listAccounts[0],"", 15000)
personal.unlockAccount(personal.listAccounts[1],"", 15000)
personal.unlockAccount(personal.listAccounts[2],"", 15000)
personal.unlockAccount(personal.listAccounts[3],"", 15000)
personal.unlockAccount(personal.listAccounts[4],"", 15000)

##- Get an account from local ethereum network

eth.getBalance(personal.listAccounts[0])

Start Front end server

npm run dev

Removes an account from the wallet.

web3.eth.accounts.wallet.remove(account);