demo: add evm chain bridge and faucet

[imotai]

Smart Contract

• db3 erc20 token contract
• deposit db3 to rollup contract
• faucet

Bridge Node

• watch the deposit events from rollup contract
• add mint credit mutation
• process message and submit mint mutation
• fund faucet

Demo

step1 start all network

cd tools && bash start_localnet.sh
tendermint: no process found
BUILD MODE: debug
tendermint exist
db3: no process found
ganache: no process found
start db3 node...
start tendermint node...
start evm chain network...
deploy rollup contract to evm chain
rollup address 0xe2dDD568DB4d28bD79787D0a3e50d0E10E461EA4
erc20 address 0x7b68E10c80474DD93bD8C1ad53D4463c60a3AB7c
start db3 bridge node ...
start db3 faucet node ...
start local development done!

step2 fund the faucet

cd tools && cat faucet.log
023-02-22T13:07:37.818160Z  INFO db3_node::command: 
2023-02-22T13:07:37.828325Z  INFO db3_faucet::faucet_node_impl: new faucet node  with config FaucetNodeConfig { erc20_address: "0x7b68E10c80474DD93bD8C1ad53D4463c60a3AB7c", node_list: ["ws://127.0.0.1:8545"], amount: 1000000000 } and faucet evm address 0x90167babec369a1e1b62107da9a99a50db2351a2

/target/debug/db3 fund-faucet  --evm-chain-ws ws://127.0.0.1:8545 --private-key ad689d9b7751da07b0fb39c5091672cbfe50f59131db015f8a0e76c9790a6fcc --faucet-address 0x90167babec369a1e1b62107da9a99a50db2351a2 --erc20-address 0x7b68E10c80474DD93bD8C1ad53D4463c60a3AB7c

step3 request the faucet

./target/debug/db3 console
db3>-$ faucet
 message 
----------------------------------
 send faucet request successfully 
db3>-$ show-evm-account --evm-chain-ws ws://127.0.0.1:8545 --token-address 0x7b68E10c80474DD93bD8C1ad53D4463c60a3AB7c --contract-address 0xe2dDD568DB4d28bD79787D0a3e50d0E10E461EA4
 name           | value 
----------------+--------------------------------------------
 address        | 0xd710618058b35da3ffd5c57e1bb29c9f90522479 
 locked balance | 0.000000 db3 
 balance        | 1.000000 db3 
 locked balance | 0.000000 db3

you will get 1 $db3

step4 deposit to db3 rollup contract

deposit --evm-chain-ws ws://127.0.0.1:8545 --token-address 0x7b68E10c80474DD93bD8C1ad53D4463c60a3AB7c --contract-address 0xe2dDD568DB4d28bD79787D0a3e50d0E10E461EA4 --amount 0.5
 message 
-------------------------------------------
 deposit fund to db3 contract successfully 
db3>-$ show-account
 name           | value 
----------------+--------------------------------------------
 db3 address    | 0x539a6192e4fcd61f53772a3284c7734bc0f6f1d6 
 evm address    | 0xd710618058b35da3ffd5c57e1bb29c9f90522479 
 bills          | 0.000000 db3 
 credits        | 0.500000 db3 
 storage used   | 0.00  
 mutation count | 0 
 session count  | 0 
 nonce          | 0 

Now you can see 0.5 $db3 credits in the db3 network and you can be free to store and query documents

Some Best Practice

• https://consensys.github.io/smart-contract-best-practices/development-recommendations/general/external-calls/
• https://eips.ethereum.org/EIPS/eip-712

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Codecov Report

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