golang go-ethereum contract string to [32]byte

func covertStringByte32(t string) [32]byte {
 var b32 [32]byte
 copy(b32[:], []byte(t))
 return b32
}

func covertStringByte64(t string) [64]byte {
 var b64 [64]byte
 copy(b64[:], []byte(t))
 return b64
}

golang test e2e

httpexpect star 1159
https://github.com/gavv/httpexpect
https://github.com/gavv/httpexpect/blob/master/_examples/echo_test.go


goconvey
https://segmentfault.com/a/1190000014924022
https://github.com/smartystreets/goconvey/

baloo star 652
https://github.com/h2non/baloo

frisby star 249
https://github.com/verdverm/frisby

apitest star 121
https://github.com/steinfletcher/apitest

[轉]通过 Channel 实现 Goroutine Pool

https://segmentfault.com/a/1190000020185565

[轉]Go学习之Channel总结

https://segmentfault.com/a/1190000020086749

go mod custome model

https://stackoverflow.com/questions/52079662/go-get-cannot-find-local-packages-when-using-multiple-modules-in-a-repo

api/contracts/contract.go

package contracts

import (
 "math/big"
 "strings"
)....

func DeployContract(...)

api/contract.go

package main

import (
 "api/contracts"
...)

func deployContract(c echo.Context) error {
         address, tx, token, err := contracts.DeployContract(auth, client)
...
}

! Best Import is api/go.mod

module api

require (
         api/contracts v0.0.0
...)

replace (
         api/contracts v0.0.0 => ./contracts
...)

And api/contracts/go.mod

module api/contracts

require (
...)

solc abigen docker

sol file put in ~/contracts/sol

File list

~/contracts/sol/Contracts.sol

RUN

docker run -v ~/contracts:/sources ethereum/solc:0.4.23 -o /sources --abi --bin /sources/sol/Contract.sol

File list

~/contracts/sol/Contracts.sol
~/contracts/Contracts.abi
~/contracts/Contracts.bin

1. 0.4.23 check your contract version. This example is pragma solidity ^0.4.23;
2. sol name need be changeed. This example is Contract.sol
3. Permission denied just use root

RUN

docker run -v ~/contracts:/sources ethereum/client-go:alltools-v1.9.2 abigen --abi /sources/Contract.abi --pkg contracts --type Contract --out /sources/Contract.go  --bin /sources/Contract.bin

File list

~/contracts/sol/Contracts.sol
~/contracts/Contracts.abi
~/contracts/Contracts.bin
~/contracts/Contracts.go

1. Contract.abi Contract.go must change by solc output
2. pkg is go source code：package contracts
3. type is go source code：type Cert struct { }
4. bin is go source code：be add "var ContractBin = ..." and "func DeployContract(..."

Error：

docker run -v ~/contracts/sol:/sources ethereum/client-go:alltools-v1.9.2 abigen --sol /sources/Cert.sol --pkg contracts --out /sources/Cert.go

Fatal: Failed to build Solidity contract: exec: "solc": executable file not found in $PATH


Source：
https://solidity.readthedocs.io/en/develop/installing-solidity.html#docker
https://github.com/ethereum/go-ethereum/wiki/Native-DApps:-Go-bindings-to-Ethereum-contracts#generating-the-bindings
https://hub.docker.com/r/ethereum/client-go

https://github.com/ethereum/go-ethereum/blob/master/cmd/abigen/main.go

go-eth

https://medium.com/taipei-ethereum-meetup/%E4%BD%BF%E7%94%A8-go-%E8%88%87%E4%BB%A5%E5%A4%AA%E5%9D%8A%E5%8D%80%E5%A1%8A%E9%8F%88%E4%BA%92%E5%8B%95-%E4%B8%89-7b7b1f40c06a

https://github.com/sc0Vu/go-eth