一、配置编译环境

安装golang

$ brew install golang

输入go env 查看环境变量,通过go get 安装的工程都会放到$GOPATH 目录下。

$ go env
GOARCH="amd64"
GOBIN=""
GOCACHE="/Users/ff/Library/Caches/go-build"
GOEXE=""
GOFLAGS=""
GOHOSTARCH="amd64"
GOHOSTOS="darwin"
GOOS="darwin"
GOPATH="/Users/ff/go"
GOPROXY=""
GORACE=""
GOROOT="/usr/local/Cellar/go/1.12.6/libexec"
GOTMPDIR=""
GOTOOLDIR="/usr/local/Cellar/go/1.12.6/libexec/pkg/tool/darwin_amd64"
GCCGO="gccgo"
CC="clang"
CXX="clang++"
CGO_ENABLED="1"
GOMOD=""
CGO_CFLAGS="-g -O2"
CGO_CPPFLAGS=""
CGO_CXXFLAGS="-g -O2"
CGO_FFLAGS="-g -O2"
CGO_LDFLAGS="-g -O2"
PKG_CONFIG="pkg-config"
GOGCCFLAGS="-fPIC -m64 -pthread -fno-caret-diagnostics -Qunused-arguments -fmessage-length=0 -fdebug-prefix-map=/var/folders/cw/h48n_7rj541gmtr9thyyvp_w0000gn/T/go-build747874846=/tmp/go-build -gno-record-gcc-switches -fno-common"

安装go 调试器delve

$ go get github.com/derekparker/delve

安装xcode

$ xcode-select --install

二、下载编译geth

clone 代码

$ git clone https://github.com/ethereum/go-ethereum.git

执行编译命令,工程根目录下生成geth

$ cd /Users/ff/go/src/github.com/ethereum/go-ethereum
$ go build ./cmd/geth

三、配置私有链

创建创世文件genesis.json,并初始化节点

{
 "config": {
 "chainId": 0,
 "homesteadBlock": 0,
 "eip155Block": 0,
 "eip158Block": 0
 },
 "alloc": {},
 "coinbase": "0x0000000000000000000000000000000000000000",
 "difficulty": "0x20000",
 "extraData": "",
 "gasLimit": "0x2fefd8",
 "nonce": "0x0000000000000042",
 "mixhash": "0x0000000000000000000000000000000000000000000000000000000000000000",
 "parentHash": "0x0000000000000000000000000000000000000000000000000000000000000000",
 "timestamp": "0x00"
}

$ ./geth --datadir geth-data0 init ewasm-testnet-geth-config.json

创建两个账户

$ ./geth --datadir geth-data0 account new
$ ./geth --datadir geth-data0 account new

启动节点

$ ./geth \
--datadir geth-data0
--networkid 66 \
--nodiscover \
--rpcport 6001 \
--port 3001 \
--ipcpath geth1.ipc console

attach 节点,后续操作略......

$ ./geth attach ipc:geth-data0/geth1.ipc

四、配置vs code

安装插件"Go",并配置launch.json

{
 "version": "0.2.0",
 "configurations": [
 {
 "name": "Launch",
 "type": "go",
 "request": "launch",
 "mode": "auto",
 "program": "${workspaceFolder}/cmd/geth",
 "args": ["--datadir",
 "/Users/ff/go/src/github.com/ethereum/go-ethereum/geth-data0",
 "--networkid",
 "66",
 "--nodiscover",
 "--rpcport",
 "6001",
 "--port",
 "30001",
 "--ipcpath",
 "geth1.ipc",
 "console"],
 "stopAtEntry": false,
 "cwd": "${workspaceFolder}",
 "environment": [],
 "externalConsole": true,
 "MIMode": "lldb"
 }
 ]
}

找到./internal/ethapi/api.go,搜索"Accounts()",然后在该函数中设置断点。
选择Debug > Start Debugging,或直接用快捷键F5,进入debug 模式。
启动完毕后,启动一个命令行窗口attach 该节点。输入eth.accounts查看当前节点账户,即可到达Accounts() 函数中设置的断点处。

$ ./geth attach ipc:geth-data0/geth1.ipc
INFO [08-07|17:56:21.466] Bumping default cache on mainnet provided=1024 updated=4096
Welcome to the Geth JavaScript console!
instance: Geth/v1.9.2-unstable/darwin-amd64/go1.12.6
coinbase: 0x2d636f052802a791a4114036d2c5f91cf4549539
at block: 0 (2018年8月20日 05:16:36 CST)
 datadir: /Users/ff/go/src/github.com/ethereum/go-ethereum/geth-data0
 modules: admin:1.0 debug:1.0 eth:1.0 ethash:1.0 miner:1.0 net:1.0 personal:1.0 rpc:1.0 txpool:1.0 web3:1.0
> eth.accounts
["0x2d636f052802a791a4114036d2c5f91cf4549539", "0xc5bff4b89d965e00a94827d12ccd8cc70b5e30a5"]
>

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