kratosL 01

1. 環境變數：/etc/profile或其他檔案

export GOROOT=/usr/local/go

export GOPATH=$HOME/golang

export PATH=$PATH:/usr/local/go/bin:$GOPATH/bin:$HOME/bin/protoc

export GOPROXY=https://goproxy.cn

export GO111MODULE=on

2. 建golang目錄

# mkdir $HOME/golang

# mkdir $HOME/golang/src

# mkdir $HOME/golang/pkg

# mkdir $HOME/golang/bin

3. 下載golang

https://studygolang.com/dl

# tar -xf xx -C /usr/local/

4. 安裝protoc

原始碼地址：https://github.com/protocolbuffers/protobuf/releases

下載3.14版本

# curl -L https://github.com/protocolbuffers/protobuf/releases/download/v3.14.0/protoc-3.14.0-linux-x86_64.zip -o protoc-3.14.0-linux-x86_64.zip

# mkdir protoc

# mv protoc-3.14.0-linux-x86_64.zip protoc/

# yum install unzip -y

# cd protoc

# unzip protoc-3.14.0-linux-x86_64.zip

# cp bin/protoc $GOPATH/bin/

# cp -r include/google $HOME/src/

5. 需要gcc

# yum install gcc -y

6. 快速開始

https://go-kratos.dev/#/quickstart

# go get -u github.com/go-kratos/kratos/tool/kratos

不用到$GOPATH目錄，使用go module，隨便創建一個目錄即可:

# mkdir kratosL && cd kratos

新建app:

# kratos new app01

初始化go module:

# go mod init kratosL

自動獲取依賴:

# go mod tidy

運行：

# cd app01/cmd 

# go build 

# ./cmd -conf ../configs

如下地址：

http://172.20.42.54:8000/app01/start

瀏覽器回傳：

{"code":0,"message":"0","ttl":1,"data":{"Hello":"Golang 大法好 !!!"}}

問題1：執行 kratos new app01

kratos tool protoc --grpc --bm api.proto

2020/12/29 16:07:29 protoc --proto_path=/root/golang/src --proto_path=/root/golang/pkg/mod/github.com/go-kratos/kratos@v0.6.1-0.20201222142230-f9d8abbcc47a/third_party --proto_path=/root/kratosL/app01/api --bm_out=:. api.proto

api.proto: File does not reside within any path specified using --proto_path (or -I). You must specify a --proto_path which encompasses this file. Note that the proto_path must be an exact prefix of the .proto file names -- protoc is too dumb to figure out when two paths (e.g. absolute and relative) are equivalent (it's harder than you think).

解決：protoc版本過低

問題2：安裝gcc時報錯

錯誤：軟體包：glibc-2.17-292.el7.i686 (base)
          需要：glibc-common = 2.17-292.el7
          已安裝: glibc-common-2.17-307.el7.1.x86_64 (@anaconda)
              glibc-common = 2.17-307.el7.1
          可用: glibc-common-2.17-292.el7.x86_64 (base)
              glibc-common = 2.17-292.el7
 您可以嘗試添加 --skip-broken 選項來解決該問題
 您可以嘗試執行：rpm -Va --nofiles --nodigest

yum downgrade glibc-common glibc -y

已安裝版本過高，需要降級

問題3：grpc版本過高問題

go run main.go --conf ../configs


/root/golang/pkg/mod/github.com/go-kratos/kratos@v0.6.0/pkg/net/rpc/warden/balancer/p2c/p2c.go:34:5: cannot use &p2cPickerBuilder literal (type *p2cPickerBuilder) as type base.PickerBuilder in assignment:
	*p2cPickerBuilder does not implement base.PickerBuilder (wrong type for Build method)
		have Build(map[resolver.Address]balancer.SubConn) balancer.Picker
		want Build(base.PickerBuildInfo) balancer.Picker
/root/golang/pkg/mod/github.com/go-kratos/kratos@v0.6.0/pkg/net/rpc/warden/balancer/p2c/p2c.go:35:5: cannot use &p2cPicker literal (type *p2cPicker) as type balancer.Picker in assignment:
	*p2cPicker does not implement balancer.Picker (wrong type for Pick method)
		have Pick(context.Context, balancer.PickInfo) (balancer.SubConn, func(balancer.DoneInfo), error)
		want Pick(balancer.PickInfo) (balancer.PickResult, error)
/root/golang/pkg/mod/github.com/go-kratos/kratos@v0.6.0/pkg/net/rpc/warden/balancer/p2c/p2c.go:42:32: not enough arguments in call to base.NewBalancerBuilder
	have (string, *p2cPickerBuilder)
	want (string, base.PickerBuilder, base.Config)
/root/golang/pkg/mod/github.com/go-kratos/kratos@v0.6.0/pkg/net/rpc/warden/balancer/p2c/p2c.go:144:2: cannot use p (type *p2cPicker) as type balancer.Picker in return argument:
	*p2cPicker does not implement balancer.Picker (wrong type for Pick method)
		have Pick(context.Context, balancer.PickInfo) (balancer.SubConn, func(balancer.DoneInfo), error)
		want Pick(balancer.PickInfo) (balancer.PickResult, error)

修改go.mod，降為v1.29.1
google.golang.org/grpc v1.29.1