golang rely mod of management

go early to consider the issue of dependency management, built-in go getcommands can be obtained directly corresponding dependence, very convenient, but there is a huge flaw, there is no version of the maintenance and management, and version inconsistencies can cause various compatibility issues, So there have been many rely on third-party management tools, depand glideis one of the best, to go 1.11 official has finally launched its own dependency management tools mod, and built-in versions go, go modmost before using simple, powerful, and can automatically compatible third-party tools, a large number of excellent open source libraries have been switched to go mod, a great tendency to dominate the arena

GO111MODULE

One of the biggest changes is golang project finally no longer rely on $GOPATHthe directory, and before the project due to the importproblem of the mechanism, all the projects are located in $GOPATH/srcthe directory, although there is not much problem, but always feel weird, go 1.11 finally adjusted this problem, the code from $GOPATHthe move, and for compatibility before research and development mode, still supports put $GOPATHunder, by GO111MODULEcontrolling the environment variable

• GO111MODULE=off: Close mod, look for vendordirectories and $GOPATHreliance in the path
• GO111MODULE=on: ON mod, based solely on go.moddownloads and rely Find
• GO111MODULE=auto: Defaults in the non- $GOPATHpath and contains go.modonly open mod project

The main command

go mod init     # 在新的 go 项目中执行，自动分析依赖，创建 go.sum
go mod tidy     # 自动分析依赖，并自动添加和删除依赖
go mod vendor   # 创建 vendor 目录，将依赖拷贝到当前的 vendor 文件夹下
go mod download # 手动下载依赖

1. Go for a new project, new projects only when implementation of what go mod init
2. After each database update, only the first code corresponding to import database, then perform go mod tidycan (can also be used go mod downloadmanually download)

Replace the library version

Manually modify go.modrequire field file, re-run go mod tidyto

require (
    github.com/gin-gonic/gin v1.4.0
)

golang version used in vthe beginning of the three version numbers, where the first digit indicates there is a significant update of the books, when a release v2+-time version of the library module my-moduleshould be changed module my-module/v2, otherwise introduced into the library requires increasing +incompatiblesuffix

require (
    github.com/lestrrat-go/file-rotatelogs v2.2.0+incompatible
)

GFW solve the problem

For some reason, the domestic network can not access the library on golang.org, but fortunately most of the library has a mirror on github, you can use replacethe command to set the mirror, I came across the following are some of the library's

replace (
    cloud.google.com/go => github.com/googleapis/google-cloud-go v0.0.0-20190603211518-c8433c9aaceb
    go.etcd.io/bbolt => github.com/etcd-io/bbolt v1.3.4-0.20191001164932-6e135e5d7e3d
    go.uber.org/atomic => github.com/uber-go/atomic v1.4.1-0.20190731194737-ef0d20d85b01
    go.uber.org/multierr => github.com/uber-go/multierr v1.2.0
    go.uber.org/zap => github.com/uber-go/zap v1.10.1-0.20190926184545-d8445f34b4ae
    golang.org/x/crypto => github.com/golang/crypto v0.0.0-20190605123033-f99c8df09eb5
    golang.org/x/exp => github.com/golang/exp v0.0.0-20190510132918-efd6b22b2522
    golang.org/x/image => github.com/golang/image v0.0.0-20190523035834-f03afa92d3ff
    golang.org/x/lint => github.com/golang/lint v0.0.0-20190409202823-959b441ac422
    golang.org/x/mobile => github.com/golang/mobile v0.0.0-20190607214518-6fa95d984e88
    golang.org/x/net => github.com/golang/net v0.0.0-20190606173856-1492cefac77f
    golang.org/x/oauth2 => github.com/golang/oauth2 v0.0.0-20190604053449-0f29369cfe45
    golang.org/x/sync => github.com/golang/sync v0.0.0-20190423024810-112230192c58
    golang.org/x/sys => github.com/golang/sys v0.0.0-20190602015325-4c4f7f33c9ed
    golang.org/x/text => github.com/golang/text v0.3.2
    golang.org/x/time => github.com/golang/time v0.0.0-20190308202827-9d24e82272b4
    golang.org/x/tools => github.com/golang/tools v0.0.0-20190608022120-eacb66d2a7c3
    google.golang.org/api => github.com/googleapis/google-api-go-client v0.6.0
    google.golang.org/appengine => github.com/golang/appengine v1.6.1
    google.golang.org/genproto => github.com/google/go-genproto v0.0.0-20190605220351-eb0b1bdb6ae6
    google.golang.org/grpc => github.com/grpc/grpc-go v1.21.1
)

After 1.12 GO supports a new environment variable GOPROXY, used to set the dependent proxy address, there are two common addresses: community goproxy.ioand they shoot clouds goproxy.cn, pro-test easy to use

export GO111MODULE=on
export GOPROXY=https://goproxy.io

Cache

Will be in the local cache, the cache path dependence go mod update $GOPATH/pkg/mod

IDE support

goland

Enable configuration mod

【Goland】→【Preference】→【Go Module (vgo)】→ 【Enable Go Modules (vgo)】→ 【OK】

After enabling mod, goland will automatically check for dependencies, and automatically update go.sum, thereby introducing dependencies, under normal circumstances are crippled, and occasionally does not help, perform manual go mod tidycan

vscode

vscode seems not updated automatically, manually perform go mod tidythe restart to take effect after the

link

• Official website: https://blog.golang.org/using-go-modules
• Go Modules: https://blog.csdn.net/ytd7777/article/details/86898187
• goproxy.io: https://goproxy.io/

Please indicate the source
article link: https://tech.hatlonely.com/article/56