欢迎关注和投票：申请中科大镜像站提供 Golang 模块（依赖）镜像服务

[nanmu42]

投票方式

• 中科大新增镜像申请的 Issue： https://github.com/ustclug/mirrorrequest/issues/234
• 使用 Emoji +1 （向上的大拇指）表情来投票。

下面是对提案的全文转载：

介绍

Golang 从 1.11 版本起支持以模块（ Module ）的形式管理依赖，并且支持下载依赖时使用镜像源以加速下载。

Golang 的依赖并没有统一的上游（但镜像仍然可行，请参阅后文），常见上游为：

• github.com
• golang.org
• cloud.google.com
• google.golang.org

由于一些原因，国内网络环境难以访问其中的一些上游。

为什么希望添加该镜像

Golang 是一门在工程学和实际应用上都很优秀的语言，拥有广袤的云原生应用和生态。因为网络原因而无法获得这些优质依赖未免可惜。

如何实现镜像

按照 Go 的 module proxy 规范，满足下列要求的 web 服务即可视为一个合格的 module proxy：

A Go module proxy is any web server that can respond to GET requests for
URLs of a specified form. The requests have no query parameters, so even
a site serving from a fixed file system (including a file:/// URL)
can be a module proxy.

The GET requests sent to a Go module proxy are:

GET $GOPROXY/<module>/@v/list returns a list of all known versions of the
given module, one per line.

GET $GOPROXY/<module>/@v/<version>.info returns JSON-formatted metadata
about that version of the given module.

GET $GOPROXY/<module>/@v/<version>.mod returns the go.mod file
for that version of the given module.

GET $GOPROXY/<module>/@v/<version>.zip returns the zip archive
for that version of the given module.

To avoid problems when serving from case-sensitive file systems,
the <module> and <version> elements are case-encoded, replacing every
uppercase letter with an exclamation mark followed by the corresponding
lower-case letter: github.com/Azure encodes as github.com/!azure.

The JSON-formatted metadata about a given module corresponds to
this Go data structure, which may be expanded in the future:

    type Info struct {
        Version string    // version string
        Time    time.Time // commit time
    }

The zip archive for a specific version of a given module is a
standard zip file that contains the file tree corresponding
to the module's source code and related files. The archive uses
slash-separated paths, and every file path in the archive must
begin with <module>@<version>/, where the module and version are
substituted directly, not case-encoded. The root of the module
file tree corresponds to the <module>@<version>/ prefix in the
archive.

Even when downloading directly from version control systems,
the go command synthesizes explicit info, mod, and zip files
and stores them in its local cache, $GOPATH/pkg/mod/cache/download,
the same as if it had downloaded them directly from a proxy.
The cache layout is the same as the proxy URL space, so
serving $GOPATH/pkg/mod/cache/download at (or copying it to)
https://example.com/proxy would let other users access those
cached module versions with GOPROXY=https://example.com/proxy.

注意： 由于 Go 提案 25530 （官方接受）的存在，Go proxy 还需要能够按一定规则返回依赖的 checksum 信息。

官方实现（没有开源）在： https://proxy.golang.org/

开源的镜像实现有：

• https://github.com/goproxyio/goproxy
• https://github.com/goproxy/goproxy.cn
• https://github.com/goproxy/goproxy

也许贵站可以采用和参考。

备注

• 相关的 Issue： #225 .