是否可以将Go供应商库与Google App Engine一起使用？

Question

我正在尝试将一个小型测试应用程序部署到Google App Engine(标准版).如果我包含任何供应商库,我会收到错误.

这是我尝试部署时遇到的错误

% gcloud app deploy
Services to deploy:

descriptor:      [/Users/matt/work/appenginetest1/src/hello/default/app.yaml]
source:          [/Users/matt/work/appenginetest1/src/hello/default]
target project:  REDACTED
target service:  [default]
target version:  [20170709t220721]
target url:      REDACTED


Do you want to continue (Y/n)?  y

Beginning deployment of service [default]...
??????????????????????????????????????????????????????????????
?? Uploading 0 files to Google Cloud Storage                ??
??????????????????????????????????????????????????????????????
File upload done.
Updating service [default]...failed.
ERROR: (gcloud.app.deploy) Error Response: [9] Deployment contains files that cannot be compiled: Compile failed:
go-app-builder: build timing: 2×compile (210ms total), 0×link (0s total)
go-app-builder: failed running compile: exit status 2

main.go:6: can't find import: "github.com/julienschmidt/httprouter"

对于某些上下文,这是$ GOPATH的树

% tree $GOPATH
/Users/matt/work/appenginetest1
??? src
    ??? hello
        ??? default
        ?   ??? app.yaml
        ?   ??? main.go
        ??? glide.lock
        ??? glide.yaml
        ??? vendor
            ??? github.com
                ??? julienschmidt
                    ??? httprouter
                        ??? path.go
                        ??? router.go
                        ??? tree.go

通过dev_appserver.py运行本地服务器工作正常.它看起来不像app引擎在运行后没有找到供应商目录的情况

% rm -rf ~/work/appenginetest1/src/hello/vendor/github.com

它甚至在推送到云之前就出错了

% gcloud app deploy
ERROR: (gcloud.app.deploy) Staging command [/usr/local/Caskroom/google-cloud-sdk/latest/google-cloud-sdk/platform/google_appengine/goroot-1.6/bin/go-app-stager /Users/matt/work/appenginetest1/src/hello/default/app.yaml /var/folders/nx/8w2_6q551cl50h3ff6lmy9s40000gn/T/tmp97Kiis/tmpe0MHQ0] failed with return code [1].

------------------------------------ STDOUT ------------------------------------
------------------------------------ STDERR ------------------------------------
2017/07/09 22:12:52 failed analyzing /Users/matt/work/appenginetest1/src/hello/default: cannot find package "github.com/julienschmidt/httprouter" in any of:
    /Users/matt/work/appenginetest1/src/hello/vendor/github.com/julienschmidt/httprouter (vendor tree)
    ($GOROOT not set)
    /Users/matt/work/appenginetest1/src/github.com/julienschmidt/httprouter (from $GOPATH)
GOPATH: /Users/matt/work/appenginetest1
--------------------------------------------------------------------------------

如果我将github.com目录从供应商移动到src,则部署工作没有问题.

的app.yaml

service: default
runtime: go
api_version: go1


handlers:
- url: /.*
  script: _go_app

main.go

package hello

import (
  "fmt"
  "net/http"
  "github.com/julienschmidt/httprouter"
)

func init() {
  router := httprouter.New()
  router.GET("/hello/:name", Hello)
  http.Handle("/", router)
}

func Hello(w http.ResponseWriter, r *http.Request, ps httprouter.Params) {
  fmt.Fprintf(w, "Hello, %s!", ps.ByName("name"))
}

如果我在运行滑动安装后将github.com目录从vendor移动到src,我可以部署这个项目.

Answer 1

您可以使用$GOPATH变量来解决这个问题。请注意，您的$GOPATH环境变量实际上可以是多个位置的列表（有关更多信息，请参阅https://golang.org/cmd/go/#hdr-GOPATH_environment_variable ）：

GOPATH 环境变量列出了查找 Go 代码的位置。在 Unix 上，该值是一个以冒号分隔的字符串。在 Windows 上，该值是一个以分号分隔的字符串。在计划 9 中，该值是一个列表。

vendor/github.com您可以编写一个脚本，暂时将该目录添加到$GOPATH环境变量中，执行部署，然后将其从环境变量中删除，而不是将 github.com 目录从供应商移动到 src 。