快速创建一个api服务

$ cd $GOPATH/src
$ goctl api new greet

greet api服务目录树

├── etc
│   └── greet-api.yaml
├── go.mod
├── greet.api
├── greet.go
└── internal
    ├── config
    │   └── config.go
    ├── handler
    │   ├── greethandler.go
    │   └── routes.go
    ├── logic
    │   └── greetlogic.go
    ├── svc
    │   └── servicecontext.go
    └── types
        └── types.go

运行greet api

$ cd greet
$ go run greet.go -f etc/greet-api.yaml

将看到如下报错

$ go run greet.go etc/greet-api.yaml             
greet.go:11:2: cannot find package "github.com/tal-tech/go-zero/core/conf" in any of:
        /usr/local/go/src/github.com/tal-tech/go-zero/core/conf (from $GOROOT)
        /home/username/Develop/Go/src/github.com/tal-tech/go-zero/core/conf (from $GOPATH)
internal/logic/greetlogic.go:9:2: cannot find package "github.com/tal-tech/go-zero/core/logx" in any of:
        /usr/local/go/src/github.com/tal-tech/go-zero/core/logx (from $GOROOT)
        /home/username/Develop/Go/src/github.com/tal-tech/go-zero/core/logx (from $GOPATH)
greet.go:12:2: cannot find package "github.com/tal-tech/go-zero/rest" in any of:
        /usr/local/go/src/github.com/tal-tech/go-zero/rest (from $GOROOT)
        /home/username/Develop/Go/src/github.com/tal-tech/go-zero/rest (from $GOPATH)
internal/handler/greethandler.go:10:2: cannot find package "github.com/tal-tech/go-zero/rest/httpx" in any of:
        /usr/local/go/src/github.com/tal-tech/go-zero/rest/httpx (from $GOROOT)
        /home/username/Develop/Go/src/github.com/tal-tech/go-zero/rest/httpx (from $GOPATH)

使用 Go Modules 初始化项目并再次运行，Go Modules 将自动下载所需依赖，并在依赖下载完成后启动服务:

$ go mod init  
go: creating new go.mod: module greet

$ go run greet.go etc/greet-api.yaml
go: finding module for package github.com/tal-tech/go-zero/core/conf
go: finding module for package github.com/tal-tech/go-zero/rest
go: finding module for package github.com/tal-tech/go-zero/rest/httpx
go: finding module for package github.com/tal-tech/go-zero/core/logx
go: found github.com/tal-tech/go-zero/core/conf in github.com/tal-tech/go-zero v1.0.22
go: found github.com/tal-tech/go-zero/rest in github.com/tal-tech/go-zero v1.0.22
go: found github.com/tal-tech/go-zero/rest/httpx in github.com/tal-tech/go-zero v1.0.22
go: found github.com/tal-tech/go-zero/core/logx in github.com/tal-tech/go-zero v1.0.22
Starting server at 0.0.0.0:8888...

输出结果:

Starting server at 0.0.0.0:8888...

访问服务

$ curl -i http://localhost:8888/greet/from/you

输出结果:

HTTP/1.1 200 OK
Content-Type: application/json
Date: Thu, 22 Oct 2020 11:31:46 GMT
Content-Length: 14

{"message":""}

服务端输出:

Starting server at 0.0.0.0:8888...
{"@timestamp":"2020-10-22T11:31:46.248+08","level":"info","content":"200 - /greet/from/you - 127.0.0.1:56136 - curl/7.68.0 - 0.1ms","trace":"6b2d6d3c733233e9","span":"0"}

完整流程命令

环境:

$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 20.04.1 LTS
Release:        20.04
Codename:       focal

$ go version
go version go1.15.2 linux/amd64

安装

$ GO111MODULE=on GOPROXY=https://goproxy.cn/,direct go get -u github.com/tal-tech/go-zero/tools/goctl
go: found github.com/tal-tech/go-zero/tools/goctl in github.com/tal-tech/go-zero v1.0.22
go: downloading github.com/urfave/cli v1.22.4
go: downloading github.com/logrusorgru/aurora v2.0.3+incompatible
go: downloading github.com/iancoleman/strcase v0.0.0-20191112232945-16388991a334
go: downloading github.com/go-sql-driver/mysql v1.5.0
go: downloading github.com/cpuguy83/go-md2man/v2 v2.0.0-20190314233015-f79a8a8ca69d
go: downloading github.com/xwb1989/sqlparser v0.0.0-20180606152119-120387863bf2
go: downloading github.com/spaolacci/murmur3 v1.1.0
go: downloading github.com/russross/blackfriday/v2 v2.0.1
go: downloading go.uber.org/automaxprocs v1.3.0
go: downloading github.com/shurcooL/sanitized_anchor_name v1.0.0
go: downloading github.com/emicklei/proto v1.9.0
go: downloading gopkg.in/yaml.v2 v2.2.8
go: github.com/go-sql-driver/mysql upgrade => v1.5.0
go: gopkg.in/yaml.v2 upgrade => v2.3.0
go: github.com/urfave/cli upgrade => v1.22.4
go: github.com/cpuguy83/go-md2man/v2 upgrade => v2.0.0
go: github.com/iancoleman/strcase upgrade => v0.1.2
go: downloading github.com/cpuguy83/go-md2man/v2 v2.0.0
go: downloading github.com/iancoleman/strcase v0.1.2
go: downloading gopkg.in/yaml.v2 v2.3.0

$ export GOPATH=$(go env GOPATH)
$ export PATH="$GOPATH/bin:$PATH"

$ goctl -v
goctl version 20201021 linux/amd64

使用

第一个终端

$ cd $GOPATH/src

$ goctl api new greet
Done.

$ cd greet 

$ ls
etc  greet.api  greet.go  internal

$ go run greet.go etc/greet-api.yaml             
greet.go:11:2: cannot find package "github.com/tal-tech/go-zero/core/conf" in any of:
        /usr/local/go/src/github.com/tal-tech/go-zero/core/conf (from $GOROOT)
        /home/username/Develop/Go/src/github.com/tal-tech/go-zero/core/conf (from $GOPATH)
internal/logic/greetlogic.go:9:2: cannot find package "github.com/tal-tech/go-zero/core/logx" in any of:
        /usr/local/go/src/github.com/tal-tech/go-zero/core/logx (from $GOROOT)
        /home/username/Develop/Go/src/github.com/tal-tech/go-zero/core/logx (from $GOPATH)
greet.go:12:2: cannot find package "github.com/tal-tech/go-zero/rest" in any of:
        /usr/local/go/src/github.com/tal-tech/go-zero/rest (from $GOROOT)
        /home/username/Develop/Go/src/github.com/tal-tech/go-zero/rest (from $GOPATH)
internal/handler/greethandler.go:10:2: cannot find package "github.com/tal-tech/go-zero/rest/httpx" in any of:
        /usr/local/go/src/github.com/tal-tech/go-zero/rest/httpx (from $GOROOT)
        /home/username/Develop/Go/src/github.com/tal-tech/go-zero/rest/httpx (from $GOPATH)

$ go mod init  
go: creating new go.mod: module greet

$ go run greet.go etc/greet-api.yaml
go: finding module for package github.com/tal-tech/go-zero/core/conf
go: finding module for package github.com/tal-tech/go-zero/rest
go: finding module for package github.com/tal-tech/go-zero/rest/httpx
go: finding module for package github.com/tal-tech/go-zero/core/logx
go: found github.com/tal-tech/go-zero/core/conf in github.com/tal-tech/go-zero v1.0.22
go: found github.com/tal-tech/go-zero/rest in github.com/tal-tech/go-zero v1.0.22
go: found github.com/tal-tech/go-zero/rest/httpx in github.com/tal-tech/go-zero v1.0.22
go: found github.com/tal-tech/go-zero/core/logx in github.com/tal-tech/go-zero v1.0.22
Starting server at 0.0.0.0:8888...
{"@timestamp":"2020-10-22T23:22:17.248+08","level":"info","content":"200 - /greet/from/you - 127.0.0.1:56136 - curl/7.68.0 - 0.1ms","trace":"6b2d6d3c733233e9","span":"0"}

当服务起来后启动另一个终端

$ curl -i http://localhost:8888/greet/from/you
HTTP/1.1 200 OK
Content-Type: application/json
Date: Thu, 22 Oct 2020 15:26:00 GMT
Content-Length: 14

{"message":""}