Cobra CLI 支持在执行命令后调用 PostRun。
https://github.com/spf13/cobra#prerun-and-postrun-hooks
如何将命令状态传递给 PostRun 调用?我需要在命令执行后将命令状态发布到服务器
Cobra CLI 支持在执行命令后调用 PostRun。
https://github.com/spf13/cobra#prerun-and-postrun-hooks
如何将命令状态传递给 PostRun 调用?我需要在命令执行后将命令状态发布到服务器
更清洁的方法是利用 cobra 命令中提供的注释
package main
import (
"fmt"
"github.com/spf13/cobra"
)
func main() {
var rootCmd = &cobra.Command{
Use: "root [sub]",
Short: "My root command",
Run: func(cmd *cobra.Command, args []string) {
// Do your processing here
// Set the command annotations
cmd.Annotations = make(map[string]string)
cmd.Annotations["status"] = "status_goes_here"
cmd.Annotations["error"] = "error_goes_here"
},
PostRun: func(cmd *cobra.Command, args []string) {
// Retrieve the annotations
fmt.Println(cmd.Annotations["status"])
fmt.Println(cmd.Annotations["error"])
},
}
rootCmd.SetArgs([]string{"sub", "arg1", "arg2"})
rootCmd.Execute()
}
真的很喜欢@Bracken 在这里采用的方法,尽管有一些调整可以让它发挥作用
package main
import (
"fmt"
"errors"
"github.com/spf13/cobra"
)
type wrapper struct {
err error
}
// RunE fails to proceed further in case of error resulting in not executing PostRun actions
func (w *wrapper) Run(f func(cmd *cobra.Command, args []string) error) func(cmd *cobra.Command, args []string) {
return func(cmd *cobra.Command, args []string) {
err := f(cmd, args)
w.err = err
}
}
func (w *wrapper) PostRun(f func(cmd *cobra.Command, args []string, cmdErr error)) func(cmd *cobra.Command, args []string) {
return func(cmd *cobra.Command, args []string) {
f(cmd, args, w.err)
}
}
func main() {
cmdWrap := wrapper{}
var rootCmd = &cobra.Command{
Use: "root [sub]",
Short: "My root command",
Run: cmdWrap.Run(func(cmd *cobra.Command, args []string) error {
return errors.New("i'm not in the book, you know")
}),
PostRun: cmdWrap.PostRun(func(cmd *cobra.Command, args []string, cmdErr error) {
fmt.Printf("error was %v\n", cmdErr)
}),
}
rootCmd.SetArgs([]string{"sub", "arg1", "arg2"})
rootCmd.Execute()
}
----- 旧答案 -----
如果我理解正确的话,有一些状态需要从 cmd.Execute 传递到 PostRun。
您可以使用ExecuteContext(ctx context.Context)
方法代替Execute()
并设置需要在上下文中设置的任何键值。
ctx := context.WithValue(context.Background(), "status", "statusValue")
rootCmd.ExecuteContext(ctx)
可以使用 PostRun 检索相同的值cmd.Context()
PostRun: func(cmd *cobra.Command, args []string) {
ctx := cmd.Context()
status := ctx.Value("status")
}
我会使用高阶函数来包装你的Run
(或RunE
)函数和你的函数来捕获错误或恐慌,然后将它们传递给你的:PostRun
PostRun
package main
import (
"fmt"
"github.com/spf13/cobra"
)
type wrapper struct {
err error
}
func (w *wrapper) RunE(f func(cmd *cobra.Command, args []string) error) func(cmd *cobra.Command, args []string) error {
return func(cmd *cobra.Command, args []string) (err error) {
defer func() {
if r := recover(); r != nil {
err = fmt.Errorf("panic: %v", r)
w.err = err
}
}()
err = f(cmd, args)
w.err = err
return
}
}
func (w *wrapper) PostRun(f func(cmd *cobra.Command, args []string, cmdErr error)) func(cmd *cobra.Command, args []string) {
return func(cmd *cobra.Command, args []string) {
f(cmd, args, w.err)
}
}
func main() {
cmdWrap := wrapper{}
var cmdFail = &cobra.Command{
Use: "fail",
Short: "Doesn't work",
RunE: cmdWrap.RunE(func(cmd *cobra.Command, args []string) error {
panic("i'm not in the book, you know")
}),
PostRun: cmdWrap.PostRun(func(cmd *cobra.Command, args []string, cmdErr error) {
fmt.Printf("error was %v\n", cmdErr)
}),
}
var rootCmd = &cobra.Command{}
rootCmd.AddCommand(cmdFail)
rootCmd.Execute()
}