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list.go
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list.go
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package main
import (
"encoding/json"
"fmt"
"os"
"path"
"text/tabwriter"
"mydocker/container"
log "github.com/sirupsen/logrus"
)
func ListContainers() {
// 读取存放容器信息目录下的所有文件
files, err := os.ReadDir(container.InfoLoc)
if err != nil {
log.Errorf("read dir %s error %v", container.InfoLoc, err)
return
}
containers := make([]*container.Info, 0, len(files))
for _, file := range files {
tmpContainer, err := getContainerInfo(file)
if err != nil {
log.Errorf("get container info error %v", err)
continue
}
containers = append(containers, tmpContainer)
}
// 使用tabwriter.NewWriter在控制台打印出容器信息
// tabwriter 是引用的text/tabwriter类库,用于在控制台打印对齐的表格
w := tabwriter.NewWriter(os.Stdout, 12, 1, 3, ' ', 0)
_, err = fmt.Fprint(w, "ID\tNAME\tPID\tIP\tSTATUS\tCOMMAND\tCREATED\n")
if err != nil {
log.Errorf("Fprint error %v", err)
}
for _, item := range containers {
_, err = fmt.Fprintf(w, "%s\t%s\t%s\t%s\t%s\t%s\t%s\n",
item.Id,
item.Name,
item.Pid,
item.IP,
item.Status,
item.Command,
item.CreatedTime)
if err != nil {
log.Errorf("Fprint error %v", err)
}
}
if err = w.Flush(); err != nil {
log.Errorf("Flush error %v", err)
}
}
func getContainerInfo(file os.DirEntry) (*container.Info, error) {
// 根据文件名拼接出完整路径
configFileDir := fmt.Sprintf(container.InfoLocFormat, file.Name())
configFileDir = path.Join(configFileDir, container.ConfigName)
// 读取容器配置文件
content, err := os.ReadFile(configFileDir)
if err != nil {
log.Errorf("read file %s error %v", configFileDir, err)
return nil, err
}
info := new(container.Info)
if err = json.Unmarshal(content, info); err != nil {
log.Errorf("json unmarshal error %v", err)
return nil, err
}
return info, nil
}