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args.go
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args.go
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package view
import (
"errors"
"fmt"
"github.com/urfave/cli"
"os"
"path/filepath"
"time"
)
const (
ArgName = "name"
ArgPrefix = "prefix"
ArgVerbose = "verbose"
ArgOut = "out"
ArgFollow = "follow"
ArgRefreshInterval = "refresh-interval"
)
type Args struct {
CgroupName string
CgroupPrefix string
VerboseOutput bool
OutputFile string
FollowMode bool
RefreshInterval float64
}
func flags() []cli.Flag {
return []cli.Flag{
cli.StringFlag{
Name: "name",
Usage: "Name of cgroup",
},
cli.StringFlag{
Name: "prefix",
Usage: "Cgroup prefix",
},
cli.BoolFlag{
Name: "verbose",
Usage: "Prints verbose information about a single cgroup.",
},
cli.StringFlag{
Name: "out",
Usage: "Writes to a given file if provided.",
},
cli.BoolFlag{
Name: "follow",
Usage: "Refreshes the output every interval.",
},
cli.Float64Flag{
Name: "refresh-interval",
Usage: "Refresh interval in seconds",
Value: 1.0,
},
}
}
func parseArgs(cCtx *cli.Context) (*Args, error) {
viewArgs := &Args{
CgroupName: cCtx.String(ArgName),
CgroupPrefix: cCtx.String(ArgPrefix),
VerboseOutput: cCtx.Bool(ArgVerbose),
OutputFile: cCtx.String(ArgOut),
FollowMode: cCtx.Bool(ArgFollow),
RefreshInterval: cCtx.Float64(ArgRefreshInterval),
}
if err := validateArguments(viewArgs); err != nil {
return nil, fmt.Errorf("error parsing list args: %s", err)
}
return viewArgs, nil
}
func validateArguments(args *Args) error {
if args.CgroupName == "" && args.CgroupPrefix == "" {
return errors.New("cgroup name or prefix must be specified")
}
if args.VerboseOutput && args.CgroupPrefix != "" {
return errors.New("you must specify a cgroup name when using verbose output")
}
if args.RefreshInterval < 0.0 {
return errors.New("you must specify a non-negative refresh interval")
}
if args.HasOutputFile() {
base, err := filepath.Abs(args.OutputFile)
if err != nil {
return err
}
_, err = os.Stat(filepath.Dir(base))
if err != nil {
return err
}
}
return nil
}
func (a *Args) HasPrefix() bool {
return a.CgroupPrefix != ""
}
func (a *Args) HasOutputFile() bool {
return a.OutputFile != ""
}
func (a *Args) GetRefreshInterval() time.Duration {
return time.Duration(a.RefreshInterval * float64(time.Second))
}