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runner.go
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runner.go
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package command
import (
"bytes"
"fmt"
"io"
"os"
"os/exec"
"strings"
"sync"
"time"
"github.com/kubecolor/kubecolor/config"
"github.com/kubecolor/kubecolor/kubectl"
"github.com/kubecolor/kubecolor/printer"
"github.com/mattn/go-colorable"
)
var (
Stdout = colorable.NewColorableStdout()
Stderr = colorable.NewColorableStderr()
)
type Printers struct {
FullColoredPrinter printer.Printer
ErrorPrinter printer.Printer
}
// This is defined here to be replaced in test
var getPrinters = func(subcommandInfo *kubectl.SubcommandInfo, objFreshThreshold time.Duration, theme *config.Theme) *Printers {
return &Printers{
FullColoredPrinter: &printer.KubectlOutputColoredPrinter{
SubcommandInfo: subcommandInfo,
Recursive: subcommandInfo.Recursive,
ObjFreshThreshold: objFreshThreshold,
Theme: theme,
},
ErrorPrinter: &printer.WithFuncPrinter{
Fn: func(line string) config.Color {
if strings.HasPrefix(strings.ToLower(line), "error") {
return theme.Stderr.Error
}
return theme.Stderr.Default
},
},
}
}
func Run(args []string, version string) error {
config, err := ResolveConfig(args)
if err != nil {
return fmt.Errorf("resolve config: %w", err)
}
args = config.ArgsPassthrough
if config.ShowKubecolorVersion {
fmt.Fprintf(os.Stdout, "%s\n", version)
return nil
}
shouldColorize, subcommandInfo := ResolveSubcommand(args, config)
// when should not colorize, just run command and return
if !shouldColorize {
return execWithoutColors(config, args)
}
stdoutReader, stderrReader, err := execWithReaders(config, args)
if err != nil {
return err
}
// in case of panic, at least let kubectl finish executing
defer stdoutReader.Close()
defer stderrReader.Close()
// make buffer to be used in defer recover()
errBuf := new(bytes.Buffer)
errBufReader := io.TeeReader(stderrReader, errBuf)
printers := getPrinters(subcommandInfo, config.ObjFreshThreshold, config.Theme)
wg := &sync.WaitGroup{}
wg.Add(1)
go func() {
defer wg.Done()
defer func() {
if r := recover(); r != nil {
fmt.Fprintf(os.Stderr, "[kubecolor] [ERROR] Recovered from panic: %v\n", r)
fmt.Fprint(os.Stdout, errBuf.String())
}
}()
// This can panic when kubecolor has bug, so recover in defer
printers.FullColoredPrinter.Print(stdoutReader, Stdout)
}()
wg.Add(1)
go func() {
defer wg.Done()
// This will unlikely panic
printers.ErrorPrinter.Print(errBufReader, Stderr)
}()
wg.Wait()
return stdoutReader.Close()
}
func execWithoutColors(config *Config, args []string) error {
if config.StdinOverride != "" {
r, err := getStdinOverrideReader(config.StdinOverride)
if err != nil {
return err
}
defer r.Close()
_, err = io.Copy(Stdout, r)
return err
}
cmd := exec.Command(config.KubectlCmd, args...)
cmd.Stdin = os.Stdin
cmd.Stdout = Stdout
cmd.Stderr = Stderr
// when should not colorize, just run command and return
if err := cmd.Run(); err != nil {
return fmt.Errorf("%w", &KubectlError{ExitCode: cmd.ProcessState.ExitCode()})
}
return nil
}
func execWithReaders(config *Config, args []string) (io.ReadCloser, io.ReadCloser, error) {
if config.StdinOverride != "" {
stdout, err := getStdinOverrideReader(config.StdinOverride)
return stdout, nopReadCloser{}, err
}
cmd := exec.Command(config.KubectlCmd, args...)
cmd.Stdin = os.Stdin
// when colorize, capture stdout and err then colorize it
cmdOut, err := cmd.StdoutPipe()
if err != nil {
return nil, nil, err
}
cmdErr, err := cmd.StderrPipe()
if err != nil {
return nil, nil, err
}
if err := cmd.Start(); err != nil {
return nil, nil, err
}
return &cmdWaitReadCloser{cmd: cmd, stdout: cmdOut}, cmdErr, nil
}
func getStdinOverrideReader(stdinOverride string) (io.ReadCloser, error) {
if stdinOverride == "-" {
return os.Stdin, nil
}
file, err := os.Open(stdinOverride)
if err != nil {
return nil, fmt.Errorf("read file specified by --kubecolor-stdin: %w", err)
}
return file, nil
}
type nopReadCloser struct{}
func (nopReadCloser) Read(b []byte) (int, error) { return 0, io.EOF }
func (nopReadCloser) Close() error { return nil }
type cmdWaitReadCloser struct {
cmd *exec.Cmd
stdout io.ReadCloser
closed bool
lastErr error
}
func (r *cmdWaitReadCloser) Read(b []byte) (int, error) {
return r.stdout.Read(b)
}
func (r *cmdWaitReadCloser) Close() error {
if r.closed {
return r.lastErr
}
if err := r.stdout.Close(); err != nil {
r.lastErr = err
return err
}
if err := r.cmd.Wait(); err != nil {
r.lastErr = err
return &KubectlError{ExitCode: r.cmd.ProcessState.ExitCode()}
}
r.closed = true
return nil
}