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cmd.go
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cmd.go
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package logs
import (
"bufio"
"fmt"
"io"
"math/rand"
"os"
"strings"
"time"
"github.com/fsnotify/fsnotify"
"github.com/jjzcru/elk/pkg/file"
"github.com/jjzcru/elk/pkg/utils"
"github.com/logrusorgru/aurora"
"github.com/spf13/cobra"
)
var usageTemplate = `Usage:
elk logs [tasks] [flags]
Flags:
-f, --file string Specify ox.yml file to be used
--follow Run in follow mode
-g, --global Search the task in the global path
-h, --help Help for logs
`
// Command returns a cobra command for `logs` sub command
func Command() *cobra.Command {
cmd := &cobra.Command{
Use: "logs",
Short: "Attach logs from a task to the terminal 📝",
Args: cobra.MinimumNArgs(1),
Run: func(cmd *cobra.Command, args []string) {
err := validate(cmd, args)
if err != nil {
utils.PrintError(err)
return
}
err = run(cmd, args)
if err != nil {
utils.PrintError(err)
}
},
}
cmd.Flags().BoolP("global", "g", false, "")
cmd.Flags().StringP("file", "f", "", "")
cmd.Flags().Bool("follow", false, "")
cmd.SetUsageTemplate(usageTemplate)
return cmd
}
func run(cmd *cobra.Command, args []string) error {
isFollow, err := cmd.Flags().GetBool("follow")
if err != nil {
return err
}
e, err := getElk(cmd)
if err != nil {
return err
}
ch := make(chan string)
errCh := make(chan error)
// Will use this to get the task with the larger name
taskNameLength := 0
for _, name := range args {
if len(name) > taskNameLength {
taskNameLength = len(name)
}
}
for _, name := range args {
task, err := e.GetTask(name)
if err != nil {
return err
}
f, err := os.Open(task.Log.Out)
if err != nil {
return err
}
f.Close()
var prefix string
if len(args) > 1 || (len(task.Log.Out) > 0 && len(task.Log.Err) > 0) {
prefix = getColorPrefix(name, taskNameLength)
}
go readLogFile(task.Log.Out, ch, errCh, isFollow, prefix)
if len(task.Log.Err) > 0 {
f, err = os.Open(task.Log.Err)
if err != nil {
return err
}
f.Close()
prefix = getErrorColorPrefix(name, taskNameLength)
go readLogFile(task.Log.Err, ch, errCh, isFollow, prefix)
}
}
for {
select {
case line := <-ch:
if len(line) > 0 {
fmt.Println(line)
}
case err := <-errCh:
if err == io.EOF {
fmt.Println()
return nil
}
return err
}
}
}
func readLogFile(filename string, ch chan string, errCh chan error, isFollow bool, prefix string) {
f, _ := os.Open(filename)
watcher, _ := fsnotify.NewWatcher()
defer watcher.Close()
defer f.Close()
_ = watcher.Add(filename)
delimiter := byte('\n')
r := bufio.NewReader(f)
if isFollow {
for {
by, err := r.ReadBytes(delimiter)
if err != nil && err != io.EOF {
errCh <- err
}
ch <- getStringFromBytes(by, prefix)
if err != io.EOF {
continue
}
if err = waitForChange(watcher); err != nil {
errCh <- err
}
}
} else {
for {
by, err := r.ReadBytes(delimiter)
if err != nil && err != io.EOF {
errCh <- err
}
ch <- getStringFromBytes(by, prefix)
if err == io.EOF {
errCh <- err
close(ch)
break
}
}
}
}
func getStringFromBytes(by []byte, prefix string) string {
content := string(by)
content = strings.ReplaceAll(content, file.BreakLine, "")
clearScreenSequece := "[2J"
if len(content) == 0 {
return ""
}
if strings.Contains(content, clearScreenSequece) {
return ""
}
// Do not add prefix if we are clearing the screen
if len(prefix) > 0 {
return prefix + content
}
return content
}
func waitForChange(w *fsnotify.Watcher) error {
for {
select {
case event := <-w.Events:
if event.Op&fsnotify.Write == fsnotify.Write {
return nil
}
case err := <-w.Errors:
return err
}
}
}
func getColorPrefix(name string, taskNameLength int) string {
name = getPrefixName(name, taskNameLength)
rand.Seed(time.Now().UnixNano())
switch n := rand.Intn(10); n {
case 0:
return aurora.Bold(aurora.Green(fmt.Sprintf("%s | ", name))).String()
case 1:
return aurora.Bold(aurora.Yellow(fmt.Sprintf("%s | ", name))).String()
case 3:
return aurora.Bold(aurora.BrightMagenta(fmt.Sprintf("%s | ", name))).String()
case 4:
return aurora.Bold(aurora.Blue(fmt.Sprintf("%s | ", name))).String()
case 5:
return aurora.Bold(aurora.Magenta(fmt.Sprintf("%s | ", name))).String()
case 6:
return aurora.Bold(aurora.Cyan(fmt.Sprintf("%s | ", name))).String()
case 7:
return aurora.Bold(aurora.BrightGreen(fmt.Sprintf("%s | ", name))).String()
case 8:
return aurora.Bold(aurora.BrightYellow(fmt.Sprintf("%s | ", name))).String()
case 9:
return aurora.Bold(aurora.BrightCyan(fmt.Sprintf("%s | ", name))).String()
default:
return aurora.Bold(aurora.BrightBlue(fmt.Sprintf("%s | ", name))).String()
}
}
func getErrorColorPrefix(name string, taskNameLength int) string {
return aurora.Bold(aurora.Red(fmt.Sprintf("%s | ", getPrefixName(name, taskNameLength)))).String()
}
func getPrefixName(name string, taskNameLength int) string {
difference := taskNameLength - len(name)
for i := 0; i < difference; i++ {
name += " "
}
return name
}