wings/loggers/cli/cli.go

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package cli
import (
"fmt"
"io"
"os"
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"strings"
"sync"
"time"
"emperror.dev/errors"
"github.com/apex/log"
"github.com/apex/log/handlers/cli"
color2 "github.com/fatih/color"
"github.com/mattn/go-colorable"
)
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var (
Default = New(os.Stderr, true)
bold = color2.New(color2.Bold)
boldred = color2.New(color2.Bold, color2.FgRed)
)
var Strings = [...]string{
log.DebugLevel: "DEBUG",
log.InfoLevel: " INFO",
log.WarnLevel: " WARN",
log.ErrorLevel: "ERROR",
log.FatalLevel: "FATAL",
}
type Handler struct {
mu sync.Mutex
Writer io.Writer
Padding int
}
func New(w io.Writer, useColors bool) *Handler {
if f, ok := w.(*os.File); ok {
if useColors {
return &Handler{Writer: colorable.NewColorable(f), Padding: 2}
}
}
return &Handler{Writer: colorable.NewNonColorable(w), Padding: 2}
}
// HandleLog implements log.Handler.
func (h *Handler) HandleLog(e *log.Entry) error {
color := cli.Colors[e.Level]
level := Strings[e.Level]
names := e.Fields.Names()
h.mu.Lock()
defer h.mu.Unlock()
color.Fprintf(h.Writer, "%s: [%s] %-25s", bold.Sprintf("%*s", h.Padding+1, level), time.Now().Format(time.StampMilli), e.Message)
for _, name := range names {
if name == "source" {
continue
}
fmt.Fprintf(h.Writer, " %s=%v", color.Sprint(name), e.Fields.Get(name))
}
fmt.Fprintln(h.Writer)
for _, name := range names {
if name != "error" {
continue
}
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if err, ok := e.Fields.Get("error").(error); ok {
// Attach the stacktrace if it is missing at this point, but don't point
// it specifically to this line since that is irrelevant.
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err = errors.WithStackDepthIf(err, 4)
formatted := fmt.Sprintf("\n%s\n%+v\n\n", boldred.Sprintf("Stacktrace:"), err)
if !strings.Contains(formatted, "runtime.goexit") {
_, _ = fmt.Fprint(h.Writer, formatted)
break
}
// Inserts a new-line between sections of a stack.
// When wrapping errors, you get multiple separate stacks that start with their message,
// this allows us to separate them with a new-line and view them more easily.
//
// For example:
//
// Stacktrace:
// readlink test: no such file or directory
// failed to read symlink target for 'test'
// github.com/pterodactyl/wings/server/filesystem.(*Archive).addToArchive
// github.com/pterodactyl/wings/server/filesystem/archive.go:166
// ... (Truncated the stack for easier reading)
// runtime.goexit
// runtime/asm_amd64.s:1374
// **NEW LINE INSERTED HERE**
// backup: error while generating server backup
// github.com/pterodactyl/wings/server.(*Server).Backup
// github.com/pterodactyl/wings/server/backup.go:84
// ... (Truncated the stack for easier reading)
// runtime.goexit
// runtime/asm_amd64.s:1374
//
var b strings.Builder
var endOfStack bool
for _, s := range strings.Split(formatted, "\n") {
b.WriteString(s + "\n")
if s == "runtime.goexit" {
endOfStack = true
continue
}
if !endOfStack {
continue
}
b.WriteString("\n")
endOfStack = false
}
_, _ = fmt.Fprint(h.Writer, b.String())
}
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// Only one key with the name "error" can be in the map.
break
}
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return nil
}