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// recfile -- GNU recutils'es recfiles parser on pure Go
// Copyright (C) 2020-2024 Sergey Matveev <stargrave@stargrave.org>
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, version 3 of the License.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package slog
import (
"bytes"
"context"
"io"
"log/slog"
"sync"
"time"
"go.cypherpunks.su/recfile/v2"
)
type RecfileHandler struct {
W io.Writer
Level slog.Level
LevelKey string
MsgKey string
TimeKey string
attrs []slog.Attr
group string
m *sync.Mutex
}
func NewRecfileHandler(
w io.Writer,
level slog.Level,
levelKey, msgKey, timeKey string,
) *RecfileHandler {
return &RecfileHandler{
W: w,
Level: level,
LevelKey: levelKey,
MsgKey: msgKey,
TimeKey: timeKey,
m: new(sync.Mutex),
}
}
func (h *RecfileHandler) Enabled(ctx context.Context, level slog.Level) bool {
return level >= h.Level
}
func (h *RecfileHandler) WithAttrs(attrs []slog.Attr) slog.Handler {
return &RecfileHandler{
W: h.W,
Level: h.Level,
LevelKey: h.LevelKey,
MsgKey: h.MsgKey,
TimeKey: h.TimeKey,
attrs: append(h.attrs, attrs...),
group: h.group,
m: h.m,
}
}
func (h *RecfileHandler) WithGroup(name string) slog.Handler {
neu := RecfileHandler{
W: h.W,
Level: h.Level,
LevelKey: h.LevelKey,
MsgKey: h.MsgKey,
TimeKey: h.TimeKey,
attrs: h.attrs,
group: h.group + name + "_",
m: h.m,
}
return &neu
}
func writeValue(w *recfile.Writer, group string, attr slog.Attr) (err error) {
if attr.Value.Kind() == slog.KindAny {
multiline, ok := attr.Value.Any().([]string)
if ok {
if len(multiline) > 0 {
_, err = w.WriteFieldMultiline(group+attr.Key, multiline)
return
}
return
}
}
_, err = w.WriteFields(recfile.Field{
Name: group + attr.Key,
Value: attr.Value.String(),
})
return
}
func (h *RecfileHandler) Handle(ctx context.Context, rec slog.Record) (err error) {
var b bytes.Buffer
w := recfile.NewWriter(&b)
_, err = w.RecordStart()
if err != nil {
panic(err)
}
var fields []recfile.Field
if h.LevelKey != "" {
fields = append(fields, recfile.Field{
Name: h.LevelKey,
Value: rec.Level.String(),
})
}
if h.TimeKey != "" {
fields = append(fields, recfile.Field{
Name: h.TimeKey,
Value: rec.Time.UTC().Format(time.RFC3339Nano),
})
}
fields = append(fields, recfile.Field{Name: h.MsgKey, Value: rec.Message})
_, err = w.WriteFields(fields...)
if err != nil {
return
}
for _, attr := range h.attrs {
writeValue(w, h.group, attr)
}
rec.Attrs(func(attr slog.Attr) bool { return writeValue(w, h.group, attr) == nil })
h.m.Lock()
n, err := h.W.Write(b.Bytes())
h.m.Unlock()
if err != nil {
return
}
if n != b.Len() {
return io.EOF
}
return
}
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