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// Copyright 2015 Matthew Holt and The Caddy Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package logging
import (
"fmt"
"io"
"os"
"path/filepath"
"github.com/caddyserver/caddy/v2"
"gopkg.in/natefinch/lumberjack.v2"
)
func init() {
caddy.RegisterModule(FileWriter{})
}
// FileWriter can write logs to files. By default, log files
// are rotated ("rolled") when they get large, and old log
// files get deleted, to ensure that the process does not
// exhaust disk space.
type FileWriter struct {
// Filename is the name of the file to write.
Filename string `json:"filename,omitempty"`
// Roll toggles log rolling or rotation, which is
// enabled by default.
Roll *bool `json:"roll,omitempty"`
// When a log file reaches approximately this size,
// it will be rotated.
RollSizeMB int `json:"roll_size_mb,omitempty"`
// Whether to compress rolled files. Default: true
RollCompress *bool `json:"roll_gzip,omitempty"`
// Whether to use local timestamps in rolled filenames.
// Default: false
RollLocalTime bool `json:"roll_local_time,omitempty"`
// The maximum number of rolled log files to keep.
// Default: 10
RollKeep int `json:"roll_keep,omitempty"`
// How many days to keep rolled log files. Default: 90
RollKeepDays int `json:"roll_keep_days,omitempty"`
}
// CaddyModule returns the Caddy module information.
func (FileWriter) CaddyModule() caddy.ModuleInfo {
return caddy.ModuleInfo{
ID: "caddy.logging.writers.file",
New: func() caddy.Module { return new(FileWriter) },
}
}
// Provision sets up the module
func (fw *FileWriter) Provision(ctx caddy.Context) error {
// Replace placeholder in filename
repl := caddy.NewReplacer()
filename, err := repl.ReplaceOrErr(fw.Filename, true, true)
if err != nil {
return fmt.Errorf("invalid filename for log file: %v", err)
}
fw.Filename = filename
return nil
}
func (fw FileWriter) String() string {
fpath, err := filepath.Abs(fw.Filename)
if err == nil {
return fpath
}
return fw.Filename
}
// WriterKey returns a unique key representing this fw.
func (fw FileWriter) WriterKey() string {
return "file:" + fw.Filename
}
// OpenWriter opens a new file writer.
func (fw FileWriter) OpenWriter() (io.WriteCloser, error) {
// roll log files by default
if fw.Roll == nil || *fw.Roll {
if fw.RollSizeMB == 0 {
fw.RollSizeMB = 100
}
if fw.RollCompress == nil {
compress := true
fw.RollCompress = &compress
}
if fw.RollKeep == 0 {
fw.RollKeep = 10
}
if fw.RollKeepDays == 0 {
fw.RollKeepDays = 90
}
return &lumberjack.Logger{
Filename: fw.Filename,
MaxSize: fw.RollSizeMB,
MaxAge: fw.RollKeepDays,
MaxBackups: fw.RollKeep,
LocalTime: fw.RollLocalTime,
Compress: *fw.RollCompress,
}, nil
}
// otherwise just open a regular file
return os.OpenFile(fw.Filename, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0666)
}
// Interface guards
var (
_ caddy.Provisioner = (*FileWriter)(nil)
)
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