use go 1.12

Signed-off-by: hongming <talonwan@yunify.com>

vendor/github.com/mholt/caddy/caddyhttp/httpserver/roller.go

@@ -0,0 +1,143 @@
+// Copyright 2015 Light Code Labs, LLC
+//
+// 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 httpserver
+
+import (
+	"errors"
+	"io"
+	"path/filepath"
+	"strconv"
+
+	lumberjack "gopkg.in/natefinch/lumberjack.v2"
+)
+
+// LogRoller implements a type that provides a rolling logger.
+type LogRoller struct {
+	Disabled   bool
+	Filename   string
+	MaxSize    int
+	MaxAge     int
+	MaxBackups int
+	Compress   bool
+	LocalTime  bool
+}
+
+// GetLogWriter returns an io.Writer that writes to a rolling logger.
+// This should be called only from the main goroutine (like during
+// server setup) because this method is not thread-safe; it is careful
+// to create only one log writer per log file, even if the log file
+// is shared by different sites or middlewares. This ensures that
+// rolling is synchronized, since a process (or multiple processes)
+// should not create more than one roller on the same file at the
+// same time. See issue #1363.
+func (l LogRoller) GetLogWriter() io.Writer {
+	absPath, err := filepath.Abs(l.Filename)
+	if err != nil {
+		absPath = l.Filename // oh well, hopefully they're consistent in how they specify the filename
+	}
+	lj, has := lumberjacks[absPath]
+	if !has {
+		lj = &lumberjack.Logger{
+			Filename:   l.Filename,
+			MaxSize:    l.MaxSize,
+			MaxAge:     l.MaxAge,
+			MaxBackups: l.MaxBackups,
+			Compress:   l.Compress,
+			LocalTime:  l.LocalTime,
+		}
+		lumberjacks[absPath] = lj
+	}
+	return lj
+}
+
+// IsLogRollerSubdirective is true if the subdirective is for the log roller.
+func IsLogRollerSubdirective(subdir string) bool {
+	return subdir == directiveRotateSize ||
+		subdir == directiveRotateAge ||
+		subdir == directiveRotateKeep ||
+		subdir == directiveRotateCompress ||
+		subdir == directiveRotateDisable
+}
+
+var errInvalidRollParameter = errors.New("invalid roller parameter")
+
+// ParseRoller parses roller contents out of c.
+func ParseRoller(l *LogRoller, what string, where ...string) error {
+	if l == nil {
+		l = DefaultLogRoller()
+	}
+
+	// rotate_compress doesn't accept any parameters.
+	// others only accept one parameter
+	if ((what == directiveRotateCompress || what == directiveRotateDisable) && len(where) != 0) ||
+		((what != directiveRotateCompress && what != directiveRotateDisable) && len(where) != 1) {
+		return errInvalidRollParameter
+	}
+
+	var (
+		value int
+		err   error
+	)
+	if what != directiveRotateCompress && what != directiveRotateDisable {
+		value, err = strconv.Atoi(where[0])
+		if err != nil {
+			return err
+		}
+	}
+
+	switch what {
+	case directiveRotateDisable:
+		l.Disabled = true
+	case directiveRotateSize:
+		l.MaxSize = value
+	case directiveRotateAge:
+		l.MaxAge = value
+	case directiveRotateKeep:
+		l.MaxBackups = value
+	case directiveRotateCompress:
+		l.Compress = true
+	}
+	return nil
+}
+
+// DefaultLogRoller will roll logs by default.
+func DefaultLogRoller() *LogRoller {
+	return &LogRoller{
+		MaxSize:    defaultRotateSize,
+		MaxAge:     defaultRotateAge,
+		MaxBackups: defaultRotateKeep,
+		Compress:   false,
+		LocalTime:  true,
+	}
+}
+
+const (
+	// defaultRotateSize is 100 MB.
+	defaultRotateSize = 100
+	// defaultRotateAge is 14 days.
+	defaultRotateAge = 14
+	// defaultRotateKeep is 10 files.
+	defaultRotateKeep = 10
+
+	directiveRotateDisable  = "rotate_disable"
+	directiveRotateSize     = "rotate_size"
+	directiveRotateAge      = "rotate_age"
+	directiveRotateKeep     = "rotate_keep"
+	directiveRotateCompress = "rotate_compress"
+)
+
+// lumberjacks maps log filenames to the logger
+// that is being used to keep them rolled/maintained.
+var lumberjacks = make(map[string]io.Writer)