cloudflared-mirror/logger/create.go

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package logger
import (
"fmt"
"os"
"strings"
"time"
"github.com/alecthomas/units"
)
// Option is to encaspulate actions that will be called by Parse and run later to build an Options struct
type Option func(*Options) error
// Options is use to set logging configuration data
type Options struct {
logFileDirectory string
maxFileSize units.Base2Bytes
maxFileCount uint
terminalOutputDisabled bool
supportedFileLevels []Level
supportedTerminalLevels []Level
}
// DisableTerminal stops terminal output for the logger
func DisableTerminal(disable bool) Option {
return func(c *Options) error {
c.terminalOutputDisabled = disable
return nil
}
}
// File sets a custom file to log events
func File(path string, size units.Base2Bytes, count uint) Option {
return func(c *Options) error {
c.logFileDirectory = path
c.maxFileSize = size
c.maxFileCount = count
return nil
}
}
// DefaultFile configures the log options will the defaults
func DefaultFile(directoryPath string) Option {
return func(c *Options) error {
size, err := units.ParseBase2Bytes("1MB")
if err != nil {
return err
}
c.logFileDirectory = directoryPath
c.maxFileSize = size
c.maxFileCount = 5
return nil
}
}
// SupportedFileLevels sets the supported logging levels for the log file
func SupportedFileLevels(supported []Level) Option {
return func(c *Options) error {
c.supportedFileLevels = supported
return nil
}
}
// SupportedTerminalevels sets the supported logging levels for the terminal output
func SupportedTerminalevels(supported []Level) Option {
return func(c *Options) error {
c.supportedTerminalLevels = supported
return nil
}
}
// LogLevelString sets the supported logging levels from a command line flag
func LogLevelString(level string) Option {
return func(c *Options) error {
supported, err := ParseLevelString(level)
if err != nil {
return err
}
c.supportedFileLevels = supported
c.supportedTerminalLevels = supported
return nil
}
}
// Parse builds the Options struct so the caller knows what actions should be run
func Parse(opts ...Option) (*Options, error) {
options := &Options{}
for _, opt := range opts {
if err := opt(options); err != nil {
return nil, err
}
}
return options, nil
}
// New setups a new logger based on the options.
// The default behavior is to write to standard out
func New(opts ...Option) (Service, error) {
config, err := Parse(opts...)
if err != nil {
return nil, err
}
l := NewOutputWriter(SharedWriteManager)
if config.logFileDirectory != "" {
l.Add(NewFileRollingWriter(config.logFileDirectory,
"cloudflared",
int64(config.maxFileSize),
config.maxFileCount),
NewDefaultFormatter(time.RFC3339Nano), config.supportedFileLevels...)
}
if !config.terminalOutputDisabled {
if len(config.supportedTerminalLevels) == 0 {
l.Add(os.Stdout, NewTerminalFormatter(""), InfoLevel)
l.Add(os.Stderr, NewTerminalFormatter(""), ErrorLevel, FatalLevel)
} else {
errLevels := []Level{}
outLevels := []Level{}
for _, level := range config.supportedTerminalLevels {
if level == ErrorLevel || level == FatalLevel {
errLevels = append(errLevels, level)
} else {
outLevels = append(outLevels, level)
}
}
l.Add(os.Stdout, NewTerminalFormatter(""), outLevels...)
l.Add(os.Stderr, NewTerminalFormatter(""), errLevels...)
}
}
return l, nil
}
// ParseLevelString returns the expected log levels based on the cmd flag
func ParseLevelString(lvl string) ([]Level, error) {
switch strings.ToLower(lvl) {
case "fatal":
return []Level{FatalLevel}, nil
case "error":
return []Level{FatalLevel, ErrorLevel}, nil
case "info", "warn":
return []Level{FatalLevel, ErrorLevel, InfoLevel}, nil
case "debug":
return []Level{FatalLevel, ErrorLevel, InfoLevel, DebugLevel}, nil
}
return []Level{}, fmt.Errorf("not a valid log level: %q", lvl)
}