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logger.go
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logger.go
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package server
import (
"sync"
"github.com/go-kit/log"
"github.com/weaveworks/common/logging"
cortex_log "github.com/cortexproject/cortex/pkg/util/log"
)
// Logger implements Go Kit's log.Logger interface. It supports being
// dynamically updated at runtime.
type Logger struct {
// mut protects against race conditions accessing l, which can be modified
// and accessed concurrently if ApplyConfig and Log are called at the same
// time.
mut sync.RWMutex
l log.Logger
// makeLogger will default to defaultLogger. It's a struct
// member to make testing work properly.
makeLogger func(*Config) (log.Logger, error)
}
// NewLogger creates a new Logger.
func NewLogger(cfg *Config) *Logger {
return newLogger(cfg, defaultLogger)
}
// NewLoggerFromLevel creates a new logger from logging.Level and logging.Format.
func NewLoggerFromLevel(lvl logging.Level, fmt logging.Format) *Logger {
logger, err := makeDefaultLogger(lvl, fmt)
if err != nil {
panic(err)
}
return &Logger{
l: logger,
}
}
func newLogger(cfg *Config, ctor func(*Config) (log.Logger, error)) *Logger {
l := Logger{makeLogger: ctor}
if err := l.ApplyConfig(cfg); err != nil {
panic(err)
}
return &l
}
// ApplyConfig applies configuration changes to the logger.
func (l *Logger) ApplyConfig(cfg *Config) error {
l.mut.Lock()
defer l.mut.Unlock()
newLogger, err := l.makeLogger(cfg)
if err != nil {
return err
}
l.l = newLogger
return nil
}
func defaultLogger(cfg *Config) (log.Logger, error) {
return makeDefaultLogger(cfg.LogLevel, cfg.LogFormat)
}
func makeDefaultLogger(lvl logging.Level, fmt logging.Format) (log.Logger, error) {
var l log.Logger
l, err := cortex_log.NewPrometheusLogger(lvl, fmt)
if err != nil {
return nil, err
}
// There are two wrappers on the log so skip two extra stacks vs default
return log.With(l, "caller", log.Caller(5)), nil
}
// Log logs a log line.
func (l *Logger) Log(kvps ...interface{}) error {
l.mut.RLock()
defer l.mut.RUnlock()
return l.l.Log(kvps...)
}
// GoKitLogger creates a logging.Interface from a log.Logger.
func GoKitLogger(l log.Logger) logging.Interface {
return logging.GoKit(l)
}