/
core.go
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/
core.go
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package zap
import (
"flag"
"io/ioutil"
golog "log"
"os"
"path/filepath"
"strings"
"sync/atomic"
"unsafe"
"github.com/pkg/errors"
"go.uber.org/zap"
"go.uber.org/zap/zapcore"
"go.uber.org/zap/zaptest/observer"
"github.com/ericyaoxr/mcube/file"
"github.com/ericyaoxr/mcube/path"
)
var (
_log unsafe.Pointer // Pointer to a coreLogger. Access via atomic.LoadPointer.
)
// 初始化默认Logger
func init() {
storeLogger(&coreLogger{
selectors: map[string]struct{}{},
rootLogger: zap.NewNop(),
globalLogger: zap.NewNop(),
logger: newLogger(zap.NewNop(), ""),
atom: zap.NewAtomicLevel(),
})
}
type coreLogger struct {
selectors map[string]struct{} // Set of enabled debug selectors.
rootLogger *zap.Logger // Root logger without any options configured.
globalLogger *zap.Logger // Logger used by legacy global functions (e.g. logp.Info).
logger *Logger // Logger that is the basis for all logp.Loggers.
observedLogs *observer.ObservedLogs // Contains events generated while in observation mode (a testing mode).
atom zap.AtomicLevel // 动态Level设置
}
// Configure configures the logp package.
func Configure(cfg Config) error {
var (
sink zapcore.Core
observedLogs *observer.ObservedLogs
err error
)
atom := zap.NewAtomicLevel()
atom.SetLevel(cfg.Level.zapLevel())
// Build a single output (stderr has priority if more than one are enabled).
switch {
case cfg.toObserver:
sink, observedLogs = observer.New(atom)
case cfg.toIODiscard:
sink, err = makeDiscardOutput(cfg, atom)
case cfg.ToStderr:
sink, err = makeStderrOutput(cfg, atom)
case cfg.ToSyslog:
sink, err = makeSyslogOutput(cfg, atom)
case cfg.ToEventLog:
sink, err = makeEventLogOutput(cfg, atom)
case cfg.ToFiles:
fallthrough
default:
sink, err = makeFileOutput(cfg, atom)
}
if err != nil {
return errors.Wrap(err, "failed to build log output")
}
// Enabled selectors when debug is enabled.
selectors := make(map[string]struct{}, len(cfg.Selectors))
if cfg.Level.Enabled(DebugLevel) && len(cfg.Selectors) > 0 {
for _, sel := range cfg.Selectors {
selectors[strings.TrimSpace(sel)] = struct{}{}
}
// Default to all enabled if no selectors are specified.
if len(selectors) == 0 {
selectors["*"] = struct{}{}
}
if _, enabled := selectors["stdlog"]; !enabled {
// Disable standard logging by default (this is sometimes used by
// libraries and we don't want their spam).
golog.SetOutput(ioutil.Discard)
}
sink = selectiveWrapper(sink, selectors)
}
root := zap.New(sink, makeOptions(cfg)...)
storeLogger(&coreLogger{
selectors: selectors,
rootLogger: root,
globalLogger: root.WithOptions(zap.AddCallerSkip(1)),
logger: newLogger(root, ""),
observedLogs: observedLogs,
atom: atom,
})
return nil
}
// DevelopmentSetup configures the logger in development mode at debug level.
// By default the output goes to stderr.
func DevelopmentSetup(options ...Option) error {
cfg := Config{
Level: DebugLevel,
ToStderr: true,
development: true,
addCaller: true,
}
for _, apply := range options {
apply(&cfg)
}
return Configure(cfg)
}
// TestingSetup configures logging by calling DevelopmentSetup if and only if
// verbose testing is enabled (as in 'go test -v').
func TestingSetup(options ...Option) error {
// Use the flag to avoid a dependency on the testing package.
f := flag.Lookup("test.v")
if f != nil && f.Value.String() == "true" {
return DevelopmentSetup(options...)
}
return nil
}
// ObserverLogs provides the list of logs generated during the observation
// process.
func ObserverLogs() *observer.ObservedLogs {
return loadLogger().observedLogs
}
// Sync flushes any buffered log entries. Applications should take care to call
// Sync before exiting.
func Sync() error {
return loadLogger().rootLogger.Sync()
}
func makeOptions(cfg Config) []zap.Option {
var options []zap.Option
if cfg.addCaller {
options = append(options, zap.AddCaller())
}
if cfg.development {
options = append(options, zap.Development())
}
if len(cfg.Metas) > 0 {
options = append(options, zap.Fields(cfg.Metas...))
}
return options
}
func makeStderrOutput(cfg Config, enab zapcore.LevelEnabler) (zapcore.Core, error) {
stderr := zapcore.Lock(os.Stderr)
return zapcore.NewCore(buildEncoder(cfg), stderr, enab), nil
}
func makeDiscardOutput(cfg Config, enab zapcore.LevelEnabler) (zapcore.Core, error) {
discard := zapcore.AddSync(ioutil.Discard)
return zapcore.NewCore(buildEncoder(cfg), discard, enab), nil
}
func makeSyslogOutput(cfg Config, enab zapcore.LevelEnabler) (zapcore.Core, error) {
return newSyslog(buildEncoder(cfg), enab)
}
func makeEventLogOutput(cfg Config, enab zapcore.LevelEnabler) (zapcore.Core, error) {
return newEventLog(cfg.Name, buildEncoder(cfg), enab)
}
func makeFileOutput(cfg Config, enab zapcore.LevelEnabler) (zapcore.Core, error) {
name := cfg.Name
if cfg.Files.Name != "" {
name = cfg.Files.Name
}
filename := path.Resolve(path.Logs, filepath.Join(cfg.Files.Path, name))
rotator, err := file.NewFileRotator(filename,
file.MaxSizeBytes(cfg.Files.MaxSize),
file.MaxBackups(cfg.Files.MaxBackups),
file.Permissions(os.FileMode(cfg.Files.Permissions)),
file.Interval(cfg.Files.Interval),
file.RedirectStderr(cfg.Files.RedirectStderr),
)
if err != nil {
return nil, errors.Wrap(err, "failed to create file rotator")
}
return zapcore.NewCore(buildEncoder(cfg), rotator, enab), nil
}
func globalLogger() *zap.Logger {
return loadLogger().globalLogger
}
func loadLogger() *coreLogger {
p := atomic.LoadPointer(&_log)
return (*coreLogger)(p)
}
func storeLogger(l *coreLogger) {
if old := loadLogger(); old != nil {
old.rootLogger.Sync()
}
atomic.StorePointer(&_log, unsafe.Pointer(l))
}
// HasSelector returns true if the given selector was explicitly set.
func HasSelector(selector string) bool {
_, found := loadLogger().selectors[selector]
return found
}