408 lines
10 KiB
Go
408 lines
10 KiB
Go
package logrus
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import (
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"bytes"
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"context"
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"fmt"
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"os"
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"reflect"
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"runtime"
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"strings"
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"sync"
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"time"
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)
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var (
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bufferPool *sync.Pool
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// qualified package name, cached at first use
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logrusPackage string
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// Positions in the call stack when tracing to report the calling method
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minimumCallerDepth int
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// Used for caller information initialisation
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callerInitOnce sync.Once
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)
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const (
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maximumCallerDepth int = 25
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knownLogrusFrames int = 4
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)
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func init() {
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bufferPool = &sync.Pool{
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New: func() interface{} {
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return new(bytes.Buffer)
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},
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}
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// start at the bottom of the stack before the package-name cache is primed
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minimumCallerDepth = 1
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}
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// Defines the key when adding errors using WithError.
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var ErrorKey = "error"
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// An entry is the final or intermediate Logrus logging entry. It contains all
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// the fields passed with WithField{,s}. It's finally logged when Trace, Debug,
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// Info, Warn, Error, Fatal or Panic is called on it. These objects can be
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// reused and passed around as much as you wish to avoid field duplication.
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type Entry struct {
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Logger *Logger
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// Contains all the fields set by the user.
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Data Fields
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// Time at which the log entry was created
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Time time.Time
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// Level the log entry was logged at: Trace, Debug, Info, Warn, Error, Fatal or Panic
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// This field will be set on entry firing and the value will be equal to the one in Logger struct field.
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Level Level
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// Calling method, with package name
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Caller *runtime.Frame
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// Message passed to Trace, Debug, Info, Warn, Error, Fatal or Panic
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Message string
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// When formatter is called in entry.log(), a Buffer may be set to entry
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Buffer *bytes.Buffer
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// Contains the context set by the user. Useful for hook processing etc.
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Context context.Context
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// err may contain a field formatting error
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err string
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}
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func NewEntry(logger *Logger) *Entry {
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return &Entry{
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Logger: logger,
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// Default is three fields, plus one optional. Give a little extra room.
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Data: make(Fields, 6),
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}
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}
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// Returns the string representation from the reader and ultimately the
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// formatter.
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func (entry *Entry) String() (string, error) {
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serialized, err := entry.Logger.Formatter.Format(entry)
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if err != nil {
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return "", err
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}
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str := string(serialized)
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return str, nil
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}
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// Add an error as single field (using the key defined in ErrorKey) to the Entry.
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func (entry *Entry) WithError(err error) *Entry {
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return entry.WithField(ErrorKey, err)
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}
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// Add a context to the Entry.
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func (entry *Entry) WithContext(ctx context.Context) *Entry {
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return &Entry{Logger: entry.Logger, Data: entry.Data, Time: entry.Time, err: entry.err, Context: ctx}
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}
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// Add a single field to the Entry.
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func (entry *Entry) WithField(key string, value interface{}) *Entry {
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return entry.WithFields(Fields{key: value})
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}
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// Add a map of fields to the Entry.
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func (entry *Entry) WithFields(fields Fields) *Entry {
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data := make(Fields, len(entry.Data)+len(fields))
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for k, v := range entry.Data {
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data[k] = v
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}
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fieldErr := entry.err
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for k, v := range fields {
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isErrField := false
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if t := reflect.TypeOf(v); t != nil {
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switch t.Kind() {
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case reflect.Func:
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isErrField = true
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case reflect.Ptr:
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isErrField = t.Elem().Kind() == reflect.Func
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}
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}
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if isErrField {
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tmp := fmt.Sprintf("can not add field %q", k)
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if fieldErr != "" {
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fieldErr = entry.err + ", " + tmp
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} else {
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fieldErr = tmp
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}
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} else {
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data[k] = v
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}
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}
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return &Entry{Logger: entry.Logger, Data: data, Time: entry.Time, err: fieldErr, Context: entry.Context}
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}
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// Overrides the time of the Entry.
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func (entry *Entry) WithTime(t time.Time) *Entry {
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return &Entry{Logger: entry.Logger, Data: entry.Data, Time: t, err: entry.err, Context: entry.Context}
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}
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// getPackageName reduces a fully qualified function name to the package name
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// There really ought to be to be a better way...
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func getPackageName(f string) string {
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for {
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lastPeriod := strings.LastIndex(f, ".")
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lastSlash := strings.LastIndex(f, "/")
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if lastPeriod > lastSlash {
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f = f[:lastPeriod]
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} else {
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break
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}
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}
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return f
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}
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// getCaller retrieves the name of the first non-logrus calling function
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func getCaller() *runtime.Frame {
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// cache this package's fully-qualified name
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callerInitOnce.Do(func() {
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pcs := make([]uintptr, 2)
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_ = runtime.Callers(0, pcs)
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logrusPackage = getPackageName(runtime.FuncForPC(pcs[1]).Name())
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// now that we have the cache, we can skip a minimum count of known-logrus functions
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// XXX this is dubious, the number of frames may vary
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minimumCallerDepth = knownLogrusFrames
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})
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// Restrict the lookback frames to avoid runaway lookups
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pcs := make([]uintptr, maximumCallerDepth)
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depth := runtime.Callers(minimumCallerDepth, pcs)
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frames := runtime.CallersFrames(pcs[:depth])
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for f, again := frames.Next(); again; f, again = frames.Next() {
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pkg := getPackageName(f.Function)
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// If the caller isn't part of this package, we're done
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if pkg != logrusPackage {
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return &f
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}
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}
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// if we got here, we failed to find the caller's context
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return nil
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}
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func (entry Entry) HasCaller() (has bool) {
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return entry.Logger != nil &&
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entry.Logger.ReportCaller &&
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entry.Caller != nil
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}
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// This function is not declared with a pointer value because otherwise
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// race conditions will occur when using multiple goroutines
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func (entry Entry) log(level Level, msg string) {
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var buffer *bytes.Buffer
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// Default to now, but allow users to override if they want.
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//
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// We don't have to worry about polluting future calls to Entry#log()
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// with this assignment because this function is declared with a
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// non-pointer receiver.
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if entry.Time.IsZero() {
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entry.Time = time.Now()
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}
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entry.Level = level
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entry.Message = msg
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if entry.Logger.ReportCaller {
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entry.Caller = getCaller()
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}
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entry.fireHooks()
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buffer = bufferPool.Get().(*bytes.Buffer)
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buffer.Reset()
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defer bufferPool.Put(buffer)
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entry.Buffer = buffer
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entry.write()
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entry.Buffer = nil
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// To avoid Entry#log() returning a value that only would make sense for
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// panic() to use in Entry#Panic(), we avoid the allocation by checking
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// directly here.
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if level <= PanicLevel {
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panic(&entry)
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}
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}
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func (entry *Entry) fireHooks() {
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entry.Logger.mu.Lock()
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defer entry.Logger.mu.Unlock()
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err := entry.Logger.Hooks.Fire(entry.Level, entry)
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if err != nil {
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fmt.Fprintf(os.Stderr, "Failed to fire hook: %v\n", err)
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}
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}
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func (entry *Entry) write() {
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entry.Logger.mu.Lock()
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defer entry.Logger.mu.Unlock()
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serialized, err := entry.Logger.Formatter.Format(entry)
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if err != nil {
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fmt.Fprintf(os.Stderr, "Failed to obtain reader, %v\n", err)
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} else {
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_, err = entry.Logger.Out.Write(serialized)
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if err != nil {
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fmt.Fprintf(os.Stderr, "Failed to write to log, %v\n", err)
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}
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}
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}
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func (entry *Entry) Log(level Level, args ...interface{}) {
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if entry.Logger.IsLevelEnabled(level) {
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entry.log(level, fmt.Sprint(args...))
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}
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}
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func (entry *Entry) Trace(args ...interface{}) {
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entry.Log(TraceLevel, args...)
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}
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func (entry *Entry) Debug(args ...interface{}) {
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entry.Log(DebugLevel, args...)
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}
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func (entry *Entry) Print(args ...interface{}) {
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entry.Info(args...)
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}
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func (entry *Entry) Info(args ...interface{}) {
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entry.Log(InfoLevel, args...)
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}
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func (entry *Entry) Warn(args ...interface{}) {
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entry.Log(WarnLevel, args...)
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}
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func (entry *Entry) Warning(args ...interface{}) {
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entry.Warn(args...)
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}
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func (entry *Entry) Error(args ...interface{}) {
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entry.Log(ErrorLevel, args...)
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}
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func (entry *Entry) Fatal(args ...interface{}) {
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entry.Log(FatalLevel, args...)
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entry.Logger.Exit(1)
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}
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func (entry *Entry) Panic(args ...interface{}) {
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entry.Log(PanicLevel, args...)
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panic(fmt.Sprint(args...))
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}
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// Entry Printf family functions
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func (entry *Entry) Logf(level Level, format string, args ...interface{}) {
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if entry.Logger.IsLevelEnabled(level) {
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entry.Log(level, fmt.Sprintf(format, args...))
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}
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}
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func (entry *Entry) Tracef(format string, args ...interface{}) {
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entry.Logf(TraceLevel, format, args...)
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}
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func (entry *Entry) Debugf(format string, args ...interface{}) {
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entry.Logf(DebugLevel, format, args...)
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}
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func (entry *Entry) Infof(format string, args ...interface{}) {
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entry.Logf(InfoLevel, format, args...)
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}
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func (entry *Entry) Printf(format string, args ...interface{}) {
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entry.Infof(format, args...)
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}
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func (entry *Entry) Warnf(format string, args ...interface{}) {
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entry.Logf(WarnLevel, format, args...)
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}
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func (entry *Entry) Warningf(format string, args ...interface{}) {
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entry.Warnf(format, args...)
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}
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func (entry *Entry) Errorf(format string, args ...interface{}) {
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entry.Logf(ErrorLevel, format, args...)
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}
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func (entry *Entry) Fatalf(format string, args ...interface{}) {
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entry.Logf(FatalLevel, format, args...)
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entry.Logger.Exit(1)
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}
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func (entry *Entry) Panicf(format string, args ...interface{}) {
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entry.Logf(PanicLevel, format, args...)
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}
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// Entry Println family functions
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func (entry *Entry) Logln(level Level, args ...interface{}) {
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if entry.Logger.IsLevelEnabled(level) {
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entry.Log(level, entry.sprintlnn(args...))
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}
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}
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func (entry *Entry) Traceln(args ...interface{}) {
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entry.Logln(TraceLevel, args...)
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}
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func (entry *Entry) Debugln(args ...interface{}) {
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entry.Logln(DebugLevel, args...)
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}
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func (entry *Entry) Infoln(args ...interface{}) {
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entry.Logln(InfoLevel, args...)
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}
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func (entry *Entry) Println(args ...interface{}) {
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entry.Infoln(args...)
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}
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func (entry *Entry) Warnln(args ...interface{}) {
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entry.Logln(WarnLevel, args...)
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}
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func (entry *Entry) Warningln(args ...interface{}) {
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entry.Warnln(args...)
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}
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func (entry *Entry) Errorln(args ...interface{}) {
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entry.Logln(ErrorLevel, args...)
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}
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func (entry *Entry) Fatalln(args ...interface{}) {
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entry.Logln(FatalLevel, args...)
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entry.Logger.Exit(1)
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}
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func (entry *Entry) Panicln(args ...interface{}) {
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entry.Logln(PanicLevel, args...)
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}
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// Sprintlnn => Sprint no newline. This is to get the behavior of how
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// fmt.Sprintln where spaces are always added between operands, regardless of
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// their type. Instead of vendoring the Sprintln implementation to spare a
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// string allocation, we do the simplest thing.
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func (entry *Entry) sprintlnn(args ...interface{}) string {
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msg := fmt.Sprintln(args...)
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return msg[:len(msg)-1]
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}
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