Documentation ¶
Overview ¶
Package glog implements logging analogous to the Google-internal C++ INFO/ERROR/V setup. It provides functions Info, Warning, Error, Fatal, plus formatting variants such as Infof. It also provides V-style logging controlled by the -v and -vmodule=file=2 flags.
Basic examples:
glog.Info("Prepare to repel boarders") glog.Fatalf("Initialization failed: %s", err)
See the documentation for the V function for an explanation of these examples:
if glog.V(2) { glog.Info("Starting transaction...") } glog.V(2).Infoln("Processed", nItems, "elements")
Log output is buffered and written periodically using Flush. Programs should call Flush before exiting to guarantee all log output is written.
By default, all log statements write to files in a temporary directory. This package provides several flags that modify this behavior. As a result, flag.Parse must be called before any logging is done.
-logtostderr=false Logs are written to standard error instead of to files. -alsologtostderr=false Logs are written to standard error as well as to files. -stderrthreshold=ERROR Log events at or above this severity are logged to standard error as well as to files. -log_dir="" Log files will be written to this directory instead of the default temporary directory. Other flags provide aids to debugging. -log_backtrace_at="" When set to a file and line number holding a logging statement, such as -log_backtrace_at=gopherflakes.go:234 a stack trace will be written to the Info log whenever execution hits that statement. (Unlike with -vmodule, the ".go" must be present.) -v=0 Enable V-leveled logging at the specified level. -vmodule="" The syntax of the argument is a comma-separated list of pattern=N, where pattern is a literal file name (minus the ".go" suffix) or "glob" pattern and N is a V level. For instance, -vmodule=gopher*=3 sets the V level to 3 in all Go files whose names begin "gopher".
Index ¶
- Variables
- func CopyStandardLogTo(name string)
- func Error(args ...interface{})
- func ErrorDepth(depth int, args ...interface{})
- func Errorf(format string, args ...interface{})
- func Errorln(args ...interface{})
- func Exit(args ...interface{})
- func ExitDepth(depth int, args ...interface{})
- func Exitf(format string, args ...interface{})
- func Exitln(args ...interface{})
- func Fatal(args ...interface{})
- func FatalDepth(depth int, args ...interface{})
- func Fatalf(format string, args ...interface{})
- func Fatalln(args ...interface{})
- func Flush()
- func Info(args ...interface{})
- func InfoDepth(depth int, args ...interface{})
- func Infof(format string, args ...interface{})
- func Infoln(args ...interface{})
- func Init(options Options) error
- func Warning(args ...interface{})
- func WarningDepth(depth int, args ...interface{})
- func Warningf(format string, args ...interface{})
- func Warningln(args ...interface{})
- type Cglog
- func (c *Cglog) Debug(level int, args ...interface{})
- func (c *Cglog) Debugf(level int, format string, args ...interface{})
- func (c *Cglog) Debugln(level int, args ...interface{})
- func (c *Cglog) Error(args ...interface{})
- func (c *Cglog) Errorf(format string, args ...interface{})
- func (c *Cglog) Errorln(args ...interface{})
- func (c *Cglog) Fatal(args ...interface{})
- func (c *Cglog) Fatalf(format string, args ...interface{})
- func (c *Cglog) Fatalln(args ...interface{})
- func (c *Cglog) Info(args ...interface{})
- func (c *Cglog) Infof(format string, args ...interface{})
- func (c *Cglog) Infoln(args ...interface{})
- func (c *Cglog) SetDebug(level int)
- func (c *Cglog) Warning(args ...interface{})
- func (c *Cglog) Warningf(format string, args ...interface{})
- func (c *Cglog) Warningln(args ...interface{})
- type Level
- type Option
- type Options
- type OutputStats
- type Verbose
Constants ¶
This section is empty.
Variables ¶
var ErrAlreadyInitialized = errors.New("already initialized")
ErrAlreadyInitialized is returned by Init() if glog is already initialized.
var MaxSize uint64 = 1024 * 1024 * 10
MaxSize is the maximum size of a log file in bytes.
var Stats struct { Info, Warning, Error OutputStats }
Stats tracks the number of lines of output and number of bytes per severity level. Values must be read with atomic.LoadInt64.
Functions ¶
func CopyStandardLogTo ¶
func CopyStandardLogTo(name string)
CopyStandardLogTo arranges for messages written to the Go "log" package's default logs to also appear in the Google logs for the named and lower severities. Subsequent changes to the standard log's default output location or format may break this behavior.
Valid names are "INFO", "WARNING", "ERROR", and "FATAL". If the name is not recognized, CopyStandardLogTo panics.
func Error ¶
func Error(args ...interface{})
Error logs to the ERROR, WARNING, and INFO logs. Arguments are handled in the manner of fmt.Print; a newline is appended if missing.
func ErrorDepth ¶
func ErrorDepth(depth int, args ...interface{})
ErrorDepth acts as Error but uses depth to determine which call frame to log. ErrorDepth(0, "msg") is the same as Error("msg").
func Errorf ¶
func Errorf(format string, args ...interface{})
Errorf logs to the ERROR, WARNING, and INFO logs. Arguments are handled in the manner of fmt.Printf; a newline is appended if missing.
func Errorln ¶
func Errorln(args ...interface{})
Errorln logs to the ERROR, WARNING, and INFO logs. Arguments are handled in the manner of fmt.Println; a newline is appended if missing.
func Exit ¶
func Exit(args ...interface{})
Exit logs to the FATAL, ERROR, WARNING, and INFO logs, then calls os.Exit(1). Arguments are handled in the manner of fmt.Print; a newline is appended if missing.
func ExitDepth ¶
func ExitDepth(depth int, args ...interface{})
ExitDepth acts as Exit but uses depth to determine which call frame to log. ExitDepth(0, "msg") is the same as Exit("msg").
func Exitf ¶
func Exitf(format string, args ...interface{})
Exitf logs to the FATAL, ERROR, WARNING, and INFO logs, then calls os.Exit(1). Arguments are handled in the manner of fmt.Printf; a newline is appended if missing.
func Exitln ¶
func Exitln(args ...interface{})
Exitln logs to the FATAL, ERROR, WARNING, and INFO logs, then calls os.Exit(1).
func Fatal ¶
func Fatal(args ...interface{})
Fatal logs to the FATAL, ERROR, WARNING, and INFO logs, including a stack trace of all running goroutines, then calls os.Exit(255). Arguments are handled in the manner of fmt.Print; a newline is appended if missing.
func FatalDepth ¶
func FatalDepth(depth int, args ...interface{})
FatalDepth acts as Fatal but uses depth to determine which call frame to log. FatalDepth(0, "msg") is the same as Fatal("msg").
func Fatalf ¶
func Fatalf(format string, args ...interface{})
Fatalf logs to the FATAL, ERROR, WARNING, and INFO logs, including a stack trace of all running goroutines, then calls os.Exit(255). Arguments are handled in the manner of fmt.Printf; a newline is appended if missing.
func Fatalln ¶
func Fatalln(args ...interface{})
Fatalln logs to the FATAL, ERROR, WARNING, and INFO logs, including a stack trace of all running goroutines, then calls os.Exit(255). Arguments are handled in the manner of fmt.Println; a newline is appended if missing.
func Info ¶
func Info(args ...interface{})
Info logs to the INFO log. Arguments are handled in the manner of fmt.Print; a newline is appended if missing.
func InfoDepth ¶
func InfoDepth(depth int, args ...interface{})
InfoDepth acts as Info but uses depth to determine which call frame to log. InfoDepth(0, "msg") is the same as Info("msg").
func Infof ¶
func Infof(format string, args ...interface{})
Infof logs to the INFO log. Arguments are handled in the manner of fmt.Printf; a newline is appended if missing.
func Infoln ¶
func Infoln(args ...interface{})
Infoln logs to the INFO log. Arguments are handled in the manner of fmt.Println; a newline is appended if missing.
func Init ¶
Init initializes glog with the given options. Don’t call any glog functions before calling the glog.Init() function. Returns ErrAlreadyInitialized if called more than once.
func Warning ¶
func Warning(args ...interface{})
Warning logs to the WARNING and INFO logs. Arguments are handled in the manner of fmt.Print; a newline is appended if missing.
func WarningDepth ¶
func WarningDepth(depth int, args ...interface{})
WarningDepth acts as Warning but uses depth to determine which call frame to log. WarningDepth(0, "msg") is the same as Warning("msg").
Types ¶
type Cglog ¶ added in v0.0.2
type Cglog struct {
// contains filtered or unexported fields
}
func New ¶ added in v0.0.2
New returns a Cglog instance that will print the tag in front of the message.
func (*Cglog) Debug ¶ added in v0.0.2
Debug logs to the INFO log. Arguments are handled in the manner of fmt.Print; a newline is appended if missing.
func (*Cglog) Debugf ¶ added in v0.0.2
Debugf logs to the INFO log. Arguments are handled in the manner of fmt.Printf; a newline is appended if missing.
func (*Cglog) Debugln ¶ added in v0.0.2
Debugln logs to the INFO log. Arguments are handled in the manner of fmt.Println; a newline is appended if missing.
func (*Cglog) Error ¶ added in v0.0.2
func (c *Cglog) Error(args ...interface{})
Error logs to the ERROR, WARNING, and INFO logs. Arguments are handled in the manner of fmt.Print; a newline is appended if missing.
func (*Cglog) Errorf ¶ added in v0.0.2
Errorf logs to the ERROR, WARNING, and INFO logs. Arguments are handled in the manner of fmt.Printf; a newline is appended if missing.
func (*Cglog) Errorln ¶ added in v0.0.2
func (c *Cglog) Errorln(args ...interface{})
Errorln logs to the ERROR, WARNING, and INFO logs. Arguments are handled in the manner of fmt.Println; a newline is appended if missing.
func (*Cglog) Fatal ¶ added in v0.0.2
func (c *Cglog) Fatal(args ...interface{})
Fatal logs to the FATAL, ERROR, WARNING, and INFO logs, including a stack trace of all running goroutines, then calls os.Exit(255). Arguments are handled in the manner of fmt.Print; a newline is appended if missing.
func (*Cglog) Fatalf ¶ added in v0.0.2
Fatalf logs to the FATAL, ERROR, WARNING, and INFO logs, including a stack trace of all running goroutines, then calls os.Exit(255). Arguments are handled in the manner of fmt.Printf; a newline is appended if missing.
func (*Cglog) Fatalln ¶ added in v0.0.2
func (c *Cglog) Fatalln(args ...interface{})
Fatalln logs to the FATAL, ERROR, WARNING, and INFO logs, including a stack trace of all running goroutines, then calls os.Exit(255). Arguments are handled in the manner of fmt.Println; a newline is appended if missing.
func (*Cglog) Info ¶ added in v0.0.2
func (c *Cglog) Info(args ...interface{})
Info logs to the INFO log. Arguments are handled in the manner of fmt.Print; a newline is appended if missing.
func (*Cglog) Infof ¶ added in v0.0.2
Infof logs to the INFO log. Arguments are handled in the manner of fmt.Printf; a newline is appended if missing.
func (*Cglog) Infoln ¶ added in v0.0.2
func (c *Cglog) Infoln(args ...interface{})
Infoln logs to the INFO log. Arguments are handled in the manner of fmt.Println; a newline is appended if missing.
func (*Cglog) Warning ¶ added in v0.0.2
func (c *Cglog) Warning(args ...interface{})
Warning logs to the WARNING and INFO logs. Arguments are handled in the manner of fmt.Print; a newline is appended if missing.
type Level ¶
type Level int32
Level specifies a level of verbosity for V logs. *Level implements flag.Value; the -v flag is of type Level and should be modified only through the flag.Value interface.
type Options ¶
type Options struct { // ToStdErr is true to log to stderr instead of files. ToStdErr bool `json:"toStdErr,omitempty"` // AlsoToStdErr is true to log to stderr and to files. AlsoToStdErr bool `json:"alsoToStdErr,omitempty"` // Verbosity sets the log level for V logs (e.g. 3). Verbosity int `json:"verbosity,omitempty"` // StdErrThreshold set the stderr output threshold to "info", "warning", "error" or "fatal" (default: error). StdErrThreshold string `json:"stdErrThreshold,omitempty"` // VModule sets the verbose level per file. V is comma-separated list of pattern=N settings for file-filtered logging. // pattern may be a file name (without .go) or a file with wildcard (e.g. gtx*=2). VModule string `json:"vmodule,omitempty"` // TraceLocation sets a backtrace logging when logging hits line file:N. TraceLocation string `json:"traceLocation,omitempty"` // LogDir sets the log output directory (default is /tmp). Create the directory if it doesn’t exist. LogDir string `json:"logdir"` // MaxSize is the maximum byte size of a log file triggiring rotation (default: 10MB). MaxSize int `json:"maxLogFileLen,omitempty"` }
type OutputStats ¶
type OutputStats struct {
// contains filtered or unexported fields
}
OutputStats tracks the number of output lines and bytes written.
func (*OutputStats) Bytes ¶
func (s *OutputStats) Bytes() int64
Bytes returns the number of bytes written.
func (*OutputStats) Lines ¶
func (s *OutputStats) Lines() int64
Lines returns the number of lines written.
type Verbose ¶
type Verbose bool
Verbose is a boolean type that implements Infof (like Printf) etc. See the documentation of V for more information.
func V ¶
V reports whether verbosity at the call site is at least the requested level. The returned value is a boolean of type Verbose, which implements Info, Infoln and Infof. These methods will write to the Info log if called. Thus, one may write either
if glog.V(2) { glog.Info("log this") }
or
glog.V(2).Info("log this")
The second form is shorter but the first is cheaper if logging is off because it does not evaluate its arguments.
Whether an individual call to V generates a log record depends on the setting of the -v and --vmodule flags; both are off by default. If the level in the call to V is at least the value of -v, or of -vmodule for the source file containing the call, the V call will log.
func (Verbose) Info ¶
func (v Verbose) Info(args ...interface{})
Info is equivalent to the global Info function, guarded by the value of v. See the documentation of V for usage.