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glog_config.go
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/
glog_config.go
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// Go support for leveled logs, analogous to https://code.google.com/p/google-glog/
//
// Copyright 2013 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package glog
import (
"errors"
"flag"
"io"
"os"
"strconv"
"strings"
"time"
"golang.org/x/time/rate"
)
func init() {
flag.Var(&logging.verbosity, "v", "log level for V logs")
flag.Var(&logging.vmodule, "vmodule",
"comma-separated list of pattern=N settings for file-filtered logging")
flag.Var(&logging.traceLocation, "log_backtrace_at",
"when logging hits line file:N, emit a stack trace")
logging.toWriter = true
logging.writer = os.Stderr
logging.setVState(0, nil, false)
}
// VGlobal returns the current global verbosity level.
func VGlobal() Level {
// we can't rely on LoadInt32 here because that returns 0 for some time between
// a config set transition, so Locck logging.mu
logging.mu.Lock()
v := logging.verbosity.get()
logging.mu.Unlock()
return v
}
// VModule gets the per-module verosity level.
func VModule() string {
return logging.vmodule.String() // holds logging.mu
}
// SetVGlobal sets the global verbosity level.
func SetVGlobal(v Level) Level {
logging.mu.Lock()
prev, _ := logging.setVState(v, logging.vmodule.filter, false)
logging.mu.Unlock()
return prev
}
var errVmoduleSyntax = errors.New("syntax error: expect comma-separated list of filename=N")
// SetVModule sets the per-module verbosity level.
// Syntax: message=2,routing*=1
func SetVModule(value string) (string, error) {
var filter []modulePat
for _, pat := range strings.Split(value, ",") {
if len(pat) == 0 {
// Empty strings such as from a trailing comma can be ignored.
continue
}
patLev := strings.Split(pat, "=")
if len(patLev) != 2 || len(patLev[0]) == 0 || len(patLev[1]) == 0 {
return "", errVmoduleSyntax
}
pattern := patLev[0]
v, err := strconv.Atoi(patLev[1])
if err != nil {
return "", errors.New("syntax error: expect comma-separated list of filename=N")
}
if v < 0 {
return "", errors.New("negative value for vmodule level")
}
if v == 0 {
// hack: change 0 from flag to -1 here; this will mean to ignore this file
v = -1
}
// TODO: check syntax of filter?
filter = append(filter, modulePat{pattern, isLiteral(pattern), Level(v)})
}
logging.mu.Lock()
_, prev := logging.setVState(logging.verbosity, filter, true)
logging.mu.Unlock()
return specToString(prev), nil
}
// SetOutput sets the writer for log output. By default this is os.StdErr.
// It returns the writer that was previously set.
func SetOutput(w io.Writer) io.Writer {
prev := logging.writer
logging.writer = w
return prev
}
// SetOnFatalFunc sets a function to be called on glog.Fatal() invocation.
// It allows to run some logic to report or track the error before os.Exit.
// It's expected that the passed function doesn't hang (i.e. doing network request)
// as it will halt the termination.
func SetOnFatalFunc(f func([]byte)) {
logging.onFatalFunc = f
}
// limitToDuration is inverse of rate.Every() func.
func limitToDuration(in rate.Limit) time.Duration {
if in == rate.Inf {
return 0
}
seconds := float64(time.Second) * (1 / float64(in))
return time.Duration(seconds)
}
// getRateLimit gets the rate limit config and converts it.
// it does not take logging.mu.
func getRateLimit() (time.Duration, int) {
if logging.rateLimiter == nil {
return 0, 0
}
limit := limitToDuration(logging.rateLimiter.Limit())
burst := logging.rateLimiter.Burst()
return limit, burst
}
// GetRateLimit returns the seconds and burst size for the current rate limiter.
//
// If no rate limit it setup, it will return zero values.
func GetRateLimit() (time.Duration, int) {
logging.mu.Lock()
defer logging.mu.Unlock()
return getRateLimit()
}
// SetRateLimit sets the rate limit in seconds and burst size.
func SetRateLimit(limit time.Duration, burst int) (time.Duration, int) {
logging.mu.Lock()
defer logging.mu.Unlock()
prevL, prevB := getRateLimit()
logging.rateLimiter = rate.NewLimiter(rate.Every(limit), burst)
return prevL, prevB
}