@@ 24,28 24,39 @@ package main
import (
"flag"
+ "fmt"
+ "log"
+ "net"
"net/http"
"os"
"path"
+ "path/filepath"
"strings"
-
- "github.com/golang/glog"
)
-var allowedPaths = map[string]string{}
-var prefix = "/"
+var (
+ accessLogs bool
+ allowedPaths = map[string]string{}
+ prefix = "/"
+)
func main() {
- addr := flag.String("listen", "127.0.0.1:8080", "Listen address")
- fprefix := flag.String("prefix", "/", "Prefix to expect and strip from paths.")
- flag.CommandLine.Parse(append([]string{"-logtostderr"}, os.Args[1:]...))
+ log.SetFlags(log.LstdFlags | log.LUTC | log.Lmsgprefix)
+ fs := flag.NewFlagSet("fsv", flag.ExitOnError)
+ addr := fs.String("listen", "127.0.0.1:8080", "Listen address")
+ fs.StringVar(addr, "L", *addr, "Listen address")
+ fprefix := fs.String("prefix", "/", "Prefix to expect and strip from paths.")
+ fs.StringVar(fprefix, "P", *fprefix, "Prefix to expect and strip from paths.")
+ fs.BoolVar(&accessLogs, "A", accessLogs, "Print access logs")
+ fs.BoolVar(&accessLogs, "access-logs", accessLogs, "Print access logs")
+ fs.Parse(os.Args[1:])
prefix = *fprefix
if !strings.HasPrefix(prefix, "/") {
prefix = "/" + prefix
}
- for _, p := range flag.Args() {
+ for _, p := range fs.Args() {
var accept string
if sep := strings.IndexByte(p, ':'); sep != -1 {
p, accept = p[:sep], p[sep+1:]
@@ 59,15 70,36 @@ func main() {
} else if strings.HasSuffix(prefix, "/") && sub == "/" {
sub = prefix
} else {
- sub = prefix + sub
+ subp := sub
+ if len(subp) > 1 {
+ subp = strings.TrimPrefix(subp, "/")
+ }
+ subp = path.Join(prefix, subp)
+ if !path.IsAbs(subp) || subp == "" {
+ panic(fmt.Errorf("Invalid path %q for arg %q", sub, p))
+ }
+ sub = subp
}
allowedPaths[sub] = p
- glog.Infof("Serving %q from %q", p, sub)
+ log.Printf("Serving %q from %q", p, sub)
}
}
- http.ListenAndServe(*addr, http.HandlerFunc(serve))
+ l, err := net.Listen("tcp", *addr)
+ if err != nil {
+ panic(err)
+ }
+ defer l.Close()
+
+ log.Printf("Listening on %v", l.Addr())
+
+ sv := &http.Server{
+ Handler: http.HandlerFunc(serve),
+ }
+ if err := sv.Serve(l); err != nil {
+ log.Fatalf("Fatal error: %v", err)
+ }
}
type responseCoder struct {
@@ 92,18 124,20 @@ func (r *responseCoder) Write(p []byte) (int, error) {
}
func serve(w http.ResponseWriter, r *http.Request) {
- if glog.V(1) {
+ if accessLogs {
rc := &responseCoder{ResponseWriter: w}
w = rc
defer func() {
- glog.Infof("%d %q %q %q %q", rc.code, r.RemoteAddr, r.Header["X-Forwarded-For"], r.Method, r.URL)
+ log.Printf("%d %q %q %q %q", rc.code, r.RemoteAddr, r.Header["X-Forwarded-For"], r.Method, r.URL)
}()
}
- fp, ok := allowedPaths[r.URL.Path]
- if !ok {
- glog.Infof("404\t%q\t%q", r.Method, r.URL)
+
+ p := path.Clean(r.URL.Path)
+ fp, ok := allowedPaths[p]
+ if p == ".." || strings.HasPrefix(p, "../") || p == "" || !ok {
http.NotFound(w, r)
return
}
+ fp = filepath.FromSlash(fp)
http.ServeFile(w, r, fp)
}
@@ 1,191 0,0 @@
-Apache License
-Version 2.0, January 2004
-http://www.apache.org/licenses/
-
-TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
-
-1. Definitions.
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-owner that is granting the License.
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-"Legal Entity" shall mean the union of the acting entity and all other entities
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-For the purposes of this definition, "control" means (i) the power, direct or
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-outstanding shares, or (iii) beneficial ownership of such entity.
-
-"You" (or "Your") shall mean an individual or Legal Entity exercising
-permissions granted by this License.
-
-"Source" form shall mean the preferred form for making modifications, including
-but not limited to software source code, documentation source, and configuration
-files.
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-"Object" form shall mean any form resulting from mechanical transformation or
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-
-"Work" shall mean the work of authorship, whether in Source or Object form, made
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-in or attached to the work (an example is provided in the Appendix below).
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-"Derivative Works" shall mean any work, whether in Source or Object form, that
-is based on (or derived from) the Work and for which the editorial revisions,
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-original work of authorship. For the purposes of this License, Derivative Works
-shall not include works that remain separable from, or merely link (or bind by
-name) to the interfaces of, the Work and Derivative Works thereof.
-
-"Contribution" shall mean any work of authorship, including the original version
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-thereof, that is intentionally submitted to Licensor for inclusion in the Work
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-the purpose of discussing and improving the Work, but excluding communication
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-the NOTICE file are for informational purposes only and do not modify the
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-You distribute, alongside or as an addendum to the NOTICE text from the Work,
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-additional or different license terms and conditions for use, reproduction, or
-distribution of Your modifications, or for any such Derivative Works as a whole,
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-
-5. Submission of Contributions.
-
-Unless You explicitly state otherwise, any Contribution intentionally submitted
-for inclusion in the Work by You to the Licensor shall be under the terms and
-conditions of this License, without any additional terms or conditions.
-Notwithstanding the above, nothing herein shall supersede or modify the terms of
-any separate license agreement you may have executed with Licensor regarding
-such Contributions.
-
-6. Trademarks.
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-This License does not grant permission to use the trade names, trademarks,
-service marks, or product names of the Licensor, except as required for
-reasonable and customary use in describing the origin of the Work and
-reproducing the content of the NOTICE file.
-
-7. Disclaimer of Warranty.
-
-Unless required by applicable law or agreed to in writing, Licensor provides the
-Work (and each Contributor provides its Contributions) on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied,
-including, without limitation, any warranties or conditions of TITLE,
-NON-INFRINGEMENT, MERCHANTABILITY, or FITNESS FOR A PARTICULAR PURPOSE. You are
-solely responsible for determining the appropriateness of using or
-redistributing the Work and assume any risks associated with Your exercise of
-permissions under this License.
-
-8. Limitation of Liability.
-
-In no event and under no legal theory, whether in tort (including negligence),
-contract, or otherwise, unless required by applicable law (such as deliberate
-and grossly negligent acts) or agreed to in writing, shall any Contributor be
-liable to You for damages, including any direct, indirect, special, incidental,
-or consequential damages of any character arising as a result of this License or
-out of the use or inability to use the Work (including but not limited to
-damages for loss of goodwill, work stoppage, computer failure or malfunction, or
-any and all other commercial damages or losses), even if such Contributor has
-been advised of the possibility of such damages.
-
-9. Accepting Warranty or Additional Liability.
-
-While redistributing the Work or Derivative Works thereof, You may choose to
-offer, and charge a fee for, acceptance of support, warranty, indemnity, or
-other liability obligations and/or rights consistent with this License. However,
-in accepting such obligations, You may act only on Your own behalf and on Your
-sole responsibility, not on behalf of any other Contributor, and only if You
-agree to indemnify, defend, and hold each Contributor harmless for any liability
-incurred by, or claims asserted against, such Contributor by reason of your
-accepting any such warranty or additional liability.
-
-END OF TERMS AND CONDITIONS
-
-APPENDIX: How to apply the Apache License to your work
-
-To apply the Apache License to your work, attach the following boilerplate
-notice, with the fields enclosed by brackets "[]" replaced with your own
-identifying information. (Don't include the brackets!) The text should be
-enclosed in the appropriate comment syntax for the file format. We also
-recommend that a file or class name and description of purpose be included on
-the same "printed page" as the copyright notice for easier identification within
-third-party archives.
-
- Copyright [yyyy] [name of copyright owner]
-
- 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.
@@ 1,1180 0,0 @@
-// 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 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".
-//
-package glog
-
-import (
- "bufio"
- "bytes"
- "errors"
- "flag"
- "fmt"
- "io"
- stdLog "log"
- "os"
- "path/filepath"
- "runtime"
- "strconv"
- "strings"
- "sync"
- "sync/atomic"
- "time"
-)
-
-// severity identifies the sort of log: info, warning etc. It also implements
-// the flag.Value interface. The -stderrthreshold flag is of type severity and
-// should be modified only through the flag.Value interface. The values match
-// the corresponding constants in C++.
-type severity int32 // sync/atomic int32
-
-// These constants identify the log levels in order of increasing severity.
-// A message written to a high-severity log file is also written to each
-// lower-severity log file.
-const (
- infoLog severity = iota
- warningLog
- errorLog
- fatalLog
- numSeverity = 4
-)
-
-const severityChar = "IWEF"
-
-var severityName = []string{
- infoLog: "INFO",
- warningLog: "WARNING",
- errorLog: "ERROR",
- fatalLog: "FATAL",
-}
-
-// get returns the value of the severity.
-func (s *severity) get() severity {
- return severity(atomic.LoadInt32((*int32)(s)))
-}
-
-// set sets the value of the severity.
-func (s *severity) set(val severity) {
- atomic.StoreInt32((*int32)(s), int32(val))
-}
-
-// String is part of the flag.Value interface.
-func (s *severity) String() string {
- return strconv.FormatInt(int64(*s), 10)
-}
-
-// Get is part of the flag.Value interface.
-func (s *severity) Get() interface{} {
- return *s
-}
-
-// Set is part of the flag.Value interface.
-func (s *severity) Set(value string) error {
- var threshold severity
- // Is it a known name?
- if v, ok := severityByName(value); ok {
- threshold = v
- } else {
- v, err := strconv.Atoi(value)
- if err != nil {
- return err
- }
- threshold = severity(v)
- }
- logging.stderrThreshold.set(threshold)
- return nil
-}
-
-func severityByName(s string) (severity, bool) {
- s = strings.ToUpper(s)
- for i, name := range severityName {
- if name == s {
- return severity(i), true
- }
- }
- return 0, false
-}
-
-// OutputStats tracks the number of output lines and bytes written.
-type OutputStats struct {
- lines int64
- bytes int64
-}
-
-// Lines returns the number of lines written.
-func (s *OutputStats) Lines() int64 {
- return atomic.LoadInt64(&s.lines)
-}
-
-// Bytes returns the number of bytes written.
-func (s *OutputStats) Bytes() int64 {
- return atomic.LoadInt64(&s.bytes)
-}
-
-// Stats tracks the number of lines of output and number of bytes
-// per severity level. Values must be read with atomic.LoadInt64.
-var Stats struct {
- Info, Warning, Error OutputStats
-}
-
-var severityStats = [numSeverity]*OutputStats{
- infoLog: &Stats.Info,
- warningLog: &Stats.Warning,
- errorLog: &Stats.Error,
-}
-
-// Level is exported because it appears in the arguments to V and is
-// the type of the v flag, which can be set programmatically.
-// It's a distinct type because we want to discriminate it from logType.
-// Variables of type level are only changed under logging.mu.
-// The -v flag is read only with atomic ops, so the state of the logging
-// module is consistent.
-
-// Level is treated as a sync/atomic 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 Level int32
-
-// get returns the value of the Level.
-func (l *Level) get() Level {
- return Level(atomic.LoadInt32((*int32)(l)))
-}
-
-// set sets the value of the Level.
-func (l *Level) set(val Level) {
- atomic.StoreInt32((*int32)(l), int32(val))
-}
-
-// String is part of the flag.Value interface.
-func (l *Level) String() string {
- return strconv.FormatInt(int64(*l), 10)
-}
-
-// Get is part of the flag.Value interface.
-func (l *Level) Get() interface{} {
- return *l
-}
-
-// Set is part of the flag.Value interface.
-func (l *Level) Set(value string) error {
- v, err := strconv.Atoi(value)
- if err != nil {
- return err
- }
- logging.mu.Lock()
- defer logging.mu.Unlock()
- logging.setVState(Level(v), logging.vmodule.filter, false)
- return nil
-}
-
-// moduleSpec represents the setting of the -vmodule flag.
-type moduleSpec struct {
- filter []modulePat
-}
-
-// modulePat contains a filter for the -vmodule flag.
-// It holds a verbosity level and a file pattern to match.
-type modulePat struct {
- pattern string
- literal bool // The pattern is a literal string
- level Level
-}
-
-// match reports whether the file matches the pattern. It uses a string
-// comparison if the pattern contains no metacharacters.
-func (m *modulePat) match(file string) bool {
- if m.literal {
- return file == m.pattern
- }
- match, _ := filepath.Match(m.pattern, file)
- return match
-}
-
-func (m *moduleSpec) String() string {
- // Lock because the type is not atomic. TODO: clean this up.
- logging.mu.Lock()
- defer logging.mu.Unlock()
- var b bytes.Buffer
- for i, f := range m.filter {
- if i > 0 {
- b.WriteRune(',')
- }
- fmt.Fprintf(&b, "%s=%d", f.pattern, f.level)
- }
- return b.String()
-}
-
-// Get is part of the (Go 1.2) flag.Getter interface. It always returns nil for this flag type since the
-// struct is not exported.
-func (m *moduleSpec) Get() interface{} {
- return nil
-}
-
-var errVmoduleSyntax = errors.New("syntax error: expect comma-separated list of filename=N")
-
-// Syntax: -vmodule=recordio=2,file=1,gfs*=3
-func (m *moduleSpec) Set(value 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 {
- continue // Ignore. It's harmless but no point in paying the overhead.
- }
- // TODO: check syntax of filter?
- filter = append(filter, modulePat{pattern, isLiteral(pattern), Level(v)})
- }
- logging.mu.Lock()
- defer logging.mu.Unlock()
- logging.setVState(logging.verbosity, filter, true)
- return nil
-}
-
-// isLiteral reports whether the pattern is a literal string, that is, has no metacharacters
-// that require filepath.Match to be called to match the pattern.
-func isLiteral(pattern string) bool {
- return !strings.ContainsAny(pattern, `\*?[]`)
-}
-
-// traceLocation represents the setting of the -log_backtrace_at flag.
-type traceLocation struct {
- file string
- line int
-}
-
-// isSet reports whether the trace location has been specified.
-// logging.mu is held.
-func (t *traceLocation) isSet() bool {
- return t.line > 0
-}
-
-// match reports whether the specified file and line matches the trace location.
-// The argument file name is the full path, not the basename specified in the flag.
-// logging.mu is held.
-func (t *traceLocation) match(file string, line int) bool {
- if t.line != line {
- return false
- }
- if i := strings.LastIndex(file, "/"); i >= 0 {
- file = file[i+1:]
- }
- return t.file == file
-}
-
-func (t *traceLocation) String() string {
- // Lock because the type is not atomic. TODO: clean this up.
- logging.mu.Lock()
- defer logging.mu.Unlock()
- return fmt.Sprintf("%s:%d", t.file, t.line)
-}
-
-// Get is part of the (Go 1.2) flag.Getter interface. It always returns nil for this flag type since the
-// struct is not exported
-func (t *traceLocation) Get() interface{} {
- return nil
-}
-
-var errTraceSyntax = errors.New("syntax error: expect file.go:234")
-
-// Syntax: -log_backtrace_at=gopherflakes.go:234
-// Note that unlike vmodule the file extension is included here.
-func (t *traceLocation) Set(value string) error {
- if value == "" {
- // Unset.
- t.line = 0
- t.file = ""
- }
- fields := strings.Split(value, ":")
- if len(fields) != 2 {
- return errTraceSyntax
- }
- file, line := fields[0], fields[1]
- if !strings.Contains(file, ".") {
- return errTraceSyntax
- }
- v, err := strconv.Atoi(line)
- if err != nil {
- return errTraceSyntax
- }
- if v <= 0 {
- return errors.New("negative or zero value for level")
- }
- logging.mu.Lock()
- defer logging.mu.Unlock()
- t.line = v
- t.file = file
- return nil
-}
-
-// flushSyncWriter is the interface satisfied by logging destinations.
-type flushSyncWriter interface {
- Flush() error
- Sync() error
- io.Writer
-}
-
-func init() {
- flag.BoolVar(&logging.toStderr, "logtostderr", false, "log to standard error instead of files")
- flag.BoolVar(&logging.alsoToStderr, "alsologtostderr", false, "log to standard error as well as files")
- flag.Var(&logging.verbosity, "v", "log level for V logs")
- flag.Var(&logging.stderrThreshold, "stderrthreshold", "logs at or above this threshold go to stderr")
- 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")
-
- // Default stderrThreshold is ERROR.
- logging.stderrThreshold = errorLog
-
- logging.setVState(0, nil, false)
- go logging.flushDaemon()
-}
-
-// Flush flushes all pending log I/O.
-func Flush() {
- logging.lockAndFlushAll()
-}
-
-// loggingT collects all the global state of the logging setup.
-type loggingT struct {
- // Boolean flags. Not handled atomically because the flag.Value interface
- // does not let us avoid the =true, and that shorthand is necessary for
- // compatibility. TODO: does this matter enough to fix? Seems unlikely.
- toStderr bool // The -logtostderr flag.
- alsoToStderr bool // The -alsologtostderr flag.
-
- // Level flag. Handled atomically.
- stderrThreshold severity // The -stderrthreshold flag.
-
- // freeList is a list of byte buffers, maintained under freeListMu.
- freeList *buffer
- // freeListMu maintains the free list. It is separate from the main mutex
- // so buffers can be grabbed and printed to without holding the main lock,
- // for better parallelization.
- freeListMu sync.Mutex
-
- // mu protects the remaining elements of this structure and is
- // used to synchronize logging.
- mu sync.Mutex
- // file holds writer for each of the log types.
- file [numSeverity]flushSyncWriter
- // pcs is used in V to avoid an allocation when computing the caller's PC.
- pcs [1]uintptr
- // vmap is a cache of the V Level for each V() call site, identified by PC.
- // It is wiped whenever the vmodule flag changes state.
- vmap map[uintptr]Level
- // filterLength stores the length of the vmodule filter chain. If greater
- // than zero, it means vmodule is enabled. It may be read safely
- // using sync.LoadInt32, but is only modified under mu.
- filterLength int32
- // traceLocation is the state of the -log_backtrace_at flag.
- traceLocation traceLocation
- // These flags are modified only under lock, although verbosity may be fetched
- // safely using atomic.LoadInt32.
- vmodule moduleSpec // The state of the -vmodule flag.
- verbosity Level // V logging level, the value of the -v flag/
-}
-
-// buffer holds a byte Buffer for reuse. The zero value is ready for use.
-type buffer struct {
- bytes.Buffer
- tmp [64]byte // temporary byte array for creating headers.
- next *buffer
-}
-
-var logging loggingT
-
-// setVState sets a consistent state for V logging.
-// l.mu is held.
-func (l *loggingT) setVState(verbosity Level, filter []modulePat, setFilter bool) {
- // Turn verbosity off so V will not fire while we are in transition.
- logging.verbosity.set(0)
- // Ditto for filter length.
- atomic.StoreInt32(&logging.filterLength, 0)
-
- // Set the new filters and wipe the pc->Level map if the filter has changed.
- if setFilter {
- logging.vmodule.filter = filter
- logging.vmap = make(map[uintptr]Level)
- }
-
- // Things are consistent now, so enable filtering and verbosity.
- // They are enabled in order opposite to that in V.
- atomic.StoreInt32(&logging.filterLength, int32(len(filter)))
- logging.verbosity.set(verbosity)
-}
-
-// getBuffer returns a new, ready-to-use buffer.
-func (l *loggingT) getBuffer() *buffer {
- l.freeListMu.Lock()
- b := l.freeList
- if b != nil {
- l.freeList = b.next
- }
- l.freeListMu.Unlock()
- if b == nil {
- b = new(buffer)
- } else {
- b.next = nil
- b.Reset()
- }
- return b
-}
-
-// putBuffer returns a buffer to the free list.
-func (l *loggingT) putBuffer(b *buffer) {
- if b.Len() >= 256 {
- // Let big buffers die a natural death.
- return
- }
- l.freeListMu.Lock()
- b.next = l.freeList
- l.freeList = b
- l.freeListMu.Unlock()
-}
-
-var timeNow = time.Now // Stubbed out for testing.
-
-/*
-header formats a log header as defined by the C++ implementation.
-It returns a buffer containing the formatted header and the user's file and line number.
-The depth specifies how many stack frames above lives the source line to be identified in the log message.
-
-Log lines have this form:
- Lmmdd hh:mm:ss.uuuuuu threadid file:line] msg...
-where the fields are defined as follows:
- L A single character, representing the log level (eg 'I' for INFO)
- mm The month (zero padded; ie May is '05')
- dd The day (zero padded)
- hh:mm:ss.uuuuuu Time in hours, minutes and fractional seconds
- threadid The space-padded thread ID as returned by GetTID()
- file The file name
- line The line number
- msg The user-supplied message
-*/
-func (l *loggingT) header(s severity, depth int) (*buffer, string, int) {
- _, file, line, ok := runtime.Caller(3 + depth)
- if !ok {
- file = "???"
- line = 1
- } else {
- slash := strings.LastIndex(file, "/")
- if slash >= 0 {
- file = file[slash+1:]
- }
- }
- return l.formatHeader(s, file, line), file, line
-}
-
-// formatHeader formats a log header using the provided file name and line number.
-func (l *loggingT) formatHeader(s severity, file string, line int) *buffer {
- now := timeNow()
- if line < 0 {
- line = 0 // not a real line number, but acceptable to someDigits
- }
- if s > fatalLog {
- s = infoLog // for safety.
- }
- buf := l.getBuffer()
-
- // Avoid Fprintf, for speed. The format is so simple that we can do it quickly by hand.
- // It's worth about 3X. Fprintf is hard.
- _, month, day := now.Date()
- hour, minute, second := now.Clock()
- // Lmmdd hh:mm:ss.uuuuuu threadid file:line]
- buf.tmp[0] = severityChar[s]
- buf.twoDigits(1, int(month))
- buf.twoDigits(3, day)
- buf.tmp[5] = ' '
- buf.twoDigits(6, hour)
- buf.tmp[8] = ':'
- buf.twoDigits(9, minute)
- buf.tmp[11] = ':'
- buf.twoDigits(12, second)
- buf.tmp[14] = '.'
- buf.nDigits(6, 15, now.Nanosecond()/1000, '0')
- buf.tmp[21] = ' '
- buf.nDigits(7, 22, pid, ' ') // TODO: should be TID
- buf.tmp[29] = ' '
- buf.Write(buf.tmp[:30])
- buf.WriteString(file)
- buf.tmp[0] = ':'
- n := buf.someDigits(1, line)
- buf.tmp[n+1] = ']'
- buf.tmp[n+2] = ' '
- buf.Write(buf.tmp[:n+3])
- return buf
-}
-
-// Some custom tiny helper functions to print the log header efficiently.
-
-const digits = "0123456789"
-
-// twoDigits formats a zero-prefixed two-digit integer at buf.tmp[i].
-func (buf *buffer) twoDigits(i, d int) {
- buf.tmp[i+1] = digits[d%10]
- d /= 10
- buf.tmp[i] = digits[d%10]
-}
-
-// nDigits formats an n-digit integer at buf.tmp[i],
-// padding with pad on the left.
-// It assumes d >= 0.
-func (buf *buffer) nDigits(n, i, d int, pad byte) {
- j := n - 1
- for ; j >= 0 && d > 0; j-- {
- buf.tmp[i+j] = digits[d%10]
- d /= 10
- }
- for ; j >= 0; j-- {
- buf.tmp[i+j] = pad
- }
-}
-
-// someDigits formats a zero-prefixed variable-width integer at buf.tmp[i].
-func (buf *buffer) someDigits(i, d int) int {
- // Print into the top, then copy down. We know there's space for at least
- // a 10-digit number.
- j := len(buf.tmp)
- for {
- j--
- buf.tmp[j] = digits[d%10]
- d /= 10
- if d == 0 {
- break
- }
- }
- return copy(buf.tmp[i:], buf.tmp[j:])
-}
-
-func (l *loggingT) println(s severity, args ...interface{}) {
- buf, file, line := l.header(s, 0)
- fmt.Fprintln(buf, args...)
- l.output(s, buf, file, line, false)
-}
-
-func (l *loggingT) print(s severity, args ...interface{}) {
- l.printDepth(s, 1, args...)
-}
-
-func (l *loggingT) printDepth(s severity, depth int, args ...interface{}) {
- buf, file, line := l.header(s, depth)
- fmt.Fprint(buf, args...)
- if buf.Bytes()[buf.Len()-1] != '\n' {
- buf.WriteByte('\n')
- }
- l.output(s, buf, file, line, false)
-}
-
-func (l *loggingT) printf(s severity, format string, args ...interface{}) {
- buf, file, line := l.header(s, 0)
- fmt.Fprintf(buf, format, args...)
- if buf.Bytes()[buf.Len()-1] != '\n' {
- buf.WriteByte('\n')
- }
- l.output(s, buf, file, line, false)
-}
-
-// printWithFileLine behaves like print but uses the provided file and line number. If
-// alsoLogToStderr is true, the log message always appears on standard error; it
-// will also appear in the log file unless --logtostderr is set.
-func (l *loggingT) printWithFileLine(s severity, file string, line int, alsoToStderr bool, args ...interface{}) {
- buf := l.formatHeader(s, file, line)
- fmt.Fprint(buf, args...)
- if buf.Bytes()[buf.Len()-1] != '\n' {
- buf.WriteByte('\n')
- }
- l.output(s, buf, file, line, alsoToStderr)
-}
-
-// output writes the data to the log files and releases the buffer.
-func (l *loggingT) output(s severity, buf *buffer, file string, line int, alsoToStderr bool) {
- l.mu.Lock()
- if l.traceLocation.isSet() {
- if l.traceLocation.match(file, line) {
- buf.Write(stacks(false))
- }
- }
- data := buf.Bytes()
- if !flag.Parsed() {
- os.Stderr.Write([]byte("ERROR: logging before flag.Parse: "))
- os.Stderr.Write(data)
- } else if l.toStderr {
- os.Stderr.Write(data)
- } else {
- if alsoToStderr || l.alsoToStderr || s >= l.stderrThreshold.get() {
- os.Stderr.Write(data)
- }
- if l.file[s] == nil {
- if err := l.createFiles(s); err != nil {
- os.Stderr.Write(data) // Make sure the message appears somewhere.
- l.exit(err)
- }
- }
- switch s {
- case fatalLog:
- l.file[fatalLog].Write(data)
- fallthrough
- case errorLog:
- l.file[errorLog].Write(data)
- fallthrough
- case warningLog:
- l.file[warningLog].Write(data)
- fallthrough
- case infoLog:
- l.file[infoLog].Write(data)
- }
- }
- if s == fatalLog {
- // If we got here via Exit rather than Fatal, print no stacks.
- if atomic.LoadUint32(&fatalNoStacks) > 0 {
- l.mu.Unlock()
- timeoutFlush(10 * time.Second)
- os.Exit(1)
- }
- // Dump all goroutine stacks before exiting.
- // First, make sure we see the trace for the current goroutine on standard error.
- // If -logtostderr has been specified, the loop below will do that anyway
- // as the first stack in the full dump.
- if !l.toStderr {
- os.Stderr.Write(stacks(false))
- }
- // Write the stack trace for all goroutines to the files.
- trace := stacks(true)
- logExitFunc = func(error) {} // If we get a write error, we'll still exit below.
- for log := fatalLog; log >= infoLog; log-- {
- if f := l.file[log]; f != nil { // Can be nil if -logtostderr is set.
- f.Write(trace)
- }
- }
- l.mu.Unlock()
- timeoutFlush(10 * time.Second)
- os.Exit(255) // C++ uses -1, which is silly because it's anded with 255 anyway.
- }
- l.putBuffer(buf)
- l.mu.Unlock()
- if stats := severityStats[s]; stats != nil {
- atomic.AddInt64(&stats.lines, 1)
- atomic.AddInt64(&stats.bytes, int64(len(data)))
- }
-}
-
-// timeoutFlush calls Flush and returns when it completes or after timeout
-// elapses, whichever happens first. This is needed because the hooks invoked
-// by Flush may deadlock when glog.Fatal is called from a hook that holds
-// a lock.
-func timeoutFlush(timeout time.Duration) {
- done := make(chan bool, 1)
- go func() {
- Flush() // calls logging.lockAndFlushAll()
- done <- true
- }()
- select {
- case <-done:
- case <-time.After(timeout):
- fmt.Fprintln(os.Stderr, "glog: Flush took longer than", timeout)
- }
-}
-
-// stacks is a wrapper for runtime.Stack that attempts to recover the data for all goroutines.
-func stacks(all bool) []byte {
- // We don't know how big the traces are, so grow a few times if they don't fit. Start large, though.
- n := 10000
- if all {
- n = 100000
- }
- var trace []byte
- for i := 0; i < 5; i++ {
- trace = make([]byte, n)
- nbytes := runtime.Stack(trace, all)
- if nbytes < len(trace) {
- return trace[:nbytes]
- }
- n *= 2
- }
- return trace
-}
-
-// logExitFunc provides a simple mechanism to override the default behavior
-// of exiting on error. Used in testing and to guarantee we reach a required exit
-// for fatal logs. Instead, exit could be a function rather than a method but that
-// would make its use clumsier.
-var logExitFunc func(error)
-
-// exit is called if there is trouble creating or writing log files.
-// It flushes the logs and exits the program; there's no point in hanging around.
-// l.mu is held.
-func (l *loggingT) exit(err error) {
- fmt.Fprintf(os.Stderr, "log: exiting because of error: %s\n", err)
- // If logExitFunc is set, we do that instead of exiting.
- if logExitFunc != nil {
- logExitFunc(err)
- return
- }
- l.flushAll()
- os.Exit(2)
-}
-
-// syncBuffer joins a bufio.Writer to its underlying file, providing access to the
-// file's Sync method and providing a wrapper for the Write method that provides log
-// file rotation. There are conflicting methods, so the file cannot be embedded.
-// l.mu is held for all its methods.
-type syncBuffer struct {
- logger *loggingT
- *bufio.Writer
- file *os.File
- sev severity
- nbytes uint64 // The number of bytes written to this file
-}
-
-func (sb *syncBuffer) Sync() error {
- return sb.file.Sync()
-}
-
-func (sb *syncBuffer) Write(p []byte) (n int, err error) {
- if sb.nbytes+uint64(len(p)) >= MaxSize {
- if err := sb.rotateFile(time.Now()); err != nil {
- sb.logger.exit(err)
- }
- }
- n, err = sb.Writer.Write(p)
- sb.nbytes += uint64(n)
- if err != nil {
- sb.logger.exit(err)
- }
- return
-}
-
-// rotateFile closes the syncBuffer's file and starts a new one.
-func (sb *syncBuffer) rotateFile(now time.Time) error {
- if sb.file != nil {
- sb.Flush()
- sb.file.Close()
- }
- var err error
- sb.file, _, err = create(severityName[sb.sev], now)
- sb.nbytes = 0
- if err != nil {
- return err
- }
-
- sb.Writer = bufio.NewWriterSize(sb.file, bufferSize)
-
- // Write header.
- var buf bytes.Buffer
- fmt.Fprintf(&buf, "Log file created at: %s\n", now.Format("2006/01/02 15:04:05"))
- fmt.Fprintf(&buf, "Running on machine: %s\n", host)
- fmt.Fprintf(&buf, "Binary: Built with %s %s for %s/%s\n", runtime.Compiler, runtime.Version(), runtime.GOOS, runtime.GOARCH)
- fmt.Fprintf(&buf, "Log line format: [IWEF]mmdd hh:mm:ss.uuuuuu threadid file:line] msg\n")
- n, err := sb.file.Write(buf.Bytes())
- sb.nbytes += uint64(n)
- return err
-}
-
-// bufferSize sizes the buffer associated with each log file. It's large
-// so that log records can accumulate without the logging thread blocking
-// on disk I/O. The flushDaemon will block instead.
-const bufferSize = 256 * 1024
-
-// createFiles creates all the log files for severity from sev down to infoLog.
-// l.mu is held.
-func (l *loggingT) createFiles(sev severity) error {
- now := time.Now()
- // Files are created in decreasing severity order, so as soon as we find one
- // has already been created, we can stop.
- for s := sev; s >= infoLog && l.file[s] == nil; s-- {
- sb := &syncBuffer{
- logger: l,
- sev: s,
- }
- if err := sb.rotateFile(now); err != nil {
- return err
- }
- l.file[s] = sb
- }
- return nil
-}
-
-const flushInterval = 30 * time.Second
-
-// flushDaemon periodically flushes the log file buffers.
-func (l *loggingT) flushDaemon() {
- for _ = range time.NewTicker(flushInterval).C {
- l.lockAndFlushAll()
- }
-}
-
-// lockAndFlushAll is like flushAll but locks l.mu first.
-func (l *loggingT) lockAndFlushAll() {
- l.mu.Lock()
- l.flushAll()
- l.mu.Unlock()
-}
-
-// flushAll flushes all the logs and attempts to "sync" their data to disk.
-// l.mu is held.
-func (l *loggingT) flushAll() {
- // Flush from fatal down, in case there's trouble flushing.
- for s := fatalLog; s >= infoLog; s-- {
- file := l.file[s]
- if file != nil {
- file.Flush() // ignore error
- file.Sync() // ignore error
- }
- }
-}
-
-// 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 CopyStandardLogTo(name string) {
- sev, ok := severityByName(name)
- if !ok {
- panic(fmt.Sprintf("log.CopyStandardLogTo(%q): unrecognized severity name", name))
- }
- // Set a log format that captures the user's file and line:
- // d.go:23: message
- stdLog.SetFlags(stdLog.Lshortfile)
- stdLog.SetOutput(logBridge(sev))
-}
-
-// logBridge provides the Write method that enables CopyStandardLogTo to connect
-// Go's standard logs to the logs provided by this package.
-type logBridge severity
-
-// Write parses the standard logging line and passes its components to the
-// logger for severity(lb).
-func (lb logBridge) Write(b []byte) (n int, err error) {
- var (
- file = "???"
- line = 1
- text string
- )
- // Split "d.go:23: message" into "d.go", "23", and "message".
- if parts := bytes.SplitN(b, []byte{':'}, 3); len(parts) != 3 || len(parts[0]) < 1 || len(parts[2]) < 1 {
- text = fmt.Sprintf("bad log format: %s", b)
- } else {
- file = string(parts[0])
- text = string(parts[2][1:]) // skip leading space
- line, err = strconv.Atoi(string(parts[1]))
- if err != nil {
- text = fmt.Sprintf("bad line number: %s", b)
- line = 1
- }
- }
- // printWithFileLine with alsoToStderr=true, so standard log messages
- // always appear on standard error.
- logging.printWithFileLine(severity(lb), file, line, true, text)
- return len(b), nil
-}
-
-// setV computes and remembers the V level for a given PC
-// when vmodule is enabled.
-// File pattern matching takes the basename of the file, stripped
-// of its .go suffix, and uses filepath.Match, which is a little more
-// general than the *? matching used in C++.
-// l.mu is held.
-func (l *loggingT) setV(pc uintptr) Level {
- fn := runtime.FuncForPC(pc)
- file, _ := fn.FileLine(pc)
- // The file is something like /a/b/c/d.go. We want just the d.
- if strings.HasSuffix(file, ".go") {
- file = file[:len(file)-3]
- }
- if slash := strings.LastIndex(file, "/"); slash >= 0 {
- file = file[slash+1:]
- }
- for _, filter := range l.vmodule.filter {
- if filter.match(file) {
- l.vmap[pc] = filter.level
- return filter.level
- }
- }
- l.vmap[pc] = 0
- return 0
-}
-
-// Verbose is a boolean type that implements Infof (like Printf) etc.
-// See the documentation of V for more information.
-type Verbose bool
-
-// 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 V(level Level) Verbose {
- // This function tries hard to be cheap unless there's work to do.
- // The fast path is two atomic loads and compares.
-
- // Here is a cheap but safe test to see if V logging is enabled globally.
- if logging.verbosity.get() >= level {
- return Verbose(true)
- }
-
- // It's off globally but it vmodule may still be set.
- // Here is another cheap but safe test to see if vmodule is enabled.
- if atomic.LoadInt32(&logging.filterLength) > 0 {
- // Now we need a proper lock to use the logging structure. The pcs field
- // is shared so we must lock before accessing it. This is fairly expensive,
- // but if V logging is enabled we're slow anyway.
- logging.mu.Lock()
- defer logging.mu.Unlock()
- if runtime.Callers(2, logging.pcs[:]) == 0 {
- return Verbose(false)
- }
- v, ok := logging.vmap[logging.pcs[0]]
- if !ok {
- v = logging.setV(logging.pcs[0])
- }
- return Verbose(v >= level)
- }
- return Verbose(false)
-}
-
-// Info is equivalent to the global Info function, guarded by the value of v.
-// See the documentation of V for usage.
-func (v Verbose) Info(args ...interface{}) {
- if v {
- logging.print(infoLog, args...)
- }
-}
-
-// Infoln is equivalent to the global Infoln function, guarded by the value of v.
-// See the documentation of V for usage.
-func (v Verbose) Infoln(args ...interface{}) {
- if v {
- logging.println(infoLog, args...)
- }
-}
-
-// Infof is equivalent to the global Infof function, guarded by the value of v.
-// See the documentation of V for usage.
-func (v Verbose) Infof(format string, args ...interface{}) {
- if v {
- logging.printf(infoLog, format, args...)
- }
-}
-
-// Info logs to the INFO log.
-// Arguments are handled in the manner of fmt.Print; a newline is appended if missing.
-func Info(args ...interface{}) {
- logging.print(infoLog, args...)
-}
-
-// InfoDepth acts as Info but uses depth to determine which call frame to log.
-// InfoDepth(0, "msg") is the same as Info("msg").
-func InfoDepth(depth int, args ...interface{}) {
- logging.printDepth(infoLog, depth, args...)
-}
-
-// Infoln logs to the INFO log.
-// Arguments are handled in the manner of fmt.Println; a newline is appended if missing.
-func Infoln(args ...interface{}) {
- logging.println(infoLog, args...)
-}
-
-// Infof logs to the INFO log.
-// Arguments are handled in the manner of fmt.Printf; a newline is appended if missing.
-func Infof(format string, args ...interface{}) {
- logging.printf(infoLog, format, args...)
-}
-
-// Warning logs to the WARNING and INFO logs.
-// Arguments are handled in the manner of fmt.Print; a newline is appended if missing.
-func Warning(args ...interface{}) {
- logging.print(warningLog, args...)
-}
-
-// WarningDepth acts as Warning but uses depth to determine which call frame to log.
-// WarningDepth(0, "msg") is the same as Warning("msg").
-func WarningDepth(depth int, args ...interface{}) {
- logging.printDepth(warningLog, depth, args...)
-}
-
-// Warningln logs to the WARNING and INFO logs.
-// Arguments are handled in the manner of fmt.Println; a newline is appended if missing.
-func Warningln(args ...interface{}) {
- logging.println(warningLog, args...)
-}
-
-// Warningf logs to the WARNING and INFO logs.
-// Arguments are handled in the manner of fmt.Printf; a newline is appended if missing.
-func Warningf(format string, args ...interface{}) {
- logging.printf(warningLog, format, args...)
-}
-
-// 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 Error(args ...interface{}) {
- logging.print(errorLog, args...)
-}
-
-// ErrorDepth acts as Error but uses depth to determine which call frame to log.
-// ErrorDepth(0, "msg") is the same as Error("msg").
-func ErrorDepth(depth int, args ...interface{}) {
- logging.printDepth(errorLog, depth, args...)
-}
-
-// 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 Errorln(args ...interface{}) {
- logging.println(errorLog, args...)
-}
-
-// 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 Errorf(format string, args ...interface{}) {
- logging.printf(errorLog, format, args...)
-}
-
-// 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 Fatal(args ...interface{}) {
- logging.print(fatalLog, args...)
-}
-
-// FatalDepth acts as Fatal but uses depth to determine which call frame to log.
-// FatalDepth(0, "msg") is the same as Fatal("msg").
-func FatalDepth(depth int, args ...interface{}) {
- logging.printDepth(fatalLog, depth, args...)
-}
-
-// 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 Fatalln(args ...interface{}) {
- logging.println(fatalLog, args...)
-}
-
-// 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 Fatalf(format string, args ...interface{}) {
- logging.printf(fatalLog, format, args...)
-}
-
-// fatalNoStacks is non-zero if we are to exit without dumping goroutine stacks.
-// It allows Exit and relatives to use the Fatal logs.
-var fatalNoStacks uint32
-
-// 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 Exit(args ...interface{}) {
- atomic.StoreUint32(&fatalNoStacks, 1)
- logging.print(fatalLog, args...)
-}
-
-// ExitDepth acts as Exit but uses depth to determine which call frame to log.
-// ExitDepth(0, "msg") is the same as Exit("msg").
-func ExitDepth(depth int, args ...interface{}) {
- atomic.StoreUint32(&fatalNoStacks, 1)
- logging.printDepth(fatalLog, depth, args...)
-}
-
-// Exitln logs to the FATAL, ERROR, WARNING, and INFO logs, then calls os.Exit(1).
-func Exitln(args ...interface{}) {
- atomic.StoreUint32(&fatalNoStacks, 1)
- logging.println(fatalLog, args...)
-}
-
-// 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 Exitf(format string, args ...interface{}) {
- atomic.StoreUint32(&fatalNoStacks, 1)
- logging.printf(fatalLog, format, args...)
-}