summaryrefslogtreecommitdiff
path: root/vendor/github.com/getlantern/golog/golog.go
diff options
context:
space:
mode:
authorKali Kaneko (leap communications) <kali@leap.se>2019-08-08 00:19:33 +0200
committerKali Kaneko (leap communications) <kali@leap.se>2019-08-08 00:19:33 +0200
commitfde18e485ff7cbc7b2e33dade8e81136f06a5b60 (patch)
tree79a6dbd13e7e4a46e708a70104c548f403b477ae /vendor/github.com/getlantern/golog/golog.go
parent93e1de570f47b095905835735dbd67479aa0c2de (diff)
[pkg] remove vendor
Diffstat (limited to 'vendor/github.com/getlantern/golog/golog.go')
-rw-r--r--vendor/github.com/getlantern/golog/golog.go458
1 files changed, 0 insertions, 458 deletions
diff --git a/vendor/github.com/getlantern/golog/golog.go b/vendor/github.com/getlantern/golog/golog.go
deleted file mode 100644
index 143e904..0000000
--- a/vendor/github.com/getlantern/golog/golog.go
+++ /dev/null
@@ -1,458 +0,0 @@
-// Package golog implements logging functions that log errors to stderr and
-// debug messages to stdout. Trace logging is also supported.
-// Trace logs go to stdout as well, but they are only written if the program
-// is run with environment variable "TRACE=true".
-// A stack dump will be printed after the message if "PRINT_STACK=true".
-package golog
-
-import (
- "bufio"
- "bytes"
- "fmt"
- "io"
- "io/ioutil"
- "log"
- "os"
- "path/filepath"
- "runtime"
- "sort"
- "strconv"
- "strings"
- "sync"
- "sync/atomic"
-
- "github.com/getlantern/errors"
- "github.com/getlantern/hidden"
- "github.com/getlantern/ops"
- "github.com/oxtoacart/bpool"
-)
-
-const (
- // ERROR is an error Severity
- ERROR = 500
-
- // FATAL is an error Severity
- FATAL = 600
-)
-
-var (
- outs atomic.Value
- reporters []ErrorReporter
- reportersMutex sync.RWMutex
-
- bufferPool = bpool.NewBufferPool(200)
-
- onFatal atomic.Value
-)
-
-// Severity is a level of error (higher values are more severe)
-type Severity int
-
-func (s Severity) String() string {
- switch s {
- case ERROR:
- return "ERROR"
- case FATAL:
- return "FATAL"
- default:
- return "UNKNOWN"
- }
-}
-
-func init() {
- DefaultOnFatal()
- ResetOutputs()
-}
-
-func SetOutputs(errorOut io.Writer, debugOut io.Writer) {
- outs.Store(&outputs{
- ErrorOut: errorOut,
- DebugOut: debugOut,
- })
-}
-
-func ResetOutputs() {
- SetOutputs(os.Stderr, os.Stdout)
-}
-
-func GetOutputs() *outputs {
- return outs.Load().(*outputs)
-}
-
-// RegisterReporter registers the given ErrorReporter. All logged Errors are
-// sent to this reporter.
-func RegisterReporter(reporter ErrorReporter) {
- reportersMutex.Lock()
- reporters = append(reporters, reporter)
- reportersMutex.Unlock()
-}
-
-// OnFatal configures golog to call the given function on any FATAL error. By
-// default, golog calls os.Exit(1) on any FATAL error.
-func OnFatal(fn func(err error)) {
- onFatal.Store(fn)
-}
-
-// DefaultOnFatal enables the default behavior for OnFatal
-func DefaultOnFatal() {
- onFatal.Store(func(err error) {
- os.Exit(1)
- })
-}
-
-type outputs struct {
- ErrorOut io.Writer
- DebugOut io.Writer
-}
-
-// MultiLine is an interface for arguments that support multi-line output.
-type MultiLine interface {
- // MultiLinePrinter returns a function that can be used to print the
- // multi-line output. The returned function writes one line to the buffer and
- // returns true if there are more lines to write. This function does not need
- // to take care of trailing carriage returns, golog handles that
- // automatically.
- MultiLinePrinter() func(buf *bytes.Buffer) bool
-}
-
-// ErrorReporter is a function to which the logger will report errors.
-// It the given error and corresponding message along with associated ops
-// context. This should return quickly as it executes on the critical code
-// path. The recommended approach is to buffer as much as possible and discard
-// new reports if the buffer becomes saturated.
-type ErrorReporter func(err error, linePrefix string, severity Severity, ctx map[string]interface{})
-
-type Logger interface {
- // Debug logs to stdout
- Debug(arg interface{})
- // Debugf logs to stdout
- Debugf(message string, args ...interface{})
-
- // Error logs to stderr
- Error(arg interface{}) error
- // Errorf logs to stderr. It returns the first argument that's an error, or
- // a new error built using fmt.Errorf if none of the arguments are errors.
- Errorf(message string, args ...interface{}) error
-
- // Fatal logs to stderr and then exits with status 1
- Fatal(arg interface{})
- // Fatalf logs to stderr and then exits with status 1
- Fatalf(message string, args ...interface{})
-
- // Trace logs to stderr only if TRACE=true
- Trace(arg interface{})
- // Tracef logs to stderr only if TRACE=true
- Tracef(message string, args ...interface{})
-
- // TraceOut provides access to an io.Writer to which trace information can
- // be streamed. If running with environment variable "TRACE=true", TraceOut
- // will point to os.Stderr, otherwise it will point to a ioutil.Discared.
- // Each line of trace information will be prefixed with this Logger's
- // prefix.
- TraceOut() io.Writer
-
- // IsTraceEnabled() indicates whether or not tracing is enabled for this
- // logger.
- IsTraceEnabled() bool
-
- // AsStdLogger returns an standard logger
- AsStdLogger() *log.Logger
-}
-
-func LoggerFor(prefix string) Logger {
- l := &logger{
- prefix: prefix + ": ",
- pc: make([]uintptr, 10),
- }
-
- trace := os.Getenv("TRACE")
- l.traceOn, _ = strconv.ParseBool(trace)
- if !l.traceOn {
- prefixes := strings.Split(trace, ",")
- for _, p := range prefixes {
- if prefix == strings.Trim(p, " ") {
- l.traceOn = true
- break
- }
- }
- }
- if l.traceOn {
- l.traceOut = l.newTraceWriter()
- } else {
- l.traceOut = ioutil.Discard
- }
-
- printStack := os.Getenv("PRINT_STACK")
- l.printStack, _ = strconv.ParseBool(printStack)
-
- return l
-}
-
-type logger struct {
- prefix string
- traceOn bool
- traceOut io.Writer
- printStack bool
- outs atomic.Value
- pc []uintptr
- funcForPc *runtime.Func
-}
-
-// attaches the file and line number corresponding to
-// the log message
-func (l *logger) linePrefix(skipFrames int) string {
- runtime.Callers(skipFrames, l.pc)
- funcForPc := runtime.FuncForPC(l.pc[0])
- file, line := funcForPc.FileLine(l.pc[0] - 1)
- return fmt.Sprintf("%s%s:%d ", l.prefix, filepath.Base(file), line)
-}
-
-func (l *logger) print(out io.Writer, skipFrames int, severity string, arg interface{}) string {
- buf := bufferPool.Get()
- defer bufferPool.Put(buf)
-
- linePrefix := l.linePrefix(skipFrames)
- writeHeader := func() {
- buf.WriteString(severity)
- buf.WriteString(" ")
- buf.WriteString(linePrefix)
- }
- if arg != nil {
- ml, isMultiline := arg.(MultiLine)
- if !isMultiline {
- writeHeader()
- fmt.Fprintf(buf, "%v", arg)
- printContext(buf, arg)
- buf.WriteByte('\n')
- } else {
- mlp := ml.MultiLinePrinter()
- first := true
- for {
- writeHeader()
- more := mlp(buf)
- if first {
- printContext(buf, arg)
- first = false
- }
- buf.WriteByte('\n')
- if !more {
- break
- }
- }
- }
- }
- b := []byte(hidden.Clean(buf.String()))
- _, err := out.Write(b)
- if err != nil {
- errorOnLogging(err)
- }
- if l.printStack {
- l.doPrintStack()
- }
-
- return linePrefix
-}
-
-func (l *logger) printf(out io.Writer, skipFrames int, severity string, err error, message string, args ...interface{}) string {
- buf := bufferPool.Get()
- defer bufferPool.Put(buf)
-
- linePrefix := l.linePrefix(skipFrames)
- buf.WriteString(severity)
- buf.WriteString(" ")
- buf.WriteString(linePrefix)
- fmt.Fprintf(buf, message, args...)
- printContext(buf, err)
- buf.WriteByte('\n')
- b := []byte(hidden.Clean(buf.String()))
- _, err2 := out.Write(b)
- if err2 != nil {
- errorOnLogging(err)
- }
- if l.printStack {
- l.doPrintStack()
- }
- return linePrefix
-}
-
-func (l *logger) Debug(arg interface{}) {
- l.print(GetOutputs().DebugOut, 4, "DEBUG", arg)
-}
-
-func (l *logger) Debugf(message string, args ...interface{}) {
- l.printf(GetOutputs().DebugOut, 4, "DEBUG", nil, message, args...)
-}
-
-func (l *logger) Error(arg interface{}) error {
- return l.errorSkipFrames(arg, 1, ERROR)
-}
-
-func (l *logger) Errorf(message string, args ...interface{}) error {
- return l.errorSkipFrames(errors.NewOffset(1, message, args...), 1, ERROR)
-}
-
-func (l *logger) Fatal(arg interface{}) {
- fatal(l.errorSkipFrames(arg, 1, FATAL))
-}
-
-func (l *logger) Fatalf(message string, args ...interface{}) {
- fatal(l.errorSkipFrames(errors.NewOffset(1, message, args...), 1, FATAL))
-}
-
-func fatal(err error) {
- fn := onFatal.Load().(func(err error))
- fn(err)
-}
-
-func (l *logger) errorSkipFrames(arg interface{}, skipFrames int, severity Severity) error {
- var err error
- switch e := arg.(type) {
- case error:
- err = e
- default:
- err = fmt.Errorf("%v", e)
- }
- linePrefix := l.print(GetOutputs().ErrorOut, skipFrames+4, severity.String(), err)
- return report(err, linePrefix, severity)
-}
-
-func (l *logger) Trace(arg interface{}) {
- if l.traceOn {
- l.print(GetOutputs().DebugOut, 4, "TRACE", arg)
- }
-}
-
-func (l *logger) Tracef(message string, args ...interface{}) {
- if l.traceOn {
- l.printf(GetOutputs().DebugOut, 4, "TRACE", nil, message, args...)
- }
-}
-
-func (l *logger) TraceOut() io.Writer {
- return l.traceOut
-}
-
-func (l *logger) IsTraceEnabled() bool {
- return l.traceOn
-}
-
-func (l *logger) newTraceWriter() io.Writer {
- pr, pw := io.Pipe()
- br := bufio.NewReader(pr)
-
- if !l.traceOn {
- return pw
- }
- go func() {
- defer func() {
- if err := pr.Close(); err != nil {
- errorOnLogging(err)
- }
- }()
- defer func() {
- if err := pw.Close(); err != nil {
- errorOnLogging(err)
- }
- }()
-
- for {
- line, err := br.ReadString('\n')
- if err == nil {
- // Log the line (minus the trailing newline)
- l.print(GetOutputs().DebugOut, 6, "TRACE", line[:len(line)-1])
- } else {
- l.printf(GetOutputs().DebugOut, 6, "TRACE", nil, "TraceWriter closed due to unexpected error: %v", err)
- return
- }
- }
- }()
-
- return pw
-}
-
-type errorWriter struct {
- l *logger
-}
-
-// Write implements method of io.Writer, due to different call depth,
-// it will not log correct file and line prefix
-func (w *errorWriter) Write(p []byte) (n int, err error) {
- s := string(p)
- if s[len(s)-1] == '\n' {
- s = s[:len(s)-1]
- }
- w.l.print(GetOutputs().ErrorOut, 6, "ERROR", s)
- return len(p), nil
-}
-
-func (l *logger) AsStdLogger() *log.Logger {
- return log.New(&errorWriter{l}, "", 0)
-}
-
-func (l *logger) doPrintStack() {
- var b []byte
- buf := bytes.NewBuffer(b)
- for _, pc := range l.pc {
- funcForPc := runtime.FuncForPC(pc)
- if funcForPc == nil {
- break
- }
- name := funcForPc.Name()
- if strings.HasPrefix(name, "runtime.") {
- break
- }
- file, line := funcForPc.FileLine(pc)
- fmt.Fprintf(buf, "\t%s\t%s: %d\n", name, file, line)
- }
- if _, err := buf.WriteTo(os.Stderr); err != nil {
- errorOnLogging(err)
- }
-}
-
-func errorOnLogging(err error) {
- fmt.Fprintf(os.Stderr, "Unable to log: %v\n", err)
-}
-
-func printContext(buf *bytes.Buffer, err interface{}) {
- // Note - we don't include globals when printing in order to avoid polluting the text log
- values := ops.AsMap(err, false)
- if len(values) == 0 {
- return
- }
- buf.WriteString(" [")
- var keys []string
- for key := range values {
- keys = append(keys, key)
- }
- sort.Strings(keys)
- for i, key := range keys {
- value := values[key]
- if i > 0 {
- buf.WriteString(" ")
- }
- buf.WriteString(key)
- buf.WriteString("=")
- fmt.Fprintf(buf, "%v", value)
- }
- buf.WriteByte(']')
-}
-
-func report(err error, linePrefix string, severity Severity) error {
- var reportersCopy []ErrorReporter
- reportersMutex.RLock()
- if len(reporters) > 0 {
- reportersCopy = make([]ErrorReporter, len(reporters))
- copy(reportersCopy, reporters)
- }
- reportersMutex.RUnlock()
-
- if len(reportersCopy) > 0 {
- ctx := ops.AsMap(err, true)
- ctx["severity"] = severity.String()
- for _, reporter := range reportersCopy {
- // We include globals when reporting
- reporter(err, linePrefix, severity, ctx)
- }
- }
- return err
-}