Initial commit

This commit is contained in:
Mikaël Cluseau
2018-06-12 20:52:20 +11:00
commit 1293dd0444
13 changed files with 1157 additions and 0 deletions

52
log/compress.go Normal file
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package log
import (
"fmt"
"io"
"os"
"path/filepath"
"github.com/ulikunitz/xz"
)
func compress(path string) {
in, err := os.Open(path)
if err != nil {
fmt.Fprintf(os.Stderr, "compress %s: failed to open: %v", path, err)
return
}
defer in.Close()
outPath := filepath.Join(filepath.Dir(path), "archives", filepath.Base(path)+".xz")
os.MkdirAll(filepath.Dir(outPath), 0700)
out, err := os.Create(outPath)
if err != nil {
fmt.Fprintf(os.Stderr, "compress %s: failed to create target: %v", path, err)
return
}
defer out.Close()
w, err := xz.NewWriter(out)
if err != nil {
fmt.Fprintf(os.Stderr, "compress %s: failed to create writer: %v", path, err)
return
}
if _, err := io.Copy(w, in); err != nil {
fmt.Fprintf(os.Stderr, "compress %s: write failed: %v", path, err)
return
}
if err := w.Close(); err != nil {
fmt.Fprintf(os.Stderr, "compress %s: close failed: %v", path, err)
return
}
if err := os.Remove(path); err != nil {
fmt.Fprintf(os.Stderr, "compress %s: failed to remove source: %v", path, err)
}
}

119
log/entry.go Normal file
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package log
import (
"encoding/base32"
"fmt"
"io"
"time"
)
type Entry struct {
Time time.Time
Taint Taint
Data []byte
}
// WriteTo writes this log entry to w.
// Automatically appends a new line if it's not already present to
// get an easy to read log.
func (e Entry) WriteTo(w io.Writer) (n int64, err error) {
l := len(e.Data)
t := e.Time.UnixNano()
flags := byte(0)
appendNL := e.Data[len(e.Data)-1] != '\n'
if appendNL {
flags |= AppendNL
}
b := []byte{
flags,
byte(e.Taint),
byte(l >> 16 & 0xff),
byte(l >> 8 & 0xff),
byte(l >> 0 & 0xff),
byte(t >> 56 & 0xff),
byte(t >> 48 & 0xff),
byte(t >> 40 & 0xff),
byte(t >> 32 & 0xff),
byte(t >> 24 & 0xff),
byte(t >> 16 & 0xff),
byte(t >> 8 & 0xff),
byte(t >> 0 & 0xff),
}
// the binary part is b32 encoded. Obscure but still readable in text mode.
enc := base32.StdEncoding
headerLen := enc.EncodedLen(len(b))
baLen := headerLen + len(e.Data)
if appendNL {
baLen++
}
ba := make([]byte, baLen)
enc.Encode(ba, b)
copy(ba[headerLen:], e.Data)
if appendNL {
ba[baLen-1] = '\n'
}
nw, err := w.Write(ba)
return int64(nw), err
}
// ReadFrom reads the next entry from r, updating this entry.
func (e *Entry) ReadFrom(r io.Reader) (n int64, err error) {
enc := base32.StdEncoding
const L = 1 + 1 + 3 + 8
b := make([]byte, L)
ba := make([]byte, enc.EncodedLen(L))
nr, err := r.Read(ba)
if err != nil {
return int64(nr), err
}
fmt.Println(string(ba))
enc.Decode(b, ba)
fmt.Println(b)
p := 0
flags := b[p]
p++
e.Taint = Taint(b[p])
p++
l := int32(0)
for i := 0; i < 3; i++ {
l = l<<8 | int32(b[p])
p++
}
readLen := l
if flags|AppendNL != 0 {
readLen++
}
t := int64(0)
for i := 0; i < 8; i++ {
t = t<<8 | int64(b[p])
p++
}
e.Time = time.Unix(0, t)
data := make([]byte, readLen)
m, err := r.Read(data)
n += int64(m)
if err != nil {
return n, err
}
e.Data = data[:l]
return n, nil
}

38
log/entry_test.go Normal file
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package log
import (
"bytes"
"testing"
"time"
)
func TestEncode(t *testing.T) {
l1 := Entry{time.Now(), Normal, []byte("test entry")}
l2 := Entry{}
buf := &bytes.Buffer{}
l1.WriteTo(buf)
t.Log(buf.String())
_, err := l2.ReadFrom(buf)
if err != nil {
t.Error("read error: ", err)
}
if l1.Taint != l2.Taint {
t.Errorf("wrong taint: %v != %v", l1.Taint, l2.Taint)
}
if l1.Time.UnixNano() != l2.Time.UnixNano() {
t.Errorf("wrong time: %v != %v", l1.Time, l2.Time)
}
if !bytes.Equal(l1.Data, l2.Data) {
t.Errorf("wrong data: %q != %q", string(l1.Data), string(l2.Data))
}
if l := len(buf.Bytes()); l > 0 {
t.Errorf("%d bytes not read", l)
}
}

244
log/log.go Normal file
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package log
import (
"bufio"
"bytes"
"fmt"
"io"
"os"
"sync"
"time"
"novit.nc/direktil/src/pkg/color"
)
const (
// AppendNL indicates that a forced '\n' is added.
AppendNL byte = 1
)
var (
logs = map[string]*Log{}
mutex = sync.Mutex{}
logOutputEnabled = false
)
// Log is a log target
type Log struct {
name string
l sync.Mutex
writeToFile bool
console io.Writer
pending []Entry
out *os.File
outPath string
}
func Get(name string) *Log {
mutex.Lock()
defer mutex.Unlock()
if log, ok := logs[name]; ok {
return log
}
log := &Log{
name: name,
pending: make([]Entry, 0),
}
if logOutputEnabled {
log.enableFileOutput()
}
logs[name] = log
return log
}
// EnableFiles flushes current logs to files, and enables output to files.
func EnableFiles() {
mutex.Lock()
defer mutex.Unlock()
if logOutputEnabled {
return
}
for _, log := range logs {
// we'll let the kernel optimize, just do it all parallel
go log.enableFileOutput()
}
logOutputEnabled = true
}
// DisableFiles flushes and closes current logs files, and disables output to files.
func DisableFiles() {
mutex.Lock()
defer mutex.Unlock()
if !logOutputEnabled {
return
}
for _, log := range logs {
// we'll let the kernel optimize, just do it all parallel
go log.disableFileOutput()
}
logOutputEnabled = false
}
func (l *Log) enableFileOutput() {
l.l.Lock()
defer l.l.Unlock()
for _, e := range l.pending {
if err := l.writeEntry(e); err != nil {
l.emergencyLog(e, err)
}
}
l.writeToFile = true
}
func (l *Log) disableFileOutput() {
l.l.Lock()
defer l.l.Unlock()
if l.out != nil {
l.out.Close()
}
l.writeToFile = false
}
func (l *Log) SetConsole(console io.Writer) {
l.console = console
}
// StreamLines will copy the input line by line as log entries.
func (l *Log) StreamLines(r io.Reader) {
in := bufio.NewReader(r)
for {
line, err := in.ReadBytes('\n')
if err != nil {
if err != io.EOF {
fmt.Fprintf(os.Stderr, "log %s: read lines failed: %v\n", l.name, err)
time.Sleep(1 * time.Second)
}
return
}
l.Write(line)
}
}
// Print to this log.
func (l *Log) Print(v ...interface{}) {
fmt.Fprint(l, v...)
}
// Printf to this log.
func (l *Log) Printf(pattern string, v ...interface{}) {
fmt.Fprintf(l, pattern, v...)
}
// Taint is Print to this log with a taint.
func (l *Log) Taint(taint Taint, v ...interface{}) {
l.append(taint, []byte(fmt.Sprint(v...)))
}
// Taintf is Printf to this log with a taint.
func (l *Log) Taintf(taint Taint, pattern string, v ...interface{}) {
l.append(taint, []byte(fmt.Sprintf(pattern, v...)))
}
func (l *Log) append(taint Taint, data []byte) {
// we serialize writes
l.l.Lock()
defer l.l.Unlock()
e := Entry{
Time: time.Now(),
Taint: taint,
Data: data,
}
console := l.console
if console != nil {
buf := &bytes.Buffer{}
buf.WriteString(string(color.DarkGreen))
buf.WriteString(e.Time.Format("2006/01/02 15:04:05.000 "))
buf.WriteString(string(color.Reset))
buf.WriteString(string(e.Taint.Color()))
buf.Write(data)
if data[len(data)-1] != '\n' {
buf.Write([]byte{'\n'})
}
buf.WriteString(string(color.Reset))
buf.WriteTo(console)
}
if !l.writeToFile {
l.pending = append(l.pending, e)
// TODO if len(pending) > maxPending { pending = pending[len(pending)-underMaxPending:] }
// or use a ring
return
}
if err := l.writeEntry(e); err != nil {
l.emergencyLog(e, err)
}
}
func (l *Log) emergencyLog(entry Entry, err error) {
fmt.Fprintf(os.Stderr, "log %s: failed to write entry: %v\n -> lost entry: ", l.name, err)
entry.WriteTo(os.Stderr)
}
// Write is part of the io.Writer interface.
func (l *Log) Write(b []byte) (n int, err error) {
l.append(Normal, b)
return len(b), nil
}
func (l *Log) writeEntry(e Entry) (err error) {
path := fmt.Sprintf("/var/log/%s.%s.log",
l.name, e.Time.Truncate(time.Hour).Format(time.RFC3339))
currentPath := fmt.Sprintf("/var/log/%s.log", l.name)
if l.outPath != path {
if l.out != nil {
if err := l.out.Close(); err != nil {
fmt.Fprintf(os.Stderr, "log %s: failed to close output: %v\n", l.name, err)
}
os.Remove(currentPath)
go compress(l.outPath)
}
l.out = nil
l.outPath = ""
}
if l.out == nil {
l.out, err = os.OpenFile(path, os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0640)
if err != nil {
return
}
l.outPath = path
os.Remove(currentPath)
if err := os.Symlink(path, currentPath); err != nil {
fmt.Fprintf(os.Stderr, "failed to symlink %s.log: %v\n", l.name, err)
}
}
_, err = e.WriteTo(l.out)
return
}

33
log/taint.go Normal file
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package log
import (
"novit.nc/direktil/src/pkg/color"
)
const (
Normal Taint = iota
Info
Warning
Error
Fatal
OK
)
type Taint byte
func (t Taint) Color() color.Color {
switch t {
case Info:
return color.Blue
case Warning:
return color.Yellow
case Error:
return color.Red
case Fatal:
return color.Magenta
case OK:
return color.Green
default:
return color.None
}
}