/
impl.go
364 lines (336 loc) · 8.34 KB
/
impl.go
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package serverlogger
import (
"errors"
"fmt"
"io"
"log"
"os"
"regexp"
"runtime"
"strings"
"sync"
"time"
"github.com/Cloud-Foundations/Dominator/lib/logbuf"
"github.com/Cloud-Foundations/Dominator/lib/srpc"
"github.com/Cloud-Foundations/Dominator/lib/srpc/serverutil"
proto "github.com/Cloud-Foundations/Dominator/proto/logger"
)
type loggerMapT struct {
*serverutil.PerUserMethodLimiter
sync.Mutex
loggerMap map[string]*Logger
}
type grabWriter struct {
data []byte
}
var loggerMap *loggerMapT = &loggerMapT{
loggerMap: make(map[string]*Logger),
PerUserMethodLimiter: serverutil.NewPerUserMethodLimiter(
map[string]uint{
"Debug": 1,
"GetStackTrace": 1,
"Print": 1,
"SetDebugLevel": 1,
"Watch": 1,
}),
}
func init() {
srpc.RegisterName("Logger", loggerMap)
}
func getCallerName(depth int) string {
if pc, _, _, ok := runtime.Caller(depth); !ok {
return "UNKNOWN"
} else if fi := runtime.FuncForPC(pc); fi == nil {
return "UNKNOWN"
} else if splitName := strings.Split(fi.Name(), "."); len(splitName) < 1 {
return "UNKNOWN"
} else {
return splitName[len(splitName)-1]
}
}
func (w *grabWriter) Write(p []byte) (int, error) {
w.data = p
return len(p), nil
}
func newLogger(name string, options logbuf.Options, flags int) *Logger {
if name == "" && !options.AlsoLogToStderr {
options.RedirectStderr = true
}
loggerMap.Lock()
defer loggerMap.Unlock()
if _, ok := loggerMap.loggerMap[name]; ok {
panic("logger already exists: " + name)
}
circularBuffer := logbuf.NewWithOptions(options)
logger := &Logger{
circularBuffer: circularBuffer,
flags: flags,
level: int16(*initialLogDebugLevel),
streamers: make(map[*streamerType]struct{}),
}
if logger.level < -1 {
logger.level = -1
}
logger.maxLevel = logger.level
loggerMap.loggerMap[name] = logger
if circularBuffer.CheckNeverLogged() {
logger.Println("New log directory")
}
if *logAtStartup {
logger.Println("Startup")
}
return logger
}
func (l *Logger) checkAuth(authInfo *srpc.AuthInformation) error {
if authInfo.HaveMethodAccess {
return nil
}
if accessChecker := l.accessChecker; accessChecker == nil {
return errors.New("no access to resource")
} else if accessChecker(getCallerName(3), authInfo) {
return nil
} else {
return errors.New("no access to resource")
}
}
func (l *Logger) debug(level int16, v ...interface{}) {
if l.maxLevel >= level {
l.log(level, fmt.Sprint(v...), false)
}
}
func (l *Logger) debugf(level int16, format string, v ...interface{}) {
if l.maxLevel >= level {
l.log(level, fmt.Sprintf(format, v...), false)
}
}
func (l *Logger) debugln(level int16, v ...interface{}) {
if l.maxLevel >= level {
l.log(level, fmt.Sprintln(v...), false)
}
}
func (l *Logger) fatals(msg string) {
l.log(-1, msg, true)
os.Exit(1)
}
func (l *Logger) log(level int16, msg string, dying bool) {
buffer := &grabWriter{}
rawLogger := log.New(buffer, "", l.flags)
rawLogger.Output(4, msg)
if l.level >= level {
l.circularBuffer.Write(buffer.data)
}
recalculateLevels := false
l.mutex.Lock()
defer l.mutex.Unlock()
for streamer := range l.streamers {
if streamer.debugLevel >= level &&
(streamer.includeRegex == nil ||
streamer.includeRegex.Match(buffer.data)) &&
(streamer.excludeRegex == nil ||
!streamer.excludeRegex.Match(buffer.data)) {
select {
case streamer.output <- buffer.data:
default:
delete(l.streamers, streamer)
close(streamer.output)
recalculateLevels = true
}
}
}
if dying {
for streamer := range l.streamers {
delete(l.streamers, streamer)
close(streamer.output)
}
l.circularBuffer.Flush()
time.Sleep(time.Millisecond * 10)
} else if recalculateLevels {
l.updateMaxLevel()
}
}
func (l *Logger) makeStreamer(request proto.WatchRequest) (
*streamerType, error) {
if request.DebugLevel < -1 {
request.DebugLevel = -1
}
streamer := &streamerType{debugLevel: request.DebugLevel}
if request.ExcludeRegex != "" {
var err error
streamer.excludeRegex, err = regexp.Compile(request.ExcludeRegex)
if err != nil {
return nil, err
}
}
if request.IncludeRegex != "" {
var err error
streamer.includeRegex, err = regexp.Compile(request.IncludeRegex)
if err != nil {
return nil, err
}
}
return streamer, nil
}
func (l *Logger) panics(msg string) {
l.log(-1, msg, true)
panic(msg)
}
func (l *Logger) prints(msg string) {
l.log(-1, msg, false)
}
func (l *Logger) setLevel(maxLevel int16) {
if maxLevel < -1 {
maxLevel = -1
}
l.level = maxLevel
l.mutex.Lock()
l.updateMaxLevel()
l.mutex.Unlock()
}
func (l *Logger) updateMaxLevel() {
maxLevel := l.level
for streamer := range l.streamers {
if streamer.debugLevel > maxLevel {
maxLevel = streamer.debugLevel
}
}
l.maxLevel = maxLevel
}
func (l *Logger) watch(conn *srpc.Conn, streamer *streamerType) {
channel := make(chan []byte, 256)
streamer.output = channel
l.mutex.Lock()
l.streamers[streamer] = struct{}{}
l.updateMaxLevel()
l.mutex.Unlock()
timer := time.NewTimer(time.Millisecond * 100)
flushPending := false
closeNotifier := conn.GetCloseNotifier()
for keepGoing := true; keepGoing; {
select {
case <-closeNotifier:
keepGoing = false
break
case data, ok := <-channel:
if !ok {
keepGoing = false
break
}
if _, err := conn.Write(data); err != nil {
keepGoing = false
break
}
if !flushPending {
timer.Reset(time.Millisecond * 100)
flushPending = true
}
case <-timer.C:
if conn.Flush() != nil {
keepGoing = false
break
}
flushPending = false
}
}
if flushPending {
conn.Flush()
}
l.mutex.Lock()
delete(l.streamers, streamer)
l.updateMaxLevel()
l.mutex.Unlock()
// Drain the channel.
for {
select {
case <-channel:
default:
return
}
}
}
func (t *loggerMapT) getLogger(name string,
authInfo *srpc.AuthInformation) (*Logger, error) {
loggerMap.Lock()
defer loggerMap.Unlock()
if logger, ok := loggerMap.loggerMap[name]; !ok {
return nil, errors.New("unknown logger: " + name)
} else if err := logger.checkAuth(authInfo); err != nil {
return nil, err
} else {
return logger, nil
}
}
func (t *loggerMapT) Debug(conn *srpc.Conn,
request proto.DebugRequest, reply *proto.DebugResponse) error {
authInfo := conn.GetAuthInformation()
if logger, err := t.getLogger(request.Name, authInfo); err != nil {
return err
} else {
logger.Debugf(request.Level, "Logger.Debug(%d): %s\n",
request.Level, strings.Join(request.Args, " "))
return nil
}
}
func (t *loggerMapT) GetStackTrace(conn *srpc.Conn,
request proto.GetStackTraceRequest,
reply *proto.GetStackTraceResponse) error {
buffer := make([]byte, 1<<20)
nBytes := runtime.Stack(buffer, true)
reply.Data = buffer[:nBytes]
return nil
}
func (t *loggerMapT) Print(conn *srpc.Conn,
request proto.PrintRequest,
reply *proto.PrintResponse) error {
authInfo := conn.GetAuthInformation()
if logger, err := t.getLogger(request.Name, authInfo); err != nil {
return err
} else {
logger.Println("Logger.Print():", strings.Join(request.Args, " "))
return nil
}
}
func (t *loggerMapT) SetDebugLevel(conn *srpc.Conn,
request proto.SetDebugLevelRequest,
reply *proto.SetDebugLevelResponse) error {
authInfo := conn.GetAuthInformation()
if logger, err := t.getLogger(request.Name, authInfo); err != nil {
return err
} else {
logger.Printf("Logger.SetDebugLevel(%d)\n", request.Level)
logger.SetLevel(request.Level)
return nil
}
}
func (t *loggerMapT) Watch(conn *srpc.Conn) error {
var request proto.WatchRequest
if err := conn.Decode(&request); err != nil {
return err
}
authInfo := conn.GetAuthInformation()
if logger, err := t.getLogger(request.Name, authInfo); err != nil {
return conn.Encode(proto.WatchResponse{Error: err.Error()})
} else if streamer, err := logger.makeStreamer(request); err != nil {
return conn.Encode(proto.WatchResponse{Error: err.Error()})
} else {
if err := conn.Encode(proto.WatchResponse{}); err != nil {
return err
}
if err := conn.Flush(); err != nil {
return err
}
logger.watch(conn, streamer)
return srpc.ErrorCloseClient
}
}
func (l *Logger) writeHtml(writer io.Writer) {
if numPanics := srpc.GetNumPanicedCalls(); numPanics > 0 {
var suffix string
if numPanics > 1 {
suffix = "s"
}
fmt.Fprintf(writer,
"<p><font color=\"red\">SRPC Server recorded %d call%s which paniced</font><br>",
numPanics, suffix)
}
l.circularBuffer.WriteHtml(writer)
}