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package dlog
import (
"context"
"fmt"
"os"
"strings"
"sync"
"time"
"github.com/mimecast/dtail/internal/color/brush"
"github.com/mimecast/dtail/internal/config"
"github.com/mimecast/dtail/internal/io/dlog/loggers"
"github.com/mimecast/dtail/internal/io/pool"
"github.com/mimecast/dtail/internal/protocol"
)
// Client is the log handler for the client packages.
var Client *DLog
// Server is the log handler for the server packages.
var Server *DLog
// Common is the log handler for all other packages.
var Common *DLog
var mutex sync.Mutex
var started bool
// Start logger(s).
func Start(ctx context.Context, wg *sync.WaitGroup, sourceProcess source, logLevel string) {
mutex.Lock()
defer mutex.Unlock()
if started {
Common.FatalPanic("Logger already started")
}
level := newLevel(logLevel)
switch sourceProcess {
case CLIENT:
// This is a DTail client process running.
impl := loggers.FOUT
Client = New(CLIENT, CLIENT, impl, level)
Server = New(CLIENT, SERVER, impl, level)
Common = Client
case SERVER:
// This is a DTail server process running.
impl := loggers.FILE
Client = New(SERVER, CLIENT, impl, level)
Server = New(SERVER, SERVER, impl, level)
Common = Server
}
var wg2 sync.WaitGroup
wg2.Add(2)
Client.start(ctx, &wg2)
Server.start(ctx, &wg2)
started = true
go rotation(ctx)
go func() {
wg2.Wait()
wg.Done()
}()
}
// DLog is the DTail logger.
type DLog struct {
logger loggers.Logger
// Is this a DTail server or client process logging?
sourceProcess source
// Is this a DTail server or client package logging? In serverless mode
// the client can also execute code from the server package.
sourcePackage source
// Max log level to log.
maxLevel level
// Current hostname.
hostname string
}
// New creates a new DTail logger.
func New(sourceProcess, sourcePackage source, impl loggers.Impl, maxLevel level) *DLog {
hostname, err := os.Hostname()
if err != nil {
panic(err)
}
return &DLog{
logger: loggers.Factory(sourceProcess.String(), impl),
sourceProcess: sourceProcess,
sourcePackage: sourcePackage,
maxLevel: maxLevel,
hostname: hostname,
}
}
func (d *DLog) start(ctx context.Context, wg *sync.WaitGroup) {
go func() {
defer wg.Done()
var wg2 sync.WaitGroup
wg2.Add(1)
d.logger.Start(ctx, &wg2)
<-ctx.Done()
wg2.Wait()
}()
}
func (d *DLog) log(level level, args []interface{}) string {
if d.maxLevel < level {
return ""
}
sb := pool.BuilderBuffer.Get().(*strings.Builder)
defer pool.RecycleBuilderBuffer(sb)
now := time.Now()
switch d.sourceProcess {
case CLIENT:
sb.WriteString(d.sourcePackage.String())
sb.WriteString(protocol.FieldDelimiter)
sb.WriteString(d.hostname)
sb.WriteString(protocol.FieldDelimiter)
sb.WriteString(level.String())
default:
sb.WriteString(level.String())
sb.WriteString(protocol.FieldDelimiter)
sb.WriteString(now.Format("20060102-150405"))
}
sb.WriteString(protocol.FieldDelimiter)
d.writeArgStrings(sb, args)
message := sb.String()
if !config.Client.TermColorsEnable || !d.logger.SupportsColors() {
d.logger.Log(now, message)
return message
}
d.logger.LogWithColors(now, message, brush.Colorfy(message))
return message
}
func (d *DLog) writeArgStrings(sb *strings.Builder, args []interface{}) {
for i, arg := range args {
if i > 0 {
sb.WriteString(protocol.FieldDelimiter)
}
switch v := arg.(type) {
case string:
sb.WriteString(v)
case error:
sb.WriteString(v.Error())
default:
sb.WriteString(fmt.Sprintf("%v", v))
}
}
}
func (d *DLog) FatalPanic(args ...interface{}) {
d.log(FATAL, args)
d.logger.Flush()
panic("Not recovering from this fatal error...")
}
func (d *DLog) Fatal(args ...interface{}) string {
return d.log(FATAL, args)
}
func (d *DLog) Error(args ...interface{}) string {
return d.log(ERROR, args)
}
func (d *DLog) Warn(args ...interface{}) string {
return d.log(WARN, args)
}
func (d *DLog) Info(args ...interface{}) string {
if d.sourcePackage == SERVER && d.sourceProcess != CLIENT {
// This can be dtail client in serverless mode. In this case log all
// info server messages as verbose.
return d.log(VERBOSE, args)
}
return d.log(INFO, args)
}
func (d *DLog) Verbose(args ...interface{}) string {
return d.log(VERBOSE, args)
}
func (d *DLog) Debug(args ...interface{}) string {
return d.log(DEBUG, args)
}
func (d *DLog) Trace(args ...interface{}) string {
return d.log(TRACE, args)
}
func (d *DLog) Devel(args ...interface{}) string {
return d.log(DEVEL, args)
}
func (d *DLog) Raw(message string) string {
if !config.Client.TermColorsEnable || !d.logger.SupportsColors() {
d.logger.Log(time.Now(), message)
return message
}
d.logger.LogWithColors(time.Now(), message, brush.Colorfy(message))
return message
}
func (d *DLog) Mapreduce(table string, data map[string]interface{}) string {
args := make([]interface{}, len(data)+1)
// TODO: mC compatible SERVER mapreduce fields, no MAPREDUCE keyword in CLIENT mode
args[0] = fmt.Sprintf("%s:%s", "MAPREDUCE", strings.ToUpper(table))
i := 1
for k, v := range data {
args[i] = fmt.Sprintf("%s=%v", k, v)
i++
}
return d.log(INFO, args)
}
func (d *DLog) Flush() { d.logger.Flush() }
func (d *DLog) Pause() { d.logger.Pause() }
func (d *DLog) Resume() { d.logger.Resume() }
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