prune util/log and user logger (#1237)

* prune util/log and user logger

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

* plaintext logger

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

* add newline

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>

debug/log/os.go

@@ -1,13 +1,7 @@
 package log
 
 import (
-	"bufio"
-	"encoding/json"
-	"io"
-	"os"
-	"strings"
 	"sync"
-	"time"
 
 	"github.com/google/uuid"
 	"github.com/micro/go-micro/v2/util/ring"
@@ -25,106 +19,10 @@ type osLog struct {
 
 type osStream struct {
 	stream chan Record
-	stop   chan bool
-}
-
-// watch io stream
-func (o *osLog) run() {
-	// save outputs
-	stdout := *os.Stdout
-	stderr := *os.Stderr
-
-	// new os pipe
-	r, w := io.Pipe()
-
-	// create new iopipes
-	r1, w1, _ := os.Pipe()
-	r2, w2, _ := os.Pipe()
-
-	// create tea readers
-	tee1 := io.TeeReader(r1, &stdout)
-	tee2 := io.TeeReader(r2, &stderr)
-
-	// start copying
-	go io.Copy(w, tee1)
-	go io.Copy(w, tee2)
-
-	// set default go log output
-	//log.SetOutput(w2)
-
-	// replace os stdout and os stderr
-	*os.Stdout = *w1
-	*os.Stderr = *w2
-
-	// this should short circuit everything
-	defer func() {
-		// reset stdout and stderr
-		*os.Stdout = stdout
-		*os.Stderr = stderr
-		//log.SetOutput(stderr)
-
-		// close all the outputs
-		r.Close()
-		r1.Close()
-		r2.Close()
-		w.Close()
-		w1.Close()
-		w2.Close()
-	}()
-
-	// read from standard error
-	scanner := bufio.NewReader(r)
-
-	for {
-		// read the line
-		line, err := scanner.ReadString('\n')
-		if err != nil {
-			return
-		}
-		// check if the line exists
-		if len(line) == 0 {
-			continue
-		}
-		// parse the record
-		var r Record
-		if line[0] == '{' {
-			json.Unmarshal([]byte(line), &r)
-		} else {
-			r = Record{
-				Timestamp: time.Now(),
-				Message:   strings.TrimSuffix(line, "\n"),
-				Metadata:  make(map[string]string),
-			}
-		}
-
-		o.Lock()
-
-		// write to the buffer
-		o.buffer.Put(r)
-
-		// check subs and send to stream
-		for id, sub := range o.subs {
-			// send to stream
-			select {
-			case <-sub.stop:
-				delete(o.subs, id)
-			case sub.stream <- r:
-				// send to stream
-			default:
-				// do not block
-			}
-		}
-
-		o.Unlock()
-	}
 }
 
 // Read reads log entries from the logger
 func (o *osLog) Read(...ReadOption) ([]Record, error) {
-	o.once.Do(func() {
-		go o.run()
-	})
-
 	var records []Record
 
 	// read the last 100 records
@@ -137,29 +35,18 @@ func (o *osLog) Read(...ReadOption) ([]Record, error) {
 
 // Write writes records to log
 func (o *osLog) Write(r Record) error {
-	o.once.Do(func() {
-		go o.run()
-	})
-
-	// generate output
-	out := o.format(r) + "\n"
-	_, err := os.Stderr.Write([]byte(out))
-	return err
+	o.buffer.Put(r)
+	return nil
 }
 
 // Stream log records
 func (o *osLog) Stream() (Stream, error) {
-	o.once.Do(func() {
-		go o.run()
-	})
-
 	o.Lock()
 	defer o.Unlock()
 
 	// create stream
 	st := &osStream{
 		stream: make(chan Record, 128),
-		stop:   make(chan bool),
 	}
 
 	// save stream
@@ -173,12 +60,6 @@ func (o *osStream) Chan() <-chan Record {
 }
 
 func (o *osStream) Stop() error {
-	select {
-	case <-o.stop:
-		return nil
-	default:
-		close(o.stop)
-	}
 	return nil
 }