98 lines
1.5 KiB
Go
98 lines
1.5 KiB
Go
|
package log
|
||
|
|
|
||
|
|
import (
|
||
|
|
"bufio"
|
||
|
|
"encoding/json"
|
||
|
|
"os"
|
||
|
|
"time"
|
||
|
|
)
|
||
|
|
|
||
|
|
// Should stream from OS
|
||
|
|
type osLog struct{}
|
||
|
|
|
||
|
|
type osStream struct {
|
||
|
|
stream chan Record
|
||
|
|
scanner *bufio.Reader
|
||
|
|
stop chan bool
|
||
|
|
}
|
||
|
|
|
||
|
|
// Read reads log entries from the logger
|
||
|
|
func (o *osLog) Read(...ReadOption) ([]Record, error) {
|
||
|
|
return []Record{}, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// Write writes records to log
|
||
|
|
func (o *osLog) Write(r Record) error {
|
||
|
|
b, _ := json.Marshal(r)
|
||
|
|
_, err := os.Stderr.Write(b)
|
||
|
|
return err
|
||
|
|
}
|
||
|
|
|
||
|
|
// Stream log records
|
||
|
|
func (o *osLog) Stream() (Stream, error) {
|
||
|
|
// read from standard error
|
||
|
|
scanner := bufio.NewReader(os.Stderr)
|
||
|
|
stream := make(chan Record, 128)
|
||
|
|
stop := make(chan bool)
|
||
|
|
|
||
|
|
go func() {
|
||
|
|
for {
|
||
|
|
select {
|
||
|
|
case <-stop:
|
||
|
|
return
|
||
|
|
default:
|
||
|
|
// 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(),
|
||
|
|
Value: line,
|
||
|
|
Metadata: make(map[string]string),
|
||
|
|
}
|
||
|
|
}
|
||
|
|
// send to stream
|
||
|
|
select {
|
||
|
|
case <-stop:
|
||
|
|
return
|
||
|
|
case stream <- r:
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}()
|
||
|
|
|
||
|
|
return &osStream{
|
||
|
|
stream: stream,
|
||
|
|
scanner: scanner,
|
||
|
|
stop: stop,
|
||
|
|
}, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *osStream) Chan() <-chan Record {
|
||
|
|
return o.stream
|
||
|
|
}
|
||
|
|
|
||
|
|
func (o *osStream) Stop() error {
|
||
|
|
select {
|
||
|
|
case <-o.stop:
|
||
|
|
return nil
|
||
|
|
default:
|
||
|
|
close(o.stop)
|
||
|
|
}
|
||
|
|
return nil
|
||
|
|
}
|
||
|
|
|
||
|
|
func NewLog(opts ...Option) Log {
|
||
|
|
return &osLog{}
|
||
|
|
}
|