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moby--moby/pkg/jsonlog/jsonlog.go
Erik Hollensbe 5cdb9c8aca utils.Debugf -> log.Printf, move jsonlog to own package.
Docker-DCO-1.1-Signed-off-by: Erik Hollensbe <github@hollensbe.org> (github: erikh)
2014-08-06 16:39:01 -07:00

45 lines
852 B
Go

package jsonlog
import (
"encoding/json"
"fmt"
"io"
"log"
"time"
)
type JSONLog struct {
Log string `json:"log,omitempty"`
Stream string `json:"stream,omitempty"`
Created time.Time `json:"time"`
}
func (jl *JSONLog) Format(format string) (string, error) {
if format == "" {
return jl.Log, nil
}
if format == "json" {
m, err := json.Marshal(jl)
return string(m), err
}
return fmt.Sprintf("[%s] %s", jl.Created.Format(format), jl.Log), nil
}
func WriteLog(src io.Reader, dst io.WriteCloser, format string) error {
dec := json.NewDecoder(src)
for {
l := &JSONLog{}
if err := dec.Decode(l); err == io.EOF {
return nil
} else if err != nil {
log.Printf("Error streaming logs: %s", err)
return err
}
line, err := l.Format(format)
if err != nil {
return err
}
fmt.Fprintf(dst, "%s", line)
}
}