github.com/grange74/docker@v1.6.0-rc3/pkg/jsonlog/jsonlog.go (about)

     1  package jsonlog
     2  
     3  import (
     4  	"encoding/json"
     5  	"fmt"
     6  	"io"
     7  	"time"
     8  
     9  	log "github.com/Sirupsen/logrus"
    10  )
    11  
    12  type JSONLog struct {
    13  	Log     string    `json:"log,omitempty"`
    14  	Stream  string    `json:"stream,omitempty"`
    15  	Created time.Time `json:"time"`
    16  }
    17  
    18  func (jl *JSONLog) Format(format string) (string, error) {
    19  	if format == "" {
    20  		return jl.Log, nil
    21  	}
    22  	if format == "json" {
    23  		m, err := json.Marshal(jl)
    24  		return string(m), err
    25  	}
    26  	return fmt.Sprintf("%s %s", jl.Created.Format(format), jl.Log), nil
    27  }
    28  
    29  func (jl *JSONLog) Reset() {
    30  	jl.Log = ""
    31  	jl.Stream = ""
    32  	jl.Created = time.Time{}
    33  }
    34  
    35  func WriteLog(src io.Reader, dst io.Writer, format string) error {
    36  	dec := json.NewDecoder(src)
    37  	l := &JSONLog{}
    38  	for {
    39  		if err := dec.Decode(l); err == io.EOF {
    40  			return nil
    41  		} else if err != nil {
    42  			log.Printf("Error streaming logs: %s", err)
    43  			return err
    44  		}
    45  		line, err := l.Format(format)
    46  		if err != nil {
    47  			return err
    48  		}
    49  		if _, err := io.WriteString(dst, line); err != nil {
    50  			return err
    51  		}
    52  		l.Reset()
    53  	}
    54  }