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moby--moby/pkg/jsonlog/jsonlog.go

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package jsonlog
import (
"encoding/json"
"fmt"
"io"
"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 (jl *JSONLog) Reset() {
jl.Log = ""
jl.Stream = ""
jl.Created = time.Time{}
}
func WriteLog(src io.Reader, dst io.Writer, format string, since time.Time) error {
dec := json.NewDecoder(src)
l := &JSONLog{}
for {
l.Reset()
if err := dec.Decode(l); err != nil {
if err == io.EOF {
return nil
}
return err
}
if !since.IsZero() && l.Created.Before(since) {
continue
}
line, err := l.Format(format)
if err != nil {
return err
}
if _, err := io.WriteString(dst, line); err != nil {
return err
}
}
}