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snapshot.go
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/
snapshot.go
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package snapshot
import (
"encoding/gob"
"io"
"github.com/flynn/flynn/pkg/syslog/rfc5424"
)
// WriteTo writes a snapshot of the buffers to the writer. The partitioning of
// messages is not retained. The writer is left open.
func WriteTo(buffers [][]*rfc5424.Message, w io.Writer) error {
enc := gob.NewEncoder(w)
return writeTo(buffers, enc)
}
func writeTo(buffers [][]*rfc5424.Message, enc *gob.Encoder) error {
for _, buf := range buffers {
for _, msg := range buf {
if err := enc.Encode(msg); err != nil {
return err
}
}
}
return nil
}
// StreamTo writes a snapshot of the buffers to the writer, then writes
// messages from the channel to the writer. The writer is left open.
func StreamTo(buffers [][]*rfc5424.Message, msgc <-chan *rfc5424.Message, w io.Writer) error {
enc := gob.NewEncoder(w)
if err := writeTo(buffers, enc); err != nil {
return err
}
for msg := range msgc {
if err := enc.Encode(msg); err != nil {
return err
}
}
return nil
}
type Scanner struct {
dec *gob.Decoder
err error
// Current Message, updated on each call to Scan.
Message *rfc5424.Message
}
// NewScanner returns a new Scanner reading from r.
func NewScanner(r io.Reader) *Scanner {
return &Scanner{dec: gob.NewDecoder(r)}
}
func (s *Scanner) Scan() bool {
msg := &rfc5424.Message{}
err := s.dec.Decode(msg)
if err != nil {
s.err = err
return false
}
s.Message = msg
return true
}
func (s *Scanner) Err() error {
if s.err != io.EOF {
return s.err
}
return nil
}