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appender.go
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appender.go
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package logfjournald
import (
"github.com/ssgreg/journald"
"github.com/ssgreg/logf"
)
// AppenderCloseFunc allows to close underlying journal at the end of
// Appender life cycle.
type AppenderCloseFunc func() error
// NewAppender creates the new instance of journal appender with the given
// Encoder.
func NewAppender(enc logf.Encoder) (logf.Appender, AppenderCloseFunc) {
a := &appender{
j: &journald.Journal{},
enc: enc,
buf: logf.NewBufferWithCapacity(logf.PageSize * 2),
}
return a, AppenderCloseFunc(func() error {
return a.Close()
})
}
type appender struct {
j *journald.Journal
enc logf.Encoder
buf *logf.Buffer
}
func (a *appender) Append(entry logf.Entry) error {
err := a.enc.Encode(a.buf, entry)
if err != nil {
return err
}
if a.buf.Len() > logf.PageSize {
a.Flush()
}
return nil
}
func (a *appender) Sync() (err error) {
return a.Flush()
}
func (a *appender) Flush() error {
if a.buf.Len() != 0 {
defer a.buf.Reset()
return a.j.WriteMsg(a.buf.Bytes())
}
return nil
}
func (a *appender) Close() error {
defer func() {
a.j = nil
}()
return a.j.Close()
}