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stream.go
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stream.go
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package ssg
import (
"io"
"time"
"github.com/jhunt/ssg/pkg/rand"
)
func (s *stream) lease(life time.Duration) {
s.secret = rand.String(32)
s.leased = time.Now()
s.expires = s.leased.Add(life)
s.renewal = life
}
func (s *stream) authorize(token string) bool {
if s.authorized(token) {
s.renew()
return true
}
return false
}
func (s *stream) authorized(token string) bool {
return s.secret == token && !s.expired()
}
func (s *stream) expired() bool {
return !s.expires.After(time.Now())
}
func (s *stream) renew() {
s.expires = time.Now().Add(s.renewal)
}
func (s *stream) Read(b []byte) (int, error) {
n, err := s.reader.Read(b)
if err != nil && err != io.EOF {
return n, err
}
s.compressed.set(s.reader.ReadCompressed())
s.uncompressed.set(s.reader.ReadUncompressed())
s.bucket.metrics.OutFront(s.uncompressed.delta())
s.bucket.metrics.InBack(s.compressed.delta())
return n, err
}
func (s *stream) Write(b []byte) (int, error) {
n, err := s.writer.Write(b)
if err != nil {
return n, err
}
s.segments++
s.bucket.metrics.Segment(n)
s.compressed.set(s.writer.WroteCompressed())
s.uncompressed.set(s.writer.WroteUncompressed())
s.bucket.metrics.InFront(s.uncompressed.delta())
s.bucket.metrics.OutBack(s.compressed.delta())
return n, nil
}
func (s *stream) Close() error {
if s.writer != nil {
err := s.writer.Close()
if err != nil {
return err
}
s.compressed.set(s.writer.WroteCompressed())
s.uncompressed.set(s.writer.WroteUncompressed())
s.bucket.metrics.OutBack(s.compressed.delta())
}
if s.reader != nil {
err := s.reader.Close()
if err != nil {
return err
}
s.compressed.set(s.reader.ReadCompressed())
s.uncompressed.set(s.reader.ReadUncompressed())
s.bucket.metrics.OutFront(s.compressed.delta())
s.bucket.metrics.InBack(s.compressed.delta())
}
return nil
}
func (s *stream) Cancel() error {
if s.writer != nil {
return s.writer.Cancel()
}
if s.reader != nil {
return s.reader.Close()
}
return nil
}