/
nettrace.go
108 lines (96 loc) · 1.88 KB
/
nettrace.go
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package nettrace
import (
"errors"
"io"
)
type Stream struct {
dec *Decoder
EventHandler func(*Blob) error
MetadataHandler func(*Metadata) error
StackBlockHandler func(*StackBlock) error
SequencePointBlockHandler func(*SequencePointBlock) error
}
func NewStream(r io.Reader) *Stream {
return &Stream{dec: NewDecoder(r)}
}
func (s *Stream) Open() (*Trace, error) {
return s.dec.OpenTrace()
}
func (s *Stream) Next() error {
var o Object
if err := s.dec.Decode(&o); err != nil {
return err
}
switch o.Type {
case ObjectTypeSPBlock:
if s.SequencePointBlockHandler == nil {
return nil
}
block, err := SequencePointBlockFromObject(o)
if err != nil {
return err
}
return s.SequencePointBlockHandler(block)
case ObjectTypeStackBlock:
if s.StackBlockHandler == nil {
return nil
}
block, err := StackBlockFromObject(o)
if err != nil {
return err
}
return s.StackBlockHandler(block)
case ObjectTypeEventBlock:
if s.EventHandler == nil {
return nil
}
block, err := BlobBlockFromObject(o)
if err != nil {
return err
}
var blob Blob
for {
err = block.Next(&blob)
switch {
case err == nil:
case errors.Is(err, io.EOF):
return nil
default:
return err
}
if err = s.EventHandler(&blob); err != nil {
return err
}
}
case ObjectTypeMetadataBlock:
if s.MetadataHandler == nil {
return nil
}
block, err := BlobBlockFromObject(o)
if err != nil {
return err
}
var blob Blob
for {
err = block.Next(&blob)
switch {
case err == nil:
case errors.Is(err, io.EOF):
return nil
default:
return err
}
md, err := MetadataFromBlob(blob)
if err != nil {
return err
}
if err = s.MetadataHandler(md); err != nil {
return err
}
}
case ObjectTypeTrace:
return ErrUnexpectedObjectType
default:
return ErrInvalidObjectType
}
}