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parser_channel.go
232 lines (191 loc) · 4.35 KB
/
parser_channel.go
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package sockety
import (
"errors"
"github.com/google/uuid"
"github.com/sockety/sockety-go/internal/buffer_pool"
"io"
)
// TODO: Include reference to connection
// TODO: Consider single byte array instead of fields list - it should decrease size (i.e. for simple "ping" action - from 80B to ~40B)
type message struct {
data MessageData
stream MessageStream
id uuid.UUID
action string
totalFilesSize uint64
filesCount uint32
expectsResponse bool
}
func (m *message) Id() uuid.UUID {
return m.id
}
func (m *message) Action() string {
return m.action
}
func (m *message) DataSize() uint64 {
return m.data.Size()
}
func (m *message) Data() MessageData {
return m.data
}
func (m *message) TotalFilesSize() uint64 {
return m.totalFilesSize
}
func (m *message) FilesCount() uint32 {
return m.filesCount
}
func (m *message) Stream() MessageStream {
return m.stream
}
func (m *message) ExpectsResponse() bool {
return m.expectsResponse
}
type response struct {
expectsResponse bool
stream io.Reader
}
type ParserChannelOptions struct {
}
type ParserChannelResult interface {
message | Response
}
type parserChannel struct {
message *message
response *response
data *messageData
stream *messageStream
messageReader *messageReader
}
func newParserChannel() *parserChannel {
return &parserChannel{
messageReader: newMessageReader(),
}
}
func (p *parserChannel) DataDone() bool {
return p.data == nil || p.data.Done()
}
func (p *parserChannel) StreamDone() bool {
return p.stream == nil || p.stream.Done()
}
func (p *parserChannel) Idle() bool {
return p.message == nil
}
func (p *parserChannel) InitMessage(expectsResponse bool, hasStream bool) error {
if !p.Idle() {
return errors.New("channel is already processing")
}
var stream *messageStream
if hasStream {
stream = newMessageStream()
}
p.message = &message{
expectsResponse: expectsResponse,
stream: stream,
}
return nil
}
func (p *parserChannel) InitResponse(expectsResponse bool, hasStream bool) error {
if !p.Idle() {
return errors.New("channel is already processing")
}
var stream *messageStream
if hasStream {
stream = newMessageStream()
}
p.response = &response{
expectsResponse: expectsResponse,
stream: stream,
}
return nil
}
func (p *parserChannel) maybeEnd() {
// TODO: It should get rid of message only when all sub-data has been processed too
if p.DataDone() && p.StreamDone() {
p.message = nil
p.data = nil
p.stream = nil
}
}
func (p *parserChannel) processMessage(b BufferedReader) (Message, error) {
done, err := p.messageReader.Get(p.message, b)
if err != nil && err != ErrNotReady {
return nil, err
} else if !done {
return nil, nil
}
m := p.message
if m.data.Size() > 0 {
p.data = m.data.(*messageData)
}
if m.stream != nil {
p.stream = m.stream.(*messageStream)
}
p.maybeEnd()
return m, nil
}
func (p *parserChannel) processResponse(b BufferedReader) (Response, error) {
return nil, errors.New("not implemented")
}
func (p *parserChannel) Process(b BufferedReader) (ParserChannelResult, error) {
if p.message != nil {
return p.processMessage(b)
} else if p.response != nil {
return p.processResponse(b)
} else {
return nil, errors.New("channel is not processing")
}
}
func (p *parserChannel) ProcessData(b BufferedReader) error {
if p.DataDone() {
return errors.New("channel does not expect any Data")
}
for {
step := b.Len()
if step == 0 {
p.maybeEnd()
return nil
}
// TODO: make it configurable?
if step > 65_536 {
step = 65_536
}
buf := buffer_pool.ObtainUnsafe(step)
_, err := b.Read(buf.B) // TODO: Write directly to p.data?
if err != nil {
return err
}
err = p.data.push(buf)
if err != nil {
return err
}
}
}
func (p *parserChannel) ProcessStream(b BufferedReader) error {
if p.StreamDone() {
return errors.New("channel does not expect any Stream")
}
for {
step := b.Len()
if step == 0 {
return nil
}
// TODO: make it configurable?
if step > 65_536 {
step = 65_536
}
buf := buffer_pool.ObtainUnsafe(step)
_, err := b.Read(buf.B) // TODO: Write directly to p.stream?
if err != nil {
return err
}
err = p.stream.push(buf)
if err != nil {
return err
}
}
}
func (p *parserChannel) EndStream() error {
err := p.stream.close()
p.maybeEnd()
return err
}