77 regels
1.7 KiB
Go
77 regels
1.7 KiB
Go
package telebit
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import (
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"fmt"
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"io"
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"os"
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"git.rootprojects.org/root/telebit/internal/dbg"
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)
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// Decoder handles a Reader stream containing mplexy-encoded clients
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type Decoder struct {
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in io.Reader
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bufferSize int
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}
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// NewDecoder returns an initialized Decoder
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func NewDecoder(rin io.Reader) *Decoder {
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return &Decoder{
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in: rin,
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bufferSize: defaultBufferSize,
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}
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}
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// Decode will call WriteMessage as often as addressable data exists,
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// reading up to bufferSize (default 8192) at a time
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// (header + data, though headers are often sent separately from data).
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func (d *Decoder) Decode(out Router) error {
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p := NewParser(out)
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rx := make(chan []byte)
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rxErr := make(chan error)
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go func() {
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for {
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b := make([]byte, d.bufferSize)
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n, err := d.in.Read(b)
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if dbg.Debug {
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fmt.Fprintf(os.Stderr, "[debug] [decoder] [srv] Tunnel read %d %s\n", n, dbg.Trunc(b, n))
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}
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if n > 0 {
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rx <- b[:n]
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}
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if nil != err {
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fmt.Fprintf(os.Stderr, "[decoder] [srv] Tunnel read err: %s\n", err)
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rxErr <- err
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return
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}
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}
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}()
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for {
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select {
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case b := <-rx:
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n, err := p.Write(b)
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if dbg.Debug {
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fmt.Fprintf(os.Stderr, "[debug] [decoder] [srv] Tunnel write %d %d %s\n", n, len(b), dbg.Trunc(b, len(b)))
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}
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// TODO BUG: handle when 'n' bytes written is less than len(b)
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if nil != err {
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fmt.Fprintf(os.Stderr, "[decoder] [srv] Tunnel write err: %s\n", err)
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// an error to write represents an unrecoverable error,
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// not just a downstream client error
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//d.in.Close()
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return err
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}
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case err := <-rxErr:
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//d.in.Close()
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if io.EOF == err {
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// it can be assumed that err will close though, right
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return nil
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}
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return err
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}
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}
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}
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