101 lines
1.9 KiB
Go
101 lines
1.9 KiB
Go
package frame
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import (
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"bufio"
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"io"
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)
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// slices used to write frames
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var (
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colonSlice = []byte{58} // colon ':'
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crlfSlice = []byte{13, 10} // CR-LF
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newlineSlice = []byte{10} // newline (LF)
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nullSlice = []byte{0} // null character
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)
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// Writes STOMP frames to an underlying io.Writer.
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type Writer struct {
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writer *bufio.Writer
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}
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// Creates a new Writer object, which writes to an underlying io.Writer.
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func NewWriter(writer io.Writer) *Writer {
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return NewWriterSize(writer, 4096)
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}
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func NewWriterSize(writer io.Writer, bufferSize int) *Writer {
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return &Writer{writer: bufio.NewWriterSize(writer, bufferSize)}
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}
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// Write the contents of a frame to the underlying io.Writer.
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func (w *Writer) Write(f *Frame) error {
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var err error
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if f == nil {
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// nil frame means send a heart-beat LF
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_, err = w.writer.Write(newlineSlice)
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if err != nil {
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return err
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}
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} else {
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_, err = w.writer.Write([]byte(f.Command))
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if err != nil {
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return err
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}
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_, err = w.writer.Write(newlineSlice)
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if err != nil {
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return err
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}
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//println("TX:", f.Command)
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if f.Header != nil {
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for i := 0; i < f.Header.Len(); i++ {
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key, value := f.Header.GetAt(i)
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//println(" ", key, ":", value)
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_, err = replacerForEncodeValue.WriteString(w.writer, key)
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if err != nil {
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return err
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}
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_, err = w.writer.Write(colonSlice)
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if err != nil {
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return err
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}
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_, err = replacerForEncodeValue.WriteString(w.writer, value)
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if err != nil {
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return err
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}
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_, err = w.writer.Write(newlineSlice)
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if err != nil {
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return err
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}
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}
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}
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_, err = w.writer.Write(newlineSlice)
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if err != nil {
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return err
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}
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if len(f.Body) > 0 {
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_, err = w.writer.Write(f.Body)
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if err != nil {
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return err
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}
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}
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// write the final null (0) byte
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_, err = w.writer.Write(nullSlice)
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if err != nil {
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return err
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}
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}
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err = w.writer.Flush()
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if err != nil {
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return err
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}
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return nil
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}
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