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117 lines
3.7 KiB
117 lines
3.7 KiB
// Copyright 2014 Manu Martinez-Almeida. All rights reserved.
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// Use of this source code is governed by a MIT style
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// license that can be found in the LICENSE file.
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package sse
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import (
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"bytes"
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"io"
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"io/ioutil"
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)
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type decoder struct {
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events []Event
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}
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func Decode(r io.Reader) ([]Event, error) {
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var dec decoder
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return dec.decode(r)
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}
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func (d *decoder) dispatchEvent(event Event, data string) {
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dataLength := len(data)
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if dataLength > 0 {
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//If the data buffer's last character is a U+000A LINE FEED (LF) character, then remove the last character from the data buffer.
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data = data[:dataLength-1]
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dataLength--
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}
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if dataLength == 0 && event.Event == "" {
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return
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}
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if event.Event == "" {
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event.Event = "message"
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}
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event.Data = data
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d.events = append(d.events, event)
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}
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func (d *decoder) decode(r io.Reader) ([]Event, error) {
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buf, err := ioutil.ReadAll(r)
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if err != nil {
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return nil, err
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}
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var currentEvent Event
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var dataBuffer *bytes.Buffer = new(bytes.Buffer)
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// TODO (and unit tests)
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// Lines must be separated by either a U+000D CARRIAGE RETURN U+000A LINE FEED (CRLF) character pair,
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// a single U+000A LINE FEED (LF) character,
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// or a single U+000D CARRIAGE RETURN (CR) character.
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lines := bytes.Split(buf, []byte{'\n'})
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for _, line := range lines {
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if len(line) == 0 {
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// If the line is empty (a blank line). Dispatch the event.
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d.dispatchEvent(currentEvent, dataBuffer.String())
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// reset current event and data buffer
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currentEvent = Event{}
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dataBuffer.Reset()
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continue
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}
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if line[0] == byte(':') {
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// If the line starts with a U+003A COLON character (:), ignore the line.
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continue
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}
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var field, value []byte
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colonIndex := bytes.IndexRune(line, ':')
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if colonIndex != -1 {
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// If the line contains a U+003A COLON character character (:)
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// Collect the characters on the line before the first U+003A COLON character (:),
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// and let field be that string.
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field = line[:colonIndex]
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// Collect the characters on the line after the first U+003A COLON character (:),
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// and let value be that string.
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value = line[colonIndex+1:]
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// If value starts with a single U+0020 SPACE character, remove it from value.
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if len(value) > 0 && value[0] == ' ' {
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value = value[1:]
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}
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} else {
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// Otherwise, the string is not empty but does not contain a U+003A COLON character character (:)
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// Use the whole line as the field name, and the empty string as the field value.
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field = line
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value = []byte{}
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}
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// The steps to process the field given a field name and a field value depend on the field name,
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// as given in the following list. Field names must be compared literally,
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// with no case folding performed.
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switch string(field) {
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case "event":
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// Set the event name buffer to field value.
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currentEvent.Event = string(value)
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case "id":
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// Set the event stream's last event ID to the field value.
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currentEvent.Id = string(value)
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case "retry":
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// If the field value consists of only characters in the range U+0030 DIGIT ZERO (0) to U+0039 DIGIT NINE (9),
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// then interpret the field value as an integer in base ten, and set the event stream's reconnection time to that integer.
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// Otherwise, ignore the field.
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currentEvent.Id = string(value)
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case "data":
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// Append the field value to the data buffer,
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dataBuffer.Write(value)
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// then append a single U+000A LINE FEED (LF) character to the data buffer.
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dataBuffer.WriteString("\n")
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default:
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//Otherwise. The field is ignored.
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continue
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}
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}
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// Once the end of the file is reached, the user agent must dispatch the event one final time.
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d.dispatchEvent(currentEvent, dataBuffer.String())
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return d.events, nil
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}
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