Module: Manceps::SSEParser

Defined in:
lib/manceps/sse_parser.rb

Overview

Parser for Server-Sent Events streams.

Class Method Summary collapse

Class Method Details

.extract_json(body) ⇒ Object 



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# File 'lib/manceps/sse_parser.rb', line 10

def extract_json(body)
  return nil if body.nil? || body.strip.empty?

  data_lines = body.each_line.filter_map do |line|
    line.strip.start_with?('data:') ? line.strip.sub(/\Adata:\s?/, '') : nil
  end

  return nil if data_lines.empty?

  JSON.parse(data_lines.join)
end

.parse_events(body) ⇒ Object 



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# File 'lib/manceps/sse_parser.rb', line 22

def parse_events(body)
  return [] if body.nil? || body.strip.empty?

  events = []
  current = { id: nil, event: nil, data: [] }

  body.each_line do |raw_line|
    line = raw_line.chomp

    if line.empty?
      unless current[:data].empty?
        events << {
          id: current[:id],
          event: current[:event],
          data: current[:data].join("\n")
        }
      end
      current = { id: nil, event: nil, data: [] }
      next
    end

    if line.start_with?('id:')
      current[:id] = line.sub(/\Aid:\s?/, '')
    elsif line.start_with?('event:')
      current[:event] = line.sub(/\Aevent:\s?/, '')
    elsif line.start_with?('data:')
      current[:data] << line.sub(/\Adata:\s?/, '')
    end
  end

  # Flush any trailing event without a final blank line
  unless current[:data].empty?
    events << {
      id: current[:id],
      event: current[:event],
      data: current[:data].join("\n")
    }
  end

  events
end