Module: SSEClient

Defined in:
lib/a2a_test_framework/sse_client.rb

Overview

Simple SSE client for testing streaming endpoints. Reads SSE events from a chunked HTTP response.

Defined Under Namespace

Classes: Event

Class Method Summary collapse

Class Method Details

.collect_events(method, path, body: nil, timeout_seconds: 10, headers: {}) ⇒ Object 



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# File 'lib/a2a_test_framework/sse_client.rb', line 27

def self.collect_events(method, path, body: nil, timeout_seconds: 10, headers: {})
  uri = URI("#{BASE_URL}#{path}")
  events = []

  Timeout.timeout(timeout_seconds) do
    Net::HTTP.start(uri.host, uri.port, use_ssl: uri.scheme == "https") do |http|
      request = case method
                when :post
                  req = Net::HTTP::Post.new(uri.path)
                  req["Content-Type"] = "application/json"
                  req.body = JSON.generate(body) if body
                  req
                when :get
                  Net::HTTP::Get.new(uri.request_uri)
                end

      request["Accept"] = "text/event-stream"
      headers.each { |k, v| request[k] = v }

      http.request(request) do |response|
        buffer = ""
        current_event = nil
        current_data_lines = []

        response.read_body do |chunk|
          buffer << chunk
          while (line_end = buffer.index("\n"))
            line = buffer.slice!(0..line_end).chomp("\r\n").chomp("\n")

            if line.empty?
              # Empty line = event boundary
              if current_data_lines.any?
                data_str = current_data_lines.join("\n")
                parsed = begin
                  JSON.parse(data_str)
                rescue JSON::ParserError
                  data_str
                end
                events << Event.new(
                  data: parsed,
                  event: current_event
                )
              end
              current_event = nil
              current_data_lines = []
            elsif line.start_with?("data: ")
              current_data_lines << line.sub(/\Adata: /, "")
            elsif line.start_with?("data:")
              current_data_lines << line.sub(/\Adata:/, "")
            elsif line.start_with?("event: ")
              current_event = line.sub(/\Aevent: /, "")
            elsif line.start_with?("id: ")
              # ignored for now
            end
          end
        end

        # Handle any remaining data in buffer
        if current_data_lines.any?
          data_str = current_data_lines.join("\n")
          parsed = begin
            JSON.parse(data_str)
          rescue JSON::ParserError
            data_str
          end
          events << Event.new(data: parsed, event: current_event)
        end
      end
    end
  end

  events
rescue Timeout::Error
  events
rescue EOFError, IOError, Errno::ECONNRESET
  events
end

.get_stream(path, timeout_seconds: 10, headers: {}) ⇒ Object

GET a streaming endpoint and collect SSE events. Returns an array of Event structs.



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# File 'lib/a2a_test_framework/sse_client.rb', line 21

def self.get_stream(path, timeout_seconds: 10, headers: {})
  collect_events(:get, path, timeout_seconds: timeout_seconds, headers: headers)
end

.post_stream(path, body, timeout_seconds: 10, headers: {}) ⇒ Object

POST to a streaming endpoint and collect SSE events. Returns an array of Event structs.



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# File 'lib/a2a_test_framework/sse_client.rb', line 15

def self.post_stream(path, body, timeout_seconds: 10, headers: {})
  collect_events(:post, path, body: body, timeout_seconds: timeout_seconds, headers: headers)
end