Class: PythonWebClient

Inherits:
Object
  • Object
show all
Defined in:
app/services/python_web_client.rb

Overview

require ‘websocket-client-simple’

Class Method Summary collapse

Class Method Details

.conn ⇒ Object 



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# File 'app/services/python_web_client.rb', line 90

def conn
  @conn ||= Faraday.new(url: Rails.application.config.python_web_host) do |faraday|
    faraday.request :json
    faraday.response :json, content_type: /\bjson$/
    faraday.response :raise_error
    # faraday.use FaradayCustomErrorMiddleware
    faraday.headers['Accept'] = 'application/json'
    faraday.adapter Faraday.default_adapter
    faraday.options.timeout = 180 # Set timeout to 3 minutes
    faraday.options.open_timeout = 180 # Set open timeout to 3 minutes
  end
end

.get(path:, params: {}) ⇒ Object 



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# File 'app/services/python_web_client.rb', line 5

def get(path:, params: {})
  Rails.logger.info "PythonWebClient GET: #{path} with params: #{params}"
  response = conn.get(path, params)
  soft_parse(response.body)
end

.parse_or_nil(body) ⇒ Object 



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# File 'app/services/python_web_client.rb', line 109

def parse_or_nil(body)
  JSON.parse(body)
rescue StandardError
  nil
end

.post(path:, params: {}, &_block) ⇒ Object 



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# File 'app/services/python_web_client.rb', line 11

def post(path:, params: {}, &_block)
  Rails.logger.info "PythonWebClient POST: #{path} with params: #{params}"

  if block_given?
    # Streaming mode
    conn.post do |req|
      req.url path
      req.body = params.to_json
      req.headers['Content-Type'] = 'application/json'
      req.headers['Accept'] = 'text/event-stream' if params[:stream] # Add SSE Accept header

      req.options.on_data = proc do |chunk, _size, _env|
        # Process each chunk as it arrives
        chunk_str = chunk.to_s.strip
        if chunk_str.start_with?('data: ') && chunk_str.length > 6
          # Extract the JSON data part from the SSE format (data: {...})
          json_str = chunk_str.sub(/^data: /, '').strip
          begin
            yield json_str
          rescue StandardError => e
            Rails.logger.error "Error processing chunk: #{e.message}"
          end
        elsif chunk_str.length > 0 && chunk_str != "\n" && !chunk_str.start_with?(':')
          # Handle non-SSE format as fallback
          yield chunk_str
        end
      end
    end
    nil # Return nil when streaming since data is processed in the block
  else
    # Regular mode
    response = conn.post(path, params)
    soft_parse(response.body)
  end
end

.soft_parse(body) ⇒ Object 



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# File 'app/services/python_web_client.rb', line 103

def soft_parse(body)
  JSON.parse(body)
rescue StandardError
  body || {}
end

.websocket(path:, &block) ⇒ Object 



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# File 'app/services/python_web_client.rb', line 47

def websocket(path:, &block)
  ws_url = "#{Rails.application.config.python_web_host.sub(/^http/, 'ws')}#{path}"
  ws = WebSocket::Client::Simple.connect(ws_url)
  retry_count = 0
  retry_delay = 0.5
  max_retries = 5

  ws.on :open do
    Rails.logger.info "WebSocket connection established to #{ws_url}"
  end

  ws.on :message do |msg|
    if msg.data == 'ping'
      ws.send('pong')
    else
      msg_data = PythonWebClient.parse_or_nil(msg.data)
      block.call(msg_data) if msg_data
    end
  end

  ws.on :close do |_e|
    # Trigger reconnection unless max retries exceeded
    if retry_count < max_retries
      retry_count += 1
      Rails.logger.info "Attempting to reconnect (#{retry_count}/#{max_retries}) to #{ws_url}"
      sleep retry_delay
      raise StandardError, 'WebSocket closed, retrying'
    else
      Rails.logger.error "Max reconnection attempts (#{max_retries}) reached for #{ws_url}"
    end
  end

  ws.on :error do |e|
    Rails.logger.error "WebSocket error: #{e.message}"
    raise StandardError, 'WebSocket error'
  end

  ws
rescue StandardError => e
  Rails.logger.error "WebSocket connection error: #{e.message}"
  raise
end