Class: Snerdmq::SnerdQueue

Inherits:
Object
  • Object
show all
Defined in:
lib/snerdmq/queue.rb

Instance Method Summary collapse

Constructor Details

#initialize(binary_path: nil, storage_path: nil, max_local_shards: nil, max_workers: nil) ⇒ SnerdQueue

Returns a new instance of SnerdQueue.



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# File 'lib/snerdmq/queue.rb', line 8

def initialize(binary_path: nil, storage_path: nil, max_local_shards: nil, max_workers: nil)
  @binary_path = binary_path
  @storage_path = storage_path
  @max_local_shards = max_local_shards
  @max_workers = max_workers
  
  if @binary_path.nil?
    ext = RbConfig::CONFIG['host_os'].match?(/mswin|msys|mingw|cygwin|bccwin|wince|emc/) ? '.exe' : ''
    # Assume the binary was downloaded into the gem's bin/ directory via snerdmq-install
    @binary_path = File.expand_path("../../bin/snerdmq#{ext}", __dir__)
  end

  unless File.exist?(@binary_path)
    raise "[Snerd] Binary not found at #{@binary_path}. Ensure it is compiled or run 'snerdmq-install'."
  end

  @handlers = {}
  @max_retry_handlers = {}
  @handlers_mutex = Mutex.new
  
  @stdin_mutex = Mutex.new
  @shutting_down = false
  @io = nil
  @listener_thread = nil
  @pending_enqueues = {}
  @pending_mutex = Mutex.new
  @ws_clients = []
  @ws_mutex = Mutex.new
end

Instance Method Details

#enqueue(task_id:, task_type:, data:, max_retries: 3, retry_after_hours: 0.0, rate_limit_group: nil, max_per_minute: nil, auto_dedupe: false, urgency_score: nil, execute_at: nil, cron: nil, webhook_url: nil, max_execution_seconds: nil, trigger_after_ids: nil, pool: nil) ⇒ Object 



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# File 'lib/snerdmq/queue.rb', line 83

def enqueue(task_id:, task_type:, data:, max_retries: 3, retry_after_hours: 0.0, rate_limit_group: nil, max_per_minute: nil, auto_dedupe: false, urgency_score: nil, execute_at: nil, cron: nil, webhook_url: nil, max_execution_seconds: nil, trigger_after_ids: nil, pool: nil)
  raise "[Snerd] Cannot enqueue task: Queue is not running. Call start_listening first." if @io.nil? || @shutting_down
  
  payload = {
    action: "enqueue",
    task_id: task_id,
    task_type: task_type,
    task_data: data.to_json,
    max_retries: max_retries,
    retry_after_hours: retry_after_hours
  }

  payload[:rate_limit_group] = rate_limit_group if rate_limit_group
  payload[:max_per_minute] = max_per_minute if max_per_minute
  payload[:auto_dedupe] = auto_dedupe if auto_dedupe
  payload[:urgency_score] = urgency_score if urgency_score
  
  if execute_at
    payload[:execute_at] = execute_at.respond_to?(:iso8601) ? execute_at.iso8601 : execute_at.to_s
  end
  payload[:cron] = cron if cron
  payload[:webhook_url] = webhook_url if webhook_url
  payload[:max_execution_seconds] = max_execution_seconds if max_execution_seconds
  payload[:trigger_after_ids] = trigger_after_ids if trigger_after_ids
  payload[:pool] = pool if pool

  cond = ConditionVariable.new
  result = nil
  
  @pending_mutex.synchronize do
    @pending_enqueues[task_id] = { cond: cond, result: nil }
  end

  send_message(payload)

  @pending_mutex.synchronize do
    # Wait up to 5 seconds for Ack
    cond.wait(@pending_mutex, 5.0) if @pending_enqueues[task_id][:result].nil?
    pending = @pending_enqueues.delete(task_id)
    result = pending[:result] if pending
  end

  if result.nil?
    raise "[Snerd] Timeout waiting for daemon Ack on task #{task_id}"
  elsif result.is_a?(StandardError)
    raise result
  end
  
  true
end

#handle_execute(msg) ⇒ Object 



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# File 'lib/snerdmq/queue.rb', line 216

def handle_execute(msg)
  task_id = msg["task_id"]
  task_type = msg["task_type"]
  max_execution_seconds = msg["max_execution_seconds"]
  
  raw_data = msg["task_data"]
  task_data = raw_data.is_a?(String) ? JSON.parse(raw_data) : raw_data

  handler = nil
  @handlers_mutex.synchronize do
    handler = @handlers[task_type]
  end

  unless handler
    send_message({
      action: "result",
      task_id: task_id,
      status: "error",
      error_msg: "No handler registered."
    })
    return
  end

  begin
    Thread.current[:snerd_task_id] = task_id
    if max_execution_seconds
      Timeout.timeout(max_execution_seconds) do
        handler.call(task_data)
      end
    else
      handler.call(task_data)
    end
    send_message({
      action: "result",
      task_id: task_id,
      status: "success"
    })
  rescue Timeout::Error
    send_message({
      action: "result",
      task_id: task_id,
      status: "error",
      error_msg: "Task execution timed out after #{max_execution_seconds} seconds"
    })
  rescue => e
    send_message({
      action: "result",
      task_id: task_id,
      status: "error",
      error_msg: e.message
    })
  end
end

#listen_to_stdout ⇒ Object 



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# File 'lib/snerdmq/queue.rb', line 146

def listen_to_stdout
  @io.each_line do |line|
    next if line.strip.empty?

    begin
      msg = JSON.parse(line)
       
      
      if msg["action"] == "execute"
        # Execute in a short-lived thread so we don't block the stdout listener loop
        Thread.new { handle_execute(msg) }
      elsif msg["action"] == "ack"
        if msg["task_id"]
          @pending_mutex.synchronize do
            if pending = @pending_enqueues[msg["task_id"]]
              pending[:result] = true
              pending[:cond].signal
            end
          end
        end
      elsif msg["action"] == "error"
        if msg["task_id"]
          @pending_mutex.synchronize do
            if pending = @pending_enqueues[msg["task_id"]]
              pending[:result] = StandardError.new(msg["message"])
              pending[:cond].signal
            end
          end
        else
          warn "[Snerd] Error from engine: #{msg['message']}"
        end
      elsif msg["action"] == "progress"
        # Persist progress events so the dashboard (which falls back to
        # HTTP polling in Ruby) can display them in the Progress Stream.
        append_progress_event(msg)
        @ws_mutex.synchronize do
          @ws_clients.each do |ws|
            ws.send(msg.to_json)
          end
        end
      elsif msg["action"] == "max_retries_reached"
        task_type = msg["task_type"]
        handler = nil
        @handlers_mutex.synchronize do
          handler = @max_retry_handlers[task_type]
        end

        if handler
          Thread.new do
            begin
              raw_data = msg["task_data"]
              task_data = raw_data.is_a?(String) ? JSON.parse(raw_data) : raw_data
              Thread.current[:snerd_task_id] = msg["task_id"]
              handler.call(task_data)
            rescue => e
              warn "[Snerd] Error in max retry handler for task #{msg['task_id']}: #{e.message}"
            end
          end
        else
          warn "[Snerd] Dead Letter Queue: Task #{msg['task_id']} (#{msg['task_type']}) permanently failed."
        end
      end
    rescue JSON::ParserError
      # Ignore malformed stdout lines
    end
  end
rescue IOError, Errno::EPIPE
  # Normal when shutting down
end

#register_handler(task_type, &block) ⇒ Object 



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# File 'lib/snerdmq/queue.rb', line 38

def register_handler(task_type, &block)
  @handlers_mutex.synchronize do
    @handlers[task_type] = block
  end

  if @io && !@shutting_down
    send_message({
      action: "register",
      task_type: task_type
    })
  end
end

#register_max_retry_handler(task_type, &block) ⇒ Object 



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# File 'lib/snerdmq/queue.rb', line 51

def register_max_retry_handler(task_type, &block)
  @handlers_mutex.synchronize do
    @max_retry_handlers[task_type] = block
  end
end

#shutdown ⇒ Object 



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# File 'lib/snerdmq/queue.rb', line 134

def shutdown
  @shutting_down = true
  begin
    Process.kill("TERM", @io.pid) if @io && @io.pid
  rescue Errno::ESRCH, Errno::ECHILD
    # Process already dead
  end
  
  @listener_thread.join(2) if @listener_thread
  @io.close if @io && !@io.closed?
end

#start_dashboard(port: 8080) ⇒ Object 



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# File 'lib/snerdmq/queue.rb', line 276

def start_dashboard(port: 8080)
  require 'rack'
  require 'puma'
  require 'faye/websocket'
  require 'json'
  
  app = lambda do |env|
    if Faye::WebSocket.websocket?(env)
      ws = Faye::WebSocket.new(env)
      @ws_mutex.synchronize { @ws_clients << ws }
      ws.on(:close) do |event|
        @ws_mutex.synchronize { @ws_clients.delete(ws) }
      end
      return ws.rack_response
    end

    req = Rack::Request.new(env)
    cors_headers = {
      'Access-Control-Allow-Origin' => '*',
      'Access-Control-Allow-Methods' => 'GET, POST, OPTIONS'
    }

    if req.options?
      return [204, cors_headers, []]
    end

    if req.get? && req.path == '/'
      html_path = File.expand_path("../../static/index.html", __dir__)
      if File.exist?(html_path)
        return [200, { 'Content-Type' => 'text/html' }, [File.read(html_path)]]
      else
        return [404, {}, ['Dashboard UI not found']]
      end
    elsif req.get? && req.path == '/api/progress'
      events = []
      progress_path = File.join(@storage_path || './.snerdata', 'progress_events.log')
      if File.exist?(progress_path)
        File.readlines(progress_path).last(100).each do |line|
          begin
            ev = JSON.parse(line)
            events << ev if ev.is_a?(Hash) && ev['ts']
          rescue
          end
        end
      end
      return [200, { 'Content-Type' => 'application/json' }.merge(cors_headers), [events.to_json]]
    elsif req.get? && req.path == '/api/stats'
      stats = { enqueued: 0, processed: 0, failed: 0 }
      tasks_map = {}
      tasks_path = File.join(@storage_path || './.snerdata', 'tasks', 'tasks.log')
      if File.exist?(tasks_path)
        File.readlines(tasks_path).each do |line|
          next if line.strip.empty?
          begin
            t = JSON.parse(line)
            tasks_map[t['taskId']] = t if t['taskId']
          rescue
          end
        end
      end
      tasks_map.values.each do |t|
        stats[:enqueued] += 1
        if t['deletedAt']
          if t['LastJobError']
            stats[:failed] += 1
          else
            stats[:processed] += 1
          end
        end
      end
      return [200, { 'Content-Type' => 'application/json' }.merge(cors_headers), [stats.to_json]]
    elsif req.get? && req.path == '/api/tasks'
      tasks_map = {}
      tasks_path = File.join(@storage_path || './.snerdata', 'tasks', 'tasks.log')
      if File.exist?(tasks_path)
        File.readlines(tasks_path).each do |line|
          next if line.strip.empty?
          begin
            t = JSON.parse(line)
            tasks_map[t['taskId']] = t
          rescue
          end
        end
      end
      
      formatted = []
      tasks_map.values.each do |t|
        if t['deletedAt']
          if t['LastJobError'] && (t['retryCount'] || 0) >= (t['maxRetries'] || 3)
            status = 'dead_letter'
          elsif t['LastJobError']
            status = 'failed'
          else
            status = 'completed'
          end
        elsif t['LastJobError']
          status = 'failed'
        else
          status = 'queued'
          if t['executeAt']
            begin
              status = 'active' if Time.parse(t['executeAt']) <= Time.now
            rescue
            end
          end
        end
        formatted << {
          id: t['taskId'],
          type: t['taskType'],
          status: status,
          progress: 0,
          retryCount: t['retryCount'] || 0,
          maxRetries: t['maxRetries'] || 3,
          retryAfterTime: t['retryAfterTime'],
          cronExpression: t['cronExpression'],
          webhookUrl: t['webhookUrl'],
          maxExecutionSeconds: t['maxExecutionSeconds']
        }
      end
      return [200, { 'Content-Type' => 'application/json' }.merge(cors_headers), [formatted.first(50).to_json]]
    end

    [404, {}, []]
  end

  Thread.new do
    puts "[Snerd] Dashboard running on http://localhost:#{port}"
    server = Puma::Server.new(app)
    server.add_tcp_listener('0.0.0.0', port)
    server.run
  end
end

#start_listening ⇒ Object 



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# File 'lib/snerdmq/queue.rb', line 57

def start_listening
  args = []
  args << @storage_path if @storage_path

  env = {}
  env["SNERD_MAX_SHARDS"] = @max_local_shards.to_s if @max_local_shards
  env["SNERD_MAX_WORKERS"] = @max_workers.to_s if @max_workers

  # Open a bidirectional pipe to the Rust daemon
  @io = IO.popen(env, [@binary_path] + args, "r+")

  # Re-register all existing handlers
  @handlers_mutex.synchronize do
    @handlers.keys.each do |task_type|
      send_message({
        action: "register",
        task_type: task_type
      })
    end
  end

  @listener_thread = Thread.new do
    listen_to_stdout
  end
end

#yield_progress(data) ⇒ Object 



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# File 'lib/snerdmq/queue.rb', line 270

def yield_progress(data)
  task_id = Thread.current[:snerd_task_id]
  raise "[Snerd] yield_progress must be called within a task handler context." unless task_id
  send_message({ action: "progress", task_id: task_id, data: data })
end