Class: Streamdal::Client

Inherits:
Object
  • Object
show all
Includes:
Audiences, Schemas, Validation
Defined in:
lib/streamdal.rb

Constant Summary collapse

CounterEntry =

Aliases to keep lines short

Streamdal::Metrics::CounterEntry
Metrics = 
Streamdal::Metrics

Instance Method Summary collapse

Methods included from Schemas

#_get_schema, #_handle_schema, #_set_schema

Methods included from Validation

#validate_kv_command, #validate_kv_instruction, #validate_kv_object, #validate_set_pipelines, #validate_tail_request

Methods included from Audiences

#_add_audience, #_add_audiences, #_seen_audience, #aud_to_str, #str_to_aud

Constructor Details

#initialize(cfg) ⇒ Client

Returns a new instance of Client.



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# File 'lib/streamdal.rb', line 84

def initialize(cfg)
  _validate_cfg(cfg)

  @cfg = cfg
  @log = cfg[:log]
  @functions = {}
  @session_id = SecureRandom.uuid
  @pipelines = {}
  @audiences = {}
  @schemas = {}
  @tails = {}
  @paused_tails = {}
  @metrics = Metrics.new(cfg)
  @workers = []
  @exit = false
  @kv = Streamdal::KeyValue.new
  @hostfunc = Streamdal::HostFunc.new(@kv)

  # # Connect to Streamdal External gRPC API
  @stub = Streamdal::Protos::Internal::Stub.new(@cfg[:streamdal_url], :this_channel_is_insecure)

  _pull_initial_pipelines

  @workers << Thread.new { _heartbeat }
  @workers << Thread.new { _register }
end

Instance Method Details

#process(data, audience) ⇒ Object 



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# File 'lib/streamdal.rb', line 126

def process(data, audience)
  if data.empty?
    raise 'data is required'
  end

  if audience.nil?
    raise 'audience is required'
  end

  resp = Streamdal::Protos::SDKResponse.new
  resp.status = :EXEC_STATUS_TRUE
  resp.pipeline_status = Google::Protobuf::RepeatedField.new(:message, Streamdal::Protos::PipelineStatus, [])
  resp.data = data

  aud = audience.to_proto(@cfg[:service_name])

  labels = {
    "service": @cfg[:service_name],
    "operation_type": aud.operation_type,
    "operation": aud.operation_name,
    "component": aud.component_name,
    "pipeline_name": '',
    "pipeline_id": '',
  }

  # TODO: metrics
  bytes_processed = Metrics::COUNTER_CONSUME_BYTES
  errors_counter = Metrics::COUNTER_CONSUME_ERRORS
  total_counter = Metrics::COUNTER_CONSUME_PROCESSED
  rate_processed = Metrics::COUNTER_CONSUME_PROCESSED_RATE

  if aud.operation_type == OPERATION_TYPE_PRODUCER
    bytes_processed = Metrics::COUNTER_PRODUCE_BYTES
    errors_counter = Metrics::COUNTER_PRODUCE_ERRORS
    total_counter = Metrics::COUNTER_PRODUCE_PROCESSED
    rate_processed = Metrics::COUNTER_PRODUCE_PROCESSED_RATE
  end

  payload_size = data.length

  if payload_size > MAX_PAYLOAD_SIZE
    # TODO: add metrics
    resp.status = :EXEC_STATUS_ERROR
    resp.error = 'payload size exceeds maximum allowed size'
    resp
  end

  # Needed for send_tail()
  original_data = data

  pipelines = _get_pipelines(aud)
  if pipelines.empty?
    _send_tail(aud, '', original_data, original_data)
    return resp
  end

  @metrics.incr(CounterEntry.new(bytes_processed, aud, labels, data.length))
  @metrics.incr(CounterEntry.new(rate_processed, aud, labels, 1))

  # Used for passing data between steps
  isr = nil

  Timeout::timeout(@cfg[:pipeline_timeout]) do
    pipelines.each do |pipeline|
      pipeline_status = Streamdal::Protos::PipelineStatus.new
      pipeline_status.id = pipeline.id
      pipeline_status.name = pipeline.name
      pipeline_status.step_status = Google::Protobuf::RepeatedField.new(:message, Streamdal::Protos::StepStatus, [])

      @log.debug "Running pipeline: '#{pipeline.name}'"

      labels[:pipeline_id] = pipeline.id
      labels[:pipeline_name] = pipeline.name

      @metrics.incr(CounterEntry.new(total_counter, aud, labels, 1))
      @metrics.incr(CounterEntry.new(bytes_processed, aud, labels, data.length))

      pipeline.steps.each do |step|
        step_status = Streamdal::Protos::StepStatus.new
        step_status.name = step.name
        step_status.status = :EXEC_STATUS_TRUE

        begin
          wasm_resp = _call_wasm(step, data, isr)
        rescue => e
          @log.error "Error running step '#{step.name}': #{e}"
          step_status.status = :EXEC_STATUS_ERROR
          step_status.error = e.to_s
          pipeline_status.step_status.push(step_status)
          break
        end

        if @cfg[:dry_run]
          @log.debug "Running step '#{step.name}' in dry-run mode"
        end

        if wasm_resp.output_payload.length.positive?
          resp.data = wasm_resp.output_payload
        end

        _handle_schema(aud, step, wasm_resp)

        isr = wasm_resp.inter_step_result

        case wasm_resp.exit_code
        when :WASM_EXIT_CODE_FALSE
          cond = step.on_false
          cond_type = :CONDITION_TYPE_ON_FALSE
          exec_status = :EXEC_STATUS_FALSE
        when :WASM_EXIT_CODE_ERROR
          cond = step.on_error
          cond_type = :CONDITION_TYPE_ON_ERROR
          exec_status = :EXEC_STATUS_ERROR
          isr = nil

          # errors_counter, 1, labels, aud
          @metrics.incr(CounterEntry.new(errors_counter, aud, labels, 1))
        else
          cond = step.on_true
          exec_status = :EXEC_STATUS_TRUE
          cond_type = :CONDITION_TYPE_ON_TRUE
        end

        _notify_condition(pipeline, step, aud, cond, resp.data, cond_type)

        if @cfg[:dry_run]
          @log.debug("Step '#{step.name}' completed with status: #{exec_status}, continuing to next step")
          next
        end

        # Whether we are aborting early, aborting current, or continuing, we need to set the step status
        step_status.status = exec_status
        step_status.status_message = "Step returned: #{wasm_resp.exit_msg}"

        # Pull metadata from step into SDKResponse
        unless cond.nil?
          resp.metadata = cond.metadata

          case cond.abort
          when :ABORT_CONDITION_ABORT_CURRENT
            step_status.status = exec_status
            step_status.status_message = "Step returned: #{wasm_resp.exit_msg}"
            pipeline_status.step_status.push(step_status)
            resp.pipeline_status.push(pipeline_status)
            # Continue outer pipeline loop, there might be additional pipelines
            break
          when :ABORT_CONDITION_ABORT_ALL
            # Set step status and push to pipeline status
            step_status.status = exec_status
            step_status.status_message = "Step returned: #{wasm_resp.exit_msg}"
            pipeline_status.step_status.push(step_status)
            resp.pipeline_status.push(pipeline_status)

            # Since we're returning early here, also need to set the response status
            resp.status = exec_status
            resp.status_message = "Step returned: #{wasm_resp.exit_msg}"

            _send_tail(aud, pipeline.id, original_data, resp.data)
            return resp
          else
            # Do nothing
          end
        end

        # Append step status to the current pipeline status' array
        pipeline_status.step_status.push(step_status)
      end

      # Append pipeline status to the response
      resp.pipeline_status.push(pipeline_status)
    end # pipelines.each
  end # timeout

  _send_tail(aud, '', original_data, resp.data)

  if @cfg[:dry_run]
    @log.debug 'Dry-run, setting response data to original data'
    resp.data = original_data
  end

  resp
end

#shutdown ⇒ Object 



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# File 'lib/streamdal.rb', line 111

def shutdown
  # Set exit flag so workers exit
  @exit = true

  # Let loops exit
  sleep(1)

  # Exit any remaining threads
  @workers.each do |w|
    if w.running?
      w.exit
    end
  end
end