Class: Pgbus::Web::DataSource

Inherits:
Object
  • Object
show all
Defined in:
lib/pgbus/web/data_source.rb

Instance Method Summary collapse

Constructor Details

#initialize(client: Pgbus.client) ⇒ DataSource

Returns a new instance of DataSource.



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# File 'lib/pgbus/web/data_source.rb', line 8

def initialize(client: Pgbus.client)
  @client = client
  @last_throughput_snapshot = nil
  @last_throughput_at = nil
end

Instance Method Details

#active_batches_count ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 657

def active_batches_count
  BatchEntry.where.not(status: "finished").count
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error counting active batches: #{e.message}" }
  0
end

#batch_detail(batch_id) ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 635

def batch_detail(batch_id)
  record = BatchEntry.find_by(batch_id: batch_id)
  return nil unless record

  format_batch(record).merge(
    properties: record.properties,
    on_finish_class: record.on_finish_class,
    on_success_class: record.on_success_class,
    on_discard_class: record.on_discard_class
  )
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error fetching batch #{batch_id}: #{e.message}" }
  nil
end

#batches(limit: 100) ⇒ Object

Batches



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# File 'lib/pgbus/web/data_source.rb', line 628

def batches(limit: 100)
  BatchEntry.order(created_at: :desc).limit(limit).map { |r| format_batch(r) }
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error fetching batches: #{e.message}" }
  []
end

#batches_count ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 650

def batches_count
  BatchEntry.count
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error counting batches: #{e.message}" }
  0
end

#discard_all_dlq ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 374

def discard_all_dlq
  messages = dlq_messages(page: 1, per_page: 1000)
  return 0 if messages.empty?

  release_locks_for_messages(messages)

  # Group by queue for batch delete — one call per DLQ instead of N calls
  messages.group_by { |m| m[:queue_name] }.sum do |queue_name, msgs|
    ids = msgs.map { |m| m[:msg_id].to_i }
    @client.delete_batch(queue_name, ids, prefixed: false).size
  rescue StandardError => e
    Pgbus.logger.debug { "[Pgbus::Web] Error batch-discarding DLQ messages from #{queue_name}: #{e.message}" }
    0
  end
end

#discard_all_enqueued ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 153

def discard_all_enqueued
  dlq_suffix = Pgbus::DEAD_LETTER_SUFFIX
  queues = queues_with_metrics.reject { |q| q[:name].end_with?(dlq_suffix) }
  total = 0

  queues.each do |q|
    messages = query_queue_messages_raw(q[:name], 10_000, 0)
    next if messages.empty?

    release_locks_for_messages(messages)

    ids = messages.map { |m| m[:msg_id].to_i }
    @client.archive_batch(q[:name], ids, prefixed: false)
    total += ids.size
  rescue StandardError => e
    Pgbus.logger.debug { "[Pgbus::Web] Error discarding enqueued messages from #{q[:name]}: #{e.message}" }
  end

  total
end

#discard_all_failed ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 278

def discard_all_failed
  release_locks_for_failed_events
  archive_all_failed_messages

  result = connection.execute("DELETE FROM pgbus_failed_events")
  result.cmd_tuples
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error discarding all failed events: #{e.message}" }
  0
end

#discard_all_locks ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 604

def discard_all_locks
  UniquenessKey.delete_all
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error discarding all locks: #{e.message}" }
  0
end

#discard_dlq_message(queue_name, msg_id) ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 352

def discard_dlq_message(queue_name, msg_id)
  # queue_name here is the full DLQ name (already prefixed)
  release_lock_for_message(queue_name, msg_id)
  @client.delete_message(queue_name, msg_id.to_i, prefixed: false)
  true
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error discarding DLQ message #{msg_id}: #{e.message}" }
  false
end

#discard_event(queue_name, msg_id) ⇒ Object

Discard (archive) an event message from a handler queue.



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# File 'lib/pgbus/web/data_source.rb', line 832

def discard_event(queue_name, msg_id)
  release_lock_for_message(queue_name, msg_id)
  @client.archive_message(queue_name, msg_id.to_i, prefixed: false)
  true
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error discarding event #{msg_id}: #{e.message}" }
  false
end

#discard_failed_event(id) ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 235

def discard_failed_event(id)
  event = failed_event(id)
  if event
    release_lock_for_payload(event["payload"])
    archive_failed_message(event)
  end

  connection.exec_delete(
    "DELETE FROM pgbus_failed_events WHERE id = $1", "Pgbus Delete Failed Event", [id.to_i]
  )
  true
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error discarding failed event #{id}: #{e.message}" }
  false
end

#discard_job(queue_name, msg_id) ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 148

def discard_job(queue_name, msg_id)
  release_lock_for_message(queue_name, msg_id)
  @client.archive_message(queue_name, msg_id.to_i, prefixed: false)
end

#discard_lock(lock_key) ⇒ Object

Lock management



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# File 'lib/pgbus/web/data_source.rb', line 588

def discard_lock(lock_key)
  UniquenessKey.where(lock_key: lock_key).delete_all
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error discarding lock #{lock_key}: #{e.message}" }
  0
end

#discard_locks(lock_keys) ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 595

def discard_locks(lock_keys)
  return 0 if lock_keys.empty?

  UniquenessKey.where(lock_key: lock_keys).delete_all
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error discarding locks: #{e.message}" }
  0
end

#discard_selected_events(selections) ⇒ Object

Bulk discard selected events from handler queues.



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# File 'lib/pgbus/web/data_source.rb', line 916

def discard_selected_events(selections)
  return 0 if selections.empty?

  count = 0
  selections.each do |sel|
    discard_event(sel[:queue_name], sel[:msg_id]) && count += 1
  rescue StandardError => e
    Pgbus.logger.debug { "[Pgbus::Web] Error in bulk discard for #{sel[:msg_id]}: #{e.message}" }
    next
  end
  count
end

#dlq_message_detail(msg_id) ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 313

def dlq_message_detail(msg_id)
  dlq_suffix = Pgbus::DEAD_LETTER_SUFFIX
  queues = queues_with_metrics.select { |q| q[:name].end_with?(dlq_suffix) }
  queues.each do |q|
    row = connection.select_one(
      "SELECT * FROM pgmq.q_#{sanitize_name(q[:name])} WHERE msg_id = $1",
      "Pgbus DLQ Detail",
      [msg_id.to_i]
    )
    return format_message(row, q[:name]) if row
  end
  nil
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error fetching DLQ message #{msg_id}: #{e.message}" }
  nil
end

#dlq_messages(page: 1, per_page: 25) ⇒ Object

Dead letter queue Note: DLQ queue names from queues_with_metrics are already fully qualified (e.g., "pgbus_default_dlq"), so we use them directly without re-prefixing.



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# File 'lib/pgbus/web/data_source.rb', line 292

def dlq_messages(page: 1, per_page: 25)
  dlq_suffix = Pgbus::DEAD_LETTER_SUFFIX
  queues = queues_with_metrics.select { |q| q[:name].end_with?(dlq_suffix) }
  offset = (page - 1) * per_page

  paginated_queue_messages(queues.map { |q| q[:name] }, per_page, offset)
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error fetching DLQ messages: #{e.message}" }
  []
end

#dlq_total_count ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 303

def dlq_total_count
  dlq_suffix = Pgbus::DEAD_LETTER_SUFFIX
  queues_with_metrics
    .select { |q| q[:name].end_with?(dlq_suffix) }
    .sum { |q| q[:queue_length] }
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error fetching DLQ count: #{e.message}" }
  0
end

#drop_queue(name) ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 95

def drop_queue(name)
  release_uniqueness_keys_for_queue(name)
  @client.drop_queue(name, prefixed: false)
end

#edit_event_payload(queue_name, msg_id, new_payload_json) ⇒ Object

Edit the payload of a stuck event: delete old message and re-enqueue with the corrected payload in the same queue. The produce + delete are wrapped in a PGMQ transaction so the message can't be lost if either half fails (same pattern as retry_dlq_message).



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# File 'lib/pgbus/web/data_source.rb', line 878

def edit_event_payload(queue_name, msg_id, new_payload_json)
  begin
    parsed = JSON.parse(new_payload_json)
  rescue JSON::ParserError
    return false
  end

  detail = job_detail(queue_name, msg_id)
  return false unless detail

  @client.transaction do |txn|
    txn.produce(queue_name, parsed.to_json, headers: detail[:headers])
    txn.delete(queue_name, msg_id.to_i)
  end
  true
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error editing event #{msg_id}: #{e.message}" }
  false
end

#enqueue_recurring_task_now(id) ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 540

def enqueue_recurring_task_now(id)
  record = RecurringTask.find_by(id: id)
  return false unless record

  task = Recurring::Task.from_configuration(record.key,
                                            class: record.class_name,
                                            command: record.command,
                                            schedule: record.schedule,
                                            queue: record.queue_name,
                                            args: parse_arguments(record.arguments),
                                            priority: record.priority)

  schedule = Recurring::Schedule.new(config: Pgbus.configuration)
  schedule.enqueue_task(task, run_at: Time.now.utc)
  true
rescue StandardError => e
  Pgbus.logger.error { "[Pgbus::Web] Error enqueuing recurring task #{id}: #{e.message}" }
  false
end

#failed_event(id) ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 196

def failed_event(id)
  connection.select_one(
    "SELECT * FROM pgbus_failed_events WHERE id = $1",
    "Pgbus Failed Event",
    [id.to_i]
  )
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error fetching failed event #{id}: #{e.message}" }
  nil
end

#failed_events(page: 1, per_page: 25) ⇒ Object

Failed events



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# File 'lib/pgbus/web/data_source.rb', line 175

def failed_events(page: 1, per_page: 25)
  offset = (page - 1) * per_page
  rows = connection.select_all(
    "SELECT * FROM pgbus_failed_events ORDER BY failed_at DESC LIMIT $1 OFFSET $2",
    "Pgbus Failed Events",
    [per_page, offset]
  )
  rows.to_a
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error fetching failed events: #{e.message}" }
  []
end

#failed_events_count ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 188

def failed_events_count
  result = connection.select_value("SELECT COUNT(*) FROM pgbus_failed_events")
  result.to_i
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error counting failed events: #{e.message}" }
  0
end

#handler_class_for_queue(physical_queue_name) ⇒ Object

Find the handler class registered for a given physical queue name. Returns nil if no subscriber matches — used to reject forged handler values in mark_event_handled / reroute_event.



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# File 'lib/pgbus/web/data_source.rb', line 826

def handler_class_for_queue(physical_queue_name)
  sub = registered_subscribers.find { |s| s[:physical_queue_name] == physical_queue_name }
  sub && sub[:handler_class]
end

#handler_queue_physical_names ⇒ Object

Physical queue names for all registered subscribers. Used for both pending_events lookup and server-side validation of target queues in reroute_event.



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# File 'lib/pgbus/web/data_source.rb', line 819

def handler_queue_physical_names
  registered_subscribers.map { |s| s[:physical_queue_name] }.uniq
end

#job_detail(queue_name, msg_id) ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 132

def job_detail(queue_name, msg_id)
  row = connection.select_one(
    "SELECT * FROM pgmq.q_#{sanitize_name(queue_name)} WHERE msg_id = $1",
    "Pgbus Job Detail",
    [msg_id.to_i]
  )
  row ? format_message(row, queue_name) : nil
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error fetching job detail: #{e.message}" }
  nil
end

#job_locks ⇒ Object

Job uniqueness keys



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# File 'lib/pgbus/web/data_source.rb', line 612

def job_locks
  UniquenessKey.order(created_at: :desc).limit(100).map do |key|
    {
      lock_key: key.lock_key,
      queue_name: key.queue_name,
      msg_id: key.msg_id,
      created_at: key.created_at,
      age_seconds: key.created_at ? (Time.current - key.created_at).to_i : nil
    }
  end
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error fetching uniqueness keys: #{e.message}" }
  []
end

#job_stats_summary(minutes: 60) ⇒ Object

Job stats



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# File 'lib/pgbus/web/data_source.rb', line 665

def job_stats_summary(minutes: 60)
  JobStat.summary(minutes: minutes)
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error fetching job stats summary: #{e.message}" }
  { total: 0, success: 0, failed: 0, dead_lettered: 0, avg_duration_ms: 0, max_duration_ms: 0 }
end

#job_status_counts(minutes: 60) ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 679

def job_status_counts(minutes: 60)
  JobStat.status_counts(minutes: minutes)
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error fetching status counts: #{e.message}" }
  {}
end

#job_throughput(minutes: 60) ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 672

def job_throughput(minutes: 60)
  JobStat.throughput(minutes: minutes).map { |time, count| { time: time, count: count } }
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error fetching throughput: #{e.message}" }
  []
end

#jobs(queue_name: nil, page: 1, per_page: 25) ⇒ Object

Jobs (messages in queue tables)



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# File 'lib/pgbus/web/data_source.rb', line 119

def jobs(queue_name: nil, page: 1, per_page: 25)
  offset = (page - 1) * per_page

  if queue_name
    query_queue_messages(queue_name, per_page, offset)
  else
    all_queue_messages(per_page, offset)
  end
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error reading jobs: #{e.message}" }
  []
end

#latency_by_queue(minutes: 60) ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 700

def latency_by_queue(minutes: 60)
  JobStat.avg_latency_by_queue(minutes: minutes)
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error fetching latency by queue: #{e.message}" }
  []
end

#latency_trend(minutes: 60) ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 693

def latency_trend(minutes: 60)
  JobStat.latency_trend(minutes: minutes)
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error fetching latency trend: #{e.message}" }
  []
end

#live_stream_metrics ⇒ Object

Stream stats — only populated when streams_stats_enabled is true AND the migration has been run. Controllers should gate rendering on stream_stats_available? to avoid showing empty sections.



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# File 'lib/pgbus/web/data_source.rb', line 755

def live_stream_metrics
  counter = Pgbus::Web::Streamer.stream_counter
  unless counter
    empty_totals = { broadcasts: 0, active_connections: 0, total_connections: 0, streams: 0 }
    return { streams: {}, totals: empty_totals }
  end

  { streams: counter.snapshot, totals: counter.totals }
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error fetching live stream metrics: #{e.message}" }
  { streams: {}, totals: { broadcasts: 0, active_connections: 0, total_connections: 0, streams: 0 } }
end

#mark_event_handled(queue_name, msg_id, handler_class) ⇒ Object

Mark an event as handled: archive the queue message and insert a ProcessedEvent record so it won't be reprocessed on replay.

The insert is performed BEFORE archive. If the archive step fails afterwards the operator can retry — replay protection is already in place and the idempotency dedup will cause the handler to skip the event even if it is eventually re-read from the queue. Doing it the other way around would risk losing the message without recording the marker.



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# File 'lib/pgbus/web/data_source.rb', line 850

def mark_event_handled(queue_name, msg_id, handler_class)
  detail = job_detail(queue_name, msg_id)
  return false unless detail

  raw = JSON.parse(detail[:message])
  event_id = raw["event_id"]
  return false unless event_id

  ProcessedEvent.insert(
    { event_id: event_id, handler_class: handler_class, processed_at: Time.now.utc },
    unique_by: %i[event_id handler_class]
  )
  # Release the uniqueness lock while we still hold the payload in
  # memory — otherwise the message is archived but the lock row stays
  # behind, blocking later publishes with the same key. Mirrors
  # discard_event.
  release_lock_for_payload(detail[:message])
  @client.archive_message(queue_name, msg_id.to_i, prefixed: false)
  true
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error marking event #{msg_id} handled: #{e.message}" }
  false
end

#notify_throttles ⇒ Object

NOTIFY throttle status for all queues with notifications enabled. Returns an array of hashes: { queue_name:, throttle_interval_ms:, last_notified_at: }



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# File 'lib/pgbus/web/data_source.rb', line 950

def notify_throttles
  @client.list_notify_insert_throttles.map do |throttle|
    {
      queue_name: throttle.queue_name,
      throttle_interval_ms: throttle.throttle_interval_ms,
      last_notified_at: throttle.last_notified_at
    }
  end
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error fetching notify throttles: #{e.message}" }
  []
end

#outbox_entries(page: 1, per_page: 25) ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 579

def outbox_entries(page: 1, per_page: 25)
  offset = (page - 1) * per_page
  OutboxEntry.order(id: :desc).limit(per_page).offset(offset).to_a
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error fetching outbox entries: #{e.message}" }
  []
end

#outbox_stats ⇒ Object

Outbox



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# File 'lib/pgbus/web/data_source.rb', line 568

def outbox_stats
  {
    unpublished: OutboxEntry.unpublished.count,
    total: OutboxEntry.count,
    oldest_unpublished_age: oldest_unpublished_age
  }
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error fetching outbox stats: #{e.message}" }
  { unpublished: 0, total: 0, oldest_unpublished_age: nil }
end

#pause_queue(name, reason: nil) ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 100

def pause_queue(name, reason: nil)
  QueueState.pause!(logical_queue_name(name), reason: reason)
rescue StandardError => e
  Pgbus.logger.error { "[Pgbus::Web] Error pausing queue #{name}: #{e.message}" }
end

#pending_events(page: 1, per_page: 25) ⇒ Object

Pending events — messages sitting in handler queues that haven't been processed. Identifies handler queues via the subscriber registry and queries them for unprocessed messages. Subscriber queue names are logical (e.g. "task_completion_handler"), while pgmq.meta.queue_name stores physical names (e.g. "pgbus_task_completion_handler"), so we normalize through config.queue_name before intersecting.



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# File 'lib/pgbus/web/data_source.rb', line 799

def pending_events(page: 1, per_page: 25)
  handler_queues = handler_queue_physical_names
  return [] if handler_queues.empty?

  existing = connection.select_values(
    "SELECT queue_name FROM pgmq.meta ORDER BY queue_name", "Pgbus Queue Names"
  )
  target_queues = handler_queues & existing
  return [] if target_queues.empty?

  offset = (page - 1) * per_page
  paginated_queue_messages(target_queues, per_page, offset)
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error fetching pending events: #{e.message}" }
  []
end

#processed_event(id) ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 415

def processed_event(id)
  connection.select_one(
    "SELECT * FROM pgbus_processed_events WHERE id = $1",
    "Pgbus Processed Event",
    [id.to_i]
  )
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error fetching processed event #{id}: #{e.message}" }
  nil
end

#processed_events(page: 1, per_page: 25) ⇒ Object

Processed events (audit trail)



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# File 'lib/pgbus/web/data_source.rb', line 402

def processed_events(page: 1, per_page: 25)
  offset = (page - 1) * per_page
  rows = connection.select_all(
    "SELECT * FROM pgbus_processed_events ORDER BY processed_at DESC LIMIT $1 OFFSET $2",
    "Pgbus Processed Events",
    [per_page, offset]
  )
  rows.to_a
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error fetching processed events: #{e.message}" }
  []
end

#processed_events_count ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 426

def processed_events_count
  result = connection.select_value("SELECT COUNT(*) FROM pgbus_processed_events")
  result.to_i
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error counting processed events: #{e.message}" }
  0
end

#processes ⇒ Object

Processes



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# File 'lib/pgbus/web/data_source.rb', line 391

def processes
  rows = connection.select_all(
    "SELECT * FROM pgbus_processes ORDER BY kind, created_at"
  )
  rows.to_a.map { |r| format_process(r) }
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error fetching processes: #{e.message}" }
  []
end

#purge_queue(name) ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 90

def purge_queue(name)
  release_uniqueness_keys_for_queue(name)
  @client.purge_queue(name, prefixed: false)
end

#queue_detail(name) ⇒ Object

name is the full PGMQ queue name (e.g. "pgbus_default") as returned by queues_with_metrics. No prefix is added.



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# File 'lib/pgbus/web/data_source.rb', line 83

def queue_detail(name)
  queue_metrics_via_sql(name)
rescue StandardError => e
  Pgbus.logger.error { "[Pgbus::Web] Error fetching queue detail for #{name}: #{e.class}: #{e.message}" }
  nil
end

#queue_group_heads(queue_name, qty: 20) ⇒ Object

FIFO group head sampling for a specific queue. Returns the oldest visible message from each distinct group (up to qty). Useful for detecting head-of-line stalls in multi-tenant queues.



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# File 'lib/pgbus/web/data_source.rb', line 966

def queue_group_heads(queue_name, qty: 20)
  logical = logical_queue_name(queue_name)
  messages = @client.read_grouped_head(logical, qty: qty) || []
  messages.map { |m| format_pgmq_message(m, queue_name) }
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error fetching group heads for #{queue_name}: #{e.message}" }
  []
end

#queue_health_detail(queue_name) ⇒ Object

Per-queue health stats for the queue detail view.



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# File 'lib/pgbus/web/data_source.rb', line 738

def queue_health_detail(queue_name)
  sanitized = sanitize_name(queue_name)
  tables = [
    fetch_table_stats("pgmq", "q_#{sanitized}", "queue"),
    fetch_table_stats("pgmq", "a_#{sanitized}", "archive")
  ].compact

  { tables: tables, oldest_transaction_age_sec: oldest_transaction_age }
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error fetching health detail for #{queue_name}: #{e.message}" }
  { tables: [], oldest_transaction_age_sec: nil }
end

#queue_health_stats ⇒ Object

Queue health — vacuum stats, dead tuples, bloat, MVCC horizon. Returns aggregate health across all queue and archive tables, plus the oldest open transaction age (MVCC horizon pinning risk).



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# File 'lib/pgbus/web/data_source.rb', line 710

def queue_health_stats
  tables = fetch_all_table_stats

  total_dead = tables.sum { |t| t[:dead_tuples] }
  total_live = tables.sum { |t| t[:live_tuples] }
  worst_bloat = tables.map { |t| t[:bloat_ratio] }.max || 0.0
  needs_vacuum = tables.count { |t| t[:bloat_ratio] > 0.1 }
  oldest_vacuum = tables.filter_map { |t| t[:last_vacuum_ago_sec] }.max

  {
    total_dead_tuples: total_dead,
    total_live_tuples: total_live,
    worst_bloat_ratio: worst_bloat.round(4),
    tables_needing_vacuum: needs_vacuum,
    oldest_vacuum_ago_sec: oldest_vacuum,
    oldest_transaction_age_sec: oldest_transaction_age,
    tables: tables
  }
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error fetching queue health stats: #{e.class}: #{e.message}" }
  {
    total_dead_tuples: 0, total_live_tuples: 0, worst_bloat_ratio: 0.0,
    tables_needing_vacuum: 0, oldest_vacuum_ago_sec: nil,
    oldest_transaction_age_sec: nil, tables: []
  }
end

#queue_paused?(name) ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pgbus/web/data_source.rb', line 112

def queue_paused?(name)
  QueueState.paused?(logical_queue_name(name))
rescue StandardError
  false
end

#queues_with_metrics ⇒ Object

Queues — query via ActiveRecord for reliability in web processes (avoids PGMQ client connection issues when the web server uses a different connection lifecycle than the worker processes). Memoized for the lifetime of this data-source instance (one per web request — see ApplicationController#data_source). A single page can ask for queue metrics more than once (e.g. the DLQ page reads both the message rows and the total count); without the memo each call re-runs the meta query + batched metrics. Mutations redirect to a fresh request with a new instance, so a per-request memo never serves stale data.



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# File 'lib/pgbus/web/data_source.rb', line 50

def queues_with_metrics
  @queues_with_metrics ||= fetch_queues_with_metrics
end

#recurring_task(id) ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 489

def recurring_task(id)
  record = RecurringTask.find_by(id: id)
  return nil unless record

  task = Recurring::Task.from_configuration(record.key,
                                            class: record.class_name,
                                            command: record.command,
                                            schedule: record.schedule,
                                            queue: record.queue_name,
                                            args: parse_arguments(record.arguments),
                                            priority: record.priority,
                                            description: record.description)

  executions = RecurringExecution.for_task(record.key).recent(25).map do |exec|
    { run_at: exec.run_at, created_at: exec.created_at }
  end

  {
    id: record.id,
    key: record.key,
    class_name: record.class_name,
    command: record.command,
    schedule: record.schedule,
    human_schedule: task.human_schedule,
    queue_name: record.queue_name,
    arguments: parse_arguments(record.arguments),
    priority: record.priority,
    description: record.description,
    enabled: record.enabled,
    static: record.static,
    next_run_at: task.next_time,
    executions: executions,
    created_at: record.created_at,
    updated_at: record.updated_at
  }
rescue StandardError => e
  Pgbus.logger.error { "[Pgbus::Web] Error fetching recurring task #{id}: #{e.class}: #{e.message}" }
  nil
end

#recurring_tasks ⇒ Object

Recurring tasks



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# File 'lib/pgbus/web/data_source.rb', line 447

def recurring_tasks
  records = RecurringTask.order(:key).to_a
  last_runs = RecurringExecution
              .where(task_key: records.map(&:key))
              .select("task_key, MAX(run_at) AS run_at")
              .group(:task_key)
              .index_by(&:task_key)

  records.map do |record|
    last_exec = last_runs[record.key]
    task = Recurring::Task.from_configuration(record.key,
                                              class: record.class_name,
                                              command: record.command,
                                              schedule: record.schedule,
                                              queue: record.queue_name,
                                              args: parse_arguments(record.arguments),
                                              priority: record.priority,
                                              description: record.description)

    {
      id: record.id,
      key: record.key,
      class_name: record.class_name,
      command: record.command,
      schedule: record.schedule,
      human_schedule: task.human_schedule,
      queue_name: record.queue_name,
      priority: record.priority,
      description: record.description,
      enabled: record.enabled,
      static: record.static,
      next_run_at: task.next_time,
      last_run_at: last_exec&.run_at,
      created_at: record.created_at,
      updated_at: record.updated_at
    }
  end
rescue StandardError => e
  Pgbus.logger.error { "[Pgbus::Web] Error fetching recurring tasks: #{e.class}: #{e.message}" }
  []
end

#recurring_tasks_count ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 560

def recurring_tasks_count
  RecurringTask.count
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error counting recurring tasks: #{e.message}" }
  0
end

#registered_subscribers ⇒ Object

Subscriber registry. queue_name is the logical name the subscriber registered with; physical_queue_name is what the queue is actually called in pgmq.meta (e.g. logical "task_completion_handler" -> physical "pgbus_task_completion_handler"). The dashboard needs the physical name to match against pending messages / target queues.



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# File 'lib/pgbus/web/data_source.rb', line 934

def registered_subscribers
  EventBus::Registry.instance.subscribers.map do |s|
    {
      pattern: s.pattern,
      handler_class: s.handler_class.name,
      queue_name: s.queue_name,
      physical_queue_name: @client.config.queue_name(s.queue_name)
    }
  end
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error fetching subscribers: #{e.message}" }
  []
end

#replay_event(event) ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 434

def replay_event(event)
  # Re-publish the event payload to all matching subscribers
  routing_key = event["routing_key"] || event["handler_class"]
  return false unless routing_key

  @client.publish_to_topic(routing_key, event["payload"] || "{}")
  true
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error replaying event: #{e.message}" }
  false
end

#reroute_event(source_queue, msg_id, target_queue) ⇒ Object

Reroute an event from one handler queue to another. Wrapped in a PGMQ transaction so produce on the target and delete on the source are atomic.



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# File 'lib/pgbus/web/data_source.rb', line 901

def reroute_event(source_queue, msg_id, target_queue)
  detail = job_detail(source_queue, msg_id)
  return false unless detail

  @client.transaction do |txn|
    txn.produce(target_queue, detail[:message], headers: detail[:headers])
    txn.delete(source_queue, msg_id.to_i)
  end
  true
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error rerouting event #{msg_id}: #{e.message}" }
  false
end

#resume_queue(name) ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 106

def resume_queue(name)
  QueueState.resume!(logical_queue_name(name))
rescue StandardError => e
  Pgbus.logger.error { "[Pgbus::Web] Error resuming queue #{name}: #{e.message}" }
end

#retry_all_dlq ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 362

def retry_all_dlq
  messages = dlq_messages(page: 1, per_page: 1000)
  count = 0
  messages.each do |m|
    retry_dlq_message(m[:queue_name], m[:msg_id]) && count += 1
  rescue StandardError => e
    Pgbus.logger.debug { "[Pgbus::Web] Error retrying DLQ message #{m[:msg_id]}: #{e.message}" }
    next
  end
  count
end

#retry_all_failed ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 251

def retry_all_failed
  count = 0
  loop do
    batch = connection.select_all(
      "SELECT * FROM pgbus_failed_events ORDER BY id LIMIT 100", "Pgbus Retry Batch"
    ).to_a
    break if batch.empty?

    batch.each do |event|
      payload = JSON.parse(event["payload"])
      headers = event["headers"]
      headers = JSON.parse(headers) if headers.is_a?(String)

      connection.transaction do
        @client.send_message(event["queue_name"], payload, headers: headers)
        connection.exec_delete(
          "DELETE FROM pgbus_failed_events WHERE id = $1", "Pgbus Delete Failed Event", [event["id"].to_i]
        )
      end
      count += 1
    rescue StandardError => e
      Pgbus.logger.error { "[Pgbus::Web] Failed to retry event #{event["id"]}: #{e.message}" }
    end
  end
  count
end

#retry_dlq_message(queue_name, msg_id) ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 330

def retry_dlq_message(queue_name, msg_id)
  # queue_name here is the full DLQ name (already prefixed)
  dlq_suffix = Pgbus::DEAD_LETTER_SUFFIX
  original_queue = queue_name.delete_suffix(dlq_suffix)

  row = connection.select_one(
    "SELECT * FROM pgmq.q_#{sanitize_name(queue_name)} WHERE msg_id = $1",
    "Pgbus DLQ Read",
    [msg_id.to_i]
  )
  return false unless row

  @client.transaction do |txn|
    txn.produce(original_queue, row["message"], headers: row["headers"])
    txn.delete(queue_name, msg_id.to_i)
  end
  true
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error retrying DLQ message #{msg_id}: #{e.message}" }
  false
end

#retry_failed_event(id) ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 207

def retry_failed_event(id)
  event = failed_event(id)
  return false unless event

  # Prefer resetting the existing message's visibility timeout to 0
  # so the worker picks it up immediately. This avoids creating a
  # duplicate (the original is still in the queue waiting for retry).
  # Falls back to enqueueing a fresh copy only if the original is gone
  # (e.g., already moved to DLQ).
  msg_id = event["msg_id"]
  if msg_id && @client.message_exists?(event["queue_name"], msg_id: msg_id.to_i)
    @client.set_visibility_timeout(event["queue_name"], msg_id.to_i, vt: 0)
  else
    payload = JSON.parse(event["payload"])
    headers = event["headers"]
    headers = JSON.parse(headers) if headers.is_a?(String)
    @client.send_message(event["queue_name"], payload, headers: headers)
  end

  connection.exec_delete(
    "DELETE FROM pgbus_failed_events WHERE id = $1", "Pgbus Delete Failed Event", [id.to_i]
  )
  true
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error retrying failed event #{id}: #{e.message}" }
  false
end

#retry_job(queue_name, msg_id) ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 144

def retry_job(queue_name, msg_id)
  @client.set_visibility_timeout(queue_name, msg_id.to_i, vt: 0, prefixed: false)
end

#slowest_job_classes(limit: 10, minutes: 60) ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 686

def slowest_job_classes(limit: 10, minutes: 60)
  JobStat.slowest_classes(limit: limit, minutes: minutes)
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error fetching slowest classes: #{e.message}" }
  []
end

#stream_queue_names ⇒ Object

Physical queue names registered as stream queues (the pgbus_stream_queues registry). Stream delivery is a non-consuming peek, so stream messages sit visible with read_ct=0 forever — health verdicts must not read that as a wedge (issue #359). Loaded fresh per call (reset + one query): verdicts run on coarse intervals and a long-lived process must see streams registered since the last check. Degrades to an empty Set when the registry table is absent (pre-migration installs) or unreadable — StreamQueue swallows both.



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# File 'lib/pgbus/web/data_source.rb', line 76

def stream_queue_names
  StreamQueue.reset_cache!
  StreamQueue.all_names
end

#stream_stats_available? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/pgbus/web/data_source.rb', line 768

def stream_stats_available?
  Pgbus.configuration.streams_stats_enabled && StreamStat.table_exists?
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error checking stream stats availability: #{e.message}" }
  false
end

#stream_stats_summary(minutes: 60) ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 775

def stream_stats_summary(minutes: 60)
  StreamStat.summary(minutes: minutes)
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error fetching stream stats summary: #{e.message}" }
  {
    broadcasts: 0, connects: 0, disconnects: 0,
    active_estimate: 0, avg_fanout: 0,
    avg_broadcast_ms: 0, avg_connect_ms: 0
  }
end

#summary_stats ⇒ Object

Dashboard summary



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# File 'lib/pgbus/web/data_source.rb', line 15

def summary_stats
  queues = queues_with_metrics
  total_depth = queues.sum { |q| q[:queue_length] }
  total_visible = queues.sum { |q| q[:queue_visible_length] }
  dlq_suffix = Pgbus::DEAD_LETTER_SUFFIX
  dlq_depth = queues.select { |q| q[:name].end_with?(dlq_suffix) }.sum { |q| q[:queue_length] }

  throughput = compute_throughput(queues)

  health = queue_health_stats

  {
    total_queues: queues.size,
    total_depth: total_depth,
    total_visible: total_visible,
    active_processes: processes.count,
    failed_count: failed_events_count,
    dlq_depth: dlq_depth,
    recurring_count: recurring_tasks_count,
    throughput_rate: throughput,
    total_dead_tuples: health[:total_dead_tuples],
    tables_needing_vacuum: health[:tables_needing_vacuum],
    oldest_transaction_age_sec: health[:oldest_transaction_age_sec]
  }
end

#toggle_recurring_task(id) ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 529

def toggle_recurring_task(id)
  record = RecurringTask.find_by(id: id)
  return nil unless record

  record.update!(enabled: !record.enabled)
  record.enabled ? :enabled : :disabled
rescue StandardError => e
  Pgbus.logger.error { "[Pgbus::Web] Error toggling recurring task #{id}: #{e.message}" }
  nil
end

#top_streams(limit: 10, minutes: 60) ⇒ Object 



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# File 'lib/pgbus/web/data_source.rb', line 786

def top_streams(limit: 10, minutes: 60)
  StreamStat.top_streams(limit: limit, minutes: minutes)
rescue StandardError => e
  Pgbus.logger.debug { "[Pgbus::Web] Error fetching top streams: #{e.message}" }
  []
end