Module: Pgbus::CLI

Defined in:
lib/pgbus/cli.rb

Class Method Summary collapse

Class Method Details

.apply_capsule_filter(name) ⇒ Object 



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# File 'lib/pgbus/cli.rb', line 107

def apply_capsule_filter(name)
  capsule = Pgbus.configuration.capsule_named(name)
  unless capsule
    available = (Pgbus.configuration.workers || []).filter_map { |c| c[:name] || c["name"] }
    raise ArgumentError,
          "no capsule named #{name.inspect} (available: #{available.join(", ")})"
  end

  # Go through the public setter so any future normalization/validation
  # in workers= is applied consistently to the CLI override path too.
  Pgbus.configuration.workers = [capsule]
end

.apply_role_filter(options) ⇒ Object

Translates –workers-only / –scheduler-only / –dispatcher-only into the corresponding Pgbus.configuration.roles array. Mutually exclusive —passing more than one of the three flags raises ArgumentError.



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# File 'lib/pgbus/cli.rb', line 94

def apply_role_filter(options)
  role_flags = options.slice(*ROLE_FLAG_TO_ROLE.keys).compact
  return if role_flags.empty?

  if role_flags.size > 1
    raise ArgumentError,
          "--workers-only, --scheduler-only, and --dispatcher-only are mutually exclusive " \
          "(got: #{role_flags.keys.map { |k| "--#{k.to_s.tr("_", "-")}" }.join(", ")})"
  end

  Pgbus.configuration.roles = [ROLE_FLAG_TO_ROLE.fetch(role_flags.keys.first)]
end

.apply_start_options(args) ⇒ Object

Parses CLI flags for ‘pgbus start` and applies them to the global configuration before the supervisor boots. Designed to override the initializer config without requiring a redeploy.



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# File 'lib/pgbus/cli.rb', line 43

def apply_start_options(args)
  options = parse_start_options(args)

  Pgbus.configuration.workers = options[:queues] if options[:queues]
  Pgbus.configuration.execution_mode = options[:execution_mode].to_sym if options[:execution_mode]
  apply_capsule_filter(options[:capsule]) if options[:capsule]
  apply_role_filter(options)
end

.list_queues ⇒ Object 



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# File 'lib/pgbus/cli.rb', line 144

def list_queues
  Pgbus.client.list_queues
  metrics = Pgbus.client.metrics

  puts "QUEUE                                    DEPTH      VISIBLE    OLDEST (s)      TOTAL          "
  puts "-" * 95

  Array(metrics).each do |m|
    puts format("%-40s %-10s %-10s %-15s %-15s",
                m.queue_name, m.queue_length, m.queue_visible_length,
                m.oldest_msg_age_sec || "-", m.total_messages)
  end
end

.parse_start_options(args) ⇒ Object 



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# File 'lib/pgbus/cli.rb', line 52

def parse_start_options(args)
  options = {}
  OptionParser.new do |opts|
    opts.banner = "Usage: pgbus start [options]"

    opts.on("--queues STRING", "Override worker capsules (e.g. \"critical: 5; default: 10\")") do |v|
      options[:queues] = v
    end

    opts.on("--capsule NAME", "Run only the named capsule from the configured workers") do |v|
      options[:capsule] = v
    end

    opts.on("--workers-only", "Run only the worker processes (no scheduler/dispatcher/consumers/outbox)") do
      options[:workers_only] = true
    end

    opts.on("--scheduler-only", "Run only the recurring scheduler (the cron pod pattern)") do
      options[:scheduler_only] = true
    end

    opts.on("--dispatcher-only", "Run only the dispatcher (the maintenance pod pattern)") do
      options[:dispatcher_only] = true
    end

    opts.on("--execution-mode MODE", "Execution mode: threads (default) or async") do |v|
      options[:execution_mode] = v
    end
  end.parse!(args.dup)
  options
end

.print_help ⇒ Object 



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# File 'lib/pgbus/cli.rb', line 158

def print_help
  puts <<~HELP
    Usage: pgbus <command> [options]

    Commands:
      start    Start the Pgbus supervisor (workers + dispatcher)
      status   Show running Pgbus processes
      queues   List queues with metrics
      mcp      Start the read-only MCP diagnostic server over stdio
      version  Show version
      help     Show this help

    Options for `start`:
      --queues STRING    Override worker capsules from the CLI
                         (e.g. "critical: 5; default: 10")
      --capsule NAME     Run only the named capsule from the configured
                         workers (useful for one-capsule-per-process
                         deployments)
      --workers-only     Run only worker processes (no scheduler/
                         dispatcher/consumers/outbox — for worker-only
                         containers)
      --scheduler-only   Run only the recurring scheduler (the cron pod
                         pattern — exactly one of these per deployment)
      --dispatcher-only  Run only the dispatcher (the maintenance pod
                         pattern)
      --execution-mode   Execution mode: threads (default) or async
                         (fiber-based, lower connection usage)

    Environment for `mcp`:
      PGBUS_MCP_TOKEN          If set, PGBUS_MCP_AUTH_TOKEN must match for
                               the server to start (optional token gate).
      PGBUS_MCP_ALLOW_PAYLOADS Truthy to let tools return raw message
                               bodies/headers (off by default; redacted).
  HELP
end

.show_status ⇒ Object 



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# File 'lib/pgbus/cli.rb', line 120

def show_status
  processes = ProcessEntry.order(:kind, :created_at)
                          .select(:kind, :hostname, :pid, :metadata, :last_heartbeat_at)

  if processes.none?
    puts "No Pgbus processes running."
    return
  end

  puts "KIND         HOST                 PID      HEARTBEAT                      METADATA"
  puts "-" * 100
  processes.each do |p|
    puts format("%-12s %-20s %-8s %-30s %s",
                p.kind, p.hostname, p.pid, p.last_heartbeat_at, p.metadata)
  end
end

.start(args) ⇒ Object 



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# File 'lib/pgbus/cli.rb', line 9

def start(args)
  command = args.first || "help"

  case command
  when "start"
    start_supervisor(args[1..] || [])
  when "status"
    show_status
  when "queues"
    list_queues
  when "mcp"
    start_mcp_server
  when "version"
    puts "pgbus #{Pgbus::VERSION}"
  when "help", "--help", "-h"
    print_help
  else
    puts "Unknown command: #{command}"
    print_help
    exit 1
  end
end

.start_mcp_server ⇒ Object

Boots the read-only MCP diagnostic server over stdio. Loaded lazily so the optional ‘mcp` gem is only required when this command is invoked.



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# File 'lib/pgbus/cli.rb', line 139

def start_mcp_server
  Pgbus::MCP.load!
  Pgbus::MCP::Runner.run
end

.start_supervisor(args = []) ⇒ Object 



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# File 'lib/pgbus/cli.rb', line 32

def start_supervisor(args = [])
  apply_start_options(args)
  Pgbus.logger.info { "[Pgbus] Starting Pgbus #{Pgbus::VERSION}..." }

  supervisor = Process::Supervisor.new
  supervisor.run
end