Class: Clacky::UI2::ProgressHandle

Inherits:
Object
  • Object
show all
Defined in:
lib/clacky/ui2/progress_handle.rb

Overview

An owned progress indicator.

Why this exists

The previous design had a single, globally-shared spinner slot on UiController (@progress_id / @progress_thread / @progress_message / @progress_start_time). Every caller — Agent#run, Agent#think, LlmCaller retry, idle compression, MemoryUpdater — wrote into the same slot and hoped to remember to close it. When control flow was interrupted (user types a new message during idle compression, AgentInterrupted is raised) a ticker thread would be left running and a new spinner would reuse the same entry, producing two concurrent tickers repainting the same line in different colors.

In the new design each caller owns a ProgressHandle. The handle encapsulates:

  • its own OutputBuffer entry id (may become nil while another handle is on top — see "Stack semantics" below);
  • its own ticker thread (exactly one per handle, stopped and joined on finish);
  • its own message, style, start time;

Owners (UiController) keep a stack of live handles and follow the protocol below.

Owner protocol

An "owner" must respond to three methods:

register_progress(handle) -> Integer (entry_id) | nil
Called exactly once when the handle starts. The owner pushes
the handle onto its stack, creates an OutputBuffer entry, and
returns that entry id. Before pushing, the owner may detach
the previous top-of-stack (Plan B: its entry is removed from
the buffer until the new top finishes).

unregister_progress(handle, final_frame:) -> void
Called exactly once when the handle finishes. The owner pops
the handle from its stack, renders +final_frame+ into the
entry (or removes the entry if +final_frame+ is nil), and may
reattach the new top-of-stack if one exists.

render_frame(handle, frame) -> void
Called by the ticker (and by +update+) on every paint. The
owner is responsible for ignoring the call if +handle+ is not
currently top-of-stack — the handle itself does NOT know about
the stack.

Stack semantics (Plan B)

When a new handle is pushed on top of an existing one, the lower handle's OutputBuffer entry is removed (owner calls __detach_entry! on it). When the new top finishes, the owner re-creates an entry for the lower handle and calls __reattach_entry! with the new id. This keeps the visible output clean: exactly one progress line on screen at a time, and no visual "stacking" of frozen progress lines.

Thread safety

The handle uses a Monitor (reentrant) to serialize state changes between the caller thread and the ticker thread. Public methods (+start+, update, finish) are safe to call from any thread.

Constant Summary collapse

DEFAULT_TICK_INTERVAL =

Default tick interval (seconds). Matches the old global spinner cadence. Tests may pass a smaller interval for speed.

0.25
VALID_STYLES =

Style hint for the renderer. The owner decides what colors to use; the handle only forwards the hint as part of the frame metadata so the renderer can pick between e.g. yellow "working" and gray "quiet" palettes.

:primary  — foreground task, should also update sessionbar
:quiet    — background task (idle compression, retries); does
          NOT bump sessionbar to 'working'
%i[primary quiet].freeze
FAST_FINISH_THRESHOLD_SECONDS =

Threshold (seconds) below which a quiet_on_fast_finish handle collapses its final frame — i.e. the progress line is REMOVED from the output buffer instead of being kept as a permanent "Executing foo… (0s)" log line. Operations that finish this fast didn't need a spinner in the first place; keeping the final frame would be visual noise.

2
IDLE_HINT_THRESHOLD_SECONDS =

Show "Thinking for Ns" once the gap since the last LLM stream chunk reaches this many seconds. Bedrock often pauses 5–18s while generating large content blocks (long tool_use JSON in particular); without this hint users assume the agent is stuck.

2
SPINNER_FRAMES = 
%w[⠋ ⠙ ⠹ ⠸ ⠼ ⠴ ⠦ ⠧ ⠇ ⠏].freeze
SPINNER_INTERVAL_MS = 
250

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(owner:, message:, style: :primary, tick_interval: DEFAULT_TICK_INTERVAL, quiet_on_fast_finish: false, clock: -> { Time.now }) ⇒ ProgressHandle

Returns a new instance of ProgressHandle.

Parameters:

  • owner (#register_progress, #unregister_progress, #render_frame)
  • message (String) —

    Initial progress message.

  • style (Symbol) (defaults to: :primary) —

    :primary or :quiet (see VALID_STYLES).

  • tick_interval (Float) (defaults to: DEFAULT_TICK_INTERVAL) —

    Seconds between auto-renders.

  • quiet_on_fast_finish (Boolean) (defaults to: false) —

    When true and the elapsed time on finish is under FAST_FINISH_THRESHOLD_SECONDS, the owner is told to remove the progress entry (+final_frame: nil+) instead of committing a permanent final frame. This is the preferred mode for tool execution wrappers, where fast tools (edit, write, read) don't need a lingering "Executing edit… (0s)" line after completion.

  • clock (#call) (defaults to: -> { Time.now }) —

    Test hook: returns current Time (default Time.now).



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# File 'lib/clacky/ui2/progress_handle.rb', line 114

def initialize(owner:, message:, style: :primary, tick_interval: DEFAULT_TICK_INTERVAL, quiet_on_fast_finish: false, clock: -> { Time.now })
  unless VALID_STYLES.include?(style)
    raise ArgumentError, "unknown progress style: #{style.inspect} (valid: #{VALID_STYLES.inspect})"
  end

  @owner                = owner
  @message              = message.to_s
  @style                = style
  @tick_interval        = tick_interval
  @quiet_on_fast_finish = quiet_on_fast_finish
  @clock                = clock

  @entry_id      = nil
  @start_time    = nil
  @ticker        = nil
  @state         = :fresh     # :fresh → :running → :closed
  @unregistered  = false
  @metadata      = {}
  @last_chunk_at = nil
  @monitor       = Monitor.new
end

Instance Attribute Details

#entry_id ⇒ Object (readonly)

Returns the value of attribute entry_id.



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# File 'lib/clacky/ui2/progress_handle.rb', line 86

def entry_id
  @entry_id
end

#message ⇒ Object (readonly)

Returns the value of attribute message.



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# File 'lib/clacky/ui2/progress_handle.rb', line 86

def message
  @message
end

#start_time ⇒ Object (readonly)

Returns the value of attribute start_time.



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# File 'lib/clacky/ui2/progress_handle.rb', line 86

def start_time
  @start_time
end

#style ⇒ Object (readonly)

Returns the value of attribute style.



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# File 'lib/clacky/ui2/progress_handle.rb', line 86

def style
  @style
end

Instance Method Details

#__detach_entry! ⇒ Object

Owner calls this when this handle is being pushed below a new top. The handle loses its OutputBuffer entry until restored.



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# File 'lib/clacky/ui2/progress_handle.rb', line 234

def __detach_entry!
  @monitor.synchronize { @entry_id = nil }
end

#__force_render! ⇒ Object

Test hook: force a synchronous render regardless of tick cadence.



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# File 'lib/clacky/ui2/progress_handle.rb', line 255

def __force_render!
  render_now
end

#__reattach_entry!(new_entry_id) ⇒ Object

Owner calls this when this handle becomes top-of-stack again (the handle above finished). A fresh entry id is supplied.



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# File 'lib/clacky/ui2/progress_handle.rb', line 240

def __reattach_entry!(new_entry_id)
  @monitor.synchronize { @entry_id = new_entry_id }
  render_now
end

#__rebind_entry!(new_entry_id) ⇒ Object

Like __reattach_entry! but skips the render_now hop. Used by the owner when it has just painted a frame into the new entry itself (e.g. while rotating the handle to remain at the buffer tail) and is still inside its own synchronization — calling render_now there would re-enter the owner's mutex.



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# File 'lib/clacky/ui2/progress_handle.rb', line 250

def __rebind_entry!(new_entry_id)
  @monitor.synchronize { @entry_id = new_entry_id }
end

#current_frame ⇒ Object

Compose the current visual frame. The owner gets this string via render_frame and is responsible for writing it into the entry.



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# File 'lib/clacky/ui2/progress_handle.rb', line 221

def current_frame
  @monitor.synchronize do
    compose_frame(@message, elapsed_seconds, @metadata, idle_seconds)
  end
end

#finish(final_message: nil) ⇒ Object Also known as: cancel

Stop the ticker, render one final frame, and unregister from the owner. Idempotent and crash-safe — if a previous finish was interrupted (e.g. Thread#raise(AgentInterrupted) hit between stop_ticker and unregister_progress), a follow-up finish will still complete the unregister so the handle does not stay orphaned on the owner's progress stack.

Parameters:

  • final_message (String, nil) (defaults to: nil) —

    Optional override for the last frame. If nil, the handle composes "… (s)".



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# File 'lib/clacky/ui2/progress_handle.rb', line 184

def finish(final_message: nil)
  snapshot = @monitor.synchronize do
    return if @unregistered
    first_close = @state == :running
    @state = :closed if first_close
    {
      first_close: first_close,
      message: final_message || @message,
      elapsed: elapsed_seconds,
    }
  end

  stop_ticker
  final_frame =
    if @quiet_on_fast_finish && snapshot[:elapsed] < FAST_FINISH_THRESHOLD_SECONDS
      nil
    else
      compose_final_frame(snapshot[:message], snapshot[:elapsed])
    end
  @owner.unregister_progress(self, final_frame: final_frame)
  @monitor.synchronize { @unregistered = true }
end

#running? ⇒ Boolean

True between start and finish.

Returns:

  • (Boolean) 


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# File 'lib/clacky/ui2/progress_handle.rb', line 215

def running?
  @monitor.synchronize { @state == :running }
end

#start ⇒ self

Start rendering. Registers with the owner (allocating an entry id and pushing onto its stack) and launches the ticker thread.

Returns:

  • (self) 


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# File 'lib/clacky/ui2/progress_handle.rb', line 140

def start
  @monitor.synchronize do
    return self unless @state == :fresh

    @state         = :running
    @start_time    = @clock.call
    @last_chunk_at = @start_time
    @entry_id      = @owner.register_progress(self)
  end

  # Fire one initial frame synchronously so the user sees the
  # spinner immediately — no "blank line for half a second" bug.
  render_now

  start_ticker
  self
end

#ticker_alive? ⇒ Boolean

True while the ticker thread is alive.

Returns:

  • (Boolean) 


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# File 'lib/clacky/ui2/progress_handle.rb', line 209

def ticker_alive?
  t = @ticker
  !!(t && t.alive?)
end

#update(message: nil, metadata: nil) ⇒ Object

Change the message or metadata mid-flight. Safe to call from any thread. Triggers an immediate re-render (if top-of-stack; the owner will ignore the call otherwise).

Parameters:

  • message (String, nil) (defaults to: nil)
  • metadata (Hash) (defaults to: nil) —

    Renderer-specific extras (e.g. retry counts).



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# File 'lib/clacky/ui2/progress_handle.rb', line 164

def update(message: nil, metadata: nil)
  @monitor.synchronize do
    return if @state != :running
    @message  = message.to_s if message
    if metadata
      @metadata = metadata
      @last_chunk_at = @clock.call
    end
  end
end