""" Stream Manager for Vegas Mode Manages plugin content streaming with look-ahead buffering. Maintains a queue of plugin content that's ready to be rendered, prefetching 1-2 plugins ahead of the current scroll position. Supports three display modes: - SCROLL: Continuous scrolling content - FIXED_SEGMENT: Fixed block that scrolls by - STATIC: Pause scroll to display (marked for coordinator handling) """ import logging import threading import time from typing import Optional, List, Dict, Any, Deque, Tuple, TYPE_CHECKING from collections import deque from dataclasses import dataclass, field from PIL import Image from src.vegas_mode.config import VegasModeConfig from src.vegas_mode.plugin_adapter import PluginAdapter from src.plugin_system.base_plugin import VegasDisplayMode if TYPE_CHECKING: from src.plugin_system.base_plugin import BasePlugin from src.plugin_system.plugin_manager import PluginManager logger = logging.getLogger(__name__) @dataclass class ContentSegment: """Represents a segment of scrollable content from a plugin.""" plugin_id: str images: List[Image.Image] total_width: int display_mode: VegasDisplayMode = field(default=VegasDisplayMode.FIXED_SEGMENT) fetched_at: float = field(default_factory=time.time) is_stale: bool = False @property def image_count(self) -> int: return len(self.images) @property def is_static(self) -> bool: """Check if this segment should trigger a static pause.""" return self.display_mode == VegasDisplayMode.STATIC class StreamManager: """ Manages streaming of plugin content for Vegas scroll mode. Key responsibilities: - Maintain ordered list of plugins to stream - Prefetch content 1-2 plugins ahead of current position - Handle plugin data updates via double-buffer swap - Manage content lifecycle and staleness """ def __init__( self, config: VegasModeConfig, plugin_manager: 'PluginManager', plugin_adapter: PluginAdapter ): """ Initialize the stream manager. Args: config: Vegas mode configuration plugin_manager: Plugin manager for accessing plugins plugin_adapter: Adapter for getting plugin content """ self.config = config self.plugin_manager = plugin_manager self.plugin_adapter = plugin_adapter # Content queue (double-buffered) self._active_buffer: Deque[ContentSegment] = deque() self._staging_buffer: Deque[ContentSegment] = deque() self._buffer_lock = threading.RLock() # RLock for reentrant access # Plugin rotation state self._ordered_plugins: List[str] = [] self._current_index: int = 0 self._prefetch_index: int = 0 # Update tracking self._pending_updates: Dict[str, bool] = {} self._last_refresh: float = 0.0 self._refresh_interval: float = 30.0 # Refresh plugin list every 30s # Statistics self.stats = { 'segments_fetched': 0, 'segments_served': 0, 'buffer_swaps': 0, 'fetch_errors': 0, } logger.info("StreamManager initialized with buffer_ahead=%d", config.buffer_ahead) def initialize(self) -> bool: """ Initialize the stream manager with current plugin list. Returns: True if initialized successfully with at least one plugin """ self._refresh_plugin_list() if not self._ordered_plugins: logger.warning("No plugins available for Vegas scroll") return False # Prefetch initial content self._prefetch_content(count=min(self.config.buffer_ahead + 1, len(self._ordered_plugins))) logger.info( "StreamManager initialized with %d plugins, %d segments buffered", len(self._ordered_plugins), len(self._active_buffer) ) return len(self._active_buffer) > 0 def get_next_segment(self) -> Optional[ContentSegment]: """ Get the next content segment for rendering. Returns: ContentSegment or None if buffer is empty """ with self._buffer_lock: if not self._active_buffer: # Try to fetch more content self._prefetch_content(count=1) if not self._active_buffer: return None segment = self._active_buffer.popleft() self.stats['segments_served'] += 1 # Trigger prefetch to maintain buffer self._ensure_buffer_filled() return segment def peek_next_segment(self) -> Optional[ContentSegment]: """ Peek at the next segment without removing it. Returns: ContentSegment or None if buffer is empty """ with self._buffer_lock: if self._active_buffer: return self._active_buffer[0] return None def get_buffer_status(self) -> Dict[str, Any]: """Get current buffer status for monitoring.""" with self._buffer_lock: return { 'active_count': len(self._active_buffer), 'staging_count': len(self._staging_buffer), 'total_plugins': len(self._ordered_plugins), 'current_index': self._current_index, 'prefetch_index': self._prefetch_index, 'stats': self.stats.copy(), } def get_active_plugin_ids(self) -> List[str]: """ Get list of plugin IDs currently in the active buffer. Thread-safe accessor for render pipeline. Returns: List of plugin IDs in buffer order """ with self._buffer_lock: return [seg.plugin_id for seg in self._active_buffer] def mark_plugin_updated(self, plugin_id: str) -> None: """ Mark a plugin as having updated data. Called when a plugin's data changes. Triggers content refresh for that plugin in the staging buffer. Args: plugin_id: Plugin that was updated """ with self._buffer_lock: self._pending_updates[plugin_id] = True logger.debug("Plugin %s marked for update", plugin_id) def has_pending_updates(self) -> bool: """Check if any plugins have pending updates awaiting processing.""" with self._buffer_lock: return len(self._pending_updates) > 0 def has_pending_updates_for_visible_segments(self) -> bool: """Check if pending updates affect plugins currently in the active buffer.""" with self._buffer_lock: if not self._pending_updates: return False active_ids = { seg.plugin_id for seg in self._active_buffer if seg.images } return bool(active_ids & self._pending_updates.keys()) def process_updates(self) -> None: """ Process pending plugin updates. Performs in-place update of segments in the active buffer, preserving non-updated plugins and their order. """ with self._buffer_lock: if not self._pending_updates: return updated_plugins = list(self._pending_updates.keys()) self._pending_updates.clear() # Fetch fresh content for each updated plugin (outside lock for slow ops) refreshed_segments = {} for plugin_id in updated_plugins: self.plugin_adapter.invalidate_cache(plugin_id) # Clear the plugin's scroll_helper cache so the visual is rebuilt # from fresh data (affects stocks, news, odds-ticker, etc.) plugin = None if hasattr(self.plugin_manager, 'plugins'): plugin = self.plugin_manager.plugins.get(plugin_id) if plugin: self.plugin_adapter.invalidate_plugin_scroll_cache(plugin, plugin_id) segment = self._fetch_plugin_content(plugin_id) if segment: refreshed_segments[plugin_id] = segment # In-place merge: replace segments in active buffer with self._buffer_lock: # Build new buffer preserving order, replacing updated segments new_buffer: Deque[ContentSegment] = deque() seen_plugins: set = set() for segment in self._active_buffer: if segment.plugin_id in refreshed_segments: # Replace with refreshed segment (only once per plugin) if segment.plugin_id not in seen_plugins: new_buffer.append(refreshed_segments[segment.plugin_id]) seen_plugins.add(segment.plugin_id) # Skip duplicate entries for same plugin else: # Keep non-updated segment new_buffer.append(segment) self._active_buffer = new_buffer logger.debug("Processed in-place updates for %d plugins", len(updated_plugins)) def swap_buffers(self) -> None: """ Swap active and staging buffers. Called when staging buffer has updated content ready. """ with self._buffer_lock: if self._staging_buffer: # True swap: staging becomes active, old active is discarded self._active_buffer, self._staging_buffer = self._staging_buffer, deque() self.stats['buffer_swaps'] += 1 logger.debug("Swapped buffers, active now has %d segments", len(self._active_buffer)) def refresh(self) -> None: """ Refresh the plugin list and content. Called periodically to pick up new plugins or config changes. """ current_time = time.time() if current_time - self._last_refresh < self._refresh_interval: return self._last_refresh = current_time old_count = len(self._ordered_plugins) self._refresh_plugin_list() if len(self._ordered_plugins) != old_count: logger.info( "Plugin list refreshed: %d -> %d plugins", old_count, len(self._ordered_plugins) ) def _refresh_plugin_list(self) -> None: """Refresh the ordered list of plugins from plugin manager.""" logger.info("=" * 60) logger.info("REFRESHING PLUGIN LIST FOR VEGAS SCROLL") logger.info("=" * 60) # Get all enabled plugins available_plugins = [] if hasattr(self.plugin_manager, 'plugins'): logger.info( "Checking %d loaded plugins for Vegas scroll", len(self.plugin_manager.plugins) ) for plugin_id, plugin in self.plugin_manager.plugins.items(): has_enabled = hasattr(plugin, 'enabled') is_enabled = getattr(plugin, 'enabled', False) logger.info( "[%s] class=%s, has_enabled=%s, enabled=%s", plugin_id, plugin.__class__.__name__, has_enabled, is_enabled ) if has_enabled and is_enabled: # Check vegas content type - skip 'none' unless in STATIC mode content_type = self.plugin_adapter.get_content_type(plugin, plugin_id) # Also check display mode - STATIC plugins should be included # even if their content_type is 'none' display_mode = VegasDisplayMode.FIXED_SEGMENT try: display_mode = plugin.get_vegas_display_mode() except Exception: # Plugin error should not abort refresh; use default mode logger.exception( "[%s] (%s) get_vegas_display_mode() failed, using default", plugin_id, plugin.__class__.__name__ ) logger.info( "[%s] content_type=%s, display_mode=%s", plugin_id, content_type, display_mode.value ) if content_type != 'none' or display_mode == VegasDisplayMode.STATIC: available_plugins.append(plugin_id) logger.info("[%s] --> INCLUDED in Vegas scroll", plugin_id) else: logger.info("[%s] --> EXCLUDED from Vegas scroll", plugin_id) else: logger.info("[%s] --> SKIPPED (not enabled)", plugin_id) else: logger.warning( "plugin_manager does not have plugins attribute: %s", type(self.plugin_manager).__name__ ) # Apply ordering from config (outside lock for potentially slow operation) ordered_plugins = self.config.get_ordered_plugins(available_plugins) logger.info( "Vegas scroll plugin list: %d available -> %d ordered", len(available_plugins), len(ordered_plugins) ) logger.info("Ordered plugins: %s", ordered_plugins) # Atomically update shared state under lock to avoid races with prefetchers with self._buffer_lock: self._ordered_plugins = ordered_plugins # Reset indices if needed if self._current_index >= len(self._ordered_plugins): self._current_index = 0 if self._prefetch_index >= len(self._ordered_plugins): self._prefetch_index = 0 logger.info("=" * 60) def _prefetch_content(self, count: int = 1) -> None: """ Prefetch content for upcoming plugins. Args: count: Number of plugins to prefetch """ with self._buffer_lock: if not self._ordered_plugins: return for _ in range(count): if len(self._active_buffer) >= self.config.buffer_ahead + 1: break # Ensure index is valid (guard against empty list) num_plugins = len(self._ordered_plugins) if num_plugins == 0: break plugin_id = self._ordered_plugins[self._prefetch_index] # Release lock for potentially slow content fetch self._buffer_lock.release() try: segment = self._fetch_plugin_content(plugin_id) finally: self._buffer_lock.acquire() if segment: self._active_buffer.append(segment) # Revalidate num_plugins after reacquiring lock (may have changed) num_plugins = len(self._ordered_plugins) if num_plugins == 0: break # Advance prefetch index (thread-safe within lock) self._prefetch_index = (self._prefetch_index + 1) % num_plugins def _fetch_plugin_content(self, plugin_id: str) -> Optional[ContentSegment]: """ Fetch content from a specific plugin. Args: plugin_id: Plugin to fetch from Returns: ContentSegment or None if fetch failed """ try: logger.info("=" * 60) logger.info("[%s] FETCHING CONTENT", plugin_id) logger.info("=" * 60) # Get plugin instance if not hasattr(self.plugin_manager, 'plugins'): logger.warning("[%s] plugin_manager has no plugins attribute", plugin_id) return None plugin = self.plugin_manager.plugins.get(plugin_id) if not plugin: logger.warning("[%s] Plugin not found in plugin_manager.plugins", plugin_id) return None logger.info( "[%s] Plugin found: class=%s, enabled=%s", plugin_id, plugin.__class__.__name__, getattr(plugin, 'enabled', 'N/A') ) # Get display mode from plugin display_mode = VegasDisplayMode.FIXED_SEGMENT try: display_mode = plugin.get_vegas_display_mode() logger.info("[%s] Display mode: %s", plugin_id, display_mode.value) except (AttributeError, TypeError) as e: logger.info( "[%s] get_vegas_display_mode() not available: %s (using FIXED_SEGMENT)", plugin_id, e ) # For STATIC mode, we create a placeholder segment # The actual content will be displayed by coordinator during pause if display_mode == VegasDisplayMode.STATIC: # Create minimal placeholder - coordinator handles actual display segment = ContentSegment( plugin_id=plugin_id, images=[], # No images needed for static pause total_width=0, display_mode=display_mode ) self.stats['segments_fetched'] += 1 logger.info( "[%s] Created STATIC placeholder (pause trigger)", plugin_id ) return segment # Get content via adapter for SCROLL/FIXED_SEGMENT modes logger.info("[%s] Calling plugin_adapter.get_content()...", plugin_id) images = self.plugin_adapter.get_content(plugin, plugin_id) if not images: logger.warning("[%s] NO CONTENT RETURNED from plugin_adapter", plugin_id) return None # Calculate total width total_width = sum(img.width for img in images) segment = ContentSegment( plugin_id=plugin_id, images=images, total_width=total_width, display_mode=display_mode ) self.stats['segments_fetched'] += 1 logger.info( "[%s] SEGMENT CREATED: %d images, %dpx total, mode=%s", plugin_id, len(images), total_width, display_mode.value ) logger.info("=" * 60) return segment except Exception: logger.exception("[%s] ERROR fetching content", plugin_id) self.stats['fetch_errors'] += 1 return None def _refresh_plugin_content(self, plugin_id: str) -> None: """ Refresh content for a specific plugin into staging buffer. Args: plugin_id: Plugin to refresh """ # Invalidate cached content self.plugin_adapter.invalidate_cache(plugin_id) # Fetch fresh content segment = self._fetch_plugin_content(plugin_id) if segment: with self._buffer_lock: self._staging_buffer.append(segment) logger.debug("Refreshed content for %s in staging buffer", plugin_id) def _ensure_buffer_filled(self) -> None: """Ensure buffer has enough content prefetched.""" if len(self._active_buffer) < self.config.buffer_ahead: needed = self.config.buffer_ahead - len(self._active_buffer) self._prefetch_content(count=needed) def get_all_content_for_composition(self) -> List[Image.Image]: """ Get all buffered content as a flat list of images. Used when composing the full scroll image. Skips STATIC segments as they don't have images to compose. Returns: List of all images in buffer order """ all_images = [] with self._buffer_lock: for segment in self._active_buffer: # Skip STATIC segments - they trigger pauses, not scroll content if segment.display_mode != VegasDisplayMode.STATIC: all_images.extend(segment.images) return all_images def advance_cycle(self) -> None: """ Advance to next cycle by clearing the active buffer. Called when a scroll cycle completes to allow fresh content to be fetched for the next cycle. Does not reset indices, so prefetching continues from the current position in the plugin order. """ with self._buffer_lock: consumed_count = len(self._active_buffer) self._active_buffer.clear() logger.debug("Advanced cycle, cleared %d segments", consumed_count) def reset(self) -> None: """Reset the stream manager state.""" with self._buffer_lock: self._active_buffer.clear() self._staging_buffer.clear() self._current_index = 0 self._prefetch_index = 0 self._pending_updates.clear() self.plugin_adapter.invalidate_cache() logger.info("StreamManager reset") def cleanup(self) -> None: """Clean up resources.""" self.reset() self.plugin_adapter.cleanup() logger.debug("StreamManager cleanup complete")