Bryan Van Deusen
535 lines
19 KiB
Python
535 lines
19 KiB
Python
"""Gallery-dl wrapper service.
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This service provides a clean interface for executing gallery-dl downloads
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with support for per-source configuration overrides.
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"""
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import json
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import logging
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import subprocess
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import sys
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import tempfile
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import time
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from dataclasses import dataclass, field
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from enum import Enum
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from pathlib import Path
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from typing import Optional
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from app.config import get_settings
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logger = logging.getLogger(__name__)
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class ErrorType(str, Enum):
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"""Error types for categorizing download failures."""
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AUTH_ERROR = "auth_error"
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RATE_LIMITED = "rate_limited"
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NOT_FOUND = "not_found"
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ACCESS_DENIED = "access_denied"
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NETWORK_ERROR = "network_error"
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NO_NEW_CONTENT = "no_new_content"
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TIMEOUT = "timeout"
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HTTP_ERROR = "http_error"
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UNSUPPORTED_URL = "unsupported_url"
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UNKNOWN_ERROR = "unknown_error"
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class ContentType(str, Enum):
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"""Content types that can be downloaded from platforms."""
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# Patreon content types
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IMAGES = "images"
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IMAGE_LARGE = "image_large"
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ATTACHMENTS = "attachments"
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POSTFILE = "postfile"
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CONTENT = "content" # Embedded content in post body
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# Generic types
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ALL = "all"
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@dataclass
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class SourceConfig:
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"""Per-source configuration that can override global settings.
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These settings are stored in the source's metadata field and merged
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with global defaults when executing downloads.
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"""
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# Content types to download (platform-specific)
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# For Patreon: ["images", "image_large", "attachments", "postfile", "content"]
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# For others: typically just ["all"] or specific types
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content_types: list[str] = field(default_factory=lambda: ["all"])
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# Rate limiting overrides
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sleep: Optional[float] = None # Delay between downloads
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sleep_request: Optional[float] = None # Delay between requests
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# Directory/filename pattern overrides
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directory_pattern: Optional[str] = None
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filename_pattern: Optional[str] = None
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# Other options
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skip_existing: bool = True # Skip files already in archive
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save_metadata: bool = True # Save JSON metadata alongside files
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timeout: int = 3600 # Download timeout in seconds
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@classmethod
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def from_dict(cls, data: dict) -> "SourceConfig":
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"""Create SourceConfig from a dictionary (e.g., from source.metadata)."""
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return cls(
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content_types=data.get("content_types", ["all"]),
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sleep=data.get("sleep"),
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sleep_request=data.get("sleep_request"),
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directory_pattern=data.get("directory_pattern"),
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filename_pattern=data.get("filename_pattern"),
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skip_existing=data.get("skip_existing", True),
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save_metadata=data.get("save_metadata", True),
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timeout=data.get("timeout", 3600),
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)
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def to_dict(self) -> dict:
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"""Convert to dictionary for storage."""
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return {
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"content_types": self.content_types,
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"sleep": self.sleep,
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"sleep_request": self.sleep_request,
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"directory_pattern": self.directory_pattern,
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"filename_pattern": self.filename_pattern,
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"skip_existing": self.skip_existing,
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"save_metadata": self.save_metadata,
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"timeout": self.timeout,
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}
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@dataclass
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class DownloadResult:
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"""Result of a gallery-dl download execution."""
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success: bool
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url: str
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subscription_name: str
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platform: str
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# Output details
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files_downloaded: int = 0
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stdout: str = ""
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stderr: str = ""
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return_code: int = 0
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# Error details (if failed)
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error_type: Optional[ErrorType] = None
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error_message: Optional[str] = None
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# Timing
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duration_seconds: float = 0.0
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started_at: Optional[str] = None
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completed_at: Optional[str] = None
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class GalleryDLService:
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"""Service for executing gallery-dl downloads.
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Handles:
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- Building gallery-dl configuration with per-source overrides
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- Executing the subprocess with proper error handling
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- Parsing output and categorizing errors
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- Managing temporary config files
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"""
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# Platform-specific default content types
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# Directory patterns are relative - subscription_name/platform is prepended automatically
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PLATFORM_DEFAULTS = {
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"patreon": {
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"content_types": ["images", "image_large", "attachments", "postfile", "content"],
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"directory": ["{date:%Y-%m-%d}_{id}_{title[:40]}"],
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"filename": "{num:>02}_{filename}.{extension}",
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},
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"subscribestar": {
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"content_types": ["all"],
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"directory": ["{date:%Y-%m-%d}_{id}_{title[:40]}"],
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"filename": "{num:>02}_{filename}.{extension}",
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},
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"hentaifoundry": {
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"content_types": ["pictures"],
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"directory": [], # Flat structure within platform folder
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"filename": "{category}_{index:>03}_{title[:50]}.{extension}",
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},
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"discord": {
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"content_types": ["all"],
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"directory": ["{channel}"],
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"filename": "{date:%Y%m%d}_{message_id}_{filename}.{extension}",
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},
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}
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def __init__(self):
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self.settings = get_settings()
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self._base_config = self._load_base_config()
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def _load_base_config(self) -> dict:
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"""Load the base gallery-dl configuration file."""
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config_path = Path(self.settings.config_path) / "gallery-dl.conf"
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if config_path.exists():
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try:
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with open(config_path) as f:
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return json.load(f)
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except json.JSONDecodeError as e:
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logger.warning(f"Invalid gallery-dl.conf, using defaults: {e}")
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# Return sensible defaults if no config exists
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return self._get_default_config()
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def _get_default_config(self) -> dict:
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"""Get default gallery-dl configuration."""
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return {
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"extractor": {
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"base-directory": self.settings.download_path,
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"archive": str(Path(self.settings.config_path) / "archive.sqlite3"),
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"skip": True,
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"sleep": self.settings.download_rate_limit,
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"sleep-request": max(1.0, self.settings.download_rate_limit / 2),
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"retries": 3,
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"timeout": 30.0,
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"verify": True,
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"postprocessors": [
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{
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"name": "metadata",
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"mode": "json",
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"directory": ".",
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"filename": "{filename}.json",
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}
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],
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},
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"downloader": {
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"part": True,
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"part-directory": str(Path(self.settings.config_path) / "temp"),
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"retries": 3,
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"timeout": 120.0,
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},
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"output": {
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"progress": True,
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},
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}
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def _build_config_for_source(
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self,
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platform: str,
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source_config: SourceConfig,
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destination: str,
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) -> dict:
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"""Build a merged configuration for a specific source.
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Merges: base config → platform defaults → source overrides
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"""
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config = json.loads(json.dumps(self._base_config)) # Deep copy
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# Get platform defaults
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platform_defaults = self.PLATFORM_DEFAULTS.get(platform, {})
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# Ensure extractor section exists
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if "extractor" not in config:
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config["extractor"] = {}
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# Apply base directory
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config["extractor"]["base-directory"] = destination
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# Apply rate limiting overrides
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if source_config.sleep is not None:
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config["extractor"]["sleep"] = source_config.sleep
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if source_config.sleep_request is not None:
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config["extractor"]["sleep-request"] = source_config.sleep_request
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# Apply skip setting
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config["extractor"]["skip"] = source_config.skip_existing
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# Configure metadata postprocessor
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if source_config.save_metadata:
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config["extractor"]["postprocessors"] = [
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{
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"name": "metadata",
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"mode": "json",
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"directory": ".",
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"filename": "{filename}.json",
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}
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]
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else:
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config["extractor"].pop("postprocessors", None)
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# Build platform-specific section
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platform_config = {}
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# Content types (platform-specific handling)
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if platform == "patreon":
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# Patreon uses "files" array for content types
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if "all" in source_config.content_types:
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platform_config["files"] = ["images", "image_large", "attachments", "postfile", "content"]
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else:
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platform_config["files"] = source_config.content_types
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elif platform == "hentaifoundry":
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# HentaiFoundry uses "include" for content filtering
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if "pictures" in source_config.content_types or "all" in source_config.content_types:
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platform_config["include"] = "pictures"
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# Directory pattern
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if source_config.directory_pattern:
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platform_config["directory"] = source_config.directory_pattern
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elif "directory" in platform_defaults:
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platform_config["directory"] = platform_defaults["directory"]
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# Filename pattern
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if source_config.filename_pattern:
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platform_config["filename"] = source_config.filename_pattern
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elif "filename" in platform_defaults:
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platform_config["filename"] = platform_defaults["filename"]
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# Always save metadata at platform level too
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platform_config["metadata"] = source_config.save_metadata
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# Add platform config to extractor
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config["extractor"][platform] = platform_config
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return config
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def _categorize_error(self, return_code: int, stdout: str, stderr: str) -> tuple[ErrorType, str]:
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"""Categorize the error based on output and return code."""
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combined = f"{stdout} {stderr}".lower()
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if "401" in combined or "unauthorized" in combined or "login" in combined:
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return ErrorType.AUTH_ERROR, "Authentication failed - cookies may be expired or invalid"
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if "429" in combined or "rate limit" in combined or "too many requests" in combined:
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return ErrorType.RATE_LIMITED, "Rate limited by server - try increasing sleep time"
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if "404" in combined or "not found" in combined:
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return ErrorType.NOT_FOUND, "URL not found - artist may have changed username or deleted content"
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if "timeout" in combined or "connection" in combined or "network" in combined:
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return ErrorType.NETWORK_ERROR, "Network error - check internet connection"
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if "403" in combined or "forbidden" in combined or "access denied" in combined:
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return ErrorType.ACCESS_DENIED, "Access denied - may need higher subscription tier"
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if return_code == 1 and ("no" in combined or "skip" in combined or not stdout.strip()):
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return ErrorType.NO_NEW_CONTENT, "No new content to download"
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if "http error" in combined:
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return ErrorType.HTTP_ERROR, "HTTP error occurred"
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if "no suitable" in combined or "unsupported" in combined:
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return ErrorType.UNSUPPORTED_URL, "URL format not supported by gallery-dl"
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return ErrorType.UNKNOWN_ERROR, f"Unknown error (return code: {return_code})"
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def _count_downloaded_files(self, stdout: str) -> int:
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"""Count the number of files downloaded from stdout.
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Gallery-dl outputs one line per downloaded file.
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Lines starting with '#' or containing 'skip' are not downloads.
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"""
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if not stdout:
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return 0
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count = 0
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for line in stdout.strip().split("\n"):
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line = line.strip()
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if line and not line.startswith("#") and "skip" not in line.lower():
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count += 1
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return count
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async def download(
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self,
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url: str,
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subscription_name: str,
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platform: str,
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source_config: Optional[SourceConfig] = None,
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cookies_path: Optional[str] = None,
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) -> DownloadResult:
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"""Execute a gallery-dl download.
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Args:
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url: The URL to download from
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subscription_name: Name of the subscription/artist (used for destination folder)
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platform: Platform name (patreon, subscribestar, etc.)
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source_config: Optional per-source configuration overrides
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cookies_path: Optional path to cookies file
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Returns:
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DownloadResult with success status and details
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Downloads are saved to: {download_path}/{subscription_name}/{platform}/{post_folders}
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"""
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import asyncio
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from datetime import datetime
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start_time = time.time()
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started_at = datetime.utcnow().isoformat()
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# Use default config if none provided
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if source_config is None:
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source_config = SourceConfig()
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# Build destination path: subscription_name/platform
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destination = str(Path(self.settings.download_path) / subscription_name / platform)
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# Build merged configuration
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config = self._build_config_for_source(platform, source_config, destination)
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# Add cookies if provided
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if cookies_path:
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config["extractor"]["cookies"] = cookies_path
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# Write temporary config file
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with tempfile.NamedTemporaryFile(
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mode="w",
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suffix=".json",
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delete=False,
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dir=self.settings.config_path,
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) as f:
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json.dump(config, f, indent=2)
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temp_config_path = f.name
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try:
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# Build command
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cmd = [
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sys.executable,
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"-m",
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"gallery_dl",
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"--config",
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temp_config_path,
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"--verbose",
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url,
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]
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logger.info(f"Executing gallery-dl for {subscription_name}/{platform}: {url}")
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logger.debug(f"Command: {' '.join(cmd)}")
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# Execute subprocess
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# Run in thread pool to not block async event loop
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loop = asyncio.get_event_loop()
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proc = await loop.run_in_executor(
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None,
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lambda: subprocess.run(
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cmd,
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capture_output=True,
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text=True,
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timeout=source_config.timeout,
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),
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)
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duration = time.time() - start_time
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completed_at = datetime.utcnow().isoformat()
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# Log output
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if proc.stdout:
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logger.debug(f"STDOUT for {subscription_name}/{platform}:\n{proc.stdout}")
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if proc.stderr:
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logger.debug(f"STDERR for {subscription_name}/{platform}:\n{proc.stderr}")
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# Determine success
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if proc.returncode == 0:
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return DownloadResult(
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success=True,
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url=url,
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subscription_name=subscription_name,
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platform=platform,
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files_downloaded=self._count_downloaded_files(proc.stdout),
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stdout=proc.stdout,
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stderr=proc.stderr,
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return_code=proc.returncode,
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duration_seconds=duration,
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started_at=started_at,
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completed_at=completed_at,
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)
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# Handle errors
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error_type, error_message = self._categorize_error(
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proc.returncode, proc.stdout, proc.stderr
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)
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# NO_NEW_CONTENT is considered successful
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success = error_type == ErrorType.NO_NEW_CONTENT
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return DownloadResult(
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success=success,
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url=url,
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subscription_name=subscription_name,
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platform=platform,
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files_downloaded=self._count_downloaded_files(proc.stdout) if success else 0,
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stdout=proc.stdout,
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stderr=proc.stderr,
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return_code=proc.returncode,
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error_type=error_type,
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error_message=error_message,
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duration_seconds=duration,
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started_at=started_at,
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completed_at=completed_at,
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)
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except subprocess.TimeoutExpired:
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duration = time.time() - start_time
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logger.error(f"Download timeout for {subscription_name}/{platform} after {duration:.1f}s")
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return DownloadResult(
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success=False,
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url=url,
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subscription_name=subscription_name,
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platform=platform,
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error_type=ErrorType.TIMEOUT,
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error_message=f"Download timed out after {source_config.timeout} seconds",
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duration_seconds=duration,
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started_at=started_at,
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completed_at=datetime.utcnow().isoformat(),
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)
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except Exception as e:
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duration = time.time() - start_time
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logger.exception(f"Unexpected error downloading {subscription_name}/{platform}: {e}")
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return DownloadResult(
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success=False,
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url=url,
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subscription_name=subscription_name,
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platform=platform,
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error_type=ErrorType.UNKNOWN_ERROR,
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error_message=str(e),
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duration_seconds=duration,
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started_at=started_at,
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completed_at=datetime.utcnow().isoformat(),
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)
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finally:
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# Clean up temporary config file
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try:
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Path(temp_config_path).unlink()
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except Exception:
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pass
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def get_platform_content_types(self, platform: str) -> list[str]:
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"""Get available content types for a platform.
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Useful for UI to show what options are available.
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"""
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if platform == "patreon":
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return ["images", "image_large", "attachments", "postfile", "content"]
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elif platform == "hentaifoundry":
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return ["pictures", "stories"]
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elif platform == "subscribestar":
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return ["all"] # No granular control
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elif platform == "discord":
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return ["all"] # No granular control
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else:
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return ["all"]
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def get_default_config_for_platform(self, platform: str) -> dict:
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"""Get the default configuration for a platform.
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Useful for showing defaults in UI.
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"""
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defaults = self.PLATFORM_DEFAULTS.get(platform, {})
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return {
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"content_types": defaults.get("content_types", ["all"]),
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"directory_pattern": defaults.get("directory"),
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"filename_pattern": defaults.get("filename"),
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"sleep": self.settings.download_rate_limit,
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"sleep_request": max(1.0, self.settings.download_rate_limit / 2),
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}
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