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Lightweight dependency-injection container.
The Container is a plain dataclass that holds fully-configured service
instances. It is built once at CLI startup (or test setup) and threaded
through all commands via Typer's callback context object.
Usage (CLI):
@app.callback()
def main(ctx: typer.Context) -> None:
ctx.obj = Container.build()
Usage (tests):
container = Container.build(settings=fake_settings)
container.collector = FakeCollector()
"""
from __future__ import annotations
from dataclasses import dataclass, field
from typing import TYPE_CHECKING
from app.utils.config import Settings, get_settings
from app.utils.logging import setup_logging
if TYPE_CHECKING:
from app.collectors.base import CollectorProtocol
from app.dedup.registry import DedupRegistry
from app.exporters.hf import HFExporter
from app.exporters.jsonl import JsonlExporter
from app.exporters.parquet import ParquetExporter
from app.metadata.extractor import MetadataExtractor
from app.preview.renderer import PreviewRenderer
from app.validators.content import ContentValidator
from app.validators.schema import SchemaValidator
@dataclass
class Container:
"""
Resolved service graph for the KDC application.
All services are injected as concrete instances but typed against
their Protocol / base class for testability.
"""
settings: Settings
# Services (populated by build())
collector: CollectorProtocol | None = field(default=None, repr=False)
extractor: MetadataExtractor | None = field(default=None, repr=False)
renderer: PreviewRenderer | None = field(default=None, repr=False)
schema_validator: SchemaValidator | None = field(default=None, repr=False)
content_validator: ContentValidator | None = field(default=None, repr=False)
dedup_registry: DedupRegistry | None = field(default=None, repr=False)
parquet_exporter: ParquetExporter | None = field(default=None, repr=False)
jsonl_exporter: JsonlExporter | None = field(default=None, repr=False)
hf_exporter: HFExporter | None = field(default=None, repr=False)
# ── Factory ───────────────────────────────────────────────────────────────
@classmethod
def build(cls, settings: Settings | None = None) -> Container:
"""
Instantiate and wire all services from Settings.
Imports are local to avoid circular dependencies at module level.
"""
from app.collectors.local import LocalCollector
from app.dedup.registry import DedupRegistry
from app.exporters.hf import HFExporter
from app.exporters.jsonl import JsonlExporter
from app.exporters.parquet import ParquetExporter
from app.metadata.extractor import MetadataExtractor
from app.preview.renderer import PreviewRenderer
from app.validators.content import ContentValidator
from app.validators.schema import SchemaValidator
cfg = settings or get_settings()
# Configure logging from settings
setup_logging(
level=cfg.logging.level,
sink_file=cfg.logging.sink_file,
rotation=cfg.logging.rotation,
retention=cfg.logging.retention,
)
return cls(
settings=cfg,
collector=LocalCollector(pdf_dir=cfg.paths.pdf_dir),
extractor=MetadataExtractor(
fallback_to_pypdf=cfg.metadata.fallback_to_pypdf,
),
renderer=PreviewRenderer(
out_dir=cfg.paths.preview_dir,
dpi=cfg.preview.dpi,
fmt=cfg.preview.format,
max_pages=cfg.preview.max_pages,
),
schema_validator=SchemaValidator(),
content_validator=ContentValidator(
min_file_size_kb=cfg.metadata.min_file_size_kb,
max_file_size_mb=cfg.metadata.max_file_size_mb,
),
dedup_registry=DedupRegistry(
registry_path=cfg.paths.dedup_registry,
enabled=cfg.dedup.enabled,
),
parquet_exporter=ParquetExporter(
out_dir=cfg.paths.datasets_dir,
),
jsonl_exporter=JsonlExporter(
out_dir=cfg.paths.datasets_dir,
),
hf_exporter=HFExporter(
repo_id=cfg.huggingface.repo_id,
token=cfg.huggingface.token,
),
)
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