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4ead2c6b19
* Fix stale config singletons on reload * fix(config): update checkpointer imports after runtime move * Fix config reload singleton mutation on validation failure --------- Co-authored-by: Willem Jiang <willem.jiang@gmail.com>
50 lines
1.8 KiB
Python
50 lines
1.8 KiB
Python
"""Configuration for LangGraph checkpointer."""
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from typing import Literal
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from pydantic import BaseModel, Field
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CheckpointerType = Literal["memory", "sqlite", "postgres"]
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class CheckpointerConfig(BaseModel):
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"""Configuration for LangGraph state persistence checkpointer."""
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type: CheckpointerType = Field(
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description="Checkpointer backend type. "
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"'memory' is in-process only (lost on restart). "
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"'sqlite' persists to a local file (requires langgraph-checkpoint-sqlite). "
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"'postgres' persists to PostgreSQL (requires langgraph-checkpoint-postgres)."
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)
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connection_string: str | None = Field(
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default=None,
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description="Connection string for sqlite (file path) or postgres (DSN). "
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"Required for sqlite and postgres types. "
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"For sqlite, use a file path like '.deer-flow/checkpoints.db' or ':memory:' for in-memory. "
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"For postgres, use a DSN like 'postgresql://user:pass@localhost:5432/db'.",
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)
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# Global configuration instance — None means no checkpointer is configured.
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_checkpointer_config: CheckpointerConfig | None = None
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def get_checkpointer_config() -> CheckpointerConfig | None:
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"""Get the current checkpointer configuration, or None if not configured."""
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return _checkpointer_config
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def set_checkpointer_config(config: CheckpointerConfig | None) -> None:
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"""Set the checkpointer configuration."""
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global _checkpointer_config
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_checkpointer_config = config
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def load_checkpointer_config_from_dict(config_dict: dict | None) -> None:
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"""Load checkpointer configuration from a dictionary."""
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global _checkpointer_config
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if config_dict is None:
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_checkpointer_config = None
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return
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_checkpointer_config = CheckpointerConfig(**config_dict)
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