mirror of
https://github.com/langchain-ai/langgraph.git
synced 2026-09-05 17:27:47 +02:00
cb7b924006
- Replaces checkpoint_during: bool - checkpoint_during is deprecated but still respected - We implement three durability modes (from least to most durable): - "exit" - save checkpoint only when the graph exits (equivalent to checkpoint_during=False) - "async" - save checkpoint asynchronously while the next step executes (the default, equivalent to old checkpoint_during=True) - "sync" - save checkpoint synchronously before the next step starts (new mode, slower but most durable) Co-authored-by: Sydney Runkle <54324534+sydney-runkle@users.noreply.github.com>
93 lines
3.4 KiB
Python
93 lines
3.4 KiB
Python
import pytest
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from typing_extensions import TypedDict
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from langgraph.checkpoint.base import BaseCheckpointSaver
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from langgraph.graph import END, START, StateGraph
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from langgraph.types import Durability
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pytestmark = pytest.mark.anyio
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def test_interruption_without_state_updates(
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sync_checkpointer: BaseCheckpointSaver, durability: Durability
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) -> None:
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"""Test interruption without state updates. This test confirms that
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interrupting doesn't require a state key having been updated in the prev step"""
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class State(TypedDict):
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input: str
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def noop(_state):
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pass
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builder = StateGraph(State)
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builder.add_node("step_1", noop)
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builder.add_node("step_2", noop)
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builder.add_node("step_3", noop)
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builder.add_edge(START, "step_1")
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builder.add_edge("step_1", "step_2")
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builder.add_edge("step_2", "step_3")
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builder.add_edge("step_3", END)
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graph = builder.compile(checkpointer=sync_checkpointer, interrupt_after="*")
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initial_input = {"input": "hello world"}
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thread = {"configurable": {"thread_id": "1"}}
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graph.invoke(initial_input, thread, durability=durability)
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assert graph.get_state(thread).next == ("step_2",)
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n_checkpoints = len([c for c in graph.get_state_history(thread)])
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assert n_checkpoints == (3 if durability != "exit" else 1)
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graph.invoke(None, thread, durability=durability)
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assert graph.get_state(thread).next == ("step_3",)
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n_checkpoints = len([c for c in graph.get_state_history(thread)])
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assert n_checkpoints == (4 if durability != "exit" else 2)
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graph.invoke(None, thread, durability=durability)
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assert graph.get_state(thread).next == ()
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n_checkpoints = len([c for c in graph.get_state_history(thread)])
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assert n_checkpoints == (5 if durability != "exit" else 3)
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async def test_interruption_without_state_updates_async(
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async_checkpointer: BaseCheckpointSaver, durability: Durability
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) -> None:
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"""Test interruption without state updates. This test confirms that
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interrupting doesn't require a state key having been updated in the prev step"""
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class State(TypedDict):
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input: str
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async def noop(_state):
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pass
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builder = StateGraph(State)
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builder.add_node("step_1", noop)
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builder.add_node("step_2", noop)
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builder.add_node("step_3", noop)
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builder.add_edge(START, "step_1")
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builder.add_edge("step_1", "step_2")
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builder.add_edge("step_2", "step_3")
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builder.add_edge("step_3", END)
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graph = builder.compile(checkpointer=async_checkpointer, interrupt_after="*")
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initial_input = {"input": "hello world"}
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thread = {"configurable": {"thread_id": "1"}}
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await graph.ainvoke(initial_input, thread, durability=durability)
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assert (await graph.aget_state(thread)).next == ("step_2",)
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n_checkpoints = len([c async for c in graph.aget_state_history(thread)])
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assert n_checkpoints == (3 if durability != "exit" else 1)
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await graph.ainvoke(None, thread, durability=durability)
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assert (await graph.aget_state(thread)).next == ("step_3",)
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n_checkpoints = len([c async for c in graph.aget_state_history(thread)])
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assert n_checkpoints == (4 if durability != "exit" else 2)
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await graph.ainvoke(None, thread, durability=durability)
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assert (await graph.aget_state(thread)).next == ()
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n_checkpoints = len([c async for c in graph.aget_state_history(thread)])
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assert n_checkpoints == (5 if durability != "exit" else 3)
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