mirror of
https://github.com/langchain-ai/langgraph.git
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456 lines
15 KiB
Python
456 lines
15 KiB
Python
import operator
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import time
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from concurrent.futures import ThreadPoolExecutor
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from contextlib import contextmanager
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from typing import Generator
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import pytest
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from langchain.schema.runnable import RunnablePassthrough
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from pytest_mock import MockerFixture
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from permchain import Channel, Pregel
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from permchain.channels.base import InvalidUpdateError
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from permchain.channels.binop import BinaryOperatorAggregate
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from permchain.channels.context import Context
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from permchain.channels.last_value import LastValue
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from permchain.channels.topic import Topic
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from permchain.checkpoint.memory import MemoryCheckpoint
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from permchain.pregel.reserved import ReservedChannels
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def test_invoke_single_process_in_out(mocker: MockerFixture) -> None:
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add_one = mocker.Mock(side_effect=lambda x: x + 1)
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chain = Channel.subscribe_to("input") | add_one | Channel.write_to("output")
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app = Pregel(
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chains={
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"one": chain,
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},
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channels={
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"input": LastValue(int),
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"output": LastValue(int),
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},
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input="input",
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output="output",
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)
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assert app.input_schema.schema() == {"title": "PregelInput", "type": "integer"}
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assert app.output_schema.schema() == {"title": "PregelOutput", "type": "integer"}
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assert app.invoke(2) == 3
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def test_invoke_single_process_in_out_implicit_channels(mocker: MockerFixture) -> None:
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add_one = mocker.Mock(side_effect=lambda x: x + 1)
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chain = Channel.subscribe_to("input") | add_one | Channel.write_to("output")
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app = Pregel(chains={"one": chain})
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assert app.input_schema.schema() == {"title": "PregelInput"}
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assert app.output_schema.schema() == {"title": "PregelOutput"}
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assert app.invoke(2) == 3
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def test_invoke_single_process_in_write_kwargs(mocker: MockerFixture) -> None:
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add_one = mocker.Mock(side_effect=lambda x: x + 1)
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chain = (
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Channel.subscribe_to("input")
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| add_one
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| Channel.write_to("output", fixed=5, output_plus_one=lambda x: x + 1)
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)
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app = Pregel(chains={"one": chain}, output=["output", "fixed", "output_plus_one"])
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assert app.input_schema.schema() == {"title": "PregelInput"}
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assert app.output_schema.schema() == {
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"title": "PregelOutput",
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"type": "object",
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"properties": {
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"output": {"title": "Output"},
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"fixed": {"title": "Fixed"},
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"output_plus_one": {"title": "Output Plus One"},
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},
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}
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assert app.invoke(2) == {"output": 3, "fixed": 5, "output_plus_one": 4}
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def test_invoke_single_process_in_out_reserved_is_last(mocker: MockerFixture) -> None:
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add_one = mocker.Mock(side_effect=lambda x: {**x, "input": x["input"] + 1})
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chain = (
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Channel.subscribe_to(["input"]).join([ReservedChannels.is_last_step])
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| add_one
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| Channel.write_to("output")
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)
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app = Pregel(chains={"one": chain})
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assert app.input_schema.schema() == {"title": "PregelInput"}
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assert app.output_schema.schema() == {"title": "PregelOutput"}
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assert app.invoke(2) == {"input": 3, "is_last_step": False}
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assert app.invoke(2, {"recursion_limit": 1}) == {"input": 3, "is_last_step": True}
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def test_invoke_single_process_in_out_dict(mocker: MockerFixture) -> None:
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add_one = mocker.Mock(side_effect=lambda x: x + 1)
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chain = Channel.subscribe_to("input") | add_one | Channel.write_to("output")
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app = Pregel(
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chains={
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"one": chain,
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},
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output=["output"],
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)
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assert app.input_schema.schema() == {"title": "PregelInput"}
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assert app.output_schema.schema() == {
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"title": "PregelOutput",
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"type": "object",
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"properties": {"output": {"title": "Output"}},
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}
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assert app.invoke(2) == {"output": 3}
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def test_invoke_single_process_in_dict_out_dict(mocker: MockerFixture) -> None:
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add_one = mocker.Mock(side_effect=lambda x: x + 1)
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chain = Channel.subscribe_to("input") | add_one | Channel.write_to("output")
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app = Pregel(
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chains={
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"one": chain,
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},
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input=["input"],
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output=["output"],
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)
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assert app.input_schema.schema() == {
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"title": "PregelInput",
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"type": "object",
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"properties": {"input": {"title": "Input"}},
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}
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assert app.output_schema.schema() == {
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"title": "PregelOutput",
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"type": "object",
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"properties": {"output": {"title": "Output"}},
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}
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assert app.invoke({"input": 2}) == {"output": 3}
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def test_invoke_two_processes_in_out(mocker: MockerFixture) -> None:
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add_one = mocker.Mock(side_effect=lambda x: x + 1)
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chain_one = Channel.subscribe_to("input") | add_one | Channel.write_to("inbox")
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chain_two = (
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Channel.subscribe_to_each("inbox") | add_one | Channel.write_to("output")
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)
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app = Pregel(
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chains={"chain_one": chain_one, "chain_two": chain_two},
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channels={"inbox": Topic(int)},
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)
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assert app.invoke(2) == 4
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def test_invoke_two_processes_in_dict_out(mocker: MockerFixture) -> None:
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add_one = mocker.Mock(side_effect=lambda x: x + 1)
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chain_one = Channel.subscribe_to("input") | add_one | Channel.write_to("inbox")
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chain_two = (
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Channel.subscribe_to_each("inbox") | add_one | Channel.write_to("output")
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)
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app = Pregel(
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chains={"chain_one": chain_one, "chain_two": chain_two},
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channels={"inbox": Topic(int)},
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input=["input", "inbox"],
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)
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assert [*app.stream({"input": 2, "inbox": 12})] == [13, 4] # [12 + 1, 2 + 1 + 1]
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def test_batch_two_processes_in_out() -> None:
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def add_one_with_delay(inp: int) -> int:
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time.sleep(inp / 10)
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return inp + 1
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chain_one = (
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Channel.subscribe_to("input") | add_one_with_delay | Channel.write_to("one")
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)
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chain_two = (
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Channel.subscribe_to("one") | add_one_with_delay | Channel.write_to("output")
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)
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app = Pregel(chains={"chain_one": chain_one, "chain_two": chain_two})
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assert app.batch([3, 2, 1, 3, 5]) == [5, 4, 3, 5, 7]
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def test_invoke_many_processes_in_out(mocker: MockerFixture) -> None:
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test_size = 100
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add_one = mocker.Mock(side_effect=lambda x: x + 1)
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chains = {"-1": Channel.subscribe_to("input") | add_one | Channel.write_to("-1")}
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for i in range(test_size - 2):
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chains[str(i)] = (
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Channel.subscribe_to(str(i - 1)) | add_one | Channel.write_to(str(i))
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)
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chains["last"] = Channel.subscribe_to(str(i)) | add_one | Channel.write_to("output")
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app = Pregel(chains=chains)
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for _ in range(10):
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assert app.invoke(2, {"recursion_limit": test_size}) == 2 + test_size
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with ThreadPoolExecutor() as executor:
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assert [
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*executor.map(app.invoke, [2] * 10, [{"recursion_limit": test_size}] * 10)
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] == [2 + test_size] * 10
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def test_batch_many_processes_in_out(mocker: MockerFixture) -> None:
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test_size = 100
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add_one = mocker.Mock(side_effect=lambda x: x + 1)
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chains = {"-1": Channel.subscribe_to("input") | add_one | Channel.write_to("-1")}
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for i in range(test_size - 2):
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chains[str(i)] = (
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Channel.subscribe_to(str(i - 1)) | add_one | Channel.write_to(str(i))
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)
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chains["last"] = Channel.subscribe_to(str(i)) | add_one | Channel.write_to("output")
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app = Pregel(chains=chains)
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for _ in range(3):
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assert app.batch([2, 1, 3, 4, 5], {"recursion_limit": test_size}) == [
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2 + test_size,
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1 + test_size,
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3 + test_size,
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4 + test_size,
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5 + test_size,
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]
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with ThreadPoolExecutor() as executor:
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assert [
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*executor.map(
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app.batch, [[2, 1, 3, 4, 5]] * 3, [{"recursion_limit": test_size}] * 3
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)
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] == [
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[2 + test_size, 1 + test_size, 3 + test_size, 4 + test_size, 5 + test_size]
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] * 3
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def test_invoke_two_processes_two_in_two_out_invalid(mocker: MockerFixture) -> None:
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add_one = mocker.Mock(side_effect=lambda x: x + 1)
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chain_one = Channel.subscribe_to("input") | add_one | Channel.write_to("output")
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chain_two = Channel.subscribe_to("input") | add_one | Channel.write_to("output")
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app = Pregel(chains={"chain_one": chain_one, "chain_two": chain_two})
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with pytest.raises(InvalidUpdateError):
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# LastValue channels can only be updated once per iteration
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app.invoke(2)
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def test_invoke_two_processes_two_in_two_out_valid(mocker: MockerFixture) -> None:
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add_one = mocker.Mock(side_effect=lambda x: x + 1)
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chain_one = Channel.subscribe_to("input") | add_one | Channel.write_to("output")
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chain_two = Channel.subscribe_to("input") | add_one | Channel.write_to("output")
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app = Pregel(
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chains={"chain_one": chain_one, "chain_two": chain_two},
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channels={"output": Topic(int)},
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)
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# An Inbox channel accumulates updates into a sequence
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assert app.invoke(2) == [3, 3]
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def test_invoke_checkpoint(mocker: MockerFixture) -> None:
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add_one = mocker.Mock(side_effect=lambda x: x["total"] + x["input"])
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def raise_if_above_10(input: int) -> int:
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if input > 10:
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raise ValueError("Input is too large")
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return input
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chain_one = (
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Channel.subscribe_to(["input"]).join(["total"])
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| add_one
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| Channel.write_to("output", "total")
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| raise_if_above_10
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)
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app = Pregel(
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chains={"chain_one": chain_one},
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channels={"total": BinaryOperatorAggregate(int, operator.add)},
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checkpoint=MemoryCheckpoint(),
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)
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# total starts out as 0, so output is 0+2=2
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assert app.invoke(2, {"configurable": {"thread_id": "1"}}) == 2
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assert app.checkpoint.get({"configurable": {"thread_id": "1"}}).get("total") == 2
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# total is now 2, so output is 2+3=5
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assert app.invoke(3, {"configurable": {"thread_id": "1"}}) == 5
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assert app.checkpoint.get({"configurable": {"thread_id": "1"}}).get("total") == 7
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# total is now 2+5=7, so output would be 7+4=11, but raises ValueError
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with pytest.raises(ValueError):
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app.invoke(4, {"configurable": {"thread_id": "1"}})
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# checkpoint is not updated
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assert app.checkpoint.get({"configurable": {"thread_id": "1"}}).get("total") == 7
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# on a new thread, total starts out as 0, so output is 0+5=5
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assert app.invoke(5, {"configurable": {"thread_id": "2"}}) == 5
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assert app.checkpoint.get({"configurable": {"thread_id": "1"}}).get("total") == 7
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assert app.checkpoint.get({"configurable": {"thread_id": "2"}}).get("total") == 5
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def test_invoke_two_processes_two_in_join_two_out(mocker: MockerFixture) -> None:
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add_one = mocker.Mock(side_effect=lambda x: x + 1)
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add_10_each = mocker.Mock(side_effect=lambda x: sorted(y + 10 for y in x))
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chain_one = Channel.subscribe_to("input") | add_one | Channel.write_to("inbox")
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chain_three = Channel.subscribe_to("input") | add_one | Channel.write_to("inbox")
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chain_four = (
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Channel.subscribe_to("inbox") | add_10_each | Channel.write_to("output")
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)
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app = Pregel(
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chains={
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"chain_one": chain_one,
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"chain_three": chain_three,
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"chain_four": chain_four,
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},
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channels={"inbox": Topic(int)},
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)
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# Then invoke app
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# We get a single array result as chain_four waits for all publishers to finish
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# before operating on all elements published to topic_two as an array
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for _ in range(100):
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assert app.invoke(2) == [13, 13]
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with ThreadPoolExecutor() as executor:
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assert [*executor.map(app.invoke, [2] * 100)] == [[13, 13]] * 100
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def test_invoke_join_then_call_other_app(mocker: MockerFixture) -> None:
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add_one = mocker.Mock(side_effect=lambda x: x + 1)
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add_10_each = mocker.Mock(side_effect=lambda x: [y + 10 for y in x])
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inner_app = Pregel(
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chains={
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"one": Channel.subscribe_to("input") | add_one | Channel.write_to("output")
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}
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)
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chain_one = (
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Channel.subscribe_to("input")
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| add_10_each
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| Channel.write_to("inbox_one").map()
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)
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chain_two = (
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Channel.subscribe_to("inbox_one")
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| inner_app.map()
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| sorted
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| Channel.write_to("outbox_one")
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)
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chain_three = Channel.subscribe_to("outbox_one") | sum | Channel.write_to("output")
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app = Pregel(
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chains={
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"chain_one": chain_one,
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"chain_two": chain_two,
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"chain_three": chain_three,
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},
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channels={"inbox_one": Topic(int)},
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)
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for _ in range(10):
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assert app.invoke([2, 3]) == 27
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with ThreadPoolExecutor() as executor:
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assert [*executor.map(app.invoke, [[2, 3]] * 10)] == [27] * 10
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def test_invoke_two_processes_one_in_two_out(mocker: MockerFixture) -> None:
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add_one = mocker.Mock(side_effect=lambda x: x + 1)
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chain_one = (
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Channel.subscribe_to("input")
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| add_one
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| Channel.write_to(output=RunnablePassthrough(), between=RunnablePassthrough())
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)
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chain_two = Channel.subscribe_to("between") | add_one | Channel.write_to("output")
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app = Pregel(
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chains={"chain_one": chain_one, "chain_two": chain_two},
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)
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assert [c for c in app.stream(2)] == [3, 4]
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def test_invoke_two_processes_no_out(mocker: MockerFixture) -> None:
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add_one = mocker.Mock(side_effect=lambda x: x + 1)
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chain_one = Channel.subscribe_to("input") | add_one | Channel.write_to("between")
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chain_two = Channel.subscribe_to("between") | add_one
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app = Pregel(
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chains={"chain_one": chain_one, "chain_two": chain_two},
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)
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# It finishes executing (once no more messages being published)
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# but returns nothing, as nothing was published to OUT topic
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assert app.invoke(2) is None
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def test_invoke_two_processes_no_in(mocker: MockerFixture) -> None:
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add_one = mocker.Mock(side_effect=lambda x: x + 1)
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chain_one = Channel.subscribe_to("between") | add_one | Channel.write_to("output")
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chain_two = Channel.subscribe_to("between") | add_one
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with pytest.raises(ValueError):
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Pregel(
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chains={"chain_one": chain_one, "chain_two": chain_two},
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)
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def test_channel_enter_exit_timing(mocker: MockerFixture) -> None:
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setup = mocker.Mock()
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cleanup = mocker.Mock()
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@contextmanager
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def an_int() -> Generator[int, None, None]:
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setup()
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try:
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yield 5
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finally:
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cleanup()
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add_one = mocker.Mock(side_effect=lambda x: x + 1)
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chain_one = Channel.subscribe_to("input") | add_one | Channel.write_to("inbox")
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chain_two = (
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Channel.subscribe_to_each("inbox") | add_one | Channel.write_to("output")
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)
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app = Pregel(
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chains={"chain_one": chain_one, "chain_two": chain_two},
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channels={
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"inbox": Topic(int),
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"ctx": Context(an_int, typ=int),
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},
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output=["inbox", "output"],
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)
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assert setup.call_count == 0
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assert cleanup.call_count == 0
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for i, chunk in enumerate(app.stream(2)):
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assert setup.call_count == 1, "Expected setup to be called once"
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assert cleanup.call_count == 0, "Expected cleanup to not be called yet"
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if i == 0:
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assert chunk == {"inbox": [3]}
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elif i == 1:
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assert chunk == {"output": 4}
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else:
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assert False, "Expected only two chunks"
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assert cleanup.call_count == 1, "Expected cleanup to be called once"
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