mirror of
https://github.com/HKUDS/nanobot.git
synced 2026-05-19 16:12:30 +00:00
365 lines
12 KiB
Python
365 lines
12 KiB
Python
"""Tests for FallbackProvider model failover."""
|
|
|
|
from __future__ import annotations
|
|
|
|
from typing import Any
|
|
from unittest.mock import MagicMock
|
|
|
|
import pytest
|
|
|
|
from nanobot.providers.base import LLMProvider, LLMResponse
|
|
from nanobot.providers.fallback_provider import FallbackProvider
|
|
|
|
|
|
def _make_response(
|
|
content: str = "ok",
|
|
finish_reason: str = "stop",
|
|
*,
|
|
error_kind: str | None = None,
|
|
) -> LLMResponse:
|
|
return LLMResponse(content=content, finish_reason=finish_reason, error_kind=error_kind)
|
|
|
|
|
|
def _error_response(content: str = "api error") -> LLMResponse:
|
|
return _make_response(content, finish_reason="error", error_kind="server_error")
|
|
|
|
|
|
class _FakeProvider(LLMProvider):
|
|
"""Fake provider for testing."""
|
|
|
|
def __init__(self, name: str = "fake", response: LLMResponse | None = None):
|
|
super().__init__()
|
|
self.name = name
|
|
self._response = response or _make_response()
|
|
self.chat_calls: list[dict[str, Any]] = []
|
|
self.chat_stream_calls: list[dict[str, Any]] = []
|
|
|
|
def get_default_model(self) -> str:
|
|
return f"{self.name}/model"
|
|
|
|
async def chat(self, **kwargs: Any) -> LLMResponse:
|
|
self.chat_calls.append(dict(kwargs))
|
|
return self._response
|
|
|
|
async def chat_stream(self, **kwargs: Any) -> LLMResponse:
|
|
self.chat_stream_calls.append(dict(kwargs))
|
|
on_delta = kwargs.get("on_content_delta")
|
|
if on_delta and self._response.content:
|
|
await on_delta(self._response.content)
|
|
return self._response
|
|
|
|
|
|
# -- config-level tests --
|
|
|
|
|
|
def test_fallback_models_default_empty() -> None:
|
|
from nanobot.config.schema import ModelPresetConfig
|
|
p = ModelPresetConfig(model="test/model")
|
|
assert p.fallback_models == []
|
|
|
|
|
|
def test_fallback_models_accepts_list() -> None:
|
|
from nanobot.config.schema import ModelPresetConfig
|
|
p = ModelPresetConfig(model="test/primary", fallback_models=["test/a", "test/b"])
|
|
assert p.fallback_models == ["test/a", "test/b"]
|
|
|
|
|
|
def test_fallback_models_from_camel_case() -> None:
|
|
from nanobot.config.schema import ModelPresetConfig
|
|
p = ModelPresetConfig.model_validate({
|
|
"model": "test/primary",
|
|
"fallbackModels": ["test/a"],
|
|
})
|
|
assert p.fallback_models == ["test/a"]
|
|
|
|
|
|
# -- FallbackProvider tests --
|
|
|
|
|
|
class TestNoFallbackWhenPrimarySucceeds:
|
|
@pytest.mark.asyncio
|
|
async def test(self) -> None:
|
|
primary = _FakeProvider("primary", _make_response("primary ok"))
|
|
factory = MagicMock()
|
|
fb = FallbackProvider(
|
|
primary=primary,
|
|
fallback_models=["fallback-a"],
|
|
provider_factory=factory,
|
|
)
|
|
|
|
result = await fb.chat(messages=[{"role": "user", "content": "hi"}])
|
|
assert result.content == "primary ok"
|
|
assert result.finish_reason == "stop"
|
|
factory.assert_not_called()
|
|
|
|
|
|
class TestFallbackOnPrimaryError:
|
|
@pytest.mark.asyncio
|
|
async def test_first_fallback_succeeds(self) -> None:
|
|
primary = _FakeProvider("primary", _error_response())
|
|
fallback = _FakeProvider("fallback", _make_response("fallback ok"))
|
|
factory = MagicMock(return_value=fallback)
|
|
|
|
fb = FallbackProvider(
|
|
primary=primary,
|
|
fallback_models=["fallback-a"],
|
|
provider_factory=factory,
|
|
)
|
|
|
|
result = await fb.chat(messages=[{"role": "user", "content": "hi"}], model="primary-model")
|
|
assert result.content == "fallback ok"
|
|
assert result.finish_reason == "stop"
|
|
factory.assert_called_once_with("fallback-a")
|
|
assert primary.chat_calls[0]["model"] == "primary-model"
|
|
assert fallback.chat_calls[0]["model"] == "fallback-a"
|
|
|
|
|
|
class TestNoFallbackWhenContentStreamed:
|
|
@pytest.mark.asyncio
|
|
async def test(self) -> None:
|
|
primary = _FakeProvider("primary", _error_response())
|
|
factory = MagicMock()
|
|
fb = FallbackProvider(
|
|
primary=primary,
|
|
fallback_models=["fallback-a"],
|
|
provider_factory=factory,
|
|
)
|
|
|
|
async def _delta(text: str) -> None:
|
|
pass
|
|
|
|
result = await fb.chat_stream(
|
|
messages=[{"role": "user", "content": "hi"}],
|
|
on_content_delta=_delta,
|
|
)
|
|
# Primary returns error but content was "streamed" (FakeProvider calls delta)
|
|
# so failover should be skipped
|
|
assert result.finish_reason == "error"
|
|
factory.assert_not_called()
|
|
|
|
|
|
class TestFailoverOnTransientError:
|
|
@pytest.mark.asyncio
|
|
async def test_rate_limit(self) -> None:
|
|
primary = _FakeProvider("primary", _error_response("rate limit exceeded"))
|
|
fallback = _FakeProvider("fallback", _make_response("fallback ok"))
|
|
factory = MagicMock(return_value=fallback)
|
|
fb = FallbackProvider(
|
|
primary=primary,
|
|
fallback_models=["fallback-a"],
|
|
provider_factory=factory,
|
|
)
|
|
|
|
result = await fb.chat(messages=[{"role": "user", "content": "hi"}])
|
|
assert result.content == "fallback ok"
|
|
assert result.finish_reason == "stop"
|
|
factory.assert_called_once_with("fallback-a")
|
|
|
|
@pytest.mark.asyncio
|
|
async def test_timeout(self) -> None:
|
|
primary = _FakeProvider(
|
|
"primary",
|
|
_make_response("timed out", finish_reason="error", error_kind="timeout"),
|
|
)
|
|
fallback = _FakeProvider("fallback", _make_response("fallback ok"))
|
|
factory = MagicMock(return_value=fallback)
|
|
fb = FallbackProvider(
|
|
primary=primary,
|
|
fallback_models=["fallback-a"],
|
|
provider_factory=factory,
|
|
)
|
|
|
|
result = await fb.chat(messages=[{"role": "user", "content": "hi"}])
|
|
assert result.content == "fallback ok"
|
|
assert result.finish_reason == "stop"
|
|
factory.assert_called_once_with("fallback-a")
|
|
|
|
|
|
class TestFallbackTriesModelsInOrder:
|
|
@pytest.mark.asyncio
|
|
async def test(self) -> None:
|
|
primary = _FakeProvider("primary", _error_response("primary fail"))
|
|
fallback_a = _FakeProvider("a", _error_response("a fail"))
|
|
fallback_b = _FakeProvider("b", _make_response("b ok"))
|
|
factory = MagicMock(side_effect=[fallback_a, fallback_b])
|
|
|
|
fb = FallbackProvider(
|
|
primary=primary,
|
|
fallback_models=["fallback-a", "fallback-b"],
|
|
provider_factory=factory,
|
|
)
|
|
|
|
result = await fb.chat(messages=[{"role": "user", "content": "hi"}])
|
|
assert result.content == "b ok"
|
|
assert factory.call_count == 2
|
|
factory.assert_any_call("fallback-a")
|
|
factory.assert_any_call("fallback-b")
|
|
|
|
|
|
class TestAllFallbacksFail:
|
|
@pytest.mark.asyncio
|
|
async def test(self) -> None:
|
|
primary = _FakeProvider("primary", _error_response("primary fail"))
|
|
fallback = _FakeProvider("fallback", _error_response("all fail"))
|
|
factory = MagicMock(return_value=fallback)
|
|
|
|
fb = FallbackProvider(
|
|
primary=primary,
|
|
fallback_models=["fallback-a"],
|
|
provider_factory=factory,
|
|
)
|
|
|
|
result = await fb.chat(messages=[{"role": "user", "content": "hi"}])
|
|
assert result.finish_reason == "error"
|
|
assert "all fail" in result.content
|
|
|
|
|
|
class TestFactoryExceptionSkipsModel:
|
|
@pytest.mark.asyncio
|
|
async def test(self) -> None:
|
|
primary = _FakeProvider("primary", _error_response())
|
|
fallback_b = _FakeProvider("b", _make_response("b ok"))
|
|
factory = MagicMock(side_effect=[ValueError("no key"), fallback_b])
|
|
|
|
fb = FallbackProvider(
|
|
primary=primary,
|
|
fallback_models=["fallback-a", "fallback-b"],
|
|
provider_factory=factory,
|
|
)
|
|
|
|
result = await fb.chat(messages=[{"role": "user", "content": "hi"}])
|
|
assert result.content == "b ok"
|
|
assert factory.call_count == 2
|
|
|
|
|
|
class TestFallbackModelParameter:
|
|
@pytest.mark.asyncio
|
|
async def test(self) -> None:
|
|
"""Fallback calls should use the fallback model name."""
|
|
primary = _FakeProvider("primary", _error_response())
|
|
fallback = _FakeProvider("fallback", _make_response("ok"))
|
|
factory = MagicMock(return_value=fallback)
|
|
|
|
fb = FallbackProvider(
|
|
primary=primary,
|
|
fallback_models=["fallback-model"],
|
|
provider_factory=factory,
|
|
)
|
|
|
|
await fb.chat(messages=[{"role": "user", "content": "hi"}], model="primary-model")
|
|
assert fallback.chat_calls[0]["model"] == "fallback-model"
|
|
|
|
|
|
class TestNoFallbackWhenEmptyList:
|
|
@pytest.mark.asyncio
|
|
async def test(self) -> None:
|
|
primary = _FakeProvider("primary", _error_response())
|
|
factory = MagicMock()
|
|
|
|
fb = FallbackProvider(
|
|
primary=primary,
|
|
fallback_models=[],
|
|
provider_factory=factory,
|
|
)
|
|
|
|
result = await fb.chat(messages=[{"role": "user", "content": "hi"}])
|
|
assert result.finish_reason == "error"
|
|
factory.assert_not_called()
|
|
|
|
|
|
class TestChatStreamFailover:
|
|
@pytest.mark.asyncio
|
|
async def test_fallback_succeeds(self) -> None:
|
|
# Use empty content so on_content_delta is not triggered on the error
|
|
primary = _FakeProvider("primary", _error_response(""))
|
|
fallback = _FakeProvider("fallback", _make_response("stream ok"))
|
|
factory = MagicMock(return_value=fallback)
|
|
|
|
fb = FallbackProvider(
|
|
primary=primary,
|
|
fallback_models=["fallback-a"],
|
|
provider_factory=factory,
|
|
)
|
|
|
|
result = await fb.chat_stream(messages=[{"role": "user", "content": "hi"}])
|
|
assert result.content == "stream ok"
|
|
assert result.finish_reason == "stop"
|
|
|
|
|
|
class TestGetDefaultModel:
|
|
def test(self) -> None:
|
|
primary = _FakeProvider("primary")
|
|
fb = FallbackProvider(
|
|
primary=primary,
|
|
fallback_models=["a"],
|
|
provider_factory=MagicMock(),
|
|
)
|
|
assert fb.get_default_model() == "primary/model"
|
|
|
|
|
|
class TestCircuitBreaker:
|
|
@pytest.mark.asyncio
|
|
async def test_skips_primary_after_three_failures(self) -> None:
|
|
primary = _FakeProvider("primary", _error_response())
|
|
fallback = _FakeProvider("fallback", _make_response("fallback ok"))
|
|
factory = MagicMock(return_value=fallback)
|
|
fb = FallbackProvider(
|
|
primary=primary,
|
|
fallback_models=["fallback-a"],
|
|
provider_factory=factory,
|
|
)
|
|
|
|
# 3 failures — primary should still be called each time
|
|
for _ in range(3):
|
|
result = await fb.chat(messages=[{"role": "user", "content": "hi"}])
|
|
assert result.content == "fallback ok"
|
|
|
|
assert len(primary.chat_calls) == 3
|
|
|
|
# 4th call — primary circuit is open, should be skipped
|
|
primary.chat_calls.clear()
|
|
result = await fb.chat(messages=[{"role": "user", "content": "hi"}])
|
|
assert result.content == "fallback ok"
|
|
assert len(primary.chat_calls) == 0
|
|
|
|
@pytest.mark.asyncio
|
|
async def test_resets_on_success(self) -> None:
|
|
primary = _FakeProvider("primary", _error_response())
|
|
fallback = _FakeProvider("fallback", _make_response("fallback ok"))
|
|
factory = MagicMock(return_value=fallback)
|
|
fb = FallbackProvider(
|
|
primary=primary,
|
|
fallback_models=["fallback-a"],
|
|
provider_factory=factory,
|
|
)
|
|
|
|
# 2 failures
|
|
for _ in range(2):
|
|
await fb.chat(messages=[{"role": "user", "content": "hi"}])
|
|
|
|
# 3rd call: primary succeeds — circuit resets
|
|
primary._response = _make_response("primary ok")
|
|
result = await fb.chat(messages=[{"role": "user", "content": "hi"}])
|
|
assert result.content == "primary ok"
|
|
|
|
# 4th call: primary fails again — should still be called (counter reset)
|
|
primary._response = _error_response()
|
|
primary.chat_calls.clear()
|
|
result = await fb.chat(messages=[{"role": "user", "content": "hi"}])
|
|
assert result.content == "fallback ok"
|
|
assert len(primary.chat_calls) == 1
|
|
|
|
|
|
class TestGenerationForwarded:
|
|
def test(self) -> None:
|
|
from nanobot.providers.base import GenerationSettings
|
|
primary = _FakeProvider("primary")
|
|
primary.generation = GenerationSettings(temperature=0.5, max_tokens=1024)
|
|
fb = FallbackProvider(
|
|
primary=primary,
|
|
fallback_models=["a"],
|
|
provider_factory=MagicMock(),
|
|
)
|
|
assert fb.generation.temperature == 0.5
|
|
assert fb.generation.max_tokens == 1024
|