feat: add openai-compatible model gateway

backend/apps/modelhub/tests/test_services.py

@@ -0,0 +1,59 @@
+from openai import APITimeoutError
+
+from apps.modelhub.crypto import encrypt_secret
+from apps.modelhub.models import ModelDeployment, ModelInvocation, ModelProvider
+from apps.modelhub.services import CompletionResult, execute_invocation
+
+
+def create_invocation():
+    provider = ModelProvider.objects.create(
+        name="模型渠道",
+        base_url="https://models.example.com/v1",
+        api_key_encrypted=encrypt_secret("secret"),
+    )
+    deployment = ModelDeployment.objects.create(
+        provider=provider,
+        display_name="支持模型",
+        model_name="support-model",
+    )
+    return ModelInvocation.objects.create(
+        deployment=deployment,
+        input_snapshot={"messages": [{"role": "user", "content": "hello"}]},
+    )
+
+
+def test_transient_error_retries_once(db, monkeypatch):
+    invocation = create_invocation()
+    calls = []
+
+    def request(*args, **kwargs):
+        calls.append(1)
+        if len(calls) == 1:
+            raise APITimeoutError(request=None)
+        return CompletionResult("ok", 3, 1)
+
+    monkeypatch.setattr("apps.modelhub.services._request_completion", request)
+    monkeypatch.setattr("apps.modelhub.services.sleep", lambda *_: None)
+
+    execute_invocation(invocation, invocation.input_snapshot["messages"])
+
+    invocation.refresh_from_db()
+    assert len(calls) == 2
+    assert invocation.status == "succeeded"
+    assert invocation.retry_count == 1
+
+
+def test_non_transient_error_fails_without_exposing_raw_error(db, monkeypatch):
+    invocation = create_invocation()
+
+    def request(*args, **kwargs):
+        raise ValueError("secret provider detail")
+
+    monkeypatch.setattr("apps.modelhub.services._request_completion", request)
+
+    execute_invocation(invocation, invocation.input_snapshot["messages"])
+
+    invocation.refresh_from_db()
+    assert invocation.status == "failed"
+    assert invocation.error_code == "unexpected_error"
+    assert "secret provider detail" not in invocation.error_message