33488fd634
Backend: - FastAPI WebSocket /ws endpoint with streaming via LangGraph astream - LangGraph Supervisor connecting 3 mock agents (order_lookup, order_actions, fallback) - YAML Agent Registry with Pydantic validation and immutable configs - PostgresSaver checkpoint persistence via langgraph-checkpoint-postgres - Session TTL with 30-min sliding window and interrupt extension - LLM provider abstraction (Anthropic/OpenAI/Google) - Token usage + cost tracking callback handler - Input validation: message size cap, thread_id format, content length - Security: no hardcoded defaults, startup API key validation, no input reflection Frontend: - React 19 + TypeScript + Vite chat UI - WebSocket hook with reconnect + exponential backoff - Streaming token display with agent attribution - Interrupt approval/reject UI for write operations - Collapsible tool call viewer Testing: - 87 unit tests, 87% coverage (exceeds 80% requirement) - Ruff lint + format clean Infrastructure: - Docker Compose (PostgreSQL 16 + backend) - pyproject.toml with full dependency management
43 lines
1.1 KiB
Python
43 lines
1.1 KiB
Python
"""LLM provider factory with prompt caching support."""
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from __future__ import annotations
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from typing import TYPE_CHECKING
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if TYPE_CHECKING:
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from langchain_core.language_models import BaseChatModel
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from app.config import Settings
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def create_llm(settings: Settings) -> BaseChatModel:
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"""Create an LLM instance based on the configured provider."""
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provider = settings.llm_provider
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model = settings.llm_model
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if provider == "anthropic":
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from langchain_anthropic import ChatAnthropic
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return ChatAnthropic(
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model=model,
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api_key=settings.anthropic_api_key,
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)
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if provider == "openai":
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from langchain_openai import ChatOpenAI
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return ChatOpenAI(
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model=model,
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api_key=settings.openai_api_key,
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)
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if provider == "google":
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from langchain_google_genai import ChatGoogleGenerativeAI
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return ChatGoogleGenerativeAI(
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model=model,
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google_api_key=settings.google_api_key,
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)
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raise ValueError(f"Unknown LLM provider: '{provider}'. Use 'anthropic', 'openai', or 'google'.")
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