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16 lines
1.1 KiB
TeX
16 lines
1.1 KiB
TeX
\section{Implementation}
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\label{sec:implementation}
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The gateway is implemented in Python using an asynchronous architecture built on \texttt{asyncio} and \texttt{httpx} for HTTP client operations. The server framework is FastAPI with Uvicorn workers. Key implementation details include:
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\begin{itemize}[leftmargin=*]
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\item \textbf{Concurrency model}: Fully asynchronous I/O with no blocking calls. Provider adapters use \texttt{httpx.AsyncClient} with connection pooling.
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\item \textbf{Configuration}: YAML-based configuration with environment variable overrides and hot-reload via file watching.
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\item \textbf{Database}: PostgreSQL for persistent state (audit logs, cost records, configuration). Redis for caching and real-time counters.
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\item \textbf{Deployment}: Single Docker image with configurable worker count. Supports horizontal scaling behind any L4/L7 load balancer.
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\end{itemize}
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The gateway comprises approximately 28,000 lines of Python code, with provider adapters accounting for 40\% of the codebase. Test coverage is 87\% with 1,200 unit tests and 340 integration tests.
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