⚡ Optimize JSON serialization in simple_seismic_server.py

[Igor Holt (igor-holt)]

💡 What:

• Updated json.dumps() in send_json to use separators=(',', ':') instead of indent=2.
• Extracted the static response for the root endpoint (/) into a module-level pre-serialized byte string (STATIC_ROOT_RESPONSE).
• Modified send_json to natively accept and write bytes objects, bypassing serialization entirely for static data.

🎯 Why:
The previous implementation used indent=2, which inflated the JSON size and consumed extra CPU cycles for formatting. For production APIs, compact JSON is preferable. Further, the root endpoint returned a static dictionary on every request, wasting resources on redundant dictionary allocations and json.dumps encoding. By pre-serializing this data, we eliminate the serialization overhead entirely.

📊 Measured Improvement:

• Baseline (Root Endpoint): ~1110 Requests Per Second (RPS)
• Optimized (Root Endpoint): ~1174 Requests Per Second (RPS)
• Change: +5.7% overall throughput increase for the root endpoint on a 4-thread / 2000 request local benchmark. Micro-benchmarks of just the serialization step showed a reduction in processing time from ~4.72 seconds (indented) to ~0.69 seconds (compact) for 100k iterations (an 85% speedup in the serialization step alone).

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PR created automatically by Jules for task 6598495719364990152 started by Igor Holt (@igor-holt)

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[gemini-code-assist]

Code Review

This pull request introduces pre-serialized static responses and updates the send_json method to handle both raw data and bytes. Feedback suggests adding a Content-Length header to support persistent connections and moving serialization before sending headers to improve error handling.

[gemini-code-assist]

The send_json method is missing the Content-Length header. In a performance-oriented server, providing Content-Length is crucial as it allows clients to use HTTP persistent connections (Keep-Alive), which significantly increases throughput by avoiding the overhead of establishing a new connection for every request.

Additionally, serializing the JSON after calling end_headers() (line 117) is problematic for error handling. If json.dumps fails (e.g., due to a non-serializable object), the server will have already sent a 200 OK status and headers, resulting in a malformed response. It is recommended to serialize the data first, determine its length to set the Content-Length header, and then call end_headers().

        if not isinstance(data, bytes):
            data = json.dumps(data, separators=(',', ':')).encode('utf-8')
        self.wfile.write(data)

[genesis-code-assist]

Code Review

This pull request introduces pre-serialized static responses and updates the send_json method to handle byte-encoded data, reducing serialization overhead for common endpoints. The review feedback highlights an opportunity to further improve the send_json method by including a Content-Length header, which is necessary for supporting persistent HTTP connections (Keep-Alive).

[genesis-code-assist]

While the optimization to bypass serialization for bytes is beneficial, the send_json method still lacks a Content-Length header. Without this header, the server cannot support persistent HTTP connections (Keep-Alive) effectively, as the client cannot determine the end of the response body without closing the connection. Since this PR focuses on performance and production-readiness, adding this header is highly recommended. You can achieve this by ensuring the data is serialized into bytes before sending the headers.