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API design & gRPC

REST best practices, protobuf, API versioning, and backward-compatible service contracts.

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How to Implement ETag Optimistic Concurrency in Python

Build a lightweight in-memory resource store that uses MD5 hash ETags to prevent lost updates via optimistic concurrency control.

etag concurrency hashing
Python 
import hashlib
import json

class ResourceStore:
    def __init__(self):
        self.data = {}
        self.etags = {}

    def get(self, resource_id):
        if resource_id not in self.data:
            return None, None
        return self.data[resource_id], self.etags[resource_id]

    def put(self, resource_id, …
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