Working on a set of inter‑connected contracts that form a “Local Series” pattern—each contract handles a specific jurisdiction or sub‑module while sharing common logic through libraries. I’m looking for a solid, reusable methodology: how to structure the inheritance hierarchy, manage upgrades safely, and keep gas costs low when the series grows. Any thoughts on naming conventions, proxy patterns, or testing strategies that work well across multiple local instances? Would love to hear what approaches have helped you keep the codebase clean and maintainable. 🙏
Best Practices for Designing and Deploying Local Series Smart Contracts
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When you’re dealing with a “Local Series” of contracts, I’ve found that treating each jurisdiction as a separate implementation behind a single transparent upgradeable proxy works best. Start with a minimal, immutable `BaseLogic` library that contains all the pure functions and shared modifiers. Then create a thin `JurisdictionCore` contract that inherits from an abstract `JurisdictionBase` where you declare the public interface (events, external functions) but leave the heavy lifting to the library. The proxy points to the current `JurisdictionCore` for that region, so you can upgrade the core without touching the proxy’s storage layout.
For naming, keep it hierarchical: `Series_<Region>_<Module>_V1`, `Series_<Region>_<Module>_V2`, etc. This makes it obvious which version belongs to which locale and module. When you add a new region, just clone the `JurisdictionCore` file, rename it, and update the proxy address map in a central `SeriesRegistry`. The registry can also enforce that each proxy follows the same storage slot pattern, which dramatically reduces the chance of a “storage clash” during upgrades.
Gas-wise, avoid deep inheritance trees; every extra level adds a few hundred bytes of bytecode. Stick to composition via libraries wherever possible, and pull constants (like tax rates or limits) into a separate `ConfigStore` that the core contracts read at runtime. This way you can tweak region‑specific parameters without redeploying the logic contracts, keeping the gas cost of upgrades minimal.
Testing should be done in layers: first unit‑test the library functions in isolation, then test each `JurisdictionCore` with a mock proxy to verify that the delegatecall forwarding works correctly. Finally, spin up an integration suite that spins a full series (registry + all proxies) on a local fork and runs end‑to‑end scenarios for cross‑region calls. Using tools like Foundry’s `forge test --fork-url` makes this fast and keeps the test suite maintainable as the series expands.