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_This PR is being continued from https://github.com/paritytech/polkadot-sdk/pull/2206, which was closed when the developer_hub was merged._ closes https://github.com/paritytech/polkadot-sdk-docs/issues/44 --- # Description This PR adds a reference document to the `developer-hub` crate (see https://github.com/paritytech/polkadot-sdk/pull/2102). This specific reference document covers defensive programming practices common within the context of developing a runtime with Substrate. In particular, this covers the following areas: - Default behavior of how Rust deals with numbers in general - How to deal with floating point numbers in runtime / fixed point arithmetic - How to deal with Integer overflows - General "safe math" / defensive programming practices for common pallet development scenarios - Defensive traits that exist within Substrate, i.e., `defensive_saturating_add `, `defensive_unwrap_or` - More general defensive programming examples (keep it concise) - Link to relevant examples where these practices are actually in production / being used - Unwrapping (or rather lack thereof) 101 todo -- - [x] Apply feedback from previous PR - [x] This may warrant a PR to append some of these docs to `sp_arithmetic` --------- Co-authored-by: Oliver Tale-Yazdi <oliver.tale-yazdi@parity.io> Co-authored-by: Gonçalo Pestana <g6pestana@gmail.com> Co-authored-by: Kian Paimani <5588131+kianenigma@users.noreply.github.com> Co-authored-by: Francisco Aguirre <franciscoaguirreperez@gmail.com> Co-authored-by: Radha <86818441+DrW3RK@users.noreply.github.com>
Substrate
Substrate is a next-generation framework for blockchain innovation 🚀.
Getting Started
Head to docs.substrate.io and follow the installation
instructions. Then try out one of the tutorials. Refer to the Docker
instructions to quickly run Substrate, Substrate Node Template, Subkey, or to build a chain spec.
Community & Support
Join the highly active and supportive community on the Substrate Stack Exchange to ask questions about use and problems you run into using this software. Please do report bugs and issues here for anything you suspect requires action in the source.
Contributions & Code of Conduct
Please follow the contributions guidelines as outlined in docs/contributor/CONTRIBUTING.md.
In all communications and contributions, this project follows the Contributor Covenant Code of Conduct.
Security
The security policy and procedures can be found in
docs/contributor/SECURITY.md.
License
- Substrate Primitives (
sp-*), Frame (frame-*) and the pallets (pallets-*), binaries (/bin) and all other utilities are licensed under Apache 2.0. - Substrate Client (/client/*/sc-*) is licensed under GPL v3.0 with a classpath linking exception.
The reason for the split-licensing is to ensure that for the vast majority of teams using Substrate to create feature-chains, then all changes can be made entirely in Apache2-licensed code, allowing teams full freedom over what and how they release and giving licensing clarity to commercial teams.
In the interests of the community, we require any deeper improvements made to Substrate's core logic (e.g. Substrate's internal consensus, crypto or database code) to be contributed back so everyone can benefit.