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Hyperledger Iroha 2 supports several client SDK libraries, such as Java SDK, Javascript SDK or Python SDK. The way this works currently is by exporting language agnostic schema file that describes all structures exchanged between server (written in Rust) and the client (written in the language of choice - Java, Javascript, Python). SDK developers then build their respective libraries with some automated process of code generation out of the schema. Often times changes in the schema are such that they require manual intervention in the transcription process but if nothing else it is required by every SDK to build and maintain the code for code generation out of schema. To solve this problems for all SDKs in once place it has been decided to generate a shared object that exposes `extern` extern functions SDK client libraries can link against dynamically

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1. cbindgen(git@github.com:mozilla/cbindgen.git),
2. iroha2(git@github.com:hyperledger/iroha.git) branch: iroha2-stable
3. iroha2-java(git@github.com:hyperledger/iroha-java.git)

Milestones

Eval 1:

•  Add the functionality to parse function signatures with associated types out of MIR to cbindgen (either by itself or in addition to Rust source code)
•  Write tests that will cover the functionality of parsing associated types in cbindgen
•  Open a PR to merge this code into cbindgen, progress with further tasks as we wait for this to be approved

Eval 2:

•  Use iroha_ffi to generate extern functions out of existing Rust code
•  Make corrections to the iroha_ffi library in this process if needed or write manual implementations of extern functions

Eval 3:

•  Use cbindgen to generate C .h header files out of extern functions in the Rust source code
•  Conduct manual testing
•  Address the code bugs

Eval 43:

•  Document the mentorship results
•  Create a small app demonstrating that you have successfully linked the shared object with the C header files
•  Present your results

Timeline

Mentors

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Merged PRs

• PR to cbindgen