Fluence Rust sdk - version 1

[RicoGit]

Motivation

Passing complex data to WebAssembly requires its allocation in VM’s memory. Then a pointer to that data is passed to the called function instead. The same holds for the reverse case: the VM returns a pointer, then we can pick the bytes from memory. That creates a necessity to convert complex types (string, byte) into integers (pointers) before a function could pass them to VM or read data from memory. This logic is very general and it is the same for many Rust applications. Our proposal is to bundle them together and provide as a dependency in an SDK. This will also simplify using the Fluence network for developers.

Proposition

Create the first version of Fluence SDK for Rust that consists of:

• Allocate and deallocate methods for external memory management.
• Methods for reading from and writing to raw memory for UTF strings.

All of this functions will be used frequently and must be well tested.

Also, the SDK has to publish to crates.io.

This task is a continuation of (#163).

[RicoGit]

done