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  1. Async I/O - as Iroha2 is heavily async and relies on executors for low-level thread management.
  2. A relatively small number of new dependencies - as new dependencies introduce potential security risks.
  3. Library rather than framework - as Iroha2 has already a rather specific structure and should not change its style to fit the framework.
  4. It should be possible to upgrade HTTP connection from HTTP library with WebSocket
  5. Free open license
  6. HTTP 1.1 support - as Substrate offchain workers do not support HTTP 2

Proposed Libraries

The proposed libraries are the following:

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AlternativeDescriptionWhy not chosen
tiny_http as HTTP server libraryLow-level HTTP server libraryNo async support
hyper as HTTP server libraryA fast and correct HTTP implementation for Rust. Actually the fastest HTTP server library according to techempower.
  1. Has many dependencies and one of them is tokio which is not optional.
  2. No information on whether it will work with async-std as it is built with the use of tokio.
  3. Not possible to upgrade the HTTP connection with web socket.
h2 as HTTP server libraryA Tokio aware, HTTP/2.0 client & server implementation for Rust.
  1. It is not possible to use http 2.0 currently - see requirements.
  2. Depends on tokio - same concerns as with hyper.
http-service as HTTP server interface libraryThe crate http-service provides the necessary types and traits to implement your own HTTP Server.The crate mainly provides the interface for the servers to implement the same methods, it might be good for architecture in general, but it is an additional dependency and our priority is to only add absolutely necessary ones.
tide as http serverA modular web framework built around async/await.
  1. It is a framework, though less opinionated as others, it still imposes some limitations
  2. No WebSocket protocol upgrade is supported at the moment. But this feature seems to be under development.

In general it might have been a good choice if they had finished web socket support by now.

https://github.com/carllerche/h2Http 2.0 is not supported by the substratehttps://crates.io/crates/http-servicehttps://github.com/http-rs/tide

actix / warp / rocket as web frameworkPopular web frameworks with both warp and rocket being built on the hyper library,
  1. They are Web Frameworks and it is preferable to use a library.
  2. They have many dependencies, where most of them are not needed for our purposes.
Custom http and web socket librariesIt is possible to implement a fully custom solution.

There are already existing solutions which correctly implement the standards and are widely used.

The team will be able to focus on our unique functionality.

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