hexagonal-rust

Purpose

This POC is an attempt at using an hexagonal architecture in a Rust codebase while learning the language.

Pros:

• The domain and business logic are isolated from any infrastructure code thanks to multiple rust sub-projects;
• Domain is easily testable;
• It is possible to implement various secondary adapters as long as it complies with the domain port. As an example, the InMemoryComicRepository may be easily replaced by another adapter with a database implementation. This will have no impact on the domain and business rules.

Cons:

• This is probably not the idiomatic way for a Rust project since this is quite OOP oriented.
• A lot of improvements may be done. For instance, avoiding to box ports in the domain.

This application starts an actix web server. A struct named WebState is provided as a state_factory to be used in routes. This struct does not know which implementation of the ports are used.

Hexagonal implementation

Run in development or production mode

Purpose was just to showcase the use of various config files:

• Start the web server in development mode: cargo run

• Start the web server in production mode: RUN_MODE=production cargo run

Behind the scenes, this will only swap the "debug" flag. This was simply to simulate various settings environments.

Example: (note the debug: Ok(true))

🚀 cargo run                    
    Finished dev [unoptimized + debuginfo] target(s) in 0.22s
     Running `target/debug/hexagonal-rust`
debug: Ok(true) 
web: Ok(Web { port: 9090 })

Some simple valid queries

Let's find a comic book thanks to its upc (1234 and 4567 are available).

Examples:

curl http://127.0.0.1:9090/comics/1234

🚀 curl http://127.0.0.1:9090/comics/1234 -v
*   Trying 127.0.0.1:9090...
* Connected to 127.0.0.1 (127.0.0.1) port 9090 (#0)
> GET /comics/1234 HTTP/1.1
> Host: 127.0.0.1:9090
> User-Agent: curl/7.75.0
> Accept: */*
> 
* Mark bundle as not supporting multiuse
< HTTP/1.1 200 OK
< content-length: 62
< content-type: application/json
< date: Thu, 11 Mar 2021 12:44:04 GMT
< 
* Connection #0 to host 127.0.0.1 left intact
{"upc":"1234","title":"batman#1","description":"joker war #1"}

curl http://127.0.0.1:9090/comics/7777

🚀 curl http://127.0.0.1:9090/comics/7777 -v
*   Trying 127.0.0.1:9090...
* Connected to 127.0.0.1 (127.0.0.1) port 9090 (#0)
> GET /comics/7777 HTTP/1.1
> Host: 127.0.0.1:9090
> User-Agent: curl/7.75.0
> Accept: */*
> 
* Mark bundle as not supporting multiuse
< HTTP/1.1 404 Not Found
< content-length: 0
< date: Thu, 11 Mar 2021 12:46:46 GMT
< 
* Connection #0 to host 127.0.0.1 left intact