Rust | Snippets on Bas-Man's Musings

Adding feature required Tag to Rust Documentation

Sat, 13 Nov 2021 14:00:00 +0900

I had a lot of trouble understanding this. Thus I am documenting it here for myself. All credit goes to the original StackOverFlow author.

Add one of the following to the root of your crate. Usually lib.rs
1.
```
#![feature(doc_cfg)]
```
This is less than ideal as it will cause compile errors when used with stable
2. It is better to use:
```
#![cfg_attr(docsrs, feature(doc_cfg))]
```
This allows this to be conditionally compiled and does not give any errors.

Auto convert one error to another

Sun, 07 Nov 2021 12:30:00 +0900

Automatically convert one error to another.

Display Trait

Sun, 07 Nov 2021 12:30:00 +0900

Define a display trait for a struct or enum

impl std::fmt::Display for MechanismError {
 fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
 match self {
 MechanismError::NotValidMechanismFormat(mesg) => {
 write!(f, "{} does not conform to any Mechanism format.", mesg)
 }
 MechanismError::NotIP4Network(mesg) => {
 write!(f, "Was given ip4:{}. This is not an ip4 network.", mesg)
 }
 MechanismError::NotIP6Network(mesg) => {
 write!(f, "Was given ip6:{}. This is not an ip6 network.", mesg)
 }
 MechanismError::NotValidIPNetwork(mesg) => {
 write!(f, "{}.", mesg)
 }
 MechanismError::NotIpNetworkMechanism => {
 write!(f, "Attempt to access TXT as IP.")
 }
 MechanismError::NotStringMechanism => {
 write!(f, "Attempt to access IP as TXT.")
 }
 }
 }
}

Reference:

How to to_string() in Rust

Enum to Encapulate Errors

Sun, 07 Nov 2021 12:30:00 +0900

Creating a enum to encapsulate Errors.

Using trust-dns-resolver to do mx lookups

Thu, 25 Mar 2021 16:30:00 +0900

Using trust-dns-resolver to do mx lookups

Using trust-dns-resolver to do soa lookups

Thu, 25 Mar 2021 16:30:00 +0900

Using trust-dns-resolver to do soa lookups