aws-sdk-rust 0.1.0

/*
 Copyright 2016 LambdaStack All rights reserved.

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
*/

//! AWS Regions and helper functions.
//!
//! Mostly used for translating the Region enum to a string AWS accepts.
//!
//! For example: `UsEast1` to "us-east-1"

use std::error::Error;
use std::str::FromStr;
use std::fmt::{Display, Error as FmtError, Formatter};

/// An AWS region.
/// CnNorth1 is currently untested due to Rusoto maintainers not having access to AWS China.
#[derive(Copy, Clone, Debug, PartialEq)]
pub enum Region {
    ApNortheast1,
    ApNortheast2,
    ApSouth1,
    ApSoutheast1,
    ApSoutheast2,
    EuCentral1,
    EuWest1,
    SaEast1,
    UsEast1,
    UsWest1,
    UsWest2,
    CnNorth1,
}

/// An error produced when attempting to convert a `str` into a `Region` fails.
#[derive(Debug,PartialEq)]
pub struct ParseRegionError {
    message: String,
}

impl Display for Region {
    fn fmt(&self, f: &mut Formatter) -> Result<(), FmtError> {
        let region_str = match *self {
            Region::ApNortheast1 => "ap-northeast-1",
            Region::ApNortheast2 => "ap-northeast-2",
            Region::ApSouth1 => "ap-south-1",
            Region::ApSoutheast1 => "ap-southeast-1",
            Region::ApSoutheast2 => "ap-southeast-2",
            Region::EuCentral1 => "eu-central-1",
            Region::EuWest1 => "eu-west-1",
            Region::SaEast1 => "sa-east-1",
            Region::UsEast1 => "us-east-1",
            Region::UsWest1 => "us-west-1",
            Region::UsWest2 => "us-west-2",
            Region::CnNorth1 => "cn-north-1",
        };

        write!(f, "{}", region_str)
    }
}

impl FromStr for Region {
    type Err = ParseRegionError;

    fn from_str(s: &str) -> Result<Region, ParseRegionError> {
        match s {
            "ap-northeast-1" => Ok(Region::ApNortheast1),
            "ap-northeast-2" => Ok(Region::ApNortheast2),
            "ap-south-1" => Ok(Region::ApSouth1),
            "ap-southeast-1" => Ok(Region::ApSoutheast1),
            "ap-southeast-2" => Ok(Region::ApSoutheast2),
            "eu-central-1" => Ok(Region::EuCentral1),
            "eu-west-1" => Ok(Region::EuWest1),
            "sa-east-1" => Ok(Region::SaEast1),
            "us-east-1" => Ok(Region::UsEast1),
            "us-west-1" => Ok(Region::UsWest1),
            "us-west-2" => Ok(Region::UsWest2),
            "cn-north-1" => Ok(Region::CnNorth1),
            s => Err(ParseRegionError::new(s))
        }
    }
}

impl ParseRegionError {
    pub fn new(input: &str) -> Self {
        ParseRegionError {
            message: format!("Not a valid AWS region: {}", input)
        }
    }
}

impl Error for ParseRegionError {
    fn description(&self) -> &str {
        &self.message
    }
}

impl Display for ParseRegionError {
    fn fmt(&self, f: &mut Formatter) -> Result<(), FmtError> {
        write!(f, "{}", self.message)
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn from_str() {
        assert_eq!(
            "foo".parse::<Region>().err().expect(
                "Parsing foo as a Region was not an error"
            ).to_string(),
            "Not a valid AWS region: foo".to_owned()
        );
        assert_eq!("ap-northeast-1".parse(), Ok(Region::ApNortheast1));
        assert_eq!("ap-northeast-2".parse(), Ok(Region::ApNortheast2));
        assert_eq!("ap-south-1".parse(), Ok(Region::ApSouth1));
        assert_eq!("ap-southeast-1".parse(), Ok(Region::ApSoutheast1));
        assert_eq!("ap-southeast-2".parse(), Ok(Region::ApSoutheast2));
        assert_eq!("eu-central-1".parse(), Ok(Region::EuCentral1));
        assert_eq!("eu-west-1".parse(), Ok(Region::EuWest1));
        assert_eq!("sa-east-1".parse(), Ok(Region::SaEast1));
        assert_eq!("us-east-1".parse(), Ok(Region::UsEast1));
        assert_eq!("us-west-1".parse(), Ok(Region::UsWest1));
        assert_eq!("us-west-2".parse(), Ok(Region::UsWest2));
        assert_eq!("cn-north-1".parse(), Ok(Region::CnNorth1));
    }

    #[test]
    fn region_display() {
        assert_eq!(Region::ApNortheast1.to_string(), "ap-northeast-1".to_owned());
        assert_eq!(Region::ApNortheast2.to_string(), "ap-northeast-2".to_owned());
        assert_eq!(Region::ApSouth1.to_string(), "ap-south-1".to_owned());
        assert_eq!(Region::ApSoutheast1.to_string(), "ap-southeast-1".to_owned());
        assert_eq!(Region::ApSoutheast2.to_string(), "ap-southeast-2".to_owned());
        assert_eq!(Region::EuCentral1.to_string(), "eu-central-1".to_owned());
        assert_eq!(Region::EuWest1.to_string(), "eu-west-1".to_owned());
        assert_eq!(Region::SaEast1.to_string(), "sa-east-1".to_owned());
        assert_eq!(Region::UsEast1.to_string(), "us-east-1".to_owned());
        assert_eq!(Region::UsWest1.to_string(), "us-west-1".to_owned());
        assert_eq!(Region::UsWest2.to_string(), "us-west-2".to_owned());
        assert_eq!(Region::CnNorth1.to_string(), "cn-north-1".to_owned());
    }
}