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use serde::de; use serde::{Deserialize, Deserializer, Serialize, Serializer}; use std::fmt; use std::fmt::Display; #[derive(Clone, Debug, Eq, Hash, PartialEq)] pub struct Address { pub host: String, pub port: u16, } #[derive(Debug, Eq, PartialEq)] pub enum AddressError { InvalidFormat, InvalidPort, } impl Address { pub fn new(host: &str, port: u16) -> Address { Address { host: host.to_string(), port, } } pub fn parse(address: &str) -> Result<Address, AddressError> { let parts: Vec<&str> = address.split(':').collect(); if parts.len() == 2 { if let Ok(port) = parts[1].parse() { Ok(Address::new(parts[0], port)) } else { Err(AddressError::InvalidPort) } } else if parts.len() == 1 { Ok(Address::new(address, 22)) } else { Err(AddressError::InvalidFormat) } } pub fn parse_vec(addresses: &[String]) -> Result<Vec<Address>, AddressError> { let mut result = Vec::new(); for elem in addresses { match Address::parse(elem) { Ok(addr) => result.push(addr), Err(err) => return Err(err), } } Ok(result) } pub fn port_str(&self) -> String { self.port.to_string() } pub fn to_string(&self) -> String { format!("{}:{}", self.host, self.port) } } struct AddressVisitor; impl<'de> de::Visitor<'de> for AddressVisitor { type Value = Address; fn expecting(&self, formatter: &mut fmt::Formatter) -> fmt::Result { formatter.write_str("host[:port]") } fn visit_str<E>(self, value: &str) -> Result<Self::Value, E> where E: de::Error, { match Address::parse(value) { Ok(addr) => Ok(addr), Err(AddressError::InvalidFormat) => Err(E::custom("invalid address format")), Err(AddressError::InvalidPort) => Err(E::custom("invalid port number")), } } } impl<'de> Deserialize<'de> for Address { fn deserialize<D>(deserializer: D) -> Result<Address, D::Error> where D: Deserializer<'de>, { deserializer.deserialize_str(AddressVisitor) } } impl Serialize for Address { fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> where S: Serializer, { serializer.serialize_str(&self.to_string()) } } impl Display for Address { fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f, "{}:{}", self.host, self.port) } } #[cfg(test)] mod tests { use super::*; use serde_test::{assert_tokens, Token}; #[test] fn test_parse() { assert_eq!(Address::parse("a"), Ok(Address::new("a", 22))); assert_eq!(Address::parse("a:1234"), Ok(Address::new("a", 1234))); assert_eq!(Address::parse("a:b"), Err(AddressError::InvalidPort)); assert_eq!( Address::parse("a:1234:5678"), Err(AddressError::InvalidFormat) ); } #[test] fn test_parse_vec() { assert_eq!( Address::parse_vec(&["a".to_string(), "b:9222".to_string()]), Ok(vec![Address::new("a", 22), Address::new("b", 9222)]) ); assert_eq!( Address::parse_vec(&["a".to_string(), "b:abcd".to_string()]), Err(AddressError::InvalidPort) ); } #[test] fn test_to_string() { assert_eq!(Address::new("abc", 123).to_string(), "abc:123"); } #[test] fn test_display() { let addr = Address::new("abc", 22); assert_eq!(format!("{}", addr), "abc:22"); } #[test] fn test_ser_de() { let addr = Address::new("abc", 22); assert_tokens(&addr, &[Token::Str("abc:22")]); } }