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use error::*; use serde_json; const CRLF: &'static str = "\r\n"; const STRING_PREFIX: &'static str = "+"; const INT_PREFIX: &'static str = ":"; const JSON_PERFIX: &'static str = "?"; macro_rules! serialize_template { () => ("{prefix}{value}{crlf}") } #[derive(Debug, Clone, PartialEq)] pub enum Data { String(String), Int(i64), JSON(serde_json::Value), } impl Data { pub fn into_string(self) -> String { match self { Data::String(string) => Self::serialize_string(string), Data::Int(int) => Self::serialize_int(int), Data::JSON(json) => Self::serialize_json(json), } } pub fn try_from(string: String) -> Result<Data> { if string.len() < 2 || !string.ends_with(CRLF) { return Err(Error::new(ErrorKind::InvalidSerializedString)); } if string.starts_with(STRING_PREFIX) { Ok(Self::from_string(string)?) } else if string.starts_with(INT_PREFIX) { Ok(Self::from_int(string)?) } else if string.starts_with(JSON_PERFIX) { Ok(Self::from_json(string)?) } else { Err(Error::new(ErrorKind::InvalidSerializedString)) } } fn from_string(s: String) -> Result<Data> { Ok(Data::String(String::from(&s[1..s.len() - 2]))) } fn from_int(s: String) -> Result<Data> { Ok(Data::Int(s[1..s.len() - 2].parse::<i64>()?)) } fn from_json(s: String) -> Result<Data> { Ok(Data::JSON(serde_json::from_str(&s[1..s.len() - 2])?)) } fn serialize_string(s: String) -> String { format!(serialize_template!(), prefix = STRING_PREFIX, value = s, crlf = CRLF) } fn serialize_int(i: i64) -> String { format!(serialize_template!(), prefix = INT_PREFIX, value = i, crlf = CRLF) } fn serialize_json(json: serde_json::Value) -> String { format!(serialize_template!(), prefix = JSON_PERFIX, value = json.to_string(), crlf = CRLF) } } #[cfg(test)] mod tests { use super::*; #[test] fn test_from_string() { assert_eq!(Data::String(String::from("test_\r\nfrom_string")), Data::from_string(String::from("+test_\r\nfrom_string\r\n")).unwrap()); } #[test] fn test_from_int() { assert_eq!(Data::Int(22), Data::from_int(String::from(":22\r\n")).unwrap()); } #[test] fn test_from_invalid_int() { assert!(Data::from_int(String::from(":22invalid888\r\n")).is_err()); } #[test] fn test_serialize_string() { assert_eq!("+test\r\n_serialize\r\n_string\r\n", Data::serialize_string(String::from("test\r\n_serialize\r\n_string"))); } #[test] fn test_serialize_int() { assert_eq!(":666\r\n", Data::serialize_int(666)); } #[test] fn test_serialize_json() { assert_eq!("?{\"age\":18,\"name\":\"David\"}\r\n", Data::serialize_json(json!({"name": "David","age": 18}))); } #[test] fn test_serializble_into() { assert_eq!("+666\r\n", Data::String(String::from("666")).into_string()); assert_eq!(":666\r\n", Data::Int(666).into_string()); } #[test] fn test_try_from_invalid() { assert!(Data::try_from(String::from("")).is_err()); assert!(Data::try_from(String::from("\r\n")).is_err()); assert!(Data::try_from(String::from("11111")).is_err()); } #[test] fn test_try_from_string() { assert_eq!(Data::String(String::from("666")), Data::try_from(String::from("+666\r\n")).unwrap()); } #[test] fn test_try_from_int() { assert_eq!(Data::Int(666), Data::try_from(String::from(":666\r\n")).unwrap()); } #[test] fn test_try_from_json() { assert_eq!(Data::JSON(json!({"name": "David","age": 18})), Data::try_from(String::from("?{\"age\":18,\"name\":\"David\"}\r\n")).unwrap()); } }