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| use anyhow::Result; | |
| use redis::Commands; | |
| use serde::{Deserialize, Serialize}; | |
| use std::fmt; | |
| use std::fmt::Formatter; | |
| use std::str::FromStr; | |
| const COORDINATE_PRECISION: usize = 4; | |
| const CACHE_TTL: usize = 2628000; | |
| #[derive(Debug, Default, Serialize, Deserialize)] | |
| struct Address { | |
| street: Option<String>, | |
| street_number: Option<String>, | |
| postal_code: Option<String>, | |
| city: Option<String>, | |
| country: Option<String>, | |
| venue_name: Option<String>, | |
| formatted_address: Option<String>, | |
| } | |
| #[derive(strum_macros::EnumString, strum_macros::Display)] | |
| enum Locale { | |
| #[strum(serialize = "de-DE")] | |
| DeDe, | |
| #[strum(serialize = "en-GB")] | |
| EnGb, | |
| #[strum(serialize = "en-US")] | |
| EnUs, | |
| #[strum(serialize = "fr-FR")] | |
| FrFr, | |
| } | |
| impl Default for Locale { | |
| fn default() -> Self { | |
| Self::DeDe | |
| } | |
| } | |
| struct Latitude(f64); | |
| struct Longitude(f64); | |
| struct AddressKey { | |
| lat: Latitude, | |
| lng: Longitude, | |
| locale: Locale, | |
| } | |
| impl fmt::Display for AddressKey { | |
| fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result { | |
| write!( | |
| f, | |
| "{:.COORDINATE_PRECISION$},{:.COORDINATE_PRECISION$},{},opencage", | |
| self.lat.0, self.lng.0, self.locale | |
| ) | |
| } | |
| } | |
| trait AddressCache { | |
| fn get(&mut self, key: &AddressKey) -> Result<Option<Address>>; | |
| fn store(&mut self, key: &AddressKey, address: Address) -> Result<()>; | |
| fn remove(&mut self, key: &AddressKey) -> Result<()>; | |
| } | |
| struct RedisCache { | |
| conn: redis::Connection, | |
| } | |
| impl RedisCache { | |
| fn new(address: &str) -> Result<Self> { | |
| let client = redis::Client::open(address)?; | |
| let connection = client.get_connection()?; | |
| Ok(Self { conn: connection }) | |
| } | |
| } | |
| impl AddressCache for RedisCache { | |
| fn get(&mut self, key: &AddressKey) -> Result<Option<Address>> { | |
| let result: Option<String> = self.conn.get(key.to_string())?; | |
| Ok(result.map(|addr| serde_json::from_str::<Address>(&addr).unwrap())) | |
| } | |
| fn store(&mut self, key: &AddressKey, address: Address) -> Result<()> { | |
| self.conn.set_ex( | |
| key.to_string(), | |
| serde_json::to_string(&address).unwrap(), | |
| CACHE_TTL, | |
| )?; | |
| Ok(()) | |
| } | |
| fn remove(&mut self, key: &AddressKey) -> Result<()> { | |
| self.conn.del(key.to_string())?; | |
| Ok(()) | |
| } | |
| } | |
| fn main() -> Result<()> { | |
| // Output: | |
| // de-DE | |
| // 53.4970,10.0998,de-DE,opencage | |
| // { | |
| // "street": "Street", | |
| // "street_number": null, | |
| // "postal_code": null, | |
| // "city": null, | |
| // "country": null, | |
| // "venue_name": null, | |
| // "formatted_address": null | |
| // } | |
| // None | |
| let locale = Locale::from_str("un-KN").unwrap_or_default(); | |
| let key = AddressKey { | |
| lat: Latitude(53.49703), | |
| lng: Longitude(10.09985), | |
| locale: Default::default(), | |
| }; | |
| let address = Address { | |
| street: Some(String::from_str("Street")?), | |
| ..Default::default() | |
| }; | |
| let mut cache = RedisCache::new("redis://localhost:6379/2")?; | |
| println!("{}", locale); | |
| println!("{}", key); | |
| cache.store(&key, address)?; | |
| let address_from_cache = cache.get(&key); | |
| println!( | |
| "{}", | |
| serde_json::to_string_pretty(&address_from_cache?.unwrap_or(Address::default()))? | |
| ); | |
| cache.remove(&key)?; | |
| println!("{:?}", cache.get(&key)?); | |
| Ok(()) | |
| } |
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