Draft: #7 alternative kv db

src/db2.rs

+extern crate redis;
+use log::info;
+use redis::Commands;
+use redis::FromRedisValue;
+use redis::RedisError;
+use redis::RedisResult;
+use redis::ToRedisArgs;
+use serde_json as json;
+use std::path::PathBuf;
+
+use crate::db::Domain;
+use crate::sha256;
+
+pub struct Database {
+    conn: redis::Connection,
+}
+
+impl Database {
+    pub fn new(path: PathBuf) -> Result<Self, RedisError> {
+        let client = redis::Client::open("redis://127.0.0.1/")?; // TODO extract path
+        let c = client.get_connection()?;
+        Ok(Database { conn: c }) // TODO Error handling
+    }
+
+    pub fn insert_new_domain(&mut self, d: &Domain) {
+        let value = json::to_vec(&d).unwrap();
+        let key = sha256!(&d.domainname);
+        let _ : () = self.conn.set::<String,  Vec<u8>, _>(key, value).unwrap();  // TODO Error handling
+    }
+
+    pub fn get_domain(&mut self, domain: &String) -> Option<Domain> {
+        let r: Vec<u8> = self.conn.get::<String, Vec<u8>>(sha256!(domain)).unwrap(); // TODO  Error handling
+        json::from_slice(&r).unwrap()
+    }
+}
+
+#[test]
+fn it_saves_domain() {
+    let mut db = Database::new(PathBuf::from("redis://127.0.0.1")).unwrap();
+    let mut d = Domain::new(String::from("kaputt.cloud"));
+    db.insert_new_domain(&mut d);
+    let res = db.get_domain(&String::from("kaputt.cloud")).unwrap();
+    assert_eq!(d.token, res.token);
+}