Requests uses sqlite now

migrations/2024-03-03-220459_create_records/down.sql

@@ -0,0 +1,2 @@
+-- This file should undo anything in `up.sql`
+DROP TABLE records

migrations/2024-03-03-220459_create_records/up.sql

@@ -0,0 +1,11 @@
+-- Your SQL goes here
+CREATE TABLE records (
+  name TEXT NOT NULL,
+  type INT NOT NULL,
+  class INT NOT NULL,
+  ttl INT NOT NULL,
+  rdlength INT NOT NULL,
+  rdata BLOB NOT NULL,
+
+  PRIMARY KEY (name,type,class)
+)

src/db/lib.rs

@@ -0,0 +1,13 @@
+use diesel::prelude::*;
+use diesel::sqlite::SqliteConnection;
+use dotenvy::dotenv;
+use std::env;
+
+
+pub fn establish_connection() -> SqliteConnection {
+    dotenv().ok();
+
+    let database_url = env::var("DATABASE_URL").expect("DATABASE_URL must be set");
+    SqliteConnection::establish(&database_url)
+        .unwrap_or_else(|_| panic!("Error connecting to {}", database_url))
+}

src/db/mod.rs

@@ -0,0 +1,2 @@
+pub mod models;
+pub mod lib;

src/db/models.rs

@@ -0,0 +1,47 @@
+use self::schema::records;
+use diesel::prelude::*;
+
+mod schema {
+    diesel::table! {
+        records (name, _type, class) {
+            name -> Text,
+            #[sql_name = "type"]
+            _type -> Integer,
+            class -> Integer,
+            ttl -> Integer,
+            rdlength -> Integer,
+            rdata -> Binary,
+        }
+    }
+}
+
+#[derive(Insertable, Queryable, Selectable)]
+#[diesel(table_name = records)]
+pub struct Record {
+    pub name: String,
+    pub _type: i32,
+    pub class: i32,
+    pub ttl: i32,
+    pub rdlength: i32,
+    pub rdata: Vec<u8>,
+}
+
+impl Record {
+    pub fn get(
+        db: &mut SqliteConnection,
+        name: String,
+        _type: i32,
+        class: i32,
+    ) -> Result<Record, diesel::result::Error> {
+        records::table.find((name, _type, class)).get_result(db)
+    }
+
+    pub fn create(
+        db: &mut SqliteConnection,
+        new_record: Record,
+    ) -> Result<usize, diesel::result::Error> {
+        diesel::insert_into(records::table)
+            .values(&new_record)
+            .execute(db)
+    }
+}

src/errors.rs

@@ -22,3 +22,14 @@ impl fmt::Display for ParseError {
         write!(f, "Parse Error for {}: {}", self.object, self.message)
     }
 }
+
+#[derive(Debug)]
+pub struct DatabaseError {
+    pub message: String,
+}
+
+impl fmt::Display for DatabaseError {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        write!(f, "Database Error: {}", self.message)
+    }
+}

src/main.rs

@@ -1,11 +1,14 @@
 use std::{error::Error, net::SocketAddr, sync::Arc};
 
+use db::{lib::establish_connection, models::Record};
+use errors::DatabaseError;
 use parser::FromBytes;
-use structs::Message;
+use structs::{Message, Question};
 use tokio::net::UdpSocket;
 
 use crate::structs::{Class, Type, RR};
 
+mod db;
 mod errors;
 mod parser;
 mod structs;
@@ -13,28 +16,80 @@ mod worker;
 
 const MAX_DATAGRAM_SIZE: usize = 40_96;
 
-async fn create_query(message: Message) -> Message {
-    let mut response = message.clone();
-    let ip = String::from("93.184.216.34");
-    let rr = RR {
-        name: vec![String::from("example"), String::from("org")],
-        _type: Type::A,
-        class: Class::IN,
-        ttl: 4096,
-        rdlength: ip.len() as u16,
-        rdata: vec![1, 2, 3, 4],
+async fn get_from_database(question: Question) -> Result<RR, DatabaseError> {
+    let db_connection = &mut establish_connection();
+    let record = Record::get(
+        db_connection,
+        question.qname.join("."),
+        question.qtype as i32,
+        question.qclass as i32,
+    )
+    .map_err(|e| DatabaseError {
+        message: e.to_string(),
+    })?;
+
+    Ok(RR {
+        name: record.name.split(".").map(str::to_string).collect(),
+        _type: Type::try_from(record._type as u16).map_err(|e| DatabaseError { message: e })?,
+        class: Class::try_from(record.class as u16).map_err(|e| DatabaseError { message: e })?,
+        ttl: record.ttl,
+        rdlength: record.rdlength as u16,
+        rdata: record.rdata,
+    })
+}
+
+async fn insert_into_database(rr: RR) -> Result<(), DatabaseError> {
+    let db_connection = &mut establish_connection();
+    let record = Record {
+        name: rr.name.join("."),
+        _type: rr._type as i32,
+        class: rr.class as i32,
+        ttl: rr.ttl,
+        rdlength: rr.rdlength as i32,
+        rdata: rr.rdata,
     };
 
-    response.header.flags |= 0b1000010110000000;
-    response.header.ancount = 1;
-    response.header.arcount = 0;
-    response.answer = Some(rr);
+    Record::create(db_connection, record).map_err(|e| DatabaseError {
+        message: e.to_string(),
+    })?;
+
+    Ok(())
+}
+
+async fn create_query(message: Message) -> Message {
+    let mut response = message.clone();
+
+    let answer = get_from_database(message.question).await;
+
+    match answer {
+        Ok(rr) => {
+            response.header.flags |= 0b1000010110000000;
+            response.header.ancount = 1;
+            response.header.arcount = 0;
+            response.answer = Some(rr)
+        }
+        Err(e) => {
+            response.header.flags |= 0b1000010110000011;
+            eprintln!("{}", e);
+        }
+    }
 
     response
 }
 
 #[tokio::main]
 async fn main() -> Result<(), Box<dyn Error>> {
+    // insert_into_database(RR{
+    //     name: vec![String::from("example"),String::from("org")],
+    //     _type: Type::A,
+    //     class: Class::IN,
+    //     ttl: 100,
+    //     rdlength: 4,
+    //     rdata: vec![1,2,3,4]
+    // }).await;
+    //
+    // return Ok(());
+
     let local_addr: SocketAddr = "127.0.0.1:8080".parse()?;
 
     let socket_shared = Arc::new(UdpSocket::bind(local_addr).await?);

src/parser.rs

@@ -8,23 +8,23 @@ use crate::{
 type Result<T> = std::result::Result<T, ParseError>;
 
 impl TryFrom<u16> for Type {
-    type Error = (); //TODO: user better error
+    type Error = String; 
 
-    fn try_from(value: u16) -> std::result::Result<Self, ()> {
+    fn try_from(value: u16) -> std::result::Result<Self, String> {
         match value {
             x if x == Type::A as u16 => Ok(Type::A),
-            _ => Err(()),
+            _ => Err(format!("Invalid Type value: {}",value)),
         }
     }
 }
 
 impl TryFrom<u16> for Class {
-    type Error = (); //TODO: user better error
+    type Error = String; 
 
-    fn try_from(value: u16) -> std::result::Result<Self, ()> {
+    fn try_from(value: u16) -> std::result::Result<Self, String> {
         match value {
             x if x == Class::IN as u16 => Ok(Class::IN),
-            _ => Err(()),
+            _ => Err(format!("Invalid Class value: {}",value)),
         }
     }
 }

src/schema.rs

@@ -0,0 +1,13 @@
+// @generated automatically by Diesel CLI.
+
+diesel::table! {
+    records (name, type_, class) {
+        name -> Text,
+        #[sql_name = "type"]
+        type_ -> Integer,
+        class -> Integer,
+        ttl -> Integer,
+        rdlength -> Integer,
+        rdata -> Binary,
+    }
+}

src/structs.rs

@@ -2,6 +2,7 @@
 #[derive(Debug, Clone)]
 pub enum Type {
     A = 1,
+    AAAA = 28
 }
 
 #[repr(u16)]