.gitignore

@@ -1,4 +1,4 @@
 /target
 **/*.rs.bk
-db.dat
+
-/db
+/db

Cargo.toml

@@ -13,8 +13,11 @@ readme = "README.md"
 rand="0.8"
 serde="1.0"
 serde_json="1.0"
+ledb = {git = "https://github.com/b4tman/ledb.git", rev="a646b90e", package="ledb"}
 rocket="0.4"
-chgk_ledb_lib = {git = "https://gitea.b4tman.ru/b4tman/chgk_ledb.git", rev="8120a996a3", package="chgk_ledb_lib"}
+chgk_ledb_lib = {git = "https://gitea.b4tman.ru/b4tman/chgk_ledb.git", rev="e521e39f5e", package="chgk_ledb_lib"}
+
+# lmdb-zero="0.4"
 
 [dependencies.rocket_contrib]
 version = "0.4"

src/main.rs

@@ -1,5 +1,6 @@
 #![feature(proc_macro_hygiene, decl_macro)]
 
+extern crate ledb;
 extern crate serde;
 extern crate serde_json;
 
@@ -15,13 +16,10 @@ use rocket_contrib::templates::Template;
 use rand::distributions::Uniform;
 use rand::Rng;
 
-use std::sync::Arc;
+use ledb::{Options, Storage};
 
-use chgk_ledb_lib::db;
 use chgk_ledb_lib::questions::Question;
 
-const DB_FILENAME: &str = "db.dat";
-
 trait ErrorEmpty {
     type Output;
     fn err_empty(self) -> Result<Self::Output, ()>;
@@ -34,37 +32,36 @@ impl<T, E> ErrorEmpty for Result<T, E> {
     }
 }
 
-type DataBaseInner = db::Reader<Question>;
+struct AppState {
-type DataBase = Arc<DataBaseInner>;
+    storage: Storage,
-struct AppState{
+    database_distribution: Uniform<u32>,
-    db: DataBase,
-    database_distribution: Uniform<usize>,
 }
 
-impl From<DataBaseInner> for AppState {
+fn get_database_distribution(storage: &Storage) -> Uniform<u32> {
-    fn from(db: DataBaseInner) -> Self {
+    let collection = storage
-        let last_id = db.len();
+        .collection("questions")
-        let database_distribution = rand::distributions::Uniform::new_inclusive(1usize, last_id);
+        .expect("collection \"questions\"");
-        let db = Arc::new(db);
+    let last_id = collection.last_id().expect("\"questions\" last_id");
 
-        Self {
+    rand::distributions::Uniform::new_inclusive(1u32, last_id)
-            db,
-            database_distribution
-        }
-    }
 }
 
-fn random_question_id(database_distribution: &Uniform<usize>) -> usize {
+fn random_question_id(database_distribution: &Uniform<u32>) -> u32 {
     let mut rng = rand::thread_rng();
     rng.sample(database_distribution)
 }
 
-fn get_question(db: &DataBase, id: usize) -> Result<Question, ()> {
+fn get_question(storage: &Storage, id: u32) -> Result<Question, ()> {
-    db.get(id - 1).err_empty()
+    storage
+        .collection("questions")
+        .err_empty()?
+        .get::<Question>(id)
+        .err_empty()?
+        .ok_or(())
 }
 
-fn show_question_details(template_name: &'static str, data: &AppState, id: usize) -> Template {
+fn show_question_details(template_name: &'static str, data: &AppState, id: u32) -> Template {
-    match get_question(&data.db, id) {
+    match get_question(&data.storage, id) {
         Ok(question) => {
             let mut context = serde_json::to_value(question).expect("question serialize");
             if context.is_object() {
@@ -76,18 +73,18 @@ fn show_question_details(template_name: &'static str, data: &AppState, id: usize
         Err(_) => {
             use std::collections::HashMap;
             let context: HashMap<String, String> = HashMap::new();
-            Template::render("404", context)
+            Template::render("404", &context)
         }
     }
 }
 
 #[get("/q/<id>")]
-fn show_question(data: State<AppState>, id: usize) -> Template {
+fn show_question(data: State<AppState>, id: u32) -> Template {
     show_question_details("question", data.inner(), id)
 }
 
 #[get("/q/<id>/a")]
-fn show_answer(data: State<AppState>, id: usize) -> Template {
+fn show_answer(data: State<AppState>, id: u32) -> Template {
     show_question_details("answer", data.inner(), id)
 }
 
@@ -111,11 +108,23 @@ fn index(data: State<AppState>) -> Redirect {
 fn not_found(_req: &rocket::Request) -> Template {
     use std::collections::HashMap;
     let context: HashMap<String, String> = HashMap::new();
-    Template::render("404", context)
+    Template::render("404", &context)
 }
 
 fn rocket() -> Rocket {
-    let state: AppState = db::Reader::new(DB_FILENAME, 2048).expect("open db").into();
+    let options: Options = serde_json::from_value(serde_json::json!({
+    "read_only": true,
+    "no_lock": true,
+    }))
+    .unwrap();
+
+    let mut state = AppState {
+        storage: Storage::new("db", options).expect("open db"),
+        database_distribution: Uniform::new(1, 3),
+    };
+    state.database_distribution = get_database_distribution(&state.storage);
+
+    let state = state;
 
     rocket::ignite()
         .manage(state)