1 files changed, 72 insertions, 0 deletions
diff --git a/src/database.rs b/src/database.rs
new file mode 100644
index 0000000..edb2fc7
--- /dev/null
+++ b/src/database.rs
@@ -0,0 +1,72 @@
+use std::str::FromStr;
+
+use futures::TryStreamExt;
+use log::{debug, error, info, warn};
+use sqlx::Row;
+use sqlx::sqlite::{SqliteConnectOptions, SqlitePoolOptions};
+
+use crate::user::User;
+
+pub type DbPool = sqlx::sqlite::SqlitePool;
+
+const SQLITE_THREAD_POOL_SIZE: u32 = 16;
+
+pub async fn open(file_path: &str) -> Result<DbPool, sqlx::Error> {
+    let opt =
+        SqliteConnectOptions::from_str(format!("sqlite://{}", file_path).as_str())?
+            .create_if_missing(true);
+    let pool = SqlitePoolOptions::new()
+        .max_connections(SQLITE_THREAD_POOL_SIZE)
+        .connect_with(opt).await?;
+
+    // create table
+    sqlx::query(r#"CREATE TABLE IF NOT EXISTS "user" (
+                "id"	INTEGER NOT NULL CHECK(id >= 0) UNIQUE,
+                "name"	TEXT,
+                "token"	TEXT NOT NULL UNIQUE,
+                "chat_id"	INTEGER NOT NULL CHECK(chat_id >= 0) UNIQUE,
+                PRIMARY KEY("id","token","chat_id")
+        )"#).execute(&pool).await?;
+
+    Ok(pool)
+}
+
+pub async fn get_user(db: &DbPool, sql: &str, param: &str) -> Result<Option<User>, sqlx::Error> {
+    let mut rows =
+        sqlx::query(sql)
+            .bind(param).fetch(db);
+    let result = rows.try_next().await?;
+    match result {
+        None => Ok(None),
+        Some(row) => {
+            let id: i64 = row.try_get("id")?;
+            let chat_id: i64 = row.try_get("chat_id")?;
+            Ok(Some(User {
+                id: id as u64,
+                name: row.try_get("name")?,
+                token: row.try_get("token")?,
+                chat_id: chat_id as u64,
+            }))
+        }
+    }
+}
+
+pub async fn get_user_by_token(db: &DbPool, token: &str) -> Result<Option<User>, sqlx::Error> {
+    get_user(db, "SELECT id, name, token, chat_id FROM user WHERE token=$1 LIMIT 1",
+             token).await
+}
+
+pub async fn get_user_by_chat_id(db: &DbPool, chat_id: u64) -> Result<Option<User>, sqlx::Error> {
+    get_user(db, "SELECT id, name, token, chat_id FROM user WHERE chat_id=$1 LIMIT 1",
+             chat_id.to_string().as_str()).await
+}
+
+pub async fn create_user(db: &DbPool, user: User) -> sqlx::Result<()> {
+    sqlx::query("INSERT INTO user (id, name, token, chat_id) VALUES ($1,$2,$3,$4)")
+        .bind(user.id.to_string())
+        .bind(user.name)
+        .bind(user.token)
+        .bind(user.chat_id.to_string())
+        .execute(db).await?;
+    Ok(())
+}
+\ No newline at end of file