Decouple core Yaak logic from Tauri (#354)

crates/yaak-models/src/db_context.rs

@@ -0,0 +1,211 @@
+use crate::connection_or_tx::ConnectionOrTx;
+use crate::error::Error::ModelNotFound;
+use crate::error::Result;
+use crate::models::{AnyModel, UpsertModelInfo};
+use crate::util::{ModelChangeEvent, ModelPayload, UpdateSource};
+use log::error;
+use rusqlite::OptionalExtension;
+use sea_query::{
+    Asterisk, Expr, Func, IntoColumnRef, IntoIden, IntoTableRef, OnConflict, Query, SimpleExpr,
+    SqliteQueryBuilder,
+};
+use sea_query_rusqlite::RusqliteBinder;
+use std::fmt::Debug;
+use std::sync::mpsc;
+
+pub struct DbContext<'a> {
+    pub(crate) events_tx: mpsc::Sender<ModelPayload>,
+    pub(crate) conn: ConnectionOrTx<'a>,
+}
+
+impl<'a> DbContext<'a> {
+    pub(crate) fn find_one<'s, M>(
+        &self,
+        col: impl IntoColumnRef + IntoIden + Clone,
+        value: impl Into<SimpleExpr> + Debug,
+    ) -> Result<M>
+    where
+        M: Into<AnyModel> + Clone + UpsertModelInfo,
+    {
+        let value_debug = format!("{:?}", value);
+
+        let value_expr = value.into();
+        let (sql, params) = Query::select()
+            .from(M::table_name())
+            .column(Asterisk)
+            .cond_where(Expr::col(col.clone()).eq(value_expr))
+            .build_rusqlite(SqliteQueryBuilder);
+        let mut stmt = self.conn.prepare(sql.as_str()).expect("Failed to prepare query");
+        match stmt.query_row(&*params.as_params(), M::from_row) {
+            Ok(result) => Ok(result),
+            Err(rusqlite::Error::QueryReturnedNoRows) => Err(ModelNotFound(format!(
+                r#"table "{}" {} == {}"#,
+                M::table_name().into_iden().to_string(),
+                col.into_iden().to_string(),
+                value_debug
+            ))),
+            Err(e) => Err(crate::error::Error::SqlError(e)),
+        }
+    }
+
+    pub(crate) fn find_optional<'s, M>(
+        &self,
+        col: impl IntoColumnRef,
+        value: impl Into<SimpleExpr>,
+    ) -> Option<M>
+    where
+        M: Into<AnyModel> + Clone + UpsertModelInfo,
+    {
+        let (sql, params) = Query::select()
+            .from(M::table_name())
+            .column(Asterisk)
+            .cond_where(Expr::col(col).eq(value))
+            .build_rusqlite(SqliteQueryBuilder);
+        let mut stmt = self.conn.prepare(sql.as_str()).expect("Failed to prepare query");
+        stmt.query_row(&*params.as_params(), M::from_row)
+            .optional()
+            .expect("Failed to run find on DB")
+    }
+
+    pub(crate) fn find_all<'s, M>(&self) -> Result<Vec<M>>
+    where
+        M: Into<AnyModel> + Clone + UpsertModelInfo,
+    {
+        let (order_by_col, order_by_dir) = M::order_by();
+        let (sql, params) = Query::select()
+            .from(M::table_name())
+            .column(Asterisk)
+            .order_by(order_by_col, order_by_dir)
+            .build_rusqlite(SqliteQueryBuilder);
+        let mut stmt = self.conn.resolve().prepare(sql.as_str())?;
+        let items = stmt.query_map(&*params.as_params(), M::from_row)?;
+        Ok(items.map(|v| v.unwrap()).collect())
+    }
+
+    pub(crate) fn find_many<'s, M>(
+        &self,
+        col: impl IntoColumnRef,
+        value: impl Into<SimpleExpr>,
+        limit: Option<u64>,
+    ) -> Result<Vec<M>>
+    where
+        M: Into<AnyModel> + Clone + UpsertModelInfo,
+    {
+        // TODO: Figure out how to do this conditional builder better
+        let (order_by_col, order_by_dir) = M::order_by();
+        let (sql, params) = if let Some(limit) = limit {
+            Query::select()
+                .from(M::table_name())
+                .column(Asterisk)
+                .cond_where(Expr::col(col).eq(value))
+                .limit(limit)
+                .order_by(order_by_col, order_by_dir)
+                .build_rusqlite(SqliteQueryBuilder)
+        } else {
+            Query::select()
+                .from(M::table_name())
+                .column(Asterisk)
+                .cond_where(Expr::col(col).eq(value))
+                .order_by(order_by_col, order_by_dir)
+                .build_rusqlite(SqliteQueryBuilder)
+        };
+
+        let mut stmt = self.conn.resolve().prepare(sql.as_str())?;
+        let items = stmt.query_map(&*params.as_params(), M::from_row)?;
+        Ok(items.map(|v| v.unwrap()).collect())
+    }
+
+    pub(crate) fn upsert<M>(&self, model: &M, source: &UpdateSource) -> Result<M>
+    where
+        M: Into<AnyModel> + From<AnyModel> + UpsertModelInfo + Clone,
+    {
+        self.upsert_one(
+            M::table_name(),
+            M::id_column(),
+            model.get_id().as_str(),
+            model.clone().insert_values(source)?,
+            M::update_columns(),
+            source,
+        )
+    }
+
+    fn upsert_one<M>(
+        &self,
+        table: impl IntoTableRef,
+        id_col: impl IntoIden + Eq + Clone,
+        id_val: &str,
+        other_values: Vec<(impl IntoIden + Eq, impl Into<SimpleExpr>)>,
+        update_columns: Vec<impl IntoIden>,
+        source: &UpdateSource,
+    ) -> Result<M>
+    where
+        M: Into<AnyModel> + From<AnyModel> + UpsertModelInfo + Clone,
+    {
+        let id_iden = id_col.into_iden();
+        let mut column_vec = vec![id_iden.clone()];
+        let mut value_vec =
+            vec![if id_val == "" { M::generate_id().into() } else { id_val.into() }];
+
+        for (col, val) in other_values {
+            value_vec.push(val.into());
+            column_vec.push(col.into_iden());
+        }
+
+        let on_conflict = OnConflict::column(id_iden).update_columns(update_columns).to_owned();
+
+        let (sql, params) = Query::insert()
+            .into_table(table)
+            .columns(column_vec)
+            .values_panic(value_vec)
+            .on_conflict(on_conflict)
+            .returning(Query::returning().exprs(vec![
+                Expr::col(Asterisk),
+                Expr::expr(Func::cust("last_insert_rowid")),
+                Expr::col("rowid"),
+            ]))
+            .build_rusqlite(SqliteQueryBuilder);
+
+        let mut stmt = self.conn.resolve().prepare(sql.as_str())?;
+        let (m, created): (M, bool) = stmt.query_row(&*params.as_params(), |row| {
+            M::from_row(row).and_then(|m| {
+                let rowid: i64 = row.get("rowid")?;
+                let last_rowid: i64 = row.get("last_insert_rowid()")?;
+                Ok((m, rowid == last_rowid))
+            })
+        })?;
+
+        let payload = ModelPayload {
+            model: m.clone().into(),
+            update_source: source.clone(),
+            change: ModelChangeEvent::Upsert { created },
+        };
+
+        if let Err(e) = self.events_tx.send(payload.clone()) {
+            error!("Failed to send model change {source:?}: {e:?}");
+        }
+
+        Ok(m)
+    }
+
+    pub(crate) fn delete<'s, M>(&self, m: &M, source: &UpdateSource) -> Result<M>
+    where
+        M: Into<AnyModel> + Clone + UpsertModelInfo,
+    {
+        let (sql, params) = Query::delete()
+            .from_table(M::table_name())
+            .cond_where(Expr::col(M::id_column().into_iden()).eq(m.get_id()))
+            .build_rusqlite(SqliteQueryBuilder);
+        self.conn.execute(sql.as_str(), &*params.as_params())?;
+
+        let payload = ModelPayload {
+            model: m.clone().into(),
+            update_source: source.clone(),
+            change: ModelChangeEvent::Delete,
+        };
+
+        if let Err(e) = self.events_tx.send(payload) {
+            error!("Failed to send model change {source:?}: {e:?}");
+        }
+        Ok(m.clone())
+    }
+}