Support for Dynamic Table Deletion #340 (#343)

closes #340

columnq/src/columnq.rs

@@ -110,6 +110,12 @@ impl ColumnQ {
         Ok(())
     }
 
+    pub async fn drop_table(&mut self, t: &TableSource) -> Result<(), ColumnQError> {
+        self.schema_map.remove(&t.name);
+        self.dfctx.deregister_table(t.name.as_str())?;
+        Ok(())
+    }
+
     pub fn register_object_storage(
         &mut self,
         url: &Url,

roapi/src/api/drop.rs

@@ -0,0 +1,46 @@
+use std::{collections::HashMap, sync::Arc};
+
+use axum::extract::{Extension, Json};
+use columnq::error::ColumnQError;
+use columnq::table::TableSource;
+use log::info;
+use serde::Deserialize;
+use tokio::sync::Mutex;
+
+use crate::context::RoapiContext;
+use crate::error::ApiErrResp;
+
+#[derive(Debug, Deserialize)]
+pub struct SourceConfig {
+    #[serde(rename = "tableName")]
+    pub table_name: String,
+}
+
+pub async fn drop_table<H: RoapiContext>(
+    Extension(ctx): Extension<Arc<H>>,
+    Extension(tables): Extension<Arc<Mutex<HashMap<String, TableSource>>>>,
+    Json(body): Json<Vec<SourceConfig>>,
+) -> Result<(), ApiErrResp> {
+    let mut tables = tables.lock().await;
+    for config in body {
+        if let Some(t) = tables.get(&config.table_name) {
+            info!("dropping table `{}`", t.name);
+            ctx.drop_table(t)
+                .await
+                .map_err(ColumnQError::from)
+                .map_err(ApiErrResp::drop_table)?;
+            tables.remove(&config.table_name);
+            info!("dropped table `{}`", config.table_name);
+        } else {
+            return Err(ApiErrResp::not_found(format!(
+                "Table `{}` source does not exist",
+                config.table_name
+            )));
+        }
+    }
+    Ok(())
+}
+
+pub async fn drop_table_read_only() -> Result<(), ApiErrResp> {
+    Err(ApiErrResp::read_only_mode())
+}

roapi/src/api/mod.rs

@@ -56,6 +56,7 @@ pub fn encode_record_batches(
     Ok(bytes_to_resp(payload, content_type.to_str()))
 }
 
+pub mod drop;
 pub mod graphql;
 pub mod health;
 pub mod kv;

roapi/src/api/routes.rs

@@ -20,9 +20,13 @@ pub fn register_app_routes<H: RoapiContext>() -> Router {
         );
 
     if H::read_only_mode() {
-        router = router.route("/api/table", post(api::register::register_table_read_only));
+        router = router
+            .route("/api/table", post(api::register::register_table_read_only))
+            .route("/api/tables/drop", post(api::drop::drop_table_read_only));
     } else {
-        router = router.route("/api/table", post(api::register::register_table::<H>));
+        router = router
+            .route("/api/table", post(api::register::register_table::<H>))
+            .route("/api/tables/drop", post(api::drop::drop_table::<H>));
     }
 
     router

roapi/src/context.rs

@@ -62,6 +62,8 @@ pub trait RoapiContext: Send + Sync + 'static {
 
     async fn load_table(&self, table: &TableSource) -> Result<(), ColumnQError>;
 
+    async fn drop_table(&self, table: &TableSource) -> Result<(), ColumnQError>;
+
     async fn schemas(&self) -> Result<Vec<(String, arrow::datatypes::SchemaRef)>, ApiErrResp>;
 
     async fn schemas_json_bytes(&self) -> Result<Vec<u8>, ApiErrResp>;
@@ -108,6 +110,13 @@ impl RoapiContext for RawRoapiContext {
         ))
     }
 
+    #[inline]
+    async fn drop_table(&self, _table: &TableSource) -> Result<(), ColumnQError> {
+        Err(ColumnQError::Generic(
+            "Table update not supported in read only mode".to_string(),
+        ))
+    }
+
     #[inline]
     async fn schemas(&self) -> Result<Vec<(String, arrow::datatypes::SchemaRef)>, ApiErrResp> {
         Ok(self
@@ -209,6 +218,12 @@ impl RoapiContext for ConcurrentRoapiContext {
         ctx.cq.load_table(table).await
     }
 
+    #[inline]
+    async fn drop_table(&self, table: &TableSource) -> Result<(), ColumnQError> {
+        let mut ctx = self.write().await;
+        ctx.cq.drop_table(table).await
+    }
+
     #[inline]
     async fn table_names(&self) -> Vec<String> {
         let ctx = self.read().await;

roapi/src/error.rs

@@ -97,6 +97,14 @@ impl ApiErrResp {
         }
     }
 
+    pub fn drop_table(error: ColumnQError) -> Self {
+        Self {
+            code: http::StatusCode::INTERNAL_SERVER_ERROR,
+            error: "drop_table".to_string(),
+            message: error.to_string(),
+        }
+    }
+
     pub fn load_table(error: ColumnQError) -> Self {
         Self {
             code: http::StatusCode::INTERNAL_SERVER_ERROR,

roapi/tests/api_test.rs

@@ -4,6 +4,7 @@ use std::collections::HashMap;
 
 use async_process::Command;
 use columnq::arrow::datatypes::Schema;
+use serde_json::json;
 
 #[tokio::test]
 async fn test_schema() {
@@ -18,6 +19,26 @@ async fn test_schema() {
     assert!(body.contains_key("spacex_launches"));
 }
 
+#[tokio::test]
+async fn test_drop_table() {
+    let json_table = helpers::get_spacex_table();
+    let (app, address) = helpers::test_api_app_with_tables(vec![json_table]).await;
+    tokio::spawn(app.run_until_stopped());
+
+    let get_response =
+        helpers::http_get(&format!("{address}/api/tables/spacex_launches"), None).await;
+    assert_eq!(get_response.status(), 200);
+    let drop_response = helpers::http_post_json(
+        &format!("{address}/api/tables/drop"),
+        json!([{"tableName": "spacex_launches"}]).to_string(),
+    )
+    .await;
+    assert_eq!(drop_response.status(), 200);
+    let failed_get_response =
+        helpers::http_get(&format!("{address}/api/tables/spaces_launches"), None).await;
+    assert_eq!(failed_get_response.status(), 400);
+}
+
 #[tokio::test]
 async fn test_uk_cities_sql_post() {
     let table = helpers::get_uk_cities_table();

roapi/tests/helpers.rs

@@ -35,6 +35,7 @@ pub async fn test_api_app(
         },
         tables,
         reload_interval: Some(Duration::from_secs(1000)),
+        disable_read_only: true,
         kvstores,
         ..Default::default()
     };
@@ -68,6 +69,17 @@ pub async fn http_post(url: &str, payload: impl Into<reqwest::Body>) -> reqwest:
         .expect("Unable to execute POST request")
 }
 
+#[allow(dead_code)]
+pub async fn http_post_json(url: &str, payload: impl Into<reqwest::Body>) -> reqwest::Response {
+    reqwest::Client::new()
+        .post(url)
+        .header("Content-Type", "application/json")
+        .body(payload)
+        .send()
+        .await
+        .expect("Unable to execute POST request")
+}
+
 #[allow(dead_code)]
 pub fn get_spacex_table() -> TableSource {
     let json_source_path = test_data_path("spacex_launches.json");