feat: can get actual available roots

Signed-off-by: kjuulh <contact@kjuulh.io>

crates/hyperlog-server/src/services/get_available_roots.rs

@@ -0,0 +1,54 @@
+use hyperlog_core::log::{GraphItem, ItemState};
+use sqlx::types::Json;
+
+use crate::state::SharedState;
+
+#[derive(Clone)]
+pub struct GetAvailableRoots {
+    db: sqlx::PgPool,
+}
+
+pub struct Request {}
+pub struct Response {
+    pub roots: Vec<String>,
+}
+
+#[derive(sqlx::FromRow)]
+pub struct Root {
+    root_name: String,
+}
+
+impl GetAvailableRoots {
+    pub fn new(db: sqlx::PgPool) -> Self {
+        Self { db }
+    }
+
+    pub async fn execute(&self, req: Request) -> anyhow::Result<Response> {
+        let roots: Vec<Root> = sqlx::query_as(
+            r#"
+    SELECT
+        *
+    FROM
+        roots
+    LIMIT
+        100
+            "#,
+        )
+        .fetch_all(&self.db)
+        .await?;
+
+        Ok(Response {
+            roots: roots.into_iter().map(|i| i.root_name).collect(),
+        })
+    }
+}
+
+pub trait GetAvailableRootsExt {
+    fn get_available_roots_service(&self) -> GetAvailableRoots;
+}
+
+impl GetAvailableRootsExt for SharedState {
+    fn get_available_roots_service(&self) -> GetAvailableRoots {
+        GetAvailableRoots::new(self.db.clone())
+    }
+}