Split server into crate

crates/pile-serve/src/config_schema.rs

@@ -0,0 +1,30 @@
+use axum::{
+	Json,
+	extract::State,
+	http::StatusCode,
+	response::{IntoResponse, Response},
+};
+use pile_dataset::Datasets;
+use std::{collections::HashMap, sync::Arc};
+
+pub use pile_config::FieldSpec;
+
+pub type FieldsResponse = HashMap<String, FieldSpec>;
+
+/// Retrieve this dataset's schema.
+#[utoipa::path(
+	get,
+	path = "/config/schema",
+	responses(
+		(status = 200, description = "This dataset's schema"),
+	)
+)]
+pub async fn config_schema(State(state): State<Arc<Datasets>>) -> Response {
+	let fields: FieldsResponse = state
+		.config
+		.schema
+		.iter()
+		.map(|(k, v)| (k.as_str().to_owned(), v.clone()))
+		.collect();
+	(StatusCode::OK, Json(fields)).into_response()
+}