Add frontend server logic for querying a dataset

frontend/src/lib/server/backend.ts

@@ -13,18 +13,20 @@ export type Dataset = {
   description: string;
 };
 
-export async function list_datasets(): Promise<Dataset[]> {
-  const query = `
-    query {
-      datasets {
-        id
-        name
-        description
-      }
-    }
-  `;
-  return (await query_graphql<{datasets: Dataset[]}>(query)).datasets;
-}
+export type Location = {
+  id: number,
+  name: string,
+  lat: number,
+  lon: number;
+};
+
+export type Record = {
+  id: number,
+  dataset_id: number,
+  location_id: number | undefined,
+  timestamp: string,
+  data: string;
+};
 
 async function query_graphql<T>(query: string): Promise<T> {
   const response = await fetch('http://host.containers.internal:3000/graphql', {
@@ -47,3 +49,33 @@ async function query_graphql<T>(query: string): Promise<T> {
 
   return result.data!;
 } 
+
+export async function list_datasets(): Promise<Dataset[]> {
+  const query = `
+    query {
+      datasets {
+        id
+        name
+        description
+      }
+    }
+  `;
+  return (await query_graphql<{ datasets: Dataset[] }>(query)).datasets;
+}
+
+export async function query_dataset(id: string): Promise<Record> {
+  // TODO: Maybe just interpolating the id like this isn't the best way to do it.
+  const query = `
+    query {
+      queryDataset(id: ${id}) {
+        id
+        locationId
+        data
+      }
+    }
+  `;
+
+  return (await query_graphql<{
+    queryDataset: Record,
+  }>(query)).queryDataset;
+}