improve logging of fetch error (#12)

Author: sebastianhaeni

src/lib/client.ts

@@ -3,13 +3,37 @@ import { getCompetitionStatus } from '@/lib/manager';
 import config from '@/lib/config';
 
 export async function getCompetitionsWithStatus(): Promise<CompetitionWithStatus[]> {
-  const res = await fetch(config.competitionsMetadataUrl);
+  const url = config.competitionsMetadataUrl;
+  const res = await fetchWithDetailedErrors(url);
+  const payload = await parseJsonWithDetailedErrors(res, url);
+
+  const competitions = (payload as { competitions: Competition[] }).competitions;
+
+  return Promise.all(competitions.map((competition) => getCompetitionStatus(competition)));
+}
+
+async function fetchWithDetailedErrors(url: string): Promise<Response> {
+  let res: Response;
+  try {
+    res = await fetch(url);
+  } catch (error) {
+    const reason = error instanceof Error ? error.message : String(error);
+    throw new Error(`Failed to fetch competitions metadata from ${url}: ${reason}`);
+  }
 
   if (!res.ok) {
-    throw new Error('Failed to fetch data');
+    const details = `HTTP ${res.status} ${res.statusText}`.trim();
+    throw new Error(`Failed to fetch competitions metadata from ${url}: ${details}`);
   }
 
-  const competitions = (await res.json()).competitions as Competition[];
+  return res;
+}
 
-  return Promise.all(competitions.map((competition) => getCompetitionStatus(competition)));
+async function parseJsonWithDetailedErrors(res: Response, url: string): Promise<unknown> {
+  try {
+    return await res.json();
+  } catch (error) {
+    const reason = error instanceof Error ? error.message : String(error);
+    throw new Error(`Failed to parse competitions metadata JSON from ${url}: ${reason}`);
+  }
 }

src/lib/config.ts

@@ -1,6 +1,6 @@
 import dotenv from 'dotenv';
 
-dotenv.config();
+dotenv.config({quiet: true});
 
 const config = {
   competitionsMetadataUrl: