refactor: fetch mscz res

src/mscz.ts

@@ -1,5 +1,5 @@
 
-import { saveAs } from './utils'
+import { saveAs, assertRes } from './utils'
 import scoreinfo from './scoreinfo'
 
 let msczBufferP: Promise<ArrayBuffer> | undefined
@@ -9,8 +9,10 @@ export const fetchMscz = async (): Promise<ArrayBuffer> => {
     const url = scoreinfo.msczCidUrl
     msczBufferP = (async (): Promise<ArrayBuffer> => {
       const r0 = await fetch(url)
+      assertRes(r0)
       const { Key } = await r0.json()
       const r = await fetch(`https://ipfs.infura.io/ipfs/${Key as string}`)
+      assertRes(r)
       const data = await r.arrayBuffer()
       return data
     })()

src/utils.ts

@@ -19,6 +19,10 @@ export const fetchData = async (url: string, init?: RequestInit): Promise<Uint8A
   return new Uint8Array(data)
 }
 
+export const assertRes = (r: Response): void => {
+  if (!r.ok) throw new Error(`${r.url} ${r.status} ${r.statusText}`)
+}
+
 export const useTimeout = async <T> (promise: T | Promise<T>, ms: number): Promise<T> => {
   if (!(promise instanceof Promise)) {
     return promise