retry body_as_text 3 times

src/utils.ts

@@ -1,8 +1,22 @@
 import * as httpm from 'typed-rest-client/HttpClient';
 import { BearerCredentialHandler } from 'typed-rest-client/Handlers';
+import { IHttpClientResponse } from 'typed-rest-client/Interfaces';
 
 export async function body_as_text(url: string, token: string = ''): Promise<string> {
     const bearer = token ? [ new BearerCredentialHandler(token) ] : undefined;
-    let client = new httpm.HttpClient("dlang-community/setup-dlang", bearer);
-    return (await (await client.get(url)).readBody()).trim();
+    const timeouts = [5000, 10000, 20000];
+    let retry = 0;
+    let res: IHttpClientResponse | undefined = undefined;
+    for (; retry < 3; retry++) {
+        const client = new httpm.HttpClient("dlang-community/setup-dlang", bearer);
+        res = await client.get(url);
+        // redirects are followed by the library, check for error codes here
+        const statusCode = res?.message?.statusCode ?? 500;
+        if (statusCode >= 400) {
+            await new Promise(resolve => setTimeout(resolve, timeouts[retry]));
+            continue;
+        }
+        return (await res.readBody()).trim();
+    }
+    throw new Error(`failed requesting ${url} - aborting after ${retry} tries\n${res?.message.statusCode} ${res?.message.statusMessage}:\n${res?.message.rawHeaders.join('\n')}\n\n${(await res?.readBody())?.trim()}`);
 }