refactor: rewrite async promise as promise chain

src/content/pricing/pricestf.ts

@@ -1,6 +1,6 @@
 declare function GM_fetch(input: string | URL | globalThis.Request, init?: RequestInit): Promise<Response>
 import '../GM_fetch'
-import { logDebug } from '../utils/log'
+import { logDebug, logError } from '../utils/log'
 
 async function getPricesToken(): Promise<string> {
   return new Promise<string>((resolve, reject) => {
@@ -42,62 +42,48 @@ async function priceUsingPricesTF(token: string, sku: string, retries: number =
   // prices.tf
   // https://api2.prices.tf/prices/${sku}
   // Authorization: Bearer ${token}
-  return new Promise(async (resolve, reject) => {
-    if (!token) {
-      reject(401)
-    }
-    let response = await GM_fetch(`https://api2.prices.tf/prices/${encodeURIComponent(sku)}`, {
+  return GM_fetch(`https://api2.prices.tf/prices/${encodeURIComponent(sku)}`, {
     method: 'get',
-      headers: new Headers({
+    headers: {
       'Accept': 'application/json',
-        'Authorization': `Bearer ${token}`
+      'Authorization': `Bearer ${token}`,
+    }
   })
-    })
-    if (response.status === 404 && sku.includes(';')) {
+  .then(response => {
+    if (!response.ok) {
+      throw new Error(`HTTP error! Status: ${response.status}`);
+    }
+    if (response.status === 404 && sku.includes(';') && !sku.includes(';uncraftable')) {
       const quality: number = parseInt(sku.split(';')[1], 10);
       if(quality === 6) {
         // Try uncraftable variant if unique weapon
-        response = await GM_fetch(`https://api2.prices.tf/prices/${encodeURIComponent(sku + ';uncraftable')}`, {
-          method: 'get',
-          headers: new Headers({
-            'Accept': 'application/json',
-            'Authorization': `Bearer ${token}`
-          })
-        })
+        return priceUsingPricesTF(token, sku + ';uncraftable', retries);
       }
     }
-    switch (response.status) {
-      case 200:
-        const json = await response.json()
-        resolve({ keys: json['sellKeys'], metal: json['sellHalfScrap'] / 18.0 })
-        break;
-      case 404:
-        reject("Not found in prices.tf")
-        break;
-      case 429:
-      case 503:
+    if(response.status === 404) {
+      throw new Error(`Item not found: ${sku}`);
+    }
+    if(response.status === 503) {
       // Happens if we send too many requests in a short period of time
       // Retry after a few seconds
       if(retries > 0) {
         logDebug(`Cloudflare rate limit exceeded, trying again after 2 seconds, ${retries} retries left`)
-          await new Promise(resolve => setTimeout(resolve, 2000));
-          try {
-            const retryResult = await priceUsingPricesTF(token, sku, retries - 1);
-            resolve(retryResult);
-          } catch (err) {
-            reject(err);
-          }
+        return priceUsingPricesTF(token, sku, retries - 1);
       } else {
-          reject("Cloudflare rate limit exceeded, stopping")
+        throw new Error(`Cloudflare rate limit exceeded, stopping`)
       }
-        break;
-      default:
-        // Something went wrong
-        logDebug(`Received ${response.status} error while pricing ${sku}`)
-        logDebug(`${JSON.stringify(response.headers)}`)
-        reject("Unknown error")
-        break;
     }
+    return response.json();
+  })
+  .then(data => {
+    const prices = new PricesResponse();
+    prices.keys = data['sellKeys']
+    prices.metal = data['sellHalfScrap'] / 18.0;
+    return prices;
+  })
+  .catch(error => {
+    logError(`Failed to fetch prices from prices.tf for item ${sku}`)
+    throw error;
   })
 }