use [err, res] pattern for server axios

TODO.md

@@ -8,6 +8,9 @@ discord bot
 email ppl who signed up
     say we have updates
 
+order by dropdown for main list
+sample offer with tooltips
+
 go over and reorganise event logic
     should be connection.service ?
 

api/src/discogs.ts

@@ -10,9 +10,19 @@ import type { PrismaClient, Want, User, Listing } from '@prisma/client';
 import { logAxiosError, wantDetails } from './utils';
 import { Pg } from './pg';
 
-// margh
-// vanderbabe
-// jmcdermid1
+type ApiResponse = [string | null, any | null];
+
+declare module 'axios' {
+  export interface AxiosInstance {
+    request(config: AxiosRequestConfig): Promise<ApiResponse>;
+    get(url: string, config?: AxiosRequestConfig): Promise<ApiResponse>;
+    delete(url: string, config?: AxiosRequestConfig): Promise<ApiResponse>;
+    head(url: string, config?: AxiosRequestConfig): Promise<ApiResponse>;
+    post(url: string, data?: any, config?: AxiosRequestConfig): Promise<ApiResponse>;
+    put(url: string, data?: any, config?: AxiosRequestConfig): Promise<ApiResponse>;
+    patch(url: string, data?: any, config?: AxiosRequestConfig): Promise<ApiResponse>;
+  }
+}
 
 export default function createDiscogs(log: Log, pg: Pg) {
     const TOKEN = 'Discogs token=wRTXuYZGOPsIQgKRGKCAkUkidGtvpSfQgPWkYIpD';
@@ -28,24 +38,27 @@ export default function createDiscogs(log: Log, pg: Pg) {
     });
 
     function onSuccess(response) {
-        return response;
+        return [null, response.data];
     }
 
     function onError(error) {
-        // if (error.response) return [error.response.data.error, null];
-        // if (error.request) return ['Network Error', null];
-        // return ['Unknown Error', null];
+        console.error(error);
         if (error.response.status === 429) {
-            throw new Error('rate limited, try again in 1 minute');
+            return [new Error('rate limited, try again in 1 minute'), null];
         }
+        if (error.response) return [error.response.data, null];
+        if (error.request) return ['Network Error', null];
+        return ['Unknown Error', null];
     }
-
     api.interceptors.response.use(onSuccess, onError);
 
     async function wantListSync(username: string, user: User): Promise<Want[]> {
-        const { data: { wants, pagination }} = await api.get(`${apiBase}/users/${username}/wants`);
-        const releases = await Promise.all(wants.map(want => release(want.id)));
+        const [err, res] = await api.get(`${apiBase}/users/${username}/wants`);
+        log.warn(err, res);
+        if (err) throw err;
+        const { wants, pagination } = res;
 
+        const releases = await Promise.all(wants.map(want => release(want.id)));
         log.info({ wants: wants.length, user: username, userId: user.id }, 'fetched discogs wantlist');
 
         // TODO filter releases to be vinyl format only
@@ -62,7 +75,7 @@ export default function createDiscogs(log: Log, pg: Pg) {
     }
 
     async function release(id: DiscogsRelease): Promise<any> {
-        const { data } = await api.get(`${apiBase}/releases/${id}`);
+        const [error, data] = await api.get(`${apiBase}/releases/${id}`);
         return data;
     }
 
@@ -71,18 +84,23 @@ export default function createDiscogs(log: Log, pg: Pg) {
         url.searchParams.append('query', query);
         url.searchParams.append('type', 'release');
         url.searchParams.append('format', 'vinyl');
-        const { data: { results } } = await api.get(url.href);
+        const [err, res] = await api.get(url.href);
+        if (err) throw err;
+        const { results } = res;
         return results;
     }
 
     async function inventory(user: string) {
-        const res = await api.get(`${apiBase}/users/${user}/inventory`);
-        return res.data.listings;
+        const [err, res] = await api.get(`${apiBase}/users/${user}/inventory`);
+        if (err) throw err;
+        return res.listings;
     }
 
     async function listings(want: Want) {
-        const res = await api.get(`https://www.discogs.com/sell/release/${want.release}?limit=250`);
-        const $ = cheerio.load(res.data);
+        const [err, res] = await api.get(`https://www.discogs.com/sell/release/${want.release}?limit=250`);
+        if (err) throw err;
+
+        const $ = cheerio.load(res);
         const ids = $('.item_description_title[href]')
             .map(function getListingId() {
                 const id = Number.parseInt(this.attribs.href.replace('/sell/item/', ''), 10);
@@ -102,9 +120,9 @@ export default function createDiscogs(log: Log, pg: Pg) {
         if (listing) return listing;
 
         log.debug('fetching listing', id);
-        const res = await api.get(`${apiBase}/marketplace/listings/${id}`);
-        log.debug(res.data);
-        return pg.listingUpsert(res.data, want);
+        const [err, discogsListing] = await api.get(`${apiBase}/marketplace/listings/${id}`);
+        log.debug(discogsListing);
+        return pg.listingUpsert(discogsListing, want);
     }
 
     return {