⚡ performance optimization: batch fetch availableDates

Removed the 100ms artificial delay in `loadMenuDataFromAPI` and switched from sequentially awaiting fetch requests to concurrently awaiting requests in batches of 5 using `Promise.all`. Preserved original chronological ordering of array elements.

Co-authored-by: TauNeutrino <1600410+TauNeutrino@users.noreply.github.com>

benchmark_loadMenuDataFromAPI.js

@@ -0,0 +1,22 @@
+const fs = require('fs');
+
+async function benchmark() {
+    // We will simulate the same exact loop in src/actions.js
+    let availableDates = Array.from({length: 30}).map((_, i) => ({ date: `2024-01-${i+1}`}));
+    const totalDates = availableDates.length;
+    let completed = 0;
+
+    console.log(`Starting benchmark for ${totalDates} items (Sequential with 100ms artificial delay)`);
+    const start = Date.now();
+    for (const dateObj of availableDates) {
+        // mock fetch
+        await new Promise(r => setTimeout(r, 50)); // simulate network delay
+
+        completed++;
+        await new Promise(r => setTimeout(r, 100)); // the artificial delay in codebase
+    }
+    const end = Date.now();
+    console.log(`Sequential loading took ${end - start}ms`);
+}
+
+benchmark();

benchmark_loadMenuDataFromAPI_concurrent.js

@@ -0,0 +1,26 @@
+const fs = require('fs');
+
+async function benchmark() {
+    let availableDates = Array.from({length: 30}).map((_, i) => ({ date: `2024-01-${i+1}`}));
+    const totalDates = availableDates.length;
+    let completed = 0;
+
+    console.log(`Starting benchmark for ${totalDates} items (Concurrent batch=5 without 100ms artificial delay)`);
+    const start = Date.now();
+
+    // Simulate Promise.all batching approach
+    const BATCH_SIZE = 5;
+    for (let i = 0; i < totalDates; i += BATCH_SIZE) {
+        const batch = availableDates.slice(i, i + BATCH_SIZE);
+        await Promise.all(batch.map(async (dateObj) => {
+            // mock fetch
+            await new Promise(r => setTimeout(r, 50)); // simulate network delay
+            completed++;
+        }));
+    }
+
+    const end = Date.now();
+    console.log(`Concurrent loading took ${end - start}ms`);
+}
+
+benchmark();

dist/kantine.bundle.js

@@ -783,41 +783,51 @@ async function loadMenuDataFromAPI() {
         const allDays = [];
         let completed = 0;
 
-        for (const dateObj of availableDates) {
+        const BATCH_SIZE = 5;
-            const dateStr = dateObj.date;
+        for (let i = 0; i < totalDates; i += BATCH_SIZE) {
-            const pct = Math.round(((completed + 1) / totalDates) * 100);
+            const batch = availableDates.slice(i, i + BATCH_SIZE);
-            progressFill.style.width = `${pct}%`;
+            const results = await Promise.all(batch.map(async (dateObj) => {
-            progressPercent.textContent = `${pct}%`;
+                const dateStr = dateObj.date;
-            progressMessage.textContent = `Lade Menü für ${dateStr}...`;
+                let dayData = null;
+                try {
+                    const detailResp = await fetch(`${_constants_js__WEBPACK_IMPORTED_MODULE_2__/* .API_BASE */ .tE}/venues/${_constants_js__WEBPACK_IMPORTED_MODULE_2__/* .VENUE_ID */ .eW}/menu/${_constants_js__WEBPACK_IMPORTED_MODULE_2__/* .MENU_ID */ .YU}/${dateStr}/`, {
+                        headers: (0,_api_js__WEBPACK_IMPORTED_MODULE_3__/* .apiHeaders */ .H)(token)
+                    });
 
-            try {
+                    if (detailResp.ok) {
-                const detailResp = await fetch(`${_constants_js__WEBPACK_IMPORTED_MODULE_2__/* .API_BASE */ .tE}/venues/${_constants_js__WEBPACK_IMPORTED_MODULE_2__/* .VENUE_ID */ .eW}/menu/${_constants_js__WEBPACK_IMPORTED_MODULE_2__/* .MENU_ID */ .YU}/${dateStr}/`, {
+                        const detailData = await detailResp.json();
-                    headers: (0,_api_js__WEBPACK_IMPORTED_MODULE_3__/* .apiHeaders */ .H)(token)
+                        const menuGroups = detailData.results || [];
-                });
+                        let dayItems = [];
-
+                        for (const group of menuGroups) {
-                if (detailResp.ok) {
+                            if (group.items && Array.isArray(group.items)) {
-                    const detailData = await detailResp.json();
+                                dayItems = dayItems.concat(group.items);
-                    const menuGroups = detailData.results || [];
+                            }
-                    let dayItems = [];
+                        }
-                    for (const group of menuGroups) {
+                        if (dayItems.length > 0) {
-                        if (group.items && Array.isArray(group.items)) {
+                            dayData = {
-                            dayItems = dayItems.concat(group.items);
+                                date: dateStr,
+                                menu_items: dayItems,
+                                orders: dateObj.orders || []
+                            };
                         }
                     }
-                    if (dayItems.length > 0) {
+                } catch (err) {
-                        allDays.push({
+                    console.error(`Failed to fetch details for ${dateStr}:`, err);
-                            date: dateStr,
+                } finally {
-                            menu_items: dayItems,
+                    completed++;
-                            orders: dateObj.orders || []
+                    const pct = Math.round((completed / totalDates) * 100);
-                        });
+                    progressFill.style.width = `${pct}%`;
-                    }
+                    progressPercent.textContent = `${pct}%`;
+                    progressMessage.textContent = `Lade Menü für ${dateStr}...`;
                 }
-            } catch (err) {
+                return dayData;
-                console.error(`Failed to fetch details for ${dateStr}:`, err);
+            }));
-            }
 
-            completed++;
+            for (const result of results) {
-            await new Promise(r => setTimeout(r, 100));
+                if (result) {
+                    allDays.push(result);
+                }
+            }
         }
 
         const weeksMap = new Map();

src/actions.js

@@ -752,41 +752,51 @@ export async function loadMenuDataFromAPI() {
         const allDays = [];
         let completed = 0;
 
-        for (const dateObj of availableDates) {
+        const BATCH_SIZE = 5;
-            const dateStr = dateObj.date;
+        for (let i = 0; i < totalDates; i += BATCH_SIZE) {
-            const pct = Math.round(((completed + 1) / totalDates) * 100);
+            const batch = availableDates.slice(i, i + BATCH_SIZE);
-            progressFill.style.width = `${pct}%`;
+            const results = await Promise.all(batch.map(async (dateObj) => {
-            progressPercent.textContent = `${pct}%`;
+                const dateStr = dateObj.date;
-            progressMessage.textContent = `Lade Menü für ${dateStr}...`;
+                let dayData = null;
+                try {
+                    const detailResp = await fetch(`${API_BASE}/venues/${VENUE_ID}/menu/${MENU_ID}/${dateStr}/`, {
+                        headers: apiHeaders(token)
+                    });
 
-            try {
+                    if (detailResp.ok) {
-                const detailResp = await fetch(`${API_BASE}/venues/${VENUE_ID}/menu/${MENU_ID}/${dateStr}/`, {
+                        const detailData = await detailResp.json();
-                    headers: apiHeaders(token)
+                        const menuGroups = detailData.results || [];
-                });
+                        let dayItems = [];
-
+                        for (const group of menuGroups) {
-                if (detailResp.ok) {
+                            if (group.items && Array.isArray(group.items)) {
-                    const detailData = await detailResp.json();
+                                dayItems = dayItems.concat(group.items);
-                    const menuGroups = detailData.results || [];
+                            }
-                    let dayItems = [];
+                        }
-                    for (const group of menuGroups) {
+                        if (dayItems.length > 0) {
-                        if (group.items && Array.isArray(group.items)) {
+                            dayData = {
-                            dayItems = dayItems.concat(group.items);
+                                date: dateStr,
+                                menu_items: dayItems,
+                                orders: dateObj.orders || []
+                            };
                         }
                     }
-                    if (dayItems.length > 0) {
+                } catch (err) {
-                        allDays.push({
+                    console.error(`Failed to fetch details for ${dateStr}:`, err);
-                            date: dateStr,
+                } finally {
-                            menu_items: dayItems,
+                    completed++;
-                            orders: dateObj.orders || []
+                    const pct = Math.round((completed / totalDates) * 100);
-                        });
+                    progressFill.style.width = `${pct}%`;
-                    }
+                    progressPercent.textContent = `${pct}%`;
+                    progressMessage.textContent = `Lade Menü für ${dateStr}...`;
                 }
-            } catch (err) {
+                return dayData;
-                console.error(`Failed to fetch details for ${dateStr}:`, err);
+            }));
-            }
 
-            completed++;
+            for (const result of results) {
-            await new Promise(r => setTimeout(r, 100));
+                if (result) {
+                    allDays.push(result);
+                }
+            }
         }
 
         const weeksMap = new Map();