Fix pricechart if no price/historical data available.

basicswap/basicswap.py

@@ -12592,6 +12592,7 @@ class BasicSwap(BaseApp, BSXNetwork, UIApp):
                 return return_data
 
             if rate_source == "coingecko.com":
+                try:
                     coin_ids: str = ""
                     for coin_id in coins_list:
                         if len(coin_ids) > 0:
@@ -12620,9 +12621,13 @@ class BasicSwap(BaseApp, BSXNetwork, UIApp):
                         price_change_24h = v.get("usd_24h_change")
 
                         # Convert to float if value exists, otherwise keep as None
-                    volume_value = float(volume_24h) if volume_24h is not None else None
+                        volume_value = (
+                            float(volume_24h) if volume_24h is not None else None
+                        )
                         price_change_value = (
-                        float(price_change_24h) if price_change_24h is not None else 0.0
+                            float(price_change_24h)
+                            if price_change_24h is not None
+                            else 0.0
                         )
 
                         return_data[coin_id] = {
@@ -12633,6 +12638,13 @@ class BasicSwap(BaseApp, BSXNetwork, UIApp):
                             "volume_24h": volume_value,
                             "price_change_24h": price_change_value,
                         }
+                except Exception as e:
+                    self.log.warning(f"Could not fetch volume data: {e}")
+                    for coin_id in need_coins:
+                        return_data[coin_id] = {
+                            "volume_24h": None,
+                            "price_change_24h": 0.0,
+                        }
             else:
                 raise ValueError(f"Unknown rate source {rate_source}")
 
@@ -12723,6 +12735,7 @@ class BasicSwap(BaseApp, BSXNetwork, UIApp):
                 )
 
                 for coin_id in need_coins:
+                    try:
                         exchange_name: str = self.getExchangeName(coin_id, rate_source)
                         url: str = (
                             f"https://api.coingecko.com/api/v3/coins/{exchange_name}/market_chart?vs_currency=usd&days={days}"
@@ -12735,6 +12748,11 @@ class BasicSwap(BaseApp, BSXNetwork, UIApp):
                         if "prices" in js:
                             return_data[coin_id] = js["prices"]
                             new_values[coin_id] = js["prices"]
+                    except Exception as e:
+                        self.log.warning(
+                            f"Could not fetch historical data for {Coins(coin_id).name}: {e}"
+                        )
+                        return_data[coin_id] = []
             else:
                 raise ValueError(f"Unknown rate source {rate_source}")
 

basicswap/static/js/pages/offers-pricechart.js

@@ -866,8 +866,11 @@ destroyChart: function() {
           const allData = await api.fetchHistoricalDataXHR([coinSymbol]);
           data = allData[coinSymbol];
 
-          if (!data || Object.keys(data).length === 0) {
+          if (!data || (Array.isArray(data) && data.length === 0) || Object.keys(data).length === 0) {
-            throw new Error(`No data returned for ${coinSymbol}`);
+            console.warn(`No price data available for ${coinSymbol}`);
+            chartModule.hideChartLoader();
+            chartModule.showNoDataMessage(coinSymbol);
+            return;
           }
 
           CacheManager.set(cacheKey, data, 'chart');
@@ -897,6 +900,8 @@ destroyChart: function() {
         chartModule.initChart();
       }
 
+      chartModule.hideNoDataMessage();
+
       const chartData = chartModule.prepareChartData(coinSymbol, data);
       if (chartData.length > 0 && chartModule.chart) {
         chartModule.chart.data.datasets[0].data = chartData;
@@ -951,6 +956,41 @@ destroyChart: function() {
     chart.classList.remove('hidden');
   },
 
+  showNoDataMessage: function(coinSymbol) {
+    const chartCanvas = document.getElementById('coin-chart');
+    if (!chartCanvas) {
+      return;
+    }
+
+    if (this.chart) {
+      this.chart.data.datasets[0].data = [];
+      this.chart.update('none');
+    }
+
+    let messageDiv = document.getElementById('chart-no-data-message');
+    if (!messageDiv) {
+      messageDiv = document.createElement('div');
+      messageDiv.id = 'chart-no-data-message';
+      messageDiv.style.cssText = 'position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); text-align: center; color: #888; font-size: 14px; z-index: 10;';
+      chartCanvas.parentElement.style.position = 'relative';
+      chartCanvas.parentElement.appendChild(messageDiv);
+    }
+
+    messageDiv.innerHTML = `
+      <div style="padding: 20px; background: rgba(0,0,0,0.05); border-radius: 8px;">
+        <div style="font-size: 16px; margin-bottom: 8px;">No Price Data Available</div>
+      </div>
+    `;
+    messageDiv.classList.remove('hidden');
+  },
+
+  hideNoDataMessage: function() {
+    const messageDiv = document.getElementById('chart-no-data-message');
+    if (messageDiv) {
+      messageDiv.classList.add('hidden');
+    }
+  },
+
   cleanup: function() {
   if (this.pendingAnimationFrame) {
     cancelAnimationFrame(this.pendingAnimationFrame);