added apiRuntimeCache

usps_api_bridge.php

@@ -8,6 +8,9 @@ use Symfony\Component\HttpClient\HttpClient;
 
 class Usps_Api_Bridge extends Module
 {
+    // Runtime cache to prevent duplicate API calls during a single page load
+    private $apiRuntimeCache = [];
+
     public function __construct()
     {
         $this->name = 'usps_api_bridge';
@@ -139,7 +142,7 @@ class Usps_Api_Bridge extends Module
         return $helper->generateForm([$fields_form]);
     }
 
-public function calculateRate($params, $shipping_cost, $products, $originalModule)
+    public function calculateRate($params, $shipping_cost, $products, $originalModule)
     {
         require_once(dirname(__FILE__) . '/classes/UspsV3Client.php');
 
@@ -155,7 +158,7 @@ public function calculateRate($params, $shipping_cost, $products, $originalModul
         $methodCode = Db::getInstance()->getValue($sql);
 
         if (!$methodCode) {
-            return false; 
+            return false;
         }
 
         // 3. Map Old Code to New API Enum
@@ -166,7 +169,7 @@ public function calculateRate($params, $shipping_cost, $products, $originalModul
 
         // 4. Pack Products
         $packedBoxes = $originalModule->getHelper()->getCarrierHelper()->packProducts($products, $params->id);
-        
+
         if (empty($packedBoxes)) {
             $this->log("Box packer returned empty.");
             return false;
@@ -184,20 +187,20 @@ public function calculateRate($params, $shipping_cost, $products, $originalModul
         // 6. Address Data
         $originZip = $this->getOriginZip($originalModule);
         $destAddress = new Address($params->id_address_delivery);
-        
+
         $originZip = substr(preg_replace('/[^0-9]/', '', $originZip), 0, 5);
         $destZip = substr(preg_replace('/[^0-9]/', '', $destAddress->postcode), 0, 5);
         $isInternational = ($destAddress->id_country != Country::getByIso('US'));
 
         // 7. Loop through boxes
         foreach ($packedBoxes as $packedBox) {
-            
+
             // Weight (Lbs) - Ensure minimum 0.1
             $weightInLbs = $this->convertUnit($packedBox->getWeight(), 'g', 'lbs', 3);
             if ($weightInLbs < 0.1) $weightInLbs = 0.1;
 
             // Dimensions (Inches)
-            $box = $packedBox->getBox(); 
+            $box = $packedBox->getBox();
             $length = $this->convertUnit($box->getOuterLength(), 'mm', 'in', 2);
             $width = $this->convertUnit($box->getOuterWidth(), 'mm', 'in', 2);
             $height = $this->convertUnit($box->getOuterDepth(), 'mm', 'in', 2);
@@ -259,24 +262,65 @@ public function calculateRate($params, $shipping_cost, $products, $originalModul
     }
 
     /**
-     * Helper to send request and handle Domestic vs International switching
+     * Helper to send request with Runtime Caching & Domestic/Intl switching
      */
     private function sendApiRequest($client, $payload, $isInternational, $destAddress, $destZip)
     {
+        // 1. Prepare the specific payload for the cache key
+        // We simulate the modifications we are about to do to ensure the key is accurate
+        $cachePayload = $payload;
+
         if ($isInternational) {
-            $payload['destinationCountryCode'] = Country::getIsoById($destAddress->id_country);
-            // Cleanup domestic fields
-            unset($payload['destinationEntryFacilityType']);
-            unset($payload['destinationZIPCode']);
-            
-            return $client->getInternationalRate($payload);
-        } 
-        
-        // Domestic
-        $payload['destinationZIPCode'] = $destZip;
-        $payload['destinationEntryFacilityType'] = 'NONE';
-        
-        return $client->getDomesticRate($payload);
+            $cachePayload['destinationCountryCode'] = Country::getIsoById($destAddress->id_country);
+            $cachePayload['originZIPCode'] = $payload['originZIPCode']; // Ensure consistency
+            unset($cachePayload['destinationEntryFacilityType']);
+            unset($cachePayload['destinationZIPCode']);
+            $endpointType = 'INT';
+        } else {
+            $cachePayload['destinationZIPCode'] = $destZip;
+            $cachePayload['destinationEntryFacilityType'] = 'NONE';
+            $endpointType = 'DOM';
+        }
+
+        // 2. Generate Hash
+        // We include the endpoint type to ensure uniqueness
+        $cacheKey = md5(json_encode($cachePayload) . $endpointType);
+
+        // 3. Check Cache
+        if (isset($this->apiRuntimeCache[$cacheKey])) {
+            // Uncomment for deep debugging if needed
+            // $this->log("Returning cached rate for key: " . $cacheKey); 
+            return $this->apiRuntimeCache[$cacheKey];
+        }
+
+        // 4. Perform Request
+        if ($isInternational) {
+            $response = $client->getInternationalRate($cachePayload);
+        } else {
+            $response = $client->getDomesticRate($cachePayload);
+        }
+
+        // 5. Determine if we should cache
+        // We DO cache API errors (like 400 Bad Request) because retrying them won't fix invalid data.
+        // We DO NOT cache Network/Transport errors (timeouts) so they can be retried.
+        $shouldCache = true;
+
+        if (isset($response['error'])) {
+            // Check for Guzzle/Symfony Transport errors strings defined in UspsV3Client
+            if (
+                strpos($response['error'], 'Network') !== false ||
+                strpos($response['error'], 'Connection') !== false ||
+                strpos($response['error'], 'Transport') !== false
+            ) {
+                $shouldCache = false;
+            }
+        }
+
+        if ($shouldCache) {
+            $this->apiRuntimeCache[$cacheKey] = $response;
+        }
+
+        return $response;
     }
 
     /**