BRE-342 Implement retry mechanism with error handling to get secrets from KV (#329)

* BRE-342 DEBUG: Print error message for debuging purposes

* BRE-342 REFACTOR: Error message while downloading secret

* BRE-342 ADD: retry mechanism with error handling for null/undefined responses in getSecretValue to prevent failures and retry up to 3 times with a delay

* BRE-342 REFACTOR: Increase RETRY_DELAY

* BRE-342 REFACTOR: Added retry logic to getSecretValue to handle both response and apiResult errors

* BRE-342 REFACTOR: retry logic in getSecretValue by extracting repetitive code into a helper function for cleaner retries

Author: urbinaalex17

get-keyvault-secrets/lib/KeyVaultClient.js

@@ -122,11 +122,25 @@ class KeyVaultClient extends AzureRestClient_1.ServiceClient {
             }
         })).then((apiResult) => callback(apiResult.error, apiResult.result), (error) => callback(error));
     }
-    getSecretValue(secretName, callback) {
+    getSecretValue(secretName, callback, attempt = 1) {
+        const MAX_RETRY_ATTEMPTS = 3; // Define the maximum number of retry attempts
+        const RETRY_DELAY = 3000; // Define the delay between retries in milliseconds
         if (!callback) {
             core.debug("Callback Cannot Be Null");
             throw new Error("Callback Cannot Be Null");
         }
+        // Helper function to handle retries
+        const retryRequest = (reason) => {
+            if (attempt < MAX_RETRY_ATTEMPTS) {
+                core.debug(`Retrying... Attempt ${attempt + 1} due to: ${reason}`);
+                setTimeout(() => {
+                    this.getSecretValue(secretName, callback, attempt + 1); // Retry the request
+                }, RETRY_DELAY);
+            } else {
+                callback(new Error(`${reason} after max retries`), null); // If max retries reached, pass the error
+            }
+        };
+
         // Create HTTP transport objects
         var httpRequest = {
             method: 'GET',
@@ -136,17 +150,32 @@ class KeyVaultClient extends AzureRestClient_1.ServiceClient {
             }, [], this.apiVersion)
         };
         this.invokeRequest(httpRequest).then((response) => __awaiter(this, void 0, void 0, function* () {
-            if (response.statusCode == 200) {
-                var result = response.body.value;
-                return new AzureRestClient_1.ApiResult(null, result);
-            }
-            else if (response.statusCode == 400) {
-                return new AzureRestClient_1.ApiResult('Get Secret Failed Because Of Invalid Characters', secretName);
+            try {
+                if (!response || response.statusCode == null) {
+                    throw new Error("Response or statusCode is null");
+                }
+                if (response.statusCode == 200) {
+                    var result = response.body.value;
+                    return new AzureRestClient_1.ApiResult(null, result);
+                } else if (response.statusCode == 400) {
+                    return new AzureRestClient_1.ApiResult('Get Secret Failed Because Of Invalid Characters', secretName);
+                } else {
+                    return new AzureRestClient_1.ApiResult((0, AzureRestClient_1.ToError)(response));
+                }
+            } catch (error) {
+                retryRequest(error.message); // Retry on error
             }
-            else {
-                return new AzureRestClient_1.ApiResult((0, AzureRestClient_1.ToError)(response));
+        })).then((apiResult) => {
+            if (apiResult && apiResult.error) {
+                retryRequest(apiResult.error.message); // Retry on apiResult error
+            } else if (apiResult && typeof apiResult.result !== 'undefined') {
+                callback(null, apiResult.result); // No error, pass the result
+            } else {
+                retryRequest("Unexpected result format"); // Retry on unexpected result format
             }
-        })).then((apiResult) => callback(apiResult.error, apiResult.result), (error) => callback(error));
+        }, (error) => {
+            retryRequest(error.message); // Retry on promise rejection
+        });
     }
     convertToAzureKeyVaults(result) {
         var listOfSecrets = [];

get-keyvault-secrets/lib/KeyVaultHelper.js

@@ -106,6 +106,7 @@ class KeyVaultHelper {
         return new Promise((resolve, reject) => {
             this.keyVaultClient.getSecretValue(secretName, (error, secretValue) => {
                 if (error) {
+                    console.log(util.format("Error: %s", this.getError(error)));
                     core.setFailed(util.format("Could not download the secret %s", secretName));
                 }
                 else {