route53: retry on rate limit

route53 has a limit of 5 req/sec/region - https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/DNSLimitations.html#limits-api-requests

see https://forum.cloudron.io/topic/10656/improve-dns-updates-to-avoid-rate-limits/

CHANGES

@@ -2722,3 +2722,5 @@
 
 [7.6.3]
 * postgres: do not clear search_path for restore
+* route53: retry on rate limit errors
+

src/dns/route53.js

@@ -39,7 +39,12 @@ function getDnsCredentials(domainConfig) {
     const credentials = {
         accessKeyId: domainConfig.accessKeyId,
         secretAccessKey: domainConfig.secretAccessKey,
-        region: domainConfig.region
+        region: domainConfig.region,
+        maxRetries: 20,
+        // route53 has a limit of 5 req/sec/region - https://docs.aws.amazon.com/Route53/latest/DeveloperGuide/DNSLimitations.html#limits-api-requests
+        retryDelayOptions: {
+            customBackoff: (/* retryCount, error */) => 3000 // constant backoff - https://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/Config.html#retryDelayOptions-property
+        },
     };
 
     if (domainConfig.endpoint) credentials.endpoint = new AWS.Endpoint(domainConfig.endpoint);