/**
* Rules of updating AmazonInfo: - instanceId must exist - localIp/privateIp most exist -
* publicHostname does not necessarily need to exist (e.g. in vpc)
*/
/* visible for testing */ static boolean shouldUpdate(AmazonInfo newInfo, AmazonInfo oldInfo) {
if (newInfo.getMetadata().isEmpty()) {
logger.warn("Newly resolved AmazonInfo is empty, skipping an update cycle");
} else if (!newInfo.equals(oldInfo)) {
if (isBlank(newInfo.get(MetaDataKey.instanceId))) {
logger.warn("instanceId is blank, skipping an update cycle");
return false;
} else if (isBlank(newInfo.get(MetaDataKey.localIpv4))) {
logger.warn("localIpv4 is blank, skipping an update cycle");
return false;
} else {
Set<String> newKeys = new HashSet<>(newInfo.getMetadata().keySet());
Set<String> oldKeys = new HashSet<>(oldInfo.getMetadata().keySet());
Set<String> union = new HashSet<>(newKeys);
union.retainAll(oldKeys);
newKeys.removeAll(union);
oldKeys.removeAll(union);
for (String key : newKeys) {
logger.info("Adding new metadata {}={}", key, newInfo.getMetadata().get(key));
}
for (String key : oldKeys) {
logger.info("Removing old metadata {}={}", key, oldInfo.getMetadata().get(key));
}
}
return true;
}
return false;
}
