/**
* Loads the security group to be shared between nodes in the same application in the given
* Location. If no such security group exists it is created.
*
* @param location The location in which the security group will be found
* @param securityApi The API to use to list and create security groups
* @return the security group to share between instances in the given location in this application
*/
private SecurityGroup getOrCreateSharedSecurityGroup(
Location location, SecurityGroupExtension securityApi) {
final String groupName = getNameForSharedSecurityGroup();
// Could sort-and-search if straight search is too expensive
Optional<SecurityGroup> shared =
Iterables.tryFind(
securityApi.listSecurityGroupsInLocation(location),
new Predicate<SecurityGroup>() {
@Override
public boolean apply(final SecurityGroup input) {
// endsWith because Jclouds prepends 'jclouds#' to security group names.
return input.getName().endsWith(groupName);
}
});
if (shared.isPresent()) {
LOG.info(
"Found existing shared security group in {} for app {}: {}",
new Object[] {location, applicationId, groupName});
return shared.get();
} else {
LOG.info(
"Creating new shared security group in {} for app {}: {}",
new Object[] {location, applicationId, groupName});
return createBaseSecurityGroupInLocation(groupName, location, securityApi);
}
}
/**
* Loads the security groups attached to the node with the given ID and returns the group that is
* unique to the node, per the application context. This method will also update {@link
* #sharedGroupCache} if no mapping for the shared group's location previously existed (e.g.
* Brooklyn was restarted and rebound to an existing application).
*
* <p>Notice that jclouds will attach 2 securityGroups to the node if the locationId is `aws-ec2`
* so it needs to look for the uniqueSecurityGroup rather than the shared securityGroup.
*
* @param nodeId The id of the node in question
* @param locationId The id of the location in question
* @param securityApi The API to use to list security groups
* @return the security group unique to the given node, or null if one could not be determined.
*/
private SecurityGroup getUniqueSecurityGroupForNodeCachingSharedGroupIfPreviouslyUnknown(
String nodeId, String locationId, SecurityGroupExtension securityApi) {
Set<SecurityGroup> groupsOnNode = securityApi.listSecurityGroupsForNode(nodeId);
if (groupsOnNode == null || groupsOnNode.isEmpty()) {
return null;
}
SecurityGroup unique;
if (locationId.equals("aws-ec2")) {
if (groupsOnNode.size() == 2) {
String expectedSharedName = getNameForSharedSecurityGroup();
Iterator<SecurityGroup> it = groupsOnNode.iterator();
SecurityGroup shared = it.next();
if (shared.getName().endsWith(expectedSharedName)) {
unique = it.next();
} else {
unique = shared;
shared = it.next();
}
if (!shared.getName().endsWith(expectedSharedName)) {
LOG.warn(
"Couldn't determine which security group is shared between instances in app {}. Expected={}, found={}",
new Object[] {applicationId, expectedSharedName, groupsOnNode});
return null;
}
// Shared entry might be missing if Brooklyn has rebound to an application
SecurityGroup old = sharedGroupCache.asMap().putIfAbsent(shared.getLocation(), shared);
LOG.info(
"Loaded unique security group for node {} (in {}): {}",
new Object[] {nodeId, applicationId, unique});
if (old == null) {
LOG.info("Proactively set shared group for app {} to: {}", applicationId, shared);
}
return unique;
} else {
LOG.warn(
"Expected to find two security groups on node {} in app {} (one shared, one unique). Found {}: {}",
new Object[] {nodeId, applicationId, groupsOnNode.size(), groupsOnNode});
}
}
return Iterables.getOnlyElement(groupsOnNode);
}