Improve how node roles are assigned in Garagev0.5-beta1

- change the terminology: the network configuration becomes the role
  table, the configuration of a nodes becomes a node's role
- the modification of the role table takes place in two steps: first,
  changes are staged in a CRDT data structure. Then, once the user is
  happy with the changes, they can commit them all at once (or revert
  them).
- update documentation
- fix tests
- implement smarter partition assignation algorithm

This patch breaks the format of the network configuration: when
migrating, the cluster will be in a state where no roles are assigned.
All roles must be re-assigned and commited at once. This migration
should not pose an issue.

1 files changed, 2 insertions, 2 deletions

diff --git a/src/garage/admin.rs b/src/garage/admin.rs
index c3a83d02..f0444988 100644
--- a/src/garage/admin.rs
+++ b/src/garage/admin.rs
@@ -339,7 +339,7 @@ impl AdminRpcHandler {
 
 			let mut failures = vec![];
 			let ring = self.garage.system.ring.borrow().clone();
-			for node in ring.config.members.keys() {
+			for node in ring.layout.node_ids().iter() {
 				let node = (*node).into();
 				let resp = self
 					.endpoint
@@ -383,7 +383,7 @@ impl AdminRpcHandler {
 			let mut ret = String::new();
 			let ring = self.garage.system.ring.borrow().clone();
 
-			for node in ring.config.members.keys() {
+			for node in ring.layout.node_ids().iter() {
 				let mut opt = opt.clone();
 				opt.all_nodes = false;