Prepare for v0.3.0 and add migration path from v0.2.1.x

src/rpc/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "garage_rpc"
-version = "0.2.1"
+version = "0.3.0"
 authors = ["Alex Auvolat <alex@adnab.me>"]
 edition = "2018"
 license = "AGPL-3.0"
@@ -13,7 +13,9 @@ path = "lib.rs"
 # See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
 
 [dependencies]
-garage_util = { version = "0.2.1", path = "../util" }
+garage_util = { version = "0.3.0", path = "../util" }
+
+garage_rpc_021 = { package = "garage_rpc", version = "0.2.1" }
 
 arc-swap = "1.0"
 bytes = "1.0"

src/rpc/membership.rs

@@ -240,11 +240,21 @@ impl System {
 		let net_config = match persist_config.load() {
 			Ok(x) => x,
 			Err(e) => {
-				info!(
-					"No valid previous network configuration stored ({}), starting fresh.",
-					e
-				);
-				NetworkConfig::new()
+				match Persister::<garage_rpc_021::ring::NetworkConfig>::new(
+					&metadata_dir,
+					"network_config",
+				)
+				.load()
+				{
+					Ok(old_config) => NetworkConfig::migrate_from_021(old_config),
+					Err(e2) => {
+						info!(
+							"No valid previous network configuration stored ({}, {}), starting fresh.",
+							e, e2
+						);
+						NetworkConfig::new()
+					}
+				}
 			}
 		};
 

src/rpc/ring.rs

@@ -38,6 +38,31 @@ impl NetworkConfig {
 			version: 0,
 		}
 	}
+
+	pub(crate) fn migrate_from_021(old: garage_rpc_021::ring::NetworkConfig) -> Self {
+		let members = old
+			.members
+			.into_iter()
+			.map(|(id, conf)| {
+				(
+					Hash::try_from(id.as_slice()).unwrap(),
+					NetworkConfigEntry {
+						zone: conf.datacenter,
+						capacity: if conf.capacity == 0 {
+							None
+						} else {
+							Some(conf.capacity)
+						},
+						tag: conf.tag,
+					},
+				)
+			})
+			.collect();
+		Self {
+			members,
+			version: old.version,
+		}
+	}
 }
 
 /// The overall configuration of one (possibly remote) node
@@ -178,8 +203,7 @@ impl Ring {
 								.iter()
 								.map(|(_id, info)| info.zone.as_str())
 								.collect::<HashSet<&str>>();
-							if (p_zns.len() < n_zones
-								&& !p_zns.contains(&node_info.zone.as_str()))
+							if (p_zns.len() < n_zones && !p_zns.contains(&node_info.zone.as_str()))
 								|| (p_zns.len() == n_zones
 									&& !partitions[qv].iter().any(|(id, _i)| id == node_id))
 							{