Subscribe to chains by genesis hash (#395)

* Handle subscription by hash in the frontend

* Forward-ported backend changes

* Fix unit tests

* Remove unused `chains_by_label`

* fmt

* Updated but failing E2E tests

* subscribe by genesis hash in tests

* fmt

* Copy `BlockHash` instead of returning a ref

* Pin chains by genesisHash

Co-authored-by: James Wilson <james@jsdw.me>

frontend/src/state.ts

@@ -19,8 +19,10 @@ import { Types, Maybe, SortedCollection } from './common';
 import { Column } from './components/List';
 
 export const PINNED_CHAINS = {
-  Kusama: 2,
-  Polkadot: 1,
+  // Kusama
+  '0xb0a8d493285c2df73290dfb7e61f870f17b41801197a149ca93654499ea3dafe': 2,
+  // Polkadot
+  '0x91b171bb158e2d3848fa23a9f1c25182fb8e20313b2c1eb49219da7a70ce90c3': 1,
 };
 
 export function comparePinnedChains(a: string, b: string) {
@@ -275,8 +277,8 @@ export interface State {
   blockTimestamp: Types.Timestamp;
   blockAverage: Maybe<Types.Milliseconds>;
   timeDiff: Types.Milliseconds;
-  subscribed: Maybe<Types.ChainLabel>;
-  chains: Map<Types.ChainLabel, ChainData>;
+  subscribed: Maybe<Types.GenesisHash>;
+  chains: Map<Types.GenesisHash, ChainData>;
   nodes: SortedCollection<Node>;
   settings: Readonly<State.Settings>;
   pins: Readonly<Set<Types.NodeName>>;
@@ -290,5 +292,6 @@ export type Update = <K extends keyof State>(
 
 export interface ChainData {
   label: Types.ChainLabel;
+  genesisHash: Types.GenesisHash;
   nodeCount: Types.NodeCount;
 }