Return sessionIds & nextSessionIds in staking.info (#1272)

* Return sessionIds & nextSessionIds in staking.info

* Simplify

packages/api-derive/src/staking/info.ts

@@ -84,27 +84,32 @@ function redeemableSum (stakingLedger: StakingLedger | undefined, eraLength: BN,
     );
 }
 
-function unwrapSessionIds (stashId: AccountId, queuedKeys: Option<AccountId> | Vec<[AccountId, Keys] & Codec>, nextKeys: Option<Keys>): { nextSessionId?: AccountId; sessionId?: AccountId } {
+function unwrapSessionIds (stashId: AccountId, queuedKeys: Option<AccountId> | Vec<[AccountId, Keys] & Codec>, nextKeys: Option<Keys>): { nextSessionIds: AccountId[]; nextSessionId?: AccountId; sessionIds: AccountId[]; sessionId?: AccountId } {
   // for 2.x we have a Vec<(ValidatorId,Keys)> of the keys
   if (Array.isArray(queuedKeys)) {
-    const [, { ed25519: sessionId }] = queuedKeys.find(([currentId]): boolean => currentId.eq(stashId)) || [undefined, { ed25519: undefined }];
+    const sessionIds = (queuedKeys.find(([currentId]): boolean => currentId.eq(stashId)) || [undefined, { toArray: (): AccountId[] => [] }])[1].toArray() as AccountId[];
+    const nextSessionIds = nextKeys.isSome
+      ? nextKeys.unwrap().toArray() as AccountId[]
+      : [];
 
     return {
-      nextSessionId: nextKeys.isSome
-        ? nextKeys.unwrap().ed25519
-        : undefined,
-      sessionId
+      nextSessionId: nextSessionIds[0],
+      nextSessionIds,
+      sessionId: sessionIds[0],
+      sessionIds
     };
   }
 
   // substrate 1.x
-  const nextSessionId = queuedKeys.isSome
-    ? queuedKeys.unwrap()
-    : undefined;
+  const nextSessionIds = queuedKeys.isSome
+    ? [queuedKeys.unwrap()]
+    : [];
 
   return {
-    nextSessionId,
-    sessionId: nextSessionId
+    nextSessionId: nextSessionIds[0],
+    nextSessionIds,
+    sessionId: nextSessionIds[0],
+    sessionIds: nextSessionIds
   };
 }
 
@@ -177,7 +182,7 @@ export function info (api: ApiInterfaceRx): (_accountId: Uint8Array | string) =>
           ? retrieveInfo(api, accountId, controllerId.unwrap())
           : stakingLedger.isSome
             ? retrieveInfo(api, stakingLedger.unwrap().stash, accountId)
-            : of({ accountId })
+            : of({ accountId, nextSessionIds: [], sessionIds: [] })
       ),
       drr()
     );

packages/api-derive/src/types.ts

@@ -95,11 +95,15 @@ export interface DerivedStakingOnlineStatus {
 export interface DerivedStaking extends DerivedStakingOnlineStatus {
   accountId: AccountId;
   controllerId?: AccountId;
+  // @deprecated Use nextSessionIds instead
   nextSessionId?: AccountId;
+  nextSessionIds: AccountId[];
   nominators?: AccountId[];
   redeemable?: BN;
   rewardDestination?: RewardDestination;
+  // @deprecated Use sessionIds instead
   sessionId?: AccountId;
+  sessionIds: AccountId[];
   stakers?: Exposure;
   stakingLedger?: StakingLedger;
   stashId?: AccountId;