fix: update eraElectionStatus for runtime upgrade v30

docs/src/openapi-v1.yaml

@@ -1309,6 +1309,8 @@ components:
         status:
           type: object
           description: >-
+            [Deprecated](Works for polkadot runtimes before v0.8.30).   
+
             Era election status: either `Close: null` or `Open: <BlockNumber>`.
             A status of `Close` indicates that the submission window for solutions
             from off-chain Phragmen is not open. A status of `Open` indicates that the

src/services/pallets/PalletsStakingProgressService.ts

@@ -20,17 +20,26 @@ export class PalletsStakingProgressService extends AbstractService {
 		const [
 			validatorCount,
 			forceEra,
-			eraElectionStatus,
 			validators,
 			{ number },
 		] = await Promise.all([
 			api.query.staking.validatorCount.at(hash),
 			api.query.staking.forceEra.at(hash),
-			api.query.staking.eraElectionStatus.at(hash),
 			api.query.session.validators.at(hash),
 			api.rpc.chain.getHeader(hash),
 		]);
 
+		let eraElectionStatus;
+		/**
+		 * Polkadot runtimes v0.8.30 and above do not support eraElectionStatus, so we check
+		 * to see if eraElectionStatus is mounted to the api, and if were running on a
+		 * runtime less than v0.8.30 it will return a successful result. If it doesn't
+		 * we do nothing and let `eraElectionStatus` stay undefined.
+		 */
+		if (api.query.staking.eraElectionStatus) {
+			eraElectionStatus = await api.query.staking.eraElectionStatus.at(hash);
+		}
+
 		const {
 			eraLength,
 			eraProgress,
@@ -88,7 +97,7 @@ export class PalletsStakingProgressService extends AbstractService {
 		if (electionLookAhead.eq(new BN(0))) {
 			// no offchain solutions accepted
 			toggle = null;
-		} else if ((eraElectionStatus as { isClose?: boolean }).isClose) {
+		} else if ((eraElectionStatus as { isClose?: boolean })?.isClose) {
 			// election window is yet to open
 			toggle = nextCurrentEra.sub(electionLookAhead);
 		} else {
@@ -99,10 +108,12 @@ export class PalletsStakingProgressService extends AbstractService {
 		return {
 			...baseResponse,
 			nextActiveEraEstimate: nextActiveEra.toString(10),
-			electionStatus: {
-				status: eraElectionStatus.toJSON(),
-				toggleEstimate: toggle?.toString(10) ?? null,
-			},
+			electionStatus: eraElectionStatus
+				? {
+						status: eraElectionStatus.toJSON(),
+						toggleEstimate: toggle?.toString(10) ?? null,
+				  }
+				: 'Deprecated, see docs',
 			idealValidatorCount: validatorCount.toString(10),
 			validatorSet: validators.map((accountId) => accountId.toString()),
 		};

src/types/responses/PalletStakingProgress.ts

@@ -10,9 +10,11 @@ export interface IPalletStakingProgress {
 	nextActiveEraEstimate?: AnyJson;
 	nextSessionEstimate: string | null;
 	unappliedSlashes: AnyJson[] | null;
-	electionStatus?: {
-		status: AnyJson;
-		toggleEstimate: string | null;
-	};
+	electionStatus?:
+		| {
+				status: AnyJson;
+				toggleEstimate: string | null;
+		  }
+		| string;
 	validatorSet?: string[] | null;
 }