fix: PortfolioView: Selector to determine networks to poll (#28502)

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## **Related issues**

Fixes:

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ui/selectors/selectors.js

@@ -2196,6 +2196,58 @@ export const getAllEnabledNetworks = createDeepEqualSelector(
     ),
 );
 
+export const getChainIdsToPoll = createDeepEqualSelector(
+  getPreferences,
+  getNetworkConfigurationsByChainId,
+  getCurrentChainId,
+  (preferences, networkConfigurations, currentChainId) => {
+    const { pausedChainIds = [] } = preferences;
+
+    if (!process.env.PORTFOLIO_VIEW) {
+      return [currentChainId];
+    }
+
+    return Object.keys(networkConfigurations).filter(
+      (chainId) =>
+        !TEST_CHAINS.includes(chainId) && !pausedChainIds.includes(chainId),
+    );
+  },
+);
+
+export const getNetworkClientIdsToPoll = createDeepEqualSelector(
+  getPreferences,
+  getNetworkConfigurationsByChainId,
+  getCurrentChainId,
+  (preferences, networkConfigurations, currentChainId) => {
+    const { pausedChainIds = [] } = preferences;
+
+    if (!process.env.PORTFOLIO_VIEW) {
+      const networkConfiguration = networkConfigurations[currentChainId];
+      return [
+        networkConfiguration.rpcEndpoints[
+          networkConfiguration.defaultRpcEndpointIndex
+        ].networkClientId,
+      ];
+    }
+
+    return Object.entries(networkConfigurations).reduce(
+      (acc, [chainId, network]) => {
+        if (
+          !TEST_CHAINS.includes(chainId) &&
+          !pausedChainIds.includes(chainId)
+        ) {
+          acc.push(
+            network.rpcEndpoints[network.defaultRpcEndpointIndex]
+              .networkClientId,
+          );
+        }
+        return acc;
+      },
+      [],
+    );
+  },
+);
+
 /**
  *  To retrieve the maxBaseFee and priorityFee the user has set as default
  *

ui/selectors/selectors.test.js

@@ -838,6 +838,123 @@ describe('Selectors', () => {
     });
   });
 
+  describe('#getChainIdsToPoll', () => {
+    const networkConfigurationsByChainId = {
+      [CHAIN_IDS.MAINNET]: {
+        chainId: CHAIN_IDS.MAINNET,
+        defaultRpcEndpointIndex: 0,
+        rpcEndpoints: [{ networkClientId: 'mainnet' }],
+      },
+      [CHAIN_IDS.LINEA_MAINNET]: {
+        chainId: CHAIN_IDS.LINEA_MAINNET,
+        defaultRpcEndpointIndex: 0,
+        rpcEndpoints: [{ networkClientId: 'linea-mainnet' }],
+      },
+      [CHAIN_IDS.SEPOLIA]: {
+        chainId: CHAIN_IDS.SEPOLIA,
+        defaultRpcEndpointIndex: 0,
+        rpcEndpoints: [{ networkClientId: 'sepolia' }],
+      },
+      [CHAIN_IDS.LINEA_SEPOLIA]: {
+        chainId: CHAIN_IDS.LINEA_SEPOLIA,
+        defaultRpcEndpointIndex: 0,
+        rpcEndpoints: [{ networkClientId: 'linea-sepolia' }],
+      },
+    };
+
+    beforeEach(() => {
+      process.env.PORTFOLIO_VIEW = 'true';
+    });
+
+    afterEach(() => {
+      process.env.PORTFOLIO_VIEW = undefined;
+    });
+
+    it('returns only non-test chain IDs', () => {
+      const chainIds = selectors.getChainIdsToPoll({
+        metamask: {
+          preferences: { pausedChainIds: [] },
+          networkConfigurationsByChainId,
+          selectedNetworkClientId: 'mainnet',
+        },
+      });
+      expect(Object.values(chainIds)).toHaveLength(2);
+      expect(chainIds).toStrictEqual([
+        CHAIN_IDS.MAINNET,
+        CHAIN_IDS.LINEA_MAINNET,
+      ]);
+    });
+
+    it('does not return paused chain IDs', () => {
+      const chainIds = selectors.getChainIdsToPoll({
+        metamask: {
+          preferences: { pausedChainIds: [CHAIN_IDS.LINEA_MAINNET] },
+          networkConfigurationsByChainId,
+          selectedNetworkClientId: 'mainnet',
+        },
+      });
+      expect(Object.values(chainIds)).toHaveLength(1);
+      expect(chainIds).toStrictEqual([CHAIN_IDS.MAINNET]);
+    });
+  });
+
+  describe('#getNetworkClientIdsToPoll', () => {
+    const networkConfigurationsByChainId = {
+      [CHAIN_IDS.MAINNET]: {
+        chainId: CHAIN_IDS.MAINNET,
+        defaultRpcEndpointIndex: 0,
+        rpcEndpoints: [{ networkClientId: 'mainnet' }],
+      },
+      [CHAIN_IDS.LINEA_MAINNET]: {
+        chainId: CHAIN_IDS.LINEA_MAINNET,
+        defaultRpcEndpointIndex: 0,
+        rpcEndpoints: [{ networkClientId: 'linea-mainnet' }],
+      },
+      [CHAIN_IDS.SEPOLIA]: {
+        chainId: CHAIN_IDS.SEPOLIA,
+        defaultRpcEndpointIndex: 0,
+        rpcEndpoints: [{ networkClientId: 'sepolia' }],
+      },
+      [CHAIN_IDS.LINEA_SEPOLIA]: {
+        chainId: CHAIN_IDS.LINEA_SEPOLIA,
+        defaultRpcEndpointIndex: 0,
+        rpcEndpoints: [{ networkClientId: 'linea-sepolia' }],
+      },
+    };
+
+    beforeEach(() => {
+      process.env.PORTFOLIO_VIEW = 'true';
+    });
+
+    afterEach(() => {
+      process.env.PORTFOLIO_VIEW = undefined;
+    });
+
+    it('returns only non-test chain IDs', () => {
+      const chainIds = selectors.getNetworkClientIdsToPoll({
+        metamask: {
+          preferences: { pausedChainIds: [] },
+          networkConfigurationsByChainId,
+          selectedNetworkClientId: 'mainnet',
+        },
+      });
+      expect(Object.values(chainIds)).toHaveLength(2);
+      expect(chainIds).toStrictEqual(['mainnet', 'linea-mainnet']);
+    });
+
+    it('does not return paused chain IDs', () => {
+      const chainIds = selectors.getNetworkClientIdsToPoll({
+        metamask: {
+          preferences: { pausedChainIds: [CHAIN_IDS.LINEA_MAINNET] },
+          networkConfigurationsByChainId,
+          selectedNetworkClientId: 'mainnet',
+        },
+      });
+      expect(Object.values(chainIds)).toHaveLength(1);
+      expect(chainIds).toStrictEqual(['mainnet']);
+    });
+  });
+
   describe('#isHardwareWallet', () => {
     it('returns false if it is not a HW wallet', () => {
       const mockStateWithImported = modifyStateWithHWKeyring(