Refresh BlockReward contract ERC balance without page reloading

apps/block_scout_web/assets/js/pages/address.js

@@ -70,6 +70,14 @@ export function reducer (state = initialState, action) {
   }
 }
 
+let fetchedTokenBalanceBlockNumber = 0;
+function loadTokenBalance(blockNumber) {
+  if (blockNumber > fetchedTokenBalanceBlockNumber) {
+    fetchedTokenBalanceBlockNumber = blockNumber
+    setTimeout(loadTokenBalanceDropdown, 1000)
+  }
+}
+
 const elements = {
   '[data-selector="channel-disconnected-message"]': {
     render ($el, state) {
@@ -83,7 +91,7 @@ const elements = {
     render ($el, state, oldState) {
       if (oldState.balance === state.balance) return
       $el.empty().append(state.balanceCard)
-      loadTokenBalanceDropdown()
+      loadTokenBalance(state.fetchedCoinBalanceBlockNumber)
       updateAllCalculatedUsdValues()
     }
   },
@@ -162,6 +170,9 @@ if ($addressDetailsPage.length) {
     type: 'RECEIVED_UPDATED_BALANCE',
     msg: humps.camelizeKeys(msg)
   }))
+  addressChannel.on('token_balance', (msg) => loadTokenBalance(
+   msg.block_number
+  ))
   addressChannel.on('transaction', (msg) => {
     store.dispatch({
       type: 'RECEIVED_NEW_TRANSACTION',

apps/block_scout_web/lib/block_scout_web/notifier.ex

@@ -29,6 +29,11 @@ defmodule BlockScoutWeb.Notifier do
     Enum.each(address_coin_balances, &broadcast_address_coin_balance/1)
   end
 
+  def handle_event({:chain_event, :address_token_balances, type, address_token_balances})
+      when type in [:realtime, :on_demand] do
+    Enum.each(address_token_balances, &broadcast_address_token_balance/1)
+  end
+
   def handle_event(
         {:chain_event, :contract_verification_result, :on_demand, {address_hash, contract_verification_result, conn}}
       ) do
@@ -203,6 +208,12 @@ defmodule BlockScoutWeb.Notifier do
     })
   end
 
+  defp broadcast_address_token_balance(%{address_hash: address_hash, block_number: block_number}) do
+    Endpoint.broadcast("addresses:#{address_hash}", "token_balance", %{
+      block_number: block_number
+    })
+  end
+
   defp broadcast_balance(%Address{hash: address_hash} = address) do
     Endpoint.broadcast(
       "addresses:#{address_hash}",

apps/block_scout_web/lib/block_scout_web/realtime_event_handler.ex

@@ -23,6 +23,7 @@ defmodule BlockScoutWeb.RealtimeEventHandler do
     Subscriber.to(:transactions, :realtime)
     Subscriber.to(:addresses, :on_demand)
     Subscriber.to(:address_coin_balances, :on_demand)
+    Subscriber.to(:address_token_balances, :on_demand)
     Subscriber.to(:contract_verification_result, :on_demand)
     # Does not come from the indexer
     Subscriber.to(:exchange_rate)

apps/explorer/lib/explorer/chain/events/publisher.ex

@@ -3,7 +3,7 @@ defmodule Explorer.Chain.Events.Publisher do
   Publishes events related to the Chain context.
   """
 
-  @allowed_events ~w(addresses address_coin_balances blocks block_rewards internal_transactions token_transfers transactions contract_verification_result)a
+  @allowed_events ~w(addresses address_coin_balances address_token_balances blocks block_rewards internal_transactions token_transfers transactions contract_verification_result)a
 
   def broadcast(_data, false), do: :ok
 

apps/explorer/lib/explorer/chain/events/subscriber.ex

@@ -3,7 +3,7 @@ defmodule Explorer.Chain.Events.Subscriber do
   Subscribes to events related to the Chain context.
   """
 
-  @allowed_broadcast_events ~w(addresses address_coin_balances blocks block_rewards internal_transactions token_transfers transactions contract_verification_result)a
+  @allowed_broadcast_events ~w(addresses address_coin_balances address_token_balances blocks block_rewards internal_transactions token_transfers transactions contract_verification_result)a
 
   @allowed_broadcast_types ~w(catchup realtime on_demand contract_verification_result)a
 

apps/explorer/lib/explorer/staking/contract_state.ex

@@ -188,7 +188,7 @@ defmodule Explorer.Staking.ContractState do
       validators.all
       |> Enum.map(&ContractReader.staking_by_mining_requests/1)
       |> ContractReader.perform_grouped_requests(validators.all, contracts, abi)
-      |> Map.new(fn {mining_address, resp} -> {mining_address, address_string_to_bytes(resp.staking_address)} end)
+      |> Map.new(fn {mining_address, resp} -> {mining_address, address_string_to_bytes(resp.staking_address).bytes} end)
 
     # the list of all pools (validators + active pools + inactive pools)
     pools = Enum.uniq(
@@ -355,7 +355,7 @@ defmodule Explorer.Staking.ContractState do
 
         block_reward_balance = BalanceReader.get_balances_of([%{
           token_contract_address_hash: token_contract_address_hash,
-          address_hash: block_reward_address,
+          address_hash: block_reward_address.bytes,
           block_number: block_number
         }])[:ok]
 
@@ -367,10 +367,10 @@ defmodule Explorer.Staking.ContractState do
             type: "ERC-20"
           })
 
-        Chain.import(%{
-          addresses: %{params: [%{hash: block_reward_address}], on_conflict: :nothing},
+        import_result = Chain.import(%{
+          addresses: %{params: [%{hash: block_reward_address.bytes}], on_conflict: :nothing},
           address_current_token_balances: %{params: [%{
-            address_hash: block_reward_address,
+            address_hash: block_reward_address.bytes,
             token_contract_address_hash: token_contract_address_hash,
             block_number: block_number,
             value: block_reward_balance,
@@ -378,6 +378,15 @@ defmodule Explorer.Staking.ContractState do
           }]},
           tokens: %{params: [token_params]}
         })
+
+        with {:ok, _} <- import_result, do:
+          Publisher.broadcast([{
+              :address_token_balances, [
+                %{address_hash: block_reward_address.struct, block_number: block_number}
+              ]
+            }],
+            :on_demand
+          )
       end
 
       # start snapshotting at the beginning of the staking epoch
@@ -431,10 +440,10 @@ defmodule Explorer.Staking.ContractState do
       %Chain.Hash{
         byte_count: _,
         bytes: bytes
-      }
+      } = struct
     } = Chain.string_to_address_hash(address_string)
 
-    bytes
+    %{bytes: bytes, struct: struct}
   end
 
   # sobelow_skip ["Traversal"]