Improve locks acquiring (#7947)

* Decrease locks level

* Move tokens lock acquiring

* Update EmptyBlocksSanitizer locks

CHANGELOG.md

@@ -16,6 +16,7 @@
 - [#7859](https://github.com/blockscout/blockscout/pull/7859) - Add TokenTotalSupplyUpdater
 - [#7873](https://github.com/blockscout/blockscout/pull/7873) - Chunk realtime balances requests
 - [#7927](https://github.com/blockscout/blockscout/pull/7927) - Delete token balances only for blocks that lost consensus
+- [#7947](https://github.com/blockscout/blockscout/pull/7947) - Improve locks acquiring
 
 ### Fixes
 

apps/explorer/lib/explorer/chain.ex

@@ -4221,7 +4221,7 @@ defmodule Explorer.Chain do
         where: address_name.address_hash == ^address_hash,
         # Enforce Name ShareLocks order (see docs: sharelocks.md)
         order_by: [asc: :address_hash, asc: :name],
-        lock: "FOR UPDATE"
+        lock: "FOR NO KEY UPDATE"
       )
 
     repo.update_all(
@@ -5159,7 +5159,7 @@ defmodule Explorer.Chain do
       )
       # Enforce Transaction ShareLocks order (see docs: sharelocks.md)
       |> order_by(asc: :hash)
-      |> lock("FOR UPDATE")
+      |> lock("FOR NO KEY UPDATE")
 
     hashes = Enum.map(transactions, & &1.hash)
 
@@ -5204,7 +5204,7 @@ defmodule Explorer.Chain do
         end)
         # Enforce Transaction ShareLocks order (see docs: sharelocks.md)
         |> order_by(asc: :hash)
-        |> lock("FOR UPDATE")
+        |> lock("FOR NO KEY UPDATE")
 
       Repo.update_all(
         from(t in Transaction, join: s in subquery(query), on: t.hash == s.hash),

apps/explorer/lib/explorer/chain/import/runner/address/current_token_balances.ex

@@ -107,35 +107,13 @@ defmodule Explorer.Chain.Import.Runner.Address.CurrentTokenBalances do
       |> Map.put_new(:timeout, @timeout)
       |> Map.put(:timestamps, timestamps)
 
-    # Enforce ShareLocks tables order (see docs: sharelocks.md)
-    run_func = fn repo ->
-      token_contract_address_hashes_and_ids =
-        changes_list
-        |> Enum.map(fn change ->
-          token_id = get_token_id(change)
-
-          {change.token_contract_address_hash, token_id}
-        end)
-        |> Enum.uniq()
-
-      Tokens.acquire_contract_address_tokens(repo, token_contract_address_hashes_and_ids)
-    end
-
     multi
-    |> Multi.run(:acquire_contract_address_tokens, fn repo, _ ->
-      Instrumenter.block_import_stage_runner(
-        fn -> run_func.(repo) end,
-        :block_following,
-        :current_token_balances,
-        :acquire_contract_address_tokens
-      )
-    end)
     |> Multi.run(:address_current_token_balances, fn repo, _ ->
       Instrumenter.block_import_stage_runner(
         fn -> insert(repo, changes_list, insert_options) end,
         :block_following,
         :current_token_balances,
-        :acquire_contract_address_tokens
+        :address_current_token_balances
       )
     end)
     |> Multi.run(:address_current_token_balances_update_token_holder_counts, fn repo,
@@ -156,15 +134,11 @@ defmodule Explorer.Chain.Import.Runner.Address.CurrentTokenBalances do
         end,
         :block_following,
         :current_token_balances,
-        :acquire_contract_address_tokens
+        :address_current_token_balances_update_token_holder_counts
       )
     end)
   end
 
-  defp get_token_id(change) do
-    if Map.has_key?(change, :token_id), do: change.token_id, else: nil
-  end
-
   @impl Import.Runner
   def timeout, do: @timeout
 

apps/explorer/lib/explorer/chain/import/runner/addresses.ex

@@ -243,7 +243,7 @@ defmodule Explorer.Chain.Import.Runner.Addresses do
           where: t.created_contract_address_hash in ^ordered_created_contract_hashes,
           # Enforce Transaction ShareLocks order (see docs: sharelocks.md)
           order_by: t.hash,
-          lock: "FOR UPDATE"
+          lock: "FOR NO KEY UPDATE"
         )
 
       try do

apps/explorer/lib/explorer/chain/import/runner/blocks.ex

@@ -149,14 +149,6 @@ defmodule Explorer.Chain.Import.Runner.Blocks do
         :derive_transaction_forks
       )
     end)
-    |> Multi.run(:acquire_contract_address_tokens, fn repo, %{lose_consensus: non_consensus_blocks} ->
-      Instrumenter.block_import_stage_runner(
-        fn -> acquire_contract_address_tokens(repo, non_consensus_blocks) end,
-        :address_referencing,
-        :blocks,
-        :acquire_contract_address_tokens
-      )
-    end)
     |> Multi.run(:delete_address_token_balances, fn repo, %{lose_consensus: non_consensus_blocks} ->
       Instrumenter.block_import_stage_runner(
         fn -> delete_address_token_balances(repo, non_consensus_blocks, insert_options) end,
@@ -205,21 +197,6 @@ defmodule Explorer.Chain.Import.Runner.Blocks do
   @impl Runner
   def timeout, do: @timeout
 
-  defp acquire_contract_address_tokens(repo, non_consensus_blocks) do
-    non_consensus_block_numbers = Enum.map(non_consensus_blocks, fn {number, _hash} -> number end)
-
-    query =
-      from(ctb in Address.CurrentTokenBalance,
-        where: ctb.block_number in ^non_consensus_block_numbers,
-        select: {ctb.token_contract_address_hash, ctb.token_id},
-        distinct: [ctb.token_contract_address_hash, ctb.token_id]
-      )
-
-    contract_address_hashes_and_token_ids = repo.all(query)
-
-    Tokens.acquire_contract_address_tokens(repo, contract_address_hashes_and_token_ids)
-  end
-
   defp fork_transactions(%{
          repo: repo,
          timeout: timeout,
@@ -232,7 +209,7 @@ defmodule Explorer.Chain.Import.Runner.Blocks do
         select: transaction,
         # Enforce Transaction ShareLocks order (see docs: sharelocks.md)
         order_by: [asc: :hash],
-        lock: "FOR UPDATE"
+        lock: "FOR NO KEY UPDATE"
       )
 
     update_query =
@@ -378,7 +355,7 @@ defmodule Explorer.Chain.Import.Runner.Blocks do
         select: block.hash,
         # Enforce Block ShareLocks order (see docs: sharelocks.md)
         order_by: [asc: block.hash],
-        lock: "FOR UPDATE"
+        lock: "FOR NO KEY UPDATE"
       )
 
     {_, removed_consensus_block_hashes} =
@@ -683,7 +660,7 @@ defmodule Explorer.Chain.Import.Runner.Blocks do
         where: bsdr.uncle_hash in ^uncle_hashes,
         # Enforce SeconDegreeRelation ShareLocks order (see docs: sharelocks.md)
         order_by: [asc: :nephew_hash, asc: :uncle_hash],
-        lock: "FOR UPDATE"
+        lock: "FOR NO KEY UPDATE"
       )
 
     update_query =

apps/explorer/lib/explorer/chain/import/runner/internal_transactions.ex

@@ -286,7 +286,7 @@ defmodule Explorer.Chain.Import.Runner.InternalTransactions do
         select: block.hash,
         # Enforce Block ShareLocks order (see docs: sharelocks.md)
         order_by: [asc: block.hash],
-        lock: "FOR UPDATE"
+        lock: "FOR NO KEY UPDATE"
       )
 
     {:ok, repo.all(query)}
@@ -314,7 +314,7 @@ defmodule Explorer.Chain.Import.Runner.InternalTransactions do
         select: map(t, [:hash, :block_hash, :block_number, :cumulative_gas_used]),
         # Enforce Transaction ShareLocks order (see docs: sharelocks.md)
         order_by: [asc: t.hash],
-        lock: "FOR UPDATE"
+        lock: "FOR NO KEY UPDATE"
       )
 
     {:ok, repo.all(query)}

apps/explorer/lib/explorer/chain/import/runner/tokens.ex

@@ -22,79 +22,10 @@ defmodule Explorer.Chain.Import.Runner.Tokens do
   @type holder_count :: non_neg_integer()
   @type token_holder_count :: %{contract_address_hash: Hash.Address.t(), count: holder_count()}
 
-  def acquire_contract_address_tokens(repo, contract_address_hashes_and_token_ids) do
-    initial_query_no_token_id =
-      from(token in Token,
-        select: token
-      )
-
-    initial_query_with_token_id =
-      from(token in Token,
-        left_join: instance in Token.Instance,
-        on: token.contract_address_hash == instance.token_contract_address_hash,
-        select: token
-      )
-
-    {query_no_token_id, query_with_token_id} =
-      contract_address_hashes_and_token_ids
-      |> Enum.reduce({initial_query_no_token_id, initial_query_with_token_id}, fn {contract_address_hash, token_id},
-                                                                                  {query_no_token_id,
-                                                                                   query_with_token_id} ->
-        if is_nil(token_id) do
-          {from(
-             token in query_no_token_id,
-             or_where: token.contract_address_hash == ^contract_address_hash
-           ), query_with_token_id}
-        else
-          {query_no_token_id,
-           from(
-             [token, instance] in query_with_token_id,
-             or_where: token.contract_address_hash == ^contract_address_hash and instance.token_id == ^token_id
-           )}
-        end
-      end)
-
-    final_query_no_token_id =
-      if query_no_token_id == initial_query_no_token_id do
-        nil
-      else
-        from(
-          token in query_no_token_id,
-          # Enforce Token ShareLocks order (see docs: sharelocks.md)
-          order_by: [
-            token.contract_address_hash
-          ],
-          lock: "FOR NO KEY UPDATE"
-        )
-      end
-
-    final_query_with_token_id =
-      if query_with_token_id == initial_query_with_token_id do
-        nil
-      else
-        from(
-          [token, instance] in query_with_token_id,
-          # Enforce Token ShareLocks order (see docs: sharelocks.md)
-          order_by: [
-            token.contract_address_hash,
-            instance.token_id
-          ],
-          lock: "FOR NO KEY UPDATE OF t0"
-        )
-      end
-
-    tokens_no_token_id = (final_query_no_token_id && repo.all(final_query_no_token_id)) || []
-    tokens_with_token_id = (final_query_with_token_id && repo.all(final_query_with_token_id)) || []
-    tokens = tokens_no_token_id ++ tokens_with_token_id
-
-    {:ok, tokens}
-  end
-
   def update_holder_counts_with_deltas(repo, token_holder_count_deltas, %{
         timeout: timeout,
         timestamps: %{updated_at: updated_at}
       }) do
-    # NOTE that acquire_contract_address_tokens needs to be called before this
     {hashes, deltas} =
       token_holder_count_deltas
       |> Enum.map(fn %{contract_address_hash: contract_address_hash, delta: delta} ->
@@ -103,6 +34,15 @@ defmodule Explorer.Chain.Import.Runner.Tokens do
       end)
       |> Enum.unzip()
 
+    token_query =
+      from(
+        token in Token,
+        where: token.contract_address_hash in ^hashes,
+        select: token.contract_address_hash,
+        order_by: token.contract_address_hash,
+        lock: "FOR NO KEY UPDATE"
+      )
+
     query =
       from(
         token in Token,
@@ -113,8 +53,8 @@ defmodule Explorer.Chain.Import.Runner.Tokens do
             ^deltas
           ),
         on: token.contract_address_hash == deltas.contract_address_hash,
+        where: token.contract_address_hash in subquery(token_query),
         where: not is_nil(token.holder_count),
-        # ShareLocks order already enforced by `acquire_contract_address_tokens` (see docs: sharelocks.md)
         update: [
           set: [
             holder_count: token.holder_count + deltas.delta,

apps/explorer/lib/explorer/chain/import/runner/transactions.ex

@@ -215,7 +215,7 @@ defmodule Explorer.Chain.Import.Runner.Transactions do
           where: block.hash in ^block_hashes,
           # Enforce Block ShareLocks order (see docs: sharelocks.md)
           order_by: [asc: block.hash],
-          lock: "FOR UPDATE"
+          lock: "FOR NO KEY UPDATE"
         )
 
       try do

apps/indexer/lib/indexer/fetcher/empty_blocks_sanitizer.ex

@@ -68,19 +68,15 @@ defmodule Indexer.Fetcher.EmptyBlocksSanitizer do
   end
 
   defp sanitize_empty_blocks(json_rpc_named_arguments) do
-    unprocessed_non_empty_blocks_from_db = unprocessed_non_empty_blocks_query_list(limit())
+    unprocessed_non_empty_blocks_query = unprocessed_non_empty_blocks_query(limit())
 
-    uniq_block_hashes = unprocessed_non_empty_blocks_from_db
-
-    if Enum.count(uniq_block_hashes) > 0 do
     Repo.update_all(
       from(
         block in Block,
-          where: block.hash in ^uniq_block_hashes
+        where: block.hash in subquery(unprocessed_non_empty_blocks_query)
       ),
       set: [is_empty: false, updated_at: Timex.now()]
     )
-    end
 
     unprocessed_empty_blocks_from_db = unprocessed_empty_blocks_query_list(limit())
 
@@ -141,25 +137,20 @@ defmodule Indexer.Fetcher.EmptyBlocksSanitizer do
       where: block.consensus == true,
       order_by: [asc: block.hash],
       limit: ^limit,
-      offset: 1000,
+      offset: 1000
-      lock: "FOR UPDATE"
     )
   end
 
-  defp unprocessed_non_empty_blocks_query_list(limit) do
+  defp unprocessed_non_empty_blocks_query(limit) do
     blocks_query = consensus_blocks_with_nil_is_empty_query(limit)
 
-    query =
     from(q in subquery(blocks_query),
       inner_join: transaction in Transaction,
       on: q.number == transaction.block_number,
       select: q.hash,
-        distinct: q.hash,
+      order_by: [asc: q.hash],
-        order_by: [asc: q.hash]
+      lock: fragment("FOR NO KEY UPDATE OF ?", q)
     )
-
-    query
-    |> Repo.all(timeout: :infinity)
   end
 
   defp unprocessed_empty_blocks_query_list(limit) do

apps/indexer/lib/indexer/temporary/blocks_transactions_mismatch.ex

@@ -136,7 +136,7 @@ defmodule Indexer.Temporary.BlocksTransactionsMismatch do
         where: block.hash in ^hashes,
         # Enforce Block ShareLocks order (see docs: sharelocks.md)
         order_by: [asc: block.hash],
-        lock: "FOR UPDATE"
+        lock: "FOR NO KEY UPDATE"
       )
 
     Repo.update_all(