Merge pull request #1209 from poanetwork/ets-streaming

ETS streaming

apps/explorer/lib/explorer/chain.ex

@@ -955,7 +955,7 @@ defmodule Explorer.Chain do
   @doc """
   Counts all of the block validations and groups by the `miner_hash`.
   """
-  def group_block_validations_by_address do
+  def each_address_block_validation_count(fun) when is_function(fun, 1) do
     query =
       from(
         b in Block,
@@ -965,7 +965,7 @@ defmodule Explorer.Chain do
         group_by: b.miner_hash
       )
 
-    Repo.all(query)
+    Repo.stream_each(query, fun)
   end
 
   @doc """
@@ -1007,8 +1007,6 @@ defmodule Explorer.Chain do
         ) :: {:ok, accumulator}
         when accumulator: term()
   def stream_unfetched_balances(initial, reducer) when is_function(reducer, 2) do
-    Repo.transaction(
-      fn ->
     query =
       from(
         balance in CoinBalance,
@@ -1016,12 +1014,7 @@ defmodule Explorer.Chain do
         select: %{address_hash: balance.address_hash, block_number: balance.block_number}
       )
 
-        query
-        |> Repo.stream(timeout: :infinity)
-        |> Enum.reduce(initial, reducer)
-      end,
-      timeout: :infinity
-    )
+    Repo.stream_reduce(query, initial, reducer)
   end
 
   @doc """
@@ -1033,16 +1026,8 @@ defmodule Explorer.Chain do
         ) :: {:ok, accumulator}
         when accumulator: term()
   def stream_unfetched_token_balances(initial, reducer) when is_function(reducer, 2) do
-    Repo.transaction(
-      fn ->
-        query = TokenBalance.unfetched_token_balances()
-
-        query
-        |> Repo.stream(timeout: :infinity)
-        |> Enum.reduce(initial, reducer)
-      end,
-      timeout: :infinity
-    )
+    TokenBalance.unfetched_token_balances()
+    |> Repo.stream_reduce(initial, reducer)
   end
 
   @doc """
@@ -1097,8 +1082,6 @@ defmodule Explorer.Chain do
         ) :: {:ok, accumulator}
         when accumulator: term()
   def stream_transactions_with_unfetched_internal_transactions(fields, initial, reducer) when is_function(reducer, 2) do
-    Repo.transaction(
-      fn ->
     query =
       from(
         t in Transaction,
@@ -1107,12 +1090,7 @@ defmodule Explorer.Chain do
         select: ^fields
       )
 
-        query
-        |> Repo.stream(timeout: :infinity)
-        |> Enum.reduce(initial, reducer)
-      end,
-      timeout: :infinity
-    )
+    Repo.stream_reduce(query, initial, reducer)
   end
 
   @doc """
@@ -1129,8 +1107,6 @@ defmodule Explorer.Chain do
         ) :: {:ok, accumulator}
         when accumulator: term()
   def stream_unfetched_uncle_hashes(initial, reducer) when is_function(reducer, 2) do
-    Repo.transaction(
-      fn ->
     query =
       from(bsdr in Block.SecondDegreeRelation,
         where: is_nil(bsdr.uncle_fetched_at),
@@ -1138,12 +1114,7 @@ defmodule Explorer.Chain do
         group_by: bsdr.uncle_hash
       )
 
-        query
-        |> Repo.stream(timeout: :infinity)
-        |> Enum.reduce(initial, reducer)
-      end,
-      timeout: :infinity
-    )
+    Repo.stream_reduce(query, initial, reducer)
   end
 
   @doc """
@@ -1938,9 +1909,7 @@ defmodule Explorer.Chain do
           reducer :: (entry :: Hash.Address.t(), accumulator -> accumulator)
         ) :: {:ok, accumulator}
         when accumulator: term()
-  def stream_uncataloged_token_contract_address_hashes(initial_acc, reducer) when is_function(reducer, 2) do
-    Repo.transaction(
-      fn ->
+  def stream_uncataloged_token_contract_address_hashes(initial, reducer) when is_function(reducer, 2) do
     query =
       from(
         token in Token,
@@ -1948,12 +1917,7 @@ defmodule Explorer.Chain do
         select: token.contract_address_hash
       )
 
-        query
-        |> Repo.stream(timeout: :infinity)
-        |> Enum.reduce(initial_acc, reducer)
-      end,
-      timeout: :infinity
-    )
+    Repo.stream_reduce(query, initial, reducer)
   end
 
   @doc """
@@ -1964,16 +1928,10 @@ defmodule Explorer.Chain do
           reducer :: (entry :: Hash.Address.t(), accumulator -> accumulator)
         ) :: {:ok, accumulator}
         when accumulator: term()
-  def stream_cataloged_token_contract_address_hashes(initial_acc, reducer) when is_function(reducer, 2) do
-    Repo.transaction(
-      fn ->
+  def stream_cataloged_token_contract_address_hashes(initial, reducer) when is_function(reducer, 2) do
     Chain.Token.cataloged_tokens()
     |> order_by(asc: :updated_at)
-        |> Repo.stream(timeout: :infinity)
-        |> Enum.reduce(initial_acc, reducer)
-      end,
-      timeout: :infinity
-    )
+    |> Repo.stream_reduce(initial, reducer)
   end
 
   @doc """
@@ -1992,14 +1950,7 @@ defmodule Explorer.Chain do
         distinct: t.block_number
       )
 
-    Repo.transaction(
-      fn ->
-        query
-        |> Repo.stream(timeout: :infinity)
-        |> Enum.reduce([], &[&1 | &2])
-      end,
-      timeout: :infinity
-    )
+    Repo.stream_reduce(query, [], &[&1 | &2])
   end
 
   @doc """

apps/explorer/lib/explorer/chain/token_transfer.ex

@@ -226,7 +226,7 @@ defmodule Explorer.Chain.TokenTransfer do
   @doc """
   Counts all the token transfers and groups by token contract address hash.
   """
-  def count_token_transfers do
+  def each_count(fun) when is_function(fun, 1) do
     query =
       from(
         tt in TokenTransfer,
@@ -236,6 +236,6 @@ defmodule Explorer.Chain.TokenTransfer do
         group_by: tt.token_contract_address_hash
       )
 
-    Repo.all(query)
+    Repo.stream_each(query, fun)
   end
 end

apps/explorer/lib/explorer/counters/block_validation_counter.ex

@@ -60,11 +60,9 @@ defmodule Explorer.Counters.BlockValidationCounter do
   Consolidates the number of block validations grouped by `address_hash`.
   """
   def consolidate_blocks do
-    total_block_validations = Chain.group_block_validations_by_address()
-
-    for {address_hash, total} <- total_block_validations do
+    Chain.each_address_block_validation_count(fn {address_hash, total} ->
       insert_or_update_counter(address_hash, total)
-    end
+    end)
   end
 
   @doc """

apps/explorer/lib/explorer/counters/token_holders_counter.ex

@@ -6,6 +6,7 @@ defmodule Explorer.Counters.TokenHoldersCounter do
   """
 
   alias Explorer.Chain.Address.TokenBalance
+  alias Explorer.Chain.Hash
   alias Explorer.Repo
 
   @table :token_holders_counter
@@ -59,11 +60,9 @@ defmodule Explorer.Counters.TokenHoldersCounter do
   """
   def consolidate do
     TokenBalance.tokens_grouped_by_number_of_holders()
-    |> Repo.all()
-    |> Enum.map(fn {token, number_of_holders} ->
-      {token.bytes, number_of_holders}
+    |> Repo.stream_each(fn {%Hash{bytes: bytes}, number_of_holders} ->
+      insert_counter({bytes, number_of_holders})
     end)
-    |> insert_counter()
   end
 
   defp schedule_next_consolidation do
@@ -76,8 +75,8 @@ defmodule Explorer.Counters.TokenHoldersCounter do
   @doc """
   Fetches the token holders info for a specific token from the `:ets` table.
   """
-  def fetch(token_hash) do
-    do_fetch(:ets.lookup(table_name(), token_hash.bytes))
+  def fetch(%Hash{bytes: bytes}) do
+    do_fetch(:ets.lookup(table_name(), bytes))
   end
 
   defp do_fetch([{_, result}]), do: result

apps/explorer/lib/explorer/counters/token_transfer_counter.ex

@@ -51,11 +51,9 @@ defmodule Explorer.Counters.TokenTransferCounter do
   Consolidates the number of token transfers grouped by token.
   """
   def consolidate do
-    total_token_transfers = TokenTransfer.count_token_transfers()
-
-    for {token_hash, total} <- total_token_transfers do
+    TokenTransfer.each_count(fn {token_hash, total} ->
       insert_or_update_counter(token_hash, total)
-    end
+    end)
   end
 
   @doc """

apps/explorer/lib/explorer/repo.ex

@@ -20,7 +20,7 @@ defmodule Explorer.Repo do
     returning = opts[:returning]
 
     elements
-    |> Enum.chunk_every(1000)
+    |> Enum.chunk_every(500)
     |> Enum.reduce({0, []}, fn chunk, {total_count, acc} ->
       {count, inserted} =
         try do
@@ -65,4 +65,23 @@ defmodule Explorer.Repo do
       end
     end)
   end
+
+  def stream_in_transaction(query, fun) when is_function(fun, 1) do
+    transaction(
+      fn ->
+        query
+        |> stream(timeout: :infinity)
+        |> fun.()
+      end,
+      timeout: :infinity
+    )
+  end
+
+  def stream_each(query, fun) when is_function(fun, 1) do
+    stream_in_transaction(query, &Enum.each(&1, fun))
+  end
+
+  def stream_reduce(query, initial, reducer) when is_function(reducer, 2) do
+    stream_in_transaction(query, &Enum.reduce(&1, initial, reducer))
+  end
 end

apps/explorer/test/explorer/chain/token_transfer_test.exs

@@ -146,8 +146,8 @@ defmodule Explorer.Chain.TokenTransferTest do
     end
   end
 
-  describe "count_token_transfers/0" do
-    test "returns token transfers grouped by tokens" do
+  describe "each_count/0" do
+    test "streams token transfers grouped by tokens" do
       token_contract_address = insert(:contract_address)
       token = insert(:token, contract_address: token_contract_address)
 
@@ -172,7 +172,11 @@ defmodule Explorer.Chain.TokenTransferTest do
         token: token
       )
 
-      results = TokenTransfer.count_token_transfers()
+      {:ok, agent_pid} = Agent.start_link(fn -> [] end)
+
+      TokenTransfer.each_count(fn entry -> Agent.update(agent_pid, &[entry | &1]) end)
+
+      results = Agent.get(agent_pid, fn entries -> Enum.reverse(entries) end)
 
       assert length(results) == 1
       assert List.first(results) == {token.contract_address_hash, 2}

apps/explorer/test/explorer/chain_test.exs

@@ -1240,13 +1240,17 @@ defmodule Explorer.ChainTest do
     end
   end
 
-  describe "group_block_validations_by_address/0" do
-    test "returns block validations grouped by the address that validated them (`address_hash`)" do
+  describe "each_address_block_validation_count/0" do
+    test "streams block validation count grouped by the address that validated them (`address_hash`)" do
       address = insert(:address)
 
       insert(:block, miner: address, miner_hash: address.hash)
 
-      results = Chain.group_block_validations_by_address()
+      {:ok, agent_pid} = Agent.start_link(fn -> [] end)
+
+      Chain.each_address_block_validation_count(fn entry -> Agent.update(agent_pid, &[entry | &1]) end)
+
+      results = Agent.get(agent_pid, &Enum.reverse/1)
 
       assert length(results) == 1
       assert results == [{address.hash, 1}]