Merge branch 'master' into ab-fallback-to-two-evm-versions

CHANGELOG.md

@@ -2,10 +2,21 @@
 
 ### Features
 
- - [1611](https://github.com/poanetwork/blockscout/pull/1611) - allow setting the first indexing block
- - [1596](https://github.com/poanetwork/blockscout/pull/1596) - add endpoint to create decompiled contracts
  - [1661](https://github.com/poanetwork/blockscout/pull/1661) - try to compile smart contract with the latest evm version
 
+### Fixes
+
+### Chore
+
+
+## 1.3.8-beta
+
+### Features
+
+ - [#1611](https://github.com/poanetwork/blockscout/pull/1611) - allow setting the first indexing block
+ - [#1596](https://github.com/poanetwork/blockscout/pull/1596) - add endpoint to create decompiled contracts
+ - [#1634](https://github.com/poanetwork/blockscout/pull/1634) - add transaction count cache
+
 ### Fixes
 
  - [#1630](https://github.com/poanetwork/blockscout/pull/1630) - (Fix) colour for release link in the footer
@@ -15,6 +26,7 @@
  - [#1643](https://github.com/poanetwork/blockscout/pull/1643) - Set internal_transactions_indexed_at for empty blocks
  - [#1647](https://github.com/poanetwork/blockscout/pull/1647) - Fix typo in view
  - [#1650](https://github.com/poanetwork/blockscout/pull/1650) - Add petersburg evm version to smart contract verifier
+ - [#1657](https://github.com/poanetwork/blockscout/pull/1657) - Force consensus loss for parent block if its hash mismatches parent_hash
 
 ### Chore
 
@@ -41,6 +53,7 @@
  - [#1589](https://github.com/poanetwork/blockscout/pull/1589) - RPC endpoint to list addresses
  - [#1567](https://github.com/poanetwork/blockscout/pull/1567) - Allow setting different configuration just for realtime fetcher
  - [#1562](https://github.com/poanetwork/blockscout/pull/1562) - Add incoming transactions count to contract view
+ - [#1608](https://github.com/poanetwork/blockscout/pull/1608) - Add listcontracts RPC Endpoint
 
 ### Fixes
 

apps/block_scout_web/lib/block_scout_web/controllers/api/rpc/address_controller.ex

@@ -1,6 +1,7 @@
 defmodule BlockScoutWeb.API.RPC.AddressController do
   use BlockScoutWeb, :controller
 
+  alias BlockScoutWeb.API.RPC.Helpers
   alias Explorer.{Chain, Etherscan}
   alias Explorer.Chain.{Address, Wei}
 
@@ -162,7 +163,7 @@ defmodule BlockScoutWeb.API.RPC.AddressController do
   end
 
   def getminedblocks(conn, params) do
-    options = put_pagination_options(%{}, params)
+    options = Helpers.put_pagination_options(%{}, params)
 
     with {:address_param, {:ok, address_param}} <- fetch_address(params),
          {:format, {:ok, address_hash}} <- to_address_hash(address_param),
@@ -188,7 +189,7 @@ defmodule BlockScoutWeb.API.RPC.AddressController do
   def optional_params(params) do
     %{}
     |> put_order_by_direction(params)
-    |> put_pagination_options(params)
+    |> Helpers.put_pagination_options(params)
     |> put_start_block(params)
     |> put_end_block(params)
     |> put_filter_by(params)
@@ -338,24 +339,6 @@ defmodule BlockScoutWeb.API.RPC.AddressController do
     end
   end
 
-  defp put_pagination_options(options, params) do
-    with %{"page" => page, "offset" => offset} <- params,
-         {page_number, ""} when page_number > 0 <- Integer.parse(page),
-         {page_size, ""} when page_size > 0 <- Integer.parse(offset),
-         :ok <- validate_max_page_size(page_size) do
-      options
-      |> Map.put(:page_number, page_number)
-      |> Map.put(:page_size, page_size)
-    else
-      _ ->
-        options
-    end
-  end
-
-  defp validate_max_page_size(page_size) do
-    if page_size <= Etherscan.page_size_max(), do: :ok, else: :error
-  end
-
   defp put_start_block(options, params) do
     with %{"startblock" => startblock_param} <- params,
          {start_block, ""} <- Integer.parse(startblock_param) do

apps/block_scout_web/lib/block_scout_web/controllers/api/rpc/contract_controller.ex

@@ -1,7 +1,30 @@
 defmodule BlockScoutWeb.API.RPC.ContractController do
   use BlockScoutWeb, :controller
 
+  alias BlockScoutWeb.API.RPC.Helpers
   alias Explorer.Chain
+  alias Explorer.Chain.SmartContract
+
+  def listcontracts(conn, params) do
+    with pagination_options <- Helpers.put_pagination_options(%{}, params),
+         {:params, {:ok, options}} <- {:params, add_filter(pagination_options, params)} do
+      options_with_defaults =
+        options
+        |> Map.put_new(:page_number, 0)
+        |> Map.put_new(:page_size, 10)
+
+      contracts = list_contracts(options_with_defaults)
+
+      conn
+      |> put_status(200)
+      |> render(:listcontracts, %{contracts: contracts})
+    else
+      {:params, {:error, error}} ->
+        conn
+        |> put_status(400)
+        |> render(:error, error: error)
+    end
+  end
 
   def getabi(conn, params) do
     with {:address_param, {:ok, address_param}} <- fetch_address(params),
@@ -24,7 +47,10 @@ defmodule BlockScoutWeb.API.RPC.ContractController do
     with {:address_param, {:ok, address_param}} <- fetch_address(params),
          {:format, {:ok, address_hash}} <- to_address_hash(address_param),
          {:contract, {:ok, contract}} <- to_smart_contract(address_hash) do
-      render(conn, :getsourcecode, %{contract: contract})
+      render(conn, :getsourcecode, %{
+        contract: contract,
+        address_hash: address_hash
+      })
     else
       {:address_param, :error} ->
         render(conn, :error, error: "Query parameter address is required")
@@ -33,10 +59,64 @@ defmodule BlockScoutWeb.API.RPC.ContractController do
         render(conn, :error, error: "Invalid address hash")
 
       {:contract, :not_found} ->
-        render(conn, :getsourcecode, %{contract: nil})
+        render(conn, :getsourcecode, %{contract: nil, address_hash: nil})
+    end
+  end
+
+  defp list_contracts(%{page_number: page_number, page_size: page_size} = opts) do
+    offset = (max(page_number, 1) - 1) * page_size
+
+    case Map.get(opts, :filter) do
+      :verified ->
+        Chain.list_verified_contracts(page_size, offset)
+
+      :decompiled ->
+        Chain.list_decompiled_contracts(page_size, offset)
+
+      :unverified ->
+        Chain.list_unverified_contracts(page_size, offset)
+
+      :not_decompiled ->
+        Chain.list_not_decompiled_contracts(page_size, offset)
+
+      _ ->
+        Chain.list_contracts(page_size, offset)
     end
   end
 
+  defp add_filter(options, params) do
+    with {:param, {:ok, value}} <- {:param, Map.fetch(params, "filter")},
+         {:validation, {:ok, filter}} <- {:validation, contracts_filter(value)} do
+      {:ok, Map.put(options, :filter, filter)}
+    else
+      {:param, :error} -> {:ok, options}
+      {:validation, {:error, error}} -> {:error, error}
+    end
+  end
+
+  defp contracts_filter(nil), do: {:ok, nil}
+  defp contracts_filter(1), do: {:ok, :verified}
+  defp contracts_filter(2), do: {:ok, :decompiled}
+  defp contracts_filter(3), do: {:ok, :unverified}
+  defp contracts_filter(4), do: {:ok, :not_decompiled}
+  defp contracts_filter("verified"), do: {:ok, :verified}
+  defp contracts_filter("decompiled"), do: {:ok, :decompiled}
+  defp contracts_filter("unverified"), do: {:ok, :unverified}
+  defp contracts_filter("not_decompiled"), do: {:ok, :not_decompiled}
+
+  defp contracts_filter(filter) when is_bitstring(filter) do
+    case Integer.parse(filter) do
+      {number, ""} -> contracts_filter(number)
+      _ -> {:error, contracts_filter_error_message(filter)}
+    end
+  end
+
+  defp contracts_filter(filter), do: {:error, contracts_filter_error_message(filter)}
+
+  defp contracts_filter_error_message(filter) do
+    "#{filter} is not a valid value for `filter`. Please use one of: verified, decompiled, unverified, not_decompiled, 1, 2, 3, 4."
+  end
+
   defp fetch_address(params) do
     {:address_param, Map.fetch(params, "address")}
   end
@@ -48,8 +128,11 @@ defmodule BlockScoutWeb.API.RPC.ContractController do
   defp to_smart_contract(address_hash) do
     result =
       case Chain.address_hash_to_smart_contract(address_hash) do
-        nil -> :not_found
-        contract -> {:ok, contract}
+        nil ->
+          :not_found
+
+        contract ->
+          {:ok, SmartContract.preload_decompiled_smart_contract(contract)}
       end
 
     {:contract, result}

apps/block_scout_web/lib/block_scout_web/controllers/api/rpc/helpers.ex

@@ -0,0 +1,42 @@
+defmodule BlockScoutWeb.API.RPC.Helpers do
+  @moduledoc """
+  Small helpers for RPC api controllers.
+  """
+  alias Explorer.Etherscan
+
+  def put_pagination_options(options, params) do
+    options
+    |> put_page_option(params)
+    |> put_offset_option(params)
+  end
+
+  def put_page_option(options, %{"page" => page}) do
+    case Integer.parse(page) do
+      {page_number, ""} when page_number > 0 ->
+        Map.put(options, :page_number, page_number)
+
+      _ ->
+        options
+    end
+  end
+
+  def put_page_option(options, _), do: options
+
+  def put_offset_option(options, %{"offset" => offset}) do
+    with {page_size, ""} when page_size > 0 <- Integer.parse(offset),
+         :ok <- validate_max_page_size(page_size) do
+      Map.put(options, :page_size, page_size)
+    else
+      _ ->
+        options
+    end
+  end
+
+  def put_offset_option(options, _) do
+    options
+  end
+
+  defp validate_max_page_size(page_size) do
+    if page_size <= Etherscan.page_size_max(), do: :ok, else: :error
+  end
+end

apps/block_scout_web/lib/block_scout_web/etherscan.ex

@@ -276,6 +276,45 @@ defmodule BlockScoutWeb.Etherscan do
     "result" => nil
   }
 
+  @contract_listcontracts_example_value %{
+    "status" => "1",
+    "message" => "OK",
+    "result" => [
+      %{
+        "SourceCode" => """
+        pragma solidity >0.4.24;
+
+        contract Test {
+        constructor() public { b = hex"12345678901234567890123456789012"; }
+        event Event(uint indexed a, bytes32 b);
+        event Event2(uint indexed a, bytes32 b);
+        function foo(uint a) public { emit Event(a, b); }
+        bytes32 b;
+        }
+        """,
+        "ABI" => """
+        [{
+        "type":"event",
+        "inputs": [{"name":"a","type":"uint256","indexed":true},{"name":"b","type":"bytes32","indexed":false}],
+        "name":"Event"
+        }, {
+        "type":"event",
+        "inputs": [{"name":"a","type":"uint256","indexed":true},{"name":"b","type":"bytes32","indexed":false}],
+        "name":"Event2"
+        }, {
+        "type":"function",
+        "inputs": [{"name":"a","type":"uint256"}],
+        "name":"foo",
+        "outputs": []
+        }]
+        """,
+        "ContractName" => "Test",
+        "CompilerVersion" => "v0.2.1-2016-01-30-91a6b35",
+        "OptimizationUsed" => "1"
+      }
+    ]
+  }
+
   @contract_getabi_example_value %{
     "status" => "1",
     "message" => "OK",
@@ -742,6 +781,7 @@ defmodule BlockScoutWeb.Etherscan do
   @contract_model %{
     name: "Contract",
     fields: %{
+      "Address" => @address_hash_type,
       "SourceCode" => %{
         type: "contract source code",
         definition: "The contract's source code.",
@@ -757,6 +797,33 @@ defmodule BlockScoutWeb.Etherscan do
         }"
         """
       },
+      "DecompilerVersion" => %{
+        type: "decompiler version",
+        definition: "When decompiled source code is present, the decompiler version with which it was generated.",
+        example: "decompiler.version"
+      },
+      "DecompiledSourceCode" => %{
+        type: "contract decompiled source code",
+        definition: "The contract's decompiled source code.",
+        example: """
+        const name() = 'CryptoKitties'
+        const GEN0_STARTING_PRICE() = 10^16
+        const GEN0_AUCTION_DURATION() = 86400
+        const GEN0_CREATION_LIMIT() = 45000
+        const symbol() = 'CK'
+        const PROMO_CREATION_LIMIT() = 5000
+        def storage:
+          ceoAddress is addr # mask(160, 0) at storage #0
+          cfoAddress is addr # mask(160, 0) at storage #1
+          stor1.768 is uint16 => uint256 # mask(256, 768) at storage #1
+          cooAddress is addr # mask(160, 0) at storage #2
+          stor2.0 is uint256 => uint256 # mask(256, 0) at storage #2
+          paused is uint8 # mask(8, 160) at storage #2
+          stor2.256 is uint256 => uint256 # mask(256, 256) at storage #2
+          stor3 is uint32 #
+        ...<continues>
+        """
+      },
       "ABI" => %{
         type: "ABI",
         definition: "JSON string for the contract's Application Binary Interface (ABI)",
@@ -1343,11 +1410,6 @@ defmodule BlockScoutWeb.Etherscan do
             }
           }
         }
-      },
-      %{
-        code: "200",
-        description: "error",
-        example_value: Jason.encode!(@account_getminedblocks_example_value_error)
       }
     ]
   }
@@ -1635,6 +1697,50 @@ defmodule BlockScoutWeb.Etherscan do
     ]
   }
 
+  @contract_listcontracts_action %{
+    name: "listcontracts",
+    description: "Get a list of contracts, sorted ascending by the time they were first seen by the explorer.",
+    required_params: [],
+    optional_params: [
+      %{
+        key: "page",
+        type: "integer",
+        description:
+          "A nonnegative integer that represents the page number to be used for pagination. 'offset' must be provided in conjunction."
+      },
+      %{
+        key: "offset",
+        type: "integer",
+        description:
+          "A nonnegative integer that represents the maximum number of records to return when paginating. 'page' must be provided in conjunction."
+      },
+      %{
+        key: "filter",
+        type: "string",
+        description:
+          "verified|decompiled|unverified|not_decompiled, or 1|2|3|4 respectively. This requests only contracts with that status."
+      }
+    ],
+    responses: [
+      %{
+        code: "200",
+        description: "successful operation",
+        example_value: Jason.encode!(@contract_listcontracts_example_value),
+        model: %{
+          name: "Result",
+          fields: %{
+            status: @status_type,
+            message: @message_type,
+            result: %{
+              type: "array",
+              array_type: @contract_model
+            }
+          }
+        }
+      }
+    ]
+  }
+
   @contract_getabi_action %{
     name: "getabi",
     description: "Get ABI for verified contract. Also available through a GraphQL 'addresses' query.",
@@ -1862,6 +1968,7 @@ defmodule BlockScoutWeb.Etherscan do
   @contract_module %{
     name: "contract",
     actions: [
+      @contract_listcontracts_action,
       @contract_getabi_action,
       @contract_getsourcecode_action
     ]

apps/block_scout_web/lib/block_scout_web/views/api/rpc/contract_view.ex

@@ -2,40 +2,88 @@ defmodule BlockScoutWeb.API.RPC.ContractView do
   use BlockScoutWeb, :view
 
   alias BlockScoutWeb.API.RPC.RPCView
+  alias Explorer.Chain.{Address, DecompiledSmartContract, SmartContract}
+
+  def render("listcontracts.json", %{contracts: contracts}) do
+    contracts = Enum.map(contracts, &prepare_contract/1)
+
+    RPCView.render("show.json", data: contracts)
+  end
 
   def render("getabi.json", %{abi: abi}) do
     RPCView.render("show.json", data: Jason.encode!(abi))
   end
 
-  def render("getsourcecode.json", %{contract: contract}) do
-    RPCView.render("show.json", data: prepare_contract(contract))
+  def render("getsourcecode.json", %{contract: contract, address_hash: address_hash}) do
+    RPCView.render("show.json", data: [prepare_source_code_contract(contract, address_hash)])
   end
 
   def render("error.json", assigns) do
     RPCView.render("error.json", assigns)
   end
 
-  defp prepare_contract(nil) do
-    [
+  defp prepare_source_code_contract(nil, address_hash) do
     %{
+      "Address" => to_string(address_hash),
       "SourceCode" => "",
       "ABI" => "Contract source code not verified",
       "ContractName" => "",
       "CompilerVersion" => "",
+      "DecompiledSourceCode" => "",
+      "DecompilerVersion" => "",
       "OptimizationUsed" => ""
     }
-    ]
   end
 
-  defp prepare_contract(contract) do
-    [
+  defp prepare_source_code_contract(contract, _) do
     %{
+      "Address" => to_string(contract.address_hash),
       "SourceCode" => contract.contract_source_code,
       "ABI" => Jason.encode!(contract.abi),
       "ContractName" => contract.name,
+      "DecompiledSourceCode" => decompiled_source_code(contract.decompiled_smart_contract),
+      "DecompilerVersion" => decompiler_version(contract.decompiled_smart_contract),
       "CompilerVersion" => contract.compiler_version,
       "OptimizationUsed" => if(contract.optimization, do: "1", else: "0")
     }
-    ]
   end
+
+  defp prepare_contract(%Address{hash: hash, smart_contract: nil, decompiled_smart_contract: decompiled_smart_contract}) do
+    %{
+      "Address" => to_string(hash),
+      "SourceCode" => "",
+      "ABI" => "Contract source code not verified",
+      "ContractName" => "",
+      "DecompiledSourceCode" => decompiled_source_code(decompiled_smart_contract),
+      "DecompilerVersion" => decompiler_version(decompiled_smart_contract),
+      "CompilerVersion" => "",
+      "OptimizationUsed" => ""
+    }
+  end
+
+  defp prepare_contract(%Address{
+         hash: hash,
+         smart_contract: %SmartContract{} = contract,
+         decompiled_smart_contract: decompiled_smart_contract
+       }) do
+    %{
+      "Address" => to_string(hash),
+      "SourceCode" => contract.contract_source_code,
+      "ABI" => Jason.encode!(contract.abi),
+      "ContractName" => contract.name,
+      "DecompiledSourceCode" => decompiled_source_code(decompiled_smart_contract),
+      "DecompilerVersion" => decompiler_version(decompiled_smart_contract),
+      "CompilerVersion" => contract.compiler_version,
+      "OptimizationUsed" => if(contract.optimization, do: "1", else: "0")
+    }
+  end
+
+  defp decompiled_source_code(nil), do: "Contract source code not decompiled."
+
+  defp decompiled_source_code(%DecompiledSmartContract{decompiled_source_code: decompiled_source_code}) do
+    decompiled_source_code
+  end
+
+  defp decompiler_version(nil), do: ""
+  defp decompiler_version(%DecompiledSmartContract{decompiler_version: decompiler_version}), do: decompiler_version
 end

apps/block_scout_web/test/block_scout_web/controllers/api/rpc/address_controller_test.exs

@@ -767,34 +767,7 @@ defmodule BlockScoutWeb.API.RPC.AddressControllerTest do
       assert response["message"] == "OK"
     end
 
-    test "ignores pagination params if page is less than 1", %{conn: conn} do
-      address = insert(:address)
-
-      6
-      |> insert_list(:transaction, from_address: address)
-      |> with_block()
-
-      params = %{
-        "module" => "account",
-        "action" => "txlist",
-        "address" => "#{address.hash}",
-        # page number
-        "page" => "0",
-        # page size
-        "offset" => "2"
-      }
-
-      assert response =
-               conn
-               |> get("/api", params)
-               |> json_response(200)
-
-      assert length(response["result"]) == 6
-      assert response["status"] == "1"
-      assert response["message"] == "OK"
-    end
-
-    test "ignores pagination params if offset is less than 1", %{conn: conn} do
+    test "ignores offset param if offset is less than 1", %{conn: conn} do
       address = insert(:address)
 
       6
@@ -821,7 +794,7 @@ defmodule BlockScoutWeb.API.RPC.AddressControllerTest do
       assert response["message"] == "OK"
     end
 
-    test "ignores pagination params if offset is over 10,000", %{conn: conn} do
+    test "ignores offset param if offset is over 10,000", %{conn: conn} do
       address = insert(:address)
 
       6

apps/block_scout_web/test/block_scout_web/controllers/api/rpc/contract_controller_test.exs

@@ -1,6 +1,190 @@
 defmodule BlockScoutWeb.API.RPC.ContractControllerTest do
   use BlockScoutWeb.ConnCase
 
+  describe "listcontracts" do
+    setup do
+      %{params: %{"module" => "contract", "action" => "listcontracts"}}
+    end
+
+    test "with an invalid filter value", %{conn: conn, params: params} do
+      response =
+        conn
+        |> get("/api", Map.put(params, "filter", "invalid"))
+        |> json_response(400)
+
+      assert response["message"] ==
+               "invalid is not a valid value for `filter`. Please use one of: verified, decompiled, unverified, not_decompiled, 1, 2, 3, 4."
+
+      assert response["status"] == "0"
+    end
+
+    test "with no contracts", %{conn: conn, params: params} do
+      response =
+        conn
+        |> get("/api", params)
+        |> json_response(200)
+
+      assert response["message"] == "OK"
+      assert response["status"] == "1"
+      assert response["result"] == []
+    end
+
+    test "with a verified smart contract, all contract information is shown", %{conn: conn, params: params} do
+      contract = insert(:smart_contract)
+
+      response =
+        conn
+        |> get("/api", params)
+        |> json_response(200)
+
+      assert response["message"] == "OK"
+      assert response["status"] == "1"
+
+      assert response["result"] == [
+               %{
+                 "ABI" => Jason.encode!(contract.abi),
+                 "Address" => to_string(contract.address_hash),
+                 "CompilerVersion" => contract.compiler_version,
+                 "ContractName" => contract.name,
+                 "DecompiledSourceCode" => "Contract source code not decompiled.",
+                 "DecompilerVersion" => "",
+                 "OptimizationUsed" => if(contract.optimization, do: "1", else: "0"),
+                 "SourceCode" => contract.contract_source_code
+               }
+             ]
+    end
+
+    test "with an unverified contract address, only basic information is shown", %{conn: conn, params: params} do
+      address = insert(:contract_address)
+
+      response =
+        conn
+        |> get("/api", params)
+        |> json_response(200)
+
+      assert response["message"] == "OK"
+      assert response["status"] == "1"
+
+      assert response["result"] == [
+               %{
+                 "ABI" => "Contract source code not verified",
+                 "Address" => to_string(address.hash),
+                 "CompilerVersion" => "",
+                 "ContractName" => "",
+                 "DecompiledSourceCode" => "Contract source code not decompiled.",
+                 "DecompilerVersion" => "",
+                 "OptimizationUsed" => "",
+                 "SourceCode" => ""
+               }
+             ]
+    end
+
+    test "filtering for only unverified contracts shows only unverified contracts", %{params: params, conn: conn} do
+      address = insert(:contract_address)
+      insert(:smart_contract)
+
+      response =
+        conn
+        |> get("/api", Map.put(params, "filter", "unverified"))
+        |> json_response(200)
+
+      assert response["message"] == "OK"
+      assert response["status"] == "1"
+
+      assert response["result"] == [
+               %{
+                 "ABI" => "Contract source code not verified",
+                 "Address" => to_string(address.hash),
+                 "CompilerVersion" => "",
+                 "ContractName" => "",
+                 "DecompiledSourceCode" => "Contract source code not decompiled.",
+                 "DecompilerVersion" => "",
+                 "OptimizationUsed" => "",
+                 "SourceCode" => ""
+               }
+             ]
+    end
+
+    test "filtering for only verified contracts shows only verified contracts", %{params: params, conn: conn} do
+      insert(:contract_address)
+      contract = insert(:smart_contract)
+
+      response =
+        conn
+        |> get("/api", Map.put(params, "filter", "verified"))
+        |> json_response(200)
+
+      assert response["message"] == "OK"
+      assert response["status"] == "1"
+
+      assert response["result"] == [
+               %{
+                 "ABI" => Jason.encode!(contract.abi),
+                 "Address" => to_string(contract.address_hash),
+                 "CompilerVersion" => contract.compiler_version,
+                 "DecompiledSourceCode" => "Contract source code not decompiled.",
+                 "DecompilerVersion" => "",
+                 "ContractName" => contract.name,
+                 "OptimizationUsed" => if(contract.optimization, do: "1", else: "0"),
+                 "SourceCode" => contract.contract_source_code
+               }
+             ]
+    end
+
+    test "filtering for only decompiled contracts shows only decompiled contracts", %{params: params, conn: conn} do
+      insert(:contract_address)
+      decompiled_smart_contract = insert(:decompiled_smart_contract)
+
+      response =
+        conn
+        |> get("/api", Map.put(params, "filter", "decompiled"))
+        |> json_response(200)
+
+      assert response["message"] == "OK"
+      assert response["status"] == "1"
+
+      assert response["result"] == [
+               %{
+                 "ABI" => "Contract source code not verified",
+                 "Address" => to_string(decompiled_smart_contract.address_hash),
+                 "CompilerVersion" => "",
+                 "ContractName" => "",
+                 "DecompiledSourceCode" => decompiled_smart_contract.decompiled_source_code,
+                 "DecompilerVersion" => "test_decompiler",
+                 "OptimizationUsed" => "",
+                 "SourceCode" => ""
+               }
+             ]
+    end
+
+    test "filtering for only not_decompiled (and by extension not verified contracts)", %{params: params, conn: conn} do
+      insert(:decompiled_smart_contract)
+      insert(:smart_contract)
+      contract_address = insert(:contract_address)
+
+      response =
+        conn
+        |> get("/api", Map.put(params, "filter", "not_decompiled"))
+        |> json_response(200)
+
+      assert response["message"] == "OK"
+      assert response["status"] == "1"
+
+      assert response["result"] == [
+               %{
+                 "ABI" => "Contract source code not verified",
+                 "Address" => to_string(contract_address.hash),
+                 "CompilerVersion" => "",
+                 "ContractName" => "",
+                 "DecompiledSourceCode" => "Contract source code not decompiled.",
+                 "DecompilerVersion" => "",
+                 "OptimizationUsed" => "",
+                 "SourceCode" => ""
+               }
+             ]
+    end
+  end
+
   describe "getabi" do
     test "with missing address hash", %{conn: conn} do
       params = %{
@@ -119,11 +303,14 @@ defmodule BlockScoutWeb.API.RPC.ContractControllerTest do
 
       expected_result = [
         %{
+          "Address" => "",
           "SourceCode" => "",
           "ABI" => "Contract source code not verified",
           "ContractName" => "",
           "CompilerVersion" => "",
-          "OptimizationUsed" => ""
+          "OptimizationUsed" => "",
+          "DecompiledSourceCode" => "",
+          "DecompilerVersion" => ""
         }
       ]
 
@@ -148,13 +335,16 @@ defmodule BlockScoutWeb.API.RPC.ContractControllerTest do
 
       expected_result = [
         %{
+          "Address" => to_string(contract.address_hash),
           "SourceCode" => contract.contract_source_code,
           "ABI" => Jason.encode!(contract.abi),
           "ContractName" => contract.name,
           "CompilerVersion" => contract.compiler_version,
+          "DecompiledSourceCode" => "Contract source code not decompiled.",
           # The contract's optimization value is true, so the expected value
           # for `OptimizationUsed` is "1". If it was false, the expected value
           # would be "0".
+          "DecompilerVersion" => "",
           "OptimizationUsed" => "1"
         }
       ]

apps/explorer/lib/explorer/application.ex

@@ -6,7 +6,7 @@ defmodule Explorer.Application do
   use Application
 
   alias Explorer.Admin
-  alias Explorer.Chain.BlockNumberCache
+  alias Explorer.Chain.{BlockNumberCache, TransactionCountCache}
   alias Explorer.Repo.PrometheusLogger
 
   @impl Application
@@ -27,7 +27,8 @@ defmodule Explorer.Application do
       Supervisor.child_spec({Task.Supervisor, name: Explorer.MarketTaskSupervisor}, id: Explorer.MarketTaskSupervisor),
       Supervisor.child_spec({Task.Supervisor, name: Explorer.TaskSupervisor}, id: Explorer.TaskSupervisor),
       {Registry, keys: :duplicate, name: Registry.ChainEvents, id: Registry.ChainEvents},
-      {Admin.Recovery, [[], [name: Admin.Recovery]]}
+      {Admin.Recovery, [[], [name: Admin.Recovery]]},
+      {TransactionCountCache, [[], []]}
     ]
 
     children = base_children ++ configurable_children()

apps/explorer/lib/explorer/chain.ex

@@ -20,7 +20,6 @@ defmodule Explorer.Chain do
 
   import EthereumJSONRPC, only: [integer_to_quantity: 1]
 
-  alias Ecto.Adapters.SQL
   alias Ecto.{Changeset, Multi}
 
   alias Explorer.Chain.{
@@ -40,6 +39,7 @@ defmodule Explorer.Chain do
     Token,
     TokenTransfer,
     Transaction,
+    TransactionCountCache,
     Wei
   }
 
@@ -1868,10 +1868,7 @@ defmodule Explorer.Chain do
   """
   @spec transaction_estimated_count() :: non_neg_integer()
   def transaction_estimated_count do
-    %Postgrex.Result{rows: [[rows]]} =
-      SQL.query!(Repo, "SELECT reltuples::BIGINT AS estimate FROM pg_class WHERE relname='transactions'")
-
-    rows
+    TransactionCountCache.value()
   end
 
   @doc """
@@ -2629,6 +2626,88 @@ defmodule Explorer.Chain do
     Repo.all(query, timeout: :infinity)
   end
 
+  def list_decompiled_contracts(limit, offset) do
+    query =
+      from(
+        address in Address,
+        join: decompiled_smart_contract in DecompiledSmartContract,
+        on: decompiled_smart_contract.address_hash == address.hash,
+        preload: [{:decompiled_smart_contract, decompiled_smart_contract}, :smart_contract],
+        order_by: [asc: address.inserted_at],
+        limit: ^limit,
+        offset: ^offset
+      )
+
+    Repo.all(query)
+  end
+
+  def list_verified_contracts(limit, offset) do
+    query =
+      from(
+        address in Address,
+        where: not is_nil(address.contract_code),
+        join: smart_contract in SmartContract,
+        on: smart_contract.address_hash == address.hash,
+        preload: [{:smart_contract, smart_contract}, :decompiled_smart_contract],
+        order_by: [asc: address.inserted_at],
+        limit: ^limit,
+        offset: ^offset
+      )
+
+    Repo.all(query)
+  end
+
+  def list_contracts(limit, offset) do
+    query =
+      from(
+        address in Address,
+        where: not is_nil(address.contract_code),
+        preload: [:smart_contract, :decompiled_smart_contract],
+        order_by: [asc: address.inserted_at],
+        limit: ^limit,
+        offset: ^offset
+      )
+
+    Repo.all(query)
+  end
+
+  def list_unverified_contracts(limit, offset) do
+    query =
+      from(
+        address in Address,
+        left_join: smart_contract in SmartContract,
+        on: smart_contract.address_hash == address.hash,
+        where: not is_nil(address.contract_code),
+        where: is_nil(smart_contract.address_hash),
+        preload: [{:smart_contract, smart_contract}, :decompiled_smart_contract],
+        order_by: [asc: address.inserted_at],
+        limit: ^limit,
+        offset: ^offset
+      )
+
+    Repo.all(query)
+  end
+
+  def list_not_decompiled_contracts(limit, offset) do
+    query =
+      from(
+        address in Address,
+        left_join: smart_contract in SmartContract,
+        on: smart_contract.address_hash == address.hash,
+        left_join: decompiled_smart_contract in DecompiledSmartContract,
+        on: decompiled_smart_contract.address_hash == address.hash,
+        preload: [smart_contract: smart_contract, decompiled_smart_contract: decompiled_smart_contract],
+        where: not is_nil(address.contract_code),
+        where: is_nil(smart_contract.address_hash),
+        where: is_nil(decompiled_smart_contract.address_hash),
+        order_by: [asc: address.inserted_at],
+        limit: ^limit,
+        offset: ^offset
+      )
+
+    Repo.all(query)
+  end
+
   @doc """
   Combined block reward from all the fees.
   """

apps/explorer/lib/explorer/chain/address.ex

@@ -8,7 +8,19 @@ defmodule Explorer.Chain.Address do
   use Explorer.Schema
 
   alias Ecto.Changeset
-  alias Explorer.Chain.{Address, Block, Data, Hash, InternalTransaction, SmartContract, Token, Transaction, Wei}
+
+  alias Explorer.Chain.{
+    Address,
+    Block,
+    Data,
+    DecompiledSmartContract,
+    Hash,
+    InternalTransaction,
+    SmartContract,
+    Token,
+    Transaction,
+    Wei
+  }
 
   @optional_attrs ~w(contract_code fetched_coin_balance fetched_coin_balance_block_number nonce)a
   @required_attrs ~w(hash)a
@@ -64,6 +76,7 @@ defmodule Explorer.Chain.Address do
     field(:nonce, :integer)
 
     has_one(:smart_contract, SmartContract)
+    has_one(:decompiled_smart_contract, DecompiledSmartContract)
     has_one(:token, Token, foreign_key: :contract_address_hash)
 
     has_one(

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

@@ -46,6 +46,7 @@ defmodule Explorer.Chain.Import.Runner.Blocks do
       |> Map.put(:timestamps, timestamps)
 
     ordered_consensus_block_numbers = ordered_consensus_block_numbers(changes_list)
+    where_invalid_parent = where_invalid_parent(changes_list)
     where_forked = where_forked(changes_list)
 
     multi
@@ -69,6 +70,9 @@ defmodule Explorer.Chain.Import.Runner.Blocks do
     |> Multi.run(:lose_consensus, fn repo, _ ->
       lose_consensus(repo, ordered_consensus_block_numbers, insert_options)
     end)
+    |> Multi.run(:lose_invalid_parent_consensus, fn repo, _ ->
+      lose_invalid_parent_consensus(repo, where_invalid_parent, insert_options)
+    end)
     |> Multi.run(:delete_address_token_balances, fn repo, _ ->
       delete_address_token_balances(repo, ordered_consensus_block_numbers, insert_options)
     end)
@@ -312,6 +316,32 @@ defmodule Explorer.Chain.Import.Runner.Blocks do
     end
   end
 
+  defp lose_invalid_parent_consensus(repo, where_invalid_parent, %{
+         timeout: timeout,
+         timestamps: %{updated_at: updated_at}
+       }) do
+    query =
+      from(
+        block in where_invalid_parent,
+        update: [
+          set: [
+            consensus: false,
+            updated_at: ^updated_at
+          ]
+        ],
+        select: [:hash, :number]
+      )
+
+    try do
+      {_, result} = repo.update_all(query, [], timeout: timeout)
+
+      {:ok, result}
+    rescue
+      postgrex_error in Postgrex.Error ->
+        {:error, %{exception: postgrex_error, where_invalid_parent: where_invalid_parent}}
+    end
+  end
+
   defp delete_address_token_balances(_, [], _), do: {:ok, []}
 
   defp delete_address_token_balances(repo, ordered_consensus_block_numbers, %{timeout: timeout}) do
@@ -543,12 +573,22 @@ defmodule Explorer.Chain.Import.Runner.Blocks do
     initial = from(t in Transaction, where: false)
 
     Enum.reduce(blocks_changes, initial, fn %{consensus: consensus, hash: hash, number: number}, acc ->
-      case consensus do
-        false ->
+      if consensus do
+        from(transaction in acc, or_where: transaction.block_hash != ^hash and transaction.block_number == ^number)
+      else
         from(transaction in acc, or_where: transaction.block_hash == ^hash and transaction.block_number == ^number)
+      end
+    end)
+  end
 
-        true ->
-          from(transaction in acc, or_where: transaction.block_hash != ^hash and transaction.block_number == ^number)
+  defp where_invalid_parent(blocks_changes) when is_list(blocks_changes) do
+    initial = from(b in Block, where: false)
+
+    Enum.reduce(blocks_changes, initial, fn %{consensus: consensus, parent_hash: parent_hash, number: number}, acc ->
+      if consensus do
+        from(block in acc, or_where: block.number == ^(number - 1) and block.hash != ^parent_hash)
+      else
+        acc
       end
     end)
   end

apps/explorer/lib/explorer/chain/smart_contract.ex

@@ -12,7 +12,8 @@ defmodule Explorer.Chain.SmartContract do
 
   use Explorer.Schema
 
-  alias Explorer.Chain.{Address, ContractMethod, Hash}
+  alias Explorer.Chain.{Address, ContractMethod, DecompiledSmartContract, Hash}
+  alias Explorer.Repo
 
   @typedoc """
   The name of a parameter to a function or event.
@@ -208,6 +209,12 @@ defmodule Explorer.Chain.SmartContract do
     field(:constructor_arguments, :string)
     field(:abi, {:array, :map})
 
+    has_one(
+      :decompiled_smart_contract,
+      DecompiledSmartContract,
+      foreign_key: :address_hash
+    )
+
     belongs_to(
       :address,
       Address,
@@ -219,6 +226,10 @@ defmodule Explorer.Chain.SmartContract do
     timestamps()
   end
 
+  def preload_decompiled_smart_contract(contract) do
+    Repo.preload(contract, :decompiled_smart_contract)
+  end
+
   def changeset(%__MODULE__{} = smart_contract, attrs) do
     smart_contract
     |> cast(attrs, [

apps/explorer/lib/explorer/chain/transaction_count_cache.ex

@@ -0,0 +1,154 @@
+defmodule Explorer.Chain.TransactionCountCache do
+  @moduledoc """
+  Cache for estimated transaction count.
+  """
+
+  require Logger
+
+  use GenServer
+
+  alias Explorer.Chain.Transaction
+  alias Explorer.Repo
+
+  # 2 hours
+  @cache_period 1_000 * 60 * 60 * 2
+  @default_value 0
+  @key "count"
+  @name __MODULE__
+
+  def start_link([params, gen_server_options]) do
+    name = gen_server_options[:name] || @name
+    params_with_name = Keyword.put(params, :name, name)
+
+    GenServer.start_link(__MODULE__, params_with_name, name: name)
+  end
+
+  def init(params) do
+    cache_period = period_from_env_var() || params[:cache_period] || @cache_period
+    current_value = params[:default_value] || @default_value
+    name = params[:name]
+
+    init_ets_table(name)
+
+    schedule_cache_update()
+
+    {:ok, {{cache_period, current_value, name}, nil}}
+  end
+
+  def value(process_name \\ __MODULE__) do
+    GenServer.call(process_name, :value)
+  end
+
+  def handle_call(:value, _, {{cache_period, default_value, name}, task}) do
+    {value, task} =
+      case cached_values(name) do
+        nil ->
+          {default_value, update_cache(task, name)}
+
+        {cached_value, timestamp} ->
+          task =
+            if current_time() - timestamp > cache_period do
+              update_cache(task, name)
+            end
+
+          {cached_value, task}
+      end
+
+    {:reply, value, {{cache_period, default_value, name}, task}}
+  end
+
+  def update_cache(nil, name) do
+    async_update_cache(name)
+  end
+
+  def update_cache(task, _) do
+    task
+  end
+
+  def handle_cast({:update_cache, value}, {{cache_period, default_value, name}, _}) do
+    current_time = current_time()
+    tuple = {value, current_time}
+
+    table_name = table_name(name)
+
+    :ets.insert(table_name, {@key, tuple})
+
+    {:noreply, {{cache_period, default_value, name}, nil}}
+  end
+
+  def handle_info({:DOWN, _, _, _, _}, {{cache_period, default_value, name}, _}) do
+    {:noreply, {{cache_period, default_value, name}, nil}}
+  end
+
+  def handle_info(_, {{cache_period, default_value, name}, _}) do
+    {:noreply, {{cache_period, default_value, name}, nil}}
+  end
+
+  # sobelow_skip ["DOS"]
+  defp table_name(name) do
+    name
+    |> Atom.to_string()
+    |> Macro.underscore()
+    |> String.to_atom()
+  end
+
+  def async_update_cache(name) do
+    Task.async(fn ->
+      try do
+        result = Repo.aggregate(Transaction, :count, :hash, timeout: :infinity)
+
+        GenServer.cast(name, {:update_cache, result})
+      rescue
+        e ->
+          Logger.debug([
+            "Coudn't update transaction count test #{inspect(e)}"
+          ])
+      end
+    end)
+  end
+
+  defp init_ets_table(name) do
+    table_name = table_name(name)
+
+    if :ets.whereis(table_name) == :undefined do
+      :ets.new(table_name, [
+        :set,
+        :named_table,
+        :public,
+        write_concurrency: true
+      ])
+    end
+  end
+
+  defp cached_values(name) do
+    table_name = table_name(name)
+
+    case :ets.lookup(table_name, @key) do
+      [{_, cached_values}] -> cached_values
+      _ -> nil
+    end
+  end
+
+  defp schedule_cache_update do
+    Process.send_after(self(), :update_cache, 2_000)
+  end
+
+  defp current_time do
+    utc_now = DateTime.utc_now()
+
+    DateTime.to_unix(utc_now, :millisecond)
+  end
+
+  defp period_from_env_var do
+    case System.get_env("TXS_COUNT_CACHE_PERIOD") do
+      value when is_binary(value) ->
+        case Integer.parse(value) do
+          {integer, ""} -> integer * 1_000 * 60 * 60
+          _ -> nil
+        end
+
+      _ ->
+        nil
+    end
+  end
+end

apps/explorer/priv/repo/migrations/scripts/20190326202921_lose_consensus_for_invalid_blocks.sql

@@ -0,0 +1,6 @@
+UPDATE blocks SET consensus = FALSE, updated_at = NOW()
+WHERE consensus AND number IN (
+  SELECT b0.number - 1 FROM "blocks" AS b0
+  LEFT JOIN "blocks" AS b1 ON (b0."parent_hash" = b1."hash") AND b1."consensus"
+  WHERE b0."number" > 0 AND b0."consensus" AND b1."hash" IS NULL
+);

apps/explorer/test/explorer/chain/import/runner/blocks_test.exs

@@ -8,6 +8,7 @@ defmodule Explorer.Chain.Import.Runner.BlocksTest do
   alias Ecto.Multi
   alias Explorer.Chain.Import.Runner.{Blocks, Transaction}
   alias Explorer.Chain.{Address, Block, Transaction}
+  alias Explorer.Chain
   alias Explorer.Repo
 
   describe "run/1" do
@@ -258,6 +259,36 @@ defmodule Explorer.Chain.Import.Runner.BlocksTest do
                 blocks_update_token_holder_counts: []
               }} = run_block_consensus_change(block, true, options)
     end
+
+    # Regression test for https://github.com/poanetwork/blockscout/issues/1644
+    test "discards parent block if it isn't related to the current one because of reorg",
+         %{consensus_block: %Block{number: block_number, hash: block_hash, miner_hash: miner_hash}, options: options} do
+      old_block = insert(:block, parent_hash: block_hash, number: block_number + 1)
+      insert(:block, parent_hash: old_block.hash, number: old_block.number + 1)
+
+      new_block1 = params_for(:block, parent_hash: block_hash, number: block_number + 1, miner_hash: miner_hash)
+
+      new_block2 =
+        params_for(:block, parent_hash: new_block1.hash, number: new_block1.number + 1, miner_hash: miner_hash)
+
+      %Ecto.Changeset{valid?: true, changes: block_changes} = Block.changeset(%Block{}, new_block2)
+      changes_list = [block_changes]
+
+      Multi.new()
+      |> Blocks.run(changes_list, options)
+      |> Repo.transaction()
+
+      assert Chain.missing_block_number_ranges(block_number..new_block2.number) == [old_block.number..old_block.number]
+
+      %Ecto.Changeset{valid?: true, changes: block_changes} = Block.changeset(%Block{}, new_block1)
+      changes_list = [block_changes]
+
+      Multi.new()
+      |> Blocks.run(changes_list, options)
+      |> Repo.transaction()
+
+      assert Chain.missing_block_number_ranges(block_number..new_block2.number) == []
+    end
   end
 
   defp count(schema) do

apps/explorer/test/explorer/chain/transaction_count_cache_test.exs

@@ -0,0 +1,54 @@
+defmodule Explorer.Chain.TransactionCountCacheTest do
+  use Explorer.DataCase
+
+  alias Explorer.Chain.TransactionCountCache
+
+  test "returns default transaction count" do
+    TransactionCountCache.start_link([[], [name: TestCache]])
+
+    result = TransactionCountCache.value(TestCache)
+
+    assert result == 0
+  end
+
+  test "updates cache if initial value is zero" do
+    TransactionCountCache.start_link([[], [name: TestCache]])
+
+    insert(:transaction)
+    insert(:transaction)
+
+    _result = TransactionCountCache.value(TestCache)
+
+    Process.sleep(1000)
+
+    updated_value = TransactionCountCache.value(TestCache)
+
+    assert updated_value == 2
+  end
+
+  test "does not update cache if cache period did not pass" do
+    TransactionCountCache.start_link([[], [name: TestCache]])
+
+    insert(:transaction)
+    insert(:transaction)
+
+    _result = TransactionCountCache.value(TestCache)
+
+    Process.sleep(1000)
+
+    updated_value = TransactionCountCache.value(TestCache)
+
+    assert updated_value == 2
+
+    insert(:transaction)
+    insert(:transaction)
+
+    _updated_value = TransactionCountCache.value(TestCache)
+
+    Process.sleep(1000)
+
+    updated_value = TransactionCountCache.value(TestCache)
+
+    assert updated_value == 2
+  end
+end