Merge pull request #1560 from poanetwork/gs-batch-token-balance-requests
Allow executing smart contract functions in arbitrarily sized batchespull/1562/head
Victor Baranov
6 years ago
committed by
GitHub
commit
5d5b8fa84d
@ -1,6 +1,6 @@ |
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:0: Unknown function 'Elixir.ExUnit.Callbacks':'__merge__'/3 |
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:0: Unknown function 'Elixir.ExUnit.CaseTemplate':'__proxy__'/2 |
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:0: Unknown type 'Elixir.Map':t/0 |
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apps/ethereum_jsonrpc/lib/ethereum_jsonrpc.ex:413: Function timestamp_to_datetime/1 has no local return |
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apps/ethereum_jsonrpc/lib/ethereum_jsonrpc.ex:390: Function timestamp_to_datetime/1 has no local return |
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apps/explorer/lib/explorer/repo/prometheus_logger.ex:8: Function microseconds_time/1 has no local return |
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apps/explorer/lib/explorer/repo/prometheus_logger.ex:8: The call 'Elixir.System':convert_time_unit(__@1::any(),'native','microseconds') breaks the contract (integer(),time_unit() | 'native',time_unit() | 'native') -> integer() |
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@ -0,0 +1,94 @@ |
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defmodule EthereumJSONRPC.Contract do |
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@moduledoc """ |
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Smart contract functions executed by `eth_call`. |
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""" |
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|
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import EthereumJSONRPC, only: [integer_to_quantity: 1, json_rpc: 2, request: 1] |
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alias EthereumJSONRPC.Encoder |
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@typedoc """ |
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Call to a smart contract function. |
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|
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* `:block_number` - the block in which to execute the function. Defaults to the `nil` to indicate |
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the latest block as determined by the remote node, which may differ from the latest block number |
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in `Explorer.Chain`. |
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""" |
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@type call :: %{ |
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required(:contract_address) => String.t(), |
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required(:function_name) => String.t(), |
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required(:args) => [term()], |
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optional(:block_number) => EthereumJSONRPC.block_number() |
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} |
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|
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@typedoc """ |
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Result of calling a smart contract function. |
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""" |
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@type call_result :: {:ok, term()} | {:error, String.t()} |
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|
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@spec execute_contract_functions([call()], [map()], EthereumJSONRPC.json_rpc_named_arguments()) :: [call_result()] |
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def execute_contract_functions(requests, abi, json_rpc_named_arguments) do |
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functions = |
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abi |
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|> ABI.parse_specification() |
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|> Enum.into(%{}, &{&1.function, &1}) |
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requests_with_index = Enum.with_index(requests) |
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indexed_responses = |
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requests_with_index |
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|> Enum.map(fn {%{contract_address: contract_address, function_name: function_name, args: args} = request, index} -> |
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functions[function_name] |
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|> Encoder.encode_function_call(args) |
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|> eth_call_request(contract_address, index, Map.get(request, :block_number)) |
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end) |
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|> json_rpc(json_rpc_named_arguments) |
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|> case do |
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{:ok, responses} -> responses |
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{:error, {:bad_gateway, _request_url}} -> raise "Bad gateway" |
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{:error, error} -> raise error |
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end |
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|> Enum.into(%{}, &{&1.id, &1}) |
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|
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Enum.map(requests_with_index, fn {%{function_name: function_name}, index} -> |
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indexed_responses[index] |
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|> case do |
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nil -> |
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{:error, "No result"} |
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|
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response -> |
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{^index, result} = Encoder.decode_result(response, functions[function_name]) |
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result |
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end |
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end) |
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rescue |
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error -> |
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Enum.map(requests, fn _ -> format_error(error) end) |
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end |
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defp eth_call_request(data, contract_address, id, block_number) do |
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block = |
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case block_number do |
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nil -> "latest" |
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block_number -> integer_to_quantity(block_number) |
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end |
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|
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request(%{ |
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id: id, |
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method: "eth_call", |
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params: [%{to: contract_address, data: data}, block] |
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}) |
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end |
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|
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defp format_error(message) when is_binary(message) do |
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{:error, message} |
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end |
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|
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defp format_error(%{message: error_message}) do |
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format_error(error_message) |
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end |
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defp format_error(error) do |
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format_error(Exception.message(error)) |
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end |
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end |
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@ -0,0 +1,134 @@ |
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defmodule EthereumJSONRPC.ContractTest do |
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use ExUnit.Case, async: true |
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doctest EthereumJSONRPC.Contract |
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import Mox |
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describe "execute_contract_functions/3" do |
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test "executes the functions with and without the block_number, returns results in order" do |
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json_rpc_named_arguments = Application.get_env(:explorer, :json_rpc_named_arguments) |
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abi = [ |
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%{ |
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"constant" => false, |
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"inputs" => [], |
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"name" => "get1", |
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"outputs" => [%{"name" => "", "type" => "uint256"}], |
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"payable" => false, |
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"stateMutability" => "nonpayable", |
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"type" => "function" |
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}, |
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%{ |
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"constant" => true, |
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"inputs" => [], |
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"name" => "get2", |
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"outputs" => [%{"name" => "", "type" => "uint256"}], |
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"payable" => false, |
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"stateMutability" => "view", |
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"type" => "function" |
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}, |
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%{ |
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"constant" => true, |
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"inputs" => [], |
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"name" => "get3", |
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"outputs" => [%{"name" => "", "type" => "uint256"}], |
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"payable" => false, |
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"stateMutability" => "view", |
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"type" => "function" |
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} |
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] |
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contract_address = "0x0000000000000000000000000000000000000000" |
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functions = [ |
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%{contract_address: contract_address, function_name: "get1", args: []}, |
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%{contract_address: contract_address, function_name: "get2", args: [], block_number: 1000}, |
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%{contract_address: contract_address, function_name: "get3", args: []} |
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] |
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|
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expect( |
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EthereumJSONRPC.Mox, |
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:json_rpc, |
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fn requests, _options -> |
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{:ok, |
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requests |
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|> Enum.map(fn |
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%{id: id, method: "eth_call", params: [%{data: "0x054c1a75", to: ^contract_address}, "latest"]} -> |
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%{ |
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id: id, |
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result: "0x000000000000000000000000000000000000000000000000000000000000002a" |
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} |
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|
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%{id: id, method: "eth_call", params: [%{data: "0xd2178b08", to: ^contract_address}, "0x3E8"]} -> |
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%{ |
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id: id, |
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result: "0x0000000000000000000000000000000000000000000000000000000000000034" |
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} |
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|
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%{id: id, method: "eth_call", params: [%{data: "0x8321045c", to: ^contract_address}, "latest"]} -> |
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%{ |
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id: id, |
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error: %{code: -32015, data: "something", message: "Some error"} |
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} |
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end) |
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|> Enum.shuffle()} |
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end |
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) |
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blockchain_result = [ |
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{:ok, [42]}, |
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{:ok, [52]}, |
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{:error, "(-32015) Some error"} |
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] |
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assert EthereumJSONRPC.execute_contract_functions( |
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functions, |
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abi, |
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json_rpc_named_arguments |
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) == blockchain_result |
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end |
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|
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test "returns errors if JSONRPC request fails" do |
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json_rpc_named_arguments = Application.get_env(:explorer, :json_rpc_named_arguments) |
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abi = [ |
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%{ |
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"constant" => false, |
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"inputs" => [], |
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"name" => "get", |
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"outputs" => [%{"name" => "", "type" => "uint256"}], |
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"payable" => false, |
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"stateMutability" => "nonpayable", |
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"type" => "function" |
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} |
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] |
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contract_address = "0x0000000000000000000000000000000000000000" |
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functions = [ |
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%{contract_address: contract_address, function_name: "get", args: []}, |
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%{contract_address: contract_address, function_name: "get", args: [], block_number: 1000} |
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] |
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|
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expect( |
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EthereumJSONRPC.Mox, |
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:json_rpc, |
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fn _requests, _options -> |
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{:error, "Some error"} |
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end |
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) |
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blockchain_result = [ |
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{:error, "Some error"}, |
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{:error, "Some error"} |
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] |
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assert EthereumJSONRPC.execute_contract_functions( |
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functions, |
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abi, |
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json_rpc_named_arguments |
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) == blockchain_result |
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end |
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end |
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end |
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