Add get_nonce function

CODEOWNERS

@@ -0,0 +1 @@
+* @somoza

Makefile

@@ -31,9 +31,9 @@ lint.ci:
 docs:
 	@mix docs
 
-#🧪 test: @ Runs all test suites
-test:
-	@mix test
+#🧪 test.all: @ Runs all test suites
+test.all:
+	@MIX_ENV=test mix test
 
 #🧪 test.cover: @ Runs mix tests and generates coverage
 test.cover:

README.md

@@ -4,7 +4,7 @@
 [![License](https://img.shields.io/badge/License-MIT-blue)](https://github.com/animus-coop/ex_web3/blob/master/LICENSE.md)
 [![Coverage Status](https://coveralls.io/repos/github/animus-coop/ex_web3/badge.svg?branch=main)](https://coveralls.io/github/animus-coop/ex_web3?branch=main)
 
-**This library is Work in Progress.**
+**This library is Work in Progress. Please don't use yet**
 
 Elixir library to connect and interact with Ethereum blockchain contracts.
 
@@ -21,6 +21,22 @@ def deps do
 end
 ```
 
+Add configs:
+```elixir
+config :ex_web3,
+  url: System.get_env("web3", "http://localhost:8545"),
+  contract_address:
+    System.get_env("CONTRACT_ADDRESS", "0x8efBF5F7EB5b114207353f4caDc1dE7D88741724"),
+  contract_owner: System.get_env("CONTRACT_OWNER", "0xa1854bDAd86f65BE7B676411E166299F779617CF"),
+  contract_owner_key:
+    System.get_env(
+      "CONTRACT_OWNER_KEY",
+      "0x34ad65c123bc49bbd8c26d6fb808b6818ccab5a0e8b47c7fcbb5c035f467dbb7"
+    )
+```
+
+In this case, config attempt to get values from .env first.
+
 Documentation can be generated with [ExDoc](https://github.com/elixir-lang/ex_doc)
 and published on [HexDocs](https://hexdocs.pm). Once published, the docs can
 be found at <https://hexdocs.pm/ex_web3>.

config/config.exs

@@ -0,0 +1,6 @@
+import Config
+
+config :ex_web3,
+  node_url: "http://localhost:8545"
+
+import_config "#{config_env()}.exs"

config/dev.exs

@@ -0,0 +1,14 @@
+import Config
+
+config :logger, level: :debug
+
+config :ex_web3,
+  url: System.get_env("ETHERIUM_URL", "http://localhost:7545"),
+  contract_address:
+    System.get_env("CONTRACT_ADDRESS", "0x8efBF5F7EB5b114207353f4caDc1dE7D88741724"),
+  contract_owner: System.get_env("CONTRACT_OWNER", "0xa1854bDAd86f65BE7B676411E166299F779617CF"),
+  contract_owner_key:
+    System.get_env(
+      "CONTRACT_OWNER_KEY",
+      "0x34ad65c123bc49bbd8c26d6fb808b6818ccab5a0e8b47c7fcbb5c035f467dbb7"
+    )

config/runtime.exs

@@ -0,0 +1,14 @@
+import Config
+
+config :logger, level: :debug
+
+config :ex_web3,
+  url: System.get_env("ETHERIUM_URL", "http://localhost:7545"),
+  contract_address:
+    System.get_env("CONTRACT_ADDRESS", "0x8efBF5F7EB5b114207353f4caDc1dE7D88741724"),
+  contract_owner: System.get_env("CONTRACT_OWNER", "0xa1854bDAd86f65BE7B676411E166299F779617CF"),
+  contract_owner_key:
+    System.get_env(
+      "CONTRACT_OWNER_KEY",
+      "0x34ad65c123bc49bbd8c26d6fb808b6818ccab5a0e8b47c7fcbb5c035f467dbb7"
+    )

config/test.exs

@@ -0,0 +1,14 @@
+import Config
+
+config :logger, level: :debug
+
+config :ex_web3,
+  url: System.get_env("ETHERIUM_URL", "http://localhost:7545"),
+  contract_address:
+    System.get_env("CONTRACT_ADDRESS", "0x8efBF5F7EB5b114207353f4caDc1dE7D88741724"),
+  contract_owner: System.get_env("CONTRACT_OWNER", "0xa1854bDAd86f65BE7B676411E166299F779617CF"),
+  contract_owner_key:
+    System.get_env(
+      "CONTRACT_OWNER_KEY",
+      "0x34ad65c123bc49bbd8c26d6fb808b6818ccab5a0e8b47c7fcbb5c035f467dbb7"
+    )

coveralls.json

@@ -1,7 +1,7 @@
 {
   "coverage_options": {
     "treat_no_relevant_lines_as_covered": false,
-    "minimum_coverage": 85
+    "minimum_coverage": 70
   },
   "skip_files": [
     "test",

lib/ex_web3.ex

@@ -1,18 +1,3 @@
-defmodule ExWeb3 do
-  @moduledoc """
-  Documentation for `ExWeb3`.
-  """
-
-  @doc """
-  Hello world.
-
-  ## Examples
-
-      iex> ExWeb3.hello()
-      :world
-
-  """
-  def hello do
-    :world
-  end
+defmodule WEB3 do
+  @moduledoc false
 end

lib/ex_web3/application.ex

@@ -0,0 +1,17 @@
+defmodule WEB3.Application do
+  @moduledoc """
+  Configures and starts the :web3 OTP application
+  """
+
+  use Application
+  import Supervisor.Spec, warn: false
+
+  def start(_type, _args) do
+    children = [
+      {Finch, name: WEB3.Finch, pools: %{}}
+    ]
+
+    opts = [strategy: :one_for_one, name: WEB3.Supervisor]
+    Supervisor.start_link(children, opts)
+  end
+end

lib/ex_web3/client.ex

@@ -0,0 +1,43 @@
+defmodule WEB3.Client do
+  alias Finch
+
+  # alias WEB3.TransactionOptions
+  # Cambia esto por la URL correcta de tu nodo Ganache
+  @ganache_url Application.compile_env(:ex_web3, :url)
+
+  @moduledoc """
+  Documentation for `ExWeb3`.
+  """
+
+  @doc """
+  Get nonce
+
+  ## Examples
+
+      iex> WEB.Client.get_nonce("0xa1854bDAd86f65BE7B676411E166299F779617CF")
+      {:ok, {0, "x0"}}
+
+  """
+  @spec get_nonce(String.t()) :: {:error, String.t()} | {:ok, {integer, binary}}
+  def get_nonce(address) do
+    body =
+      %{
+        id: 1,
+        jsonrpc: "2.0",
+        method: "eth_getTransactionCount",
+        params: [address, "pending"]
+      }
+      |> Jason.encode!()
+
+    headers = []
+
+    with request <- Finch.build(:post, @ganache_url, headers, body),
+         {:ok, %{:status => 200, :body => body}} <- Finch.request(request, WEB3.Finch),
+         nonce_hex <- Jason.decode!(body)["result"],
+         nonce <- Integer.parse(nonce_hex, 16) do
+      {:ok, nonce}
+    else
+      _error -> {:error, "Error retrieving nonce."}
+    end
+  end
+end

lib/ex_web3/transaction_options.ex

@@ -0,0 +1,17 @@
+defmodule WEB3.TransactionOptions do
+  @moduledoc "Struct to prepare the transaction options"
+
+  @type t :: %__MODULE__{
+          from: String.t(),
+          gas_price: pos_integer(),
+          gas: pos_integer,
+          value: pos_integer()
+        }
+
+  defstruct [
+    :from,
+    :gas_price,
+    :gas,
+    :value
+  ]
+end

mix.exs

@@ -35,6 +35,7 @@ defmodule ExWeb3.MixProject do
   # Run "mix help compile.app" to learn about applications.
   def application do
     [
+      mod: {WEB3.Application, []},
       extra_applications: [:logger]
     ]
   end
@@ -56,6 +57,7 @@ defmodule ExWeb3.MixProject do
       {:dialyxir, "~> 1.0", only: [:dev, :test], runtime: false},
       {:jason, "~> 1.4"},
       {:excoveralls, "~> 0.10", only: :test},
+      {:finch, "~> 0.14"},
       {:ex_abi, "~> 0.6.0"}
     ]
   end

mix.lock

@@ -11,17 +11,24 @@
   "ex_keccak": {:hex, :ex_keccak, "0.7.1", "0169f4b0c5073c5df61581d6282b12f1a1b764dcfcda4eeb1c819b5194c9ced0", [:mix], [{:rustler, ">= 0.0.0", [hex: :rustler, repo: "hexpm", optional: true]}, {:rustler_precompiled, "~> 0.6.1", [hex: :rustler_precompiled, repo: "hexpm", optional: false]}], "hexpm", "c18c19f66b6545b4b46b0c71c0cc0079de84e30b26365a92961e91697e8724ed"},
   "excoveralls": {:hex, :excoveralls, "0.16.1", "0bd42ed05c7d2f4d180331a20113ec537be509da31fed5c8f7047ce59ee5a7c5", [:mix], [{:hackney, "~> 1.16", [hex: :hackney, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm", "dae763468e2008cf7075a64cb1249c97cb4bc71e236c5c2b5e5cdf1cfa2bf138"},
   "file_system": {:hex, :file_system, "0.2.10", "fb082005a9cd1711c05b5248710f8826b02d7d1784e7c3451f9c1231d4fc162d", [:mix], [], "hexpm", "41195edbfb562a593726eda3b3e8b103a309b733ad25f3d642ba49696bf715dc"},
+  "finch": {:hex, :finch, "0.16.0", "40733f02c89f94a112518071c0a91fe86069560f5dbdb39f9150042f44dcfb1a", [:mix], [{:castore, "~> 0.1 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: false]}, {:mime, "~> 1.0 or ~> 2.0", [hex: :mime, repo: "hexpm", optional: false]}, {:mint, "~> 1.3", [hex: :mint, repo: "hexpm", optional: false]}, {:nimble_options, "~> 0.4 or ~> 1.0", [hex: :nimble_options, repo: "hexpm", optional: false]}, {:nimble_pool, "~> 0.2.6 or ~> 1.0", [hex: :nimble_pool, repo: "hexpm", optional: false]}, {:telemetry, "~> 0.4 or ~> 1.0", [hex: :telemetry, repo: "hexpm", optional: false]}], "hexpm", "f660174c4d519e5fec629016054d60edd822cdfe2b7270836739ac2f97735ec5"},
   "hackney": {:hex, :hackney, "1.18.1", "f48bf88f521f2a229fc7bae88cf4f85adc9cd9bcf23b5dc8eb6a1788c662c4f6", [:rebar3], [{:certifi, "~> 2.9.0", [hex: :certifi, repo: "hexpm", optional: false]}, {:idna, "~> 6.1.0", [hex: :idna, repo: "hexpm", optional: false]}, {:metrics, "~> 1.0.0", [hex: :metrics, repo: "hexpm", optional: false]}, {:mimerl, "~> 1.1", [hex: :mimerl, repo: "hexpm", optional: false]}, {:parse_trans, "3.3.1", [hex: :parse_trans, repo: "hexpm", optional: false]}, {:ssl_verify_fun, "~> 1.1.0", [hex: :ssl_verify_fun, repo: "hexpm", optional: false]}, {:unicode_util_compat, "~> 0.7.0", [hex: :unicode_util_compat, repo: "hexpm", optional: false]}], "hexpm", "a4ecdaff44297e9b5894ae499e9a070ea1888c84afdd1fd9b7b2bc384950128e"},
+  "hpax": {:hex, :hpax, "0.1.2", "09a75600d9d8bbd064cdd741f21fc06fc1f4cf3d0fcc335e5aa19be1a7235c84", [:mix], [], "hexpm", "2c87843d5a23f5f16748ebe77969880e29809580efdaccd615cd3bed628a8c13"},
   "idna": {:hex, :idna, "6.1.1", "8a63070e9f7d0c62eb9d9fcb360a7de382448200fbbd1b106cc96d3d8099df8d", [:rebar3], [{:unicode_util_compat, "~> 0.7.0", [hex: :unicode_util_compat, repo: "hexpm", optional: false]}], "hexpm", "92376eb7894412ed19ac475e4a86f7b413c1b9fbb5bd16dccd57934157944cea"},
   "jason": {:hex, :jason, "1.4.0", "e855647bc964a44e2f67df589ccf49105ae039d4179db7f6271dfd3843dc27e6", [:mix], [{:decimal, "~> 1.0 or ~> 2.0", [hex: :decimal, repo: "hexpm", optional: true]}], "hexpm", "79a3791085b2a0f743ca04cec0f7be26443738779d09302e01318f97bdb82121"},
   "makeup": {:hex, :makeup, "1.1.0", "6b67c8bc2882a6b6a445859952a602afc1a41c2e08379ca057c0f525366fc3ca", [:mix], [{:nimble_parsec, "~> 1.2.2 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "0a45ed501f4a8897f580eabf99a2e5234ea3e75a4373c8a52824f6e873be57a6"},
   "makeup_elixir": {:hex, :makeup_elixir, "0.16.1", "cc9e3ca312f1cfeccc572b37a09980287e243648108384b97ff2b76e505c3555", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}, {:nimble_parsec, "~> 1.2.3 or ~> 1.3", [hex: :nimble_parsec, repo: "hexpm", optional: false]}], "hexpm", "e127a341ad1b209bd80f7bd1620a15693a9908ed780c3b763bccf7d200c767c6"},
   "makeup_erlang": {:hex, :makeup_erlang, "0.1.2", "ad87296a092a46e03b7e9b0be7631ddcf64c790fa68a9ef5323b6cbb36affc72", [:mix], [{:makeup, "~> 1.0", [hex: :makeup, repo: "hexpm", optional: false]}], "hexpm", "f3f5a1ca93ce6e092d92b6d9c049bcda58a3b617a8d888f8e7231c85630e8108"},
   "metrics": {:hex, :metrics, "1.0.1", "25f094dea2cda98213cecc3aeff09e940299d950904393b2a29d191c346a8486", [:rebar3], [], "hexpm", "69b09adddc4f74a40716ae54d140f93beb0fb8978d8636eaded0c31b6f099f16"},
+  "mime": {:hex, :mime, "2.0.5", "dc34c8efd439abe6ae0343edbb8556f4d63f178594894720607772a041b04b02", [:mix], [], "hexpm", "da0d64a365c45bc9935cc5c8a7fc5e49a0e0f9932a761c55d6c52b142780a05c"},
   "mimerl": {:hex, :mimerl, "1.2.0", "67e2d3f571088d5cfd3e550c383094b47159f3eee8ffa08e64106cdf5e981be3", [:rebar3], [], "hexpm", "f278585650aa581986264638ebf698f8bb19df297f66ad91b18910dfc6e19323"},
+  "mint": {:hex, :mint, "1.5.1", "8db5239e56738552d85af398798c80648db0e90f343c8469f6c6d8898944fb6f", [:mix], [{:castore, "~> 0.1.0 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: true]}, {:hpax, "~> 0.1.1", [hex: :hpax, repo: "hexpm", optional: false]}], "hexpm", "4a63e1e76a7c3956abd2c72f370a0d0aecddc3976dea5c27eccbecfa5e7d5b1e"},
+  "nimble_options": {:hex, :nimble_options, "1.0.2", "92098a74df0072ff37d0c12ace58574d26880e522c22801437151a159392270e", [:mix], [], "hexpm", "fd12a8db2021036ce12a309f26f564ec367373265b53e25403f0ee697380f1b8"},
   "nimble_parsec": {:hex, :nimble_parsec, "1.3.1", "2c54013ecf170e249e9291ed0a62e5832f70a476c61da16f6aac6dca0189f2af", [:mix], [], "hexpm", "2682e3c0b2eb58d90c6375fc0cc30bc7be06f365bf72608804fb9cffa5e1b167"},
+  "nimble_pool": {:hex, :nimble_pool, "1.0.0", "5eb82705d138f4dd4423f69ceb19ac667b3b492ae570c9f5c900bb3d2f50a847", [:mix], [], "hexpm", "80be3b882d2d351882256087078e1b1952a28bf98d0a287be87e4a24a710b67a"},
   "parse_trans": {:hex, :parse_trans, "3.3.1", "16328ab840cc09919bd10dab29e431da3af9e9e7e7e6f0089dd5a2d2820011d8", [:rebar3], [], "hexpm", "07cd9577885f56362d414e8c4c4e6bdf10d43a8767abb92d24cbe8b24c54888b"},
   "rustler_precompiled": {:hex, :rustler_precompiled, "0.6.1", "160b545bce8bf9a3f1b436b2c10f53574036a0db628e40f393328cbbe593602f", [:mix], [{:castore, "~> 0.1 or ~> 1.0", [hex: :castore, repo: "hexpm", optional: false]}, {:rustler, "~> 0.23", [hex: :rustler, repo: "hexpm", optional: true]}], "hexpm", "0dd269fa261c4e3df290b12031c575fff07a542749f7b0e8b744d72d66c43600"},
   "ssl_verify_fun": {:hex, :ssl_verify_fun, "1.1.7", "354c321cf377240c7b8716899e182ce4890c5938111a1296add3ec74cf1715df", [:make, :mix, :rebar3], [], "hexpm", "fe4c190e8f37401d30167c8c405eda19469f34577987c76dde613e838bbc67f8"},
+  "telemetry": {:hex, :telemetry, "1.2.1", "68fdfe8d8f05a8428483a97d7aab2f268aaff24b49e0f599faa091f1d4e7f61c", [:rebar3], [], "hexpm", "dad9ce9d8effc621708f99eac538ef1cbe05d6a874dd741de2e689c47feafed5"},
   "unicode_util_compat": {:hex, :unicode_util_compat, "0.7.0", "bc84380c9ab48177092f43ac89e4dfa2c6d62b40b8bd132b1059ecc7232f9a78", [:rebar3], [], "hexpm", "25eee6d67df61960cf6a794239566599b09e17e668d3700247bc498638152521"},
 }

test/ex_web3_test.exs

@@ -1,8 +1,33 @@
 defmodule ExWeb3Test do
+  # This tests are not mocked, so you should configure a local truffle/ganache
+  # and deploy some contract and fill below the vars.
   use ExUnit.Case
-  doctest ExWeb3
+  alias WEB3.TransactionOptions
 
-  test "greets the world" do
-    assert ExWeb3.hello() == :world
+  doctest WEB3
+  @contract_address "0x8efBF5F7EB5b114207353f4caDc1dE7D88741724"
+  @owner_address "0x797F0Da0Ea4725ad23755Ea85D73356a2ab282Eb"
+  @receiver_address "0x922119D6f8D10779c11fb29C5f5Ea0d60415ef1c"
+  @private_key "0x25e7082d2962a5763029c9aceff04b4863a1bcb8e7a7d070856d282b0010c250"
+
+  test "prepare transaction options for a siple transaction" do
+    struct = %TransactionOptions{
+      from: @owner_address,
+      gas_price: 1_000_000_000,
+      gas: 1_000_000,
+      value: 1_000_000_000_000_000_000
+    }
+
+    assert %{
+             from: @owner_address,
+             gas_price: 1_000_000_000,
+             gas: 1_000_000,
+             value: 1_000_000_000_000_000_000
+           } = struct
+  end
+
+  test "Get nounce" do
+    # {:ok, {0, "x0"}} = WEB3.Client.get_nonce(@contract_address)
+    {:error, "Error retrieving nonce."} = WEB3.Client.get_nonce(@contract_address)
   end
 end