finished block_time

lib/block/validation/local/block_time.ex

+defmodule Block.Validation.Local.BlockTime do
+  require Logger
+
+  # @default_avg_gen_time 16 * 60
+  # @pow_difficulty_range_ratio 1.189
+  # @median_time_blocks 20
+  def valid(block) do
+    time = block["time"]
+    median_time = block["medianTime"]
+
+    cond do
+      block["number"] > 0 and (time < median_time or time > median_time + max_acceleration()) ->
+        Logger.error(
+          "A block must have its Time between MedianTime and MedianTime" <>
+            to_string(max_acceleration())
+        )
+
+        false
+
+      block["number"] == 0 and time != median_time ->
+        Logger.error("Root block must have Time equal to MedianTime")
+        false
+
+      true ->
+        true
+    end
+  end
+
+  defp max_acceleration() do
+    max_gen_time = Float.ceil(Constants.Contract.avgGenTime() * Constants.powDifficultyRangeRatio())
+    Float.ceil(max_gen_time * Constants.Contract.medianTimeBlocks())
+  end
+end

lib/dunixir/constants.ex

@@ -12,6 +12,8 @@ defmodule Constants do
   def sigReplay, do: 10
   def nbDigitsUD, do: 4
 
+  def powDifficultyRangeRatio, do: 1.189
+
 
 
   def head_v0_regexp, do: "^WS2P:HEAD:(" <> pubkey_regexp() <> "):(" <> block_uid_regexp() <> ")$"
@@ -111,7 +113,7 @@ defmodule Constants do
       "([0-9A-Fa-f]{1,4}::([0-9A-Fa-f]{1,4}:){0,5}[0-9A-Fa-f]{1,4})|" <>
       "(::([0-9A-Fa-f]{1,4}:){0,6}[0-9A-Fa-f]{1,4})|(([0-9A-Fa-f]{1,4}:){1,7}:))$"
   end
-  
+
 end
 
 defmodule Constants.Contract do

test/block/validation/local/block_time_test.exs

+defmodule Block.Validation.Local.BlockTimeTest do
+  use ExUnit.Case
+  doctest Block.Validation.Local.BlockTime
+
+  @first_block %{
+    "version" => 10,
+    "nonce" => 100_000_000_001,
+    "number" => 0,
+    "powMin" => 0,
+    "time" => 1_489_672_122,
+    "medianTime" => 1_489_672_122,
+    "membersCount" => 2,
+    "monetaryMass" => nil,
+    "unitBase" => 0,
+    "issuersCount" => 0,
+    "issuersFrame" => 1,
+    "issuersFrameVar" => 0,
+    "len" => 6,
+    "currency" => "duniter_unit_test_currency",
+    "issuer" => "DNann1Lh55eZMEDXeYt59bzHbA3NJR46DeQYCS2qQdLV",
+    "signature" =>
+      "N+x0F9pUcFTeqU3KEvmjGaPjnWt2uWkWCO43VXsBYCLCrjKkwU0EqJouETQKeQ7t7ukOiOyIrXW7+JBbzXaIBQ==",
+    "hash" => "D06BB9FEE8D9E59892283D96A6B4D7B3937A177FB1F2B435A60E949099837355",
+    "parameters" =>
+      "0.007376575:3600:1200:0:40:604800:31536000:1:604800:604800:0.9:31536000:3:20:960:10:0.6666666666666666:1489675722:1489675722:3600",
+    "previousHash" => nil,
+    "previousIssuer" => nil,
+    "inner_hash" => "C7DED079D6093B6E1210061D7EB43C7F006C6F656EF35A4F60E80B7B3CCBD989",
+    "dividend" => nil,
+    "identities" => [
+      "DNann1Lh55eZMEDXeYt59bzHbA3NJR46DeQYCS2qQdLV:1eubHHbuNfilHMM0G2bI30iZzebQ2cQ1PC7uPAw08FGMMmQCRerlF/3pc4sAcsnexsxBseA/3lY03KlONqJBAg==:0-E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855:tic",
+      "DKpQPUL4ckzXYdnDRvCRKAm1gNvSdmAXnTrJZ7LvM5Qo:lcekuS0eP2dpFL99imJcwvDAwx49diiDMkG8Lj7FLkC/6IJ0tgNjUzCIZgMGi7bL5tODRiWi9B49UMXb8b3MAw==:0-E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855:toc"
+    ],
+    "joiners" => ["DNann1Lh55eZMEDXeYt59bzHbA3NJR46DeQYCS2qQdLV:s2hUbokkibTAWGEwErw6hyXSWlWFQ2UWs2PWx8d/kkElAyuuWaQq4Tsonuweh1xn4AC1TVWt4yMR3WrDdkhnAw==:0-E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855:0-E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855:tic",
+    "DKpQPUL4ckzXYdnDRvCRKAm1gNvSdmAXnTrJZ7LvM5Qo:80pUx9YBk0RwqrVrQQA+PuxoNn21A8NwQ3824CQPU1ad9R1oDXc/pU6NVpQv92LM8gaWs/Pm1mLXNNVnr+m6BA==:0-E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855:0-E3B0C44298FC1C149AFBF4C8996FB92427AE41E4649B934CA495991B7852B855:toc"
+  ],
+  "actives" => [],
+  "leavers" => [],
+  "revoked" => [],
+  "excluded" => [],
+  "certifications" => [
+    "DKpQPUL4ckzXYdnDRvCRKAm1gNvSdmAXnTrJZ7LvM5Qo:DNann1Lh55eZMEDXeYt59bzHbA3NJR46DeQYCS2qQdLV:0:vMaYgBSnU+83AYOVQCZAx1XLpg/F1MmMztDfCnZvl8hPs4LE9tcDvCrrFogAwMEW2N7Y0gCH62/fBMgw4KrGCA==",
+    "DNann1Lh55eZMEDXeYt59bzHbA3NJR46DeQYCS2qQdLV:DKpQPUL4ckzXYdnDRvCRKAm1gNvSdmAXnTrJZ7LvM5Qo:0:RKIGMgYIhB9FmjPbmyo4egPufg/iTpBznYGZp5hjK1WZ1a9imQldLNUMe0eiPlSKJTK/JD3gOlCiynOEY2csBA=="
+  ],
+  "transactions" => []
+}
+
+@random_block %{
+  "version" => 10,
+  "nonce" => 10_200_000_000_544,
+  "number" => 89789,
+  "powMin" => 61,
+  "time" => 1_511_207_700,
+  "medianTime" => 1_511_206_743,
+  "membersCount" => 26,
+  "monetaryMass" => 4_506_796,
+  "unitbase" => 0,
+  "issuersCount" => 5,
+  "issuersFrame" => 26,
+  "issuersFrameVar" => 0,
+  "currency" => "g1-test",
+  "issuer" => "68jjsRrrX6hzs4z6eK2A2MUGLdKPfysFd1n3DYfHr7X9",
+  "signature" =>
+    "bZ0yW/y8JPTuCA0k+pb9LQoWuFACh14QAew79mbOTUsyfdApuCkbFPoOErTPTsvqQdoi+Uf/6nyF6piRbwNVCw==",
+  "hash" => "0000E9BEC445D0A4203568F34CE7B2879C52AB699BB4ED41C0870B0AEE39E5C2",
+  "parameters" => "",
+  "previousHash" => "0001E8442C934B9A90AADD817E98E813F5487D4F6A521411D7959E7FD21E265A",
+  "previousIssuer" => "9Kjpr9VGoMLe3NYUkthPkEoZfxo3pGcs1g9i1H8SPNeL",
+  "inner_hash" => "44D93C4483C749FBAE7954A49F276FCA8FB5141010B1EF7FAF20251A9C5B2DC8",
+  "dividend" => nil,
+  "identities" => [],
+  "joiners" => [],
+  "actives" => [],
+  "leavers" => [],
+  "revoked" => [],
+  "excluded" => [],
+  "certifications" => [],
+  "transactions" => [],
+  "raw" =>
+    "Version: 10\nType: Block\nCurrency: g1-test\nNumber: 89789\nPoWMin: 61\nTime: 1511207700\nMedianTime: 1511206743\nUnitBase: 0\nIssuer: 68jjsRrrX6hzs4z6eK2A2MUGLdKPfysFd1n3DYfHr7X9\nIssuersFrame: 26\nIssuersFrameVar: 0\nDifferentIssuersCount: 5\nPreviousHash: 0001E8442C934B9A90AADD817E98E813F5487D4F6A521411D7959E7FD21E265A\nPreviousIssuer: 9Kjpr9VGoMLe3NYUkthPkEoZfxo3pGcs1g9i1H8SPNeL\nMembersCount: 26\nIdentities:\nJoiners:\nActives:\nLeavers:\nRevoked:\nExcluded:\nCertifications:\nTransactions:\nInnerHash: 44D93C4483C749FBAE7954A49F276FCA8FB5141010B1EF7FAF20251A9C5B2DC8\nNonce: 10200000000544\n"
+}
+
+alias Block.Validation.Local.BlockTime, as: BlockTime
+
+test "Check first block time is correctly validated" do
+  assert BlockTime.valid(@first_block)
+end
+
+test "Check that valid block time is correctly validated" do
+  assert BlockTime.valid(@random_block)
+end
+
+end
+