remove UUID dependency

lib/sentry/event.ex

@@ -176,7 +176,7 @@ defmodule Sentry.Event do
 
   @spec add_metadata(Event.t()) :: Event.t()
   def add_metadata(%Event{} = state) do
-    %{state | event_id: UUID.uuid4(:hex), timestamp: Util.iso8601_timestamp()}
+    %{state | event_id: Util.uuid4_hex(), timestamp: Util.iso8601_timestamp()}
     |> Map.update(:server_name, nil, fn server_name ->
       server_name || to_string(:net_adm.localhost())
     end)

lib/sentry/util.ex

@@ -3,6 +3,9 @@ defmodule Sentry.Util do
     Provides basic utility functions.
   """
 
+  @rfc_4122_variant10 2
+  @uuid_v4_identifier 4
+
   @doc """
     Generates a unix timestamp
   """
@@ -33,4 +36,16 @@ defmodule Sentry.Util do
   end
 
   def mix_deps_to_map(modules), do: modules
+
+  @doc """
+  Per http://www.ietf.org/rfc/rfc4122.txt
+  """
+  @spec uuid4_hex() :: String.t()
+  def uuid4_hex() do
+    <<time_low_mid::48, _version::4, time_high::12, _reserved::2, rest::62>> =
+      :crypto.strong_rand_bytes(16)
+
+    <<time_low_mid::48, @uuid_v4_identifier::4, time_high::12, @rfc_4122_variant10::2, rest::62>>
+    |> Base.encode16(case: :lower)
+  end
 end

mix.exs

@@ -18,14 +18,13 @@ defmodule Sentry.Mixfile do
   def application do
     [
       mod: {Sentry, []},
-      applications: [:hackney, :elixir_uuid, :poison, :logger]
+      applications: [:hackney, :poison, :logger]
     ]
   end
 
   defp deps do
     [
       {:hackney, "~> 1.8 or 1.6.5"},
-      {:elixir_uuid, "~> 1.2"},
       {:poison, "~> 1.5 or ~> 2.0 or ~> 3.0"},
       {:plug, "~> 1.6", optional: true},
       {:phoenix, "~> 1.3", optional: true},

mix.lock

@@ -7,7 +7,6 @@
   "credo": {:hex, :credo, "0.9.3", "76fa3e9e497ab282e0cf64b98a624aa11da702854c52c82db1bf24e54ab7c97a", [:mix], [{:bunt, "~> 0.2.0", [hex: :bunt, repo: "hexpm", optional: false]}, {:poison, ">= 0.0.0", [hex: :poison, repo: "hexpm", optional: false]}], "hexpm"},
   "dialyxir": {:hex, :dialyxir, "0.5.1", "b331b091720fd93e878137add264bac4f644e1ddae07a70bf7062c7862c4b952", [:mix], [], "hexpm"},
   "earmark": {:hex, :earmark, "1.2.4", "99b637c62a4d65a20a9fb674b8cffb8baa771c04605a80c911c4418c69b75439", [:mix], [], "hexpm"},
-  "elixir_uuid": {:hex, :elixir_uuid, "1.2.0", "ff26e938f95830b1db152cb6e594d711c10c02c6391236900ddd070a6b01271d", [:mix], [], "hexpm"},
   "ex_doc": {:hex, :ex_doc, "0.18.3", "f4b0e4a2ec6f333dccf761838a4b253d75e11f714b85ae271c9ae361367897b7", [:mix], [{:earmark, "~> 1.1", [hex: :earmark, repo: "hexpm", optional: false]}], "hexpm"},
   "hackney": {:hex, :hackney, "1.12.1", "8bf2d0e11e722e533903fe126e14d6e7e94d9b7983ced595b75f532e04b7fdc7", [:rebar3], [{:certifi, "2.3.1", [hex: :certifi, repo: "hexpm", optional: false]}, {:idna, "5.1.1", [hex: :idna, repo: "hexpm", optional: false]}, {:metrics, "1.0.1", [hex: :metrics, repo: "hexpm", optional: false]}, {:mimerl, "1.0.2", [hex: :mimerl, repo: "hexpm", optional: false]}, {:ssl_verify_fun, "1.1.1", [hex: :ssl_verify_fun, repo: "hexpm", optional: false]}], "hexpm"},
   "idna": {:hex, :idna, "5.1.1", "cbc3b2fa1645113267cc59c760bafa64b2ea0334635ef06dbac8801e42f7279c", [:rebar3], [{:unicode_util_compat, "0.3.1", [hex: :unicode_util_compat, repo: "hexpm", optional: false]}], "hexpm"},

test/event_test.exs

@@ -466,8 +466,7 @@ defmodule Sentry.EventTest do
              poison: "3.1.0",
              ranch: "1.3.2",
              ssl_verify_fun: "1.1.1",
-             unicode_util_compat: "0.3.1",
-             elixir_uuid: "1.2.0"
+             unicode_util_compat: "0.3.1"
            }
   end
 end