Fix compiler warnings

.gitignore

@@ -11,3 +11,6 @@ doc
 
 .elixir_ls
 cover
+
+# Dialyzer's Persistent Lookup Table
+priv/plts/

README.md

@@ -10,15 +10,15 @@ KafkaEx
 [![API Docs](https://img.shields.io/badge/api-docs-yellow.svg?style=flat)](http://hexdocs.pm/kafka_ex/)
 
 KafkaEx is an Elixir client for [Apache Kafka](http://kafka.apache.org/) with
-support for Kafka versions 0.8.0 and newer.  KafkaEx requires Elixir 1.5+ and
+support for Kafka versions 0.8.0 and newer. KafkaEx requires Elixir 1.6+ and
 Erlang OTP 19+.
 
 See [http://hexdocs.pm/kafka_ex/](http://hexdocs.pm/kafka_ex/) for
 documentation,
  [https://github.com/kafkaex/kafka_ex/](https://github.com/kafkaex/kafka_ex/)
  for code.
 
-KakfaEx supports the following Kafka features:
+KafkaEx supports the following Kafka features:
 
 *   Broker and Topic Metadata
 *   Produce Messages

lib/kafka_ex/consumer_group.ex

@@ -297,11 +297,9 @@ defmodule KafkaEx.ConsumerGroup do
   def active?(supervisor_pid, timeout \\ 5000) do
     consumer_supervisor = consumer_supervisor_pid(supervisor_pid, timeout)
 
-    if consumer_supervisor && Process.alive?(consumer_supervisor) do
+    consumer_supervisor &&
+      Process.alive?(consumer_supervisor) &&
       GenConsumer.Supervisor.active?(consumer_supervisor)
-    else
-      false
-    end
   end
 
   @doc """
@@ -334,9 +332,17 @@ defmodule KafkaEx.ConsumerGroup do
         opts
       ) do
     child =
-      supervisor(
-        KafkaEx.GenConsumer.Supervisor,
-        [{gen_consumer_module, consumer_module}, group_name, assignments, opts],
+      Supervisor.child_spec(
+        {
+          KafkaEx.GenConsumer.Supervisor,
+          %{
+            gen_consumer_module: gen_consumer_module,
+            consumer_module: consumer_module,
+            group_name: group_name,
+            assignments: assignments,
+            opts: opts
+          }
+        },
         id: :consumer
       )
 
@@ -363,10 +369,8 @@ defmodule KafkaEx.ConsumerGroup do
     opts = Keyword.put(opts, :supervisor_pid, self())
 
     children = [
-      worker(
-        KafkaEx.ConsumerGroup.Manager,
-        [{gen_consumer_module, consumer_module}, group_name, topics, opts]
-      )
+      {KafkaEx.ConsumerGroup.Manager,
+       {{gen_consumer_module, consumer_module}, group_name, topics, opts}}
     ]
 
     Supervisor.init(children,

lib/kafka_ex/consumer_group/manager.ex

@@ -53,18 +53,18 @@ defmodule KafkaEx.ConsumerGroup.Manager do
 
   @doc false
   # use `KafkaEx.ConsumerGroup.start_link/4` instead
-  @spec start_link(
+  @spec start_link({
           {module, module},
           binary,
           [binary],
           KafkaEx.GenConsumer.options()
-        ) :: GenServer.on_start()
-  def start_link(
+        }) :: GenServer.on_start()
+  def start_link({
         {gen_consumer_module, consumer_module},
         group_name,
         topics,
-        opts \\ []
-      ) do
+        opts
+      }) do
     gen_server_opts = Keyword.get(opts, :gen_server_opts, [])
     consumer_opts = Keyword.drop(opts, [:gen_server_opts])
 

lib/kafka_ex/gen_consumer/supervisor.ex

@@ -15,15 +15,23 @@ defmodule KafkaEx.GenConsumer.Supervisor do
 
   use DynamicSupervisor
 
+  if Version.match?(System.version(), ">= 1.7.0") do
+    @doc since: "0.14.0"
+  end
+
   @doc """
   Starts a `GenConsumer.Supervisor` process linked to the current process.
 
   `gen_consumer_module` is a module that implements the `GenServer` behaviour
   which consumes events from Kafka.
+
   `consumer_module` is a module that implements the `GenConsumer` behaviour.
-  `group_name` is the name of a consumer group, and `assignments` is a list of
-  partitions for the `GenConsumer`s to consume.  `opts` accepts the same
-  options as `KafkaEx.GenConsumer.start_link/5`.
+
+  `group_name` is the name of a consumer group.
+
+  `assignments` is a list of partitions for the `GenConsumer`s to consume.
+
+  `opts` accepts the same options as `KafkaEx.GenConsumer.start_link/5`.
 
   ### Return Values
 
@@ -32,20 +40,22 @@ defmodule KafkaEx.GenConsumer.Supervisor do
   If the supervisor and its consumers are successfully created, this function
   returns `{:ok, pid}`, where `pid` is the PID of the supervisor.
   """
-  @spec start_link(
-          {gen_consumer_module :: module, consumer_module :: module},
-          consumer_group_name :: binary,
-          assigned_partitions :: [
+  @spec start_link(%{
+          gen_consumer_module: module,
+          consumer_module: module,
+          group_name: binary,
+          assignments: [
             {topic_name :: binary, partition_id :: non_neg_integer}
           ],
-          KafkaEx.GenConsumer.options()
-        ) :: Elixir.Supervisor.on_start()
-  def start_link(
-        {gen_consumer_module, consumer_module},
-        group_name,
-        assignments,
-        opts \\ []
-      ) do
+          opts: KafkaEx.GenConsumer.options()
+        }) :: Supervisor.on_start()
+  def start_link(%{
+        gen_consumer_module: gen_consumer_module,
+        consumer_module: consumer_module,
+        group_name: group_name,
+        assignments: assignments,
+        opts: opts
+      }) do
     start_link_result =
       DynamicSupervisor.start_link(
         __MODULE__,
@@ -71,6 +81,39 @@ defmodule KafkaEx.GenConsumer.Supervisor do
     end
   end
 
+  @deprecated "Use start_link/1 instead"
+  @doc """
+  Starts a `GenConsumer.Supervisor` process linked to the current process.
+
+  Refer to `start_link/1` for documentation of each parameter.
+
+  ### Return Values
+
+  Same as `start_link/1`.
+  """
+  @spec start_link(
+          {gen_consumer_module :: module, consumer_module :: module},
+          consumer_group_name :: binary,
+          assigned_partitions :: [
+            {topic_name :: binary, partition_id :: non_neg_integer}
+          ],
+          KafkaEx.GenConsumer.options()
+        ) :: Elixir.Supervisor.on_start()
+  def start_link(
+        {gen_consumer_module, consumer_module},
+        group_name,
+        assignments,
+        opts \\ []
+      ) do
+    start_link(%{
+      gen_consumer_module: gen_consumer_module,
+      consumer_module: consumer_module,
+      group_name: group_name,
+      assignments: assignments,
+      opts: opts
+    })
+  end
+
   @doc """
   Returns a list of child pids