Add benchmark for snowplow requests

Author: Shubham Gupta

Diff for: .gitignore

@@ -24,3 +24,5 @@ snowplow_elixir_tracker-*.tar
 
 # Ignore elixir tables created using PersistentEts
 *.tab
+# Ignore benchee output files
+benchmarks/*

Diff for: config/config.exs

@@ -32,6 +32,6 @@ use Mix.Config
 config :snowplow_tracker,
   default_options: [
     timeout: 5000,
-    recv_timeout: 2000
-  ],
-  table: :snowplow_events
+    recv_timeout: 2000,
+    hackney: [pool: :snowplow_hackney_pool]
+  ]

Diff for: mix.exs

@@ -38,6 +38,8 @@ defmodule SnowplowTracker.MixProject do
       {:uuid, "~> 1.1"},
       {:persistent_ets, "~> 0.2.1"},
       {:ex_doc, "~> 0.11", only: :dev},
+      {:benchee, "~> 1.0", only: :dev},
+      {:benchee_html, "~> 1.0", only: :dev},
       {:mock, "~> 0.3.0", only: :test},
       {:excoveralls, "~> 0.8", only: :test}
     ]

Diff for: mix.lock

@@ -1,5 +1,8 @@
 %{
+  "benchee": {:hex, :benchee, "1.0.1", "66b211f9bfd84bd97e6d1beaddf8fc2312aaabe192f776e8931cb0c16f53a521", [:mix], [{:deep_merge, "~> 1.0", [hex: :deep_merge, repo: "hexpm", optional: false]}], "hexpm"}, "benchee_html": {:hex, :benchee_html, "1.0.0", "5b4d24effebd060f466fb460ec06576e7b34a00fc26b234fe4f12c4f05c95947", [:mix], [{:benchee, ">= 0.99.0 and < 2.0.0", [hex: :benchee, repo: "hexpm", optional: false]}, {:benchee_json, "~> 1.0", [hex: :benchee_json, repo: "hexpm", optional: false]}], "hexpm"},
+  "benchee_json": {:hex, :benchee_json, "1.0.0", "cc661f4454d5995c08fe10dd1f2f72f229c8f0fb1c96f6b327a8c8fc96a91fe5", [:mix], [{:benchee, ">= 0.99.0 and < 2.0.0", [hex: :benchee, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm"},
   "certifi": {:hex, :certifi, "2.5.1", "867ce347f7c7d78563450a18a6a28a8090331e77fa02380b4a21962a65d36ee5", [:rebar3], [{:parse_trans, "~>3.3", [hex: :parse_trans, repo: "hexpm", optional: false]}], "hexpm"},
+  "deep_merge": {:hex, :deep_merge, "1.0.0", "b4aa1a0d1acac393bdf38b2291af38cb1d4a52806cf7a4906f718e1feb5ee961", [:mix], [], "hexpm"},
   "earmark": {:hex, :earmark, "1.3.2", "b840562ea3d67795ffbb5bd88940b1bed0ed9fa32834915125ea7d02e35888a5", [:mix], [], "hexpm"},
   "ex_doc": {:hex, :ex_doc, "0.20.2", "1bd0dfb0304bade58beb77f20f21ee3558cc3c753743ae0ddbb0fd7ba2912331", [:mix], [{:earmark, "~> 1.3", [hex: :earmark, repo: "hexpm", optional: false]}, {:makeup_elixir, "~> 0.10", [hex: :makeup_elixir, repo: "hexpm", optional: false]}], "hexpm"},
   "excoveralls": {:hex, :excoveralls, "0.11.1", "dd677fbdd49114fdbdbf445540ec735808250d56b011077798316505064edb2c", [:mix], [{:hackney, "~> 1.0", [hex: :hackney, repo: "hexpm", optional: false]}, {:jason, "~> 1.0", [hex: :jason, repo: "hexpm", optional: false]}], "hexpm"},

Diff for: test/snowplow_tracker_benchmark.exs

@@ -0,0 +1,24 @@
+alias SnowplowTracker
+alias SnowplowTracker.Events.Structured
+alias SnowplowTracker.{Tracker, Emitter}
+
+:hackney_pool.child_spec(:snowplow_hackney_pool, timeout: 60_000, max_connections: 500)
+emitter = %Emitter{collector_uri: "locahost", protocol: "http", request_type: "GET" }
+tracker = %Tracker{emitter: emitter}
+payload = Structured.new(%{category: "test", action: "test", value: 0.0})
+
+
+tracker_func = fn _ -> SnowplowTracker.track_struct_event(payload, tracker) end
+Benchee.run(
+  %{
+    "structured event" => fn -> (1..100000) |>  Enum.each(tracker_func) end
+  },
+  formatters: [
+    Benchee.Formatters.HTML,
+    Benchee.Formatters.Console
+  ],
+  time: 15,
+  warmup: 5,
+  parallel: 12
+)
+