build faraday-based connection class for making http request

Author: Roy-Mao

lib/fcm/connection.rb

@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+require 'faraday'
+require 'faraday/retry'
+require 'faraday/typhoeus'
+
+module Fcm
+  # underhood http client using faraday with typhoeus adapter
+  module Connection
+    DEFAULT_TIMEOUT = 30
+
+    def make_request(method, base_uri, end_point, body, headers)
+      url = "#{base_uri}#{end_point}"
+      agent.send(method, url, body, headers)
+    end
+
+    private
+
+    def agent
+      @agent ||= Faraday.new(
+        request: { timeout: DEFAULT_TIMEOUT }
+      ) do |builder|
+        builder.request :retry, exceptions: [
+          Faraday::TimeoutError, Faraday::ConnectionFailed
+        ]
+        builder.request :json
+        builder.response :json
+        builder.adapter :typhoeus
+      end
+    end
+  end
+end