(#33) Handle Auth class errors

This commit updates the Auth class to properly raise an error when
something goes wrong. It also updates the vmpooler command class to
handle when those errors get raised.

lib/vmfloaty/auth.rb

@@ -1,6 +1,7 @@
 require 'faraday'
 require 'json'
 require 'vmfloaty/http'
+require 'vmfloaty/errors'
 
 class Auth
   def self.get_token(verbose, url, user, password)
@@ -12,15 +13,13 @@ class Auth
     if res_body["ok"]
       return res_body["token"]
     else
-      STDERR.puts "There was a problem with your request:\n#{res_body}"
-      return nil
+      raise TokenError, "HTTP #{resp.status}: There was a problem requesting a token:\n#{res_body}"
     end
   end
 
   def self.delete_token(verbose, url, user, password, token)
     if token.nil?
       STDERR.puts 'You did not provide a token'
-      return nil
     end
 
     conn = Http.get_conn_with_auth(verbose, url, user, password)
@@ -30,15 +29,13 @@ class Auth
     if res_body["ok"]
       return res_body
     else
-      STDERR.puts "There was a problem with your request:\n#{res_body}"
-      return nil
+      raise TokenError, "HTTP #{response.status}: There was a problem deleting a token:\n#{res_body}"
     end
   end
 
   def self.token_status(verbose, url, token)
     if token.nil?
       STDERR.puts 'You did not provide a token'
-      return nil
     end
 
     conn = Http.get_conn(verbose, url)
@@ -49,8 +46,7 @@ class Auth
     if res_body["ok"]
       return res_body
     else
-      STDERR.puts "There was a problem with your request:\n#{res_body}"
-      return nil
+      raise TokenError, "HTTP #{response.status}: There was a problem getting the status of a token:\n#{res_body}"
     end
   end
 end

lib/vmfloaty/errors.rb

@@ -3,3 +3,9 @@ class AuthError < StandardError
     super
   end
 end
+
+class TokenError < StandardError
+  def initialize(msg="Could not do operation with token provided")
+    super
+  end
+end