Adds the HttpError exception - Fixes #792

lib/common/db_updater.rb

@@ -36,8 +36,7 @@ class DbUpdater
     url = "#{remote_file_url(filename)}.sha512"
 
     res = Browser.get(url, request_params)
-    additional_text = res.code == 0 ? res.return_message : "return code #{res.code}"
-    fail "Unable to get #{url} (#{additional_text})" unless res.code == 200
+    fail DownloadError, res unless res.code == 200
     res.body
   end
 
@@ -73,8 +72,7 @@ class DbUpdater
     file_url  = remote_file_url(filename)
 
     res = Browser.get(file_url, request_params)
-    additional_text = res.code == 0 ? res.return_message : "return code #{res.code}"
-    fail "Error while downloading #{file_url} (#{additional_text})" unless res.code == 200
+    fail DownloadError, res unless res.code == 200
     File.open(file_path, 'wb') { |f| f.write(res.body) }
 
     local_file_checksum(filename)

lib/common/errors.rb

@@ -0,0 +1,27 @@
+
+# HTTP Error
+class HttpError < StandardError
+  attr_reader :response
+
+  # @param [ Typhoeus::Response ] res
+  def initialize(response)
+    @response = response
+  end
+
+  def failure_details
+    msg = response.effective_url
+    msg += response.code == 0 ? " (#{response.return_message})" : " (status: #{response.code})"
+    msg
+  end
+
+  def message
+    "HTTP Error: #{failure_details}"
+  end
+end
+
+# Used in the Updater
+class DownloadError < HttpError
+  def message
+    "Unable to get #{failure_details}"
+  end
+end