From cf586771b628aea022b88b2c6d3e201338b80faf Mon Sep 17 00:00:00 2001
From: elijah <elijah@riseup.net>
Date: Wed, 11 Mar 2015 15:29:43 -0700
Subject: Better error message when a database is missing (very useful for
 nagios tests)

---
 app/controllers/application_controller.rb | 20 +++++++++++++++-----
 test/integration/api/login_test.rb        |  2 +-
 2 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/app/controllers/application_controller.rb b/app/controllers/application_controller.rb
index a4560e2..ff291f2 100644
--- a/app/controllers/application_controller.rb
+++ b/app/controllers/application_controller.rb
@@ -4,23 +4,33 @@ class ApplicationController < ActionController::Base
   before_filter :no_cache_header
   before_filter :no_frame_header
   before_filter :language_header
+  rescue_from StandardError, :with => :default_error_handler
+  rescue_from RestClient::Exception, :with => :default_error_handler
 
   ActiveSupport.run_load_hooks(:application_controller, self)
 
   protected
 
-  rescue_from StandardError do |e|
+  def default_error_handler(exc)
     respond_to do |format|
-      format.json { render_json_error(e) }
-      format.all  { raise e }  # reraise the exception so the normal thing happens.
+      format.json { render_json_error(exc) }
+      format.all  { raise exc }  # reraise the exception so the normal thing happens.
     end
   end
 
+  #
+  # I think this should be 'errors', not 'error', since that is what
+  # `respond_with @object` will return. For now, I am leaving this as 'error',
+  # since there is some code that depends on this.
+  #
   def render_json_error(e)
     Rails.logger.error e
     Rails.logger.error e.backtrace.join("\n")
-    render status: 500,
-      json: {error: "The server failed to process your request. We'll look into it."}
+    if e.is_a?(CouchRest::StorageMissing)
+      render status: 500, json: {error: "The database '#{e.db}' does not exist!"}
+    else
+      render status: 500, json: {error: "The server failed to process your request. We'll look into it (#{e.class})."}
+    end
   end
 
   ##
diff --git a/test/integration/api/login_test.rb b/test/integration/api/login_test.rb
index f37639e..22047bc 100644
--- a/test/integration/api/login_test.rb
+++ b/test/integration/api/login_test.rb
@@ -14,9 +14,9 @@ class LoginTest < SrpTest
 
   test "login with srp" do
     authenticate
+    assert_nil server_auth["error"]
     assert_equal ["M2", "id", "token"], server_auth.keys
     assert last_response.successful?
-    assert_nil server_auth["errors"]
     assert server_auth["M2"]
   end
 
-- 
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