1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
|
module ActionController #:nodoc:
# Actions that fail to perform as expected throw exceptions. These exceptions can either be rescued for the public view
# (with a nice user-friendly explanation) or for the developers view (with tons of debugging information). The developers view
# is already implemented by the Action Controller, but the public view should be tailored to your specific application. So too
# could the decision on whether something is a public or a developer request.
#
# You can tailor the rescuing behavior and appearance by overwriting the following two stub methods.
module Rescue
def self.append_features(base) #:nodoc:
super
base.extend(ClassMethods)
base.class_eval do
alias_method :perform_action_without_rescue, :perform_action
alias_method :perform_action, :perform_action_with_rescue
end
end
module ClassMethods #:nodoc:
def process_with_exception(request, response, exception)
new.process(request, response, :rescue_action, exception)
end
end
protected
# Exception handler called when the performance of an action raises an exception.
def rescue_action(exception)
log_error(exception) if logger
erase_results if performed?
if consider_all_requests_local || local_request?
rescue_action_locally(exception)
else
rescue_action_in_public(exception)
end
end
# Overwrite to implement custom logging of errors. By default logs as fatal.
def log_error(exception) #:doc:
if ActionView::TemplateError === exception
logger.fatal(exception.to_s)
else
logger.fatal(
"\n\n#{exception.class} (#{exception.message}):\n " +
clean_backtrace(exception).join("\n ") +
"\n\n"
)
end
end
# Overwrite to implement public exception handling (for requests answering false to <tt>local_request?</tt>).
def rescue_action_in_public(exception) #:doc:
case exception
when RoutingError, UnknownAction then
render_text(IO.read(File.join(RAILS_ROOT, 'public', '404.html')), "404 Not Found")
else render_text "<html><body><h1>Application error (Rails)</h1></body></html>"
end
end
# Overwrite to expand the meaning of a local request in order to show local rescues on other occurences than
# the remote IP being 127.0.0.1. For example, this could include the IP of the developer machine when debugging
# remotely.
def local_request? #:doc:
@request.remote_addr == "127.0.0.1"
end
# Renders a detailed diagnostics screen on action exceptions.
def rescue_action_locally(exception)
add_variables_to_assigns
@template.instance_variable_set("@exception", exception)
@template.instance_variable_set("@rescues_path", File.dirname(__FILE__) + "/templates/rescues/")
@template.send(:assign_variables_from_controller)
@template.instance_variable_set("@contents", @template.render_file(template_path_for_local_rescue(exception), false))
@headers["Content-Type"] = "text/html"
render_file(rescues_path("layout"), response_code_for_rescue(exception))
end
private
def perform_action_with_rescue #:nodoc:
begin
perform_action_without_rescue
rescue Object => exception
if defined?(Breakpoint) && @params["BP-RETRY"]
msg = exception.backtrace.first
if md = /^(.+?):(\d+)(?::in `(.+)')?$/.match(msg) then
origin_file, origin_line = md[1], md[2].to_i
set_trace_func(lambda do |type, file, line, method, context, klass|
if file == origin_file and line == origin_line then
set_trace_func(nil)
@params["BP-RETRY"] = false
callstack = caller
callstack.slice!(0) if callstack.first["rescue.rb"]
file, line, method = *callstack.first.match(/^(.+?):(\d+)(?::in `(.*?)')?/).captures
message = "Exception at #{file}:#{line}#{" in `#{method}'" if method}." # `� ( for ruby-mode)
Breakpoint.handle_breakpoint(context, message, file, line)
end
end)
retry
end
end
rescue_action(exception)
end
end
def rescues_path(template_name)
File.dirname(__FILE__) + "/templates/rescues/#{template_name}.rhtml"
end
def template_path_for_local_rescue(exception)
rescues_path(
case exception
when MissingTemplate then "missing_template"
when RoutingError then "routing_error"
when UnknownAction then "unknown_action"
when ActionView::TemplateError then "template_error"
else "diagnostics"
end
)
end
def response_code_for_rescue(exception)
case exception
when UnknownAction, RoutingError then "404 Page Not Found"
else "500 Internal Error"
end
end
def clean_backtrace(exception)
exception.backtrace.collect { |line| Object.const_defined?(:RAILS_ROOT) ? line.gsub(RAILS_ROOT, "") : line }
end
end
end
|
