blob: 92730de09c71fdde6a7ac3daf6e32b374cf8be7a (
plain) (
blame)
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
|
module ActionCable
module Channel
class Base
include Callbacks
include PeriodicTimers
include Streams
on_subscribe :connect
on_unsubscribe :disconnect
attr_reader :params, :connection
delegate :logger, to: :connection
def initialize(connection, channel_identifier, params = {})
@connection = connection
@channel_identifier = channel_identifier
@params = params
perform_connection
end
def perform_connection
logger.info "#{channel_name} connecting"
run_subscribe_callbacks
end
def perform_action(data)
if authorized?
action = extract_action(data)
if performable_action?(action)
logger.info action_signature(action, data)
public_send action, data
else
logger.error "Unable to process #{action_signature(action, data)}"
end
else
unauthorized
end
end
def perform_disconnection
run_unsubscribe_callbacks
logger.info "#{channel_name} disconnected"
end
protected
# Override in subclasses
def authorized?
true
end
def unauthorized
logger.error "#{channel_name}: Unauthorized access"
end
def connect
# Override in subclasses
end
def disconnect
# Override in subclasses
end
def transmit(data, via: nil)
if authorized?
logger.info "#{channel_name} transmitting #{data.inspect}".tap { |m| m << " (via #{via})" if via }
connection.transmit({ identifier: @channel_identifier, message: data }.to_json)
else
unauthorized
end
end
def channel_name
self.class.name
end
private
def extract_action(data)
(data['action'].presence || :receive).to_sym
end
def performable_action?(action)
self.class.instance_methods(false).include?(action)
end
def action_signature(action, data)
"#{channel_name}##{action}".tap do |signature|
if (arguments = data.except('action')).any?
signature << "(#{arguments.inspect})"
end
end
end
def run_subscribe_callbacks
self.class.on_subscribe_callbacks.each { |callback| send(callback) }
end
def run_unsubscribe_callbacks
self.class.on_unsubscribe_callbacks.each { |callback| send(callback) }
end
end
end
end
|
