Class: LambdaPunch::Api

Inherits:
Object
  • Object
show all
Includes:
Singleton
Defined in:
lib/lambda_punch/api.rb

Overview

Interface to Lambda’s Extensions API using simple ‘Net::HTTP` calls.

Lambda Extensions API
https://docs.aws.amazon.com/lambda/latest/dg/runtimes-extensions-api.html

Constant Summary collapse

EXTENSION_NAME = 
'lambdapunch'

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.loop ⇒ Object 



19
20
21
 
# File 'lib/lambda_punch/api.rb', line 19

def loop
  instance.loop
end

.register! ⇒ Object 



15
16
17
 
# File 'lib/lambda_punch/api.rb', line 15

def register!
  instance.register!
end

Instance Method Details

#loop ⇒ Object 



41
42
43
44
45
46
47
48
49
50
 
# File 'lib/lambda_punch/api.rb', line 41

def loop
  resp = event_next
  event_payload = JSON.parse(resp.body)
  case event_payload['eventType']
  when 'INVOKE'   then invoke(event_payload)
  when 'SHUTDOWN' then shutdown
  else
    event_type_error(event_payload)
  end
end

#register! ⇒ Object 



25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
 
# File 'lib/lambda_punch/api.rb', line 25

def register!
  return if @registered
  uri = URI.parse "#{base_uri}/register"
  http = Net::HTTP.new uri.host, uri.port
  request = Net::HTTP::Post.new uri.request_uri
  request['Content-Type'] = 'application/vnd.aws.lambda.extension+json'
  request['Lambda-Extension-Name'] = EXTENSION_NAME
  request.body = %q|{"events":["INVOKE","SHUTDOWN"]}|
  http.request(request).tap do |r|
    logger.debug "Api#register! => #{r.class.name.inspect}, body: #{r.body}"
    @registered = true
    @extension_id = r.each_header.to_h['lambda-extension-identifier']
    logger.debug "Api::ExtensionId => #{@extension_id}"
  end
end