Class: Flipper::Adapters::FirebaseRemoteConfig::Client

Inherits:
Object
  • Object
show all
Defined in:
lib/flipper/adapters/firebase_remote_config/client.rb

Overview

Thin REST wrapper around the Firebase Remote Config v1 API.

Why hand-rolled instead of a generated client: there is no published service gem for ‘firebaseremoteconfig_v1` — neither bundled inside the (deprecated) `google-api-client` umbrella, nor as a stand-alone `google-apis-firebaseremoteconfig_v1`. We use `googleauth` directly for the OAuth2 service-account flow, and Net::HTTP for the two endpoints we actually need.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(project_id:, credentials: nil, http: nil) ⇒ Client

Returns a new instance of Client.



28
29
30
31
32
 
# File 'lib/flipper/adapters/firebase_remote_config/client.rb', line 28

def initialize(project_id:, credentials: nil, http: nil)
  @project_id  = project_id
  @credentials = build_credentials(credentials)
  @http        = http # injection seam for tests
end

Instance Attribute Details

#project_id ⇒ Object (readonly)

Returns the value of attribute project_id.



26
27
28
 
# File 'lib/flipper/adapters/firebase_remote_config/client.rb', line 26

def project_id
  @project_id
end

Instance Method Details

#fetch_template ⇒ Object

Returns [template_hash, etag_string]. The template is the parsed JSON body as a Hash; etag is the opaque string from the ETag response header, which the server demands back on the next write.



37
38
39
40
41
 
# File 'lib/flipper/adapters/firebase_remote_config/client.rb', line 37

def fetch_template
  response = request(:get, template_path)
  ensure_success!(response)
  [JSON.parse(response.body), response['ETag']]
end

#publish_template(template, etag) ⇒ Object

Publishes a modified template. Raises ETagMismatch on 409/412 so the adapter can reload and retry; raises Error on any other failure.

Raises:



45
46
47
48
49
50
51
52
53
54
55
56
57
 
# File 'lib/flipper/adapters/firebase_remote_config/client.rb', line 45

def publish_template(template, etag)
  response = request(
    :put,
    template_path,
    body: JSON.generate(template),
    headers: { 'Content-Type' => 'application/json; UTF-8',
               'If-Match' => etag || '*' }
  )
  raise ETagMismatch, response.body if etag_conflict?(response)

  ensure_success!(response)
  response
end