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Automatic retry with exponential backoff #58

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Automatic retry with exponential backoff #58

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9fdc66a
Retry with Exponential backoff
Alan-M-Thomaz Mar 28, 2019
ad2e977
Update to FCM URLs for device groups features
Alan-M-Thomaz Mar 28, 2019
f99a4c3
fix tests to use FCM device group URL
Alan-M-Thomaz Mar 29, 2019
3607446
fix,refactor and added tests for retry
Alan-M-Thomaz Mar 29, 2019
46079de
cover all retryable errors
Alan-M-Thomaz Mar 29, 2019
f86baf6
removing Faraday raise_error middleware.
Alan-M-Thomaz Apr 1, 2019
a8742e0
fix syntax in specs for ruby version 2.1 or lower
Alan-M-Thomaz Apr 1, 2019
8620262
refactor notification_key related methods
Alan-M-Thomaz Apr 15, 2019
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37 changes: 26 additions & 11 deletions lib/fcm.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -8,7 +8,6 @@ class FCM
FORMAT = :json

# constants
GROUP_NOTIFICATION_BASE_URI = 'https://android.googleapis.com'
INSTANCE_ID_API = 'https://iid.googleapis.com'
TOPIC_REGEX = /[a-zA-Z0-9\-_.~%]+/

Expand All @@ -34,6 +33,7 @@ def initialize(api_key, client_options = {})
def send_notification(registration_ids, options = {})
post_body = build_post_body(registration_ids, options)


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👇here why not just using execute_notifications(post_body) instead

for_uri(BASE_URI) do |connection|
response = connection.post('/fcm/send', post_body.to_json)
build_response(response, registration_ids)
Expand All @@ -49,8 +49,8 @@ def create_notification_key(key_name, project_id, registration_ids = [])
'project_id' => project_id
}

for_uri(GROUP_NOTIFICATION_BASE_URI, extra_headers) do |connection|
response = connection.post('/gcm/notification', post_body.to_json)
for_uri(BASE_URI, extra_headers) do |connection|
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@Alan-M-Thomaz

since there are four places where we need to call /fcm/notification

  • create_notification_key(post)
  • add_registration_ids(post)
  • remove_registration_ids(post)
  • recover_notification_key(get)

maybe it would be better if we refactor this api call into a separate private method, like what execute_notification method does..

def update_group_messaging_setting(body)
  for_uri(BASE_URI, extra_headers) do |connection|
      response = connection.post('/fcm/notification', body.to_json)
      build_response(response)
  end
end

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done, except for recover_notification_key, because it's a get request

response = connection.post('/fcm/notification', post_body.to_json)
build_response(response)
end
end
Expand All @@ -65,8 +65,8 @@ def add_registration_ids(key_name, project_id, notification_key, registration_id
'project_id' => project_id
}

for_uri(GROUP_NOTIFICATION_BASE_URI, extra_headers) do |connection|
response = connection.post('/gcm/notification', post_body.to_json)
for_uri(BASE_URI, extra_headers) do |connection|
response = connection.post('/fcm/notification', post_body.to_json)
build_response(response)
end
end
Expand All @@ -81,8 +81,8 @@ def remove_registration_ids(key_name, project_id, notification_key, registration
'project_id' => project_id
}

for_uri(GROUP_NOTIFICATION_BASE_URI, extra_headers) do |connection|
response = connection.post('/gcm/notification', post_body.to_json)
for_uri(BASE_URI, extra_headers) do |connection|
response = connection.post('/fcm/notification', post_body.to_json)
build_response(response)
end
end
Expand All @@ -94,13 +94,13 @@ def recover_notification_key(key_name, project_id)
notification_key_name: key_name
}
}

extra_headers = {
'project_id' => project_id
}

for_uri(GROUP_NOTIFICATION_BASE_URI, extra_headers) do |connection|
response = connection.get('/gcm/notification', params)
for_uri(BASE_URI, extra_headers) do |connection|
response = connection.get('/fcm/notification', params)
build_response(response)
end
end
Expand Down Expand Up @@ -144,7 +144,7 @@ def get_instance_id_info iid_token, options={}
params = {
query: options
}

for_uri(INSTANCE_ID_API) do |connection|
response = connection.get('/iid/info/'+iid_token, params)
build_response(response)
Expand Down Expand Up @@ -177,7 +177,22 @@ def send_to_topic_condition(condition, options = {})
private

def for_uri(uri, extra_headers = {})
retry_if_func = lambda do |env, exception|
retryable_errors = [
"Unavailable", "InternalServerError",
"DeviceMessageRateExceeded", "TopicsMessageRateExceeded"]
if defined?(exception.response) && defined?(exception.response.status) && exception.response.status == 200
body = JSON.parse(exception.response.body)
body["results"] != nil && body["results"].any? { |result| retryable_errors.include? result["error"]}
else
true
end
end
retryable_exceptions = Faraday::Request::Retry::DEFAULT_EXCEPTIONS
connection = ::Faraday.new(:url => uri) do |faraday|
faraday.request :retry, max: 5, interval: 0.1, interval_randomness: 0.5, backoff_factor: 2,
exceptions: retryable_exceptions, retry_statuses: [200, *(500..599)], methods: [],
retry_if: retry_if_func
faraday.adapter Faraday.default_adapter
faraday.headers["Content-Type"] = "application/json"
faraday.headers["Authorization"] = "key=#{api_key}"
Expand Down
58 changes: 51 additions & 7 deletions spec/fcm_spec.rb
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Original file line number Diff line number Diff line change
Expand Up @@ -2,7 +2,7 @@

describe FCM do
let(:send_url) { "#{FCM::BASE_URI}/fcm/send" }
let(:group_notification_base_uri) { "#{FCM::GROUP_NOTIFICATION_BASE_URI}/gcm/notification" }
let(:group_notification_base_uri) { "#{FCM::BASE_URI}/fcm/notification" }
let(:api_key) { 'AIzaSyB-1uEai2WiUapxCs2Q0GZYzPu7Udno5aA' }
let(:registration_id) { '42' }
let(:registration_ids) { ['42'] }
Expand Down Expand Up @@ -90,7 +90,7 @@
stub_request(:post, send_url)
.with(body: '{"registration_ids":["42"],"data":{"score":"5x1","time":"15:10"}}',
headers: valid_request_headers)
.to_return(status: 200, body: '', headers: {})
.to_return(status: 200, body: '{}', headers: {})
end
before do
end
Expand All @@ -106,13 +106,13 @@
stub_request(:post, send_url)
.with(body: '{"to":"/topics/TopicA","data":{"score":"5x1","time":"15:10"}}',
headers: valid_request_headers)
.to_return(status: 200, body: '', headers: {})
.to_return(status: 200, body: '{}', headers: {})
end
let!(:stub_with_invalid_topic) do
stub_request(:post, send_url)
.with(body: '{"condition":"/topics/TopicA$","data":{"score":"5x1","time":"15:10"}}',
headers: valid_request_headers)
.to_return(status: 200, body: '', headers: {})
.to_return(status: 200, body: '{}', headers: {})
end

describe "#send_to_topic" do
Expand All @@ -135,19 +135,19 @@
stub_request(:post, send_url)
.with(body: '{"condition":"\'TopicA\' in topics && (\'TopicB\' in topics || \'TopicC\' in topics)","data":{"score":"5x1","time":"15:10"}}',
headers: valid_request_headers)
.to_return(status: 200, body: '', headers: {})
.to_return(status: 200, body: '{}', headers: {})
end
let!(:stub_with_invalid_condition) do
stub_request(:post, send_url)
.with(body: '{"condition":"\'TopicA\' in topics and some other text (\'TopicB\' in topics || \'TopicC\' in topics)","data":{"score":"5x1","time":"15:10"}}',
headers: valid_request_headers)
.to_return(status: 200, body: '', headers: {})
.to_return(status: 200, body: '{}', headers: {})
end
let!(:stub_with_invalid_condition_topic) do
stub_request(:post, send_url)
.with(body: '{"condition":"\'TopicA$\' in topics","data":{"score":"5x1","time":"15:10"}}',
headers: valid_request_headers)
.to_return(status: 200, body: '', headers: {})
.to_return(status: 200, body: '{}', headers: {})
end

describe "#send_to_topic_condition" do
Expand Down Expand Up @@ -338,6 +338,50 @@
)
end
end

context 'when send_notification responds with 5XX or 200+error:unavailable' do
subject { FCM.new(api_key) }

let(:valid_response_body) do
{
failure: 0, canonical_ids: 0, results: [{ message_id: '0:1385025861956342%572c22801bb3' }]
}
end

let(:error_response_body) do
{
failure: 1, canonical_ids: 0, results: [{ error: 'Unavailable' }]
}
end


let(:stub_fcm_send_request_unavaible_server) do
i = 0
stub_request(:post, send_url).with(
body: "{\"registration_ids\":[\"42\"]}",
headers: {
'Accept'=>'*/*',
'Accept-Encoding'=>'gzip;q=1.0,deflate;q=0.6,identity;q=0.3',
'User-Agent'=>'Faraday v0.15.4'
}).to_return do |stub|
body = {}
status = ( i == 0) ? 501 : 200
body = error_response_body if i == 1
body = valid_response_body if i == 0
i += 1
{status: status, headers: { :"Retry-After" => "1"}, body: body.to_json}
end
end

before(:each) do
stub_fcm_send_request_unavaible_server
end

it 'should retry 2 times' do
subject.send( registration_ids)
stub_fcm_send_request_unavaible_server.should have_been_made.times(3)
end
end
end

describe 'sending group notifications' do
Expand Down