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Building web-API without Rails, registration or sms
Andrey Savchenko
November 20, 2015
Programming
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Building web-API without Rails, registration or sms
Pivorak meetup #6, Lviv
Andrey Savchenko
November 20, 2015
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Transcript
None
About me Andriy Savchenko /ptico CTO Aejis andriy@aejis.eu
RubyMeditation
W A R N I N G THIS TALK CONTAINS
LOTS OF CODE THIS IS YOUR LAST CHANCE TO LEAVE AUDITORY
Problems with rails
• Low latency • Dependency hell • MVC is only
suitable for simple CRUD • ActiveSupport
Other frameworks
• grape • sinatra • rum • nyny
And…
Rack
run ->(env) { [ 200, # <= Response code {'Content-Type'
=> 'application/json'}, # <= Headers [ '{"a": 1}' ] # <= Body ] }
require 'json' run ->(env) { [ 200, {'Content-Type' => 'application/json'},
[ JSON.dump({ a: 1 }) ] # <= Almost API ;) ] }
Add some OOP
run ->(env) { [ 200, # <= Response code {'Content-Type'
=> 'application/json'}, # <= Headers [ '{"a": 1}' ] # <= Body ] }
class Responder def response_code 200 end def headers {'Content-Type' =>
'application/json'} end def body [ JSON.dump({ a: 1 }) ] end end
class Responder def response_code @code end def headers @headers end
def body [ JSON.dump(@body) ] end end
class Example < Responder def initialize(env) @code = 200 @headers
= {'Content-Type' => 'application/json'} @body = { a: 1 } end end
class ReadUsers < Responder def initialize(env) @code = 200 @headers
= {'Content-Type' => 'application/json'} @body = DB[:users].all end end
run ->(env) { result = ReadUsers.new(env) [result.response_code, result.headers, result.body] }
result = ReadUsers.new(env) r = Nginx::Request.new result.headers.each_pair { |k, v|
r.headers_out[k] = v } Nginx.rputs result.body[0] Nginx.return result.response_code
Less generic example
Good API • Proper status codes • Compatibility (?suppress_response_code=true) •
Metadata
class Responder class << self def call(env) req = ::Rack::Request.new(env)
instance = new(req) instance.call instance.to_rack_array end end attr_reader :request, :params, :headers def initialize(req) @request = req @params = req.params @headers = default_response_headers end def call; end def to_rack_array [http_response_code, http_response_headers, http_response_body] end end
class Responder def response_code @response_code || default_response_code end private def
default_response_code 200 end def http_response_code params['suppress_response_codes'] ? 200 : response_code end end
class Responder def default_response_headers { 'Content-Type' => 'application/json' }.dup end
def http_response_headers @headers end end
class Responder def body @body end private def http_response_body [
JSON.dump(body) ] end end
class ReadUsers < Responder def call @body = DB[:users].all end
end
class Read < Responder def call @body = fetch end
end
class ReadUsers < Read def fetch DB[:users].all end end
class Write < Responder def call @body = valid_params? ?
success : failure end private def success; end def failure; end def valid_params? true end end
class CreateUser < Write def default_response_code 201 end def valid_params?
params['login'] && params['email'] end def success DB[:users].insert(params) end def failure @response_code = 400 { error: 'Invalid params' } end end
class Responder def body { code: http_response_code, result: @body, meta:
meta } end def meta { server_time: Time.now.to_i } end end
{ "code": 200, "result": [ { "id": 1, "name": "Andriy
Savchenko", "email": "andriy@aejis.eu", "company": "Aejis", "hiring": true } ], "meta": { "server_time": 1447939835 } }
Awesome!
Routers • Rack::Builder • http_router (gh:joshbuddy/http_router) • lotus-router (gh:lotus/router) •
signpost (gh:Ptico/signpost) • journey (dead)
Advantages
Faster $ ruby -v ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-darwin15]
$ puma -e production $ ab -n 10000 -c 100 http://0.0.0.0:9292/users/ |======================|====Rails-API====|=====Sinatra=====|=====Rack API====| |Time taken for tests: | 13.262 seconds | 6.858 seconds | 3.665 seconds | |Complete requests: | 10000 | 10000 | 10000 | |Failed requests: | 0 | 0 | 0 | |Requests per second: | 754.03 [#/sec] | 1458.20 [#/sec] | 2728.28 [#/sec] | |Time per request: | 132.620 [ms] | 68.578 [ms] | 36.653 [ms] | |Time per request (c): | 1.326 [ms] | 0.686 [ms] | 0.367 [ms] | |Transfer rate: | 301.91 [KB/sec] | 262.02 [KB/sec] | 402.31 [KB/sec] | |============================================================================|
Faster • 4x faster then rails-api & 2x then sinatra
• Ready for further improvements
Magic-less • Base responder takes ≈ 65LOC • The only
dependency is Rack (optional)
Maintainable • Stable object interface • Each responder can have
its own file structure • SOLID • Test-friendly
Questions? Credits and attributions: • Title illustration by Max Bohdanowski
• Lobster Two font by Pablo Impallari & Igino Marini (OFL) • Font Awesome by Dave Gandy - http://fontawesome.io (OFL) • https://www.flickr.com/photos/mattsh/14194586111/ (CC BY-NC-SA 2.0) Andriy Savchenko /ptico andriy@aejis.eu