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Working with HTTP in Ruby: Tips, Tricks, and Te...
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Andrey Deryabin
November 23, 2017
Technology
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Working with HTTP in Ruby: Tips, Tricks, and Techniques.
Slides from "Fall Saint P Ruby Meetup" meetup (23.11.2017)
Andrey Deryabin
November 23, 2017
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Transcript
HTTP in Ruby: Tips, Tricks and Techniques Andrey Deryabin
Andrey Deryabin
None
None
EVIL MARTIANS
EVIL MARTIANS
Промедление смерти подобно
HTTP Hypertext Transfer Protocol
History – HTTP/1.1 (v1) - 1999 (RFCs 2616, 7230, 7231,
7232, 7233, 7234 and 7235) – HTTP/2.0 -2015 (RFC 7540)
HTTP 1.1 – most popular protocol in WEB – a
stateless – request => response
HTTP/2 – Binary framing parsing and encoding – Query multiplexing
– Headers Compression – Connection and stream management – And more and more
curl -v https: //google.com > GET / HTTP/1.1 > Host:
google.com > User-Agent: curl/7.51.0 > Accept: */* > < HTTP/1.1 302 Found < Cache-Control: private < Content-Type: text/html; charset=UTF-8 < Location: https: // www.google.es/?gfe_rd=cr&dcr=0&ei=XIINWr2XIuis8wfFipPwDQ < Content-Length: 269 < <HTML><HEAD><meta http-equiv="content-type" content="text/html;charset=utf-8"> <TITLE>302 Moved </TITLE> </HEAD><BODY> <H1>302 Moved </H1> The document has moved <A HREF="https: // www.google.es/? gfe_rd=cr&dcr=0&ei=XIINWr2XIuis8wfFipPwDQ">here </A>. </BODY> </HTML> Method Resource Protocol Request Response Body Headers
What is about ?
How many Ruby HTTP clients do you know?
Ruby HTTP Clients Net::HTTP RestClient Faraday Ethcon Curb Typhoeus HTTP.rb
HTTPClient HTTParty Patron EM-HTTP-Request Excon
Identical
Ruby HTTP Clients – Support GET/POST/PUT/DELETE methods – Follow redirect
– Proxy – HTTP Auth – Compression – etc
What are the differences?
Engine?
Ruby HTTP Clients Faraday Ethcon Curb Typhoeus Patron Libcurl EM-HTTP-Request
Excon Event machine HTTParty Net::HTTP RestClient HTTP.rb HTTPClient TCPSocket Net::HTTP
DSL?
What else?
Feature (Bugs)!!!
Net::HTTP # request uri = URI.parse('http: //localhost:4567/json') http = Net
::HTTP.new(uri.host, uri.port) request = Net ::HTTP ::Post.new(uri.request_uri, 'Content-Type' => 'text/json') request.body = { ‘first_name' => 'Leo', ‘last_name' => 'Messi' }.to_json http.request(request) # response [201, { "Сontent-length" => "7", 'Connection' => "Barca" }, "Created"]
Net::HTTP { "content-type" =>"text/html;charset=utf-8", "connection" =>"Barca, close", "x-xss-protection" =>"1; mode=block",
"x-content-type-options" =>"nosniff", "x-frame-options" =>"SAMEORIGIN", "content-length" =>"7" } WHAT?
Net::HTTP # [201, { "Сontent-length" => "7", 'Connection' => "Barca"
}, "Created"] { "content-type" =>"text/html;charset=utf-8", "connection" =>"Barca, close", "x-xss-protection" =>"1; mode=block", "x-content-type-options" =>"nosniff", "x-frame-options" =>"SAMEORIGIN", "content-length" =>"7" } WHAT?
RFC 2616 - "Hypertext Transfer Protocol -- HTTP/1.1", Section 4.2,
"Message Headers" Each header field consists of a name followed by a colon (":") and the field value. Field names are case- insensitive
HTTPClient Documented? NO!
Typhoeus Typhoeus ::Request.new('localhost:4567/?lang=ruby&author=matz', method: :get).run
Typhoeus # request headers {"User-Agent" =>"Typhoeus - https: //github.com/typhoeus/typhoeus”} WHAT?
Typhoeus Default User-Agent?
Typhoeus
Typhoeus
Fail story 1
Groupon
# Simplifed ERB <%= Ipgeobase.lookup(current_ip).city %>
# https: //github.com/mokevnin/ipgeobase/blob/master/lib/ipgeobase.rb require 'uri' require 'open-uri' module Ipgeobase URL
= 'http: //ipgeobase.ru:7020/geo' autoload 'IpMetaData', 'ipgeobase/ip_meta_data' def self.lookup(ip, params = {}) uri = URI.parse(URL) uri.query = URI.encode_ www_form :ip => ip resp = open(uri, params).read() IpMetaData.parse(resp.to_s) end end
Use timeouts
Fail story 2
Useless box
TopSecretProjectMlApi ::AdaptiveFeed .perform({id:"15234", date: “2017-11-23"})
What is it? API call? What JSON do you send?
Epic thinking face
Control HTTP traffic
Command line tools
Tcpdump
GUI applications
Charles (Web debug proxy application)
Does it developer friendly?
puts "no"
Requirements – Log all requests – Analyse requests – Understand
what is under the hood
gem install sniffer
Sniffer supports most popular HTTP clients: Net::HTTP HTTP HTTPClient Patron
Curb Ethan Typhoeus
Disabled by default
Sniffer.enable!
Easy configuration
Sniffer.config do logger: Logger.new($stdout), severity: Logger ::Severity ::DEBUG, # HTTP
options to log log: { request_url: true, request_headers: true, request_body: true, request_method: true, response_status: true, response_headers: true, response_body: true, timing: true }, store: true, # save requests/responses to Sniffer.data enabled: false # Sniffer disabled by default end
Time to play
pry(main)> Sniffer.enable!; pry(main)> client = Elasticsearch ::Client.new; pry(main)> client.search q:
'Saint P Ruby'; D, [2017-11-21T21:13:25.120892 #87793] DEBUG -- : {"port": 9200,"host":"localhost","query":"/_search? q=Saint+P+Ruby","rq_content_type":"application/ json","rq_user_agent":"Faraday v0.9.2","rq_accept_encoding":"gzip;q=1.0,deflate;q=0.6,identity;q=0 .3","rq_accept":"*/ *","rq_connection":"close","method":"GET","request_body":"","status ":200,"rs_content_type":"application/json; charset=UTF-8","rs_content_length":"124","timing": 0.49408299988135695,"response_body":"{\"took\": 224,\"timed_out\":false,\"_shards\":{\"total\":5,\"successful\": 5,\"failed\":0},\"hits\":{\"total\":0,\"max_score\":null,\"hits\": []}}"} Example
{ "port":9200, "host":"localhost", "query":"/_search?q=Saint+P+Ruby", "rq_content_type":"application/json", "rq_user_agent":"Faraday v0.9.2", "rq_accept_encoding":"gzip;q=1.0,deflate;q=0.6,identity;q=0.3", "rq_accept":"*/*", "rq_connection":"close",
"method":"GET", "request_body":"", "status":200, "rs_content_type":"application/json; charset=UTF-8", "rs_content_length":"124", "timing":0.49408299988135695, "response_body":"{\"took\":224,\"timed_out\":false,\"_shards\":{\"total\": 5,\"successful\":5,\"failed\":0},\"hits\":{\"total\":0,\"max_score\":null, \"hits\":[]}}" } Logging
Sniffer.data.first.request => #<Sniffer ::DataItem ::Request:0x00007fbe880cd700 @body="", @headers= {"content-type" =>"application/json", "user-agent"
=>"Faraday v0.11.0", "accept- encoding" =>"gzip;q=1.0,deflate;q=0.6,identity;q=0.3", "accept" =>"*/*", "connection" =>"close"}, @host="localhost", @method="GET", @port=9200, @query="/_search?q=Saint+P+Ruby"> Analyze request
Sniffer.data.first.request.headers => {"content-type" =>"application/json", "user-agent" =>"Faraday v0.9.2", "accept-encoding" =>"gzip;q=1.0,deflate;q=0.6,identity;q=0.3", "accept"
=>"*/*", “connection" =>"close"} Sniffer.data.first.request.method => "GET" Analyze request
Sniffer.data.first.response => #<Sniffer ::DataItem ::Response:0x00007fbe86078658 @body= "{\"took\":989,\"timed_out\":false,\"_shards\":{\"total\": 5,\"successful\":5,\"failed\":0},\"hits\":{\"total\": 0,\"max_score\":null,\"hits\":[]}}", @headers=
{"content-type" =>"application/json; charset=UTF-8", "content-length" =>"124"}, @status=200, @timing=1.6817439999431372> Analyze response
Sniffer.data.first.response.body => “{\"took\":224,\"timed_out\":false,\"_shards\":{\"total\": 5,\"successful\":5,\"failed\":0},\"hits\":{\"total\": 0,\"max_score\":null,\"hits\":[]}}" Sniffer.data.first.response.headers => {"content-type" =>"application/json; charset=UTF-8",
“content- length" =>"124"} Sniffer.data.first.response.timing => 0.49408299988135695 Analyze response
Log Management
require 'elasticsearch' require 'sniffer' Sniffer.config.logger = Logger.new('sniffer.log') Sniffer.enable! client =
Elasticsearch ::Client.new; client.cluster.health client.search q: 'Saint P Ruby'; sudo remote_syslog -p 300 \n -d logs.papertrailapp.com \n sniffer.log
None
require 'elasticsearch' require 'sniffer' require 'le' Sniffer.config.logger = Le.new('<token>') Sniffer.enable!
client = Elasticsearch ::Client.new; client.cluster.health client.search q: 'Saint P Ruby';
None
Resume
Read a source code
Write open source
Use Sniffer!
None
Thanks! aderyabin @aderyabin @evilmartians evilmartians.com
[email protected]