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http proxy with Elixir. wait request with multi port and forward to each URIs

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KazuCocoa/http_proxy

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Elixir CI

codecov

Simple multi HTTP Proxy using Plug. And support record/play requests.

MY GOAL

  • Record/Play proxied requests
    • http_proxy support multi port and multi urls on one execution commandmix proxy.
  • Support VCR

architecture

           http_proxyClient  (server  client)  proxied_server  |            |            |  | 1.request  |            |  |  ------>   | 2.request  |  |            |  ------>   |  |            |            |  |            | 3.response |  | 4.response |  <------   |  |  <------   |            |  |            |            |
  1. The client sends a request to http_proxy, then the http_proxy works as a proxy server.
  2. When the http_proxy receives the request from the client, then the http_proxy sends the request to a proxied server, e.g.http://google.com, as a client.
  3. The http_proxy receives responses from the proxied_server, then the http_proxy sets the response into its response to the client.
  4. The Client receives responses from the http_proxy.

Quick use as http proxy

requirement

  • Elixir over 1.7

set application and deps

  • mix.exs
    • :logger is option.
    • :http_proxy is not need if you run http_proxy withHttpProxy.start/0 orHttpProxy.stop/0 manually.
defapplicationdo[applications:[:logger,:http_proxy]]end...defpdepsdo[{:http_proxy,"~> 1.4.0"}]end

set configuration

  • config/config.exs
use Mix.Configconfig :http_proxy,  proxies: [             %{port: 8080,               to:   "http://google.com"},             %{port: 8081,               to:   "http://yahoo.com"}            ]
  • To manage logger, you should define logger settings like the following.
config :logger, :console,  level: :info

solve deps and run a server

$ mix deps.get$ mix clean$ mix run --no-halt # start proxy server

If you would like to start production mode, you should run withMIX_ENV=prod like the following command.

$ MIX_ENV=prod mix run --no-halt

launch browser

Launch browser and openhttp://localhost:8080 orhttp://localhost:8081.Then,http://localhost:8080 redirect tohttp://google.com andhttp://localhost:8081 do tohttp://yahoo.com.

Development

  • Copypre-commit hook
    • cp hooks/pre-commit ./git/hooks/pre-commit

Configuration

Customize proxy port

  • You can customize a proxy port. For example, if you change a waiting port from8080 to4000, then you can access tohttp://google.com viahttp://localhost:4000.
use Mix.Configconfig :http_proxy,  proxies: [             %{port: 4000,               to:   "http://google.com"},             %{port: 8081,               to:   "http://yahoo.com"}            ]

Add proxy

  • You can add a waiting ports in configuration file. For example, the following setting allow you to access tohttp://apple.com viahttp://localhost:8082 in addition.
use Mix.Configconfig :http_proxy,  proxies: [             %{port: 8080,               to:   "http://google.com"},             %{port: 8081,               to:   "http://yahoo.com"},             %{port: 8082,               to:   "http://apple.com"}            ]

Play and Record mode

  • When:record and:play arefalse, then the http_proxy works just multi port proxy.
  • When:record istrue, then the http_proxy works to record request which is proxied.
  • When:play istrue, then the http_proxy works to play request between this the http_proxy and clients.
useMix.Configconfig:http_proxy,proxies:[# MUST%{port:8080,# proxy all request even play or recordto:"http://google.com"},%{port:8081,to:"http://yahoo.com"}]timeout:20_000,# Option, ms to wait http request.record:false,# Option, true: record requests. false: don't record.play:false,# Option, true: play stored requests. false: don't play.export_path:"test/example",# Option, path to export recorded files.play_path:"test/data"# Option, path to read json files as response to.

Example

Record request as the following

{"request": {"headers": [],"method":"GET","options": {"aspect":"query_params"    },"remote":"127.0.0.1","request_body":"","url":"http://localhost:8080/hoge/inu?email=neko&pass=123"  },"response": {"body_file":"path/to/body_file.json","cookies": {},"headers": {"Cache-Control":"public, max-age=2592000","Content-Length":"251","Content-Type":"text/html; charset=UTF-8","Date":"Sat, 21 Nov 2015 00:37:38 GMT","Expires":"Mon, 21 Dec 2015 00:37:38 GMT","Location":"http://www.google.com/hoge/inu?email=neko&pass=123","Server":"sffe","X-Content-Type-Options":"nosniff","X-XSS-Protection":"1; mode=block"    },"status_code":301  }}

Response body will save in "path/to/body_file.json".

Play request with the following JSON data

  • Example ishttps://github.com/KazuCocoa/http_proxy/tree/master/test/data/mappings
  • You can setpath orpath_pattern as attribute underrequest.
    • Ifpath, the http_proxy check requests are matched completely.
    • Ifpath_pattern, the http_proxy check requests are matched with Regex.
  • You can setbody orbody_file as attribute underresponse.
    • Ifbody, the http_proxy send the body string.
    • Ifbody_file, the http_proxy send the body_file binary as response.

path andbody case

{"request": {"path":"/request/path","port":8080,"method":"GET"  },"response": {"body":"<html>hello world</html>","cookies": {},"headers": {"Content-Type":"text/html; charset=UTF-8","Server":"GFE/2.0"    },"status_code":200  }}

path_pattern andbody_file case

  • Pattern match withRegex.match?(Regex.compile!("\A/request.*neko\z"), request_path)
  • File.read/2 viafile/to/path.json and respond the binary
{"request": {"path_pattern":"\A/request.*neko\z","port":8080,"method":"GET"  },"response": {"body_file":"file/to/path.json","cookies": {},"headers": {"Content-Type":"text/html; charset=UTF-8","Server":"GFE/2.0"    },"status_code":200  }}

dependencies

$ mix xref graphlib/http_proxy.ex└── lib/http_proxy/supervisor.ex    ├── lib/http_proxy/agent.ex    │   ├── lib/http_proxy/play/data.ex    │   │   ├── lib/http_proxy/agent.ex    │   │   └── lib/http_proxy/play/response.ex    │   │       ├── lib/http_proxy/play/data.ex    │   │       └── lib/http_proxy/utils/file.ex    │   └── lib/http_proxy/play/paths.ex    │       ├── lib/http_proxy/agent.ex    │       └── lib/http_proxy/play/response.ex    └── lib/http_proxy/handle.ex        ├── lib/http_proxy/play/body.ex        ├── lib/http_proxy/play/data.ex        ├── lib/http_proxy/play/paths.ex        ├── lib/http_proxy/play/response.ex        └── lib/http_proxy/record/response.ex            ├── lib/http_proxy/format.ex            │   └── lib/http_proxy/data.ex (compile)            └── lib/http_proxy/utils/file.ex

TODO

styleguide

http://elixir.community/styleguide

LICENSE

MIT. Please read LICENSE.

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