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Introduction to Webmachine

Jade Allen
October 16, 2013
Technology
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120

Introduction to Webmachine

Webmachine is a toolkit to build REST APIs implemented in Erlang.

Jade Allen

October 16, 2013
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Transcript

  1. Introduction to Webmachine! ! ! Mark Allen! [email protected]! @bytemeorg! http://byte-me.org!

    https://github.com/mrallen1!

  2. HTTP is complicated!

  3. None

  4. Abstraction!

  5. Toolkit!

  6. A gentle introduction! to Erlang!

  7. Sincerely flattered!

  8. dj-webmachine! (python)!

  9. webmachine.rb! (ruby)!

  10. webmachine.js! (node)!

  11. liberator! (clojure)!

  12. scalamachine! (scala)!

  13. Framework!

  14. Framework!

  15. None

  16. Hello World! Resource!

  17. -module(hello_world_resource). -export([init/1, to_html/2]). -include_lib("webmachine/include/webmachine.hrl"). init([]) -> {ok, "Hello, world"}. to_html(Req,

    State) -> {io_lib:format("<html><head><title>~s</title></ head><body>~s</body></html>", [State, State]), Req, State}.

  18. -module(hello_world_resource). -export([init/1, to_html/2]). -include_lib("webmachine/include/webmachine.hrl"). init([]) -> {ok, "Hello, world"}. to_html(Req,

    State) -> {io_lib:format("<html><head><title>~s</title></ head><body>~s</body></html>", [State, State]), Req, State}.

  19. -module(hello_world_resource). -export([init/1, to_html/2]). -include_lib("webmachine/include/webmachine.hrl"). init([]) -> {ok, "Hello, world"}. to_html(Req,

    State) -> {io_lib:format("<html><head><title>~s</title></ head><body>~s</body></html>", [State, State]), Req, State}.

  20. Conditional GET!

  21. -module(hello_world_resource). -export([init/1, to_html/2, generate_etag/2]). -include_lib("webmachine/include/webmachine.hrl"). init([]) -> {ok, "Hello, world"}.

    to_html(Req, State) -> {io_lib:format("<html><head><title>~s</title></ head><body>~s</body></html>", [State, State]), Req, State}. generate_etag(Req, State) -> {mochihex:to_hex(crypto:md5(State)), Req, State}.

  22. Encoding Support!

  23. -module(hello_world_resource). -export([init/1, to_html/2, generate_etag/2]). -export([encodings_provided/2]). -include_lib("webmachine/include/webmachine.hrl"). init([]) -> {ok, "Hello,

    world"}. to_html(Req, State) -> {io_lib:format("<html><head><title>~s</title></ head><body>~s</body></html>", [State, State]), Req, State}. generate_etag(Req, State) -> {mochihex:to_hex(crypto:md5(State)), Req, State}. encodings_provided(Req, State) -> {[{"gzip", fun(X) -> zlib:gzip(X) end}], Req, State}.
  24. None

  25. Content Negotiation!

  26. -module(hello_world_resource). -export([init/1, to_html/2, to_json/2, generate_etag/2]). -export([encodings_provided/2, content_types_provided/2]). -include_lib("webmachine/include/webmachine.hrl"). init([]) ->

    {ok, "Hello, world"}. content_types_provided(Req, State) -> {[{"text/html", to_html}, {"application/json", to_json}], Req, State}. to_json(Req, State) -> {mochijson2:encode({struct, [{greeting, list_to_binary(State)}]}), Req, State}. to_html(Req, State) -> {io_lib:format("<html><head><title>~s</title></ head><body>~s</body></html>", [State, State]), Req, State}. %% ...
  27. None

  28. Resource! Implementation! Pattern!

  29. f(Req, State) -> {RetVal, Req, State}.

  30. Manipulating! Requests or Responses!

  31. wrq:get_req_header(HeaderName, Req) -> 'undefined' | HeaderValue

  32. wrq:set_resp_header( HeaderName, HeaderValue, Req) -> NewReq.

  33. to_json(Req, State) -> {mochijson2:encode({struct, [{greeting, list_to_binary(State)}]} ), wrq:set_resp_header( "Content-Type", "application/json",

    Req), State}.
  34. None

  35. Visual Debugging!

  36. None

  37. curl -v -Haccept:application/xml 127.0.0.1:8000

  38. Basic URL Dispatch!

  39. {["a"], some_resource, []}

  40. {["a"], some_resource, []}

  41. {["a"], some_resource, []}

  42. Fancy URL Dispatch!

  43. % The atom '*' is a wildcard {["a", '*'], some_resource,

    []} % matches /a/b/c or /a/b/c/d

  44. % bind 2nd element to 'foo' {["a", foo], some_resource, []}

    % retrieve with % wrq:path_info(foo, Req) % URL of /a/b returns "b"

  45. % bind 2nd element to 'foo' {["a", foo], some_resource, []}

    % /a/b/c/d => 404 Not Found

  46. % dispatch /a/b/c/d {["a", foo, '*'], some_resource, []}

  47. Handling POST!

  48. •  allowed_methods/2 •  post_is_create/2 •  create_path/2 •  content_types_accepted/2 •  handler

    functions!

  49. Other cool stuff:! •  Streaming requests/ responses! •  File uploads!

  50. Resources:! •  https://github.com/basho/webmachine! •  https://github.com/mrallen1/wm_hello! •  https://speakerdeck.com/mrallen1/ intro_to_webmachine!

  51. Thank you!! ! Questions?!