No OneTemporary
Actions

Size

19 KB

Referenced Files

None

Subscribers

None

View Options

	diff --git a/README.md b/README.md
	index 55bed68..964b97c 100644
	--- a/README.md
	+++ b/README.md
	@@ -1,464 +1,465 @@
	# Tesla

	[![Build Status](https://travis-ci.org/teamon/tesla.svg?branch=master)](https://travis-ci.org/teamon/tesla)
	[![Hex.pm](https://img.shields.io/hexpm/v/tesla.svg)](http://hex.pm/packages/tesla)
	[![Hex.pm](https://img.shields.io/hexpm/dt/tesla.svg)](https://hex.pm/packages/tesla)
	[![Hex.pm](https://img.shields.io/hexpm/dw/tesla.svg)](https://hex.pm/packages/tesla)
	[![Coverage Status](https://coveralls.io/repos/github/teamon/tesla/badge.svg?branch=master)](https://coveralls.io/github/teamon/tesla?branch=master)
	[![Inline docs](http://inch-ci.org/github/teamon/tesla.svg)](http://inch-ci.org/github/teamon/tesla)

	Tesla is an HTTP client loosely based on [Faraday](https://github.com/lostisland/faraday).
	It embraces the concept of middleware when processing the request/response cycle.

	## HTTP Client example

	Define module with `use Tesla` and choose from a variety of middleware.

	```elixir
	defmodule GitHub do
	use Tesla

	plug Tesla.Middleware.BaseUrl, "https://api.github.com"
	plug Tesla.Middleware.Headers, %{"Authorization" => "token xyz"}
	plug Tesla.Middleware.JSON

	def user_repos(login) do
	get("/user/" <> login <> "/repos")
	end
	end
	```

	Then use it like this:

	```elixir
	response = GitHub.user_repos("teamon")
	response.status # => 200
	response.body # => [%{…}, …]
	response.headers # => %{'content-type' => 'application/json'}
	```

	See below for documentation.

	## Installation

	Add `tesla` as dependency in `mix.exs`

	```elixir
	defp deps do
	[{:tesla, "~> 0.8.0"},
	{:poison, ">= 1.0.0"}] # optional, required by JSON middleware
	end
	```

	Also, unless using Elixir `>= 1.4`, add `:tesla` to the `applications` list:

	```ex
	def application do
	[applications: [:tesla, ...], ...]
	end
	```

	## Documentation
	- [Middleware](#middleware)
	- [Runtime middleware](#runtime-middleware)
	- [Adapters](#adapters)
	- [Streaming](#streaming)
	- [Multipart](#multipart)
	- [Testing](#testing)
	- [Writing middleware](#writing-middleware)
	- [Direct usage](#direct-usage)
	- [Cheatsheet](#cheatsheet)


	## Middleware
	Tesla is built around the concept of composable middlewares.
	This is very similar to how [Plug Router](https://github.com/elixir-plug/plug#the-plug-router) works.

	#### Basic
	- [`Tesla.Middleware.BaseUrl`](https://hexdocs.pm/tesla/Tesla.Middleware.BaseUrl.html) - set base url
	- [`Tesla.Middleware.Headers`](https://hexdocs.pm/tesla/Tesla.Middleware.Headers.html) - set request headers
	- [`Tesla.Middleware.Query`](https://hexdocs.pm/tesla/Tesla.Middleware.Query.html) - set query parameters
	- [`Tesla.Middleware.Opts`](https://hexdocs.pm/tesla/Tesla.Middleware.Opts.html) - set request options
	- [`Tesla.Middleware.FollowRedirects`](https://hexdocs.pm/tesla/Tesla.Middleware.FollowRedirects.html) - follow 3xx redirects
	- [`Tesla.Middleware.MethodOverride`](https://hexdocs.pm/tesla/Tesla.Middleware.MethodOverride.html) - set X-Http-Method-Override
	- [`Tesla.Middleware.Logger`](https://hexdocs.pm/tesla/Tesla.Middleware.Logger.html) - log requests (method, url, status, time)
	- [`Tesla.Middleware.DebugLogger`](https://hexdocs.pm/tesla/Tesla.Middleware.DebugLogger.html) - log full requests & responses

	#### Formats
	- [`Tesla.Middleware.FormUrlencoded`](https://hexdocs.pm/tesla/Tesla.Middleware.FormUrlencoded.html) - urlencode POST body parameter, useful for POSTing a map/keyword list
	- [`Tesla.Middleware.JSON`](https://hexdocs.pm/tesla/Tesla.Middleware.JSON.html) - JSON request/response body
	- [`Tesla.Middleware.Compression`](https://hexdocs.pm/tesla/Tesla.Middleware.Compression.html) - gzip & deflate
	- [`Tesla.Middleware.DecodeRels`](https://hexdocs.pm/tesla/Tesla.Middleware.DecodeRels.html) - decode `Link` header into `opts[:rels]` field in response

	#### Auth
	- [`Tesla.Middleware.BasicAuth`](https://hexdocs.pm/tesla/Tesla.Middleware.BasicAuth.html) - HTTP Basic Auth
	- [`Tesla.Middleware.DigestAuth`](https://hexdocs.pm/tesla/Tesla.Middleware.DigestAuth.html) - Digest access authentication

	#### Error handling
	- [`Tesla.Middleware.Timeout`](https://hexdocs.pm/tesla/Tesla.Middleware.Timeout.html) - timeout request after X milliseconds despite of server response
	- [`Tesla.Middleware.Retry`](https://hexdocs.pm/tesla/Tesla.Middleware.Retry.html) - retry few times in case of connection refused
	- [`Tesla.Middleware.Fuse`](https://hexdocs.pm/tesla/Tesla.Middleware.Fuse.html) - fuse circuit breaker integration
	- [`Tesla.Middleware.Tuples`](https://hexdocs.pm/tesla/Tesla.Middleware.Tuples.html) - return `{:ok, env} \| {:error, reason}` instead of raising exception


	## Runtime middleware

	All HTTP functions (`get`, `post`, etc.) can take a dynamic client function as the first parameter.
	This allow to use convenient syntax for modifying the behaviour in runtime.

	Consider the following case: GitHub API can be accessed using OAuth token authorization.

	We can't use `plug Tesla.Middleware.Headers, %{"Authorization" => "token here"}`
	since this would be compiled only once and there is no way to insert dynamic user token.

	Instead, we can use `Tesla.build_client` to create a dynamic middleware function:

	```elixir
	defmodule GitHub do
	# same as above with a slightly change to `user_repos/1`

	def user_repos(client, login) do
	# pass `client` argument to `get` function
	get(client, "/user/" <> login <> "/repos")
	end

	def issues(client \\ %Tesla.Client{}) do
	# default to empty client that will not include runtime token
	get(client, "/issues")
	end

	# build dynamic client based on runtime arguments
	def client(token) do
	Tesla.build_client [
	{Tesla.Middleware.Headers, %{"Authorization" => "token: " <> token }}
	]
	end
	end
	```

	and then:

	```elixir
	client = GitHub.client(user_token)
	client \|> GitHub.user_repos("teamon")
	client \|> GitHub.get("/me")

	GitHub.issues()
	client \|> GitHub.issues()
	```

	The `Tesla.build_client` function can take two arguments: `pre` and `post` middleware.
	The first list (`pre`) will be included before any other middleware. In case there is a need
	to inject middleware at the end you can pass a second list (`post`). It will be put just
	before adapter. In fact, one can even dynamically override the adapter.

	For example, a private (per user) cache could be implemented as:

	```elixir
	def new(user) do
	Tesla.build_client [], [
	fn env, next ->
	case my_private_cache.fetch(user, env) do
	{:ok, env} -> env # return cached response
	:error -> Tesla.run(env, next) # make real request
	end
	end
	end
	end
	```


	## Adapters

	Tesla supports multiple HTTP adapter that do the actual HTTP request processing.

	- [`Tesla.Adapter.Httpc`](https://hexdocs.pm/tesla/Tesla.Adapter.Httpc.html) - the default, built-in erlang [httpc](http://erlang.org/doc/man/httpc.html) adapter
	- [`Tesla.Adapter.Hackney`](https://hexdocs.pm/tesla/Tesla.Adapter.Hackney.html) - [hackney](https://github.com/benoitc/hackney), "simple HTTP client in Erlang"
	- [`Tesla.Adapter.Ibrowse`](https://hexdocs.pm/tesla/Tesla.Adapter.Ibrowse.html) - [ibrowse](https://github.com/cmullaparthi/ibrowse), "Erlang HTTP client"

	When using ibrowse or hackney adapters remember to alter applications list in `mix.exs` (for Elixir < 1.4)

	```elixir
	def application do
	[applications: [:tesla, :ibrowse, ...], ...] # or :hackney
	end
	```

	and add it to the dependency list

	```elixir
	defp deps do
	[{:tesla, "~> 0.7.0"},
	{:ibrowse, "~> 4.2"}, # or :hackney
	{:poison, ">= 1.0.0"}] # for JSON middleware
	end
	```


	## Streaming

	If adapter supports it, you can pass a [Stream](http://elixir-lang.org/docs/stable/elixir/Stream.html) as body, e.g.:

	```elixir
	defmodule ElasticSearch do
	use Tesla

	plug Tesla.Middleware.BaseUrl, "http://localhost:9200"
	plug Tesla.Middleware.JSON

	def index(records_stream) do
	stream = records_stream \|> Stream.map(fn record -> %{index: [some, data]})
	post("/_bulk", stream)
	end
	end
	```

	Each piece of stream will be encoded as JSON and sent as a new line (conforming to JSON stream format)




	## Multipart

	You can pass a `Tesla.Multipart` struct as the body.


	```elixir
	alias Tesla.Multipart

	mp =
	Multipart.new
	\|> Multipart.add_content_type_param("charset=utf-8")
	\|> Multipart.add_field("field1", "foo")
	\|> Multipart.add_field("field2", "bar", headers: [{:"Content-Id", 1}, {:"Content-Type", "text/plain"}])
	\|> Multipart.add_file("test/tesla/multipart_test_file.sh")
	\|> Multipart.add_file("test/tesla/multipart_test_file.sh", name: "foobar")
	+ \|> Multipart.add_file_content("sample file content", "sample.txt")

	response = MyApiClient.post("http://httpbin.org/post", mp)
	```


	## Testing

	You can set the adapter to `:mock` in tests.

	```elixir
	# config/test.exs
	config :tesla, adapter: :mock
	```

	Then, mock requests before using your client:


	```elixir
	defmodule MyAppTest do
	use ExUnit.Case

	setup do
	Tesla.Mock.mock fn
	%{method: :get, url: "http://example.com/hello"} ->
	%Tesla.Env{status: 200, body: "hello"}
	%{method: :post, url: "http://example.com/world"} ->
	%Tesla.Env{status: 200, body: "hi!"}
	end

	:ok
	end

	test "list things" do
	assert %Tesla.Env{} = env = MyApp.get("/hello")
	assert env.status == 200
	assert env.body == "hello"
	end
	end
	```


	## Writing middleware

	A Tesla middleware is a module with `call/3` function, that at some point calls `Tesla.run(env, next)` to process
	the rest of stack.

	```elixir
	defmodule MyMiddleware do
	@behaviour Tesla.Middleware

	def call(env, next, options) do
	env
	\|> do_something_with_request
	\|> Tesla.run(next)
	\|> do_something_with_response
	end
	end
	```

	The arguments are:
	- `env` - `Tesla.Env` instance
	- `next` - middleware continuation stack; to be executed with `Tesla.run(env, next)`
	- `options` - arguments passed during middleware configuration (`plug MyMiddleware, options`)

	There is no distinction between request and response middleware, it's all about executing `Tesla.run/2` function at the correct time.

	For example, a request logger middleware could be implemented like this:

	```elixir
	defmodule Tesla.Middleware.RequestLogger do
	@behaviour Tesla.Middleware

	def call(env, next, _) do
	IO.inspect env # print request env
	Tesla.run(env, next)
	end
	end
	```

	and response logger middleware like this:

	```elixir
	defmodule Tesla.Middleware.ResponseLogger do
	@behaviour Tesla.Middleware

	def call(env, next, _) do
	res = Tesla.run(env, next)
	IO.inspect res # print response env
	res
	end
	end
	```

	See [built-in middlewares](https://github.com/teamon/tesla/tree/master/lib/tesla/middleware) for more examples.

	Middleware should have documentation following this template:

	````elixir
	defmodule Tesla.Middleware.SomeMiddleware do
	@behaviour Tesla.Middleware

	@moduledoc """
	Short description what it does

	Longer description, including e.g. additional dependencies.


	### Example usage
	```
	defmodule MyClient do
	use Tesla

	plug Tesla.Middleware.SomeMiddleware, most: :common, options: "here"
	end
	```

	### Options
	- `:list` - all possible options
	- `:with` - their default values
	"""
	end
	````


	## Direct usage

	You can also use Tesla directly, without creating a client module.
	This however won’t include any middleware.

	```elixir
	# Example get request
	response = Tesla.get("http://httpbin.org/ip")
	response.status # => 200
	response.body # => '{\n "origin": "87.205.72.203"\n}\n'
	response.headers # => %{'Content-Type' => 'application/json' ...}


	response = Tesla.get("http://httpbin.org/get", query: [a: 1, b: "foo"])
	response.url # => "http://httpbin.org/get?a=1&b=foo"


	# Example post request
	response = Tesla.post("http://httpbin.org/post", "data", headers: %{"Content-Type" => "application/json"})
	```


	## Cheatsheet


	#### Making requests 101
	```elixir
	# GET /path
	get("/path")

	# GET /path?a=hi&b[]=1&b[]=2&b[]=3
	get("/path", query: [a: "hi", b: [1,2,3]])

	# GET with dynamic client
	get(client, "/path")
	get(client, "/path", query: [page: 3])

	# arguments are the same for GET, HEAD, OPTIONS & TRACE
	head("/path")
	options("/path")
	trace("/path")

	# POST, PUT, PATCH
	post("/path", "some-body-i-used-to-know")
	put("/path", "some-body-i-used-to-know", query: [a: "0"])
	patch("/path", multipart)
	```

	#### Configuring HTTP functions visibility
	```elixir
	# generate only get and post function
	use Tesla, only: ~w(get post)a

	# generate only delete fuction
	use Tesla, only: [:delete]

	# generate all functions except delete and options
	use Tesla, except: [:delete, :options]
	```

	#### Disable docs for HTTP functions
	```elixir
	use Tesla, docs: false
	```

	#### Decode only JSON response (do not encode request)
	```elixir
	plug Tesla.Middleware.DecodeJson
	```

	#### Use other JSON library
	```elixir
	# use JSX
	plug Tesla.Middleware.JSON, engine: JSX, engine_opts: [strict: [:comments]]

	# use custom functions
	plug Tesla.Middleware.JSON, decode: &JSX.decode/1, encode: &JSX.encode/1
	```


	#### Custom middleware
	```elixir
	defmodule Tesla.Middleware.MyCustomMiddleware do
	def call(env, next, options) do
	env
	\|> do_something_with_request
	\|> Tesla.run(next)
	\|> do_something_with_response
	end
	end
	```

	## Contributing

	1. Fork it (https://github.com/teamon/tesla/fork)
	2. Create your feature branch (`git checkout -b my-new-feature`)
	3. Commit your changes (`git commit -am 'Add some feature'`)
	4. Push to the branch (`git push origin my-new-feature`)
	5. Create new Pull Request

	## License

	This project is licensed under the MIT License - see the [LICENSE](LICENSE) file for details

	Copyright (c) 2015-2017 [Tymon Tobolski](http://teamon.eu/about/)
	diff --git a/lib/tesla/multipart.ex b/lib/tesla/multipart.ex
	index 82b8798..b68e4fb 100644
	--- a/lib/tesla/multipart.ex
	+++ b/lib/tesla/multipart.ex
	@@ -1,163 +1,172 @@
	defmodule Tesla.Multipart do
	@moduledoc """
	Multipart functionality.

	### Example
	```
	mp =
	Multipart.new
	\|> Multipart.add_content_type_param("charset=utf-8")
	\|> Multipart.add_field("field1", "foo")
	\|> Multipart.add_field("field2", "bar", headers: [{:"Content-Id", 1}, {:"Content-Type", "text/plain"}])
	\|> Multipart.add_file("test/tesla/multipart_test_file.sh")
	\|> Multipart.add_file("test/tesla/multipart_test_file.sh", name: "foobar")
	+ \|> Multipart.add_file_content("sample file content", "sample.txt")

	response = client.post(url, mp)
	```
	"""

	@boundary_chars "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789" \|> String.split("")

	@type part_stream :: IO.Stream.t \| File.Stream.t
	@type part_value :: String.t \| part_stream

	defstruct [
	parts: [],
	boundary: nil,
	content_type_params: []
	]

	@type t :: %__MODULE__ {
	parts: list(Part.t),
	boundary: String.t,
	content_type_params: [String.t]
	}

	defmodule Part do
	@moduledoc false

	defstruct [
	body: nil,
	dispositions: [],
	headers: [],
	]

	@type t :: %__MODULE__ {
	body: String.t,
	headers: Keyword.t,
	dispositions: Keyword.t,
	}
	end

	@doc """
	Create a new Multipart struct to be used for a request body.
	"""
	@spec new() :: t
	def new do
	%__MODULE__{boundary: unique_string(32)}
	end

	@doc """
	Add a parameter to the multipart content-type.
	"""
	@spec add_content_type_param(t, String.t) :: t
	def add_content_type_param(%__MODULE__{} = mp, param) do
	%{mp \| content_type_params: mp.content_type_params ++ [param]}
	end

	@doc """
	Add a field part.
	"""
	@spec add_field(t, String.t, part_value, Keyword.t) :: t
	def add_field(%__MODULE__{} = mp, name, value, opts \\ []) do
	{headers, opts} = Keyword.pop_first(opts, :headers, [])

	part = %Part{
	body: value,
	headers: headers,
	dispositions: [{:name, name}] ++ opts
	}
	%{mp \| parts: mp.parts ++ [part]}
	end

	@doc """
	Add a file part. The file will be streamed.

	Options:
	- `:name` - name of form param
	- `:filename` - filename (defaults to path basename)
	- `:headers` - additional headers
	"""
	@spec add_file(t, String.t, Keyword.t) :: t
	def add_file(%__MODULE__{} = mp, path, opts \\ []) do
	- {name, opts} = Keyword.pop_first(opts, :name, "file")
	+ data = File.stream!(path, [:read], 2048)
	{filename, opts} = Keyword.pop_first(opts, :filename, Path.basename(path))
	- {headers, opts} = Keyword.pop_first(opts, :headers, [])
	+ add_file_content(mp, data, filename, opts)
	+ end
	+
	+
	+ @doc """
	+ Add a file part. Same of `add_file/3` but the file content is read from `data` input parameter.
	+ """
	+ @spec add_file_content(t, part_value, String.t, Keyword.t) :: t
	+ def add_file_content(%__MODULE__{} = mp, data, filename, opts \\ []) do
	+ {name, opts} = Keyword.pop_first(opts, :name, "file")
	+ {headers, opts} = Keyword.pop_first(opts, :headers, [])
	{detect_content_type, opts} = Keyword.pop_first(opts, :detect_content_type, false)

	# add in detected content-type if necessary
	headers = case detect_content_type do
	true -> Keyword.put(headers, :"Content-Type", MIME.from_path(path))
	false -> headers
	end

	opts = opts ++ [filename: filename, headers: headers]

	- data = File.stream!(path, [:read], 2048)
	-
	add_field(mp, name, data, opts)
	end

	@doc false
	@spec headers(t) :: Keyword.t
	def headers(%__MODULE__{boundary: boundary, content_type_params: params}) do
	ct_params = (["boundary=#{boundary}"] ++ params) \|> Enum.join("; ")
	[{:"Content-Type", "multipart/form-data; #{ct_params}"}]
	end

	@doc false
	@spec body(t) :: part_stream
	def body(%__MODULE__{boundary: boundary, parts: parts}) do
	part_streams = Enum.map(parts, &(part_as_stream(&1, boundary)))
	Stream.concat(part_streams ++ [["--#{boundary}--\r\n"]])
	end

	@doc false
	@spec part_as_stream(t, String.t) :: part_stream
	def part_as_stream(%Part{body: body, dispositions: dispositions, headers: part_headers}, boundary) do
	part_headers = Enum.map(part_headers, fn {k, v} -> "#{k}: #{v}\r\n" end)
	part_headers = part_headers ++ [part_headers_for_disposition(dispositions)]

	enum_body = case body do
	b when is_binary(b)-> [b]
	b -> b
	end

	Stream.concat([
	["--#{boundary}\r\n"],
	part_headers,
	["\r\n"],
	enum_body,
	["\r\n"]
	])
	end

	@doc false
	@spec part_headers_for_disposition(Keyword.t) :: [String.t]
	def part_headers_for_disposition([]), do: []
	def part_headers_for_disposition(kvs) do
	ds =
	kvs
	\|> Enum.map(fn {k, v} -> "#{k}=\"#{v}\"" end)
	\|> Enum.join("; ")
	["Content-Disposition: form-data; #{ds}\r\n"]
	end

	@doc false
	@spec unique_string(pos_integer) :: String.t
	defp unique_string(length) do
	Enum.reduce((1..length), [], fn (_i, acc) ->
	[Enum.random(@boundary_chars) \| acc]
	end) \|> Enum.join("")
	end
	end

File Metadata

Mime Type: text/x-diff
Expires: Sat, Nov 23, 1:00 PM (1 d, 5 h)
Storage Engine: blob
Storage Format: Raw Data
Storage Handle: 38981
Default Alt Text: (19 KB)

No OneTemporaryActions

View Options

File Metadata

Event Timeline

No OneTemporary
Actions