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diff --git a/lib/tesla/builder.ex b/lib/tesla/builder.ex
index 074c66f..f3687c6 100644
--- a/lib/tesla/builder.ex
+++ b/lib/tesla/builder.ex
@@ -1,334 +1,334 @@
defmodule Tesla.Builder do
@http_verbs ~w(head get delete trace options post put patch)a
defmacro __using__(opts \\ []) do
opts = Macro.prewalk(opts, &Macro.expand(&1, __CALLER__))
docs = Keyword.get(opts, :docs, true)
quote do
Module.register_attribute(__MODULE__, :__middleware__, accumulate: true)
Module.register_attribute(__MODULE__, :__adapter__, [])
if unquote(docs) do
@type option ::
{:method, Tesla.Env.method()}
| {:url, Tesla.Env.url()}
| {:query, Tesla.Env.query()}
| {:headers, Tesla.Env.headers()}
| {:body, Tesla.Env.body()}
| {:opts, Tesla.Env.opts()}
@doc """
Perform a request using client function
Options:
- `:method` - the request method, one of [:head, :get, :delete, :trace, :options, :post, :put, :patch]
- `:url` - either full url e.g. "http://example.com/some/path" or just "/some/path" if using `Tesla.Middleware.BaseUrl`
- `:query` - a keyword list of query params, e.g. `[page: 1, per_page: 100]`
- `:headers` - a keyworld list of headers, e.g. `[{"content-type", "text/plain"}]`
- `:body` - depends on used middleware:
- by default it can be a binary
- if using e.g. JSON encoding middleware it can be a nested map
- if adapter supports it it can be a Stream with any of the above
- `:opts` - custom, per-request middleware or adapter options
Examples:
ExampleApi.request(method: :get, url: "/users/path")
You can also use shortcut methods like:
ExampleApi.get("/users/1")
or
myclient |> ExampleApi.post("/users", %{name: "Jon"})
"""
@spec request(Tesla.Env.client(), [option]) :: Tesla.Env.t()
else
@doc false
end
def request(%Tesla.Client{} = client, options) do
Tesla.execute(__MODULE__, client, options)
end
if unquote(docs) do
@doc """
Perform a request. See `request/2` for available options.
"""
@spec request([option]) :: Tesla.Env.t()
else
@doc false
end
def request(options) do
Tesla.execute(__MODULE__, %Tesla.Client{}, options)
end
unquote(generate_http_verbs(opts))
import Tesla.Builder, only: [plug: 1, plug: 2, adapter: 1, adapter: 2]
@before_compile Tesla.Builder
end
end
@doc """
Attach middleware to your API client
```ex
defmodule ExampleApi do
use Tesla
# plug middleware module with options
plug Tesla.Middleware.BaseUrl, "http://api.example.com"
plug Tesla.Middleware.JSON, engine: Poison
# plug middleware function
plug :handle_errors
# middleware function gets two parameters: Tesla.Env and the rest of middleware call stack
# and must return Tesla.Env
def handle_errors(env, next) do
env
|> modify_env_before_request
|> Tesla.run(next) # run the rest of stack
|> modify_env_after_request
end
end
"""
defmacro plug(middleware, opts \\ nil) do
quote do: @__middleware__({unquote(Macro.escape(middleware)), unquote(Macro.escape(opts))})
end
@doc """
Choose adapter for your API client
```ex
defmodule ExampleApi do
use Tesla
# set adapter as module
adapter Tesla.Adapter.Hackney
# set adapter as function
adapter :local_adapter
# set adapter as anonymous function
adapter fn env ->
...
env
end
# adapter function gets Tesla.Env as parameter and must return Tesla.Env
def local_adapter(env) do
...
env
end
end
"""
defmacro adapter(adapter, opts \\ nil) do
quote do: @__adapter__({unquote(Macro.escape(adapter)), unquote(Macro.escape(opts))})
end
defp generate_http_verbs(opts) do
only = Keyword.get(opts, :only, @http_verbs)
except = Keyword.get(opts, :except, [])
@http_verbs
- |> Enum.filter(&(&1 in only && &1 not in except))
+ |> Enum.filter(&(&1 in only && not &1 in except))
|> Enum.map(&generate_api(&1, Keyword.get(opts, :docs, true)))
end
defp generate_api(method, docs) when method in [:post, :put, :patch] do
quote do
if unquote(docs) do
@doc """
Perform a #{unquote(method |> to_string |> String.upcase())} request.
See `request/1` or `request/2` for options definition.
Example
myclient |> ExampleApi.#{unquote(method)}("/users", %{name: "Jon"}, query: [scope: "admin"])
"""
@spec unquote(method)(Tesla.Env.client(), Tesla.Env.url(), Tesla.Env.body(), [option]) ::
Tesla.Env.t()
else
@doc false
end
def unquote(method)(%Tesla.Client{} = client, url, body, options) when is_list(options) do
request(client, [method: unquote(method), url: url, body: body] ++ options)
end
# fallback to keep backward compatibility
def unquote(method)(fun, url, body, options) when is_function(fun) and is_list(options) do
unquote(method)(%Tesla.Client{fun: fun}, url, body, options)
end
if unquote(docs) do
@doc """
Perform a #{unquote(method |> to_string |> String.upcase())} request.
See `request/1` or `request/2` for options definition.
Example
myclient |> ExampleApi.#{unquote(method)}("/users", %{name: "Jon"})
ExampleApi.#{unquote(method)}("/users", %{name: "Jon"}, query: [scope: "admin"])
"""
@spec unquote(method)(Tesla.Env.client(), Tesla.Env.url(), Tesla.Env.body()) ::
Tesla.Env.t()
else
@doc false
end
def unquote(method)(%Tesla.Client{} = client, url, body) do
request(client, method: unquote(method), url: url, body: body)
end
# fallback to keep backward compatibility
def unquote(method)(fun, url, body) when is_function(fun) do
unquote(method)(%Tesla.Client{fun: fun}, url, body)
end
if unquote(docs) do
@spec unquote(method)(Tesla.Env.url(), Tesla.Env.body(), [option]) :: Tesla.Env.t()
else
@doc false
end
def unquote(method)(url, body, options) when is_list(options) do
request([method: unquote(method), url: url, body: body] ++ options)
end
if unquote(docs) do
@doc """
Perform a #{unquote(method |> to_string |> String.upcase())} request.
See `request/1` or `request/2` for options definition.
Example
ExampleApi.#{unquote(method)}("/users", %{name: "Jon"})
"""
@spec unquote(method)(Tesla.Env.url(), Tesla.Env.body()) :: Tesla.Env.t()
else
@doc false
end
def unquote(method)(url, body) do
request(method: unquote(method), url: url, body: body)
end
end
end
defp generate_api(method, docs) when method in [:head, :get, :delete, :trace, :options] do
quote do
if unquote(docs) do
@doc """
Perform a #{unquote(method |> to_string |> String.upcase())} request.
See `request/1` or `request/2` for options definition.
Example
myclient |> ExampleApi.#{unquote(method)}("/users", query: [page: 1])
"""
@spec unquote(method)(Tesla.Env.client(), Tesla.Env.url(), [option]) :: Tesla.Env.t()
else
@doc false
end
def unquote(method)(%Tesla.Client{} = client, url, options) when is_list(options) do
request(client, [method: unquote(method), url: url] ++ options)
end
# fallback to keep backward compatibility
def unquote(method)(fun, url, options) when is_function(fun) and is_list(options) do
unquote(method)(%Tesla.Client{fun: fun}, url, options)
end
if unquote(docs) do
@doc """
Perform a #{unquote(method |> to_string |> String.upcase())} request.
See `request/1` or `request/2` for options definition.
Example
myclient |> ExampleApi.#{unquote(method)}("/users")
ExampleApi.#{unquote(method)}("/users", query: [page: 1])
"""
@spec unquote(method)(Tesla.Env.client(), Tesla.Env.url()) :: Tesla.Env.t()
else
@doc false
end
def unquote(method)(%Tesla.Client{} = client, url) do
request(client, method: unquote(method), url: url)
end
# fallback to keep backward compatibility
def unquote(method)(fun, url) when is_function(fun) do
unquote(method)(%Tesla.Client{fun: fun}, url)
end
if unquote(docs) do
@spec unquote(method)(Tesla.Env.url(), [option]) :: Tesla.Env.t()
else
@doc false
end
def unquote(method)(url, options) when is_list(options) do
request([method: unquote(method), url: url] ++ options)
end
if unquote(docs) do
@doc """
Perform a #{unquote(method |> to_string |> String.upcase())} request.
See `request/1` or `request/2` for options definition.
Example
ExampleApi.#{unquote(method)}("/users")
"""
@spec unquote(method)(Tesla.Env.url()) :: Tesla.Env.t()
else
@doc false
end
def unquote(method)(url) do
request(method: unquote(method), url: url)
end
end
end
defmacro __before_compile__(env) do
adapter =
env.module
|> Module.get_attribute(:__adapter__)
|> prepare()
middleware =
env.module
|> Module.get_attribute(:__middleware__)
|> Enum.reverse()
|> prepare()
quote do
def __middleware__, do: unquote(middleware)
def __adapter__, do: unquote(adapter)
end
end
defmacro client(pre, post) do
quote do
%Tesla.Client{
pre: unquote(prepare(pre)),
post: unquote(prepare(post))
}
end
end
defp prepare(list) when is_list(list), do: Enum.map(list, &prepare/1)
defp prepare(nil), do: nil
defp prepare({{:fn, _, _} = fun, nil}), do: {:fn, fun}
defp prepare({{:__aliases__, _, _} = name, opts}),
do: quote(do: {unquote(name), :call, [unquote(opts)]})
defp prepare({name, nil}) when is_atom(name), do: quote(do: {__MODULE__, unquote(name), []})
defp prepare(name), do: prepare({name, nil})
end

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