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🌲 Great Elixir Logging Made Easy. Official Timber.io Integration.
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lib/timber/contexts/http_request_context.ex
defmodule Timber.Contexts.HTTPRequestContext do
@moduledoc """
The HTTP request context tracks incoming HTTP requests
Timber can automatically add incoming HTTP requests to the stack if
you use a `Plug` based framework through the `Timber.Plug`.
"""
@type t :: %__MODULE__{
host: String.t,
headers: headers,
method: method,
path: String.t,
port: pos_integer,
scheme: scheme,
query_params: %{String.t => String.t},
}
@type method :: :connect | :delete | :get | :head | :options | :post | :put | :trace
@type scheme :: :https | :http
@type headers :: %{
content_type: String.t,
remote_addr: String.t,
referrer: String.t,
request_id: String.t,
user_agent: String.t
}
defstruct [:host, :headers, :method, :path, :port, :scheme, :query_params]
@recognized_headers ~w(
content-type
referrer
user-agent
x-forwarded-for
x-request-id
)
@doc """
Takes a list of two-element tuples representing HTTP request headers and
returns a map of the recognized headers Timber handles
"""
@spec headers_from_list([{String.t, String.t}]) :: headers
def headers_from_list(headers) do
Enum.filter_map(headers, &header_filter/1, &header_to_keyword/1)
|> Enum.into(%{})
end
@spec headers_from_list({String.t, String.t}) :: boolean
defp header_filter({name, _}) when name in @recognized_headers, do: true
defp header_filter(_), do: false
@spec header_to_keyword({String.t, String.t}) :: {atom, String.t}
defp header_to_keyword({"x-forwarded-for", ip}), do: {:remote_addr, ip}
defp header_to_keyword({"x-request-id", id}), do: {:request_id, id}
defp header_to_keyword({name, value}), do: {String.to_existing_atom(name), value}
@spec method_from_string(String.t) :: method
def method_from_string(method) do
String.downcase(method)
|> String.to_existing_atom()
end
end