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Concurrent feature tests for elixir
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lib/wallaby/metadata.ex
defmodule Wallaby.Metadata do
@moduledoc false
# Metadata is used to encode information about the browser and test. This
# information is then stored in a User Agent string. The information from the
# test can then be extracted in the application.
@prefix "BeamMetadata"
@regex ~r{#{@prefix} \((.*?)\)}
def append(user_agent, nil), do: user_agent
def append(user_agent, metadata) when is_map(metadata) or is_list(metadata) do
append(user_agent, format(metadata))
end
def append(user_agent, metadata) when is_binary(metadata) do
"#{user_agent}/#{metadata}"
end
@doc """
Formats a string to a valid UserAgent string.
"""
def format(metadata) do
encoded =
{:v1, metadata}
|> :erlang.term_to_binary()
|> Base.url_encode64()
"#{@prefix} (#{encoded})"
end
def extract(str) do
ua =
str
|> String.split("/")
|> List.last()
case Regex.run(@regex, ua) do
[_, metadata] -> parse(metadata)
_ -> %{}
end
end
def parse(encoded_metadata) do
encoded_metadata
|> Base.url_decode64!()
|> :erlang.binary_to_term()
|> case do
{:v1, metadata} -> metadata
_ -> raise Wallaby.BadMetadataError, message: "#{encoded_metadata} is not valid"
end
end
end