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An Elixir Session Initiation Protocol (SIP) stack.
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lib/sippet/transactions/client/key.ex
defmodule Sippet.Transactions.Client.Key do
@moduledoc """
Defines a key in which client transactions are uniquely identified.
"""
alias Sippet.Message, as: Message
alias Sippet.Message.RequestLine, as: RequestLine
alias Sippet.Message.StatusLine, as: StatusLine
@typedoc "The topmost Via header branch parameter"
@type branch :: binary
@type t :: %__MODULE__{
branch: binary,
method: Message.method
}
defstruct [
branch: nil,
method: nil
]
@doc """
Create a client transaction identifier.
"""
@spec new(branch, Message.method) :: t
def new(branch, method)
when is_binary(method) or is_atom(method) do
%__MODULE__{branch: branch, method: method}
end
@doc """
Create a client transaction identifier from an outgoing request or an
incoming response. If they are related, they will be equal.
"""
@spec new(Message.t) :: t
def new(%Message{start_line: %RequestLine{}} = outgoing_request) do
method = outgoing_request.start_line.method
# Take the topmost via branch
{_version, _protocol, _sent_by, %{"branch" => branch}} =
hd(outgoing_request.headers.via)
new(branch, method)
end
def new(%Message{start_line: %StatusLine{}} = incoming_response) do
{_sequence, method} = incoming_response.headers.cseq
# Take the topmost via branch
{_version, _protocol, _sent_by, %{"branch" => branch}} =
hd(incoming_response.headers.via)
new(branch, method)
end
## Helpers
defimpl String.Chars do
def to_string(%{branch: branch, method: method}),
do: "#{branch}:#{method}"
end
defimpl Inspect do
def inspect(%{branch: branch, method: method}, _),
do: "~K[#{branch}|#{inspect method}]"
end
end