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An Elixir Session Initiation Protocol (SIP) stack.
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lib/sippet/transactions/server/key.ex
defmodule Sippet.Transactions.Server.Key do
@moduledoc """
Defines a key in which server 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
@typedoc "The topmost Via header sent-by parameter"
@type sentby :: {shost :: binary, sport :: integer}
@type t :: %__MODULE__{
branch: binary,
method: Message.method,
sentby: sentby
}
defstruct [
branch: nil,
method: nil,
sentby: nil
]
@doc """
Creates a server transaction identifier.
"""
@spec new(branch, Message.method, sentby) :: t
def new(branch, method, sentby) do
%__MODULE__{
branch: branch,
method: if(method == :ack, do: :invite, else: method),
sentby: sentby
}
end
@doc """
Creates a server transaction identifier from an incoming request or an
outgoing response. If they are related, they will be equal.
"""
@spec new(Message.t) :: t
def new(%Message{start_line: %RequestLine{}} = incoming_request) do
method = incoming_request.start_line.method
# Take the topmost via branch
{_version, _protocol, sentby, %{"branch" => branch}} =
hd(incoming_request.headers.via)
new(branch, method, sentby)
end
def new(%Message{start_line: %StatusLine{}} = outgoing_response) do
{_sequence, method} = outgoing_response.headers.cseq
# Take the topmost via sent-by and branch
{_version, _protocol, sentby, %{"branch" => branch}} =
hd(outgoing_response.headers.via)
new(branch, method, sentby)
end
end
defimpl String.Chars, for: Sippet.Transactions.Server.Key do
def to_string(%Sippet.Transactions.Server.Key{} = key) do
{host, port} = key.sentby
"#{key.branch}/#{key.method}/#{host}:#{port}"
end
end