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An Elixir Session Initiation Protocol (SIP) stack.
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lib/sippet/core.ex
defmodule Sippet.Core do
@moduledoc """
A behaviour module for implementing the `Sippet.Core`.
The `Sippet.Core` designates a particular type of SIP entity, i.e., specific
to either a stateful or stateless proxy, a user agent or registrar.
"""
alias Sippet.{Message, Transactions}
@doc """
Receives a new incoming request from a remote host, or ACK.
The `server_key` indicates the name of the transaction created when
the request was received. If it is an ACK, then the `server_key` is
`nil`.
The function `receive_request/2` is called from the server transaction
process when the parameter `server_key` is not `nil`, and from the
transport process (possibly a `poolboy` worker process), when the
`server_key` is `nil`.
"""
@callback receive_request(
incoming_request :: Message.request(),
server_key :: Transactions.Server.Key.t() | nil
) ::
any
@doc """
Receives a response for a sent request.
The `client_key` indicates the name of the transaction created when
the request was sent using `Sippet.Transactions.send_request/1`.
The function `receive_response/2` is called from the client transaction
process when the parameter `client_key` is not `nil`, and from the
transport process (possibly a `poolboy` worker process), when the
`client_key` is `nil`.
"""
@callback receive_response(
incoming_response :: Message.response(),
client_key :: Transactions.Client.Key.t() | nil
) ::
any
@doc """
Receives an error from the server or client transaction.
The function `receive_error/2` is called from the client or server
transaction process created when sending or receiving requests.
"""
@callback receive_error(
reason :: term,
client_or_server_key ::
Transactions.Client.Key.t()
| Transactions.Server.Key.t()
) ::
any
defmacro __using__(_opts) do
quote location: :keep do
@behaviour Sippet.Core
@doc false
def receive_request(_incoming_request, _server_key) do
raise "attempted to call Core but no receive_request/2 was provided"
end
@doc false
def receive_response(incoming_response, client_key) do
raise "attempted to call Core but no receive_response/2 was provided"
end
@doc false
def receive_error(reason, client_or_server_key) do
raise "attempted to call Core but no receive_error/2 was provided"
end
defoverridable receive_request: 2,
receive_response: 2,
receive_error: 2
end
end
end