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livebook
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lib/livebook/runtime/attached.ex
defmodule Livebook.Runtime.Attached do
@moduledoc false
# A runtime backed by an Elixir node managed externally.
#
# Such node must be already started and available,
# Livebook doesn't manage its lifetime in any way
# and only loads/unloads the necessary elements.
# The node can be an ordinary Elixir runtime,
# a Mix project shell, a running release or anything else.
defstruct [:node, :cookie, :server_pid]
@type t :: %__MODULE__{
node: node(),
cookie: atom(),
server_pid: pid()
}
@doc """
Checks if the given node is available for use and initializes
it with Livebook-specific modules and processes.
"""
@spec init(node(), atom()) :: {:ok, t()} | {:error, :unreachable}
def init(node, cookie \\ Node.get_cookie()) do
# Set cookie for connecting to this specific node
Node.set_cookie(node, cookie)
case Node.ping(node) do
:pong ->
server_pid = Livebook.Runtime.ErlDist.initialize(node)
{:ok, %__MODULE__{node: node, cookie: cookie, server_pid: server_pid}}
:pang ->
{:error, :unreachable}
end
end
end
defimpl Livebook.Runtime, for: Livebook.Runtime.Attached do
alias Livebook.Runtime.ErlDist
def connect(runtime) do
ErlDist.RuntimeServer.set_owner(runtime.server_pid, self())
Process.monitor(runtime.server_pid)
end
def disconnect(runtime) do
ErlDist.RuntimeServer.stop(runtime.server_pid)
end
def evaluate_code(runtime, code, locator, prev_locator, opts \\ []) do
ErlDist.RuntimeServer.evaluate_code(runtime.server_pid, code, locator, prev_locator, opts)
end
def forget_evaluation(runtime, locator) do
ErlDist.RuntimeServer.forget_evaluation(runtime.server_pid, locator)
end
def drop_container(runtime, container_ref) do
ErlDist.RuntimeServer.drop_container(runtime.server_pid, container_ref)
end
def handle_intellisense(runtime, send_to, ref, request, locator) do
ErlDist.RuntimeServer.handle_intellisense(runtime.server_pid, send_to, ref, request, locator)
end
def duplicate(runtime) do
case Livebook.Runtime.Attached.init(runtime.node, runtime.cookie) do
{:ok, runtime} -> {:ok, runtime}
{:error, :unreachable} -> {:error, "node #{inspect(runtime.node)} is unreachable"}
end
end
def standalone?(_runtime), do: false
def read_file(runtime, path) do
ErlDist.RuntimeServer.read_file(runtime.server_pid, path)
end
end