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Types and functions for programs running on Erlang!

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gleam_erlang src gleam erlang node.gleam
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src/gleam/erlang/node.gleam 

import gleam/erlang/atom.{type Atom}



pub type Node



type DoNotLeak



/// Return the current node.

///

@external(erlang, "erlang", "node")

pub fn self() -> Node



/// Return a list of all visible nodes in the cluster, not including the current

/// node.

///

/// The current node can be included by calling `self()` and prepending the

/// result.

///

/// ```gleam

/// let all_nodes = [node.self(), ..node.visible()]

/// ```

///

@external(erlang, "erlang", "nodes")

pub fn visible() -> List(Node)



pub type ConnectError {

  /// Was unable to connect to the node.

  FailedToConnect

  /// The local node is not alive, so it is not possible to connect to the other

  /// node.

  LocalNodeIsNotAlive

}



// TODO: test unknown node

// TODO: test successfully connecting

/// Establish a connection to a node, so the nodes can send messages to each

/// other and any other connected nodes.

///

/// Returns `Error(FailedToConnect)` if the node is not reachable.

///

/// Returns `Error(LocalNodeIsNotAlive)` if the local node is not alive, meaning

/// it is not running in distributed mode.

///

@external(erlang, "gleam_erlang_ffi", "connect_node")

pub fn connect(node: Atom) -> Result(Node, ConnectError)



// TODO: test

/// Send a message to a named process on a given node.

///

/// These messages are untyped, like regular Erlang messages.

///

pub fn send(node: Node, name: Atom, message: message) -> Nil {

  raw_send(#(name, node), message)

  Nil

}



@external(erlang, "erlang", "send")

fn raw_send(receiver: #(Atom, Node), message: message) -> DoNotLeak



/// Convert a node to the atom of its name.

///

@external(erlang, "gleam_erlang_ffi", "identity")

pub fn to_atom(node: Node) -> Atom