Expose `impl_writeable_msg`

diff --git a/lightning/src/util/ser_macros.rs b/lightning/src/util/ser_macros.rs
index afd7fcb2e0fc93b3f536a052c15cec841f8b43b0..12662159f8b6376cf1bd24bb10044fbcf5eb134d 100644 (file)
--- a/lightning/src/util/ser_macros.rs
+++ b/lightning/src/util/ser_macros.rs
@@ -457,20 +457,50 @@ macro_rules! _decode_tlv_stream_range {
        } }
 }
 
+/// Implements [`Readable`]/[`Writeable`] for a message struct that may include non-TLV and
+/// TLV-encoded parts.
+///
+/// This is useful to implement a [`CustomMessageReader`].
+///
+/// Currently `$fieldty` may only be `option`, i.e., `$tlvfield` is optional field.
+///
+/// For example,
+/// ```
+/// # use lightning::impl_writeable_msg;
+/// struct MyCustomMessage {
+///    pub field_1: u32,
+///    pub field_2: bool,
+///    pub field_3: String,
+///    pub tlv_optional_integer: Option<u32>,
+/// }
+///
+/// impl_writeable_msg!(MyCustomMessage, {
+///    field_1,
+///    field_2,
+///    field_3
+/// }, {
+///    (1, tlv_optional_integer, option),
+/// });
+/// ```
+///
+/// [`Readable`]: crate::util::ser::Readable
+/// [`Writeable`]: crate::util::ser::Writeable
+/// [`CustomMessageReader`]: crate::ln::wire::CustomMessageReader
+#[macro_export]
 macro_rules! impl_writeable_msg {
        ($st:ident, {$($field:ident),* $(,)*}, {$(($type: expr, $tlvfield: ident, $fieldty: tt)),* $(,)*}) => {
                impl $crate::util::ser::Writeable for $st {
                        fn write<W: $crate::util::ser::Writer>(&self, w: &mut W) -> Result<(), $crate::io::Error> {
                                $( self.$field.write(w)?; )*
-                               encode_tlv_stream!(w, {$(($type, self.$tlvfield, $fieldty)),*});
+                               $crate::encode_tlv_stream!(w, {$(($type, self.$tlvfield, $fieldty)),*});
                                Ok(())
                        }
                }
                impl $crate::util::ser::Readable for $st {
                        fn read<R: $crate::io::Read>(r: &mut R) -> Result<Self, $crate::ln::msgs::DecodeError> {
                                $(let $field = $crate::util::ser::Readable::read(r)?;)*
-                               $(_init_tlv_field_var!($tlvfield, $fieldty);)*
-                               decode_tlv_stream!(r, {$(($type, $tlvfield, $fieldty)),*});
+                               $($crate::_init_tlv_field_var!($tlvfield, $fieldty);)*
+                               $crate::decode_tlv_stream!(r, {$(($type, $tlvfield, $fieldty)),*});
                                Ok(Self {
                                        $($field),*,
                                        $($tlvfield),*
@@ -642,10 +672,10 @@ macro_rules! _init_and_read_tlv_fields {
 }
 
 /// Implements [`Readable`]/[`Writeable`] for a struct storing it as a set of TLVs
-/// If `$fieldty` is `required`, then `$field` is a required field that is not an Option nor a Vec.
+/// If `$fieldty` is `required`, then `$field` is a required field that is not an [`Option`] nor a [`Vec`].
 /// If `$fieldty` is `(default_value, $default)`, then `$field` will be set to `$default` if not present.
 /// If `$fieldty` is `option`, then `$field` is optional field.
-/// If `$fieldty` is `vec_type`, then `$field` is a Vec, which needs to have its individual elements serialized.
+/// If `$fieldty` is `vec_type`, then `$field` is a [`Vec`], which needs to have its individual elements serialized.
 ///
 /// For example,
 /// ```