make mycelium optional

1 files changed, 24 insertions, 2 deletions

diff --git a/src/transport/sim.rs b/src/transport/sim.rs
index 500050b..2410bba 100644
--- a/src/transport/sim.rs
+++ b/src/transport/sim.rs
@@ -2,7 +2,8 @@
 //! [`SimTransport`] on a shared [`SimNet`].
 //!
 //! Messages go through the Mycelium wire encoding (`mycelium::encode_message`), so the
-//! codec is exercised as in production. The net delays, loses and duplicates them per
+//! codec is exercised as in production; without the mycelium feature, through the wire
+//! encoding alone, as libp2p and Tor send it. The net delays, loses and duplicates them per
 //! link, from a seeded generator; nodes can be taken down (everything to and from them
 //! is lost) and brought up again; and a test can inject a message as if a node had sent
 //! it, e.g. one that arrives late.
@@ -24,7 +25,8 @@ use bytes::Bytes;
 use tokio::sync::{mpsc, oneshot};
 use tracing::{debug, warn};
 
-use super::mycelium::{decode_message, encode_message};
+#[cfg(feature = "mycelium")]
+pub(crate) use super::mycelium::{decode_message, encode_message};
 use super::{EncodedMessage, MessageHandler, MessageKind, ParsedMessage, Transport};
 use crate::locks::MutexExt;
 use crate::testrand::Rng;
@@ -249,6 +251,26 @@ pub(crate) struct SimTransport {
     inbox: tokio::sync::Mutex<Option<mpsc::UnboundedReceiver<Delivery>>>,
 }
 
+/// Without Mycelium: a message in the wire encoding alone, as libp2p and Tor send it.
+#[cfg(not(feature = "mycelium"))]
+pub(crate) fn encode_message(peer: &str, message: &ParsedMessage) -> Result<EncodedMessage> {
+    let body = super::wire::encode(message)?;
+    Ok(EncodedMessage {
+        peer: peer.to_owned(),
+        address: peer.to_owned(),
+        payload_len: body.len(),
+        body: body.into(),
+        kind: message.kind(),
+        message: None,
+    })
+}
+
+/// The message in a body made by [`encode_message`].
+#[cfg(not(feature = "mycelium"))]
+pub(crate) fn decode_message(body: &[u8]) -> Result<ParsedMessage> {
+    Ok(super::wire::decode(body)?)
+}
+
 #[async_trait]
 impl Transport for SimTransport {
     fn local_id(&self) -> &str {