fix(autonat::v2::client): DialBackError visibility

Cargo.toml

@@ -76,7 +76,7 @@ edition = "2021"
 [workspace.dependencies]
 libp2p = { version = "0.56.0", path = "libp2p" }
 libp2p-allow-block-list = { version = "0.6.0", path = "misc/allow-block-list" }
-libp2p-autonat = { version = "0.15.0", path = "protocols/autonat" }
+libp2p-autonat = { version = "0.16.0", path = "protocols/autonat" }
 libp2p-connection-limits = { version = "0.6.0", path = "misc/connection-limits" }
 libp2p-core = { version = "0.43.1", path = "core" }
 libp2p-dcutr = { version = "0.14.0", path = "protocols/dcutr" }

protocols/autonat/CHANGELOG.md

@@ -1,3 +1,6 @@
+## 0.16.0
+- Fix `DialBackError` visibility so downstream could differentiate between `NoConnection` and `StreamFailed`.
+  See [PR 6168](https://github.com/libp2p/rust-libp2p/pull/6168).
 ## 0.15.0
 
 - Fix infinity loop on wrong `nonce` when performing `dial_back`.

protocols/autonat/Cargo.toml

@@ -3,7 +3,7 @@ name = "libp2p-autonat"
 edition.workspace = true
 rust-version = { workspace = true }
 description = "NAT and firewall detection for libp2p"
-version = "0.15.0"
+version = "0.16.0"
 authors = [
     "David Craven <[email protected]>",
     "Elena Frank <[email protected]>",

protocols/autonat/src/v2/client.rs

@@ -2,3 +2,4 @@ mod behaviour;
 mod handler;
 
 pub use behaviour::{Behaviour, Config, Event};
+pub use handler::dial_request::DialBackError;

protocols/autonat/src/v2/client/behaviour.rs

@@ -1,6 +1,6 @@
 use std::{
     collections::{HashMap, VecDeque},
-    fmt::{Debug, Display, Formatter},
+    fmt::Debug,
     task::{Context, Poll},
     time::Duration,
 };
@@ -239,7 +239,7 @@ where
             tested_addr,
             bytes_sent,
             server: peer_id,
-            result: result.map_err(|e| Error { inner: e }),
+            result,
         }));
     }
 
@@ -374,22 +374,6 @@ impl Default for Behaviour<OsRng> {
     }
 }
 
-pub struct Error {
-    pub(crate) inner: dial_request::DialBackError,
-}
-
-impl Display for Error {
-    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
-        Display::fmt(&self.inner, f)
-    }
-}
-
-impl Debug for Error {
-    fn fmt(&self, f: &mut Formatter<'_>) -> std::fmt::Result {
-        Debug::fmt(&self.inner, f)
-    }
-}
-
 #[derive(Debug)]
 pub struct Event {
     /// The address that was selected for testing.
@@ -402,7 +386,7 @@ pub struct Event {
     pub server: PeerId,
     /// The result of the test. If the test was successful, this is `Ok(())`.
     /// Otherwise it's an error.
-    pub result: Result<(), Error>,
+    pub result: Result<(), dial_request::DialBackError>,
 }
 
 struct ConnectionInfo {

protocols/autonat/src/v2/client/handler/dial_request.rs

@@ -62,8 +62,10 @@ impl From<io::Error> for Error {
 
 #[derive(thiserror::Error, Debug)]
 pub enum DialBackError {
+    /// Tells that the client is actually behind NAT for this connection.
     #[error("server failed to establish a connection")]
     NoConnection,
+    /// Can't tell new information as dialing back couldn't be finished for a lower level reason.
     #[error("dial back stream failed")]
     StreamFailed,
 }