tokio_xmpp: Replace std stuff with alloc/core stuff

tokio-xmpp/src/connect/dns.rs

@@ -1,3 +1,4 @@
+use core::{fmt, net::SocketAddr};
 #[cfg(feature = "dns")]
 use futures::{future::select_ok, FutureExt};
 #[cfg(feature = "dns")]
@@ -6,7 +7,6 @@ use hickory_resolver::{
 };
 #[cfg(feature = "dns")]
 use log::debug;
-use std::net::SocketAddr;
 use tokio::net::TcpStream;
 
 use crate::Error;
@@ -43,8 +43,8 @@ pub enum DnsConfig {
     },
 }
 
-impl std::fmt::Display for DnsConfig {
-    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+impl fmt::Display for DnsConfig {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         match self {
             #[cfg(feature = "dns")]
             Self::UseSrv { host, .. } => write!(f, "{}", host),

tokio-xmpp/src/connect/mod.rs

@@ -25,7 +25,7 @@ pub trait AsyncReadAndWrite: AsyncBufRead + AsyncWrite + Unpin + Send {}
 impl<T: AsyncBufRead + AsyncWrite + Unpin + Send> AsyncReadAndWrite for T {}
 
 /// Trait that must be extended by the implementation of ServerConnector
-pub trait ServerConnectorError: std::error::Error + Sync + Send {}
+pub trait ServerConnectorError: core::error::Error + Sync + Send {}
 
 /// Trait called to connect to an XMPP server, perhaps called multiple times
 pub trait ServerConnector: Clone + core::fmt::Debug + Send + Unpin + 'static {
@@ -37,7 +37,7 @@ pub trait ServerConnector: Clone + core::fmt::Debug + Send + Unpin + 'static {
         jid: &Jid,
         ns: &'static str,
         timeouts: Timeouts,
-    ) -> impl std::future::Future<
+    ) -> impl core::future::Future<
         Output = Result<(PendingFeaturesRecv<Self::Stream>, ChannelBinding), Error>,
     > + Send;
 }

tokio-xmpp/src/connect/starttls.rs

@@ -1,10 +1,9 @@
 //! `starttls::ServerConfig` provides a `ServerConnector` for starttls connections
 
+use alloc::borrow::Cow;
+use core::{error::Error as StdError, fmt};
 #[cfg(feature = "tls-native")]
 use native_tls::Error as TlsError;
-use std::borrow::Cow;
-use std::error::Error as StdError;
-use std::fmt;
 use std::io;
 use std::os::fd::AsRawFd;
 #[cfg(all(feature = "tls-rust", not(feature = "tls-native")))]
@@ -16,7 +15,7 @@ use futures::{sink::SinkExt, stream::StreamExt};
 
 #[cfg(all(feature = "tls-rust", not(feature = "tls-native")))]
 use {
-    std::sync::Arc,
+    alloc::sync::Arc,
     tokio_rustls::{
         rustls::pki_types::ServerName,
         rustls::{ClientConfig, RootCertStore},

tokio-xmpp/src/connect/tcp.rs

@@ -1,6 +1,6 @@
 //! `starttls::ServerConfig` provides a `ServerConnector` for starttls connections
 
-use std::borrow::Cow;
+use alloc::borrow::Cow;
 
 use tokio::{io::BufStream, net::TcpStream};