tokio_xmpp: Replace std stuff with alloc/core stuff

tokio-xmpp/examples/keep_connection.rs

@@ -10,10 +10,10 @@
 //! as good as it can, transparently reconnecting on interruptions of the TCP
 //! stream.
 
+use core::str::FromStr;
+use core::time::Duration;
 use std::env::args;
 use std::process::exit;
-use std::str::FromStr;
-use std::time::Duration;
 
 use rand::{thread_rng, Rng};
 

tokio-xmpp/src/client/login.rs

@@ -1,12 +1,12 @@
+use alloc::borrow::Cow;
+use core::str::FromStr;
 use futures::{SinkExt, StreamExt};
 use sasl::client::mechanisms::{Anonymous, Plain, Scram};
 use sasl::client::Mechanism;
 use sasl::common::scram::{Sha1, Sha256};
 use sasl::common::Credentials;
-use std::borrow::Cow;
 use std::collections::HashSet;
 use std::io;
-use std::str::FromStr;
 use tokio::io::{AsyncBufRead, AsyncWrite};
 use xmpp_parsers::{
     jid::Jid,

tokio-xmpp/src/client/stream.rs

@@ -4,9 +4,8 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
+use core::{pin::Pin, task::Context};
 use futures::{ready, task::Poll, Stream};
-use std::pin::Pin;
-use std::task::Context;
 
 use crate::{
     client::Client,

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};
 

tokio-xmpp/src/error.rs

@@ -1,13 +1,10 @@
+use core::{error::Error as StdError, fmt, net::AddrParseError, str::Utf8Error};
 #[cfg(feature = "dns")]
 use hickory_resolver::{
     error::ResolveError as DnsResolveError, proto::error::ProtoError as DnsProtoError,
 };
 use sasl::client::MechanismError as SaslMechanismError;
-use std::error::Error as StdError;
-use std::fmt;
 use std::io::Error as IoError;
-use std::net::AddrParseError;
-use std::str::Utf8Error;
 
 use crate::{
     connect::ServerConnectorError, jid, minidom,

tokio-xmpp/src/lib.rs

@@ -46,6 +46,8 @@ compile_error!(
     "when starttls feature enabled one of tls-native and tls-rust features must be enabled."
 );
 
+extern crate alloc;
+
 pub use parsers::{jid, minidom};
 pub use xmpp_parsers as parsers;
 

tokio-xmpp/src/xmlstream/common.rs

@@ -4,11 +4,13 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-use core::future::Future;
-use core::pin::Pin;
-use core::task::{Context, Poll};
-use core::time::Duration;
-use std::borrow::Cow;
+use alloc::borrow::Cow;
+use core::{
+    future::Future,
+    pin::Pin,
+    task::{Context, Poll},
+    time::Duration,
+};
 use std::io;
 
 use futures::{ready, Sink, SinkExt, Stream, StreamExt};

tokio-xmpp/src/xmlstream/mod.rs

@@ -114,7 +114,7 @@ struct LogXsoBuf<'x>(&'x [u8]);
 impl<'x> fmt::Display for LogXsoBuf<'x> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         // We always generate UTF-8, so this should be good... I think.
-        let text = std::str::from_utf8(&self.0).unwrap();
+        let text = core::str::from_utf8(&self.0).unwrap();
         #[cfg(feature = "syntax-highlighting")]
         let text = highlight_xml(text);
         f.write_str(&text)
@@ -195,7 +195,7 @@ impl fmt::Display for ReadError {
 }
 
 impl core::error::Error for ReadError {
-    fn source(&self) -> Option<&(dyn std::error::Error + 'static)> {
+    fn source(&self) -> Option<&(dyn core::error::Error + 'static)> {
         match self {
             ReadError::HardError(e) => Some(e),
             ReadError::ParseError(e) => Some(e),

tokio-xmpp/src/xmlstream/tests.rs

@@ -4,7 +4,7 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this
 // file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
-use std::time::Duration;
+use core::time::Duration;
 
 use futures::{SinkExt, StreamExt};