sendmail: upgrade to async_std::process from the 1.8.0 release (#520)

.github/workflows/test.yml

@@ -6,6 +6,9 @@ on:
     branches:
       - master
 
+env:
+  RUST_BACKTRACE: full
+
 jobs:
   rustfmt:
     name: rustfmt / stable

Cargo.toml

@@ -52,7 +52,7 @@ futures-util = { version = "0.3.7", features = ["io"], optional = true }
 
 ## async-std
 async-attributes = { version = "1.1", optional = true }
-async-std = { version = "1.5", optional = true, features = ["unstable"] }
+async-std = { version = "1.8", optional = true, features = ["unstable"] }
 async-trait = { version = "0.1", optional = true }
 
 ## tokio

src/transport/sendmail/mod.rs

@@ -164,6 +164,25 @@ impl SendmailTransport {
             .stderr(Stdio::piped());
         c
     }
+
+    #[cfg(feature = "async-std1")]
+    fn async_std_command(&self, envelope: &Envelope) -> async_std::process::Command {
+        use async_std::process::Command;
+
+        let mut c = Command::new(&self.command);
+        // TODO: figure out why enabling this kills it earlier
+        // c.kill_on_drop(true);
+        c.arg("-i");
+        if let Some(from) = envelope.from() {
+            c.arg("-f").arg(from);
+        }
+        c.arg("--")
+            .args(envelope.to())
+            .stdin(Stdio::piped())
+            .stdout(Stdio::piped())
+            .stderr(Stdio::piped());
+        c
+    }
 }
 
 impl Default for SendmailTransport {
@@ -198,18 +217,15 @@ impl AsyncStd1Transport for SendmailTransport {
     type Error = Error;
 
     async fn send_raw(&self, envelope: &Envelope, email: &[u8]) -> Result<Self::Ok, Self::Error> {
-        let mut command = self.command(envelope);
-        let email = email.to_vec();
+        use async_std::io::prelude::WriteExt;
 
-        // TODO: Convert to real async, once async-std has a process implementation.
-        let output = async_std::task::spawn_blocking(move || {
-            // Spawn the sendmail command
-            let mut process = command.spawn()?;
+        let mut command = self.async_std_command(envelope);
 
-            process.stdin.as_mut().unwrap().write_all(&email)?;
-            process.wait_with_output()
-        })
-        .await?;
+        // Spawn the sendmail command
+        let mut process = command.spawn()?;
+
+        process.stdin.as_mut().unwrap().write_all(&email).await?;
+        let output = process.output().await?;
 
         if output.status.success() {
             Ok(())

tests/transport_sendmail.rs

@@ -39,6 +39,7 @@ mod test {
             .unwrap();
 
         let result = sender.send(email).await;
+        println!("{:?}", result);
         assert!(result.is_ok());
     }
 
@@ -58,6 +59,7 @@ mod test {
             .unwrap();
 
         let result = sender.send(email).await;
+        println!("{:?}", result);
         assert!(result.is_ok());
     }
 }