Tokio, processes, filesystems

tokiostdoutstderrtest/Cargo.lock

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tokiostdoutstderrtest/Cargo.toml

@@ -0,0 +1,7 @@
+[package]
+name = "tokiostdoutstderrtest"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+tokio = { version = "1.37.0", features = ["io-util", "rt", "macros", "process", "fs"] }

tokiostdoutstderrtest/README.md

@@ -0,0 +1,3 @@
+# TokioStdoutStdErrTest
+
+Testing some ideas of running an external process, while capturing stdout and stderr.

tokiostdoutstderrtest/src/main.rs

@@ -0,0 +1,56 @@
+use tokio::io::{AsyncReadExt, AsyncWriteExt};
+
+#[tokio::main(flavor = "current_thread")]
+async fn main() {
+    let command = "valgrind";
+    let args = vec!["-s", "--leak-check=full", "--track-origins=yes", "find", "/usr"];
+
+    let mut cmd = tokio::process::Command::new(&command)
+        .args(&args)
+        .stdout(std::process::Stdio::piped())
+        .stderr(std::process::Stdio::piped())
+        .spawn()
+        .unwrap();
+
+    let mut stdout = cmd.stdout.take().unwrap();
+    let mut stderr = cmd.stderr.take().unwrap();
+
+    let mut err_output = String::new();
+
+    let mut stdout_file = tokio::fs::OpenOptions::new()
+        .write(true)
+        .create(true)
+        .truncate(true)
+        .open("output.log")
+        .await
+        .unwrap();
+    let output_task = tokio::task::spawn(async move {
+        let _ = tokio::io::copy(&mut stdout, &mut stdout_file).await;
+    });
+
+    let mut stderr_file = tokio::fs::OpenOptions::new()
+        .write(true)
+        .create(true)
+        .truncate(true)
+        .open("err.log")
+        .await
+        .unwrap();
+    let stderr_task = tokio::task::spawn(async move {
+        let mut buffer = [0u8, 32];
+        while let Ok(bytes_read) = stderr.read(&mut buffer).await {
+            if bytes_read == 0 {
+                break;
+            }
+            stderr_file.write(&buffer).await.unwrap();
+            err_output.push_str(&String::from_utf8_lossy(&buffer));
+        }
+        err_output
+    });
+
+    let execution = cmd.wait().await.unwrap();
+    let err_output = stderr_task.await.unwrap();
+    output_task.await.unwrap();
+
+    println!("Execution={execution:?}");
+    println!("In stderr:\n{err_output}");
+}