From 952af29ecd3ae62036417114a3d0384930ac1edd Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Antoine=20B=C3=BCsch?= <antoine.busch@gmail.com>
Date: Mon, 1 Oct 2018 15:16:21 +1000
Subject: Add InterlacedTty

---
 src/tty.rs | 107 +++++++++++++++++++++++++++++++++++++++++--------------------
 1 file changed, 72 insertions(+), 35 deletions(-)

(limited to 'src/tty.rs')

diff --git a/src/tty.rs b/src/tty.rs
index 612a7d2..34ba93f 100644
--- a/src/tty.rs
+++ b/src/tty.rs
@@ -3,6 +3,12 @@ use byteorder::{BigEndian, ReadBytesExt};
 use std::io::Cursor;
 use std::io::Read;
 
+#[derive(Debug)]
+pub enum TtyLine {
+    StdOut(String),
+    StdErr(String),
+}
+
 pub struct Tty {
     pub stdout: String,
     pub stderr: String,
@@ -10,44 +16,75 @@ pub struct Tty {
 
 // https://docs.docker.com/engine/api/v1.26/#operation/ContainerAttach
 impl Tty {
-    pub fn new(mut stream: Box<Read>) -> Tty {
-        let mut stdout: Vec<u8> = vec![];
-        let mut stderr: Vec<u8> = vec![];
-        loop {
-            // 8 byte header [ STREAM_TYPE, 0, 0, 0, SIZE1, SIZE2, SIZE3, SIZE4 ]
-            let mut header = [0; 8];
-            match stream.read_exact(&mut header) {
-                Ok(_) => {
-                    let payload_size: Vec<u8> = header[4..8].to_vec();
-                    let mut buffer = vec![
-                        0;
-                        Cursor::new(&payload_size)
-                            .read_u32::<BigEndian>()
-                            .unwrap() as
-                            usize
-                    ];
-                    match stream.read_exact(&mut buffer) {
-                        Ok(_) => {
-                            match header[0] {
-                                // stdin, unhandled
-                                0 => break,
-                                // stdout
-                                1 => stdout.append(&mut buffer),
-                                // stderr
-                                2 => stderr.append(&mut buffer),
-                                //unhandled
-                                _ => break,
-                            }
-                        }
-                        Err(_) => break,
-                    };
-                }
-                Err(_) => break,
+    pub fn new(stream: impl Read) -> Tty {
+        let mut stdout: Vec<String> = vec![];
+        let mut stderr: Vec<String> = vec![];
+
+        let lines = demux(stream);
+        for line in lines {
+            match line {
+                TtyLine::StdOut(s) => stdout.push(s),
+                TtyLine::StdErr(s) => stderr.push(s),
             }
         }
+
         Tty {
-            stdout: String::from_utf8_lossy(&stdout).to_string(),
-            stderr: String::from_utf8_lossy(&stderr).to_string(),
+            stdout: stdout.concat(),
+            stderr: stderr.concat(),
+        }
+    }
+}
+
+/// Used to demux the output of Docker log, but still keep lines from stdout and stderr interlaced
+/// in the right order.
+pub struct InterlacedTty {
+    pub lines: Vec<TtyLine>,
+}
+
+// https://docs.docker.com/engine/api/v1.26/#operation/ContainerAttach
+impl InterlacedTty {
+    pub fn new(stream: impl Read) -> InterlacedTty {
+        let lines = demux(stream);
+
+        InterlacedTty { lines }
+    }
+}
+
+fn demux(mut stream: impl Read) -> Vec<TtyLine> {
+    let mut lines: Vec<TtyLine> = vec![];
+    loop {
+        // 8 byte header [ STREAM_TYPE, 0, 0, 0, SIZE1, SIZE2, SIZE3, SIZE4 ]
+        let mut header = [0; 8];
+        match stream.read_exact(&mut header) {
+            Ok(_) => {
+                let payload_size: Vec<u8> = header[4..8].to_vec();
+                let mut buffer = vec![
+                    0;
+                    Cursor::new(&payload_size).read_u32::<BigEndian>().unwrap()
+                        as usize
+                ];
+                match stream.read_exact(&mut buffer) {
+                    Ok(_) => {
+                        match header[0] {
+                            // stdin, unhandled
+                            0 => break,
+                            // stdout
+                            1 => lines.push(TtyLine::StdOut(
+                                String::from_utf8_lossy(&buffer).trim().to_string(),
+                            )),
+                            // stderr
+                            2 => lines.push(TtyLine::StdErr(
+                                String::from_utf8_lossy(&buffer).trim().to_string(),
+                            )),
+                            //unhandled
+                            _ => break,
+                        }
+                    }
+                    Err(_) => break,
+                };
+            }
+            Err(_) => break,
         }
     }
+    lines
 }
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