Fix some logic and control flow issues

backend/k8s.js

@@ -284,7 +284,7 @@ export async function initUserSession({ watcher, podName, proxyInfo }) {
           }
         }
         resolve({
-          exec: (cmdline, { on, pty }) => {
+          exec: async (cmdline, { on, pty }) => {
             // on :: { stdout, stderr, exit, error, close }
             if (pty) {
               cmdline = ["/riju-bin/ptyify", ...cmdline];
@@ -312,6 +312,10 @@ export async function initUserSession({ watcher, podName, proxyInfo }) {
                 }
               );
             }
+            await new Promise((resolve, reject) => {
+              conn.on("open", resolve);
+              conn.on("error", reject);
+            });
             conn.on("message", (msg) => {
               let event, data, text, exitStatus;
               try {
@@ -352,7 +356,7 @@ export async function initUserSession({ watcher, podName, proxyInfo }) {
             return {
               stdin: {
                 write: (data) =>
-                  conn.write(JSON.stringify({ event: "stdin", data })),
+                  conn.send(JSON.stringify({ event: "stdin", data })),
               },
             };
           },

backend/sandbox-k8s.js

@@ -57,8 +57,8 @@ async function main() {
     handlePtyInput: (data) => handlePtyInput(data),
     handlePtyExit: (_status) => {},
   });
-  await new Promise((resolve) => {
+  await new Promise(async (resolve) => {
-    const exec = session.exec(["bash"], {
+    const exec = await session.exec(["bash"], {
       pty: true,
       on: {
         stdout: (data) => pty.handlePtyOutput(data),

backend/util.js

@@ -2,7 +2,6 @@ import { spawn } from "child_process";
 import { promises as fs } from "fs";
 import process from "process";
 
-import TailFile from "@logdna/tail-file";
 import * as Sentry from "@sentry/node";
 import * as tmp from "tmp-promise";
 import { v4 as getUUIDOrig } from "uuid";
@@ -188,25 +187,40 @@ export function deptyify({ handlePtyInput, handlePtyExit }) {
               }
             });
           });
-          const input = new TailFile(`${dir.path}/input`, {
-            encoding: "utf-8",
-          });
-          input.on("data", (data) => handlePtyInput(data));
-          input.on("tail_error", logError);
-          input.on("error", logError);
-          await input.start();
-          const output = await fs.open(`${dir.path}/output`, "w");
           const proc = spawn(
-            "system/out/riju-pty",
+            `${process.cwd()}/system/out/riju-pty`,
             ["-f", "sh", "-c", "cat > input & cat output"],
             {
               cwd: dir.path,
+              stdio: "inherit",
             }
           );
+          await new Promise((resolve, reject) => {
+            proc.on("spawn", resolve);
+            proc.on("error", reject);
+          });
           proc.on("exit", (status) => {
             handlePtyExit(status);
             triggerDone();
           });
+          const [input, output] = await new Promise((resolve, reject) => {
+            setTimeout(() => reject("timed out"), 5000);
+            resolve(
+              Promise.all([
+                fs.open(`${dir.path}/input`, "r"),
+                fs.open(`${dir.path}/output`, "w"),
+              ])
+            );
+          });
+          setTimeout(async () => {
+            try {
+              while (true) {
+                handlePtyInput(await input.read({ encoding: "utf-8" }));
+              }
+            } catch (err) {
+              logError(err);
+            }
+          }, 0);
           resolve({
             handlePtyOutput: async (data) => {
               await output.write(data);

package.json

@@ -10,7 +10,6 @@
     "@babel/preset-env": "^7.12.11",
     "@balena/dockerignore": "^1.0.2",
     "@kubernetes/client-node": "^0.18.0",
-    "@logdna/tail-file": "^3.0.0",
     "@sentry/node": "^6.11.0",
     "async-lock": "^1.2.6",
     "babel-loader": "^8.2.2",

yarn.lock

@@ -904,11 +904,6 @@
   optionalDependencies:
     openid-client "^5.3.0"
 
-"@logdna/tail-file@^3.0.0":
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/@logdna/tail-file/-/tail-file-3.0.0.tgz#0120353e59bf04b318d4861684e95682b0e85071"
-  integrity sha512-aZy8XzJI9zwl7gbmQa1L5Hr6yJbS062OMQJ7I9sqHD/QMEBfwlhxyytJ4Qe2jAoimefuabopEi4Gk+t/7to6/A==
-
 "@sentry/core@6.11.0":
   version "6.11.0"
   resolved "https://registry.yarnpkg.com/@sentry/core/-/core-6.11.0.tgz#40e94043afcf6407a109be26655c77832c64e740"