create individual workdir for kernel and initialize a dedicated virtual env

TODO: file up- and download does not work yet due to the 'workspace' dir not being mapped correctly

Author: dasmy

.gitignore

@@ -4,6 +4,7 @@
 
 # Program related
 process_pids/
+kernel.*
 kernel_connection_file.json
 
 # Python stuff

frontend/src/App.tsx

@@ -53,7 +53,7 @@ function App() {
     ])
   );
   let [waitingForSystem, setWaitingForSystem] = useState<WaitingStates>(
-    WaitingStates.Idle
+    WaitingStates.StartingKernel
   );
   const chatScrollRef = React.useRef<HTMLDivElement>(null);
 
@@ -77,11 +77,8 @@ function App() {
 
   const handleCommand = (command: string) => {
     if (command == "reset") {
-      addMessage({
-        text: "Restarting the kernel.",
-        type: "message",
-        role: "system",
-      });
+      addMessage({text: "Restarting the kernel.", type: "message", role: "system"});
+      setWaitingForSystem(WaitingStates.StartingKernel);
 
       fetch(`${Config.API_ADDRESS}/restart`, {
         method: "POST",

frontend/src/components/Chat.tsx

@@ -75,6 +75,7 @@ function Message(props: {
 
 
 export enum WaitingStates {
+  StartingKernel = "Starting Kernel",
   GeneratingCode = "Generating code",
   RunningCode = "Running code",
   UploadingFile = "Uploading file",

gpt_code_ui/kernel_program/kernel_manager.py

@@ -1,6 +1,8 @@
 import sys
 import subprocess
 import os
+import shutil
+import atexit
 import queue
 import json
 import signal
@@ -167,30 +169,53 @@ def flush_kernel_msgs(kc, tries=1, timeout=0.2):
         logger.debug(f"{e} [{type(e)}")
 
 
-def start_kernel():
-    kernel_connection_file = os.path.join(os.getcwd(), "kernel_connection_file.json")
-
-    if os.path.isfile(kernel_connection_file):
-        os.remove(kernel_connection_file)
-    if os.path.isdir(kernel_connection_file):
-        os.rmdir(kernel_connection_file)
-
-    launch_kernel_script_path = os.path.join(
-        pathlib.Path(__file__).parent.resolve(), "launch_kernel.py"
-    )
-
-    os.makedirs('workspace/', exist_ok=True)
-
+def start_kernel(id: str):
+    cwd = pathlib.Path(os.getcwd())
+    kernel_dir = cwd / f'kernel.{id}'
+    kernel_venv = kernel_dir / 'venv'
+    kernel_venv_bindir = kernel_venv / 'bin'
+    kernel_python_executable = kernel_venv_bindir / os.path.basename(sys.executable)
+    kernel_connection_file = kernel_dir / "kernel_connection_file.json"
+    launch_kernel_script_path = pathlib.Path(__file__).parent.resolve() / "launch_kernel.py"
+    kernel_env = os.environ.copy()
+    kernel_env['PATH'] = str(kernel_venv_bindir) + os.pathsep + kernel_env['PATH']
+
+    # Cleanup potential leftovers
+    shutil.rmtree(kernel_dir, ignore_errors=True)
+
+    os.makedirs(kernel_dir)
+
+    # create virtual env inside kernel_venv directory
+    subprocess.run([sys.executable, '-m', 'venv', kernel_venv, '--upgrade-deps', '--system-site-packages'])
+    # install wheel because some packages do not like being installed without
+    subprocess.run([kernel_python_executable, '-m', 'pip', 'install', 'wheel>=0.41,<1.0'])
+    # install all default packages into the venv
+    default_packages = [
+        "ipykernel>=6,<7",
+        "numpy>=1.24,<1.25",
+        "dateparser>=1.1,<1.2",
+        "pandas>=1.5,<1.6",
+        "geopandas>=0.13,<0.14",
+        "tabulate>=0.9.0<1.0",
+        "PyPDF2>=3.0,<3.1",
+        "pdfminer>=20191125,<20191200",
+        "pdfplumber>=0.9,<0.10",
+        "matplotlib>=3.7,<3.8",
+    ]
+    subprocess.run([kernel_python_executable, '-m', 'pip', 'install'] + default_packages)
+
+    # start the kernel using the virtual env python executable
     kernel_process = subprocess.Popen(
         [
-            sys.executable,
+            kernel_python_executable,
             launch_kernel_script_path,
             "--IPKernelApp.connection_file",
             kernel_connection_file,
             "--matplotlib=inline",
             "--quiet",
         ],
-        cwd='workspace/'
+        cwd=kernel_dir,
+        env=kernel_env,
     )
     # Write PID for caller to kill
     str_kernel_pid = str(kernel_process.pid)
@@ -200,25 +225,28 @@ def start_kernel():
 
     # Wait for kernel connection file to be written
     while True:
-        if not os.path.isfile(kernel_connection_file):
+        try:
+            with open(kernel_connection_file, 'r') as fp:
+                json.load(fp)
+        except (FileNotFoundError, json.JSONDecodeError):
+            # Either file was not yet there or incomplete (then JSON parsing failed)
             sleep(0.1)
+            pass
         else:
-            # Keep looping if JSON parsing fails, file may be partially written
-            try:
-                with open(kernel_connection_file, 'r') as fp:
-                    json.load(fp)
-                break
-            except json.JSONDecodeError:
-                pass
+            break
 
     # Client
-    kc = BlockingKernelClient(connection_file=kernel_connection_file)
+    kc = BlockingKernelClient(connection_file=str(kernel_connection_file))
     kc.load_connection_file()
     kc.start_channels()
     kc.wait_for_ready()
-    return kc
+    return kc, kernel_dir
 
 
 if __name__ == "__main__":
-    kc = start_kernel()
-    start_snakemq(kc)
+    kc, kernel_dir = start_kernel(id='ffa907c8-1908-49e3-974b-c0c27cbac6e4')  # This is just a random but fixed ID for now - to be prepared for later multi-kernel scenarios
+
+    # make sure the dir with the virtualenv will be deleted after kernel termination
+    atexit.register(lambda: shutil.rmtree(kernel_dir, ignore_errors=True))
+
+    start_snakemq(kc)