server : (webui) revamp Settings dialog, add Pyodide interpreter (#11759)

* redo Settings modal UI

* add python code interpreter

* fix auto scroll

* build

* fix overflow for long output lines

* bring back sticky copy button

* adapt layout on mobile view

* fix multiple lines output and color scheme

* handle python exception

* better state management

* add webworker

* add headers

* format code

* speed up by loading pyodide on page load

* (small tweak) add small animation to make it feels like claude

examples/server/webui/src/components/CanvasPyInterpreter.tsx

@@ -0,0 +1,195 @@
+import { useEffect, useState } from 'react';
+import { useAppContext } from '../utils/app.context';
+import { OpenInNewTab, XCloseButton } from '../utils/common';
+import { CanvasType } from '../utils/types';
+import { PlayIcon, StopIcon } from '@heroicons/react/24/outline';
+import StorageUtils from '../utils/storage';
+
+const canInterrupt = typeof SharedArrayBuffer === 'function';
+
+// adapted from https://pyodide.org/en/stable/usage/webworker.html
+const WORKER_CODE = `
+importScripts("https://cdn.jsdelivr.net/pyodide/v0.27.2/full/pyodide.js");
+
+let stdOutAndErr = [];
+
+let pyodideReadyPromise = loadPyodide({
+  stdout: (data) => stdOutAndErr.push(data),
+  stderr: (data) => stdOutAndErr.push(data),
+});
+
+let alreadySetBuff = false;
+
+self.onmessage = async (event) => {
+  stdOutAndErr = [];
+
+  // make sure loading is done
+  const pyodide = await pyodideReadyPromise;
+  const { id, python, context, interruptBuffer } = event.data;
+
+  if (interruptBuffer && !alreadySetBuff) {
+    pyodide.setInterruptBuffer(interruptBuffer);
+    alreadySetBuff = true;
+  }
+
+  // Now load any packages we need, run the code, and send the result back.
+  await pyodide.loadPackagesFromImports(python);
+
+  // make a Python dictionary with the data from content
+  const dict = pyodide.globals.get("dict");
+  const globals = dict(Object.entries(context));
+  try {
+    self.postMessage({ id, running: true });
+    // Execute the python code in this context
+    const result = pyodide.runPython(python, { globals });
+    self.postMessage({ result, id, stdOutAndErr });
+  } catch (error) {
+    self.postMessage({ error: error.message, id });
+  }
+  interruptBuffer[0] = 0;
+};
+`;
+
+let worker: Worker;
+const interruptBuffer = canInterrupt
+  ? new Uint8Array(new SharedArrayBuffer(1))
+  : null;
+
+const startWorker = () => {
+  if (!worker) {
+    worker = new Worker(
+      URL.createObjectURL(new Blob([WORKER_CODE], { type: 'text/javascript' }))
+    );
+  }
+};
+
+if (StorageUtils.getConfig().pyIntepreterEnabled) {
+  startWorker();
+}
+
+const runCodeInWorker = (
+  pyCode: string,
+  callbackRunning: () => void
+): {
+  donePromise: Promise<string>;
+  interrupt: () => void;
+} => {
+  startWorker();
+  const id = Math.random() * 1e8;
+  const context = {};
+  if (interruptBuffer) {
+    interruptBuffer[0] = 0;
+  }
+
+  const donePromise = new Promise<string>((resolve) => {
+    worker.onmessage = (event) => {
+      const { error, stdOutAndErr, running } = event.data;
+      if (id !== event.data.id) return;
+      if (running) {
+        callbackRunning();
+        return;
+      } else if (error) {
+        resolve(error.toString());
+      } else {
+        resolve(stdOutAndErr.join('\n'));
+      }
+    };
+    worker.postMessage({ id, python: pyCode, context, interruptBuffer });
+  });
+
+  const interrupt = () => {
+    console.log('Interrupting...');
+    console.trace();
+    if (interruptBuffer) {
+      interruptBuffer[0] = 2;
+    }
+  };
+
+  return { donePromise, interrupt };
+};
+
+export default function CanvasPyInterpreter() {
+  const { canvasData, setCanvasData } = useAppContext();
+
+  const [code, setCode] = useState(canvasData?.content ?? ''); // copy to avoid direct mutation
+  const [running, setRunning] = useState(false);
+  const [output, setOutput] = useState('');
+  const [interruptFn, setInterruptFn] = useState<() => void>();
+  const [showStopBtn, setShowStopBtn] = useState(false);
+
+  const runCode = async (pycode: string) => {
+    interruptFn?.();
+    setRunning(true);
+    setOutput('Loading Pyodide...');
+    const { donePromise, interrupt } = runCodeInWorker(pycode, () => {
+      setOutput('Running...');
+      setShowStopBtn(canInterrupt);
+    });
+    setInterruptFn(() => interrupt);
+    const out = await donePromise;
+    setOutput(out);
+    setRunning(false);
+    setShowStopBtn(false);
+  };
+
+  // run code on mount
+  useEffect(() => {
+    setCode(canvasData?.content ?? '');
+    runCode(canvasData?.content ?? '');
+    // eslint-disable-next-line react-hooks/exhaustive-deps
+  }, [canvasData?.content]);
+
+  if (canvasData?.type !== CanvasType.PY_INTERPRETER) {
+    return null;
+  }
+
+  return (
+    <div className="card bg-base-200 w-full h-full shadow-xl">
+      <div className="card-body">
+        <div className="flex justify-between items-center mb-4">
+          <span className="text-lg font-bold">Python Interpreter</span>
+          <XCloseButton
+            className="bg-base-100"
+            onClick={() => setCanvasData(null)}
+          />
+        </div>
+        <div className="grid grid-rows-3 gap-4 h-full">
+          <textarea
+            className="textarea textarea-bordered w-full h-full font-mono"
+            value={code}
+            onChange={(e) => setCode(e.target.value)}
+          ></textarea>
+          <div className="font-mono flex flex-col row-span-2">
+            <div className="flex items-center mb-2">
+              <button
+                className="btn btn-sm bg-base-100"
+                onClick={() => runCode(code)}
+                disabled={running}
+              >
+                <PlayIcon className="h-6 w-6" /> Run
+              </button>
+              {showStopBtn && (
+                <button
+                  className="btn btn-sm bg-base-100 ml-2"
+                  onClick={() => interruptFn?.()}
+                >
+                  <StopIcon className="h-6 w-6" /> Stop
+                </button>
+              )}
+              <span className="grow text-right text-xs">
+                <OpenInNewTab href="https://github.com/ggerganov/llama.cpp/issues/11762">
+                  Report a bug
+                </OpenInNewTab>
+              </span>
+            </div>
+            <textarea
+              className="textarea textarea-bordered h-full dark-color"
+              value={output}
+              readOnly
+            ></textarea>
+          </div>
+        </div>
+      </div>
+    </div>
+  );
+}