Merge pull request #1 from makebrainwaves/dano-pyodide-install

Automatic pyodide installation

internals/scripts/InstallPyodide.js

@@ -0,0 +1,66 @@
+// mkdir app/utils/pyodide/src
+// && cd app/utils/pyodide/src
+// curl -LJO https://github.com/iodide-project/pyodide/releases/download/0.12.0/pyodide-build-0.12.0.tar.bz2
+// tar xjf pyodide-build-0.12.0.tar.bz2
+// rm pyodide-build-0.12.0.tar.bz2",
+
+import chalk from 'chalk';
+import fs from 'fs';
+import https from 'https';
+import mkdirp from 'mkdirp';
+import tar from 'tar-fs';
+import url from 'url';
+import bz2 from 'unbzip2-stream';
+
+const PYODIDE_VERSION = '0.12.0';
+const TAR_NAME = `pyodide-build-${PYODIDE_VERSION}.tar.bz2`;
+const TAR_URL = `https://github.com/iodide-project/pyodide/releases/download/${PYODIDE_VERSION}/pyodide-build-${PYODIDE_VERSION}.tar.bz2`;
+const PYODIDE_DIR = 'app/utils/pyodide/src/';
+
+const writeAndUnzipFile = response => {
+  const filePath = `${PYODIDE_DIR}${TAR_NAME}`;
+  const writeStream = fs.createWriteStream(filePath);
+  response.pipe(writeStream);
+
+  writeStream.on('finish', () => {
+    console.log(`${chalk.green.bold(`Unzipping pyodide`)}`);
+
+    const readStream = fs.createReadStream(filePath);
+    try {
+      readStream.pipe(bz2()).pipe(tar.extract(PYODIDE_DIR));
+    } catch (e) {
+      throw new Error('Error in unzip:', e);
+    }
+
+    readStream.on('end', () => {
+      console.log(`${chalk.green.bold(`Unzip successful`)}`);
+    });
+  });
+};
+
+const downloadFile = response => {
+  if (
+    response.statusCode > 300 &&
+    response.statusCode < 400 &&
+    response.headers.location
+  ) {
+    if (url.parse(response.headers.location).hostname) {
+      https.get(response.headers.location, writeAndUnzipFile);
+    } else {
+      https.get(
+        url.resolve(url.parse(TAR_URL).hostname, response.headers.location),
+        writeAndUnzipFile
+      );
+    }
+  } else {
+    writeAndUnzipFile(response);
+  }
+};
+
+(() => {
+  console.log(
+    `${chalk.green.bold(`Downloading pyodide ${PYODIDE_VERSION}...`)}`
+  );
+  mkdirp.sync(`app/utils/pyodide/src`);
+  https.get(TAR_URL, downloadFile);
+})();