Initial commit

node_modules/knex/scripts/stress-test/mysql2-sudden-exit-without-error.js

@@ -0,0 +1,101 @@
+/**
+ * Test case when mysql2 driver strangely exits when one tries to send query
+ * to dead connection.
+ */
+
+const delay = require('../../lib/execution/internal/delay');
+const toxiproxy = require('toxiproxy-node-client');
+const toxicli = new toxiproxy.Toxiproxy('http://localhost:8474');
+const rp = require('request-promise-native');
+
+// drops old toxicproxy and creates new
+async function recreateProxy(serviceName, listenPort, proxyToPort) {
+  try {
+    await rp.delete({
+      url: `${toxicli.host}/proxies/${serviceName}`,
+    });
+  } catch (err) {
+    // there was no proxy by that name... its ok
+  }
+
+  await toxicli.createProxy({
+    name: serviceName,
+    listen: `0.0.0.0:${listenPort}`,
+    upstream: `${serviceName}:${proxyToPort}`,
+  });
+}
+
+async function insanelyParanoidQuery(con) {
+  console.log('sending query');
+  const res = await new Promise((resolve, reject) => {
+    try {
+      con.query('select 1', [], function (err, rows, fields) {
+        if (err) {
+          reject(err);
+        } else {
+          resolve(rows);
+        }
+      });
+    } catch (err) {
+      console.log('Huh synchronous exception?! (shouldnt be possible)');
+      reject(err);
+    }
+  });
+  console.log(res);
+}
+
+async function main() {
+  // create proxy from localhost:23306 -> mysqldocker:3306
+  await recreateProxy('mysql', 23306, 3306);
+
+  // ------------- setup mysql2 db driver connection
+  const mysql2 = require('mysql2'); // with mysql this works...
+  const mysql2Con = await mysql2.createConnection({
+    host: 'localhost',
+    user: 'root',
+    password: 'mysqlrootpassword',
+    port: 23306,
+  });
+
+  mysql2Con.on('error', function (err) {
+    console.log("I'm dead", err);
+  });
+
+  console.log('Going to cut connections');
+
+  // cut connection during recreate
+  await recreateProxy('mysql', 23306, 3306);
+
+  console.log('Proxy recreated... start waiting');
+
+  // wait forever
+  // eslint-disable-next-line no-constant-condition
+  while (true) {
+    await delay(1000);
+    try {
+      await insanelyParanoidQuery(mysql2Con);
+    } catch (err) {
+      console.log('query failed:', err);
+    }
+    await recreateProxy('mysql', 23306, 3306);
+  }
+}
+
+main()
+  .then(() => console.log('Process stopped normally'))
+  .catch((err) => {
+    console.log('Process stopped to failure', err);
+  });
+
+console.log('Waiting for eventloop to stop...');
+
+process.on('uncaughtException', function (err) {
+  console.log('uncaughtException', err);
+});
+
+process.on('exit', function () {
+  console.log(
+    'Did someone call process.exit() or wat? exitCode:',
+    process.exitCode
+  );
+});