feat: MySQL Tracing Support

[kamilogorek]

MySQL and MariaDB tracing support.

Usage:

const Sentry = require("@sentry/node");
const Tracing = require("@sentry/tracing");
const mysql = require("mysql");

Sentry.init({
  dsn: "__PUBLIC_DSN__",
  integrations: [
    new Tracing.Integrations.Mysql(),
  ],
  tracesSampleRate: 1.0,
});

const connection = mysql.createConnection({
  user: "root",
  password: "docker",
});

connection.connect(function (err) {
  if (err) {
    console.error("error connecting: " + err.stack);
    return;
  }
  console.log("connected as id " + connection.threadId);
});

// the rest of the code, for raw-node code we need manual instrumentation, eg.

const transaction = Sentry.startTransaction({
  op: "transaction",
  name: "My Transaction",
});

Sentry.configureScope((scope) => {
  scope.setSpan(transaction);
});

connection.query("SELECT 1 + 1 AS solution", function (error, results, fields) {
  console.log(err ? err.stack : results[0].solution); // 2
  if (transaction) transaction.finish();
  connection.end();
});

Works nicely with Express too:

const Sentry = require("@sentry/node");
const Tracing = require("@sentry/tracing");
const mysql = require("mysql");
const express = require("express");

Sentry.init({
  dsn: "__PUBLIC_DSN__",
  integrations: [
    new Sentry.Integrations.Http({ tracing: true }),
    new Tracing.Integrations.Express({
      app: express.Router,
      methods: ["get"],
    }),
    new Tracing.Integrations.Mysql(),
  ],
  tracesSampleRate: 1.0,
});

const app = express();
const connection = mysql.createConnection({
  user: "root",
  password: "docker",
});

connection.connect();

app.use(Sentry.Handlers.requestHandler());
app.use(Sentry.Handlers.tracingHandler());
app.use(express.json());

app.get("/hi", function sayHi(req, res) {
  connection.query("SELECT 1 + 1 AS solution", function (error, results, fields) {
    res.send(results[0].solution);
  });
});

app.use(Sentry.Handlers.errorHandler());

app.listen(3000);

[github-actions]

size-limit report

Path	Size
@sentry/browser - CDN Bundle (gzipped)	19.73 KB (-0.01% 🔽)
@sentry/browser - Webpack	20.6 KB (0%)
@sentry/react - Webpack	20.6 KB (0%)
@sentry/browser + @sentry/tracing - CDN Bundle (gzipped)	26.88 KB (-0.01% 🔽)

[lobsterkatie]

One small nit, but otherwise LGTM!

P.S. Any possibility of adding some tests?