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update markdown style in README for extra code on mongo logger middleware
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‎Lesson04/mongo_logger_middleware/README.md‎

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@@ -7,86 +7,85 @@ Install mongodb community and ensure it is running, using the latest instruction
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Install `mongodb` node.js driver, which is a node package to work with mongodb, this program is different from the database itself. It should be installed with the save option:
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npm install -s mongodb
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npm install -s mongodb
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Import the mongodb library to `server.js`, and create a variable with our DB url:
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// Import MongoDb driver
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const MongoClient = require('mongodb').MongoClient;
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const dbUrl = "mongodb://localhost:27017/";
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// Import MongoDb driver
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const MongoClient = require('mongodb').MongoClient;
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const dbUrl = "mongodb://localhost:27017/";
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Write a database logger middleware function that creates an event info object and inserts it into an events collection:
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// Record all events and requests to the server in database here
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var dbLogger = function (req, res, next) {
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// Create an object to gather data we want to save
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let info = {};
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// Add route path of request to object
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info.path = req.path;
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// Add timestamp to info object
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info.timestamp = Date.now();
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// Add authorization header so we can see associated user
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info.token = req.headers.authorization;
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// Add the method and body of the request
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info.method = req.method;
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info.body = req.body;
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console.log(info);
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// Open a database connection
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MongoClient.connect(dbUrl, { useNewUrlParser: true }, function(err, db) {
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if (err) {
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console.log(err);
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return;
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// Record all events and requests to the server in database here
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var dbLogger = function (req, res, next) {
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// Create an object to gather data we want to save
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let info = {};
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// Add route path of request to object
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info.path = req.path;
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// Add timestamp to info object
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info.timestamp = Date.now();
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// Add authorization header so we can see associated user
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info.token = req.headers.authorization;
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// Add the method and body of the request
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info.method = req.method;
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info.body = req.body;
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console.log(info);
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// Open a database connection
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MongoClient.connect(dbUrl, { useNewUrlParser: true }, function(err, db) {
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if (err) {
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console.log(err);
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return;
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}
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var dbo = db.db("mydb");
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// Insert our event info object into the events collection
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dbo.collection("events").insertOne(info, function(err, res) {
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if (err) console.log(err);
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db.close();
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});
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});
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// Middleware function done running, move to the next function
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next();
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}
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var dbo = db.db("mydb");
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// Insert our event info object into the events collection
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dbo.collection("events").insertOne(info, function(err, res) {
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if (err) console.log(err);
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db.close();
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});
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});
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// Middleware function done running, move to the next function
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next();
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}
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// These two lines from an earlier step need to be run before we use `dbLogger`
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app.use(express.urlencoded({extended: true}));
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app.use(express.json());
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// Tell our app to user the database logger for all requests
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app.use(dbLogger);
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// These two lines from an earlier step need to be run before we use `dbLogger`
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app.use(express.urlencoded({extended: true}));
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app.use(express.json());
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// Tell our app to user the database logger for all requests
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app.use(dbLogger);
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Making sure mongodb is running on your machine, run the program:
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npm start
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npm start
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In another window run a `curl` command to any endpoint, we’ll use `check-in`:
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curl -sd "name=john" -X POST http://localhost:3000/check-in | jq -r ".token"
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curl -sd "name=john" -X POST http://localhost:3000/check-in | jq -r ".token"
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After running a `curl` command like above we should see our event info object logged to the console running our application.
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Next we’ll confirm that our info object saved to the database by opening it from the command line and viewing the collections. Open a terminal and run the following:
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mongo mongodb://localhost:27017/
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mongo mongodb://localhost:27017/
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This should open up the mongodb command line shell.
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With the mongodb shell open we can run `show dbs` to list all of our local databases. The list should include the name “mydb” used in the line from our logging function:
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show dbs
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show dbs
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Assuming you see “mydb” we can open the database with:
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use mydb
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use mydb
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Now that we’re using “mydb” we can look at the collections it contains. The list should include the name “events” used in our logging function:
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show collections
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show collections
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If the above command shows the “events” collection we can make a query to view all the entries:
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db.events.find()
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db.events.find()
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The response should include a JSON object for each request that was made after our `dbLogger` was enabled.
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