Add server files for Connect examples

One of the reviewers found the examples were not easy to run without
suitable server files, so I've added them to the first four samples

ch07-connect-and-express/hello-world/package.json

@@ -2,7 +2,7 @@
   "name": "ch07-connect-and-express",
   "version": "1.0.0",
   "description": "",
-  "main": "index.js",
+  "main": "server.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
   },

ch07-connect-and-express/listing7_1/package.json

@@ -2,7 +2,7 @@
   "name": "listing7_1",
   "version": "1.0.0",
   "description": "",
-  "main": "index.js",
+  "main": "server.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
   },

ch07-connect-and-express/listing7_1/index.js → ch07-connect-and-express/listing7_1/server.js

@@ -1,14 +1,16 @@
 const connect = require('connect');
+
 function logger(req, res, next) {
   console.log('%s %s', req.method, req.url);
   next();
 }
+
 function hello(req, res) {
   res.setHeader('Content-Type', 'text/plain');
   res.end('hello world');
 }
+
 connect()
   .use(logger)
   .use(hello)
-  .listen(3000);
-
+  .listen(3000);

ch07-connect-and-express/listing7_2/package.json

@@ -2,7 +2,7 @@
   "name": "listing7_2",
   "version": "1.0.0",
   "description": "",
-  "main": "index.js",
+  "main": "server.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
   },

ch07-connect-and-express/listing7_3/server.js

@@ -0,0 +1,12 @@
+const connect = require('connect');
+const setup = require('./logger.js')
+
+function hello(req, res) {
+  res.setHeader('Content-Type', 'text/plain');
+  res.end('hello world');
+}
+
+const app = connect()
+  .use(setup(':method :url'))
+  .use(hello)
+  .listen(3000);

ch07-connect-and-express/listing7_4/errors.js

@@ -1,18 +1,16 @@
-var env = process.env.NODE_ENV || 'development';
+const env = process.env.NODE_ENV || 'development';
 
-function errorHandler() {
-  return function(err, req, res, next) {
-    res.statusCode = 500;
-    switch (env) {
-      case 'development':
-        console.error('Error:');
-        console.error(err);
-        res.setHeader('Content-Type', 'application/json');
-        res.end(JSON.stringify(err));
-        break;
-      default:
-        res.end('Server error');
-    }
+function errorHandler(err, req, res, next) {
+  res.statusCode = 500;
+  switch (env) {
+    case 'development':
+      console.error('Error caught by errorHandler:');
+      console.error(err);
+      res.setHeader('Content-Type', 'application/json');
+      res.end(JSON.stringify(err));
+      break;
+    default:
+      res.end('Server error');
   }
 }
 

ch07-connect-and-express/listing7_4/logger.js

@@ -0,0 +1,14 @@
+function setup(format) {
+  const regexp = /:(\w+)/g;
+
+  return function createLogger(req, res, next) {
+    const str = format.replace(regexp, (match, property) => {
+      return req[property];
+    });
+
+    console.log(str);
+    next();
+  }
+}
+
+module.exports = setup;

ch07-connect-and-express/listing7_4/package.json

@@ -2,7 +2,7 @@
   "name": "listing7_4",
   "version": "1.0.0",
   "description": "",
-  "main": "index.js",
+  "main": "server.js",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
   },

ch07-connect-and-express/listing7_4/server.js

@@ -0,0 +1,14 @@
+const connect = require('connect');
+const setup = require('./logger.js');
+const errorHandler = require('./errors.js');
+
+function hello(req, res, next) {
+  res.setHeader('Content-Type', 'text/plain');
+  next(new Error('Intentional error'));
+}
+
+const app = connect()
+  .use(setup(':method :url'))
+  .use(hello)
+  .use(errorHandler)
+  .listen(3000);