File streaming excercise.

exercises/menu.json

@@ -1,10 +1,11 @@
 [
- "HELLO_KOA",
- "ROUTING",
- "REQUEST_BODY",
- "RESPONSE_BODY",
- "MIDDLEWARE",
- "ERROR_HANDLING",
- "COOKIE",
- "TEMPLATING"
+ "HELLO_KOA",
+ "ROUTING",
+ "REQUEST_BODY",
+ "RESPONSE_BODY",
+ "MIDDLEWARE",
+ "ERROR_HANDLING",
+ "COOKIE",
+ "TEMPLATING",
+ "STREAM_FILE"
 ]

exercises/stream_file/exercise.js

@@ -0,0 +1,6 @@
+
+var exercise = require('../../exercise');
+
+module.exports = exercise.push('/hello', function (data, res, stream) {
+ stream.write(data.toString() + '\n');
+}).generate();

exercises/stream_file/problem.md

@@ -0,0 +1,19 @@
+Create a koa server that listens on a port passed from the command line and replies with contents of the requested file when an HTTP GET request is sent to `/<file_name>`
+
+P.S: The fun part is, it shall be using a Stream here ;)
+
+HINTS:
+
+* Create a file named `hello` in the same dir where the `program.js` is present and contents of it being `Hello from Koa!`
+
+* When request for `/hello` the server must responsed with the contents of the file `hello`
+
+* When request for something else either than `/hello` it must responsed saying `File not Found.` ( As expected. )
+
+* The path to the file will be `path = __dirname + this.path;`
+
+* You can use `fs` module to check if the file is present or not and set the body to `fs.createReadStream(path)`. 
+
+So, what are you waiting for? 
+
+Go ahead and code, good luck!

exercises/stream_file/solution/hello

@@ -0,0 +1 @@
+Hello from Koa!

exercises/stream_file/solution/solution.js

@@ -0,0 +1,20 @@
+var koa = require('koa');
+var fs = require('fs');
+var app = module.exports = koa();
+var path = require('path');
+var extname = path.extname;
+
+// try GET /app.js
+
+app.use(function * () {
+ var path = __dirname + this.path;
+ if (fs.lstatSync(path).isFile()) {
+ this.type = extname(path);
+ this.body = fs.createReadStream(path);
+ } else {
+ this.satus = 404;
+ this.body = "File not found.";
+ }
+});
+
+app.listen(process.argv[2]);