Homework 2 – Bulletin Board System: Part 2 Solution

Description

Description

Continuing the first part, you are asking to implement the functions of the Bulletin Board System (BBS) server.

Requirement

The service accepts the following commands and at least 10 clients:

When client enter command incompletely E.g., missing parameters, the server should show command format for client.

Command format	Description			Result
create-board <name>	Create a board which named <name>.	Success		Create board successfully.
	<name> must be unique.
	If Board’s name is already used, show failed
		Fail (1)		Board already exist.
	message, otherwise it is success.
	Must be logged in when creating board’s
		Fail (2)		Please login first.
	name
create-post <board-name> –title <title>	Create a post which title is <title> and content	Success		Create post successfully.
–content <content>	is <content>.
(command is in the same line )	Use –title and –content to separate titles and
		Fail (1)		Board does not exist.
	content.
	<tilte> can have space but only in one line.
		Fail (2)		Please login first.
	<content> can have space, and key in <br> to
	indicate a new line.
list-board ##<key>	List all boards in BBS.	Index	Name		Moderator
	<key> is a keyword, use ## <key> to do	<Index1> <Name1> <Moderator1>
	advanced query.
list-post <board-name> ##<key>	List all posts in a board named <board-name>	Success
	<key> is a keyword, use ## <key> to do
		ID	Title		Author	Date
	advanced query.
		<ID1>	<Title1>		<Author1>	<Date1>
		Fail		Board does not exist.
read <post-id>	Show the post which ID is <post-id>.	Success		Author	:<Author1>
				Title	:<Title1>
				Date	:<Date1>
				—
				<content>
				—
				<User1> : <Comment1>
		Fail		Post does not exist.
delete-post <post-id>	Delete the post which ID is <post-id>.	Success		Delete successfully.
	Only the post owner can delete the post.
		Fail (1)		Please login first.
	If the user is not the post owner, show failed
	message, otherwise it is success.
		Fail (2)		Post does not exist.
		Fail (3)		Not the post owner.

update-post <post-id> –title/content	Update the post which ID is <post-id>.	Success	Update successfully.
<new>	Use — to decide which to modify, title or
		Fail (1)	Please login first.
	content, and replaced by <new>.
	Only the post owner can update the post.
		Fail (2)	Post does not exist.
	If the user is not the post owner, show failed
	message, otherwise it is success.
		Fail (3)	Not the post owner.
comment <post-id> <comment>	Leave a comment < comment > at the post	Success	Comment successfully.
	which ID is <post-id>
		Fail (1)	Please login first.
		Fail (2)	Post does not exist.

• create-post NCTU –title About NP HW_2 –content Help!<br>I have some problem! Board does not exist.

• create-post NP_HW –title About NP HW_2 –content Help!<br>I have some problem! Create post successfully.

• create-post NP_HW –title HW_3 –content Ask!<br>Is NP HW_3 Released?

• list-post NP

• list-post NP_HW

• list-post NP_HW ##HW_2

• read 888

% read 1

Author :Bob

Title :About NP HW_2

Date :2020-03-31

—

Help!

—

• update-post 888 –title NP HW_2 Post does not exist.

• update-post 1 –title NP HW_2 Update successfully.

• read 1

Author :Bob

Title :NP HW_2

Date :2020-03-31

—

—

• logout Bye, Bob.

• login Sam 654321 Welcome, Sam.

• update-post 1 –content Ha!<br>ha!<br>ha! Not the post owner.

• delete-post 1

• comment 888 Ha! ha! ha! Post does not exist.

• comment 1 Ha! ha! ha! Comment successfully.

• read 1

—

—

• create-board Hello Create board successfully.

• list-board

Index	Name	Moderator
1	NP_HW	Bob
2	OS_HW	Bob
3	FF_HW	Bob
4	Hello	Sam

• logout Bye, Sam.

• login Bob 123456 Welcome, Bob.

• delete-post 1 Delete successfully.

• read 1

Post does not exist.

• logout Bye, Bob.

• exit

Grade (100%)

create-board command. – (10%) create-post command. – (20%) list-board command. – (15%)

list-post command. – (15%) read command. – (10%)

delete-post command. – (10%) update-post command. – (10%) comment command. – (10%)

Submission

Please upload a zip file called “hw2_{$student_id}.zip” that includes your source code. Submission that don’t follow the rule will get 20% punishment on the grade.

You will get 0 points on this project for plagiarism. Please don’t copy-paste any code!

Note

You will be asked to use AWS resources in projects 3 and 4, so we suggest you use AWS SDK supported languages to implement this project.

Reference

1. C/C++ Socket

2. SQLite C/C++ Interface

3. Linux socket SELECT

4. AWS SDK supported languages