Implement a barebones proxy
In computer systems, a proxy server is just a server that acts being an intermediary for requests from customers seeking sources from different machines. A buyer connects to the proxy server, requesting some assistance, suchs for instance a document, link, web site, or other source available from the different server and the request is evaluated by proxy server as a means to manage and simplify its difficulty. Proxies were created to include encapsulation and construction to distributed programs. Nowadays, many proxies are web proxies, facilitating use of information on the Planet Wide Web.
Step 1: Barebones proxy
Starts a TCP server socket to listen for TCP connections on a specific interface. Whenever a new link is setup, the proxy says in a HTTP request; yourcode must be suitable for HTTP GET requests sent from the curl HTTP client. The proxy must then move on that HTTP request for the webserver, obtain the information obtained, and deliver it back once again to the client on the TCP connection that the client had proven. You must make sure that you are designed for interleaving of requests from multiple clients by keeping suďŹƒcient condition so that you return an answer obtained from a webserver back once again to the right customer.
You need to apply SEO proxy, in the place of continuously study sockets to get information System I/O signal utilizing the select call. Additionally, ensure that you handle all problems therefore That the setup is strong.
Step 2: Make the proxy multi-threaded
To enhance the throughput o ered, create your compensated proxy multi-threaded. The Buy proxies. Obtained, a brand new thread is created to do this. Nevertheless, you need to restrict the number of posts in your code to for the most part 20, in the place of allow the number of Posts grow unbounded.
Step 3: Add a cache to the proxy
To help enhance throughput, put in a cache for your inexpensive proxy-server. At any given moment, the cache must include for the most part 10 MB of information. To evict information in the cache If you find a cache miss, apply minimalRecently-Used (LRU) cache Alternative plan, i.e., usually place in to the cache the absolute most recently used Item and to include it in to the cache, evict the right quantity of least recently-used items in the cache. Make sure that writes and reads from
Step 4: Deploy the proxy on EC2
Requirements and Deliverables
All of your code must certanly be written in C. System I/O must make use of the select, recv, and deliver calls. The next two deliverables are required at the conclusion of the task, each due before class on 31st January 2011. • Release your anonymous proxy on EC2 and e-mail me the address where your proxy is obtainable. Your implementation will be then evaluated by me with my test suite, which will get webpages via your proxy. • E-Mail me an archive which has all of your source-code.
Grading policy
This project may be worth 20 points. 10 items: I'll review your source-code to make sure your execution of (a) select-based plug development, (b) thread pool, and (d) threadsafe cache search proper. 10 items: I'll get webpages via your absolute best paid proxy support utilizing the curl HTTP client. The distribution that produces the most throughput is likely to be given 10 items. The amount of points given to any or all others is likely to be compared to the portion of the optimum throughput their proxy offers.
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