Beyond HTTP, Breaking Free of The Web

Transcript

1. Beyond HTTP, Breaking Free of The Web Mark Wolfe

2. –From http://www.w3.org/DesignIssues/Architecture.html “The most fundamental specification of Web architecture, while

   one of the simpler, is that of the Universal Resource Identifier, or URI.”

3. –From https://tools.ietf.org/html/rfc2616 “The Hypertext Transfer Protocol (HTTP) is an application

   protocol for distributed, collaborative, hypermedia information systems.”

4. – From http://en.wikipedia.org/wiki/Application_programming_interface “In computer programming, an application programming interface

   (API) is a set of routines, protocols, and tools for building software applications.”

5. APIs We Use != http DNS Used to resolve host

   names Also used for service discovery MDNS SPDY

6. Wireshark Network protocol analyser Our window into the wonderful world

   of protocols and APIs Available for Windows, OSX and Linux https://www.wireshark.org/ The wire doesn’t lie

7. DNS? Protocol uses UDP or TCP for transport Consists of

   Questions and Answers Includes some information on authority Uses "intelligent retransmission” Small messages

8. DNS Continued.. Binary protocol Fixed header Payload uses a compact

   self describing binary format TLV (type length value)

9. DNS Question

10. DNS Answer

11. DNS Exchange

12. HTTP Get Request

13. In Review Compact messages More likely to transit “wireless” networks

    Extensible self describing binary payload Established encoding so others can introspect without a definition! Fast

14. MDNS Uses UDP Over Multicast Designed for resolving names in

    adhoc networks Uses the existing DNS message structure, name syntax, and resource record types

15. Something Simpler? So lets look at something simpler than DNS

    What if we just put text in a UDP packet What would that look like?

16. Problem I want to send 10s of 1000s of metrics

    to a server for aggregation with minimal performance impact I want to keep it simple I want the server to be a staging area for data Perform Aggregation Flush to timeseries at regular intervals

17. statsd Developed by etsy Uses UDP as a transport Data

    is encoded using text Metrics are either a Gauge, Counter, Timer or Meter No reply necessary!

18. statsd protocol Metrics are generally of the form <metric name>:<value>|<type>

    outside_temp|12.2|g get_home_request_time|123|ms get_home_request|1|c

19. In Review Very simple implementation Doesn’t block Fast Loss doesn’t

    really matter in the scheme of things Maths happens in the server
20. None

21. The End @wolfeidau on twitter https://github.com/wolfeidau mark@wolfe.id.au http://wolfe.id.au

22. Links Good article on DNS message format https://www.wireshark.org/ Read this

    book High Performance Browser Networking Etsy Statsd