Virtual-Worlds in the Clouds

Grid Computing using on demand / pay as you

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Cloud API: RESTful Web Services

• REST = Representational State Transfer• Conforming to the REST constraints is often referred to as

being ‘RESTful’• Roy Fielding Doctoral Dissertation “Roy Fielding "Architectural

Styles and the Design of Network-based Software Architectures” year 2000 http://www.ics.uci.edu/~fielding/pubs/dissertation/top.htm

• “Adddressability is the idea that every object and resource in your system is reachable through a unique identifier……..URIs”– Scheme://host:port/path?queryString#fragment– http://example.com/customers?lastName=Burke&zipcode=02115

With REST over HTTP you do not have to worry about vendor interoperability you can focus on understanding the data format of the server and application interoperability . …. Bill Burke

Cloud API: CURL

• REST-esting with cURL• curl -i -H "Accept: application/json" -X POST -d "firstName=james"

http://192.168.0.165/persons/person– Where

• i – show response headers• H – pass request headers to the resource• X – pass a HTTP method name• d – pass in parameters enclosed in quotes; multiple

parameters are separated by ‘&’The above command posts the first name “james” to the persons resource. Assuming the server creates a new person resource with first name of James, I also tell the server to return a json representation of the newly created resource.

Good Examples http://blogs.plexibus.com/2009/01/15/rest-esting-with-curl/

Cloud API - API Authentication

GET /v1.0 HTTP/1.1Host: auth.api.rackspacecloud.comX-Auth-User: jdoeX-Auth-Key: a86850deb2742ec3cb41518e26aa2d89

curl -i -H "X-Auth-Key: a86850deb2742ec3cb41518e26aa2d89 " -H "X-Auth-User: jdoe" https://auth.api.rackspacecloud.com/v1.0

HTTP/1.1 204 No ContentDate: Sat, 27 Feb 2010 06:28:49 GMTServer: Apache/2.2.3 (Mosso Engineering)X-Storage-Token: 6ce9397a-4164-44ba-bbd4-e1b6c9a6abc1X-Storage-Url: https://storage5.clouddrive.com/v1/MossoCloudFS_8c1e3b35-d250-4a6d-aa5a-35399b039b1dX-Server-Management-Url: https://servers.api.rackspacecloud.com/v1.0/437001X-CDN-Management-Url: https://cdn.clouddrive.com/v1/MossoCloudFS_8c1e3b35-d250-4a6d-aa5a-35399b039b1dX-Auth-Token: 6ce9397a-4164-44ba-bbd4-e1b6c9a6abc1Content-Length: 0Connection: closeContent-Type: application/octet-stream

Figure on page 7: API Authentication from Cloud Servers Developer Guide 10/15/09

Curl implementation of the above Authentication Request

Rackspace Response

Cloud API - API Version

GET HTTP/1.1Host: servers.api.rackspacecloud.com/

curl -i -H "Accept: application/xml" -H "X-Auth-Token: 6ce9397a-4164-44ba-bbd4-e1b6c9a6abc1" -X GET "https://servers.api.rackspacecloud.com/"

HTTP/1.1 200 OKServer: Apache-Coyote/1.1vary: Accept, Accept-EncodingLast-Modified: Thu, 25 Feb 2010 22:40:13 GMTContent-Type: application/xmlContent-Length: 161Date: Sat, 27 Feb 2010 05:42:06 GMTX-Varnish: 168976310Age: 0Via: 1.1 varnishConnection: close<?xml version="1.0" encoding="UTF-8" standalone="yes"?><versions xmlns="http://docs.rackspacecloud.com/servers/api"> <version status="BETA" id="v1.0"/></versions>

Figure on page 15: API Version

Cloud API - API Version

curl -i -H "Accept: application/xml" -H "X-Auth-Token: 6ce9397a-4164-44ba-bbd4-e1b6c9a6abc1" -X GET https://servers.api.rackspacecloud.com/v1.0/437001/servers/detail > apiServerListDetails.xml

Figure on page 20: List Servers

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Augmented Reality

http://artimes.rouli.net/2009/07/cool-augmented-business-card-from-toxin.html

Cool Augmented Business Card from Toxin Labs

Social Networks

What’s Next

References

• http://www.productionscale.com/home/2009/8/2/using-curl-to-access-the-rackspace-cloud-api.html• http://blogs.plexibus.com/2009/01/15/rest-esting-with-curl/• http://www.ics.uci.edu/~fielding/pubs/dissertation/top.htm• https://manage.rackspacecloud.com/APIAccess.do• http://en.wikipedia.org/wiki/REST• http://oreilly.com/catalog/9780596529260/• http://www.oreillynet.com/pub/wlg/3005• http://15timez.blogspot.com/2010/03/virtual-world-therecom-to-close.html

I was recently talking with Jeff Barr, creator of syndic8 and now Amazon's chief web services evangelist. He let drop an interesting tidbit. Amazon has both SOAP and REST interfaces to their web services, and 85% of their usage is of the REST interface. Despite all of the corporate hype over the SOAP stack, this is pretty compelling evidence that developers like the simpler REST approach. (I know there are many more complex applications where SOAP is better, but I've always liked technologies that have low barriers to entry and grassroots adoption, and simple XML over HTTP approach seems to have that winning combination.) ….. REST vs. SOAP Tim O’Reilly Apr 03, 2003

With REST over HTTP you do not have to worry about vendor interoperability you can focus on understanding the data format of the server and application interoperability . …. Bill Burke