Geohashing Exercise

Implement a geohashing restful service, as described in XKCD:

Given the following request:

$ curl -i http://localhost:9292/geohash?lat=37.421542&lon=-122.085589

Then a response similar to the following is expected:

HTTP/1.1 200 OK
Content-Type: application/json;charset=utf-8
Content-Length: 35

{"lat":37.857713,"lon":-122.544543}

Query to obtain opening value:

https://query.yahooapis.com/v1/public/yql?q=select%20*%20from%20yahoo.finance.quotes%20where%20symbol%20in%20(%22%5ENDX%22%2C%22INDU%22)&format=json&diagnostics=true&env=store%3A%2F%2Fdatatables.org%2Falltableswithkeys&callback=

Due to Yahoo/Dow Jones Index restrictions you can no longer get DOW opening this way. Instead use ^NDX (NASDAQ-100)

Extra credit items to consider

• Accept lat/lon as POST body parameters
• Cache the DOW opening API call to occur once per day (in memory)
• Implement a in memory cache to store already processed coordinates and their results
• Fetch place name for destination coordinates
• Fetch place name for origin coordinates
• Return the calculated distance between the pair of coordinates