Build a version controlled key-value store with a HTTP API we can query that from. The API needs to be able to:
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Accept a key(string) and value(some json blob/string) {"key" : "value"} and store them. If an existing key is sent, the value should be updated
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Accept a key and return the corresponding latest value
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When given a key AND a timestamp, return whatever the value of the key at the time was.
Assume only GET and POST requests for simplicity.
Example:
Method: POST
Endpoint: /object
Body: JSON: {mykey : value1}
Time: 6pm
Method: GET
Endpoint: /object/mykey
Response: value1
Method: POST
Endpoint: /object
Body: JSON: {mykey : value2}
Time: 6.05 pm
Method: GET
Endpoint: /object/mykey
Response: value2
Method: GET
Endpoint: /object/mykey?timestamp=1440568980 [6.03pm]
Response: value1
All timestamps are unix timestamps according UTC timezone.
Guidelines:
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Use NodeJS for scripting the backend.
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Deploy this to a server and give us the URL
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Push the code to a public git repository and give us the URL.
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You are free to use any open source database.
A good submission will have the following characteristics:
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Clean and extendable code
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Handle a wide variety of edge cases
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Not break under a reasonable load
We are NOT judging for algorithmic brilliance or cool one liners. We want to see if you can write production quality code. So please build this assuming you are building a production quality service.