Hydros
Hydros creates and regularly updates a SQL table given a datasource and a transform function. Typically this is used to keep an analytics SQL database up-to-date from production databases.
For example, you might need to JOIN across user accounts in MongoDB and usage counters in Redis. Hydros makes it easy to keep a SQL table synced with each of those production databases, and then run the JOIN query without hitting production resources.
A hydros implementation of an "Active Users" table might work like this:
list
user IDs from Mongoget
each user's activity by pulling counters from Redis
A hydros table pulls data from a source via the list
and get
methods, which you implement. The list
method generates a complete list of ids. Then get
generates all the rows associated with each id.
Usage
Hydros is an abstract module. It handles table creation and syncing. You just need to specify the name, columns, list
and get
functions:
var Hydros = ; var APIUsage = ; connection // every two hours start;
License
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(The MIT License)
Copyright (c) 2013 Segment.io Inc. friends@segment.io
Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the 'Software'), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
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