doublethink

RethinkDB python library. Provides connection manager and ORM framework (object-relational mapping, sometimes called ODM or OM for nosql databases).

Connection Manager

Three main purposes:

• round-robin connections among database servers
• make sure connections close at proper time
• retry retry-able queries on failure

Not currently a connection pool, because it doesn’t keep any connections open. Should be possible to implement connection pooling without changing the API. However, testing suggests there would be no appreciable performance gain from connection pooling.

Usage Example

import doublethink
rr = doublethink.Rethinker(['db0.foo.com', 'db0.foo.com:38015', 'db1.foo.com'], 'my_db')
rr.table('mytable').insert({'foo':'bar','baz':2}).run()
for result in rr.table('mytable'):
    print("result={}".format(result))

ORM

Simple yet powerful ORM system. Does not enforce a schema.

Usage Example

import doublethink

rr = doublethink.Rethinker(['db0.foo.com', 'db0.foo.com:38015', 'db1.foo.com'], 'my_db')

class MyTable(doublethink.Document):
    pass
MyTable.table_create(rr)

doc1 = MyTable(rr, {'animal': 'elephant', 'size': 'large'})
doc1.save()

doc1_copy = MyTable.load(rr, doc1.id)
doc1_copy.food = 'bread'
doc1_copy.save()

doc1.first_name = 'Frankworth'
doc1.save()

doc1.refresh()

Service Registry

Now also has a ServiceRegistry class, a lightweight solution for service discovery for distributed services. Maintains service info and status in a rethinkdb table called “services”.