minidb

This is a minimal in-memory distributed master-less document database database.

API

Cluster:

• Auto-cluster: automatically create a cluster specified in the configuration minidb_cluster:join(), or manually make a cluster passing a list of seeds minidb_cluster:make([bootstrap_node1]).
• Cluster status: minidb_cluster:status()
• Join a cluster: minidb_cluster:join('bootstrap_node')
• Leave a cluster: minidb_cluster:leave()
• Ping a random node: minidb:ping()

CRUD:

• Create/Update a key: minidb:put(key, value)
• Patch a value: minidb:patch(key, {subkey1, subvalue1})
• Read a value: minidb:get(key) or minidb:get(key, default)
• Query database: minidb:find([..])
• Get all keys: minidb:keys()
• Delete a key: minidb:delete
• Drop everything: minidb:drop()

Query:

The query language is similar to the one used by mongodb:

minidb:find([{"section", {'$eq', "books"}}, {"likes", {'$gt', 100}])

Operators available:

Op.	Name	Example
'$eq'	Equals	{"section", {'$eq', "books"}}
'$ne'	Not Equals	{"section", {'$ne', "books"}}
'$gt'	Greater Than	{"likes", {'$gt', 100}}
'$gte'	Greater or Equals	{"likes", {'$gte', 100}}
'$lt'	Lower Than	{"likes", {'$lt', 100}}
'$lte'	Lower or Equals	{"likes", {'$lte', 100}}

Note: to get everything: minidb:find([]).

Build

$ rebar3 compile

Run demo

Start the first node:

$ make node1

Start the second node:

$ make node2

After 5 seconds, the second node will automatically connect to the first in a cluster.

To clean all the configuration (cluster informations):

$ make clean