python-gremlin-rest

A very simple JSON-REST client to TinkerPop 3 Gremlin Server.

Features:

• gremlin expressions
• transparent scripts execution
• synchronous and asynchronous evaluation

Dependencies

Depends on pyarc to communicate with server and on gremlinpy tp3 to build Gremlin expressions. Supports adding custom scripts from files.

Installation

Unfortunately, currently available only from Github. PyPI package to be done.

# pip install -U gremlinpy \
    git+https://github.com/windj007/pyarc.git \
    git+https://github.com/windj007/python-gremlin-rest.git

Examples

Synchronous mode

from gremlin_rest import GremlinClient
client = GremlinClient('http://172.17.0.29:8182')
print client.gremlin().V().count().run()
# outputs [0]
print client.run_script('g.addV(label, "test", "name", "1")')
# outputs [{u'properties': {u'name': [{u'id': u'17a-3ao-1l1', u'value': u'1'}]}, u'type': u'vertex', u'id': 4272, u'label': u'test'}]
print client.run_script('g.addV(label, "test", prop, val)', prop = 'name', val = 123) 
# outputs [{u'properties': {u'name': [{u'id': u'2dy-6gg-1l1', u'value': 123}]}, u'type': u'vertex', u'id': 8368, u'label': u'test'}]
print client.gremlin().V().count().run()
# outputs [2]
print client.gremlin().V().run()
# outputs [{u'properties': {u'name': [{u'id': u'17a-3ao-1l1', u'value': u'1'}]}, u'type': u'vertex', u'id': 4272, u'label': u'test'}, {u'properties': {u'name': [{u'id': u'2dy-6gg-1l1', u'value': 123}]}, u'type': u'vertex', u'id': 8368, u'label': u'test'}]

Asynchronous mode

from gremlin_rest import GremlinClient, Signature
client = GremlinClient('http://172.17.0.29:8182', async = True)
future = client.run_script('g.V().each { it.remove() }')
print future.get()
# outputs []
print client.gremlin().V().count().run().get()
# outputs [0]
print client.batch([Signature(client.run_script, 'g.addV(label, "test", "name", "1")'),
                    Signature(client.run_script, 'g.addV(label, "test", prop, val)', prop = 'name', val = 123)])
# outputs [[{u'properties': {u'name': [{u'id': u'16t-36w-1l1', u'value': u'1'}]}, u'type': u'vertex', u'id': 4136, u'label': u'test'}], [{u'properties': {u'name': [{u'id': u'16r-36g-1l1', u'value': 123}]}, u'type': u'vertex', u'id': 4120, u'label': u'test'}]]
print client.batch([Signature(client.gremlin().V().count().run),
                    Signature(client.gremlin().V().values('name').run)])
# outputs [[2], [u'1', 123]]

Stored scripts

You can write your scripts in Gremlin-Groovy, save it to a folder, then load and call as if they were usual Python functions.

Useful for complex logic.

mkdir scripts
cat > scripts/select_vertices.groovy <<EOF
query = g.V()
kwargs.each { k, val ->
    query = query.has(k, val);
};
query.toList()
EOF

from gremlin_rest import GremlinClient
client = GremlinClient('http://172.17.0.29:8182')
client.refresh_scripts('./scripts')
client.select_vertices(kwargs = dict(name = 123))
# outputs [{u'id': 4120,
#           u'label': u'test',
#           u'properties': {u'name': [{u'id': u'16r-36g-1l1', u'value': 123}]},
#           u'type': u'vertex'}]

TODO

• tests
• PyPI package
• API cleanup
• ???