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README
Gremlex
An Elixir client for Apache TinkerPop™ aka Gremlin.
Gremlex does not support all functions (yet). It is pretty early on in it's development. But you can always use raw Gremlin queries by using Client.query("<Insert gremlin query>")
Installation
Install from Hex.pm:
def deps do
[
{:gremlex, "~> 0.1.1"}
]
end
Examples
Basic Usage
The two main modules that you'll want to use are Gremlex.Graph
and Gremlex.Client
.
Gremlex.Graph
is the module that hosts all the functions needed to build a Gremlin query.
The DSL is a simple set of functions that carries over a graph for every step. Once you've
defined your query, you can simply call Gremlex.Client.query/1
to perform it.
iex(1)> alias Gremlex.Graph
Gremlex.Graph
iex(2)> alias Gremlex.Client
Gremlex.Client
iex(3)> Graph.g() |> Graph.v() |> Client.query
{:ok,
[
%Gremlex.Vertex{
id: 1,
label: "person",
properties: %{age: [29], name: ["marko"]}
}
]}
Gremlin Query to Gremlex
This gremlin query:
g.V().has("name","marko")
.out("knows")
.out("knows")
.values("name")
Would translate in Gremlex to:
Graph.g()
|> Graph.v()
|> Graph.has("name", "marko")
|> Graph.out("knows")
|> Graph.out("knows")
|> Graph.values("name")
|> Client.query
Raw Queries
Client.query("""
g.V().match(
__.as("a").out("knows").as("b"),
__.as("a").out("created").as("c"),
__.as("b").out("created").as("c"),
__.as("c").in("created").count().is(2)
)
.select("c").by("name")
""")
Configuration
You can configure Gremlex by adding the following to your config.exs
:
config :gremlex,
host: "127.0.0.1",
port: 8182,
path: "/gremlin",
pool_size: 10,
secure: false
ping_delay: 60_000
Gremlex uses confex, so that you can easily define
your configuration to use environment variables when it comes time to deploying. To do so,
simply have the parameters that need to be dynamically read at run time set to {:SYSTEM, "ENV_VAR_NAME"}
.
Parameters
host
: Gremlin host to connect to (defaults to "127.0.0.1")port
: Port Gremlin is listening to on host (defaults to 8182)path
: Websocket path to Gremlin (defaults to "/gremlin")pool_size
: The number of connections to keep open in the pool (defaults to 10)secure
: Set totrue
to connect to a server with SSL enabledping_delay
: Delay in milliseconds to send a pong frame to the server. If 0, then a pong frame won't be scheduled. (defaults to 0)
Contributing
$ git clone https://github.com/Revmaker/gremlex.git
$ cd gremlex
$ mix deps.get
$ mix test
Once you've made your additions and mix test
passes, go ahead and open a PR!
Note: Please make sure you run mix format
on the touched files :)
*Note that all licence references and agreements mentioned in the gremlex README section above
are relevant to that project's source code only.