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gowebsocketgremlingremlin-server

How to connect to a Gremlin Websocket in Go?

I'm trying to connect to Gremlin which should be running on port 8182 ([INFO] GremlinServer$1 - Channel started at port 8182)

When I'm connecting to: ws://127.0.0.1:8182 I'm getting the response: 

2017/11/03 17:20:04 ERROR: database with the name 'gremlin' gave an error when connecting: websocket: bad handshake.

The Gremlin server responds with:

[WARN] HttpGremlinEndpointHandler - Invalid request - responding with 400 Bad Request and no gremlin script supplied

I'm using Gorilla Websocket in Go to connect:

gremlinGrpcAddress := fmt.Sprintf("ws://%s:%d/", f.config.Host, f.config.Port)

var dialer *websocket.Dialer

clientConn, _, err := dialer.Dial(gremlinGrpcAddress, nil)
if err != nil {
    return err
}

f.client = clientConn

UPDATE:
Connecting to echo.websocket.org works, so somehow it is something in the Gremlin server.

Solution

  • The answer lies in the config YAML file.

    What is needed is the correct channelizer.

    GOOD:

    channelizer: org.apache.tinkerpop.gremlin.server.channel.WebSocketChannelizer