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request.go
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request.go
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package gremgoser
import (
"encoding/base64"
"encoding/json"
"github.com/google/uuid"
)
type requester interface {
prepare() error
getID() string
getRequest() *GremlinRequest
}
// prepareRequest packages a query and binding into the format that Gremlin Server accepts
func prepareRequest(query string, bindings, rebindings map[string]interface{}) *GremlinRequest {
req := &GremlinRequest{}
req.RequestId = uuid.New()
req.Op = "eval"
req.Processor = ""
req.Args = make(map[string]interface{})
req.Args["language"] = "gremlin-groovy"
req.Args["gremlin"] = query
req.Args["bindings"] = bindings
req.Args["rebindings"] = rebindings
return req
}
// prepareAuthRequest creates a ws request for Gremlin Server
func prepareAuthRequest(requestId uuid.UUID, username, password string) *GremlinRequest {
req := &GremlinRequest{}
req.RequestId = requestId
req.Op = "authentication"
req.Processor = "traversal"
var simpleAuth []byte
user := []byte(username)
pass := []byte(password)
simpleAuth = append(simpleAuth, 0)
simpleAuth = append(simpleAuth, user...)
simpleAuth = append(simpleAuth, 0)
simpleAuth = append(simpleAuth, pass...)
req.Args = make(map[string]interface{})
req.Args["sasl"] = base64.StdEncoding.EncodeToString(simpleAuth)
return req
}
// formatMessage takes a request type and formats it into being able to be delivered to Gremlin Server
func packageRequest(req *GremlinRequest) ([]byte, error) {
msg := []byte{}
j, err := json.Marshal(req) // Formats request into byte format
if err != nil {
return msg, err
}
mimeType := []byte("!application/vnd.gremlin-v2.0+json")
msg = append(mimeType, j...)
return msg, nil
}
// dispatchRequest sends the request for writing to the remote Gremlin Server
func (c *Client) dispatchRequest(msg []byte) {
c.verbose("dispatching request: %s", msg)
c.requests <- msg
}