Connection error rpc with Golang and DGraph

Question

i'm trying make a mutation inside a DGraph database, but when i run the code, it throws me the next error:

rpc error: code = Unavailable desc = connection close exit status 1

I'm using dGraph with docker in the port 8000, my code of golang here:

package main

import (
   "fmt"
   "context"
   "encoding/json"
   "log"
   dgo "github.com/dgraph-io/dgo"
   api "github.com/dgraph-io/dgo/protos/api"
   grpc "google.golang.org/grpc"
)

type Person struct {
   Name string `json:"name,omitempty"`
   Lastname string `json:"lastname,omitempty"`
}

func main() {
conn, err := grpc.Dial("localhost:8000", grpc.WithInsecure())
if err != nil {
  log.Fatal(err)
}
defer conn.Close()
dgraphClient := dgo.NewDgraphClient(api.NewDgraphClient(conn))
p := Person {
    Name: "Giovanni",
    Lastname: "Mosquera Diazgranados",
}
txn := dgraphClient.NewTxn()
ctx := context.Background()
defer txn.Discard(ctx)
pb, err := json.Marshal(p)
if err != nil {
    log.Fatal(err)
}
mu := &api.Mutation{
    SetJson: pb,
}
res, err := txn.Mutate(ctx, mu)
if err != nil {
    fmt.Println("Aqui toy")
    log.Fatal(err)
} else {
    fmt.Println(res)
}
}

How can i solve this error to connect with my DGraph and make a mutation?

user_6220193 · Answer

Welcome to Stack Overflow!

To get your code working locally with the docker "standalone" version of DGraph I had to change 2 things:

use port 9080. The container exposes 3 ports: 8000, 8080, 9080. Using 8080 or 8000 I get the same error you mentioned.
use the v2 imports. Not sure which version of DGraph server you are running, so you might not need to do this. But in case you have a new server you need these imports:

import (
    dgo "github.com/dgraph-io/dgo/v2"
    api "github.com/dgraph-io/dgo/v2/protos/api"
)

user_9296249 · Answer

Port 8000 is for the ratel-ui which comes with dgraph. To make mutations using the dgraph go client you will want to connect to the exposed grpc-alpha port, this is typically on 9080.

Connection error rpc with Golang and DGraph

2 Answers