move lib/go/gremlin to ent/dialect (#1192)

Summary:
Pull Request resolved: https://github.com/facebookexternal/fbc/pull/1192

Pull Request resolved: https://github.com/facebookincubator/ent/pull/11

Reviewed By: alexsn

Differential Revision: D16377224

fbshipit-source-id: 07ca7436eb9b64fbe2299568560b91466b2417ba

dialect/gremlin/example_test.go

@@ -0,0 +1,41 @@
+package gremlin
+
+import (
+	"context"
+	"flag"
+	"log"
+	"os"
+	"time"
+)
+
+func ExampleClient_Query() {
+	addr := flag.String("gremlin-server", os.Getenv("GREMLIN_SERVER"), "gremlin server address")
+	flag.Parse()
+
+	if *addr == "" {
+		log.Fatal("missing gremlin server address")
+	}
+
+	client, err := NewHTTPClient(*addr, nil)
+	if err != nil {
+		log.Fatalf("creating client: %v", err)
+	}
+
+	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
+	defer cancel()
+
+	rsp, err := client.Query(ctx, "g.E()")
+	if err != nil {
+		log.Fatalf("executing query: %v", err)
+	}
+
+	edges, err := rsp.ReadEdges()
+	if err != nil {
+		log.Fatalf("unmashal edges")
+	}
+
+	for _, e := range edges {
+		log.Println(e.String())
+	}
+	// - Output:
+}