panic: not an App Engine context

[prakas...@gmail.com]

Hi,

I'm getting this error while running the application in my local system, code is below. Some one can help me to resolve this error.

panic: not an App Engine context

datastore.go

package main

import (
	"log"
	"net/http"
	"os"
	"encoding/json"

	"cloud.google.com/go/datastore"

	"golang.org/x/net/context"

	"google.golang.org/appengine"
)

var datastoreClient *datastore.Client

func main() {
	ctx := context.Background()

	// Set this in app.yaml when running in production.
	projectID := os.Getenv("GCLOUD_DATASET_ID")

	var err error
	datastoreClient, err = datastore.NewClient(ctx, projectID)
	if err != nil {
		log.Fatal(err)
	}

	http.HandleFunc("/", articlesList)
	appengine.Main()
}


type Article struct {
  ID      int64
  Title   string
  Content string
}
func articlesList(res http.ResponseWriter, req *http.Request) {
	ctx := context.Background()
	query := datastore.NewQuery("Article").
		Order("Title").
		Limit(10)

	articles := make([]*Article, 0)
	_, err := datastoreClient.GetAll(ctx, query, &articles)
	if err != nil {
      http.Error(res, err.Error(), http.StatusInternalServerError)
      return
        }
	json.NewEncoder(res).Encode(articles)
}

app.yaml


runtime: go
api_version: go1

handlers:
- url: /.*
  script: _go_app

#env: flex

#automatic_scaling:
#  min_num_instances: 1

#[START env_variables]
env_variables:
  GCLOUD_DATASET_ID: <ProjectId>
#[END env_variables]

[pj]

You can't use context.Background()

You have to use newcontext(r) from app engine package

[Prakash Natarajan]

Hi Pj,

    Thanks for your help.

Thanks,

Prakash.N

On Fri, Oct 6, 2017 at 5:09 PM, pj <p...@skylove.ly> wrote:

You can't use context.Background()

You have to use newcontext(r) from app engine package

--
You received this message because you are subscribed to a topic in the Google Groups "google-appengine-go" group.
To unsubscribe from this topic, visit https://groups.google.com/d/topic/google-appengine-go/i07tIM3ACAk/unsubscribe.
To unsubscribe from this group and all its topics, send an email to google-appengine-go+unsub...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/google-appengine-go/390438a6-96f6-407b-a3d9-8453c356e23d%40googlegroups.com.

For more options, visit https://groups.google.com/d/optout.