Variable is nil even after initialization

Question

Here's the code config/config.go

const PROJECT_ID = "projectid"

var Ctx = context.Background()

var DSClient *datastore.Client

type Logger struct {
    Pkg string
}

func (l *Logger) Error(v ...interface{}) {
    log.Print("Error|", l.Pkg, ": ", v)
}

func (l *Logger) Info(v ...interface{}) {
    log.Print("Info|", l.Pkg, ": ", v)
}
var propFile = "${env}.properties"
var Props *properties.Properties

func init(){
    Props = properties.MustLoadFile(propFile, properties.UTF8)
    DSClient, err := datastore.NewClient(Ctx, PROJECT_ID)
    if err != nil {
        log.Fatal("Couldn't connect to DataStore: ", err)
    }
    log.Print("DataStore Client: ", DSClient)
}

index/index.go

    import (
    ...
    "github.com/shwetanka19/project/internal/config"
)
    urs := [] user.User{}
    q := datastore.NewQuery("users").Filter("email=", greq.Email).Limit(1)
    logger.Info("Now Client: ", config.DSClient)
    keys, err := config.DSClient.GetAll(config.Ctx, q, &urs)

logs

DataStore Client: &{0xc000010840 0xc000119d40 projectid}

[Now Client:  <nil>]

Why is Client nil now when it was already initialized? Code in index.go is called during an API call. While config is called when server starts.

Edited the question. Added full code. – Shwetanka Mar 26 '20 at 07:12 — Shwetanka, Mar 26 '20 at 07:12
Damn I'm so stupid. Working now. – Shwetanka Mar 26 '20 at 07:27 — Shwetanka, Mar 26 '20 at 07:27

score 1 · Accepted Answer · answered Mar 26 '20 at 07:21

1

When you do

DSClient, err := datastore.NewClient(Ctx, PROJECT_ID)

you create a new variable DSClient that shadows the other one. You just need to change it to:

var err error
DSClient, err = datastore.NewClient(Ctx, PROJECT_ID)

answered Mar 26 '20 at 07:21

dave

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Variable is nil even after initialization

1 Answers1