I've done a lot of research regarding context, but I can't seem to find a generally accepted answer, plus I'm new to Go.
In my current code I've var ctx = context.Background()
,which is used in various places.
My concern is, aren't all my code modifying the same context since it's a global variable? .
Yes, I know context is request scoped.
This is part of my code for context.
var ctx = context.Background()
var db *firestore.Client
var auth *aut.Client
func init() {
app, err := firebase.NewApp(ctx, nil)
if err != nil {
log.Fatal(err)
}
db, err = app.Firestore(ctx)
if err != nil {
log.Fatal(err)
}
auth, err = app.Auth(ctx)
if err != nil {
log.Fatal(err)
}
}
func SetRate(r int) (err error) {
//TODO: create last updated field
_, err = db.Collection("Rate").Doc("rate").Set(ctx, map[string]int{"USDT": r})
if err != nil {
log.Println(err)
return err
}
return nil
}
Please try not to use overly complicated words to describe a term.
CodePudding user response:
Its an accepted practice in go
to pass context from function to function. Normally, the first parameter of every function if context
type. I have seen that whenever a context is passed down and has some use-case with in the method scope, a new context is created from parent context.
CodePudding user response:
It is best practice to create a context inside of a function and pass it between functions as needed, rather than having the one context shared across the package. For something like a HTTP server, you will typically see a unique context for each incoming API call.