I have a standard mongo db connection that is initialised using the official Go driver (mongo-go-driver)
The context for this db connection and the connection details are:
setContext = context.Background()
mongoURI := fmt.Sprintf("mongodb://%s:%s@%s/?authSource=admin", mongoUser, mongoPwd, mongoAddress)
mongoContext, cancel := context.WithTimeout(setContext, 5*time.Second)
clientOptions := options.Client().ApplyURI(mongoURI).SetMaxPoolSize(50)
defer cancel()
mongoSession, err := mongo.Connect(mongoContext, clientOptions)
From the documentation, https://godoc.org/golang.org/x/net/context I understand that this is correct:
Background returns a non-nil, empty Context. It is never canceled, has no values, and has no deadline. It is typically used by the main function, initialization, and tests, and as the top-level Context for incoming requests.
Now, when running my queries against this connection, what context should I be using?
Here's an example of using the connection:
mongoConnection := myMongoSessionOfficialDriver.Database(db).Collection(collection)
pipeOptions := options.Aggregate().SetMaxTime(time.Second * 10)
mongoCursor, err := mongoConnection.Aggregate(context.TODO(), aggregationPipeline, pipeOptions)
My question is this: what should the context be for the cursor?! Should it be background() i'm thinking not if it should be cancelled (when my query returns the data)
In the documentation, for TODO() it says:
TODO returns a non-nil, empty Context. Code should use context.TODO when it's unclear which Context to use or it is not yet available (because the surrounding function has not yet been extended to accept a Context parameter). TODO is recognized by static analysis tools that determine whether Contexts are propagated correctly in a program.
Okay... well what context should I be using for aggregate queries?
