CODEWITHSUNDEEP
go
Tauseef Ahmad
Tauseef Ahmad

Reputation: 126

How do I properly inject loggers into the database layer of my code?

My main problem is how to inject loggers into the functions attached to the models? So for example, if we have a User model

type User struct {
 id string `json:"id" bson:"id"`
 name string `json:"name" bson:"name"`
}

and then let's we have a function attached to it

func (user *User) Save() {
 ...
}

Now what I want to do with this is to create an struct that has logger and other information attached with it

type UserStruct struct {
 logger ...
 dbConn ...
 ...
}

Now my problem is that if I inject this into the controllers then they would have access to the objects that they don't need. I can't find a nice way to isolate these from the controller and only inject the functions on the models into the controller.

Upvotes: 0

Views: 115

Answers (1)

bereal
bereal

Reputation: 34282

Rather than implementing an active record pattern in Go, I'd suggest using a persistence layer that receives all those data objects like User. For example:

type Persistence struct {
    logger logging.Logger
    conn   *mongo.Client
    // ...
}

func NewPersistence(...) (*Persistence, error) {
    // connect to mongo etc
    return &Persistence{...}, nil
}

func (p *Persistence) SaveUser(user *User) error {
    // ...
}

func (p *Persistence) FindUserByName(username string) (*User, error) {
    // ...
}

Upvotes: 3

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