Implimenting the ContextDialer interface

Getting Help
1

Im working with the go.mongodb.org/mongo-driver/mongo" driver, and i need to implement a tls handshake using the tls.Dial function so the client can dial to the server with the certificates passed. The only issue is i dont know how to put the pieces together. Here is my attempt of a type that implements the ContextDialer interface

dialer := func(context.Context, string, string) (net.Conn, error){
    return tls.Dial("tcp", "addr", &tls.Config{
          RootCAs:        rootCerts,
           Certificates: clientCerts,
     })
}

And then the client should be able to set a dialer like this for example

clientOpts := options.Client().ApplyURI("mongodb://localhost:27017")
clientOpts.SetDialer(dialer)

the SetDialer() takes in this interface
Unfortunately, here my dialer doesnt implement the ContextDialer interface. How can i implement it?

2

You’re dialer is a function but it should be, for example, a struct with DialContext implementation. Example:

type myDialer struct {}

func (d myDialer) DialContext(ctx context.Context, network, address string) (net.Conn, error) {
     return tls.Dial("tcp", "addr", &tls.Config{
          RootCAs:        rootCerts,
           Certificates: clientCerts,
     })
}

// later...
dialer := myDialer{}
clientOpts := options.Client().ApplyURI("mongodb://localhost:27017")
clientOpts.SetDialer(dialer)
3

Yeah, but i then need to call the method to pass in my certificates like this -

type myDialer struct {
rootcerts *x509.CertPool
clientCerts []tls.Certificate
}

func (d myDialer) DialContext(ctx context.Context, network, address string) (net.Conn, error) {
     return tls.Dial("tcp", "addr", &tls.Config{
          RootCAs:        d.rootCerts,
           Certificates:  d.clientCerts,
     })
}

// later...
dialer := myDialer{}
conn, err := dialer.DialContext(ctx, "tcp", addr)

is it okay to ignore what our DialContext returns? Read the docs and it seems we need to use the conn returned somewhere. Just not sure where

clientOpts := options.Client().ApplyURI("mongodb://localhost:27017")
clientOpts.SetDialer(dialer)
4

Thats why in the beginning, i tried making a function that implements the interface, and easily pass that function when the interface is needed

5

Actually that works. Ignoring what method returns is okay…

6

here you need to assign values to the struct fields first

7

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