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list_collections.go
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/
list_collections.go
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// Copyright (C) MongoDB, Inc. 2017-present.
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may
// not use this file except in compliance with the License. You may obtain
// a copy of the License at http://www.apache.org/licenses/LICENSE-2.0
package driver
import (
"context"
"github.com/mongodb/mongo-go-driver/mongo/options"
"github.com/mongodb/mongo-go-driver/x/bsonx"
"github.com/mongodb/mongo-go-driver/x/mongo/driver/session"
"github.com/mongodb/mongo-go-driver/x/mongo/driver/topology"
"github.com/mongodb/mongo-go-driver/x/mongo/driver/uuid"
"github.com/mongodb/mongo-go-driver/x/network/command"
"github.com/mongodb/mongo-go-driver/x/network/description"
)
// ListCollections handles the full cycle dispatch and execution of a listCollections command against the provided
// topology.
func ListCollections(
ctx context.Context,
cmd command.ListCollections,
topo *topology.Topology,
selector description.ServerSelector,
clientID uuid.UUID,
pool *session.Pool,
opts ...*options.ListCollectionsOptions,
) (command.Cursor, error) {
ss, err := topo.SelectServer(ctx, selector)
if err != nil {
return nil, err
}
conn, err := ss.Connection(ctx)
if err != nil {
return nil, err
}
defer conn.Close()
rp, err := getReadPrefBasedOnTransaction(cmd.ReadPref, cmd.Session)
if err != nil {
return nil, err
}
cmd.ReadPref = rp
// If no explicit session and deployment supports sessions, start implicit session.
if cmd.Session == nil && topo.SupportsSessions() {
cmd.Session, err = session.NewClientSession(pool, clientID, session.Implicit)
if err != nil {
return nil, err
}
}
lc := options.MergeListCollectionsOptions(opts...)
if lc.NameOnly != nil {
cmd.Opts = append(cmd.Opts, bsonx.Elem{"nameOnly", bsonx.Boolean(*lc.NameOnly)})
}
return cmd.RoundTrip(ctx, ss.Description(), ss, conn)
}