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distinct.go
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distinct.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"
"time"
"go.mongodb.org/mongo-driver/mongo/options"
"go.mongodb.org/mongo-driver/x/bsonx"
"go.mongodb.org/mongo-driver/x/mongo/driver/session"
"go.mongodb.org/mongo-driver/x/mongo/driver/topology"
"go.mongodb.org/mongo-driver/x/mongo/driver/uuid"
"go.mongodb.org/mongo-driver/x/network/command"
"go.mongodb.org/mongo-driver/x/network/description"
"go.mongodb.org/mongo-driver/x/network/result"
)
// Distinct handles the full cycle dispatch and execution of a distinct command against the provided
// topology.
func Distinct(
ctx context.Context,
cmd command.Distinct,
topo *topology.Topology,
selector description.ServerSelector,
clientID uuid.UUID,
pool *session.Pool,
opts ...*options.DistinctOptions,
) (result.Distinct, error) {
ss, err := topo.SelectServer(ctx, selector)
if err != nil {
return result.Distinct{}, err
}
desc := ss.Description()
conn, err := ss.Connection(ctx)
if err != nil {
return result.Distinct{}, err
}
defer conn.Close()
rp, err := getReadPrefBasedOnTransaction(cmd.ReadPref, cmd.Session)
if err != nil {
return result.Distinct{}, 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 result.Distinct{}, err
}
defer cmd.Session.EndSession()
}
distinctOpts := options.MergeDistinctOptions(opts...)
if distinctOpts.MaxTime != nil {
cmd.Opts = append(cmd.Opts, bsonx.Elem{
"maxTimeMS", bsonx.Int64(int64(*distinctOpts.MaxTime / time.Millisecond)),
})
}
if distinctOpts.Collation != nil {
if desc.WireVersion.Max < 5 {
return result.Distinct{}, ErrCollation
}
collDoc, err := bsonx.ReadDoc(distinctOpts.Collation.ToDocument())
if err != nil {
return result.Distinct{}, err
}
cmd.Opts = append(cmd.Opts, bsonx.Elem{"collation", bsonx.Document(collDoc)})
}
return cmd.RoundTrip(ctx, desc, conn)
}