| // 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" |
| "github.com/mongodb/mongo-go-driver/x/network/result" |
| "time" |
| ) |
| |
| // 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 |
| } |
| cmd.Opts = append(cmd.Opts, bsonx.Elem{"collation", bsonx.Document(distinctOpts.Collation.ToDocument())}) |
| } |
| |
| return cmd.RoundTrip(ctx, desc, conn) |
| } |