| // 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/bson" |
| "github.com/mongodb/mongo-go-driver/mongo/writeconcern" |
| "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" |
| ) |
| |
| // Write handles the full cycle dispatch and execution of a write command against the provided |
| // topology. |
| func Write( |
| ctx context.Context, |
| cmd command.Write, |
| topo *topology.Topology, |
| selector description.ServerSelector, |
| clientID uuid.UUID, |
| pool *session.Pool, |
| ) (bson.Raw, error) { |
| |
| ss, err := topo.SelectServer(ctx, selector) |
| if err != nil { |
| return nil, err |
| } |
| |
| desc := ss.Description() |
| conn, err := ss.Connection(ctx) |
| if err != nil { |
| return nil, err |
| } |
| |
| if !writeconcern.AckWrite(cmd.WriteConcern) { |
| go func() { |
| defer func() { _ = recover() }() |
| defer conn.Close() |
| |
| _, _ = cmd.RoundTrip(ctx, desc, conn) |
| }() |
| |
| return nil, command.ErrUnacknowledgedWrite |
| } |
| defer conn.Close() |
| |
| // 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 |
| } |
| defer cmd.Session.EndSession() |
| } |
| |
| return cmd.RoundTrip(ctx, desc, conn) |
| } |
| |
| // Retryable writes are supported if the server supports sessions, the operation is not |
| // within a transaction, and the write is acknowledged |
| func retrySupported( |
| topo *topology.Topology, |
| desc description.SelectedServer, |
| sess *session.Client, |
| wc *writeconcern.WriteConcern, |
| ) bool { |
| return topo.SupportsSessions() && |
| description.SessionsSupported(desc.WireVersion) && |
| !(sess.TransactionInProgress() || sess.TransactionStarting()) && |
| writeconcern.AckWrite(wc) |
| } |