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write.go
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write.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/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)
}