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update.go
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update.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 dispatch
import (
"context"
"github.com/mongodb/mongo-go-driver/core/command"
"github.com/mongodb/mongo-go-driver/core/description"
"github.com/mongodb/mongo-go-driver/core/result"
"github.com/mongodb/mongo-go-driver/core/session"
"github.com/mongodb/mongo-go-driver/core/topology"
"github.com/mongodb/mongo-go-driver/core/uuid"
"github.com/mongodb/mongo-go-driver/core/writeconcern"
"github.com/mongodb/mongo-go-driver/internal/observability"
"go.opencensus.io/stats"
"go.opencensus.io/tag"
"go.opencensus.io/trace"
)
// Update handles the full cycle dispatch and execution of an update command against the provided
// topology.
func Update(
ctx context.Context,
cmd command.Update,
topo *topology.Topology,
selector description.ServerSelector,
clientID uuid.UUID,
pool *session.Pool,
retryWrite bool,
) (result.Update, error) {
ctx, _ = tag.New(ctx, tag.Upsert(observability.KeyMethod, "update"))
ctx, span := trace.StartSpan(ctx, "mongo-go/core/dispatch.Update")
defer span.End()
ss, err := topo.SelectServer(ctx, selector)
if err != nil {
ctx, _ = tag.New(ctx, tag.Upsert(observability.KeyPart, "connect"))
stats.Record(ctx, observability.MErrors.M(1))
span.SetStatus(trace.Status{Code: int32(trace.StatusCodeInternal), Message: err.Error()})
return result.Update{}, err
}
// 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.Update{}, err
}
defer cmd.Session.EndSession()
}
// Execute in a single trip if retry writes not supported, or retry not enabled
if !retrySupported(topo, ss.Description(), cmd.Session, cmd.WriteConcern) || !retryWrite {
if cmd.Session != nil {
cmd.Session.RetryWrite = false // explicitly set to false to prevent encoding transaction number
}
return update(ctx, span, cmd, ss, nil)
}
cmd.Session.RetryWrite = retryWrite
cmd.Session.IncrementTxnNumber()
res, originalErr := update(ctx, span, cmd, ss, nil)
// Retry if appropriate
if cerr, ok := originalErr.(command.Error); ok && cerr.Retryable() ||
res.WriteConcernError != nil && command.IsWriteConcernErrorRetryable(res.WriteConcernError) {
ss, err := topo.SelectServer(ctx, selector)
// Return original error if server selection fails or new server does not support retryable writes
if err != nil || !retrySupported(topo, ss.Description(), cmd.Session, cmd.WriteConcern) {
return res, originalErr
}
return update(ctx, span, cmd, ss, cerr)
}
return res, originalErr
}
func update(
ctx context.Context,
span *trace.Span,
cmd command.Update,
ss *topology.SelectedServer,
oldErr error,
) (result.Update, error) {
desc := ss.Description()
span.Annotatef(nil, "Starting ss.Connection")
conn, err := ss.Connection(ctx)
span.Annotatef(nil, "Finished invoking ss.Connection")
if err != nil {
ctx, _ = tag.New(ctx, tag.Upsert(observability.KeyPart, "connection"))
stats.Record(ctx, observability.MErrors.M(1))
if oldErr != nil {
span.SetStatus(trace.Status{Code: int32(trace.StatusCodeInternal), Message: oldErr.Error()})
return result.Update{}, oldErr
}
span.SetStatus(trace.Status{Code: int32(trace.StatusCodeInternal), Message: err.Error()})
return result.Update{}, err
}
if !writeconcern.AckWrite(cmd.WriteConcern) {
go func() {
defer func() { _ = recover() }()
defer conn.Close()
_, _ = cmd.RoundTrip(ctx, desc, conn)
}()
ctx, _ = tag.New(ctx, tag.Upsert(observability.KeyPart, "write"))
stats.Record(ctx, observability.MErrors.M(1))
span.SetStatus(trace.Status{Code: int32(trace.StatusCodeInternal), Message: "Unacknowledged writes"})
return result.Update{}, command.ErrUnacknowledgedWrite
}
defer conn.Close()
span.Annotatef(nil, "Invoking cmd.RoundTrip")
ures, err := cmd.RoundTrip(ctx, desc, conn)
span.Annotatef(nil, "Finished invoking cmd.RoundTrip")
if err == nil {
stats.Record(ctx, observability.MUpdates.M(1))
} else {
ctx, _ = tag.New(ctx, tag.Upsert(observability.KeyPart, "update"))
stats.Record(ctx, observability.MErrors.M(1))
span.SetStatus(trace.Status{Code: int32(trace.StatusCodeInternal), Message: err.Error()})
}
return ures, err
}