/
aggregate.go
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/
aggregate.go
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// Copyright (C) MongoDB, Inc. 2019-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 operation
import (
"context"
"errors"
"time"
"go.mongodb.org/mongo-driver/bson/bsontype"
"go.mongodb.org/mongo-driver/event"
"go.mongodb.org/mongo-driver/internal/driverutil"
"go.mongodb.org/mongo-driver/mongo/description"
"go.mongodb.org/mongo-driver/mongo/readconcern"
"go.mongodb.org/mongo-driver/mongo/readpref"
"go.mongodb.org/mongo-driver/mongo/writeconcern"
"go.mongodb.org/mongo-driver/x/bsonx/bsoncore"
"go.mongodb.org/mongo-driver/x/mongo/driver"
"go.mongodb.org/mongo-driver/x/mongo/driver/session"
)
// Aggregate represents an aggregate operation.
type Aggregate struct {
allowDiskUse *bool
batchSize *int32
bypassDocumentValidation *bool
collation bsoncore.Document
comment *string
hint bsoncore.Value
maxTime *time.Duration
pipeline bsoncore.Document
session *session.Client
clock *session.ClusterClock
collection string
monitor *event.CommandMonitor
database string
deployment driver.Deployment
readConcern *readconcern.ReadConcern
readPreference *readpref.ReadPref
retry *driver.RetryMode
selector description.ServerSelector
writeConcern *writeconcern.WriteConcern
crypt driver.Crypt
serverAPI *driver.ServerAPIOptions
let bsoncore.Document
hasOutputStage bool
customOptions map[string]bsoncore.Value
timeout *time.Duration
result driver.CursorResponse
}
// NewAggregate constructs and returns a new Aggregate.
func NewAggregate(pipeline bsoncore.Document) *Aggregate {
return &Aggregate{
pipeline: pipeline,
}
}
// Result returns the result of executing this operation.
func (a *Aggregate) Result(opts driver.CursorOptions) (*driver.BatchCursor, error) {
clientSession := a.session
clock := a.clock
opts.ServerAPI = a.serverAPI
return driver.NewBatchCursor(a.result, clientSession, clock, opts)
}
// ResultCursorResponse returns the underlying CursorResponse result of executing this
// operation.
func (a *Aggregate) ResultCursorResponse() driver.CursorResponse {
return a.result
}
func (a *Aggregate) processResponse(info driver.ResponseInfo) error {
var err error
a.result, err = driver.NewCursorResponse(info)
return err
}
// Execute runs this operations and returns an error if the operation did not execute successfully.
func (a *Aggregate) Execute(ctx context.Context) error {
if a.deployment == nil {
return errors.New("the Aggregate operation must have a Deployment set before Execute can be called")
}
return driver.Operation{
CommandFn: a.command,
ProcessResponseFn: a.processResponse,
Client: a.session,
Clock: a.clock,
CommandMonitor: a.monitor,
Database: a.database,
Deployment: a.deployment,
ReadConcern: a.readConcern,
ReadPreference: a.readPreference,
Type: driver.Read,
RetryMode: a.retry,
Selector: a.selector,
WriteConcern: a.writeConcern,
Crypt: a.crypt,
MinimumWriteConcernWireVersion: 5,
ServerAPI: a.serverAPI,
IsOutputAggregate: a.hasOutputStage,
MaxTime: a.maxTime,
Timeout: a.timeout,
Name: driverutil.AggregateOp,
}.Execute(ctx)
}
func (a *Aggregate) command(dst []byte, desc description.SelectedServer) ([]byte, error) {
header := bsoncore.Value{Type: bsontype.String, Data: bsoncore.AppendString(nil, a.collection)}
if a.collection == "" {
header = bsoncore.Value{Type: bsontype.Int32, Data: []byte{0x01, 0x00, 0x00, 0x00}}
}
dst = bsoncore.AppendValueElement(dst, "aggregate", header)
cursorIdx, cursorDoc := bsoncore.AppendDocumentStart(nil)
if a.allowDiskUse != nil {
dst = bsoncore.AppendBooleanElement(dst, "allowDiskUse", *a.allowDiskUse)
}
if a.batchSize != nil {
cursorDoc = bsoncore.AppendInt32Element(cursorDoc, "batchSize", *a.batchSize)
}
if a.bypassDocumentValidation != nil {
dst = bsoncore.AppendBooleanElement(dst, "bypassDocumentValidation", *a.bypassDocumentValidation)
}
if a.collation != nil {
if desc.WireVersion == nil || !desc.WireVersion.Includes(5) {
return nil, errors.New("the 'collation' command parameter requires a minimum server wire version of 5")
}
dst = bsoncore.AppendDocumentElement(dst, "collation", a.collation)
}
if a.comment != nil {
dst = bsoncore.AppendStringElement(dst, "comment", *a.comment)
}
if a.hint.Type != bsontype.Type(0) {
dst = bsoncore.AppendValueElement(dst, "hint", a.hint)
}
if a.pipeline != nil {
dst = bsoncore.AppendArrayElement(dst, "pipeline", a.pipeline)
}
if a.let != nil {
dst = bsoncore.AppendDocumentElement(dst, "let", a.let)
}
for optionName, optionValue := range a.customOptions {
dst = bsoncore.AppendValueElement(dst, optionName, optionValue)
}
cursorDoc, _ = bsoncore.AppendDocumentEnd(cursorDoc, cursorIdx)
dst = bsoncore.AppendDocumentElement(dst, "cursor", cursorDoc)
return dst, nil
}
// AllowDiskUse enables writing to temporary files. When true, aggregation stages can write to the dbPath/_tmp directory.
func (a *Aggregate) AllowDiskUse(allowDiskUse bool) *Aggregate {
if a == nil {
a = new(Aggregate)
}
a.allowDiskUse = &allowDiskUse
return a
}
// BatchSize specifies the number of documents to return in every batch.
func (a *Aggregate) BatchSize(batchSize int32) *Aggregate {
if a == nil {
a = new(Aggregate)
}
a.batchSize = &batchSize
return a
}
// BypassDocumentValidation allows the write to opt-out of document level validation. This only applies when the $out stage is specified.
func (a *Aggregate) BypassDocumentValidation(bypassDocumentValidation bool) *Aggregate {
if a == nil {
a = new(Aggregate)
}
a.bypassDocumentValidation = &bypassDocumentValidation
return a
}
// Collation specifies a collation. This option is only valid for server versions 3.4 and above.
func (a *Aggregate) Collation(collation bsoncore.Document) *Aggregate {
if a == nil {
a = new(Aggregate)
}
a.collation = collation
return a
}
// Comment specifies an arbitrary string to help trace the operation through the database profiler, currentOp, and logs.
func (a *Aggregate) Comment(comment string) *Aggregate {
if a == nil {
a = new(Aggregate)
}
a.comment = &comment
return a
}
// Hint specifies the index to use.
func (a *Aggregate) Hint(hint bsoncore.Value) *Aggregate {
if a == nil {
a = new(Aggregate)
}
a.hint = hint
return a
}
// MaxTime specifies the maximum amount of time to allow the query to run on the server.
func (a *Aggregate) MaxTime(maxTime *time.Duration) *Aggregate {
if a == nil {
a = new(Aggregate)
}
a.maxTime = maxTime
return a
}
// Pipeline determines how data is transformed for an aggregation.
func (a *Aggregate) Pipeline(pipeline bsoncore.Document) *Aggregate {
if a == nil {
a = new(Aggregate)
}
a.pipeline = pipeline
return a
}
// Session sets the session for this operation.
func (a *Aggregate) Session(session *session.Client) *Aggregate {
if a == nil {
a = new(Aggregate)
}
a.session = session
return a
}
// ClusterClock sets the cluster clock for this operation.
func (a *Aggregate) ClusterClock(clock *session.ClusterClock) *Aggregate {
if a == nil {
a = new(Aggregate)
}
a.clock = clock
return a
}
// Collection sets the collection that this command will run against.
func (a *Aggregate) Collection(collection string) *Aggregate {
if a == nil {
a = new(Aggregate)
}
a.collection = collection
return a
}
// CommandMonitor sets the monitor to use for APM events.
func (a *Aggregate) CommandMonitor(monitor *event.CommandMonitor) *Aggregate {
if a == nil {
a = new(Aggregate)
}
a.monitor = monitor
return a
}
// Database sets the database to run this operation against.
func (a *Aggregate) Database(database string) *Aggregate {
if a == nil {
a = new(Aggregate)
}
a.database = database
return a
}
// Deployment sets the deployment to use for this operation.
func (a *Aggregate) Deployment(deployment driver.Deployment) *Aggregate {
if a == nil {
a = new(Aggregate)
}
a.deployment = deployment
return a
}
// ReadConcern specifies the read concern for this operation.
func (a *Aggregate) ReadConcern(readConcern *readconcern.ReadConcern) *Aggregate {
if a == nil {
a = new(Aggregate)
}
a.readConcern = readConcern
return a
}
// ReadPreference set the read preference used with this operation.
func (a *Aggregate) ReadPreference(readPreference *readpref.ReadPref) *Aggregate {
if a == nil {
a = new(Aggregate)
}
a.readPreference = readPreference
return a
}
// ServerSelector sets the selector used to retrieve a server.
func (a *Aggregate) ServerSelector(selector description.ServerSelector) *Aggregate {
if a == nil {
a = new(Aggregate)
}
a.selector = selector
return a
}
// WriteConcern sets the write concern for this operation.
func (a *Aggregate) WriteConcern(writeConcern *writeconcern.WriteConcern) *Aggregate {
if a == nil {
a = new(Aggregate)
}
a.writeConcern = writeConcern
return a
}
// Retry enables retryable writes for this operation. Retries are not handled automatically,
// instead a boolean is returned from Execute and SelectAndExecute that indicates if the
// operation can be retried. Retrying is handled by calling RetryExecute.
func (a *Aggregate) Retry(retry driver.RetryMode) *Aggregate {
if a == nil {
a = new(Aggregate)
}
a.retry = &retry
return a
}
// Crypt sets the Crypt object to use for automatic encryption and decryption.
func (a *Aggregate) Crypt(crypt driver.Crypt) *Aggregate {
if a == nil {
a = new(Aggregate)
}
a.crypt = crypt
return a
}
// ServerAPI sets the server API version for this operation.
func (a *Aggregate) ServerAPI(serverAPI *driver.ServerAPIOptions) *Aggregate {
if a == nil {
a = new(Aggregate)
}
a.serverAPI = serverAPI
return a
}
// Let specifies the let document to use. This option is only valid for server versions 5.0 and above.
func (a *Aggregate) Let(let bsoncore.Document) *Aggregate {
if a == nil {
a = new(Aggregate)
}
a.let = let
return a
}
// HasOutputStage specifies whether the aggregate contains an output stage. Used in determining when to
// append read preference at the operation level.
func (a *Aggregate) HasOutputStage(hos bool) *Aggregate {
if a == nil {
a = new(Aggregate)
}
a.hasOutputStage = hos
return a
}
// CustomOptions specifies extra options to use in the aggregate command.
func (a *Aggregate) CustomOptions(co map[string]bsoncore.Value) *Aggregate {
if a == nil {
a = new(Aggregate)
}
a.customOptions = co
return a
}
// Timeout sets the timeout for this operation.
func (a *Aggregate) Timeout(timeout *time.Duration) *Aggregate {
if a == nil {
a = new(Aggregate)
}
a.timeout = timeout
return a
}