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stages.go
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stages.go
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// Copyright 2021 FerretDB Inc.
//
// 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
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// Package stages provides aggregation stages.
package stages
import (
"fmt"
"github.com/FerretDB/FerretDB/internal/handlers/common/aggregations"
"github.com/FerretDB/FerretDB/internal/handlers/commonerrors"
"github.com/FerretDB/FerretDB/internal/types"
)
// newStageFunc is a type for a function that creates a new aggregation stage.
type newStageFunc func(stage *types.Document) (aggregations.Stage, error)
// Stages maps all supported aggregation Stages.
var Stages = map[string]newStageFunc{
// sorted alphabetically
"$addFields": newAddFields,
"$collStats": newCollStats,
"$count": newCount,
"$group": newGroup,
"$limit": newLimit,
"$match": newMatch,
"$project": newProject,
"$set": newSet,
"$skip": newSkip,
"$sort": newSort,
"$unset": newUnset,
"$unwind": newUnwind,
// please keep sorted alphabetically
}
// unsupportedStages maps all unsupported yet stages.
var unsupportedStages = map[string]struct{}{
// sorted alphabetically
"$bucket": {},
"$bucketAuto": {},
"$changeStream": {},
"$currentOp": {},
"$densify": {},
"$documents": {},
"$facet": {},
"$fill": {},
"$geoNear": {},
"$graphLookup": {},
"$indexStats": {},
"$listLocalSessions": {},
"$listSessions": {},
"$lookup": {},
"$merge": {},
"$out": {},
"$planCacheStats": {},
"$redact": {},
"$replaceRoot": {},
"$replaceWith": {},
"$sample": {},
"$search": {},
"$searchMeta": {},
"$setWindowFields": {},
"$sharedDataDistribution": {},
"$sortByCount": {},
"$unionWith": {},
// please keep sorted alphabetically
}
// NewStage creates a new aggregation stage.
func NewStage(stage *types.Document) (aggregations.Stage, error) {
if stage.Len() != 1 {
return nil, commonerrors.NewCommandErrorMsgWithArgument(
commonerrors.ErrStageInvalid,
"A pipeline stage specification object must contain exactly one field.",
"aggregate",
)
}
name := stage.Command()
f, supported := Stages[name]
_, unsupported := unsupportedStages[name]
switch {
case supported && unsupported:
panic(fmt.Sprintf("stage %q is in both `stages` and `unsupportedStages`", name))
case supported && !unsupported:
return f(stage)
case !supported && unsupported:
return nil, commonerrors.NewCommandErrorMsgWithArgument(
commonerrors.ErrNotImplemented,
fmt.Sprintf("`aggregate` stage %q is not implemented yet", name),
name+" (stage)", // to differentiate update operator $set from aggregation stage $set, etc
)
case !supported && !unsupported:
return nil, commonerrors.NewCommandErrorMsgWithArgument(
commonerrors.ErrStageGroupInvalidAccumulator,
fmt.Sprintf("Unrecognized pipeline stage name: %q", name),
name+" (stage)", // to differentiate update operator $set from aggregation stage $set, etc
)
}
panic("not reached")
}