goext/wmo/queryList.go

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package wmo
import (
"context"
"go.mongodb.org/mongo-driver/bson"
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"go.mongodb.org/mongo-driver/mongo"
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ct "gogs.mikescher.com/BlackForestBytes/goext/cursortoken"
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"gogs.mikescher.com/BlackForestBytes/goext/exerr"
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"gogs.mikescher.com/BlackForestBytes/goext/langext"
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)
func (c *Coll[TData]) List(ctx context.Context, filter ct.Filter, pageSize *int, inTok ct.CursorToken) ([]TData, ct.CursorToken, error) {
if inTok.Mode == ct.CTMEnd {
return make([]TData, 0), ct.End(), nil
}
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pipeline := mongo.Pipeline{}
pf1 := "_id"
pd1 := ct.SortASC
pf2 := "_id"
pd2 := ct.SortASC
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if filter != nil {
pipeline = filter.FilterQuery()
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pf1, pd1, pf2, pd2 = filter.Pagination()
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}
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sortPrimary := pf1
sortDirPrimary := pd1
sortSecondary := &pf2
sortDirSecondary := &pd2
if pf1 == pf2 {
sortSecondary = nil
sortDirSecondary = nil
}
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paginationPipeline, err := createPaginationPipeline(c, inTok, sortPrimary, sortDirPrimary, sortSecondary, sortDirSecondary, pageSize)
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if err != nil {
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return nil, ct.CursorToken{}, exerr.
Wrap(err, "failed to create pagination").
WithType(exerr.TypeCursorTokenDecode).
Str("collection", c.Name()).
Any("inTok", inTok).
Any("sortPrimary", sortPrimary).
Any("sortDirPrimary", sortDirPrimary).
Any("sortSecondary", sortSecondary).
Any("sortDirSecondary", sortDirSecondary).
Any("pageSize", pageSize).
Build()
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}
pipeline = append(pipeline, paginationPipeline...)
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for _, ppl := range c.extraModPipeline {
pipeline = langext.ArrConcat(pipeline, ppl(ctx))
}
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cursor, err := c.coll.Aggregate(ctx, pipeline)
if err != nil {
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return nil, ct.CursorToken{}, exerr.Wrap(err, "mongo-aggregation failed").Any("pipeline", pipeline).Str("collection", c.Name()).Build()
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}
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// fast branch
if pageSize == nil {
entries, err := c.decodeAll(ctx, cursor)
if err != nil {
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return nil, ct.CursorToken{}, exerr.Wrap(err, "failed to all-decode entities").Build()
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}
return entries, ct.End(), nil
}
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entities := make([]TData, 0, cursor.RemainingBatchLength())
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for (pageSize == nil || len(entities) != *pageSize) && cursor.Next(ctx) {
var entry TData
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entry, err = c.decodeSingle(ctx, cursor)
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if err != nil {
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return nil, ct.CursorToken{}, exerr.Wrap(err, "failed to decode entity").Build()
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}
entities = append(entities, entry)
}
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if pageSize == nil || len(entities) < *pageSize || !cursor.TryNext(ctx) {
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return entities, ct.End(), nil
}
last := entities[len(entities)-1]
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c.EnsureInitializedReflection(last)
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nextToken, err := c.createToken(sortPrimary, sortDirPrimary, sortSecondary, sortDirSecondary, last, pageSize)
if err != nil {
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return nil, ct.CursorToken{}, exerr.Wrap(err, "failed to create (out)-token").Build()
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}
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return entities, nextToken, nil
}
func (c *Coll[TData]) Count(ctx context.Context, filter ct.RawFilter) (int64, error) {
type countRes struct {
Count int64 `bson:"c"`
}
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pipeline := filter.FilterQuery()
pipeline = append(pipeline, bson.D{{Key: "$count", Value: "c"}})
cursor, err := c.coll.Aggregate(ctx, pipeline)
if err != nil {
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return 0, exerr.Wrap(err, "mongo-aggregation failed").Any("pipeline", pipeline).Str("collection", c.Name()).Build()
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}
if cursor.Next(ctx) {
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v := countRes{}
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err = cursor.Decode(&v)
if err != nil {
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return 0, exerr.Wrap(err, "failed to decode entity").Build()
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}
return v.Count, nil
}
return 0, nil
}
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func (c *Coll[TData]) ListWithCount(ctx context.Context, filter ct.Filter, pageSize *int, inTok ct.CursorToken) ([]TData, ct.CursorToken, int64, error) {
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// NOTE: Possible optimization: Cache count in CursorToken, then fetch count only on first page.
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count, err := c.Count(ctx, filter)
if err != nil {
return nil, ct.CursorToken{}, 0, err
}
data, token, err := c.List(ctx, filter, pageSize, inTok)
if err != nil {
return nil, ct.CursorToken{}, 0, err
}
return data, token, count, nil
}
func createPaginationPipeline[TData any](coll *Coll[TData], token ct.CursorToken, fieldPrimary string, sortPrimary ct.SortDirection, fieldSecondary *string, sortSecondary *ct.SortDirection, pageSize *int) ([]bson.D, error) {
cond := bson.A{}
sort := bson.D{}
valuePrimary, err := coll.getTokenValueAsMongoType(token.ValuePrimary, fieldPrimary)
if err != nil {
return nil, exerr.Wrap(err, "failed to get (primary) token-value as mongo-type").Build()
}
if sortPrimary == ct.SortASC {
// We sort ASC on <field> - so we want all entries newer ($gt) than the $primary
cond = append(cond, bson.M{fieldPrimary: bson.M{"$gt": valuePrimary}})
sort = append(sort, bson.E{Key: fieldPrimary, Value: +1})
} else if sortPrimary == ct.SortDESC {
// We sort DESC on <field> - so we want all entries older ($lt) than the $primary
cond = append(cond, bson.M{fieldPrimary: bson.M{"$lt": valuePrimary}})
sort = append(sort, bson.E{Key: fieldPrimary, Value: -1})
}
if fieldSecondary != nil && sortSecondary != nil && *fieldSecondary != fieldPrimary {
valueSecondary, err := coll.getTokenValueAsMongoType(token.ValueSecondary, *fieldSecondary)
if err != nil {
return nil, exerr.Wrap(err, "failed to get (secondary) token-value as mongo-type").Build()
}
if *sortSecondary == ct.SortASC {
// the conflict-resolution condition, for entries with the _same_ <field> as the $primary we take the ones with a greater $secondary (= newer)
cond = append(cond, bson.M{"$and": bson.A{
bson.M{fieldPrimary: valuePrimary},
bson.M{*fieldSecondary: bson.M{"$gt": valueSecondary}},
}})
sort = append(sort, bson.E{Key: fieldPrimary, Value: +1})
} else if *sortSecondary == ct.SortDESC {
// the conflict-resolution condition, for entries with the _same_ <field> as the $primary we take the ones with a smaller $secondary (= older)
cond = append(cond, bson.M{"$and": bson.A{
bson.M{fieldPrimary: valuePrimary},
bson.M{*fieldSecondary: bson.M{"$lt": valueSecondary}},
}})
sort = append(sort, bson.E{Key: fieldPrimary, Value: -1})
}
}
pipeline := make([]bson.D, 0, 3)
if token.Mode == ct.CTMStart {
// no gt/lt condition
} else if token.Mode == ct.CTMNormal {
pipeline = append(pipeline, bson.D{{Key: "$match", Value: bson.M{"$or": cond}}})
} else if token.Mode == ct.CTMEnd {
// false
pipeline = append(pipeline, bson.D{{Key: "$match", Value: bson.M{"$expr": bson.M{"$eq": bson.A{"1", "0"}}}}})
} else {
return nil, exerr.New(exerr.TypeInternal, "unknown ct mode: "+string(token.Mode)).Any("token.Mode", token.Mode).Build()
}
pipeline = append(pipeline, bson.D{{Key: "$sort", Value: sort}})
if pageSize != nil {
pipeline = append(pipeline, bson.D{{Key: "$limit", Value: int64(*pageSize + 1)}})
}
return pipeline, nil
}