98 lines
2.2 KiB
Go
98 lines
2.2 KiB
Go
package wmo
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import (
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"context"
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"go.mongodb.org/mongo-driver/bson"
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ct "gogs.mikescher.com/BlackForestBytes/goext/cursortoken"
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)
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func (c *Coll[TData]) List(ctx context.Context, filter ct.Filter, pageSize *int, inTok ct.CursorToken) ([]TData, ct.CursorToken, error) {
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if inTok.Mode == ct.CTMEnd {
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return make([]TData, 0), ct.End(), nil
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}
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pipeline := filter.FilterQuery()
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pf1, pd1, pf2, pd2 := filter.Pagination()
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sortPrimary := pf1
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sortDirPrimary := pd1
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sortSecondary := &pf2
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sortDirSecondary := &pd2
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if pf1 == pf2 {
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sortSecondary = nil
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sortDirSecondary = nil
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}
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paginationPipeline, err := CreatePagination(c, inTok, sortPrimary, sortDirPrimary, sortSecondary, sortDirSecondary, pageSize)
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if err != nil {
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return nil, ct.CursorToken{}, err
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}
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pipeline = append(pipeline, paginationPipeline...)
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cursor, err := c.coll.Aggregate(ctx, pipeline)
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if err != nil {
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return nil, ct.CursorToken{}, err
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}
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// fast branch
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if pageSize == nil {
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entries, err := c.decodeAll(ctx, cursor)
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if err != nil {
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return nil, ct.CursorToken{}, err
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}
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return entries, ct.End(), nil
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}
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entities := make([]TData, 0, cursor.RemainingBatchLength())
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for (pageSize == nil || len(entities) != *pageSize) && cursor.Next(ctx) {
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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{}, err
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}
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entities = append(entities, entry)
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}
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if pageSize == nil || len(entities) < *pageSize || !cursor.TryNext(ctx) {
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return entities, ct.End(), nil
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}
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last := entities[len(entities)-1]
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nextToken, err := c.createToken(sortPrimary, sortDirPrimary, sortSecondary, sortDirSecondary, last, pageSize)
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if err != nil {
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return nil, ct.CursorToken{}, err
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}
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return entities, nextToken, nil
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}
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type countRes struct {
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Count int64 `bson:"c"`
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}
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func (c *Coll[TData]) Count(ctx context.Context, filter ct.Filter) (int64, error) {
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pipeline := filter.FilterQuery()
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pipeline = append(pipeline, bson.D{{Key: "$count", Value: "c"}})
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cursor, err := c.coll.Aggregate(ctx, pipeline)
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if err != nil {
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return 0, err
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}
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if cursor.Next(ctx) {
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v := countRes{}
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err = cursor.Decode(&v)
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if err != nil {
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return 0, err
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}
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return v.Count, nil
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}
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return 0, nil
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}
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