134 lines
2.7 KiB
Go
134 lines
2.7 KiB
Go
package resolvelinks
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import (
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"context"
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"errors"
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"go.sour.is/ev"
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"go.sour.is/ev/pkg/driver"
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"go.sour.is/ev/pkg/event"
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"go.sour.is/pkg/lg"
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)
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type resolvelinks struct {
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up driver.Driver
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}
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func New() *resolvelinks {
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return &resolvelinks{}
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}
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func (r *resolvelinks) Apply(es *ev.EventStore) {
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r.up = es.Driver
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es.Driver = r
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}
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func (r *resolvelinks) Unwrap() driver.Driver {
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return r.up
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}
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func (r *resolvelinks) Open(ctx context.Context, dsn string) (driver.Driver, error) {
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ctx, span := lg.Span(ctx)
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defer span.End()
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return r.up.Open(ctx, dsn)
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}
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func (r *resolvelinks) EventLog(ctx context.Context, streamID string) (driver.EventLog, error) {
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ctx, span := lg.Span(ctx)
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defer span.End()
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l, err := r.up.EventLog(ctx, streamID)
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return &wrapper{l, r}, err
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}
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type wrapper struct {
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up driver.EventLog
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resolver *resolvelinks
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}
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func (r *wrapper) Unwrap() driver.EventLog {
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return r.up
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}
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func (w *wrapper) Read(ctx context.Context, after int64, count int64) (event.Events, error) {
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ctx, span := lg.Span(ctx)
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defer span.End()
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events, err := w.up.Read(ctx, after, count)
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if err != nil {
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return nil, err
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}
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err = w.resolvelinks(ctx, events)
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return events, err
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}
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func (w *wrapper) ReadN(ctx context.Context, index ...uint64) (event.Events, error) {
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ctx, span := lg.Span(ctx)
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defer span.End()
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events, err := w.up.ReadN(ctx, index...)
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if err != nil {
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return nil, err
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}
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err = w.resolvelinks(ctx, events)
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return events, err
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}
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func (w *wrapper) Append(ctx context.Context, events event.Events, version uint64) (uint64, error) {
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ctx, span := lg.Span(ctx)
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defer span.End()
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return w.up.Append(ctx, events, version)
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}
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func (w *wrapper) FirstIndex(ctx context.Context) (uint64, error) {
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ctx, span := lg.Span(ctx)
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defer span.End()
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return w.up.FirstIndex(ctx)
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}
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func (w *wrapper) LastIndex(ctx context.Context) (uint64, error) {
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ctx, span := lg.Span(ctx)
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defer span.End()
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return w.up.LastIndex(ctx)
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}
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func (w *wrapper) resolvelinks(ctx context.Context, events event.Events) error {
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idx := make(map[string][]uint64)
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ptrs := make(map[string][]int)
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for i := range events {
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e := events[i]
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if e, ok := e.(*event.EventPtr); ok {
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idx[e.StreamID] = append(idx[e.StreamID], e.Pos)
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ptrs[e.StreamID] = append(ptrs[e.StreamID], i)
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}
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}
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for streamID, ids := range idx {
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d, err := w.resolver.EventLog(ctx, streamID)
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if err != nil {
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return err
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}
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ptr := ptrs[streamID]
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lis, err := d.ReadN(ctx, ids...)
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if err != nil && !errors.Is(err, ev.ErrNotFound) {
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return err
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}
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for i := range lis {
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meta := lis[i].EventMeta()
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actual := events[ptr[i]].EventMeta()
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meta.ActualPosition = actual.Position
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meta.ActualStreamID = actual.ActualStreamID
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lis[i].SetEventMeta(meta)
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events[i] = lis[i]
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}
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}
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return nil
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}
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