/
row.go
124 lines (112 loc) · 3.72 KB
/
row.go
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/*
* MIT License
*
* Copyright (c) 2022-2024 Tochemey
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
package postgres
import (
"fmt"
"github.com/pkg/errors"
"github.com/tochemey/ego/egopb"
"google.golang.org/protobuf/proto"
"google.golang.org/protobuf/reflect/protoreflect"
"google.golang.org/protobuf/reflect/protoregistry"
"google.golang.org/protobuf/types/known/anypb"
)
// row represents the events store row
type row struct {
PersistenceID string
SequenceNumber uint64
IsDeleted bool
EventPayload []byte
EventManifest string
StatePayload []byte
StateManifest string
Timestamp int64
ShardNumber uint64
}
// ToEvent convert row to event
func (x row) ToEvent() (*egopb.Event, error) {
// unmarshal the event and the state
evt, err := toProto(x.EventManifest, x.EventPayload)
if err != nil {
return nil, errors.Wrap(err, "failed to unmarshal the journal event")
}
state, err := toProto(x.StateManifest, x.StatePayload)
if err != nil {
return nil, errors.Wrap(err, "failed to unmarshal the journal state")
}
return &egopb.Event{
PersistenceId: x.PersistenceID,
SequenceNumber: x.SequenceNumber,
IsDeleted: x.IsDeleted,
Event: evt,
ResultingState: state,
Timestamp: x.Timestamp,
Shard: x.ShardNumber,
}, nil
}
// rows defines the list of row
type rows []*row
// ToEvents converts rows to events
func (x rows) ToEvents() ([]*egopb.Event, error) {
// create the list of events
events := make([]*egopb.Event, 0, len(x))
// iterate the rows
for _, row := range x {
// unmarshal the event and the state
evt, err := toProto(row.EventManifest, row.EventPayload)
if err != nil {
return nil, errors.Wrap(err, "failed to unmarshal the journal event")
}
state, err := toProto(row.StateManifest, row.StatePayload)
if err != nil {
return nil, errors.Wrap(err, "failed to unmarshal the journal state")
}
// create the event and add it to the list of events
events = append(events, &egopb.Event{
PersistenceId: row.PersistenceID,
SequenceNumber: row.SequenceNumber,
IsDeleted: row.IsDeleted,
Event: evt,
ResultingState: state,
Timestamp: row.Timestamp,
Shard: row.ShardNumber,
})
}
return events, nil
}
// toProto converts a byte array given its manifest into a valid proto message
func toProto(manifest string, bytea []byte) (*anypb.Any, error) {
mt, err := protoregistry.GlobalTypes.FindMessageByName(protoreflect.FullName(manifest))
if err != nil {
return nil, err
}
pm := mt.New().Interface()
err = proto.Unmarshal(bytea, pm)
if err != nil {
return nil, err
}
if cast, ok := pm.(*anypb.Any); ok {
return cast, nil
}
return nil, fmt.Errorf("failed to unpack message=%s", manifest)
}