/
postgres.go
141 lines (116 loc) · 3.2 KB
/
postgres.go
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package es_postgres
import (
"context"
"errors"
"github.com/Masterminds/squirrel"
"github.com/jackc/pgx/v5"
"github.com/jackc/pgx/v5/pgxpool"
"go.opentelemetry.io/otel"
"github.com/batazor/shortlink/internal/pkg/db"
eventsourcing "github.com/batazor/shortlink/internal/pkg/eventsourcing/v1"
)
type Store struct {
db *pgxpool.Pool
Aggregates
Events
}
var psql = squirrel.StatementBuilder.PlaceholderFormat(squirrel.Dollar)
func (s *Store) Init(ctx context.Context, db *db.Store) error {
s.db = db.Store.GetConn().(*pgxpool.Pool)
return nil
}
func (s *Store) save(ctx context.Context, events []*eventsourcing.Event, safe bool) error { // nolint:govet
if len(events) == 0 {
return nil
}
for _, event := range events {
// TODO: use transaction
// Either insert a new aggregate or append to an existing.
if event.Version == 1 { // nolint:nestif
err := s.addAggregate(ctx, event)
if err != nil {
return err
}
err = s.addEvent(ctx, event)
if err != nil {
return err
}
} else {
err := s.updateAggregate(ctx, event)
if err != nil {
return err
}
err = s.addEvent(ctx, event)
if err != nil {
return err
}
}
}
return nil
}
func (s *Store) Save(ctx context.Context, events []*eventsourcing.Event) error {
// start tracing
newCtx, span := otel.Tracer("store").Start(ctx, "Save")
defer span.End()
return s.save(newCtx, events, false)
}
func (s *Store) SafeSave(ctx context.Context, events []*eventsourcing.Event) error {
// start tracing
newCtx, span := otel.Tracer("store").Start(ctx, "SafeSave")
defer span.End()
return s.save(newCtx, events, true)
}
func (s *Store) Load(ctx context.Context, aggregateID string) (*eventsourcing.Snapshot, []*eventsourcing.Event, error) {
// start tracing
_, span := otel.Tracer("store").Start(ctx, "Load")
defer span.End()
// get snapshot if exist
querySnaphot := psql.Select("aggregate_id", "aggregate_type", "aggregate_version", "payload").
From("billing.snapshots").
Where(squirrel.Eq{
"aggregate_id": aggregateID,
})
q, args, err := querySnaphot.ToSql()
if err != nil {
return nil, nil, err
}
var snapshot eventsourcing.Snapshot
row := s.db.QueryRow(ctx, q, args...)
err = row.Scan(&snapshot.AggregateId, &snapshot.AggregateType, &snapshot.AggregateVersion, &snapshot.Payload)
if err != nil && !errors.Is(err, pgx.ErrNoRows) {
return nil, nil, err
}
// get new events
queryEvents := psql.Select("aggregate_type", "id", "type", "payload", "version").
From("billing.events").
Where(
squirrel.And{
squirrel.Eq{"aggregate_id": aggregateID},
squirrel.Gt{"version": snapshot.AggregateVersion},
},
).
OrderBy("created_at")
q, args, err = queryEvents.ToSql()
if err != nil {
return nil, nil, err
}
rows, err := s.db.Query(ctx, q, args...)
if err != nil {
return nil, nil, err
}
if rows.Err() != nil {
return nil, nil, rows.Err()
}
var events []*eventsourcing.Event // nolint:prealloc
for rows.Next() {
event := eventsourcing.Event{
AggregateId: aggregateID,
}
err = rows.Scan(&event.AggregateType, &event.Id, &event.Type, &event.Payload, &event.Version)
if err != nil {
return nil, nil, err
}
events = append(events, &event)
}
return &snapshot, events, nil
}