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package migratetest
import (
"bytes"
"context"
"sync"
"github.com/jackc/pgx/v5/pgxpool"
"github.com/target/goalert/devtools/pgdump-lite"
)
// Snapshot is a snapshot of a database's schema and data.
type Snapshot struct {
Schema *pgdump.Schema
TableData []TableSnapshot
}
var snapshotBuf bytes.Buffer
var mx sync.Mutex
// NewSnapshotURL will create a new Snapshot from a database URL.
func NewSnapshotURL(ctx context.Context, dbURL string) (*Snapshot, error) {
cfg, err := pgxpool.ParseConfig(dbURL)
if err != nil {
return nil, err
}
db, err := pgxpool.NewWithConfig(ctx, cfg)
if err != nil {
return nil, err
}
defer db.Close()
return NewSnapshot(ctx, db)
}
// NewSnapshot will create a new Snapshot from a database connection.
func NewSnapshot(ctx context.Context, db *pgxpool.Pool) (*Snapshot, error) {
mx.Lock()
defer mx.Unlock()
schema, err := pgdump.DumpSchema(ctx, db)
if err != nil {
return nil, err
}
snapshotBuf.Reset()
err = pgdump.DumpDataWithSchemaParallel(ctx, db, &snapshotBuf, nil, schema)
if err != nil {
return nil, err
}
scan := NewCopyScanner(&snapshotBuf)
var tables []TableSnapshot
for scan.Scan() {
tables = append(tables, scan.Table())
}
if scan.Err() != nil {
return nil, scan.Err()
}
return &Snapshot{
Schema: schema,
TableData: tables,
}, nil
}
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