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prebackup.go
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prebackup.go
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package prebackup
import (
"context"
"database/sql"
"fmt"
"github.com/lib/pq"
)
// Handler alters a jobsdb table before backup happens
type Handler interface {
Handle(ctx context.Context, txn *sql.Tx, jobsTable, jobStatusTable string) error
}
// DropSourceIds provides a pre-backup handler who is responsible for removing events
// from the tables which belong to a transient source id.
// The list of source ids is dynamically provided by the transientSourceIds function
func DropSourceIds(transientSourceIds func() []string) Handler {
return &dropSourceIds{
transientSourceIds: transientSourceIds,
}
}
type dropSourceIds struct {
transientSourceIds func() []string
}
func (r *dropSourceIds) Handle(ctx context.Context, txn *sql.Tx, jobsTable, jobStatusTable string) error {
sourceIds := r.transientSourceIds()
if len(sourceIds) == 0 {
// skip
return nil
}
sourceIdsParam := pq.Array(r.transientSourceIds())
// First cleanup events from the job status table since it relies on the jobs table
jsSql := fmt.Sprintf(`DELETE FROM "%[1]s" WHERE job_id IN (SELECT job_id FROM "%[2]s" WHERE parameters->>'source_id' = ANY ($1))`, jobStatusTable, jobsTable)
jsStmt, err := txn.Prepare(jsSql)
if err != nil {
return fmt.Errorf("could not prepare delete statement: %w", err)
}
_, err = jsStmt.ExecContext(ctx, sourceIdsParam)
if err != nil {
return fmt.Errorf("could not delete transient source events from table %s: %w", jobStatusTable, err)
}
// Last cleanup events from the jobs table
jSql := fmt.Sprintf(`DELETE FROM "%[1]s" WHERE parameters->>'source_id' = ANY($1)`, jobsTable)
jStmt, err := txn.Prepare(jSql)
if err != nil {
return fmt.Errorf("could not delete transient source events from table %s: %w", jobsTable, err)
}
_, err = jStmt.ExecContext(ctx, sourceIdsParam)
if err != nil {
return err
}
return nil
}