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delete.go
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delete.go
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package client
import (
"context"
"fmt"
"strings"
"github.com/cloudquery/plugin-sdk/v4/message"
"github.com/cloudquery/plugin-sdk/v4/schema"
"github.com/jackc/pgx/v5"
)
// DeleteStaleBatch deletes stale records from the destination table. It forms part of the writer.MixedBatchWriter interface.
func (c *Client) DeleteStaleBatch(ctx context.Context, messages message.WriteDeleteStales) error {
batch := &pgx.Batch{}
for _, msg := range messages {
var sb strings.Builder
sb.WriteString("delete from ")
sb.WriteString(pgx.Identifier{msg.TableName}.Sanitize())
sb.WriteString(" where ")
sb.WriteString(schema.CqSourceNameColumn.Name)
sb.WriteString(" = $1 and ")
sb.WriteString(schema.CqSyncTimeColumn.Name)
sb.WriteString(" < $2")
batch.Queue(sb.String(), msg.SourceName, msg.SyncTime)
}
br := c.conn.SendBatch(ctx, batch)
if err := br.Close(); err != nil {
return fmt.Errorf("failed to execute batch: %w", err)
}
return nil
}
func (c *Client) DeleteRecordsBatch(ctx context.Context, messages message.WriteDeleteRecords) error {
batch := &pgx.Batch{}
for _, msg := range messages {
sql := generateDeleteCTE(msg.DeleteRecord)
vals := c.extractPredicateValues(msg.DeleteRecord.WhereClause)
batch.Queue(sql, vals...)
}
br := c.conn.SendBatch(ctx, batch)
if err := br.Close(); err != nil {
return fmt.Errorf("failed to execute batch: %w", err)
}
return nil
}
func generateInitialDelete(tableName string, whereClause message.PredicateGroups) string {
var sb strings.Builder
sb.WriteString("DELETE from ")
sb.WriteString(pgx.Identifier{tableName}.Sanitize())
if len(whereClause) > 0 {
sb.WriteString(" where ")
counter := 1
for i, predicateGroup := range whereClause {
if len(predicateGroup.Predicates) == 0 {
continue
}
sb.WriteString("( ")
for i, predicate := range predicateGroup.Predicates {
if i > 0 {
sb.WriteString(fmt.Sprintf(" %s ", predicateGroup.GroupingType))
}
sb.WriteString(pgx.Identifier{predicate.Column}.Sanitize())
sb.WriteString(fmt.Sprintf(" = $%d", counter))
counter++
}
sb.WriteString(" )")
if i < len(whereClause)-1 {
sb.WriteString(" AND ")
}
}
}
sb.WriteString(" RETURNING *")
return sb.String()
}
func generateRelationsDelete(tableRelation message.TableRelation) string {
var sb strings.Builder
sb.WriteString("DELETE from ")
sb.WriteString(pgx.Identifier{tableRelation.TableName}.Sanitize())
sb.WriteString(" where ")
sb.WriteString(pgx.Identifier{schema.CqParentIDColumn.Name}.Sanitize())
sb.WriteString(" in (select ")
sb.WriteString(pgx.Identifier{schema.CqIDColumn.Name}.Sanitize())
sb.WriteString(" from ")
sb.WriteString(pgx.Identifier{tableRelation.ParentTable + "_CTE"}.Sanitize())
sb.WriteString(")")
return sb.String()
}
func generateDeleteCTE(deleteRecord message.DeleteRecord) string {
tables := make([]string, len(deleteRecord.TableRelations))
initialDelete := generateInitialDelete(deleteRecord.TableName, deleteRecord.WhereClause)
var sb strings.Builder
sb.WriteString("WITH ")
sb.WriteString(pgx.Identifier{deleteRecord.TableName + "_CTE"}.Sanitize())
sb.WriteString(" AS (")
sb.WriteString(initialDelete)
sb.WriteString(") ")
for i, tableRelation := range deleteRecord.TableRelations {
sb.WriteString(", ")
sb.WriteString(pgx.Identifier{tableRelation.TableName + "_CTE"}.Sanitize())
sb.WriteString(" AS (")
sb.WriteString(generateRelationsDelete(tableRelation))
sb.WriteString(" RETURNING ")
sb.WriteString(pgx.Identifier{schema.CqIDColumn.Name}.Sanitize())
sb.WriteString(") ")
tables[i] = tableRelation.TableName
}
for _, table := range tables {
sb.WriteString("Select count(*) from ")
sb.WriteString(pgx.Identifier{table + "_CTE"}.Sanitize())
sb.WriteString(" UNION ALL ")
}
sb.WriteString("Select count(*) from ")
sb.WriteString(pgx.Identifier{deleteRecord.TableName + "_CTE"}.Sanitize())
return sb.String()
}
func (c *Client) extractPredicateValues(where message.PredicateGroups) []any {
predicateCount := 0
for _, predicateGroup := range where {
predicateCount += len(predicateGroup.Predicates)
}
results := make([]any, predicateCount)
counter := 0
for _, predicateGroup := range where {
for _, predicate := range predicateGroup.Predicates {
col := predicate.Record.Column(0)
transformed := c.transformArr(col)
results[counter] = transformed[0]
counter++
}
}
return results
}