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/
conn_info.go
96 lines (79 loc) · 1.91 KB
/
conn_info.go
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package replicator
import (
"github.com/jackc/pgx"
"github.com/jackc/pgx/pgtype"
)
func initPostgresql(conn *pgx.Conn) (*pgtype.ConnInfo, error) {
const (
namedOIDQuery = `select t.oid,
case when nsp.nspname in ('pg_catalog', 'public') then t.typname
else nsp.nspname||'.'||t.typname
end
from pg_type t
left join pg_type base_type on t.typelem=base_type.oid
left join pg_namespace nsp on t.typnamespace=nsp.oid
where (
t.typtype in('b', 'p', 'r', 'e')
and (base_type.oid is null or base_type.typtype in('b', 'p', 'r'))
)`
)
nameOIDs, err := connInfoFromRows(conn.Query(namedOIDQuery))
if err != nil {
return nil, err
}
cinfo := pgtype.NewConnInfo()
cinfo.InitializeDataTypes(nameOIDs)
if err = initConnInfoEnumArray(conn, cinfo); err != nil {
return nil, err
}
return cinfo, nil
}
func initConnInfoEnumArray(conn *pgx.Conn, cinfo *pgtype.ConnInfo) error {
nameOIDs := make(map[string]pgtype.OID, 16)
rows, err := conn.Query(`select t.oid, t.typname
from pg_type t
join pg_type base_type on t.typelem=base_type.oid
where t.typtype = 'b'
and base_type.typtype = 'e'`)
if err != nil {
return err
}
for rows.Next() {
var oid pgtype.OID
var name pgtype.Text
if err := rows.Scan(&oid, &name); err != nil {
return err
}
nameOIDs[name.String] = oid
}
if rows.Err() != nil {
return rows.Err()
}
for name, oid := range nameOIDs {
cinfo.RegisterDataType(pgtype.DataType{
Value: &pgtype.EnumArray{},
Name: name,
OID: oid,
})
}
return nil
}
func connInfoFromRows(rows *pgx.Rows, err error) (map[string]pgtype.OID, error) {
if err != nil {
return nil, err
}
defer rows.Close()
nameOIDs := make(map[string]pgtype.OID, 256)
for rows.Next() {
var oid pgtype.OID
var name pgtype.Text
if err = rows.Scan(&oid, &name); err != nil {
return nil, err
}
nameOIDs[name.String] = oid
}
if err = rows.Err(); err != nil {
return nil, err
}
return nameOIDs, err
}