/
hsql.go
58 lines (46 loc) · 1.05 KB
/
hsql.go
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package hsql
import (
"strings"
"github.com/rqlite/sql"
"github.com/temphia/temphia/code/backend/libx/easyerr"
"github.com/temphia/temphia/code/backend/stores/upper/dyndb/tns"
)
type Result struct {
InverseAlias map[string]string
TransformedQuery string
}
type Hsql struct {
tns tns.TNS
}
func New(tns tns.TNS) *Hsql {
return &Hsql{
tns: tns,
}
}
func (h *Hsql) Transform(tenantId, group string, allowedTables []string, query string) (*Result, error) {
parser := sql.NewParser(strings.NewReader(query))
stmt, err := parser.ParseStatement()
if err != nil {
return nil, err
}
switch stmt.(type) {
case *sql.SelectStatement:
default:
return nil, easyerr.Error("invalid statement type")
}
v := &HsqlVisitor{
tenantId: tenantId,
group: group,
tns: h.tns,
allowedTables: allowedTables,
inverseAliasMap: make(map[string]string),
}
err = (sql.Walk(v, stmt))
if err != nil {
return nil, err
}
return &Result{
InverseAlias: v.inverseAliasMap,
TransformedQuery: stmt.String(),
}, nil
}