105 lines
1.7 KiB
Go
105 lines
1.7 KiB
Go
package serv
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import (
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"bytes"
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"context"
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"encoding/json"
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"fmt"
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"io"
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"github.com/dosco/super-graph/psql"
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"github.com/dosco/super-graph/qcode"
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"github.com/jackc/pgconn"
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"github.com/valyala/fasttemplate"
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)
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type preparedItem struct {
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stmt *pgconn.StatementDescription
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args [][]byte
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skipped uint32
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qc *qcode.QCode
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}
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var (
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_preparedList map[string]*preparedItem
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)
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func initPreparedList() {
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_preparedList = make(map[string]*preparedItem)
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for k, v := range _allowList.list {
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err := prepareStmt(k, v.gql, v.vars)
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if err != nil {
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panic(err)
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}
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}
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}
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func prepareStmt(key, gql string, varBytes json.RawMessage) error {
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if len(gql) == 0 || len(key) == 0 {
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return nil
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}
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qc, err := qcompile.Compile([]byte(gql))
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if err != nil {
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return err
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}
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var vars map[string]json.RawMessage
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if len(varBytes) != 0 {
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vars = make(map[string]json.RawMessage)
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if err := json.Unmarshal(varBytes, &vars); err != nil {
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return err
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}
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}
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buf := &bytes.Buffer{}
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skipped, err := pcompile.Compile(qc, buf, psql.Variables(vars))
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if err != nil {
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return err
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}
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t := fasttemplate.New(buf.String(), `{{`, `}}`)
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am := make([][]byte, 0, 5)
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i := 0
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finalSQL := t.ExecuteFuncString(func(w io.Writer, tag string) (int, error) {
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am = append(am, []byte(tag))
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i++
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return w.Write([]byte(fmt.Sprintf("$%d", i)))
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})
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if err != nil {
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return err
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}
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ctx := context.Background()
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tx, err := db.Begin(ctx)
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if err != nil {
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return err
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}
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defer tx.Rollback(ctx)
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pstmt, err := tx.Prepare(ctx, "", finalSQL)
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if err != nil {
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return err
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}
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_preparedList[key] = &preparedItem{
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stmt: pstmt,
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args: am,
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skipped: skipped,
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qc: qc,
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}
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if err := tx.Commit(ctx); err != nil {
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return err
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}
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return nil
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}
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