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build.go
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build.go
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package core
import (
"bytes"
"encoding/json"
"fmt"
"sync"
"github.com/dosco/graphjin/core/internal/psql"
"github.com/dosco/graphjin/core/internal/qcode"
"github.com/go-playground/validator/v10"
)
type queryComp struct {
sync.Once
qr queryReq
st stmt
}
type stmt struct {
role *Role
qc *qcode.QCode
md psql.Metadata
va *validator.Validate
sql string
}
func (gj *graphjin) compileQuery(qr queryReq, role string) (*queryComp, error) {
var qc *queryComp
var err error
var varsFromUser map[string]json.RawMessage
if len(qr.vars) != 0 {
if err := json.Unmarshal(qr.vars, &varsFromUser); err != nil {
return nil, fmt.Errorf("variables: %w", err)
}
}
if gj.allowList == nil || !gj.prod {
st, err := gj.compileQueryRole(qr, varsFromUser, role)
if err != nil {
return nil, err
}
st.va = validator.New()
return &queryComp{qr: qr, st: st}, nil
}
// In production mode enforce the allow list and
// compile and cache the result else compile each time
if qc, err = gj.getQuery(qr, role, varsFromUser); qc == nil {
return nil, err
}
var varsFromAllowList map[string]json.RawMessage
if len(qc.qr.vars) != 0 {
if err := json.Unmarshal(qc.qr.vars, &varsFromAllowList); err != nil {
return nil, fmt.Errorf("variables: %w", err)
}
}
if qc.st.sql == "" {
qc.Do(func() {
qc.st, err = gj.compileQueryRole(qc.qr, varsFromAllowList, role)
qc.st.va = validator.New()
})
}
// Overwrite allow list vars with user vars
qc.qr.vars = qr.vars
qc.qr.ns = qr.ns
return qc, err
}
func (gj *graphjin) compileQueryRole(
qr queryReq, vm map[string]json.RawMessage, role string) (stmt, error) {
var st stmt
var err error
var ok bool
if st.role, ok = gj.roles[role]; !ok {
return st, fmt.Errorf(`roles '%s' not defined in c.gj.config`, role)
}
if qr.order[0] != "" {
vm[qr.order[0]] = json.RawMessage(qr.order[1])
}
if st.qc, err = gj.qc.Compile(qr.query, vm, st.role.Name, qr.ns); err != nil {
return st, err
}
var w bytes.Buffer
if st.md, err = gj.pc.Compile(&w, st.qc); err != nil {
return st, err
}
st.sql = w.String()
return st, nil
}