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queries.go
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queries.go
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package server
import (
"context"
"fmt"
"sync"
"time"
jsonvalue "github.com/Andrew-M-C/go.jsonvalue"
runtimev1 "github.com/rilldata/rill/proto/gen/rill/runtime/v1"
"github.com/rilldata/rill/runtime/drivers"
"github.com/rilldata/rill/runtime/pkg/pbutil"
"github.com/rilldata/rill/runtime/server/auth"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"google.golang.org/protobuf/types/known/structpb"
)
var mutex sync.Mutex
func unmarshalJSON(sql []byte) (*jsonvalue.V, error) {
mutex.Lock()
defer mutex.Unlock()
return jsonvalue.Unmarshal(sql)
}
// Query implements QueryService.
func (s *Server) Query(ctx context.Context, req *runtimev1.QueryRequest) (*runtimev1.QueryResponse, error) {
if !auth.GetClaims(ctx).CanInstance(req.InstanceId, auth.ReadOLAP) {
return nil, ErrForbidden
}
args := make([]any, len(req.Args))
for i, arg := range req.Args {
args[i] = arg.AsInterface()
}
olap, release, err := s.runtime.OLAP(ctx, req.InstanceId)
if err != nil {
return nil, err
}
defer release()
transformedSQL := req.Sql
if req.Limit != 0 {
transformedSQL, err = ensureLimits(ctx, olap, req.Sql, int(req.Limit))
if err != nil {
return nil, err
}
}
res, err := olap.Execute(ctx, &drivers.Statement{
Query: transformedSQL,
Args: args,
DryRun: req.DryRun,
Priority: int(req.Priority),
ExecutionTimeout: 2 * time.Minute,
})
if err != nil {
// TODO: Parse error to determine error code
return nil, status.Error(codes.InvalidArgument, err.Error())
}
// NOTE: Currently, query returns nil res for successful dry-run queries
if req.DryRun {
// TODO: Return a meta object for dry-run queries
return &runtimev1.QueryResponse{}, nil
}
defer res.Close()
data, err := rowsToData(res)
if err != nil {
return nil, status.Error(codes.Internal, err.Error())
}
resp := &runtimev1.QueryResponse{
Meta: res.Schema,
Data: data,
}
return resp, nil
}
func rowsToData(rows *drivers.Result) ([]*structpb.Struct, error) {
var data []*structpb.Struct
for rows.Next() {
rowMap := make(map[string]any)
err := rows.MapScan(rowMap)
if err != nil {
return nil, err
}
rowStruct, err := pbutil.ToStruct(rowMap, rows.Schema)
if err != nil {
return nil, err
}
data = append(data, rowStruct)
}
err := rows.Err()
if err != nil {
return nil, err
}
return data, nil
}
func ensureLimits(ctx context.Context, olap drivers.OLAPStore, inputSQL string, limit int) (string, error) {
r, err := olap.Execute(ctx, &drivers.Statement{
Query: "select json_serialize_sql(?::VARCHAR)",
Args: []any{inputSQL},
})
if err != nil {
return "", err
}
var serializedSQL []byte
if r.Next() {
err = r.Scan(&serializedSQL)
if err != nil {
r.Close()
return "", err
}
}
r.Close()
v, err := unmarshalJSON(serializedSQL)
if err != nil {
return "", err
}
err = transformStatments(v, limit)
if err != nil {
return "", err
}
transformedJSON := v.MustMarshalString()
r, err = olap.Execute(ctx, &drivers.Statement{
Query: "select json_deserialize_sql(json(?))",
Args: []any{transformedJSON},
})
if err != nil {
return "", err
}
var sqlString string
if r.Next() {
err = r.Scan(&sqlString)
if err != nil {
r.Close()
return "", err
}
}
r.Close()
return sqlString, nil
}
func transformStatments(root *jsonvalue.V, limit int) error {
for _, v := range root.MustGet("statements").ForRangeArr() {
err := replaceOrUpdateLimitTo(v.MustGet("node").MustGet("modifiers"), limit)
if err != nil {
return err
}
}
return nil
}
/*
"LIMIT 1" clause is serialized to the following JSON:
"modifiers":[
{
"type":"LIMIT_MODIFIER",
"limit":{
"class":"CONSTANT",
"type":"VALUE_CONSTANT",
"alias":"",
"value":{
"type":{
"id":"INTEGER",
"type_info":null
},
"is_null":false,
"value":1
}
},
"offset":null
},
]
"LIMIT ?" clause serialization is:
{
"type":"LIMIT_MODIFIER",
"limit":{
"class":"PARAMETER",
"type":"VALUE_PARAMETER",
"alias":"",
"parameter_nr":2
},
"offset":null
}
*/
func replaceOrUpdateLimitTo(root *jsonvalue.V, limit int) error {
children := root.ForRangeArr()
updated := false
if len(children) != 0 {
for _, v := range children {
if v.MustGet("type").String() == "LIMIT_MODIFIER" {
modifierType := v.MustGet("limit").MustGet("class").String()
switch modifierType {
case "CONSTANT":
v.MustGet("limit").MustGet("value").MustSetInt(limit).At("value")
updated = true
case "PARAMETER":
err := v.Delete("limit")
if err != nil {
return err
}
limitObject, err := createConstantLimit(limit)
if err != nil {
return err
}
v.MustSet(limitObject).At("limit")
updated = true
}
}
}
}
if !updated {
v, err := createLimitModifier(limit)
if err != nil {
return err
}
_, err = root.Append(v).InTheEnd()
if err != nil {
return err
}
}
return nil
}
func createConstantLimit(limit int) (*jsonvalue.V, error) {
return unmarshalJSON([]byte(fmt.Sprintf(`
{
"class":"CONSTANT",
"type":"VALUE_CONSTANT",
"alias":"",
"value":{
"type":{
"id":"INTEGER",
"type_info":null
},
"is_null":false,
"value":%d
}
}
`, limit)))
}
func createLimitModifier(limit int) (*jsonvalue.V, error) {
return unmarshalJSON([]byte(fmt.Sprintf(`
{
"type":"LIMIT_MODIFIER",
"limit":{
"class":"CONSTANT",
"type":"VALUE_CONSTANT",
"alias":"",
"value":{
"type":{
"id":"INTEGER",
"type_info":null
},
"is_null":false,
"value":%d
}
},
"offset":null
}
`, limit)))
}