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field_ref.go
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field_ref.go
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package sc
import (
"fmt"
"go/ast"
"go/parser"
"strings"
"time"
"github.com/capillariesio/capillaries/pkg/eval"
"github.com/shopspring/decimal"
)
type FieldRef struct {
TableName string
FieldName string
FieldType TableFieldType
}
func (fr *FieldRef) GetAliasHash() string {
return fmt.Sprintf("%s.%s", fr.TableName, fr.FieldName)
}
type FieldRefs []FieldRef
func (fieldRefs *FieldRefs) HasFieldsWithTableAlias(tableAlias string) bool {
for i := 0; i < len(*fieldRefs); i++ {
if tableAlias == (*fieldRefs)[i].TableName {
return true
}
}
return false
}
func JoinFieldRefs(srcFieldRefs ...*FieldRefs) *FieldRefs {
hashes := map[string](*FieldRef){}
for i := 0; i < len(srcFieldRefs); i++ {
if srcFieldRefs[i] != nil {
for j := 0; j < len(*srcFieldRefs[i]); j++ {
hash := fmt.Sprintf("%s.%s", (*srcFieldRefs[i])[j].TableName, (*srcFieldRefs[i])[j].FieldName)
if _, ok := hashes[hash]; !ok {
hashes[hash] = &(*srcFieldRefs[i])[j]
}
}
}
}
fieldRefs := make(FieldRefs, len(hashes))
fieldRefCount := 0
for _, fieldRef := range hashes {
fieldRefs[fieldRefCount] = *fieldRef
fieldRefCount++
}
return &fieldRefs
}
func RowidFieldRef(tableName string) FieldRef {
return FieldRef{
TableName: tableName,
FieldName: "rowid",
FieldType: FieldTypeInt}
}
func RowidTokenFieldRef() FieldRef {
return FieldRef{
TableName: "db_system",
FieldName: "token(rowid)",
FieldType: FieldTypeInt}
}
// func RunBatchRowidTokenFieldRef() FieldRef {
// return FieldRef{
// TableName: "db_system",
// FieldName: "token(run_id,batch_idx,rowid)",
// FieldType: FieldTypeInt}
// }
func KeyTokenFieldRef() FieldRef {
return FieldRef{
TableName: "db_system",
FieldName: "token(key)",
FieldType: FieldTypeInt}
}
// func RunBatchKeyTokenFieldRef() FieldRef {
// return FieldRef{
// TableName: "db_system",
// FieldName: "token(run_id,batch_idx,key)",
// FieldType: FieldTypeInt}
// }
func IdxKeyFieldRef() FieldRef {
return FieldRef{
TableName: "db_system",
FieldName: "key",
FieldType: FieldTypeString}
}
func (fieldRefs *FieldRefs) contributeUnresolved(tableName string, fieldName string) {
// Check if it's already there
for i := 0; i < len(*fieldRefs); i++ {
if (*fieldRefs)[i].TableName == tableName &&
(*fieldRefs)[i].FieldName == fieldName {
// Already there
return
}
}
*fieldRefs = append(*fieldRefs, FieldRef{TableName: tableName, FieldName: fieldName, FieldType: FieldTypeUnknown})
}
func (fieldRefs *FieldRefs) Append(otherFieldRefs FieldRefs) {
fieldRefs.AppendWithFilter(otherFieldRefs, "")
}
func (fieldRefs *FieldRefs) AppendWithFilter(otherFieldRefs FieldRefs, tableFilter string) {
fieldRefMap := map[string]FieldRef{}
// Existing to map
for i := 0; i < len(*fieldRefs); i++ {
fieldRefMap[(*fieldRefs)[i].GetAliasHash()] = (*fieldRefs)[i]
}
// New to map
for i := 0; i < len(otherFieldRefs); i++ {
if len(tableFilter) == 0 || tableFilter == (otherFieldRefs)[i].TableName {
fieldRefMap[(otherFieldRefs)[i].GetAliasHash()] = (otherFieldRefs)[i]
}
}
*fieldRefs = make([]FieldRef, len(fieldRefMap))
refIdx := 0
for fieldRefHash := range fieldRefMap {
(*fieldRefs)[refIdx] = fieldRefMap[fieldRefHash]
refIdx++
}
}
func evalExpressionWithFieldRefsAndCheckType(exp ast.Expr, fieldRefs FieldRefs, expectedType TableFieldType) error {
if exp == nil {
// Nothing to evaluate
return nil
}
deltaInt := int64(0)
deltaFloat := float64(0)
deltaDecimal := decimal.NewFromFloat(0)
for deltaInt < 5 {
varValuesMap := eval.VarValuesMap{}
for i := 0; i < len(fieldRefs); i++ {
tName := fieldRefs[i].TableName
fName := fieldRefs[i].FieldName
fType := fieldRefs[i].FieldType
if _, ok := varValuesMap[tName]; !ok {
varValuesMap[tName] = map[string]any{}
}
switch fType {
case FieldTypeInt:
varValuesMap[tName][fName] = int64(0) + deltaInt
case FieldTypeFloat:
varValuesMap[tName][fName] = float64(0.0) + deltaFloat
case FieldTypeBool:
varValuesMap[tName][fName] = false
case FieldTypeString:
varValuesMap[tName][fName] = "12345.67" // There may be a float() call out there
case FieldTypeDateTime:
varValuesMap[tName][fName] = time.Now()
case FieldTypeDecimal2:
varValuesMap[tName][fName] = decimal.NewFromFloat(0.0).Add(deltaDecimal)
default:
return fmt.Errorf("evalExpressionWithFieldRefsAndCheckType unsupported field type %s", fieldRefs[i].FieldType)
}
}
funcName, aggFuncEnabled, aggFuncType, aggFuncArgs := eval.DetectRootAggFunc(exp)
eCtx, err := eval.NewPlainEvalCtxWithVarsAndInitializedAgg(funcName, aggFuncEnabled, &varValuesMap, aggFuncType, aggFuncArgs)
if err != nil {
return err
}
result, err := eCtx.Eval(exp)
if err == nil {
return CheckValueType(result, expectedType)
}
if !(strings.Contains(err.Error(), "divide by zero") || // int, float
strings.Contains(err.Error(), "decimal division by 0")) { // decimal
return err
}
deltaInt += int64(1)
deltaFloat += float64(2.35)
deltaDecimal = deltaDecimal.Add(decimal.NewFromFloat(3.45))
}
return fmt.Errorf("unexpectedly keep getting divide by zero error when evalExpressionWithFieldRefsAndCheckType")
}
func (fieldRefs *FieldRefs) FindByFieldName(fieldName string) (*FieldRef, bool) {
for i := 0; i < len(*fieldRefs); i++ {
if fieldName == (*fieldRefs)[i].FieldName {
return &(*fieldRefs)[i], true
}
}
return nil, false
}
func checkAllowed(fieldRefsToCheck *FieldRefs, prohibitedFieldRefs *FieldRefs, allowedFieldRefs *FieldRefs) error {
if fieldRefsToCheck == nil {
return nil
}
// Harvest allowed
allowedHashes := map[string](*FieldRef){}
if allowedFieldRefs != nil {
for i := 0; i < len(*allowedFieldRefs); i++ {
hash := fmt.Sprintf("%s.%s", (*allowedFieldRefs)[i].TableName, (*allowedFieldRefs)[i].FieldName)
if _, ok := allowedHashes[hash]; !ok {
allowedHashes[hash] = &(*allowedFieldRefs)[i]
}
}
}
// Harvest prohibited
prohibitedHashes := map[string](*FieldRef){}
if prohibitedFieldRefs != nil {
for i := 0; i < len(*prohibitedFieldRefs); i++ {
hash := fmt.Sprintf("%s.%s", (*prohibitedFieldRefs)[i].TableName, (*prohibitedFieldRefs)[i].FieldName)
if _, ok := prohibitedHashes[hash]; !ok {
prohibitedHashes[hash] = &(*prohibitedFieldRefs)[i]
}
}
}
errors := make([]string, 0, 2)
for i := 0; i < len(*fieldRefsToCheck); i++ {
if len((*fieldRefsToCheck)[i].TableName) == 0 || len((*fieldRefsToCheck)[i].FieldName) == 0 {
errors = append(errors, fmt.Sprintf("dev error, empty FieldRef %s.%s",
(*fieldRefsToCheck)[i].TableName, (*fieldRefsToCheck)[i].FieldName))
}
hash := fmt.Sprintf("%s.%s", (*fieldRefsToCheck)[i].TableName, (*fieldRefsToCheck)[i].FieldName)
if _, ok := prohibitedHashes[hash]; ok {
errors = append(errors, fmt.Sprintf("prohibited field %s.%s", (*fieldRefsToCheck)[i].TableName, (*fieldRefsToCheck)[i].FieldName))
} else if _, ok := allowedHashes[hash]; !ok {
errors = append(errors, fmt.Sprintf("unknown field %s.%s", (*fieldRefsToCheck)[i].TableName, (*fieldRefsToCheck)[i].FieldName))
} else {
// Update check field type, we will use it later for test eval
(*fieldRefsToCheck)[i].FieldType = allowedHashes[hash].FieldType
}
}
if len(errors) > 0 {
return fmt.Errorf(strings.Join(errors, "; "))
}
return nil
}
type FieldRefParserFlag uint32
func (f FieldRefParserFlag) HasFlag(flag FieldRefParserFlag) bool { return f&flag != 0 }
// Not used for now, maybe later
// func (f *FieldRefParserFlag) AddFlag(flag FieldRefParserFlag) { *f |= flag }
// func (f *FieldRefParserFlag) ClearFlag(flag FieldRefParserFlag) { *f &= ^flag }
// func (f *FieldRefParserFlag) ToggleFlag(flag FieldRefParserFlag) { *f ^= flag }
const (
FieldRefStrict FieldRefParserFlag = 0
FieldRefAllowUnknownIdents FieldRefParserFlag = 1 << iota
FieldRefAllowWhateverFeatureYouAreAddingHere
)
func harvestFieldRefsFromParsedExpression(exp ast.Expr, usedFields *FieldRefs, parserFlags FieldRefParserFlag) error {
switch assertedExp := exp.(type) {
case *ast.BinaryExpr:
if err := harvestFieldRefsFromParsedExpression(assertedExp.X, usedFields, parserFlags); err != nil {
return err
}
return harvestFieldRefsFromParsedExpression(assertedExp.Y, usedFields, parserFlags)
case *ast.UnaryExpr:
return harvestFieldRefsFromParsedExpression(assertedExp.X, usedFields, parserFlags)
case *ast.CallExpr:
for _, v := range assertedExp.Args {
if err := harvestFieldRefsFromParsedExpression(v, usedFields, parserFlags); err != nil {
return err
}
}
case *ast.SelectorExpr:
switch assertedExpIdent := assertedExp.X.(type) {
case *ast.Ident:
_, ok := eval.GolangConstants[fmt.Sprintf("%s.%s", assertedExpIdent.Name, assertedExp.Sel.Name)]
if !ok {
usedFields.contributeUnresolved(assertedExpIdent.Name, assertedExp.Sel.Name)
}
default:
return fmt.Errorf("selectors starting with non-ident are not allowed, found '%v'; aliases to use: readers - '%s', creators - '%s', custom processors - '%s', lookups - '%s'",
assertedExp.X, ReaderAlias, CreatorAlias, CustomProcessorAlias, LookupAlias)
}
case *ast.Ident:
// Keep in mind we may use this parser for Python expressions. Allow unknown constructs for those cases.
if !parserFlags.HasFlag(FieldRefAllowUnknownIdents) {
if assertedExp.Name != "true" && assertedExp.Name != "false" {
return fmt.Errorf("plain (non-selector) identifiers are not allowed, expected field qualifiers (tableor_lkp_alias.field_name), found '%s'; for file readers, use '%s' alias; for file creators, use '%s' alias",
assertedExp.Name, ReaderAlias, CreatorAlias)
}
}
case *ast.ParenExpr:
return harvestFieldRefsFromParsedExpression(assertedExp.X, usedFields, parserFlags)
}
return nil
}
func ParseRawGolangExpressionStringAndHarvestFieldRefs(strExp string, usedFields *FieldRefs) (ast.Expr, error) {
if len(strings.TrimSpace(strExp)) == 0 {
return nil, nil
}
expCondition, err := parser.ParseExpr(strExp)
if err != nil {
return nil, fmt.Errorf("strict parsing error: [%s]", err.Error())
}
if usedFields != nil {
if err := harvestFieldRefsFromParsedExpression(expCondition, usedFields, FieldRefStrict); err != nil {
return nil, err
}
}
return expCondition, nil
}
func ParseRawRelaxedGolangExpressionStringAndHarvestFieldRefs(strExp string, usedFields *FieldRefs, parserFlags FieldRefParserFlag) (ast.Expr, error) {
if len(strings.TrimSpace(strExp)) == 0 {
return nil, nil
}
expCondition, err := parser.ParseExpr(strExp)
if err != nil {
return nil, fmt.Errorf("relaxed parsing error: [%s]", err.Error())
}
if usedFields != nil {
if err := harvestFieldRefsFromParsedExpression(expCondition, usedFields, parserFlags); err != nil {
return nil, err
}
}
return expCondition, nil
}