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queryParser.go
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queryParser.go
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// Copyright (c) 2020 Uber Technologies, Inc.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
//go:generate mockgen -package $GOPACKAGE -source queryParser.go -destination queryParser_mock.go -mock_names Interface=MockQueryParser
package s3store
import (
"errors"
"fmt"
"strconv"
"time"
"github.com/xwb1989/sqlparser"
"github.com/uber/cadence/common"
)
type (
// QueryParser parses a limited SQL where clause into a struct
QueryParser interface {
Parse(query string) (*parsedQuery, error)
}
queryParser struct{}
parsedQuery struct {
workflowTypeName *string
workflowID *string
startTime *int64
closeTime *int64
searchPrecision *string
}
)
// All allowed fields for filtering
const (
WorkflowTypeName = "WorkflowTypeName"
WorkflowID = "WorkflowID"
StartTime = "StartTime"
CloseTime = "CloseTime"
SearchPrecision = "SearchPrecision"
)
// Precision specific values
const (
PrecisionDay = "Day"
PrecisionHour = "Hour"
PrecisionMinute = "Minute"
PrecisionSecond = "Second"
)
const (
queryTemplate = "select * from dummy where %s"
defaultDateTimeFormat = time.RFC3339
)
// NewQueryParser creates a new query parser for filestore
func NewQueryParser() QueryParser {
return &queryParser{}
}
func (p *queryParser) Parse(query string) (*parsedQuery, error) {
stmt, err := sqlparser.Parse(fmt.Sprintf(queryTemplate, query))
if err != nil {
return nil, err
}
whereExpr := stmt.(*sqlparser.Select).Where.Expr
parsedQuery := &parsedQuery{}
if err := p.convertWhereExpr(whereExpr, parsedQuery); err != nil {
return nil, err
}
if parsedQuery.workflowID == nil && parsedQuery.workflowTypeName == nil {
return nil, errors.New("WorkflowID or WorkflowTypeName is required in query")
}
if parsedQuery.workflowID != nil && parsedQuery.workflowTypeName != nil {
return nil, errors.New("only one of WorkflowID or WorkflowTypeName can be specified in a query")
}
if parsedQuery.closeTime != nil && parsedQuery.startTime != nil {
return nil, errors.New("only one of StartTime or CloseTime can be specified in a query")
}
if (parsedQuery.closeTime != nil || parsedQuery.startTime != nil) && parsedQuery.searchPrecision == nil {
return nil, errors.New("SearchPrecision is required when searching for a StartTime or CloseTime")
}
if parsedQuery.closeTime == nil && parsedQuery.startTime == nil && parsedQuery.searchPrecision != nil {
return nil, errors.New("SearchPrecision requires a StartTime or CloseTime")
}
return parsedQuery, nil
}
func (p *queryParser) convertWhereExpr(expr sqlparser.Expr, parsedQuery *parsedQuery) error {
if expr == nil {
return errors.New("where expression is nil")
}
switch expr := expr.(type) {
case *sqlparser.ComparisonExpr:
return p.convertComparisonExpr(expr, parsedQuery)
case *sqlparser.AndExpr:
return p.convertAndExpr(expr, parsedQuery)
case *sqlparser.ParenExpr:
return p.convertParenExpr(expr, parsedQuery)
default:
return errors.New("only comparison and \"and\" expression is supported")
}
}
func (p *queryParser) convertParenExpr(parenExpr *sqlparser.ParenExpr, parsedQuery *parsedQuery) error {
return p.convertWhereExpr(parenExpr.Expr, parsedQuery)
}
func (p *queryParser) convertAndExpr(andExpr *sqlparser.AndExpr, parsedQuery *parsedQuery) error {
if err := p.convertWhereExpr(andExpr.Left, parsedQuery); err != nil {
return err
}
return p.convertWhereExpr(andExpr.Right, parsedQuery)
}
func (p *queryParser) convertComparisonExpr(compExpr *sqlparser.ComparisonExpr, parsedQuery *parsedQuery) error {
colName, ok := compExpr.Left.(*sqlparser.ColName)
if !ok {
return fmt.Errorf("invalid filter name: %s", sqlparser.String(compExpr.Left))
}
colNameStr := sqlparser.String(colName)
op := compExpr.Operator
valExpr, ok := compExpr.Right.(*sqlparser.SQLVal)
if !ok {
return fmt.Errorf("invalid value: %s", sqlparser.String(compExpr.Right))
}
valStr := sqlparser.String(valExpr)
switch colNameStr {
case WorkflowTypeName:
val, err := extractStringValue(valStr)
if err != nil {
return err
}
if op != "=" {
return fmt.Errorf("only operator = is supported for %s with Amazon S3", WorkflowTypeName)
}
if parsedQuery.workflowTypeName != nil {
return fmt.Errorf("can not query %s multiple times", WorkflowTypeName)
}
parsedQuery.workflowTypeName = common.StringPtr(val)
case WorkflowID:
val, err := extractStringValue(valStr)
if err != nil {
return err
}
if op != "=" {
return fmt.Errorf("only operator = is supported for %s with Amazon S3", WorkflowID)
}
if parsedQuery.workflowID != nil {
return fmt.Errorf("can not query %s multiple times", WorkflowID)
}
parsedQuery.workflowID = common.StringPtr(val)
case CloseTime:
timestamp, err := convertToTimestamp(valStr)
if err != nil {
return err
}
if op != "=" {
return fmt.Errorf("only operator = is supported for %s with Amazon S3", CloseTime)
}
parsedQuery.closeTime = ×tamp
case StartTime:
timestamp, err := convertToTimestamp(valStr)
if err != nil {
return err
}
if op != "=" {
return fmt.Errorf("only operator = is supported for %s with Amazon S3", StartTime)
}
parsedQuery.startTime = ×tamp
case SearchPrecision:
val, err := extractStringValue(valStr)
if err != nil {
return err
}
if op != "=" {
return fmt.Errorf("only operator = is supported for %s with Amazon S3", SearchPrecision)
}
if parsedQuery.searchPrecision != nil && *parsedQuery.searchPrecision != val {
return fmt.Errorf("only one expression is allowed for %s", SearchPrecision)
}
switch val {
case PrecisionDay:
case PrecisionHour:
case PrecisionMinute:
case PrecisionSecond:
default:
return fmt.Errorf("invalid value for %s: %s", SearchPrecision, val)
}
parsedQuery.searchPrecision = common.StringPtr(val)
default:
return fmt.Errorf("unknown filter name: %s", colNameStr)
}
return nil
}
func convertToTimestamp(timeStr string) (int64, error) {
timestamp, err := strconv.ParseInt(timeStr, 10, 64)
if err == nil {
return timestamp, nil
}
timestampStr, err := extractStringValue(timeStr)
if err != nil {
return 0, err
}
parsedTime, err := time.Parse(defaultDateTimeFormat, timestampStr)
if err != nil {
return 0, err
}
return parsedTime.UnixNano(), nil
}
func extractStringValue(s string) (string, error) {
if len(s) >= 2 && s[0] == '\'' && s[len(s)-1] == '\'' {
return s[1 : len(s)-1], nil
}
return "", fmt.Errorf("value %s is not a string value", s)
}