super-graph/qcode/qcode.go

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package qcode
import (
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"errors"
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"fmt"
"strings"
"sync"
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"github.com/dosco/super-graph/util"
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"github.com/gobuffalo/flect"
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)
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type QType int
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const (
maxSelectors = 30
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QTQuery QType = iota + 1
QTMutation
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)
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type QCode struct {
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Type QType
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Selects []Select
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}
type Column struct {
Table string
Name string
FieldName string
}
type Select struct {
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ID int32
ParentID int32
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Args map[string]*Node
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Table string
FieldName string
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Cols []Column
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Where *Exp
OrderBy []*OrderBy
DistinctOn []string
Paging Paging
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Children []int32
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}
type Exp struct {
Op ExpOp
Col string
NestedCol bool
Type ValType
Val string
ListType ValType
ListVal []string
Children []*Exp
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childrenA [5]*Exp
doFree bool
}
var zeroExp = Exp{doFree: true}
func (ex *Exp) Reset() {
*ex = zeroExp
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}
type OrderBy struct {
Col string
Order Order
}
type Paging struct {
Limit string
Offset string
}
type ExpOp int
const (
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OpNop ExpOp = iota
OpAnd
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OpOr
OpNot
OpEquals
OpNotEquals
OpGreaterOrEquals
OpLesserOrEquals
OpGreaterThan
OpLesserThan
OpIn
OpNotIn
OpLike
OpNotLike
OpILike
OpNotILike
OpSimilar
OpNotSimilar
OpContains
OpContainedIn
OpHasKey
OpHasKeyAny
OpHasKeyAll
OpIsNull
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OpEqID
OpTsQuery
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)
type ValType int
const (
ValStr ValType = iota + 1
ValInt
ValFloat
ValBool
ValList
ValVar
ValNone
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)
type AggregrateOp int
const (
AgCount AggregrateOp = iota + 1
AgSum
AgAvg
AgMax
AgMin
)
type Order int
const (
OrderAsc Order = iota + 1
OrderDesc
OrderAscNullsFirst
OrderAscNullsLast
OrderDescNullsFirst
OrderDescNullsLast
)
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type Config struct {
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DefaultFilter []string
FilterMap map[string][]string
Blacklist []string
KeepArgs bool
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}
type Compiler struct {
fl *Exp
fm map[string]*Exp
bl map[string]struct{}
ka bool
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}
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var opMap = map[parserType]QType{
opQuery: QTQuery,
opMutate: QTMutation,
}
var expPool = sync.Pool{
New: func() interface{} { return new(Exp) },
}
func NewCompiler(c Config) (*Compiler, error) {
bl := make(map[string]struct{}, len(c.Blacklist))
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for i := range c.Blacklist {
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bl[c.Blacklist[i]] = struct{}{}
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}
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fl, err := compileFilter(c.DefaultFilter)
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if err != nil {
return nil, err
}
fm := make(map[string]*Exp, len(c.FilterMap))
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for k, v := range c.FilterMap {
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fil, err := compileFilter(v)
if err != nil {
return nil, err
}
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singular := flect.Singularize(k)
plural := flect.Pluralize(k)
fm[singular] = fil
fm[plural] = fil
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}
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seedExp := [100]Exp{}
for i := range seedExp {
expPool.Put(&seedExp[i])
}
return &Compiler{fl, fm, bl, c.KeepArgs}, nil
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}
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func (com *Compiler) Compile(query []byte) (*QCode, error) {
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var qc QCode
var err error
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op, err := Parse(query)
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if err != nil {
return nil, err
}
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qc.Selects, err = com.compileQuery(op)
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if err != nil {
return nil, err
}
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if t, ok := opMap[op.Type]; ok {
qc.Type = t
} else {
return nil, fmt.Errorf("Unknown operation type %d", op.Type)
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}
opPool.Put(op)
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return &qc, nil
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}
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func (com *Compiler) compileQuery(op *Operation) ([]Select, error) {
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id := int32(0)
parentID := int32(0)
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selects := make([]Select, 0, 5)
st := NewStack()
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if len(op.Fields) == 0 {
return nil, errors.New("empty query")
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}
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st.Push(op.Fields[0].ID)
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for {
if st.Len() == 0 {
break
}
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if id >= maxSelectors {
return nil, fmt.Errorf("selector limit reached (%d)", maxSelectors)
}
fid := st.Pop()
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field := &op.Fields[fid]
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if _, ok := com.bl[field.Name]; ok {
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continue
}
selects = append(selects, Select{
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ID: id,
ParentID: parentID,
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Table: field.Name,
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Children: make([]int32, 0, 5),
})
s := &selects[(len(selects) - 1)]
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if s.ID != 0 {
p := &selects[s.ParentID]
p.Children = append(p.Children, s.ID)
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}
if len(field.Alias) != 0 {
s.FieldName = field.Alias
} else {
s.FieldName = s.Table
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}
err := com.compileArgs(s, field.Args)
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if err != nil {
return nil, err
}
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s.Cols = make([]Column, 0, len(field.Children))
for _, cid := range field.Children {
f := op.Fields[cid]
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if _, ok := com.bl[f.Name]; ok {
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continue
}
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if len(f.Children) != 0 {
parentID = s.ID
st.Push(f.ID)
continue
}
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col := Column{Name: f.Name}
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if len(f.Alias) != 0 {
col.FieldName = f.Alias
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} else {
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col.FieldName = f.Name
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}
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s.Cols = append(s.Cols, col)
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}
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id++
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}
var ok bool
var fil *Exp
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if id > 0 {
root := &selects[0]
fil, ok = com.fm[root.Table]
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if !ok || fil == nil {
fil = com.fl
}
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if fil != nil && fil.Op != OpNop {
if root.Where != nil {
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ow := root.Where
root.Where = expPool.Get().(*Exp)
root.Where.Reset()
root.Where.Op = OpAnd
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root.Where.Children = root.Where.childrenA[:2]
root.Where.Children[0] = fil
root.Where.Children[1] = ow
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} else {
root.Where = fil
}
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}
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} else {
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return nil, errors.New("invalid query")
}
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return selects[:id], nil
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}
func (com *Compiler) compileArgs(sel *Select, args []Arg) error {
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var err error
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if com.ka {
sel.Args = make(map[string]*Node, len(args))
}
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for i := range args {
arg := &args[i]
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switch arg.Name {
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case "id":
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if sel.ID == 0 {
err = com.compileArgID(sel, arg)
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}
case "search":
err = com.compileArgSearch(sel, arg)
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case "where":
err = com.compileArgWhere(sel, arg)
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case "orderby", "order_by", "order":
err = com.compileArgOrderBy(sel, arg)
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case "distinct_on", "distinct":
err = com.compileArgDistinctOn(sel, arg)
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case "limit":
err = com.compileArgLimit(sel, arg)
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case "offset":
err = com.compileArgOffset(sel, arg)
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}
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if err != nil {
return err
}
if sel.Args != nil {
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sel.Args[arg.Name] = arg.Val
} else {
nodePool.Put(arg.Val)
}
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}
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return nil
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}
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func (com *Compiler) compileArgObj(st *util.Stack, arg *Arg) (*Exp, error) {
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if arg.Val.Type != nodeObj {
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return nil, fmt.Errorf("expecting an object")
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}
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return com.compileArgNode(st, arg.Val, true)
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}
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func (com *Compiler) compileArgNode(st *util.Stack, node *Node, usePool bool) (*Exp, error) {
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var root *Exp
if node == nil || len(node.Children) == 0 {
return nil, errors.New("invalid argument value")
}
pushChild(st, nil, node)
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for {
if st.Len() == 0 {
break
}
intf := st.Pop()
node, ok := intf.(*Node)
if !ok || node == nil {
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return nil, fmt.Errorf("16: unexpected value %v (%t)", intf, intf)
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}
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// Objects inside a list
if len(node.Name) == 0 {
pushChildren(st, node.exp, node)
continue
} else {
if _, ok := com.bl[node.Name]; ok {
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continue
}
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}
ex, err := newExp(st, node, usePool)
if err != nil {
return nil, err
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}
if ex == nil {
continue
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}
if node.exp == nil {
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root = ex
} else {
node.exp.Children = append(node.exp.Children, ex)
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}
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}
if com.ka {
return root, nil
}
pushChild(st, nil, node)
for {
if st.Len() == 0 {
break
}
intf := st.Pop()
node, _ := intf.(*Node)
for i := range node.Children {
st.Push(node.Children[i])
}
nodePool.Put(node)
}
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return root, nil
}
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func (com *Compiler) compileArgID(sel *Select, arg *Arg) error {
if sel.Where != nil && sel.Where.Op == OpEqID {
return nil
}
ex := expPool.Get().(*Exp)
ex.Reset()
ex.Op = OpEqID
ex.Val = arg.Val.Val
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switch arg.Val.Type {
case nodeStr:
ex.Type = ValStr
case nodeInt:
ex.Type = ValInt
case nodeFloat:
ex.Type = ValFloat
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case nodeVar:
ex.Type = ValVar
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default:
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fmt.Errorf("expecting a string, int, float or variable")
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}
sel.Where = ex
return nil
}
func (com *Compiler) compileArgSearch(sel *Select, arg *Arg) error {
ex := expPool.Get().(*Exp)
ex.Reset()
ex.Op = OpTsQuery
ex.Type = ValStr
ex.Val = arg.Val.Val
if sel.Where != nil {
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ow := sel.Where
sel.Where = expPool.Get().(*Exp)
sel.Where.Reset()
sel.Where.Op = OpAnd
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sel.Where.Children = sel.Where.childrenA[:2]
sel.Where.Children[0] = ex
sel.Where.Children[1] = ow
} else {
sel.Where = ex
}
return nil
}
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func (com *Compiler) compileArgWhere(sel *Select, arg *Arg) error {
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st := util.NewStack()
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var err error
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ex, err := com.compileArgObj(st, arg)
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if err != nil {
return err
}
if sel.Where != nil {
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ow := sel.Where
sel.Where = expPool.Get().(*Exp)
sel.Where.Reset()
sel.Where.Op = OpAnd
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sel.Where.Children = sel.Where.childrenA[:2]
sel.Where.Children[0] = ex
sel.Where.Children[1] = ow
} else {
sel.Where = ex
}
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return nil
}
func (com *Compiler) compileArgOrderBy(sel *Select, arg *Arg) error {
if arg.Val.Type != nodeObj {
return fmt.Errorf("expecting an object")
}
st := util.NewStack()
for i := range arg.Val.Children {
st.Push(arg.Val.Children[i])
}
for {
if st.Len() == 0 {
break
}
intf := st.Pop()
node, ok := intf.(*Node)
if !ok || node == nil {
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return fmt.Errorf("17: unexpected value %v (%t)", intf, intf)
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}
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if _, ok := com.bl[node.Name]; ok {
if !com.ka {
nodePool.Put(node)
}
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continue
}
if node.Type == nodeObj {
for i := range node.Children {
st.Push(node.Children[i])
}
if !com.ka {
nodePool.Put(node)
}
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continue
}
ob := &OrderBy{}
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switch node.Val {
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case "asc":
ob.Order = OrderAsc
case "desc":
ob.Order = OrderDesc
case "asc_nulls_first":
ob.Order = OrderAscNullsFirst
case "desc_nulls_first":
ob.Order = OrderDescNullsFirst
case "asc_nulls_last":
ob.Order = OrderAscNullsLast
case "desc_nulls_last":
ob.Order = OrderDescNullsLast
default:
return fmt.Errorf("valid values include asc, desc, asc_nulls_first and desc_nulls_first")
}
setOrderByColName(ob, node)
sel.OrderBy = append(sel.OrderBy, ob)
if !com.ka {
nodePool.Put(node)
}
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}
return nil
}
func (com *Compiler) compileArgDistinctOn(sel *Select, arg *Arg) error {
node := arg.Val
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if _, ok := com.bl[node.Name]; ok {
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return nil
}
if node.Type != nodeList && node.Type != nodeStr {
return fmt.Errorf("expecting a list of strings or just a string")
}
if node.Type == nodeStr {
sel.DistinctOn = append(sel.DistinctOn, node.Val)
}
for i := range node.Children {
sel.DistinctOn = append(sel.DistinctOn, node.Children[i].Val)
if !com.ka {
nodePool.Put(node.Children[i])
}
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}
return nil
}
func (com *Compiler) compileArgLimit(sel *Select, arg *Arg) error {
node := arg.Val
if node.Type != nodeInt {
return fmt.Errorf("expecting an integer")
}
sel.Paging.Limit = node.Val
return nil
}
func (com *Compiler) compileArgOffset(sel *Select, arg *Arg) error {
node := arg.Val
if node.Type != nodeInt {
return fmt.Errorf("expecting an integer")
}
sel.Paging.Offset = node.Val
return nil
}
func newExp(st *util.Stack, node *Node, usePool bool) (*Exp, error) {
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name := node.Name
if name[0] == '_' {
name = name[1:]
}
var ex *Exp
if usePool {
ex = expPool.Get().(*Exp)
ex.Reset()
} else {
ex = &Exp{}
}
ex.Children = ex.childrenA[:0]
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switch name {
case "and":
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if len(node.Children) == 0 {
return nil, errors.New("missing expression after 'AND' operator")
}
ex.Op = OpAnd
pushChildren(st, ex, node)
case "or":
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if len(node.Children) == 0 {
return nil, errors.New("missing expression after 'OR' operator")
}
ex.Op = OpOr
pushChildren(st, ex, node)
case "not":
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if len(node.Children) == 0 {
return nil, errors.New("missing expression after 'NOT' operator")
}
ex.Op = OpNot
pushChild(st, ex, node)
case "eq", "equals":
ex.Op = OpEquals
ex.Val = node.Val
case "neq", "not_equals":
ex.Op = OpNotEquals
ex.Val = node.Val
case "gt", "greater_than":
ex.Op = OpGreaterThan
ex.Val = node.Val
case "lt", "lesser_than":
ex.Op = OpLesserThan
ex.Val = node.Val
case "gte", "greater_or_equals":
ex.Op = OpGreaterOrEquals
ex.Val = node.Val
case "lte", "lesser_or_equals":
ex.Op = OpLesserOrEquals
ex.Val = node.Val
case "in":
ex.Op = OpIn
setListVal(ex, node)
case "nin", "not_in":
ex.Op = OpNotIn
setListVal(ex, node)
case "like":
ex.Op = OpLike
ex.Val = node.Val
case "nlike", "not_like":
ex.Op = OpNotLike
ex.Val = node.Val
case "ilike":
ex.Op = OpILike
ex.Val = node.Val
case "nilike", "not_ilike":
ex.Op = OpILike
ex.Val = node.Val
case "similar":
ex.Op = OpSimilar
ex.Val = node.Val
case "nsimilar", "not_similar":
ex.Op = OpNotSimilar
ex.Val = node.Val
case "contains":
ex.Op = OpContains
ex.Val = node.Val
case "contained_in":
ex.Op = OpContainedIn
ex.Val = node.Val
case "has_key":
ex.Op = OpHasKey
ex.Val = node.Val
case "has_key_any":
ex.Op = OpHasKeyAny
ex.Val = node.Val
case "has_key_all":
ex.Op = OpHasKeyAll
ex.Val = node.Val
case "is_null":
ex.Op = OpIsNull
ex.Val = node.Val
default:
pushChildren(st, node.exp, node)
return nil, nil // skip node
}
if ex.Op != OpAnd && ex.Op != OpOr && ex.Op != OpNot {
switch node.Type {
case nodeStr:
ex.Type = ValStr
case nodeInt:
ex.Type = ValInt
case nodeBool:
ex.Type = ValBool
case nodeFloat:
ex.Type = ValFloat
case nodeList:
ex.Type = ValList
case nodeVar:
ex.Type = ValVar
default:
return nil, fmt.Errorf("[Where] valid values include string, int, float, boolean and list: %s", node.Type)
}
setWhereColName(ex, node)
}
return ex, nil
}
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func setListVal(ex *Exp, node *Node) {
if len(node.Children) != 0 {
switch node.Children[0].Type {
case nodeStr:
ex.ListType = ValStr
case nodeInt:
ex.ListType = ValInt
case nodeBool:
ex.ListType = ValBool
case nodeFloat:
ex.ListType = ValFloat
}
}
for i := range node.Children {
ex.ListVal = append(ex.ListVal, node.Children[i].Val)
}
}
func setWhereColName(ex *Exp, node *Node) {
var list []string
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for n := node.Parent; n != nil; n = n.Parent {
if n.Type != nodeObj {
continue
}
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if len(n.Name) != 0 {
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k := n.Name
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if k == "and" || k == "or" || k == "not" ||
k == "_and" || k == "_or" || k == "_not" {
continue
}
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list = append([]string{k}, list...)
}
}
if len(list) == 1 {
ex.Col = list[0]
} else if len(list) > 2 {
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ex.Col = buildPath(list)
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ex.NestedCol = true
}
}
func setOrderByColName(ob *OrderBy, node *Node) {
var list []string
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for n := node; n != nil; n = n.Parent {
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if len(n.Name) != 0 {
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list = append([]string{n.Name}, list...)
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}
}
if len(list) != 0 {
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ob.Col = buildPath(list)
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}
}
func pushChildren(st *util.Stack, exp *Exp, node *Node) {
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for i := range node.Children {
node.Children[i].exp = exp
st.Push(node.Children[i])
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}
}
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func pushChild(st *util.Stack, exp *Exp, node *Node) {
node.Children[0].exp = exp
st.Push(node.Children[0])
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}
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func compileFilter(filter []string) (*Exp, error) {
var fl *Exp
com := &Compiler{}
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st := util.NewStack()
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if len(filter) == 0 {
return &Exp{Op: OpNop}, nil
}
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for i := range filter {
node, err := ParseArgValue(filter[i])
if err != nil {
return nil, err
}
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f, err := com.compileArgNode(st, node, false)
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if err != nil {
return nil, err
}
if fl == nil {
fl = f
} else {
fl = &Exp{Op: OpAnd, Children: []*Exp{fl, f}}
}
}
return fl, nil
}
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func buildPath(a []string) string {
switch len(a) {
case 0:
return ""
case 1:
return a[0]
}
n := len(a) - 1
for i := 0; i < len(a); i++ {
n += len(a[i])
}
var b strings.Builder
b.Grow(n)
b.WriteString(a[0])
for _, s := range a[1:] {
b.WriteRune('.')
b.WriteString(s)
}
return b.String()
}
func (t ExpOp) String() string {
var v string
switch t {
case OpNop:
v = "op-nop"
case OpAnd:
v = "op-and"
case OpOr:
v = "op-or"
case OpNot:
v = "op-not"
case OpEquals:
v = "op-equals"
case OpNotEquals:
v = "op-not-equals"
case OpGreaterOrEquals:
v = "op-greater-or-equals"
case OpLesserOrEquals:
v = "op-lesser-or-equals"
case OpGreaterThan:
v = "op-greater-than"
case OpLesserThan:
v = "op-lesser-than"
case OpIn:
v = "op-in"
case OpNotIn:
v = "op-not-in"
case OpLike:
v = "op-like"
case OpNotLike:
v = "op-not-like"
case OpILike:
v = "op-i-like"
case OpNotILike:
v = "op-not-i-like"
case OpSimilar:
v = "op-similar"
case OpNotSimilar:
v = "op-not-similar"
case OpContains:
v = "op-contains"
case OpContainedIn:
v = "op-contained-in"
case OpHasKey:
v = "op-has-key"
case OpHasKeyAny:
v = "op-has-key-any"
case OpHasKeyAll:
v = "op-has-key-all"
case OpIsNull:
v = "op-is-null"
case OpEqID:
v = "op-eq-id"
case OpTsQuery:
v = "op-ts-query"
}
return fmt.Sprintf("<%s>", v)
}
func FreeExp(ex *Exp) {
if ex.doFree {
expPool.Put(ex)
}
}