mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-27 15:30:23 +00:00
07b05616a0
Bumps [k8s.io/kubernetes](https://github.com/kubernetes/kubernetes) from 1.26.2 to 1.27.2. - [Release notes](https://github.com/kubernetes/kubernetes/releases) - [Commits](https://github.com/kubernetes/kubernetes/compare/v1.26.2...v1.27.2) --- updated-dependencies: - dependency-name: k8s.io/kubernetes dependency-type: direct:production update-type: version-update:semver-minor ... Signed-off-by: dependabot[bot] <support@github.com>
1052 lines
30 KiB
Go
1052 lines
30 KiB
Go
// Copyright 2019 Google LLC
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package interpreter
|
|
|
|
import (
|
|
"fmt"
|
|
"math"
|
|
|
|
"github.com/google/cel-go/common/containers"
|
|
"github.com/google/cel-go/common/types"
|
|
"github.com/google/cel-go/common/types/ref"
|
|
"github.com/google/cel-go/common/types/traits"
|
|
|
|
exprpb "google.golang.org/genproto/googleapis/api/expr/v1alpha1"
|
|
)
|
|
|
|
// AttributeFactory provides methods creating Attribute and Qualifier values.
|
|
type AttributeFactory interface {
|
|
// AbsoluteAttribute creates an attribute that refers to a top-level variable name.
|
|
//
|
|
// Checked expressions generate absolute attribute with a single name.
|
|
// Parse-only expressions may have more than one possible absolute identifier when the
|
|
// expression is created within a container, e.g. package or namespace.
|
|
//
|
|
// When there is more than one name supplied to the AbsoluteAttribute call, the names
|
|
// must be in CEL's namespace resolution order. The name arguments provided here are
|
|
// returned in the same order as they were provided by the NamespacedAttribute
|
|
// CandidateVariableNames method.
|
|
AbsoluteAttribute(id int64, names ...string) NamespacedAttribute
|
|
|
|
// ConditionalAttribute creates an attribute with two Attribute branches, where the Attribute
|
|
// that is resolved depends on the boolean evaluation of the input 'expr'.
|
|
ConditionalAttribute(id int64, expr Interpretable, t, f Attribute) Attribute
|
|
|
|
// MaybeAttribute creates an attribute that refers to either a field selection or a namespaced
|
|
// variable name.
|
|
//
|
|
// Only expressions which have not been type-checked may generate oneof attributes.
|
|
MaybeAttribute(id int64, name string) Attribute
|
|
|
|
// RelativeAttribute creates an attribute whose value is a qualification of a dynamic
|
|
// computation rather than a static variable reference.
|
|
RelativeAttribute(id int64, operand Interpretable) Attribute
|
|
|
|
// NewQualifier creates a qualifier on the target object with a given value.
|
|
//
|
|
// The 'val' may be an Attribute or any proto-supported map key type: bool, int, string, uint.
|
|
//
|
|
// The qualifier may consider the object type being qualified, if present. If absent, the
|
|
// qualification should be considered dynamic and the qualification should still work, though
|
|
// it may be sub-optimal.
|
|
NewQualifier(objType *exprpb.Type, qualID int64, val interface{}) (Qualifier, error)
|
|
}
|
|
|
|
// Qualifier marker interface for designating different qualifier values and where they appear
|
|
// within field selections and index call expressions (`_[_]`).
|
|
type Qualifier interface {
|
|
// ID where the qualifier appears within an expression.
|
|
ID() int64
|
|
|
|
// Qualify performs a qualification, e.g. field selection, on the input object and returns
|
|
// the value or error that results.
|
|
Qualify(vars Activation, obj interface{}) (interface{}, error)
|
|
}
|
|
|
|
// ConstantQualifier interface embeds the Qualifier interface and provides an option to inspect the
|
|
// qualifier's constant value.
|
|
//
|
|
// Non-constant qualifiers are of Attribute type.
|
|
type ConstantQualifier interface {
|
|
Qualifier
|
|
|
|
Value() ref.Val
|
|
}
|
|
|
|
// Attribute values are a variable or value with an optional set of qualifiers, such as field, key,
|
|
// or index accesses.
|
|
type Attribute interface {
|
|
Qualifier
|
|
|
|
// AddQualifier adds a qualifier on the Attribute or error if the qualification is not a valid
|
|
// qualifier type.
|
|
AddQualifier(Qualifier) (Attribute, error)
|
|
|
|
// Resolve returns the value of the Attribute given the current Activation.
|
|
Resolve(Activation) (interface{}, error)
|
|
}
|
|
|
|
// NamespacedAttribute values are a variable within a namespace, and an optional set of qualifiers
|
|
// such as field, key, or index accesses.
|
|
type NamespacedAttribute interface {
|
|
Attribute
|
|
|
|
// CandidateVariableNames returns the possible namespaced variable names for this Attribute in
|
|
// the CEL namespace resolution order.
|
|
CandidateVariableNames() []string
|
|
|
|
// Qualifiers returns the list of qualifiers associated with the Attribute.s
|
|
Qualifiers() []Qualifier
|
|
|
|
// TryResolve attempts to return the value of the attribute given the current Activation.
|
|
// If an error is encountered during attribute resolution, it will be returned immediately.
|
|
// If the attribute cannot be resolved within the Activation, the result must be: `nil`,
|
|
// `false`, `nil`.
|
|
TryResolve(Activation) (interface{}, bool, error)
|
|
}
|
|
|
|
// NewAttributeFactory returns a default AttributeFactory which is produces Attribute values
|
|
// capable of resolving types by simple names and qualify the values using the supported qualifier
|
|
// types: bool, int, string, and uint.
|
|
func NewAttributeFactory(cont *containers.Container,
|
|
a ref.TypeAdapter,
|
|
p ref.TypeProvider) AttributeFactory {
|
|
return &attrFactory{
|
|
container: cont,
|
|
adapter: a,
|
|
provider: p,
|
|
}
|
|
}
|
|
|
|
type attrFactory struct {
|
|
container *containers.Container
|
|
adapter ref.TypeAdapter
|
|
provider ref.TypeProvider
|
|
}
|
|
|
|
// AbsoluteAttribute refers to a variable value and an optional qualifier path.
|
|
//
|
|
// The namespaceNames represent the names the variable could have based on namespace
|
|
// resolution rules.
|
|
func (r *attrFactory) AbsoluteAttribute(id int64, names ...string) NamespacedAttribute {
|
|
return &absoluteAttribute{
|
|
id: id,
|
|
namespaceNames: names,
|
|
qualifiers: []Qualifier{},
|
|
adapter: r.adapter,
|
|
provider: r.provider,
|
|
fac: r,
|
|
}
|
|
}
|
|
|
|
// ConditionalAttribute supports the case where an attribute selection may occur on a conditional
|
|
// expression, e.g. (cond ? a : b).c
|
|
func (r *attrFactory) ConditionalAttribute(id int64, expr Interpretable, t, f Attribute) Attribute {
|
|
return &conditionalAttribute{
|
|
id: id,
|
|
expr: expr,
|
|
truthy: t,
|
|
falsy: f,
|
|
adapter: r.adapter,
|
|
fac: r,
|
|
}
|
|
}
|
|
|
|
// MaybeAttribute collects variants of unchecked AbsoluteAttribute values which could either be
|
|
// direct variable accesses or some combination of variable access with qualification.
|
|
func (r *attrFactory) MaybeAttribute(id int64, name string) Attribute {
|
|
return &maybeAttribute{
|
|
id: id,
|
|
attrs: []NamespacedAttribute{
|
|
r.AbsoluteAttribute(id, r.container.ResolveCandidateNames(name)...),
|
|
},
|
|
adapter: r.adapter,
|
|
provider: r.provider,
|
|
fac: r,
|
|
}
|
|
}
|
|
|
|
// RelativeAttribute refers to an expression and an optional qualifier path.
|
|
func (r *attrFactory) RelativeAttribute(id int64, operand Interpretable) Attribute {
|
|
return &relativeAttribute{
|
|
id: id,
|
|
operand: operand,
|
|
qualifiers: []Qualifier{},
|
|
adapter: r.adapter,
|
|
fac: r,
|
|
}
|
|
}
|
|
|
|
// NewQualifier is an implementation of the AttributeFactory interface.
|
|
func (r *attrFactory) NewQualifier(objType *exprpb.Type,
|
|
qualID int64,
|
|
val interface{}) (Qualifier, error) {
|
|
// Before creating a new qualifier check to see if this is a protobuf message field access.
|
|
// If so, use the precomputed GetFrom qualification method rather than the standard
|
|
// stringQualifier.
|
|
str, isStr := val.(string)
|
|
if isStr && objType != nil && objType.GetMessageType() != "" {
|
|
ft, found := r.provider.FindFieldType(objType.GetMessageType(), str)
|
|
if found && ft.IsSet != nil && ft.GetFrom != nil {
|
|
return &fieldQualifier{
|
|
id: qualID,
|
|
Name: str,
|
|
FieldType: ft,
|
|
adapter: r.adapter,
|
|
}, nil
|
|
}
|
|
}
|
|
return newQualifier(r.adapter, qualID, val)
|
|
}
|
|
|
|
type absoluteAttribute struct {
|
|
id int64
|
|
// namespaceNames represent the names the variable could have based on declared container
|
|
// (package) of the expression.
|
|
namespaceNames []string
|
|
qualifiers []Qualifier
|
|
adapter ref.TypeAdapter
|
|
provider ref.TypeProvider
|
|
fac AttributeFactory
|
|
}
|
|
|
|
// ID implements the Attribute interface method.
|
|
func (a *absoluteAttribute) ID() int64 {
|
|
return a.id
|
|
}
|
|
|
|
// Cost implements the Coster interface method.
|
|
func (a *absoluteAttribute) Cost() (min, max int64) {
|
|
for _, q := range a.qualifiers {
|
|
minQ, maxQ := estimateCost(q)
|
|
min += minQ
|
|
max += maxQ
|
|
}
|
|
min++ // For object retrieval.
|
|
max++
|
|
return
|
|
}
|
|
|
|
// AddQualifier implements the Attribute interface method.
|
|
func (a *absoluteAttribute) AddQualifier(qual Qualifier) (Attribute, error) {
|
|
a.qualifiers = append(a.qualifiers, qual)
|
|
return a, nil
|
|
}
|
|
|
|
// CandidateVariableNames implements the NamespaceAttribute interface method.
|
|
func (a *absoluteAttribute) CandidateVariableNames() []string {
|
|
return a.namespaceNames
|
|
}
|
|
|
|
// Qualifiers returns the list of Qualifier instances associated with the namespaced attribute.
|
|
func (a *absoluteAttribute) Qualifiers() []Qualifier {
|
|
return a.qualifiers
|
|
}
|
|
|
|
// Qualify is an implementation of the Qualifier interface method.
|
|
func (a *absoluteAttribute) Qualify(vars Activation, obj interface{}) (interface{}, error) {
|
|
val, err := a.Resolve(vars)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
unk, isUnk := val.(types.Unknown)
|
|
if isUnk {
|
|
return unk, nil
|
|
}
|
|
qual, err := a.fac.NewQualifier(nil, a.id, val)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return qual.Qualify(vars, obj)
|
|
}
|
|
|
|
// Resolve returns the resolved Attribute value given the Activation, or error if the Attribute
|
|
// variable is not found, or if its Qualifiers cannot be applied successfully.
|
|
func (a *absoluteAttribute) Resolve(vars Activation) (interface{}, error) {
|
|
obj, found, err := a.TryResolve(vars)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
if found {
|
|
return obj, nil
|
|
}
|
|
return nil, fmt.Errorf("no such attribute: %v", a)
|
|
}
|
|
|
|
// String implements the Stringer interface method.
|
|
func (a *absoluteAttribute) String() string {
|
|
return fmt.Sprintf("id: %v, names: %v", a.id, a.namespaceNames)
|
|
}
|
|
|
|
// TryResolve iterates through the namespaced variable names until one is found within the
|
|
// Activation or TypeProvider.
|
|
//
|
|
// If the variable name cannot be found as an Activation variable or in the TypeProvider as
|
|
// a type, then the result is `nil`, `false`, `nil` per the interface requirement.
|
|
func (a *absoluteAttribute) TryResolve(vars Activation) (interface{}, bool, error) {
|
|
for _, nm := range a.namespaceNames {
|
|
// If the variable is found, process it. Otherwise, wait until the checks to
|
|
// determine whether the type is unknown before returning.
|
|
op, found := vars.ResolveName(nm)
|
|
if found {
|
|
var err error
|
|
for _, qual := range a.qualifiers {
|
|
op, err = qual.Qualify(vars, op)
|
|
if err != nil {
|
|
return nil, true, err
|
|
}
|
|
}
|
|
return op, true, nil
|
|
}
|
|
// Attempt to resolve the qualified type name if the name is not a variable identifier.
|
|
typ, found := a.provider.FindIdent(nm)
|
|
if found {
|
|
if len(a.qualifiers) == 0 {
|
|
return typ, true, nil
|
|
}
|
|
return nil, true, fmt.Errorf("no such attribute: %v", typ)
|
|
}
|
|
}
|
|
return nil, false, nil
|
|
}
|
|
|
|
type conditionalAttribute struct {
|
|
id int64
|
|
expr Interpretable
|
|
truthy Attribute
|
|
falsy Attribute
|
|
adapter ref.TypeAdapter
|
|
fac AttributeFactory
|
|
}
|
|
|
|
// ID is an implementation of the Attribute interface method.
|
|
func (a *conditionalAttribute) ID() int64 {
|
|
return a.id
|
|
}
|
|
|
|
// Cost provides the heuristic cost of a ternary operation <expr> ? <t> : <f>.
|
|
// The cost is computed as cost(expr) plus the min/max costs of evaluating either
|
|
// `t` or `f`.
|
|
func (a *conditionalAttribute) Cost() (min, max int64) {
|
|
tMin, tMax := estimateCost(a.truthy)
|
|
fMin, fMax := estimateCost(a.falsy)
|
|
eMin, eMax := estimateCost(a.expr)
|
|
return eMin + findMin(tMin, fMin), eMax + findMax(tMax, fMax)
|
|
}
|
|
|
|
// AddQualifier appends the same qualifier to both sides of the conditional, in effect managing
|
|
// the qualification of alternate attributes.
|
|
func (a *conditionalAttribute) AddQualifier(qual Qualifier) (Attribute, error) {
|
|
_, err := a.truthy.AddQualifier(qual)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
_, err = a.falsy.AddQualifier(qual)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return a, nil
|
|
}
|
|
|
|
// Qualify is an implementation of the Qualifier interface method.
|
|
func (a *conditionalAttribute) Qualify(vars Activation, obj interface{}) (interface{}, error) {
|
|
val, err := a.Resolve(vars)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
unk, isUnk := val.(types.Unknown)
|
|
if isUnk {
|
|
return unk, nil
|
|
}
|
|
qual, err := a.fac.NewQualifier(nil, a.id, val)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return qual.Qualify(vars, obj)
|
|
}
|
|
|
|
// Resolve evaluates the condition, and then resolves the truthy or falsy branch accordingly.
|
|
func (a *conditionalAttribute) Resolve(vars Activation) (interface{}, error) {
|
|
val := a.expr.Eval(vars)
|
|
if types.IsError(val) {
|
|
return nil, val.(*types.Err)
|
|
}
|
|
if val == types.True {
|
|
return a.truthy.Resolve(vars)
|
|
}
|
|
if val == types.False {
|
|
return a.falsy.Resolve(vars)
|
|
}
|
|
if types.IsUnknown(val) {
|
|
return val, nil
|
|
}
|
|
return nil, types.MaybeNoSuchOverloadErr(val).(*types.Err)
|
|
}
|
|
|
|
// String is an implementation of the Stringer interface method.
|
|
func (a *conditionalAttribute) String() string {
|
|
return fmt.Sprintf("id: %v, truthy attribute: %v, falsy attribute: %v", a.id, a.truthy, a.falsy)
|
|
}
|
|
|
|
type maybeAttribute struct {
|
|
id int64
|
|
attrs []NamespacedAttribute
|
|
adapter ref.TypeAdapter
|
|
provider ref.TypeProvider
|
|
fac AttributeFactory
|
|
}
|
|
|
|
// ID is an implementation of the Attribute interface method.
|
|
func (a *maybeAttribute) ID() int64 {
|
|
return a.id
|
|
}
|
|
|
|
// Cost implements the Coster interface method. The min cost is computed as the minimal cost among
|
|
// all the possible attributes, the max cost ditto.
|
|
func (a *maybeAttribute) Cost() (min, max int64) {
|
|
min, max = math.MaxInt64, 0
|
|
for _, a := range a.attrs {
|
|
minA, maxA := estimateCost(a)
|
|
min = findMin(min, minA)
|
|
max = findMax(max, maxA)
|
|
}
|
|
return
|
|
}
|
|
|
|
func findMin(x, y int64) int64 {
|
|
if x < y {
|
|
return x
|
|
}
|
|
return y
|
|
}
|
|
|
|
func findMax(x, y int64) int64 {
|
|
if x > y {
|
|
return x
|
|
}
|
|
return y
|
|
}
|
|
|
|
// AddQualifier adds a qualifier to each possible attribute variant, and also creates
|
|
// a new namespaced variable from the qualified value.
|
|
//
|
|
// The algorithm for building the maybe attribute is as follows:
|
|
//
|
|
// 1. Create a maybe attribute from a simple identifier when it occurs in a parsed-only expression
|
|
//
|
|
// mb = MaybeAttribute(<id>, "a")
|
|
//
|
|
// Initializing the maybe attribute creates an absolute attribute internally which includes the
|
|
// possible namespaced names of the attribute. In this example, let's assume we are in namespace
|
|
// 'ns', then the maybe is either one of the following variable names:
|
|
//
|
|
// possible variables names -- ns.a, a
|
|
//
|
|
// 2. Adding a qualifier to the maybe means that the variable name could be a longer qualified
|
|
// name, or a field selection on one of the possible variable names produced earlier:
|
|
//
|
|
// mb.AddQualifier("b")
|
|
//
|
|
// possible variables names -- ns.a.b, a.b
|
|
// possible field selection -- ns.a['b'], a['b']
|
|
//
|
|
// If none of the attributes within the maybe resolves a value, the result is an error.
|
|
func (a *maybeAttribute) AddQualifier(qual Qualifier) (Attribute, error) {
|
|
str := ""
|
|
isStr := false
|
|
cq, isConst := qual.(ConstantQualifier)
|
|
if isConst {
|
|
str, isStr = cq.Value().Value().(string)
|
|
}
|
|
var augmentedNames []string
|
|
// First add the qualifier to all existing attributes in the oneof.
|
|
for _, attr := range a.attrs {
|
|
if isStr && len(attr.Qualifiers()) == 0 {
|
|
candidateVars := attr.CandidateVariableNames()
|
|
augmentedNames = make([]string, len(candidateVars))
|
|
for i, name := range candidateVars {
|
|
augmentedNames[i] = fmt.Sprintf("%s.%s", name, str)
|
|
}
|
|
}
|
|
_, err := attr.AddQualifier(qual)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
// Next, ensure the most specific variable / type reference is searched first.
|
|
a.attrs = append([]NamespacedAttribute{a.fac.AbsoluteAttribute(qual.ID(), augmentedNames...)}, a.attrs...)
|
|
return a, nil
|
|
}
|
|
|
|
// Qualify is an implementation of the Qualifier interface method.
|
|
func (a *maybeAttribute) Qualify(vars Activation, obj interface{}) (interface{}, error) {
|
|
val, err := a.Resolve(vars)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
unk, isUnk := val.(types.Unknown)
|
|
if isUnk {
|
|
return unk, nil
|
|
}
|
|
qual, err := a.fac.NewQualifier(nil, a.id, val)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return qual.Qualify(vars, obj)
|
|
}
|
|
|
|
// Resolve follows the variable resolution rules to determine whether the attribute is a variable
|
|
// or a field selection.
|
|
func (a *maybeAttribute) Resolve(vars Activation) (interface{}, error) {
|
|
for _, attr := range a.attrs {
|
|
obj, found, err := attr.TryResolve(vars)
|
|
// Return an error if one is encountered.
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
// If the object was found, return it.
|
|
if found {
|
|
return obj, nil
|
|
}
|
|
}
|
|
// Else, produce a no such attribute error.
|
|
return nil, fmt.Errorf("no such attribute: %v", a)
|
|
}
|
|
|
|
// String is an implementation of the Stringer interface method.
|
|
func (a *maybeAttribute) String() string {
|
|
return fmt.Sprintf("id: %v, attributes: %v", a.id, a.attrs)
|
|
}
|
|
|
|
type relativeAttribute struct {
|
|
id int64
|
|
operand Interpretable
|
|
qualifiers []Qualifier
|
|
adapter ref.TypeAdapter
|
|
fac AttributeFactory
|
|
}
|
|
|
|
// ID is an implementation of the Attribute interface method.
|
|
func (a *relativeAttribute) ID() int64 {
|
|
return a.id
|
|
}
|
|
|
|
// Cost implements the Coster interface method.
|
|
func (a *relativeAttribute) Cost() (min, max int64) {
|
|
min, max = estimateCost(a.operand)
|
|
for _, qual := range a.qualifiers {
|
|
minQ, maxQ := estimateCost(qual)
|
|
min += minQ
|
|
max += maxQ
|
|
}
|
|
return
|
|
}
|
|
|
|
// AddQualifier implements the Attribute interface method.
|
|
func (a *relativeAttribute) AddQualifier(qual Qualifier) (Attribute, error) {
|
|
a.qualifiers = append(a.qualifiers, qual)
|
|
return a, nil
|
|
}
|
|
|
|
// Qualify is an implementation of the Qualifier interface method.
|
|
func (a *relativeAttribute) Qualify(vars Activation, obj interface{}) (interface{}, error) {
|
|
val, err := a.Resolve(vars)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
unk, isUnk := val.(types.Unknown)
|
|
if isUnk {
|
|
return unk, nil
|
|
}
|
|
qual, err := a.fac.NewQualifier(nil, a.id, val)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return qual.Qualify(vars, obj)
|
|
}
|
|
|
|
// Resolve expression value and qualifier relative to the expression result.
|
|
func (a *relativeAttribute) Resolve(vars Activation) (interface{}, error) {
|
|
// First, evaluate the operand.
|
|
v := a.operand.Eval(vars)
|
|
if types.IsError(v) {
|
|
return nil, v.(*types.Err)
|
|
}
|
|
if types.IsUnknown(v) {
|
|
return v, nil
|
|
}
|
|
// Next, qualify it. Qualification handles unknowns as well, so there's no need to recheck.
|
|
var err error
|
|
var obj interface{} = v
|
|
for _, qual := range a.qualifiers {
|
|
obj, err = qual.Qualify(vars, obj)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
return obj, nil
|
|
}
|
|
|
|
// String is an implementation of the Stringer interface method.
|
|
func (a *relativeAttribute) String() string {
|
|
return fmt.Sprintf("id: %v, operand: %v", a.id, a.operand)
|
|
}
|
|
|
|
func newQualifier(adapter ref.TypeAdapter, id int64, v interface{}) (Qualifier, error) {
|
|
var qual Qualifier
|
|
switch val := v.(type) {
|
|
case Attribute:
|
|
return &attrQualifier{id: id, Attribute: val}, nil
|
|
case string:
|
|
qual = &stringQualifier{id: id, value: val, celValue: types.String(val), adapter: adapter}
|
|
case int:
|
|
qual = &intQualifier{id: id, value: int64(val), celValue: types.Int(val), adapter: adapter}
|
|
case int32:
|
|
qual = &intQualifier{id: id, value: int64(val), celValue: types.Int(val), adapter: adapter}
|
|
case int64:
|
|
qual = &intQualifier{id: id, value: val, celValue: types.Int(val), adapter: adapter}
|
|
case uint:
|
|
qual = &uintQualifier{id: id, value: uint64(val), celValue: types.Uint(val), adapter: adapter}
|
|
case uint32:
|
|
qual = &uintQualifier{id: id, value: uint64(val), celValue: types.Uint(val), adapter: adapter}
|
|
case uint64:
|
|
qual = &uintQualifier{id: id, value: val, celValue: types.Uint(val), adapter: adapter}
|
|
case bool:
|
|
qual = &boolQualifier{id: id, value: val, celValue: types.Bool(val), adapter: adapter}
|
|
case float32:
|
|
qual = &doubleQualifier{id: id, value: float64(val), celValue: types.Double(val), adapter: adapter}
|
|
case float64:
|
|
qual = &doubleQualifier{id: id, value: val, celValue: types.Double(val), adapter: adapter}
|
|
case types.String:
|
|
qual = &stringQualifier{id: id, value: string(val), celValue: val, adapter: adapter}
|
|
case types.Int:
|
|
qual = &intQualifier{id: id, value: int64(val), celValue: val, adapter: adapter}
|
|
case types.Uint:
|
|
qual = &uintQualifier{id: id, value: uint64(val), celValue: val, adapter: adapter}
|
|
case types.Bool:
|
|
qual = &boolQualifier{id: id, value: bool(val), celValue: val, adapter: adapter}
|
|
case types.Double:
|
|
qual = &doubleQualifier{id: id, value: float64(val), celValue: val, adapter: adapter}
|
|
default:
|
|
return nil, fmt.Errorf("invalid qualifier type: %T", v)
|
|
}
|
|
return qual, nil
|
|
}
|
|
|
|
type attrQualifier struct {
|
|
id int64
|
|
Attribute
|
|
}
|
|
|
|
func (q *attrQualifier) ID() int64 {
|
|
return q.id
|
|
}
|
|
|
|
// Cost returns zero for constant field qualifiers
|
|
func (q *attrQualifier) Cost() (min, max int64) {
|
|
return estimateCost(q.Attribute)
|
|
}
|
|
|
|
type stringQualifier struct {
|
|
id int64
|
|
value string
|
|
celValue ref.Val
|
|
adapter ref.TypeAdapter
|
|
}
|
|
|
|
// ID is an implementation of the Qualifier interface method.
|
|
func (q *stringQualifier) ID() int64 {
|
|
return q.id
|
|
}
|
|
|
|
// Qualify implements the Qualifier interface method.
|
|
func (q *stringQualifier) Qualify(vars Activation, obj interface{}) (interface{}, error) {
|
|
s := q.value
|
|
isMap := false
|
|
isKey := false
|
|
switch o := obj.(type) {
|
|
case map[string]interface{}:
|
|
isMap = true
|
|
obj, isKey = o[s]
|
|
case map[string]string:
|
|
isMap = true
|
|
obj, isKey = o[s]
|
|
case map[string]int:
|
|
isMap = true
|
|
obj, isKey = o[s]
|
|
case map[string]int32:
|
|
isMap = true
|
|
obj, isKey = o[s]
|
|
case map[string]int64:
|
|
isMap = true
|
|
obj, isKey = o[s]
|
|
case map[string]uint:
|
|
isMap = true
|
|
obj, isKey = o[s]
|
|
case map[string]uint32:
|
|
isMap = true
|
|
obj, isKey = o[s]
|
|
case map[string]uint64:
|
|
isMap = true
|
|
obj, isKey = o[s]
|
|
case map[string]float32:
|
|
isMap = true
|
|
obj, isKey = o[s]
|
|
case map[string]float64:
|
|
isMap = true
|
|
obj, isKey = o[s]
|
|
case map[string]bool:
|
|
isMap = true
|
|
obj, isKey = o[s]
|
|
case types.Unknown:
|
|
return o, nil
|
|
default:
|
|
elem, err := refResolve(q.adapter, q.celValue, obj)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return elem, nil
|
|
}
|
|
if isMap && !isKey {
|
|
return nil, fmt.Errorf("no such key: %v", s)
|
|
}
|
|
return obj, nil
|
|
}
|
|
|
|
// Value implements the ConstantQualifier interface
|
|
func (q *stringQualifier) Value() ref.Val {
|
|
return q.celValue
|
|
}
|
|
|
|
// Cost returns zero for constant field qualifiers
|
|
func (q *stringQualifier) Cost() (min, max int64) {
|
|
return 0, 0
|
|
}
|
|
|
|
type intQualifier struct {
|
|
id int64
|
|
value int64
|
|
celValue ref.Val
|
|
adapter ref.TypeAdapter
|
|
}
|
|
|
|
// ID is an implementation of the Qualifier interface method.
|
|
func (q *intQualifier) ID() int64 {
|
|
return q.id
|
|
}
|
|
|
|
// Qualify implements the Qualifier interface method.
|
|
func (q *intQualifier) Qualify(vars Activation, obj interface{}) (interface{}, error) {
|
|
i := q.value
|
|
isMap := false
|
|
isKey := false
|
|
isIndex := false
|
|
switch o := obj.(type) {
|
|
// The specialized map types supported by an int qualifier are considerably fewer than the set
|
|
// of specialized map types supported by string qualifiers since they are less frequently used
|
|
// than string-based map keys. Additional specializations may be added in the future if
|
|
// desired.
|
|
case map[int]interface{}:
|
|
isMap = true
|
|
obj, isKey = o[int(i)]
|
|
case map[int32]interface{}:
|
|
isMap = true
|
|
obj, isKey = o[int32(i)]
|
|
case map[int64]interface{}:
|
|
isMap = true
|
|
obj, isKey = o[i]
|
|
case []interface{}:
|
|
isIndex = i >= 0 && i < int64(len(o))
|
|
if isIndex {
|
|
obj = o[i]
|
|
}
|
|
case []string:
|
|
isIndex = i >= 0 && i < int64(len(o))
|
|
if isIndex {
|
|
obj = o[i]
|
|
}
|
|
case []int:
|
|
isIndex = i >= 0 && i < int64(len(o))
|
|
if isIndex {
|
|
obj = o[i]
|
|
}
|
|
case []int32:
|
|
isIndex = i >= 0 && i < int64(len(o))
|
|
if isIndex {
|
|
obj = o[i]
|
|
}
|
|
case []int64:
|
|
isIndex = i >= 0 && i < int64(len(o))
|
|
if isIndex {
|
|
obj = o[i]
|
|
}
|
|
case []uint:
|
|
isIndex = i >= 0 && i < int64(len(o))
|
|
if isIndex {
|
|
obj = o[i]
|
|
}
|
|
case []uint32:
|
|
isIndex = i >= 0 && i < int64(len(o))
|
|
if isIndex {
|
|
obj = o[i]
|
|
}
|
|
case []uint64:
|
|
isIndex = i >= 0 && i < int64(len(o))
|
|
if isIndex {
|
|
obj = o[i]
|
|
}
|
|
case []float32:
|
|
isIndex = i >= 0 && i < int64(len(o))
|
|
if isIndex {
|
|
obj = o[i]
|
|
}
|
|
case []float64:
|
|
isIndex = i >= 0 && i < int64(len(o))
|
|
if isIndex {
|
|
obj = o[i]
|
|
}
|
|
case []bool:
|
|
isIndex = i >= 0 && i < int64(len(o))
|
|
if isIndex {
|
|
obj = o[i]
|
|
}
|
|
case types.Unknown:
|
|
return o, nil
|
|
default:
|
|
elem, err := refResolve(q.adapter, q.celValue, obj)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return elem, nil
|
|
}
|
|
if isMap && !isKey {
|
|
return nil, fmt.Errorf("no such key: %v", i)
|
|
}
|
|
if !isMap && !isIndex {
|
|
return nil, fmt.Errorf("index out of bounds: %v", i)
|
|
}
|
|
return obj, nil
|
|
}
|
|
|
|
// Value implements the ConstantQualifier interface
|
|
func (q *intQualifier) Value() ref.Val {
|
|
return q.celValue
|
|
}
|
|
|
|
// Cost returns zero for constant field qualifiers
|
|
func (q *intQualifier) Cost() (min, max int64) {
|
|
return 0, 0
|
|
}
|
|
|
|
type uintQualifier struct {
|
|
id int64
|
|
value uint64
|
|
celValue ref.Val
|
|
adapter ref.TypeAdapter
|
|
}
|
|
|
|
// ID is an implementation of the Qualifier interface method.
|
|
func (q *uintQualifier) ID() int64 {
|
|
return q.id
|
|
}
|
|
|
|
// Qualify implements the Qualifier interface method.
|
|
func (q *uintQualifier) Qualify(vars Activation, obj interface{}) (interface{}, error) {
|
|
u := q.value
|
|
isMap := false
|
|
isKey := false
|
|
switch o := obj.(type) {
|
|
// The specialized map types supported by a uint qualifier are considerably fewer than the set
|
|
// of specialized map types supported by string qualifiers since they are less frequently used
|
|
// than string-based map keys. Additional specializations may be added in the future if
|
|
// desired.
|
|
case map[uint]interface{}:
|
|
isMap = true
|
|
obj, isKey = o[uint(u)]
|
|
case map[uint32]interface{}:
|
|
isMap = true
|
|
obj, isKey = o[uint32(u)]
|
|
case map[uint64]interface{}:
|
|
isMap = true
|
|
obj, isKey = o[u]
|
|
case types.Unknown:
|
|
return o, nil
|
|
default:
|
|
elem, err := refResolve(q.adapter, q.celValue, obj)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return elem, nil
|
|
}
|
|
if isMap && !isKey {
|
|
return nil, fmt.Errorf("no such key: %v", u)
|
|
}
|
|
return obj, nil
|
|
}
|
|
|
|
// Value implements the ConstantQualifier interface
|
|
func (q *uintQualifier) Value() ref.Val {
|
|
return q.celValue
|
|
}
|
|
|
|
// Cost returns zero for constant field qualifiers
|
|
func (q *uintQualifier) Cost() (min, max int64) {
|
|
return 0, 0
|
|
}
|
|
|
|
type boolQualifier struct {
|
|
id int64
|
|
value bool
|
|
celValue ref.Val
|
|
adapter ref.TypeAdapter
|
|
}
|
|
|
|
// ID is an implementation of the Qualifier interface method.
|
|
func (q *boolQualifier) ID() int64 {
|
|
return q.id
|
|
}
|
|
|
|
// Qualify implements the Qualifier interface method.
|
|
func (q *boolQualifier) Qualify(vars Activation, obj interface{}) (interface{}, error) {
|
|
b := q.value
|
|
isKey := false
|
|
switch o := obj.(type) {
|
|
// The specialized map types supported by a bool qualifier are considerably fewer than the set
|
|
// of specialized map types supported by string qualifiers since they are less frequently used
|
|
// than string-based map keys. Additional specializations may be added in the future if
|
|
// desired.
|
|
case map[bool]interface{}:
|
|
obj, isKey = o[b]
|
|
case types.Unknown:
|
|
return o, nil
|
|
default:
|
|
elem, err := refResolve(q.adapter, q.celValue, obj)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return elem, nil
|
|
}
|
|
if !isKey {
|
|
return nil, fmt.Errorf("no such key: %v", b)
|
|
}
|
|
return obj, nil
|
|
}
|
|
|
|
// Value implements the ConstantQualifier interface
|
|
func (q *boolQualifier) Value() ref.Val {
|
|
return q.celValue
|
|
}
|
|
|
|
// Cost returns zero for constant field qualifiers
|
|
func (q *boolQualifier) Cost() (min, max int64) {
|
|
return 0, 0
|
|
}
|
|
|
|
// fieldQualifier indicates that the qualification is a well-defined field with a known
|
|
// field type. When the field type is known this can be used to improve the speed and
|
|
// efficiency of field resolution.
|
|
type fieldQualifier struct {
|
|
id int64
|
|
Name string
|
|
FieldType *ref.FieldType
|
|
adapter ref.TypeAdapter
|
|
}
|
|
|
|
// ID is an implementation of the Qualifier interface method.
|
|
func (q *fieldQualifier) ID() int64 {
|
|
return q.id
|
|
}
|
|
|
|
// Qualify implements the Qualifier interface method.
|
|
func (q *fieldQualifier) Qualify(vars Activation, obj interface{}) (interface{}, error) {
|
|
if rv, ok := obj.(ref.Val); ok {
|
|
obj = rv.Value()
|
|
}
|
|
return q.FieldType.GetFrom(obj)
|
|
}
|
|
|
|
// Value implements the ConstantQualifier interface
|
|
func (q *fieldQualifier) Value() ref.Val {
|
|
return types.String(q.Name)
|
|
}
|
|
|
|
// Cost returns zero for constant field qualifiers
|
|
func (q *fieldQualifier) Cost() (min, max int64) {
|
|
return 0, 0
|
|
}
|
|
|
|
// doubleQualifier qualifies a CEL object, map, or list using a double value.
|
|
//
|
|
// This qualifier is used for working with dynamic data like JSON or protobuf.Any where the value
|
|
// type may not be known ahead of time and may not conform to the standard types supported as valid
|
|
// protobuf map key types.
|
|
type doubleQualifier struct {
|
|
id int64
|
|
value float64
|
|
celValue ref.Val
|
|
adapter ref.TypeAdapter
|
|
}
|
|
|
|
// ID is an implementation of the Qualifier interface method.
|
|
func (q *doubleQualifier) ID() int64 {
|
|
return q.id
|
|
}
|
|
|
|
// Qualify implements the Qualifier interface method.
|
|
func (q *doubleQualifier) Qualify(vars Activation, obj interface{}) (interface{}, error) {
|
|
switch o := obj.(type) {
|
|
case types.Unknown:
|
|
return o, nil
|
|
default:
|
|
elem, err := refResolve(q.adapter, q.celValue, obj)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return elem, nil
|
|
}
|
|
}
|
|
|
|
// refResolve attempts to convert the value to a CEL value and then uses reflection methods
|
|
// to try and resolve the qualifier.
|
|
func refResolve(adapter ref.TypeAdapter, idx ref.Val, obj interface{}) (ref.Val, error) {
|
|
celVal := adapter.NativeToValue(obj)
|
|
mapper, isMapper := celVal.(traits.Mapper)
|
|
if isMapper {
|
|
elem, found := mapper.Find(idx)
|
|
if !found {
|
|
return nil, fmt.Errorf("no such key: %v", idx)
|
|
}
|
|
return elem, nil
|
|
}
|
|
indexer, isIndexer := celVal.(traits.Indexer)
|
|
if isIndexer {
|
|
elem := indexer.Get(idx)
|
|
if types.IsError(elem) {
|
|
return nil, elem.(*types.Err)
|
|
}
|
|
return elem, nil
|
|
}
|
|
if types.IsUnknown(celVal) {
|
|
return celVal, nil
|
|
}
|
|
// TODO: If the types.Err value contains more than just an error message at some point in the
|
|
// future, then it would be reasonable to return error values as ref.Val types rather than
|
|
// simple go error types.
|
|
if types.IsError(celVal) {
|
|
return nil, celVal.(*types.Err)
|
|
}
|
|
return nil, fmt.Errorf("no such key: %v", idx)
|
|
}
|