eval

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 Go to latest Published: Jun 11, 2021 License: Apache-2.0 Imports: 12 Imported by: 0

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Constants

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const (
	FunctionWeight       = 5
	InArrayWeight        = 10
	HandlerWeight        = 50
	RegexpWeight         = 100
	InPatternArrayWeight = 1000
	IteratorWeight       = 2000
)

defines factor applied by specific operator

Variables

This section is empty.

Functions

func NewCookie 

func NewCookie() uint32

NewCookie returns a new random cookie

func NotOfValue 

func NotOfValue(value interface{}) (interface{}, error)

NotOfValue returns the NOT of a value

func RandString 

func RandString(n int) string

RandString returns a random string of the given length size

Types

type BoolArrayEvaluator 

type BoolArrayEvaluator struct {
	EvalFnc func(ctx *Context) []bool
	Field   Field
	Values  []bool
	Weight  int
	// contains filtered or unexported fields
}

BoolArrayEvaluator returns an array of bool

func (*BoolArrayEvaluator) Eval 

func (b *BoolArrayEvaluator) Eval(ctx *Context) interface{}

Eval returns the result of the evaluation

func (*BoolArrayEvaluator) GetField 

func (b *BoolArrayEvaluator) GetField() string

GetField returns field name used by this evaluator

func (*BoolArrayEvaluator) IsPartial 

func (b *BoolArrayEvaluator) IsPartial() bool

IsPartial returns whether the evaluator is partial

func (*BoolArrayEvaluator) IsScalar 

func (b *BoolArrayEvaluator) IsScalar() bool

IsScalar returns whether the evaluator is a scalar

type BoolEvalFnc 

type BoolEvalFnc = func(ctx *Context) bool

BoolEvalFnc describe a eval function return a boolean

type BoolEvaluator 

type BoolEvaluator struct {
	EvalFnc BoolEvalFnc
	Field   Field
	Value   bool
	Weight  int
	// contains filtered or unexported fields
}

BoolEvaluator returns a bool as result of the evaluation

func And 

func And(a *BoolEvaluator, b *BoolEvaluator, opts *Opts, state *state) (*BoolEvaluator, error)

func ArrayBoolContains 

func ArrayBoolContains(a *BoolEvaluator, b *BoolArrayEvaluator, opts *Opts, state *state) (*BoolEvaluator, error)

ArrayBoolContains evaluates array of bool against a value

func ArrayBoolEquals 

func ArrayBoolEquals(a *BoolEvaluator, b *BoolArrayEvaluator, opts *Opts, state *state) (*BoolEvaluator, error)

func ArrayIntEquals 

func ArrayIntEquals(a *IntEvaluator, b *IntArrayEvaluator, opts *Opts, state *state) (*BoolEvaluator, error)

func ArrayIntGreaterOrEqualThan 

func ArrayIntGreaterOrEqualThan(a *IntEvaluator, b *IntArrayEvaluator, opts *Opts, state *state) (*BoolEvaluator, error)

func ArrayIntGreaterThan 

func ArrayIntGreaterThan(a *IntEvaluator, b *IntArrayEvaluator, opts *Opts, state *state) (*BoolEvaluator, error)

func ArrayIntLesserOrEqualThan 

func ArrayIntLesserOrEqualThan(a *IntEvaluator, b *IntArrayEvaluator, opts *Opts, state *state) (*BoolEvaluator, error)

func ArrayIntLesserThan 

func ArrayIntLesserThan(a *IntEvaluator, b *IntArrayEvaluator, opts *Opts, state *state) (*BoolEvaluator, error)

func ArrayIntMatches 

func ArrayIntMatches(a *IntArrayEvaluator, b *IntArrayEvaluator, opts *Opts, state *state) (*BoolEvaluator, error)

ArrayIntMatches weak comparison, a least one element of a should be in b

func ArrayStringContains 

func ArrayStringContains(a *StringEvaluator, b *StringArrayEvaluator, opts *Opts, state *state) (*BoolEvaluator, error)

ArrayStringContains evaluates array of strings against a value

func ArrayStringMatches 

func ArrayStringMatches(a *StringArrayEvaluator, b *StringArrayEvaluator, opts *Opts, state *state) (*BoolEvaluator, error)

ArrayStringMatches weak comparison, a least one element of a should be in b. a can't contain regexp

func BoolEquals 

func BoolEquals(a *BoolEvaluator, b *BoolEvaluator, opts *Opts, state *state) (*BoolEvaluator, error)

func DurationGreaterOrEqualThan 

func DurationGreaterOrEqualThan(a *IntEvaluator, b *IntEvaluator, opts *Opts, state *state) (*BoolEvaluator, error)

func DurationGreaterThan 

func DurationGreaterThan(a *IntEvaluator, b *IntEvaluator, opts *Opts, state *state) (*BoolEvaluator, error)

func DurationLesserOrEqualThan 

func DurationLesserOrEqualThan(a *IntEvaluator, b *IntEvaluator, opts *Opts, state *state) (*BoolEvaluator, error)

func DurationLesserThan 

func DurationLesserThan(a *IntEvaluator, b *IntEvaluator, opts *Opts, state *state) (*BoolEvaluator, error)

func GreaterOrEqualThan 

func GreaterOrEqualThan(a *IntEvaluator, b *IntEvaluator, opts *Opts, state *state) (*BoolEvaluator, error)

func GreaterThan 

func GreaterThan(a *IntEvaluator, b *IntEvaluator, opts *Opts, state *state) (*BoolEvaluator, error)

func IntEquals 

func IntEquals(a *IntEvaluator, b *IntEvaluator, opts *Opts, state *state) (*BoolEvaluator, error)

func LesserOrEqualThan 

func LesserOrEqualThan(a *IntEvaluator, b *IntEvaluator, opts *Opts, state *state) (*BoolEvaluator, error)

func LesserThan 

func LesserThan(a *IntEvaluator, b *IntEvaluator, opts *Opts, state *state) (*BoolEvaluator, error)

func Not 

func Not(a *BoolEvaluator, opts *Opts, state *state) *BoolEvaluator

Not - !true operator

func Or 

func Or(a *BoolEvaluator, b *BoolEvaluator, opts *Opts, state *state) (*BoolEvaluator, error)

func StringEquals 

func StringEquals(a *StringEvaluator, b *StringEvaluator, opts *Opts, state *state) (*BoolEvaluator, error)

StringEquals evaluates string

func (*BoolEvaluator) Eval 

func (b *BoolEvaluator) Eval(ctx *Context) interface{}

Eval returns the result of the evaluation

func (*BoolEvaluator) GetField 

func (b *BoolEvaluator) GetField() string

GetField returns field name used by this evaluator

func (*BoolEvaluator) IsPartial 

func (b *BoolEvaluator) IsPartial() bool

IsPartial returns whether the evaluator is partial

func (*BoolEvaluator) IsScalar 

func (b *BoolEvaluator) IsScalar() bool

IsScalar returns whether the evaluator is a scalar

type Context 

type Context struct {
	Object unsafe.Pointer

	Registers Registers

	// cache available across all the evaluations
	Cache map[string]unsafe.Pointer
	// contains filtered or unexported fields
}

Context describes the context used during a rule evaluation

func NewContext 

func NewContext(obj unsafe.Pointer) *Context

NewContext return a new Context

func (*Context) Now 

func (c *Context) Now() time.Time

Now return and cache the `now` timestamp

func (*Context) Reset 

func (c *Context) Reset()

Reset the context

func (*Context) SetObject 

func (c *Context) SetObject(obj unsafe.Pointer)

SetObject set the given object to the context

type ContextPool 

type ContextPool struct {
	// contains filtered or unexported fields
}

ContextPool defines a pool of context

func NewContextPool 

func NewContextPool() *ContextPool

NewContextPool returns a new context pool

func (*ContextPool) Get 

func (c *ContextPool) Get(obj unsafe.Pointer) *Context

Get returns a context with the given object

func (*ContextPool) Put 

func (c *ContextPool) Put(ctx *Context)

Put returns the context to the pool

type ErrAstToEval 

type ErrAstToEval struct {
	Pos  lexer.Position
	Text string
}

ErrAstToEval describes an error that occurred during the conversion from the AST to an evaluator

func NewError 

func NewError(pos lexer.Position, text string) *ErrAstToEval

NewError returns a new ErrAstToEval error

func NewOpError 

func NewOpError(pos lexer.Position, op string, err error) *ErrAstToEval

NewOpError returns a new ErrAstToEval error when an operator was used in an invalid manner

func NewOpUnknownError 

func NewOpUnknownError(pos lexer.Position, op string) *ErrAstToEval

NewOpUnknownError returns a new ErrAstToEval error when an unknown operator was used

func NewRegisterMultipleFields 

func NewRegisterMultipleFields(pos lexer.Position, regID RegisterID, err error) *ErrAstToEval

NewRegisterMultipleFields returns a new ErrAstToEval error when a register is used across multiple fields

func NewRegisterNameNotAllowed 

func NewRegisterNameNotAllowed(pos lexer.Position, regID RegisterID, err error) *ErrAstToEval

NewRegisterNameNotAllowed returns a new ErrAstToEval error when a register name is not allowed

func NewTypeError 

func NewTypeError(pos lexer.Position, kind reflect.Kind) *ErrAstToEval

NewTypeError returns a new ErrAstToEval error when an invalid type was used

func (*ErrAstToEval) Error 

func (r *ErrAstToEval) Error() string

type ErrFieldNotFound 

type ErrFieldNotFound struct {
	Field string
}

ErrFieldNotFound error when a field is not present in the model

func (ErrFieldNotFound) Error 

func (e ErrFieldNotFound) Error() string

type ErrInvalidPattern 

type ErrInvalidPattern struct {
	Pattern string
}

ErrInvalidPattern is returned for an invalid regular expression

func (ErrInvalidPattern) Error 

func (e ErrInvalidPattern) Error() string

type ErrInvalidRegexp 

type ErrInvalidRegexp struct {
	Regexp string
}

ErrInvalidRegexp is returned for an invalid regular expression

func (ErrInvalidRegexp) Error 

func (e ErrInvalidRegexp) Error() string

type ErrIteratorNotSupported 

type ErrIteratorNotSupported struct {
	Field string
}

ErrIteratorNotSupported error when a field doesn't support iteration

func (ErrIteratorNotSupported) Error 

func (e ErrIteratorNotSupported) Error() string

type ErrNonStaticPattern 

type ErrNonStaticPattern struct {
	Field Field
}

ErrNonStaticPattern when pattern operator is used on a non static value

func (ErrNonStaticPattern) Error 

func (e ErrNonStaticPattern) Error() string

type ErrNotSupported 

type ErrNotSupported struct {
	Field string
}

ErrNotSupported returned when something is not supported on a field

func (ErrNotSupported) Error 

func (e ErrNotSupported) Error() string

type ErrRuleParse 

type ErrRuleParse struct {
	// contains filtered or unexported fields
}

ErrRuleParse describes a parsing error and its position in the expression

func (*ErrRuleParse) Error 

func (e *ErrRuleParse) Error() string

type ErrValueTypeMismatch 

type ErrValueTypeMismatch struct {
	Field string
}

ErrValueTypeMismatch error when the given value is not having the correct type

func (ErrValueTypeMismatch) Error 

func (e ErrValueTypeMismatch) Error() string

type Evaluator 

type Evaluator interface {
	Eval(ctx *Context) interface{}
	IsPartial() bool
	GetField() string
	IsScalar() bool
}

Evaluator is the interface of an evaluator

type EvaluatorStringer 

type EvaluatorStringer struct {
	Ctx       *Context
	Evaluator Evaluator
}

EvaluatorStringer implements the stringer in order to show the result of an evaluation. Should probably used only for logging

type Event 

type Event interface {
	// GetType returns the Type of the Event
	GetType() EventType
	// GetFieldEventType returns the Event Type for the given Field
	GetFieldEventType(field Field) (EventType, error)
	// SetFieldValue sets the value of the given Field
	SetFieldValue(field Field, value interface{}) error
	// GetFieldValue returns the value of the given Field
	GetFieldValue(field Field) (interface{}, error)
	// GetFieldType returns the Type of the Field
	GetFieldType(field Field) (reflect.Kind, error)
	// GetPointer returns an unsafe.Pointer of this object
	GetPointer() unsafe.Pointer
	// GetTags returns a list of tags
	GetTags() []string
}

Event is an interface that an Event has to implement for the evaluation

type EventType 

type EventType = string

EventType is the type of an event

type Field 

type Field = string

Field name

type FieldValue 

type FieldValue struct {
	Value interface{}
	Type  FieldValueType

	Regex *regexp.Regexp
}

FieldValue describes a field value with its type

type FieldValueType 

type FieldValueType int

FieldValueType represents the type of the value of a field 

const (
	ScalarValueType  FieldValueType = 1 << 0
	PatternValueType FieldValueType = 1 << 1
	RegexpValueType  FieldValueType = 1 << 2
	BitmaskValueType FieldValueType = 1 << 3
)

Field value types

type IntArrayEvaluator 

type IntArrayEvaluator struct {
	EvalFnc func(ctx *Context) []int
	Field   Field
	Values  []int
	Weight  int
	// contains filtered or unexported fields
}

IntArrayEvaluator returns an array of int

func (*IntArrayEvaluator) Eval 

func (i *IntArrayEvaluator) Eval(ctx *Context) interface{}

Eval returns the result of the evaluation

func (*IntArrayEvaluator) GetField 

func (i *IntArrayEvaluator) GetField() string

GetField returns field name used by this evaluator

func (*IntArrayEvaluator) IsPartial 

func (i *IntArrayEvaluator) IsPartial() bool

IsPartial returns whether the evaluator is partial

func (*IntArrayEvaluator) IsScalar 

func (i *IntArrayEvaluator) IsScalar() bool

IsScalar returns whether the evaluator is a scalar

type IntEvaluator 

type IntEvaluator struct {
	EvalFnc func(ctx *Context) int
	Field   Field
	Value   int
	Weight  int
	// contains filtered or unexported fields
}

IntEvaluator returns an int as result of the evaluation

func IntAnd 

func IntAnd(a *IntEvaluator, b *IntEvaluator, opts *Opts, state *state) (*IntEvaluator, error)

func IntNot 

func IntNot(a *IntEvaluator, opts *Opts, state *state) *IntEvaluator

IntNot - ^int operator

func IntOr 

func IntOr(a *IntEvaluator, b *IntEvaluator, opts *Opts, state *state) (*IntEvaluator, error)

func IntXor 

func IntXor(a *IntEvaluator, b *IntEvaluator, opts *Opts, state *state) (*IntEvaluator, error)

func Minus 

func Minus(a *IntEvaluator, opts *Opts, state *state) *IntEvaluator

Minus - -int operator

func (*IntEvaluator) Eval 

func (i *IntEvaluator) Eval(ctx *Context) interface{}

Eval returns the result of the evaluation

func (*IntEvaluator) GetField 

func (i *IntEvaluator) GetField() string

GetField returns field name used by this evaluator

func (*IntEvaluator) IsPartial 

func (i *IntEvaluator) IsPartial() bool

IsPartial returns whether the evaluator is partial

func (*IntEvaluator) IsScalar 

func (i *IntEvaluator) IsScalar() bool

IsScalar returns whether the evaluator is a scalar

type Iterator 

type Iterator interface {
	Front(ctx *Context) unsafe.Pointer
	Next() unsafe.Pointer
}

Iterator interface of a field iterator

type Macro 

type Macro struct {
	ID         MacroID
	Expression string
	Opts       *Opts
	// contains filtered or unexported fields
}

Macro - Macro object identified by an `ID` containing a SECL `Expression`

func (*Macro) GenEvaluator 

func (m *Macro) GenEvaluator(model Model, opts *Opts) error

GenEvaluator - Compiles and generates the evalutor

func (*Macro) GetAst 

func (m *Macro) GetAst() *ast.Macro

GetAst - Returns the representation of the SECL `Expression`

func (*Macro) GetEvaluator 

func (m *Macro) GetEvaluator() *MacroEvaluator

GetEvaluator - Returns the MacroEvaluator of the Macro corresponding to the SECL `Expression`

func (*Macro) GetEventTypes 

func (m *Macro) GetEventTypes() []EventType

GetEventTypes - Returns a list of all the Event Type that the `Expression` handles

func (*Macro) GetFields 

func (m *Macro) GetFields() []Field

GetFields - Returns all the Field that the Macro handles included sub-Macro

func (*Macro) Parse 

func (m *Macro) Parse() error

Parse - Transforms the SECL `Expression` into its AST representation

type MacroEvaluator 

type MacroEvaluator struct {
	Value       interface{}
	EventTypes  []EventType
	FieldValues map[Field][]FieldValue
}

MacroEvaluator - Evaluation part of a Macro

func (*MacroEvaluator) GetFields 

func (m *MacroEvaluator) GetFields() []Field

GetFields - Returns all the Field that the MacroEvaluator handles

type MacroID 

type MacroID = string

MacroID - ID of a Macro

type Model 

type Model interface {
	// GetEvaluator returns an evaluator for the given field
	GetEvaluator(field Field, regID RegisterID) (Evaluator, error)
	// ValidateField returns whether the value use against the field is valid, ex: for constant
	ValidateField(field Field, value FieldValue) error
	// GetIterator return an iterator
	GetIterator(field Field) (Iterator, error)
	// NewEvent returns a new event instance
	NewEvent() Event
}

Model - interface that a model has to implement for the rule compilation

type Opts 

type Opts struct {
	LegacyAttributes map[Field]Field
	Constants        map[string]interface{}
	Macros           map[MacroID]*Macro
}

Opts are the options to be passed to the evaluator

type Register 

type Register struct {
	Value unsafe.Pointer
	// contains filtered or unexported fields
}

Register describes a register that can be used by a set

type RegisterID 

type RegisterID = string

RegisterID identify a register ID

type Registers 

type Registers map[RegisterID]*Register

Registers defines all available registers

func (Registers) Clone 

func (r Registers) Clone() Registers

Clone returns a copy of the registers

type Rule 

type Rule struct {
	ID         RuleID
	Expression string
	Tags       []string
	Opts       *Opts
	Model      Model
	// contains filtered or unexported fields
}

Rule - Rule object identified by an `ID` containing a SECL `Expression`

func (*Rule) Eval 

func (r *Rule) Eval(ctx *Context) bool

Eval - Evaluates

func (*Rule) GenEvaluator 

func (r *Rule) GenEvaluator(model Model, opts *Opts) error

GenEvaluator - Compile and generates the RuleEvaluator

func (*Rule) GenPartials 

func (r *Rule) GenPartials() error

GenPartials - Compiles and generates partial Evaluators

func (*Rule) GetAst 

func (r *Rule) GetAst() *ast.Rule

GetAst - Returns the representation of the SECL `Expression`

func (*Rule) GetEvaluator 

func (r *Rule) GetEvaluator() *RuleEvaluator

GetEvaluator - Returns the RuleEvaluator of the Rule corresponding to the SECL `Expression`

func (*Rule) GetEventTypes 

func (r *Rule) GetEventTypes() []EventType

GetEventTypes - Returns a list of all the event that the `Expression` handles

func (*Rule) GetFieldValues 

func (r *Rule) GetFieldValues(field Field) []FieldValue

GetFieldValues returns the values of the given field

func (*Rule) GetFields 

func (r *Rule) GetFields() []Field

GetFields - Returns all the Field of the Rule including field of the Macro used

func (*Rule) GetPartialEval 

func (r *Rule) GetPartialEval(field Field) BoolEvalFnc

GetPartialEval - Returns the Partial RuleEvaluator for the given Field

func (*Rule) Parse 

func (r *Rule) Parse() error

Parse - Transforms the SECL `Expression` into its AST representation

func (*Rule) PartialEval 

func (r *Rule) PartialEval(ctx *Context, field Field) (bool, error)

PartialEval - Partial evaluation with the given Field

type RuleEvaluator 

type RuleEvaluator struct {
	Eval        BoolEvalFnc
	EventTypes  []EventType
	FieldValues map[Field][]FieldValue
	// contains filtered or unexported fields
}

RuleEvaluator - Evaluation part of a Rule

func (*RuleEvaluator) GetFields 

func (r *RuleEvaluator) GetFields() []Field

GetFields - Returns all the Field that the RuleEvaluator handles

func (*RuleEvaluator) PartialEval 

func (r *RuleEvaluator) PartialEval(ctx *Context, field Field) (bool, error)

PartialEval partially evaluation of the Rule with the given Field.

type RuleID 

type RuleID = string

RuleID - ID of a Rule

type StringArrayEvaluator 

type StringArrayEvaluator struct {
	EvalFnc func(ctx *Context) []string
	Field   Field
	Values  []string
	Weight  int
	// contains filtered or unexported fields
}

StringArrayEvaluator returns an array of strings

func (*StringArrayEvaluator) Eval 

func (s *StringArrayEvaluator) Eval(ctx *Context) interface{}

Eval returns the result of the evaluation

func (*StringArrayEvaluator) GetField 

func (s *StringArrayEvaluator) GetField() string

GetField returns field name used by this evaluator

func (*StringArrayEvaluator) IsPartial 

func (s *StringArrayEvaluator) IsPartial() bool

IsPartial returns whether the evaluator is partial

func (*StringArrayEvaluator) IsScalar 

func (s *StringArrayEvaluator) IsScalar() bool

IsScalar returns whether the evaluator is a scalar

type StringEvaluator 

type StringEvaluator struct {
	EvalFnc func(ctx *Context) string
	Field   Field
	Value   string
	Weight  int
	// contains filtered or unexported fields
}

StringEvaluator returns a string as result of the evaluation

func (*StringEvaluator) Eval 

func (s *StringEvaluator) Eval(ctx *Context) interface{}

Eval returns the result of the evaluation

func (*StringEvaluator) GetField 

func (s *StringEvaluator) GetField() string

GetField returns field name used by this evaluator

func (*StringEvaluator) IsPartial 

func (s *StringEvaluator) IsPartial() bool

IsPartial returns whether the evaluator is partial

func (*StringEvaluator) IsScalar 

func (s *StringEvaluator) IsScalar() bool

IsScalar returns whether the evaluator is a scalar

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