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eval_reference_node.go
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eval_reference_node.go
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package stateful
import (
"fmt"
"regexp"
"time"
"github.com/influxdata/kapacitor/tick/ast"
)
type EvalReferenceNode struct {
Node *ast.ReferenceNode
}
// getReferenceValue - core method for evaluating function where all NodeEvaluator methods should use
func (n *EvalReferenceNode) getReferenceValue(scope *Scope) (interface{}, error) {
value, err := scope.Get(n.Node.Reference)
if err != nil {
return nil, err
}
if value == nil {
return nil, fmt.Errorf("referenced value %q is nil.", n.Node.Reference)
}
return value, nil
}
func (n *EvalReferenceNode) String() string {
return "\"" + n.Node.Reference + "\""
}
func (n *EvalReferenceNode) Type(scope ReadOnlyScope) (ast.ValueType, error) {
value, err := n.getReferenceValue(scope.(*Scope))
if err != nil {
return ast.InvalidType, err
}
return ast.TypeOf(value), nil
}
func (n *EvalReferenceNode) IsDynamic() bool {
return true
}
func (n *EvalReferenceNode) EvalRegex(scope *Scope, executionState ExecutionState) (*regexp.Regexp, error) {
refValue, err := n.getReferenceValue(scope)
if err != nil {
return nil, err
}
if regexValue, isRegex := refValue.(*regexp.Regexp); isRegex {
return regexValue, nil
}
refType := ast.TypeOf(refValue)
if refType == ast.TMissing {
return nil, fmt.Errorf("reference \"%s\" is missing value", n.Node.Reference)
}
return nil, ErrTypeGuardFailed{RequestedType: ast.TRegex, ActualType: ast.TypeOf(refValue)}
}
func (n *EvalReferenceNode) EvalTime(scope *Scope, executionState ExecutionState) (time.Time, error) {
refValue, err := n.getReferenceValue(scope)
if err != nil {
return time.Time{}, err
}
if timeValue, isTime := refValue.(time.Time); isTime {
return timeValue, nil
}
refType := ast.TypeOf(refValue)
if refType == ast.TMissing {
return time.Time{}, fmt.Errorf("reference \"%s\" is missing value", n.Node.Reference)
}
return time.Time{}, ErrTypeGuardFailed{RequestedType: ast.TTime, ActualType: ast.TypeOf(refValue)}
}
func (n *EvalReferenceNode) EvalDuration(scope *Scope, executionState ExecutionState) (time.Duration, error) {
refValue, err := n.getReferenceValue(scope)
if err != nil {
return 0, err
}
if durValue, isDuration := refValue.(time.Duration); isDuration {
return durValue, nil
}
refType := ast.TypeOf(refValue)
if refType == ast.TMissing {
return 0, fmt.Errorf("reference \"%s\" is missing value", n.Node.Reference)
}
return 0, ErrTypeGuardFailed{RequestedType: ast.TDuration, ActualType: ast.TypeOf(refValue)}
}
func (n *EvalReferenceNode) EvalString(scope *Scope, executionState ExecutionState) (string, error) {
refValue, err := n.getReferenceValue(scope)
if err != nil {
return "", err
}
if stringValue, isString := refValue.(string); isString {
return stringValue, nil
}
refType := ast.TypeOf(refValue)
if refType == ast.TMissing {
return "", fmt.Errorf("reference \"%s\" is missing value", n.Node.Reference)
}
return "", ErrTypeGuardFailed{RequestedType: ast.TString, ActualType: ast.TypeOf(refValue)}
}
func (n *EvalReferenceNode) EvalFloat(scope *Scope, executionState ExecutionState) (float64, error) {
refValue, err := n.getReferenceValue(scope)
if err != nil {
return float64(0), err
}
if float64Value, isFloat64 := refValue.(float64); isFloat64 {
return float64Value, nil
}
refType := ast.TypeOf(refValue)
if refType == ast.TMissing {
return float64(0), fmt.Errorf("reference \"%s\" is missing value", n.Node.Reference)
}
return float64(0), ErrTypeGuardFailed{RequestedType: ast.TFloat, ActualType: ast.TypeOf(refValue)}
}
func (n *EvalReferenceNode) EvalInt(scope *Scope, executionState ExecutionState) (int64, error) {
refValue, err := n.getReferenceValue(scope)
if err != nil {
return int64(0), err
}
if int64Value, isInt64 := refValue.(int64); isInt64 {
return int64Value, nil
}
refType := ast.TypeOf(refValue)
if refType == ast.TMissing {
return int64(0), fmt.Errorf("reference \"%s\" is missing value", n.Node.Reference)
}
return int64(0), ErrTypeGuardFailed{RequestedType: ast.TInt, ActualType: ast.TypeOf(refValue)}
}
func (n *EvalReferenceNode) EvalBool(scope *Scope, executionState ExecutionState) (bool, error) {
refValue, err := n.getReferenceValue(scope)
if err != nil {
return false, err
}
if boolValue, isBool := refValue.(bool); isBool {
return boolValue, nil
}
refType := ast.TypeOf(refValue)
if refType == ast.TMissing {
return false, fmt.Errorf("reference \"%s\" is missing value", n.Node.Reference)
}
return false, ErrTypeGuardFailed{RequestedType: ast.TBool, ActualType: ast.TypeOf(refValue)}
}
func (n *EvalReferenceNode) EvalMissing(scope *Scope, executionState ExecutionState) (*ast.Missing, error) {
refValue, err := n.getReferenceValue(scope)
if err != nil {
return nil, err
}
if missingVal, isMissing := refValue.(*ast.Missing); isMissing {
// This error gets checked in the eval method of a function node
return missingVal, fmt.Errorf("missing value: \"%v\"", n.Node.Reference)
}
return nil, ErrTypeGuardFailed{RequestedType: ast.TMissing, ActualType: ast.TypeOf(refValue)}
}