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eval_lambda_node.go
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eval_lambda_node.go
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package stateful
import (
"fmt"
"regexp"
"time"
"github.com/influxdata/kapacitor/tick/ast"
)
type EvalLambdaNode struct {
nodeEvaluator NodeEvaluator
constReturnType ast.ValueType
state ExecutionState
}
func NewEvalLambdaNode(lambda *ast.LambdaNode) (*EvalLambdaNode, error) {
nodeEvaluator, err := createNodeEvaluator(lambda.Expression)
if err != nil {
return nil, fmt.Errorf("Failed to handle node: %v", err)
}
return &EvalLambdaNode{
nodeEvaluator: nodeEvaluator,
constReturnType: getConstantNodeType(lambda.Expression),
// Create an independent state for this expression
state: CreateExecutionState(),
}, nil
}
func (n *EvalLambdaNode) String() string {
return fmt.Sprintf("%s", n.nodeEvaluator)
}
func (n *EvalLambdaNode) Type(scope ReadOnlyScope) (ast.ValueType, error) {
if n.constReturnType == ast.InvalidType {
// We are dynamic and we need to figure out our type
// Do NOT cache this result in n.returnType since it can change.
return n.nodeEvaluator.Type(scope)
}
return n.constReturnType, nil
}
func (n *EvalLambdaNode) IsDynamic() bool {
return n.nodeEvaluator.IsDynamic()
}
func (n *EvalLambdaNode) EvalRegex(scope *Scope, _ ExecutionState) (*regexp.Regexp, error) {
typ, err := n.Type(scope)
if err != nil {
return nil, err
}
if typ == ast.TRegex {
return n.nodeEvaluator.EvalRegex(scope, n.state)
}
return nil, ErrTypeGuardFailed{RequestedType: ast.TRegex, ActualType: typ}
}
func (n *EvalLambdaNode) EvalTime(scope *Scope, _ ExecutionState) (time.Time, error) {
typ, err := n.Type(scope)
if err != nil {
return time.Time{}, err
}
return time.Time{}, ErrTypeGuardFailed{RequestedType: ast.TTime, ActualType: typ}
}
func (n *EvalLambdaNode) EvalDuration(scope *Scope, _ ExecutionState) (time.Duration, error) {
typ, err := n.Type(scope)
if err != nil {
return 0, err
}
if typ == ast.TDuration {
return n.nodeEvaluator.EvalDuration(scope, n.state)
}
return 0, ErrTypeGuardFailed{RequestedType: ast.TDuration, ActualType: typ}
}
func (n *EvalLambdaNode) EvalString(scope *Scope, _ ExecutionState) (string, error) {
typ, err := n.Type(scope)
if err != nil {
return "", err
}
if typ == ast.TString {
return n.nodeEvaluator.EvalString(scope, n.state)
}
return "", ErrTypeGuardFailed{RequestedType: ast.TString, ActualType: typ}
}
func (n *EvalLambdaNode) EvalFloat(scope *Scope, _ ExecutionState) (float64, error) {
typ, err := n.Type(scope)
if err != nil {
return 0, err
}
if typ == ast.TFloat {
return n.nodeEvaluator.EvalFloat(scope, n.state)
}
return 0, ErrTypeGuardFailed{RequestedType: ast.TFloat, ActualType: typ}
}
func (n *EvalLambdaNode) EvalInt(scope *Scope, _ ExecutionState) (int64, error) {
typ, err := n.Type(scope)
if err != nil {
return 0, err
}
if typ == ast.TInt {
return n.nodeEvaluator.EvalInt(scope, n.state)
}
return 0, ErrTypeGuardFailed{RequestedType: ast.TInt, ActualType: typ}
}
func (n *EvalLambdaNode) EvalBool(scope *Scope, _ ExecutionState) (bool, error) {
typ, err := n.Type(scope)
if err != nil {
return false, err
}
if typ == ast.TBool {
return n.nodeEvaluator.EvalBool(scope, n.state)
}
return false, ErrTypeGuardFailed{RequestedType: ast.TBool, ActualType: typ}
}
func (n *EvalLambdaNode) EvalMissing(scope *Scope, _ ExecutionState) (*ast.Missing, error) {
typ, err := n.Type(scope)
if err != nil {
return nil, err
}
if typ == ast.TMissing {
return n.nodeEvaluator.EvalMissing(scope, n.state)
}
return nil, ErrTypeGuardFailed{RequestedType: ast.TBool, ActualType: typ}
}