func evalTypeDeclaration(node *ast.TypeDeclarationNode, scope *stateful.Scope, predefinedVars, defaultVars map[string]Var, ignoreMissingVars bool) error {
var actualType ast.ValueType
switch node.Type.Ident {
case "int":
actualType = ast.TInt
case "float":
actualType = ast.TFloat
case "bool":
actualType = ast.TBool
case "string":
actualType = ast.TString
case "regex":
actualType = ast.TRegex
case "duration":
actualType = ast.TDuration
case "lambda":
actualType = ast.TLambda
case "list":
actualType = ast.TList
case "star":
actualType = ast.TStar
default:
return fmt.Errorf("invalid var type %q", node.Type.Ident)
}
name := node.Node.Ident
desc := ""
if node.Comment != nil {
desc = node.Comment.CommentString()
}
defaultVars[name] = Var{
Type: actualType,
Value: nil,
Description: desc,
}
if predefinedValue, ok := predefinedVars[name]; ok {
if predefinedValue.Type != actualType {
return fmt.Errorf("invalid type supplied for %s, got %v exp %v", name, predefinedValue.Type, actualType)
}
v, err := convertVarToValue(Var{Value: predefinedValue.Value, Type: actualType})
if err != nil {
return err
}
scope.Set(name, v)
} else if ignoreMissingVars {
// Set zero value on scope, so execution can continue
scope.Set(name, ast.ZeroValue(actualType))
} else {
return fmt.Errorf("missing value for var %q.", name)
}
return nil
}
func createPipelineAndVars(
script string,
sourceEdge EdgeType,
scope *stateful.Scope,
deadman DeadmanService,
predefinedVars map[string]tick.Var,
ignoreMissingVars bool,
) (*Pipeline, map[string]tick.Var, error) {
p := &Pipeline{
deadman: deadman,
}
var src Node
switch sourceEdge {
case StreamEdge:
src = newStreamNode()
scope.Set("stream", src)
case BatchEdge:
src = newBatchNode()
scope.Set("batch", src)
default:
return nil, nil, fmt.Errorf("source edge type must be either Stream or Batch not %s", sourceEdge)
}
p.addSource(src)
vars, err := tick.Evaluate(script, scope, predefinedVars, ignoreMissingVars)
if err != nil {
return nil, nil, err
}
if deadman.Global() {
switch s := src.(type) {
case *StreamNode:
s.Deadman(deadman.Threshold(), deadman.Interval())
case *BatchNode:
s.Deadman(deadman.Threshold(), deadman.Interval())
default:
return nil, nil, fmt.Errorf("source edge type must be either Stream or Batch not %s", sourceEdge)
}
}
if err = p.Walk(
func(n Node) error {
return n.validate()
}); err != nil {
return nil, nil, err
}
return p, vars, nil
}
func evalDeclaration(node *ast.DeclarationNode, scope *stateful.Scope, stck *stack, predefinedVars, defaultVars map[string]Var) error {
name := node.Left.Ident
if v, _ := scope.Get(name); v != nil {
return fmt.Errorf("attempted to redefine %s, vars are immutable", name)
}
value := stck.Pop()
if i, ok := value.(*ast.IdentifierNode); ok {
// Resolve identifier
v, err := scope.Get(i.Ident)
if err != nil {
return err
}
value = v
}
actualType := ast.TypeOf(value)
// Populate set of default vars
if actualType != ast.InvalidType {
desc := ""
if node.Comment != nil {
desc = node.Comment.CommentString()
}
v, err := convertValueToVar(value, actualType, desc)
if err != nil {
return err
}
defaultVars[name] = v
}
// Populate scope, first check for predefined var
if predefinedValue, ok := predefinedVars[name]; ok {
if predefinedValue.Type != actualType {
return fmt.Errorf("invalid type supplied for %s, got %v exp %v", name, predefinedValue.Type, actualType)
}
v, err := convertVarToValue(Var{Value: predefinedValue.Value, Type: actualType})
if err != nil {
return err
}
value = v
}
scope.Set(name, value)
return nil
}
// fillScope - given a scope and reference variables, we fill the exact variables from the now, fields and tags.
func fillScope(vars *stateful.Scope, referenceVariables []string, now time.Time, fields models.Fields, tags models.Tags) error {
for _, refVariableName := range referenceVariables {
if refVariableName == "time" {
vars.Set("time", now.Local())
continue
}
// Support the error with tags/fields collision
var fieldValue interface{}
var isFieldExists bool
var tagValue interface{}
var isTagExists bool
if fieldValue, isFieldExists = fields[refVariableName]; isFieldExists {
vars.Set(refVariableName, fieldValue)
}
if tagValue, isTagExists = tags[refVariableName]; isTagExists {
if isFieldExists {
return fmt.Errorf("cannot have field and tags with same name %q", refVariableName)
}
vars.Set(refVariableName, tagValue)
}
if !isFieldExists && !isTagExists {
if !vars.Has(refVariableName) {
return fmt.Errorf("no field or tag exists for %s", refVariableName)
}
}
}
return nil
}