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config_argument.go
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/
config_argument.go
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package controller
import (
"fmt"
"sync"
"github.com/grafana/agent/pkg/river/ast"
"github.com/grafana/agent/pkg/river/vm"
)
type ArgumentConfigNode struct {
label string
nodeID string
componentName string
mut sync.RWMutex
block *ast.BlockStmt // Current River blocks to derive config from
eval *vm.Evaluator
defaultValue any
optional bool
}
var _ BlockNode = (*ArgumentConfigNode)(nil)
// NewArgumentConfigNode creates a new ArgumentConfigNode from an initial ast.BlockStmt.
// The underlying config isn't applied until Evaluate is called.
func NewArgumentConfigNode(block *ast.BlockStmt, globals ComponentGlobals) *ArgumentConfigNode {
return &ArgumentConfigNode{
label: block.Label,
nodeID: BlockComponentID(block).String(),
componentName: block.GetBlockName(),
block: block,
eval: vm.New(block.Body),
}
}
type argumentBlock struct {
Optional bool `river:"optional,attr,optional"`
Default any `river:"default,attr,optional"`
}
// Evaluate implements BlockNode and updates the arguments for the managed config block
// by re-evaluating its River block with the provided scope. The managed config block
// will be built the first time Evaluate is called.
//
// Evaluate will return an error if the River block cannot be evaluated or if
// decoding to arguments fails.
func (cn *ArgumentConfigNode) Evaluate(scope *vm.Scope) error {
cn.mut.Lock()
defer cn.mut.Unlock()
var argument argumentBlock
if err := cn.eval.Evaluate(scope, &argument); err != nil {
return fmt.Errorf("decoding River: %w", err)
}
cn.defaultValue = argument.Default
cn.optional = argument.Optional
return nil
}
func (cn *ArgumentConfigNode) Optional() bool {
cn.mut.RLock()
defer cn.mut.RUnlock()
return cn.optional
}
func (cn *ArgumentConfigNode) Default() any {
cn.mut.RLock()
defer cn.mut.RUnlock()
return cn.defaultValue
}
func (cn *ArgumentConfigNode) Label() string { return cn.label }
// Block implements BlockNode and returns the current block of the managed config node.
func (cn *ArgumentConfigNode) Block() *ast.BlockStmt {
cn.mut.RLock()
defer cn.mut.RUnlock()
return cn.block
}
// NodeID implements dag.Node and returns the unique ID for the config node.
func (cn *ArgumentConfigNode) NodeID() string { return cn.nodeID }