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graph_walk.go
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graph_walk.go
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package terraform
import (
"github.com/hashicorp/terraform/internal/addrs"
"github.com/hashicorp/terraform/internal/tfdiags"
)
// GraphWalker is an interface that can be implemented that when used
// with Graph.Walk will invoke the given callbacks under certain events.
type GraphWalker interface {
EvalContext() EvalContext
EnterPath(addrs.ModuleInstance) EvalContext
ExitPath(addrs.ModuleInstance)
Execute(EvalContext, GraphNodeExecutable) tfdiags.Diagnostics
}
// NullGraphWalker is a GraphWalker implementation that does nothing.
// This can be embedded within other GraphWalker implementations for easily
// implementing all the required functions.
type NullGraphWalker struct{}
func (NullGraphWalker) EvalContext() EvalContext { return new(MockEvalContext) }
func (NullGraphWalker) EnterPath(addrs.ModuleInstance) EvalContext { return new(MockEvalContext) }
func (NullGraphWalker) ExitPath(addrs.ModuleInstance) {}
func (NullGraphWalker) Execute(EvalContext, GraphNodeExecutable) tfdiags.Diagnostics { return nil }