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31 lines
1.2 KiB
Go
31 lines
1.2 KiB
Go
// Copyright (c) The OpenTofu Authors
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// SPDX-License-Identifier: MPL-2.0
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// Copyright (c) 2023 HashiCorp, Inc.
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// SPDX-License-Identifier: MPL-2.0
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package tofu
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import (
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"github.com/opentofu/opentofu/internal/addrs"
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"github.com/opentofu/opentofu/internal/tfdiags"
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)
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// GraphWalker is an interface that can be implemented that when used
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// with Graph.Walk will invoke the given callbacks under certain events.
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type GraphWalker interface {
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EvalContext() EvalContext
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EnterPath(addrs.ModuleInstance) EvalContext
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ExitPath(addrs.ModuleInstance)
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Execute(EvalContext, GraphNodeExecutable) tfdiags.Diagnostics
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}
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// NullGraphWalker is a GraphWalker implementation that does nothing.
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// This can be embedded within other GraphWalker implementations for easily
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// implementing all the required functions.
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type NullGraphWalker struct{}
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func (NullGraphWalker) EvalContext() EvalContext { return new(MockEvalContext) }
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func (NullGraphWalker) EnterPath(addrs.ModuleInstance) EvalContext { return new(MockEvalContext) }
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func (NullGraphWalker) ExitPath(addrs.ModuleInstance) {}
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func (NullGraphWalker) Execute(EvalContext, GraphNodeExecutable) tfdiags.Diagnostics { return nil }
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