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c937c06a03
Due to how deeply the configuration types go into Terraform Core, there isn't a great way to switch out to HCL2 gradually. As a consequence, this huge commit gets us from the old state to a _compilable_ new state, but does not yet attempt to fix any tests and has a number of known missing parts and bugs. We will continue to iterate on this in forthcoming commits, heading back towards passing tests and making Terraform fully-functional again. The three main goals here are: - Use the configuration models from the "configs" package instead of the older models in the "config" package, which is now deprecated and preserved only to help us write our migration tool. - Do expression inspection and evaluation using the functionality of the new "lang" package, instead of the Interpolator type and related functionality in the main "terraform" package. - Represent addresses of various objects using types in the addrs package, rather than hand-constructed strings. This is not critical to support the above, but was a big help during the implementation of these other points since it made it much more explicit what kind of address is expected in each context. Since our new packages are built to accommodate some future planned features that are not yet implemented (e.g. the "for_each" argument on resources, "count"/"for_each" on modules), and since there's still a fair amount of functionality still using old-style APIs, there is a moderate amount of shimming here to connect new assumptions with old, hopefully in a way that makes it easier to find and eliminate these shims later. I apologize in advance to the person who inevitably just found this huge commit while spelunking through the commit history.
63 lines
2.4 KiB
Go
63 lines
2.4 KiB
Go
package terraform
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import (
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"github.com/hashicorp/terraform/addrs"
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"github.com/hashicorp/terraform/dag"
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"github.com/hashicorp/terraform/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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EnterPath(addrs.ModuleInstance) EvalContext
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ExitPath(addrs.ModuleInstance)
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EnterVertex(dag.Vertex)
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ExitVertex(dag.Vertex, tfdiags.Diagnostics)
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EnterEvalTree(dag.Vertex, EvalNode) EvalNode
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ExitEvalTree(dag.Vertex, interface{}, error) tfdiags.Diagnostics
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}
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// GrpahWalkerPanicwrapper can be optionally implemented to catch panics
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// that occur while walking the graph. This is not generally recommended
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// since panics should crash Terraform and result in a bug report. However,
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// this is particularly useful for situations like the shadow graph where
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// you don't ever want to cause a panic.
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type GraphWalkerPanicwrapper interface {
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GraphWalker
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// Panic is called when a panic occurs. This will halt the panic from
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// propogating so if the walker wants it to crash still it should panic
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// again. This is called from within a defer so runtime/debug.Stack can
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// be used to get the stack trace of the panic.
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Panic(dag.Vertex, interface{})
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}
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// GraphWalkerPanicwrap wraps an existing Graphwalker to wrap and swallow
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// the panics. This doesn't lose the panics since the panics are still
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// returned as errors as part of a graph walk.
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func GraphWalkerPanicwrap(w GraphWalker) GraphWalkerPanicwrapper {
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return &graphWalkerPanicwrapper{
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GraphWalker: w,
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}
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}
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type graphWalkerPanicwrapper struct {
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GraphWalker
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}
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func (graphWalkerPanicwrapper) Panic(dag.Vertex, interface{}) {}
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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) EnterPath(addrs.ModuleInstance) EvalContext { return new(MockEvalContext) }
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func (NullGraphWalker) ExitPath(addrs.ModuleInstance) {}
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func (NullGraphWalker) EnterVertex(dag.Vertex) {}
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func (NullGraphWalker) ExitVertex(dag.Vertex, tfdiags.Diagnostics) {}
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func (NullGraphWalker) EnterEvalTree(v dag.Vertex, n EvalNode) EvalNode { return n }
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func (NullGraphWalker) ExitEvalTree(dag.Vertex, interface{}, error) tfdiags.Diagnostics {
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return nil
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}
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