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package terraform
import (
version "github.com/hashicorp/go-version"
"github.com/hashicorp/terraform/addrs"
"github.com/hashicorp/terraform/configs"
"github.com/hashicorp/terraform/moduledeps"
"github.com/hashicorp/terraform/plugin/discovery"
"github.com/hashicorp/terraform/states"
)
// ConfigTreeDependencies returns the dependencies of the tree of modules
// described by the given configuration and state.
//
// Both configuration and state are required because there can be resources
// implied by instances in the state that no longer exist in config.
func ConfigTreeDependencies(root *configs.Config, state *states.State) *moduledeps.Module {
// First we walk the configuration tree to build the overall structure
// and capture the explicit/implicit/inherited provider dependencies.
deps := configTreeConfigDependencies(root, nil)
// Next we walk over the resources in the state to catch any additional
// dependencies created by existing resources that are no longer in config.
// Most things we find in state will already be present in 'deps', but
// we're interested in the rare thing that isn't.
configTreeMergeStateDependencies(deps, state)
return deps
}
func configTreeConfigDependencies(root *configs.Config, inheritProviders map[string]*configs.Provider) *moduledeps.Module {
if root == nil {
// If no config is provided, we'll make a synthetic root.
// This isn't necessarily correct if we're called with a nil that
// *isn't* at the root, but in practice that can never happen.
return &moduledeps.Module{
Name: "root",
Providers: make(moduledeps.Providers),
}
}
name := "root"
if len(root.Path) != 0 {
name = root.Path[len(root.Path)-1]
}
ret := &moduledeps.Module{
Name: name,
}
module := root.Module
// Provider dependencies
{
providers := make(moduledeps.Providers)
// The main way to declare a provider dependency is explicitly inside
// the "terraform" block, which allows declaring a requirement without
// also creating a configuration.
for fullName, constraints := range module.ProviderRequirements {
inst := moduledeps.ProviderInstance(fullName)
// The handling here is a bit fiddly because the moduledeps package
// was designed around the legacy (pre-0.12) configuration model
// and hasn't yet been revised to handle the new model. As a result,
// we need to do some translation here.
// FIXME: Eventually we should adjust the underlying model so we
// can also retain the source location of each constraint, for
// more informative output from the "terraform providers" command.
var rawConstraints version.Constraints
for _, constraint := range constraints {
rawConstraints = append(rawConstraints, constraint.Required...)
}
discoConstraints := discovery.NewConstraints(rawConstraints)
providers[inst] = moduledeps.ProviderDependency{
Constraints: discoConstraints,
Reason: moduledeps.ProviderDependencyExplicit,
}
}
// Provider configurations can also include version constraints,
// allowing for more terse declaration in situations where both a
// configuration and a constraint are defined in the same module.
for fullName, pCfg := range module.ProviderConfigs {
inst := moduledeps.ProviderInstance(fullName)
discoConstraints := discovery.AllVersions
if pCfg.Version.Required != nil {
discoConstraints = discovery.NewConstraints(pCfg.Version.Required)
}
if existing, exists := providers[inst]; exists {
existing.Constraints = existing.Constraints.Append(discoConstraints)
} else {
providers[inst] = moduledeps.ProviderDependency{
Constraints: discoConstraints,
Reason: moduledeps.ProviderDependencyExplicit,
}
}
}
// Each resource in the configuration creates an *implicit* provider
// dependency, though we'll only record it if there isn't already
// an explicit dependency on the same provider.
for _, rc := range module.ManagedResources {
addr := rc.ProviderConfigAddr()
inst := moduledeps.ProviderInstance(addr.StringCompact())
if _, exists := providers[inst]; exists {
// Explicit dependency already present
continue
}
reason := moduledeps.ProviderDependencyImplicit
if _, inherited := inheritProviders[addr.StringCompact()]; inherited {
reason = moduledeps.ProviderDependencyInherited
}
providers[inst] = moduledeps.ProviderDependency{
Constraints: discovery.AllVersions,
Reason: reason,
}
}
for _, rc := range module.DataResources {
addr := rc.ProviderConfigAddr()
inst := moduledeps.ProviderInstance(addr.StringCompact())
if _, exists := providers[inst]; exists {
// Explicit dependency already present
continue
}
reason := moduledeps.ProviderDependencyImplicit
if _, inherited := inheritProviders[addr.String()]; inherited {
reason = moduledeps.ProviderDependencyInherited
}
providers[inst] = moduledeps.ProviderDependency{
Constraints: discovery.AllVersions,
Reason: reason,
}
}
ret.Providers = providers
}
childInherit := make(map[string]*configs.Provider)
for k, v := range inheritProviders {
childInherit[k] = v
}
for k, v := range module.ProviderConfigs {
childInherit[k] = v
}
for _, c := range root.Children {
ret.Children = append(ret.Children, configTreeConfigDependencies(c, childInherit))
}
return ret
}
func configTreeMergeStateDependencies(root *moduledeps.Module, state *states.State) {
if state == nil {
return
}
findModule := func(path addrs.ModuleInstance) *moduledeps.Module {
module := root
for _, step := range path {
var next *moduledeps.Module
for _, cm := range module.Children {
if cm.Name == step.Name {
next = cm
break
}
}
if next == nil {
// If we didn't find a next node, we'll need to make one
next = &moduledeps.Module{
Name: step.Name,
Providers: make(moduledeps.Providers),
}
module.Children = append(module.Children, next)
}
module = next
}
return module
}
for _, ms := range state.Modules {
module := findModule(ms.Addr)
for _, rs := range ms.Resources {
inst := moduledeps.ProviderInstance(rs.ProviderConfig.ProviderConfig.StringCompact())
if _, exists := module.Providers[inst]; !exists {
module.Providers[inst] = moduledeps.ProviderDependency{
Constraints: discovery.AllVersions,
Reason: moduledeps.ProviderDependencyFromState,
}
}
}
}
}
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