125 lines
4.7 KiB
Go
125 lines
4.7 KiB
Go
// Package init contains the list of backends that can be initialized and
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// basic helper functions for initializing those backends.
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package init
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import (
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"sync"
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"github.com/hashicorp/terraform/backend"
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"github.com/hashicorp/terraform/terraform"
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backendatlas "github.com/hashicorp/terraform/backend/atlas"
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backendlegacy "github.com/hashicorp/terraform/backend/legacy"
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backendlocal "github.com/hashicorp/terraform/backend/local"
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backendAzure "github.com/hashicorp/terraform/backend/remote-state/azure"
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backendconsul "github.com/hashicorp/terraform/backend/remote-state/consul"
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backendetcdv3 "github.com/hashicorp/terraform/backend/remote-state/etcdv3"
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backendGCS "github.com/hashicorp/terraform/backend/remote-state/gcs"
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backendinmem "github.com/hashicorp/terraform/backend/remote-state/inmem"
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backendManta "github.com/hashicorp/terraform/backend/remote-state/manta"
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backendS3 "github.com/hashicorp/terraform/backend/remote-state/s3"
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backendSwift "github.com/hashicorp/terraform/backend/remote-state/swift"
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)
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// backends is the list of available backends. This is a global variable
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// because backends are currently hardcoded into Terraform and can't be
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// modified without recompilation.
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//
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// To read an available backend, use the Backend function. This ensures
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// safe concurrent read access to the list of built-in backends.
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//
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// Backends are hardcoded into Terraform because the API for backends uses
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// complex structures and supporting that over the plugin system is currently
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// prohibitively difficult. For those wanting to implement a custom backend,
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// they can do so with recompilation.
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var backends map[string]func() backend.Backend
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var backendsLock sync.Mutex
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func init() {
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// Our hardcoded backends. We don't need to acquire a lock here
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// since init() code is serial and can't spawn goroutines.
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backends = map[string]func() backend.Backend{
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"atlas": func() backend.Backend { return &backendatlas.Backend{} },
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"local": func() backend.Backend { return &backendlocal.Local{} },
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"consul": func() backend.Backend { return backendconsul.New() },
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"inmem": func() backend.Backend { return backendinmem.New() },
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"swift": func() backend.Backend { return backendSwift.New() },
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"s3": func() backend.Backend { return backendS3.New() },
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"azure": deprecateBackend(backendAzure.New(),
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`Warning: "azure" name is deprecated, please use "azurerm"`),
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"azurerm": func() backend.Backend { return backendAzure.New() },
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"etcdv3": func() backend.Backend { return backendetcdv3.New() },
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"gcs": func() backend.Backend { return backendGCS.New() },
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"manta": func() backend.Backend { return backendManta.New() },
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}
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// Add the legacy remote backends that haven't yet been convertd to
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// the new backend API.
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backendlegacy.Init(backends)
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}
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// Backend returns the initialization factory for the given backend, or
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// nil if none exists.
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func Backend(name string) func() backend.Backend {
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backendsLock.Lock()
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defer backendsLock.Unlock()
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return backends[name]
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}
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// Set sets a new backend in the list of backends. If f is nil then the
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// backend will be removed from the map. If this backend already exists
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// then it will be overwritten.
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//
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// This method sets this backend globally and care should be taken to do
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// this only before Terraform is executing to prevent odd behavior of backends
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// changing mid-execution.
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func Set(name string, f func() backend.Backend) {
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backendsLock.Lock()
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defer backendsLock.Unlock()
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if f == nil {
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delete(backends, name)
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return
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}
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backends[name] = f
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}
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// deprecatedBackendShim is used to wrap a backend and inject a deprecation
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// warning into the Validate method.
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type deprecatedBackendShim struct {
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backend.Backend
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Message string
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}
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// Validate the Backend then add the deprecation warning.
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func (b deprecatedBackendShim) Validate(c *terraform.ResourceConfig) ([]string, []error) {
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warns, errs := b.Backend.Validate(c)
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warns = append(warns, b.Message)
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return warns, errs
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}
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// DeprecateBackend can be used to wrap a backend to retrun a deprecation
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// warning during validation.
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func deprecateBackend(b backend.Backend, message string) func() backend.Backend {
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// Since a Backend wrapped by deprecatedBackendShim can no longer be
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// asserted as an Enhanced or Local backend, disallow those types here
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// entirely. If something other than a basic backend.Backend needs to be
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// deprecated, we can add that functionality to schema.Backend or the
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// backend itself.
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if _, ok := b.(backend.Enhanced); ok {
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panic("cannot use DeprecateBackend on an Enhanced Backend")
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}
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if _, ok := b.(backend.Local); ok {
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panic("cannot use DeprecateBackend on a Local Backend")
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}
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return func() backend.Backend {
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return deprecatedBackendShim{
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Backend: b,
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Message: message,
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}
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}
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}
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