opentf/internal/tofu/context_plugins.go

// Copyright (c) The OpenTofu Authors
// SPDX-License-Identifier: MPL-2.0
// Copyright (c) 2023 HashiCorp, Inc.
// SPDX-License-Identifier: MPL-2.0

package tofu

import (
	"context"
	"fmt"

	"github.com/opentofu/opentofu/internal/addrs"
	"github.com/opentofu/opentofu/internal/configs/configschema"
	"github.com/opentofu/opentofu/internal/providers"
	"github.com/opentofu/opentofu/internal/provisioners"
	"github.com/opentofu/opentofu/internal/tfdiags"
)

// contextPlugins represents a library of available plugins (providers and
// provisioners) which we assume will all be used with the same
// tofu.Context, and thus it'll be safe to cache certain information
// about the providers for performance reasons.
type contextPlugins struct {
	providerFactories    map[addrs.Provider]providers.Factory
	provisionerFactories map[string]provisioners.Factory
	schemas              *Schemas
}

func newContextPlugins(providerFactories map[addrs.Provider]providers.Factory, provisionerFactories map[string]provisioners.Factory) (*contextPlugins, tfdiags.Diagnostics) {
	schemas, err := loadSchemas(context.TODO(), providerFactories, provisionerFactories)
	if err != nil {
		return nil, tfdiags.Diagnostics{}.Append(tfdiags.Sourceless(
			tfdiags.Error,
			"Failed to load plugin schemas",
			fmt.Sprintf("Error while loading schemas for plugin components: %s.", err),
		))
	}

	return &contextPlugins{
		providerFactories:    providerFactories,
		provisionerFactories: provisionerFactories,
		schemas:              schemas,
	}, nil
}

func (cp *contextPlugins) HasProvider(addr addrs.Provider) bool {
	_, ok := cp.providerFactories[addr]
	return ok
}

func (cp *contextPlugins) NewProviderInstance(addr addrs.Provider) (providers.Interface, error) {
	f, ok := cp.providerFactories[addr]
	if !ok {
		return nil, fmt.Errorf("unavailable provider %q", addr.String())
	}

	return f()

}

func (cp *contextPlugins) HasProvisioner(typ string) bool {
	_, ok := cp.provisionerFactories[typ]
	return ok
}

func (cp *contextPlugins) NewProvisionerInstance(typ string) (provisioners.Interface, error) {
	f, ok := cp.provisionerFactories[typ]
	if !ok {
		return nil, fmt.Errorf("unavailable provisioner %q", typ)
	}

	return f()
}

// ProviderSchema uses a temporary instance of the provider with the given
// address to obtain the full schema for all aspects of that provider.
//
// ProviderSchema memoizes results by unique provider address, so it's fine
// to repeatedly call this method with the same address if various different
// parts of OpenTofu all need the same schema information.
func (cp *contextPlugins) ProviderSchema(addr addrs.Provider) (providers.ProviderSchema, error) {
	schema, ok := cp.schemas.Providers[addr]
	if !ok {
		return schema, fmt.Errorf("unavailable provider %q", addr.String())
	}
	return schema, nil
}

// ProviderConfigSchema is a helper wrapper around ProviderSchema which first
// reads the full schema of the given provider and then extracts just the
// provider's configuration schema, which defines what's expected in a
// "provider" block in the configuration when configuring this provider.
func (cp *contextPlugins) ProviderConfigSchema(providerAddr addrs.Provider) (*configschema.Block, error) {
	providerSchema, err := cp.ProviderSchema(providerAddr)
	if err != nil {
		return nil, err
	}

	return providerSchema.Provider.Block, nil
}

// ResourceTypeSchema is a helper wrapper around ProviderSchema which first
// reads the schema of the given provider and then tries to find the schema
// for the resource type of the given resource mode in that provider.
//
// ResourceTypeSchema will return an error if the provider schema lookup
// fails, but will return nil if the provider schema lookup succeeds but then
// the provider doesn't have a resource of the requested type.
//
// Managed resource types have versioned schemas, so the second return value
// is the current schema version number for the requested resource. The version
// is irrelevant for other resource modes.
func (cp *contextPlugins) ResourceTypeSchema(providerAddr addrs.Provider, resourceMode addrs.ResourceMode, resourceType string) (*configschema.Block, uint64, error) {
	providerSchema, err := cp.ProviderSchema(providerAddr)
	if err != nil {
		return nil, 0, err
	}

	schema, version := providerSchema.SchemaForResourceType(resourceMode, resourceType)
	return schema, version, nil
}

// ProvisionerSchema uses a temporary instance of the provisioner with the
// given type name to obtain the schema for that provisioner's configuration.
//
// ProvisionerSchema memoizes results by provisioner type name, so it's fine
// to repeatedly call this method with the same name if various different
// parts of OpenTofu all need the same schema information.
func (cp *contextPlugins) ProvisionerSchema(typ string) (*configschema.Block, error) {
	schema, ok := cp.schemas.Provisioners[typ]
	if !ok {
		return schema, fmt.Errorf("unavailable provisioner %q", typ)
	}
	return schema, nil
}