Merge pull request hashicorp#12352 from hashicorp/f-atlas-backend

backend/atlas: convert to new style

backend/atlas/backend.go

@@ -0,0 +1,163 @@
+package atlas
+
+import (
+	"context"
+	"fmt"
+	"net/url"
+	"os"
+	"strings"
+	"sync"
+
+	"github.com/hashicorp/terraform/backend"
+	"github.com/hashicorp/terraform/helper/schema"
+	"github.com/hashicorp/terraform/state"
+	"github.com/hashicorp/terraform/state/remote"
+	"github.com/hashicorp/terraform/terraform"
+	"github.com/mitchellh/cli"
+	"github.com/mitchellh/colorstring"
+)
+
+// Backend is an implementation of EnhancedBackend that performs all operations
+// in Atlas. State must currently also be stored in Atlas, although it is worth
+// investigating in the future if state storage can be external as well.
+type Backend struct {
+	// CLI and Colorize control the CLI output. If CLI is nil then no CLI
+	// output will be done. If CLIColor is nil then no coloring will be done.
+	CLI      cli.Ui
+	CLIColor *colorstring.Colorize
+
+	// ContextOpts are the base context options to set when initializing a
+	// Terraform context. Many of these will be overridden or merged by
+	// Operation. See Operation for more details.
+	ContextOpts *terraform.ContextOpts
+
+	//---------------------------------------------------------------
+	// Internal fields, do not set
+	//---------------------------------------------------------------
+	// stateClient is the legacy state client, setup in Configure
+	stateClient *stateClient
+
+	// schema is the schema for configuration, set by init
+	schema *schema.Backend
+	once   sync.Once
+
+	// opLock locks operations
+	opLock sync.Mutex
+}
+
+func (b *Backend) Input(
+	ui terraform.UIInput, c *terraform.ResourceConfig) (*terraform.ResourceConfig, error) {
+	b.once.Do(b.init)
+	return b.schema.Input(ui, c)
+}
+
+func (b *Backend) Validate(c *terraform.ResourceConfig) ([]string, []error) {
+	b.once.Do(b.init)
+	return b.schema.Validate(c)
+}
+
+func (b *Backend) Configure(c *terraform.ResourceConfig) error {
+	b.once.Do(b.init)
+	return b.schema.Configure(c)
+}
+
+func (b *Backend) States() ([]string, error) {
+	return nil, backend.ErrNamedStatesNotSupported
+}
+
+func (b *Backend) DeleteState(name string) error {
+	return backend.ErrNamedStatesNotSupported
+}
+
+func (b *Backend) State(name string) (state.State, error) {
+	if name != backend.DefaultStateName {
+		return nil, backend.ErrNamedStatesNotSupported
+	}
+
+	return &remote.State{Client: b.stateClient}, nil
+}
+
+// Colorize returns the Colorize structure that can be used for colorizing
+// output. This is gauranteed to always return a non-nil value and so is useful
+// as a helper to wrap any potentially colored strings.
+func (b *Backend) Colorize() *colorstring.Colorize {
+	if b.CLIColor != nil {
+		return b.CLIColor
+	}
+
+	return &colorstring.Colorize{
+		Colors:  colorstring.DefaultColors,
+		Disable: true,
+	}
+}
+
+func (b *Backend) init() {
+	b.schema = &schema.Backend{
+		Schema: map[string]*schema.Schema{
+			"name": &schema.Schema{
+				Type:        schema.TypeString,
+				Required:    true,
+				Description: schemaDescriptions["name"],
+			},
+
+			"access_token": &schema.Schema{
+				Type:        schema.TypeString,
+				Required:    true,
+				Description: schemaDescriptions["access_token"],
+				DefaultFunc: schema.EnvDefaultFunc("ATLAS_TOKEN", nil),
+			},
+
+			"address": &schema.Schema{
+				Type:        schema.TypeString,
+				Optional:    true,
+				Default:     defaultAtlasServer,
+				Description: schemaDescriptions["address"],
+			},
+		},
+
+		ConfigureFunc: b.schemaConfigure,
+	}
+}
+
+func (b *Backend) schemaConfigure(ctx context.Context) error {
+	d := schema.FromContextBackendConfig(ctx)
+
+	// Parse the address
+	addr := d.Get("address").(string)
+	addrUrl, err := url.Parse(addr)
+	if err != nil {
+		return fmt.Errorf("Error parsing 'address': %s", err)
+	}
+
+	// Parse the org/env
+	name := d.Get("name").(string)
+	parts := strings.Split(name, "/")
+	if len(parts) != 2 {
+		return fmt.Errorf("malformed name '%s', expected format '<org>/<name>'", name)
+	}
+	org := parts[0]
+	env := parts[1]
+
+	// Setup the client
+	b.stateClient = &stateClient{
+		Server:      addr,
+		ServerURL:   addrUrl,
+		AccessToken: d.Get("access_token").(string),
+		User:        org,
+		Name:        env,
+
+		// This is optionally set during Atlas Terraform runs.
+		RunId: os.Getenv("ATLAS_RUN_ID"),
+	}
+
+	return nil
+}
+
+var schemaDescriptions = map[string]string{
+	"name": "Full name of the environment in Atlas, such as 'hashicorp/myenv'",
+	"access_token": "Access token to use to access Atlas. If ATLAS_TOKEN is set then\n" +
+		"this will override any saved value for this.",
+	"address": "Address to your Atlas installation. This defaults to the publicly\n" +
+		"hosted version at 'https://atlas.hashicorp.com/'. This address\n" +
+		"should contain the full HTTP scheme to use.",
+}

backend/atlas/backend_test.go

@@ -0,0 +1,12 @@
+package atlas
+
+import (
+	"testing"
+
+	"github.com/hashicorp/terraform/backend"
+)
+
+func TestImpl(t *testing.T) {
+	var _ backend.Backend = new(Backend)
+	var _ backend.CLI = new(Backend)
+}

backend/atlas/cli.go

@@ -0,0 +1,13 @@
+package atlas
+
+import (
+	"github.com/hashicorp/terraform/backend"
+)
+
+// backend.CLI impl.
+func (b *Backend) CLIInit(opts *backend.CLIOpts) error {
+	b.CLI = opts.CLI
+	b.CLIColor = opts.CLIColor
+	b.ContextOpts = opts.ContextOpts
+	return nil
+}

state/remote/atlas.go → backend/atlas/state_client.go

@@ -1,4 +1,4 @@
-package remote
+package atlas
 
 import (
 	"bytes"
@@ -13,11 +13,11 @@ import (
 	"net/url"
 	"os"
 	"path"
-	"strings"
 
 	"github.com/hashicorp/go-cleanhttp"
 	"github.com/hashicorp/go-retryablehttp"
 	"github.com/hashicorp/go-rootcerts"
+	"github.com/hashicorp/terraform/state/remote"
 	"github.com/hashicorp/terraform/terraform"
 )
 
@@ -27,55 +27,8 @@ const (
 	atlasTokenHeader   = "X-Atlas-Token"
 )
 
-func atlasFactory(conf map[string]string) (Client, error) {
-	var client AtlasClient
-
-	server, ok := conf["address"]
-	if !ok || server == "" {
-		server = defaultAtlasServer
-	}
-
-	url, err := url.Parse(server)
-	if err != nil {
-		return nil, err
-	}
-
-	token, ok := conf["access_token"]
-	if token == "" {
-		token = os.Getenv("ATLAS_TOKEN")
-		ok = true
-	}
-	if !ok || token == "" {
-		return nil, fmt.Errorf(
-			"missing 'access_token' configuration or ATLAS_TOKEN environmental variable")
-	}
-
-	name, ok := conf["name"]
-	if !ok || name == "" {
-		return nil, fmt.Errorf("missing 'name' configuration")
-	}
-
-	parts := strings.Split(name, "/")
-	if len(parts) != 2 {
-		return nil, fmt.Errorf("malformed name '%s', expected format '<account>/<name>'", name)
-	}
-
-	// If it exists, add the `ATLAS_RUN_ID` environment
-	// variable as a param, which is injected during Atlas Terraform
-	// runs. This is completely optional.
-	client.RunId = os.Getenv("ATLAS_RUN_ID")
-
-	client.Server = server
-	client.ServerURL = url
-	client.AccessToken = token
-	client.User = parts[0]
-	client.Name = parts[1]
-
-	return &client, nil
-}
-
 // AtlasClient implements the Client interface for an Atlas compatible server.
-type AtlasClient struct {
+type stateClient struct {
 	Server      string
 	ServerURL   *url.URL
 	User        string
@@ -87,7 +40,7 @@ type AtlasClient struct {
 	conflictHandlingAttempted bool
 }
 
-func (c *AtlasClient) Get() (*Payload, error) {
+func (c *stateClient) Get() (*remote.Payload, error) {
 	// Make the HTTP request
 	req, err := retryablehttp.NewRequest("GET", c.url().String(), nil)
 	if err != nil {
@@ -134,7 +87,7 @@ func (c *AtlasClient) Get() (*Payload, error) {
 	}
 
 	// Create the payload
-	payload := &Payload{
+	payload := &remote.Payload{
 		Data: buf.Bytes(),
 	}
 
@@ -159,7 +112,7 @@ func (c *AtlasClient) Get() (*Payload, error) {
 	return payload, nil
 }
 
-func (c *AtlasClient) Put(state []byte) error {
+func (c *stateClient) Put(state []byte) error {
 	// Get the target URL
 	base := c.url()
 
@@ -203,7 +156,7 @@ func (c *AtlasClient) Put(state []byte) error {
 	}
 }
 
-func (c *AtlasClient) Delete() error {
+func (c *stateClient) Delete() error {
 	// Make the HTTP request
 	req, err := retryablehttp.NewRequest("DELETE", c.url().String(), nil)
 	if err != nil {
@@ -237,7 +190,7 @@ func (c *AtlasClient) Delete() error {
 	}
 }
 
-func (c *AtlasClient) readBody(b io.Reader) string {
+func (c *stateClient) readBody(b io.Reader) string {
 	var buf bytes.Buffer
 	if _, err := io.Copy(&buf, b); err != nil {
 		return fmt.Sprintf("Error reading body: %s", err)
@@ -251,7 +204,7 @@ func (c *AtlasClient) readBody(b io.Reader) string {
 	return result
 }
 
-func (c *AtlasClient) url() *url.URL {
+func (c *stateClient) url() *url.URL {
 	values := url.Values{}
 
 	values.Add("atlas_run_id", c.RunId)
@@ -264,7 +217,7 @@ func (c *AtlasClient) url() *url.URL {
 	}
 }
 
-func (c *AtlasClient) http() (*retryablehttp.Client, error) {
+func (c *stateClient) http() (*retryablehttp.Client, error) {
 	if c.HTTPClient != nil {
 		return c.HTTPClient, nil
 	}
@@ -314,7 +267,7 @@ func (c *AtlasClient) http() (*retryablehttp.Client, error) {
 //
 // In other words, in this situation Terraform can override Atlas's detected
 // conflict by asserting that the state it is pushing is indeed correct.
-func (c *AtlasClient) handleConflict(msg string, state []byte) error {
+func (c *stateClient) handleConflict(msg string, state []byte) error {
 	log.Printf("[DEBUG] Handling Atlas conflict response: %s", msg)
 
 	if c.conflictHandlingAttempted {