backend/init: add atlas, remove legacy atlas remote state
This commit is contained in:
Mitchell Hashimoto
parent
d00d6bc7fe
commit
942572b574
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@ -7,6 +7,7 @@ import (
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"github.com/hashicorp/terraform/backend"
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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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backendconsul "github.com/hashicorp/terraform/backend/remote-state/consul"
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@ -31,6 +32,7 @@ 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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@ -1,366 +0,0 @@
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package remote
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import (
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"bytes"
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"crypto/md5"
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"crypto/tls"
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"crypto/x509"
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"encoding/base64"
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"fmt"
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"io"
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"log"
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"net/http"
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"net/url"
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"os"
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"path"
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"strings"
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"github.com/hashicorp/go-cleanhttp"
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"github.com/hashicorp/go-retryablehttp"
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"github.com/hashicorp/go-rootcerts"
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"github.com/hashicorp/terraform/terraform"
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)
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const (
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// defaultAtlasServer is used when no address is given
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defaultAtlasServer = "https://atlas.hashicorp.com/"
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atlasTokenHeader = "X-Atlas-Token"
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)
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func atlasFactory(conf map[string]string) (Client, error) {
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var client AtlasClient
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server, ok := conf["address"]
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if !ok || server == "" {
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server = defaultAtlasServer
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}
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url, err := url.Parse(server)
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if err != nil {
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return nil, err
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}
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token, ok := conf["access_token"]
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if token == "" {
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token = os.Getenv("ATLAS_TOKEN")
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ok = true
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}
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if !ok || token == "" {
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return nil, fmt.Errorf(
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"missing 'access_token' configuration or ATLAS_TOKEN environmental variable")
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}
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name, ok := conf["name"]
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if !ok || name == "" {
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return nil, fmt.Errorf("missing 'name' configuration")
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}
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parts := strings.Split(name, "/")
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if len(parts) != 2 {
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return nil, fmt.Errorf("malformed name '%s', expected format '<account>/<name>'", name)
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}
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// If it exists, add the `ATLAS_RUN_ID` environment
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// variable as a param, which is injected during Atlas Terraform
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// runs. This is completely optional.
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client.RunId = os.Getenv("ATLAS_RUN_ID")
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client.Server = server
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client.ServerURL = url
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client.AccessToken = token
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client.User = parts[0]
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client.Name = parts[1]
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return &client, nil
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}
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// AtlasClient implements the Client interface for an Atlas compatible server.
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type AtlasClient struct {
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Server string
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ServerURL *url.URL
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User string
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Name string
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AccessToken string
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RunId string
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HTTPClient *retryablehttp.Client
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conflictHandlingAttempted bool
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}
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func (c *AtlasClient) Get() (*Payload, error) {
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// Make the HTTP request
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req, err := retryablehttp.NewRequest("GET", c.url().String(), nil)
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if err != nil {
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return nil, fmt.Errorf("Failed to make HTTP request: %v", err)
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}
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req.Header.Set(atlasTokenHeader, c.AccessToken)
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// Request the url
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client, err := c.http()
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if err != nil {
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return nil, err
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}
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resp, err := client.Do(req)
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if err != nil {
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return nil, err
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}
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defer resp.Body.Close()
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// Handle the common status codes
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switch resp.StatusCode {
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case http.StatusOK:
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// Handled after
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case http.StatusNoContent:
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return nil, nil
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case http.StatusNotFound:
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return nil, nil
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case http.StatusUnauthorized:
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return nil, fmt.Errorf("HTTP remote state endpoint requires auth")
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case http.StatusForbidden:
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return nil, fmt.Errorf("HTTP remote state endpoint invalid auth")
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case http.StatusInternalServerError:
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return nil, fmt.Errorf("HTTP remote state internal server error")
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default:
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return nil, fmt.Errorf(
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"Unexpected HTTP response code: %d\n\nBody: %s",
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resp.StatusCode, c.readBody(resp.Body))
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}
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// Read in the body
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buf := bytes.NewBuffer(nil)
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if _, err := io.Copy(buf, resp.Body); err != nil {
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return nil, fmt.Errorf("Failed to read remote state: %v", err)
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}
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// Create the payload
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payload := &Payload{
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Data: buf.Bytes(),
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}
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if len(payload.Data) == 0 {
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return nil, nil
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}
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// Check for the MD5
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if raw := resp.Header.Get("Content-MD5"); raw != "" {
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md5, err := base64.StdEncoding.DecodeString(raw)
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if err != nil {
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return nil, fmt.Errorf("Failed to decode Content-MD5 '%s': %v", raw, err)
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}
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payload.MD5 = md5
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} else {
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// Generate the MD5
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hash := md5.Sum(payload.Data)
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payload.MD5 = hash[:]
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}
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return payload, nil
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}
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func (c *AtlasClient) Put(state []byte) error {
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// Get the target URL
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base := c.url()
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// Generate the MD5
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hash := md5.Sum(state)
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b64 := base64.StdEncoding.EncodeToString(hash[:])
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// Make the HTTP client and request
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req, err := retryablehttp.NewRequest("PUT", base.String(), bytes.NewReader(state))
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if err != nil {
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return fmt.Errorf("Failed to make HTTP request: %v", err)
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}
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// Prepare the request
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req.Header.Set(atlasTokenHeader, c.AccessToken)
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req.Header.Set("Content-MD5", b64)
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req.Header.Set("Content-Type", "application/json")
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req.ContentLength = int64(len(state))
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// Make the request
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client, err := c.http()
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if err != nil {
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return err
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}
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resp, err := client.Do(req)
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if err != nil {
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return fmt.Errorf("Failed to upload state: %v", err)
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}
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defer resp.Body.Close()
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// Handle the error codes
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switch resp.StatusCode {
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case http.StatusOK:
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return nil
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case http.StatusConflict:
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return c.handleConflict(c.readBody(resp.Body), state)
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default:
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return fmt.Errorf(
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"HTTP error: %d\n\nBody: %s",
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resp.StatusCode, c.readBody(resp.Body))
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}
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}
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func (c *AtlasClient) Delete() error {
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// Make the HTTP request
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req, err := retryablehttp.NewRequest("DELETE", c.url().String(), nil)
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if err != nil {
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return fmt.Errorf("Failed to make HTTP request: %v", err)
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}
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req.Header.Set(atlasTokenHeader, c.AccessToken)
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// Make the request
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client, err := c.http()
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if err != nil {
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return err
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}
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resp, err := client.Do(req)
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if err != nil {
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return fmt.Errorf("Failed to delete state: %v", err)
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}
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defer resp.Body.Close()
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// Handle the error codes
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switch resp.StatusCode {
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case http.StatusOK:
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return nil
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case http.StatusNoContent:
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return nil
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case http.StatusNotFound:
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return nil
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default:
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return fmt.Errorf(
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"HTTP error: %d\n\nBody: %s",
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resp.StatusCode, c.readBody(resp.Body))
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}
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}
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func (c *AtlasClient) readBody(b io.Reader) string {
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var buf bytes.Buffer
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if _, err := io.Copy(&buf, b); err != nil {
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return fmt.Sprintf("Error reading body: %s", err)
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}
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result := buf.String()
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if result == "" {
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result = "<empty>"
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}
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return result
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}
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func (c *AtlasClient) url() *url.URL {
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values := url.Values{}
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values.Add("atlas_run_id", c.RunId)
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return &url.URL{
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Scheme: c.ServerURL.Scheme,
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Host: c.ServerURL.Host,
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Path: path.Join("api/v1/terraform/state", c.User, c.Name),
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RawQuery: values.Encode(),
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}
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}
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func (c *AtlasClient) http() (*retryablehttp.Client, error) {
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if c.HTTPClient != nil {
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return c.HTTPClient, nil
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}
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tlsConfig := &tls.Config{}
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err := rootcerts.ConfigureTLS(tlsConfig, &rootcerts.Config{
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CAFile: os.Getenv("ATLAS_CAFILE"),
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CAPath: os.Getenv("ATLAS_CAPATH"),
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})
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if err != nil {
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return nil, err
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}
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rc := retryablehttp.NewClient()
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rc.CheckRetry = func(resp *http.Response, err error) (bool, error) {
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if err != nil {
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// don't bother retrying if the certs don't match
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if err, ok := err.(*url.Error); ok {
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if _, ok := err.Err.(x509.UnknownAuthorityError); ok {
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return false, nil
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}
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}
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// continue retrying
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return true, nil
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}
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return retryablehttp.DefaultRetryPolicy(resp, err)
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}
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t := cleanhttp.DefaultTransport()
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t.TLSClientConfig = tlsConfig
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rc.HTTPClient.Transport = t
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c.HTTPClient = rc
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return rc, nil
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}
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// Atlas returns an HTTP 409 - Conflict if the pushed state reports the same
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// Serial number but the checksum of the raw content differs. This can
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// sometimes happen when Terraform changes state representation internally
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// between versions in a way that's semantically neutral but affects the JSON
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// output and therefore the checksum.
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//
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// Here we detect and handle this situation by ticking the serial and retrying
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// iff for the previous state and the proposed state:
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//
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// * the serials match
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// * the parsed states are Equal (semantically equivalent)
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//
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// In other words, in this situation Terraform can override Atlas's detected
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// conflict by asserting that the state it is pushing is indeed correct.
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func (c *AtlasClient) handleConflict(msg string, state []byte) error {
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log.Printf("[DEBUG] Handling Atlas conflict response: %s", msg)
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if c.conflictHandlingAttempted {
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log.Printf("[DEBUG] Already attempted conflict resolution; returning conflict.")
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} else {
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c.conflictHandlingAttempted = true
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log.Printf("[DEBUG] Atlas reported conflict, checking for equivalent states.")
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payload, err := c.Get()
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if err != nil {
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return conflictHandlingError(err)
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}
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currentState, err := terraform.ReadState(bytes.NewReader(payload.Data))
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if err != nil {
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return conflictHandlingError(err)
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}
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proposedState, err := terraform.ReadState(bytes.NewReader(state))
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if err != nil {
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return conflictHandlingError(err)
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}
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if statesAreEquivalent(currentState, proposedState) {
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log.Printf("[DEBUG] States are equivalent, incrementing serial and retrying.")
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proposedState.Serial++
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var buf bytes.Buffer
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if err := terraform.WriteState(proposedState, &buf); err != nil {
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return conflictHandlingError(err)
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}
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return c.Put(buf.Bytes())
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} else {
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log.Printf("[DEBUG] States are not equivalent, returning conflict.")
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}
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}
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return fmt.Errorf(
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"Atlas detected a remote state conflict.\n\nMessage: %s", msg)
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}
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func conflictHandlingError(err error) error {
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return fmt.Errorf(
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"Error while handling a conflict response from Atlas: %s", err)
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}
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func statesAreEquivalent(current, proposed *terraform.State) bool {
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return current.Serial == proposed.Serial && current.Equal(proposed)
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}
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@ -1,385 +0,0 @@
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package remote
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import (
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"bytes"
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"crypto/md5"
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"crypto/tls"
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"crypto/x509"
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"encoding/json"
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"net/http"
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"net/http/httptest"
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"net/url"
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"os"
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"testing"
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"time"
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"github.com/hashicorp/terraform/helper/acctest"
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"github.com/hashicorp/terraform/terraform"
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)
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func TestAtlasClient_impl(t *testing.T) {
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var _ Client = new(AtlasClient)
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}
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func TestAtlasClient(t *testing.T) {
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acctest.RemoteTestPrecheck(t)
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token := os.Getenv("ATLAS_TOKEN")
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if token == "" {
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t.Skipf("skipping, ATLAS_TOKEN must be set")
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}
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client, err := atlasFactory(map[string]string{
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"access_token": token,
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"name": "hashicorp/test-remote-state",
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})
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if err != nil {
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t.Fatalf("bad: %s", err)
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}
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testClient(t, client)
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}
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func TestAtlasClient_noRetryOnBadCerts(t *testing.T) {
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acctest.RemoteTestPrecheck(t)
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client, err := atlasFactory(map[string]string{
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"access_token": "NOT_REQUIRED",
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"name": "hashicorp/test-remote-state",
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})
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if err != nil {
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t.Fatalf("bad: %s", err)
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}
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ac := client.(*AtlasClient)
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// trigger the AtlasClient to build the http client and assign HTTPClient
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httpClient, err := ac.http()
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if err != nil {
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t.Fatal(err)
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}
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// remove the CA certs from the client
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brokenCfg := &tls.Config{
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RootCAs: new(x509.CertPool),
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}
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httpClient.HTTPClient.Transport.(*http.Transport).TLSClientConfig = brokenCfg
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// Instrument CheckRetry to make sure we didn't retry
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retries := 0
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oldCheck := httpClient.CheckRetry
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httpClient.CheckRetry = func(resp *http.Response, err error) (bool, error) {
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if retries > 0 {
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t.Fatal("retried after certificate error")
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}
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retries++
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return oldCheck(resp, err)
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}
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_, err = client.Get()
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if err != nil {
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if err, ok := err.(*url.Error); ok {
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if _, ok := err.Err.(x509.UnknownAuthorityError); ok {
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return
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}
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}
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}
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t.Fatalf("expected x509.UnknownAuthorityError, got %v", err)
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}
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func TestAtlasClient_ReportedConflictEqualStates(t *testing.T) {
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fakeAtlas := newFakeAtlas(t, testStateModuleOrderChange)
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srv := fakeAtlas.Server()
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defer srv.Close()
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client, err := atlasFactory(map[string]string{
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"access_token": "sometoken",
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"name": "someuser/some-test-remote-state",
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"address": srv.URL,
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})
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if err != nil {
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t.Fatalf("err: %s", err)
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}
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state, err := terraform.ReadState(bytes.NewReader(testStateModuleOrderChange))
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if err != nil {
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t.Fatalf("err: %s", err)
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}
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var stateJson bytes.Buffer
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if err := terraform.WriteState(state, &stateJson); err != nil {
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t.Fatalf("err: %s", err)
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}
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if err := client.Put(stateJson.Bytes()); err != nil {
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t.Fatalf("err: %s", err)
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}
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}
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func TestAtlasClient_NoConflict(t *testing.T) {
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fakeAtlas := newFakeAtlas(t, testStateSimple)
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srv := fakeAtlas.Server()
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defer srv.Close()
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client, err := atlasFactory(map[string]string{
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"access_token": "sometoken",
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"name": "someuser/some-test-remote-state",
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"address": srv.URL,
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})
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if err != nil {
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t.Fatalf("err: %s", err)
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}
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|
||||
state, err := terraform.ReadState(bytes.NewReader(testStateSimple))
|
||||
if err != nil {
|
||||
t.Fatalf("err: %s", err)
|
||||
}
|
||||
|
||||
fakeAtlas.NoConflictAllowed(true)
|
||||
|
||||
var stateJson bytes.Buffer
|
||||
if err := terraform.WriteState(state, &stateJson); err != nil {
|
||||
t.Fatalf("err: %s", err)
|
||||
}
|
||||
|
||||
if err := client.Put(stateJson.Bytes()); err != nil {
|
||||
t.Fatalf("err: %s", err)
|
||||
}
|
||||
}
|
||||
|
||||
func TestAtlasClient_LegitimateConflict(t *testing.T) {
|
||||
fakeAtlas := newFakeAtlas(t, testStateSimple)
|
||||
srv := fakeAtlas.Server()
|
||||
defer srv.Close()
|
||||
client, err := atlasFactory(map[string]string{
|
||||
"access_token": "sometoken",
|
||||
"name": "someuser/some-test-remote-state",
|
||||
"address": srv.URL,
|
||||
})
|
||||
if err != nil {
|
||||
t.Fatalf("err: %s", err)
|
||||
}
|
||||
|
||||
state, err := terraform.ReadState(bytes.NewReader(testStateSimple))
|
||||
if err != nil {
|
||||
t.Fatalf("err: %s", err)
|
||||
}
|
||||
|
||||
var buf bytes.Buffer
|
||||
terraform.WriteState(state, &buf)
|
||||
|
||||
// Changing the state but not the serial. Should generate a conflict.
|
||||
state.RootModule().Outputs["drift"] = &terraform.OutputState{
|
||||
Type: "string",
|
||||
Sensitive: false,
|
||||
Value: "happens",
|
||||
}
|
||||
|
||||
var stateJson bytes.Buffer
|
||||
if err := terraform.WriteState(state, &stateJson); err != nil {
|
||||
t.Fatalf("err: %s", err)
|
||||
}
|
||||
if err := client.Put(stateJson.Bytes()); err == nil {
|
||||
t.Fatal("Expected error from state conflict, got none.")
|
||||
}
|
||||
}
|
||||
|
||||
func TestAtlasClient_UnresolvableConflict(t *testing.T) {
|
||||
fakeAtlas := newFakeAtlas(t, testStateSimple)
|
||||
|
||||
// Something unexpected causes Atlas to conflict in a way that we can't fix.
|
||||
fakeAtlas.AlwaysConflict(true)
|
||||
|
||||
srv := fakeAtlas.Server()
|
||||
defer srv.Close()
|
||||
client, err := atlasFactory(map[string]string{
|
||||
"access_token": "sometoken",
|
||||
"name": "someuser/some-test-remote-state",
|
||||
"address": srv.URL,
|
||||
})
|
||||
if err != nil {
|
||||
t.Fatalf("err: %s", err)
|
||||
}
|
||||
|
||||
state, err := terraform.ReadState(bytes.NewReader(testStateSimple))
|
||||
if err != nil {
|
||||
t.Fatalf("err: %s", err)
|
||||
}
|
||||
|
||||
var stateJson bytes.Buffer
|
||||
if err := terraform.WriteState(state, &stateJson); err != nil {
|
||||
t.Fatalf("err: %s", err)
|
||||
}
|
||||
doneCh := make(chan struct{})
|
||||
go func() {
|
||||
defer close(doneCh)
|
||||
if err := client.Put(stateJson.Bytes()); err == nil {
|
||||
t.Fatal("Expected error from state conflict, got none.")
|
||||
}
|
||||
}()
|
||||
|
||||
select {
|
||||
case <-doneCh:
|
||||
// OK
|
||||
case <-time.After(500 * time.Millisecond):
|
||||
t.Fatalf("Timed out after 500ms, probably because retrying infinitely.")
|
||||
}
|
||||
}
|
||||
|
||||
// Stub Atlas HTTP API for a given state JSON string; does checksum-based
|
||||
// conflict detection equivalent to Atlas's.
|
||||
type fakeAtlas struct {
|
||||
state []byte
|
||||
t *testing.T
|
||||
|
||||
// Used to test that we only do the special conflict handling retry once.
|
||||
alwaysConflict bool
|
||||
|
||||
// Used to fail the test immediately if a conflict happens.
|
||||
noConflictAllowed bool
|
||||
}
|
||||
|
||||
func newFakeAtlas(t *testing.T, state []byte) *fakeAtlas {
|
||||
return &fakeAtlas{
|
||||
state: state,
|
||||
t: t,
|
||||
}
|
||||
}
|
||||
|
||||
func (f *fakeAtlas) Server() *httptest.Server {
|
||||
return httptest.NewServer(http.HandlerFunc(f.handler))
|
||||
}
|
||||
|
||||
func (f *fakeAtlas) CurrentState() *terraform.State {
|
||||
// we read the state manually here, because terraform may alter state
|
||||
// during read
|
||||
currentState := &terraform.State{}
|
||||
err := json.Unmarshal(f.state, currentState)
|
||||
if err != nil {
|
||||
f.t.Fatalf("err: %s", err)
|
||||
}
|
||||
return currentState
|
||||
}
|
||||
|
||||
func (f *fakeAtlas) CurrentSerial() int64 {
|
||||
return f.CurrentState().Serial
|
||||
}
|
||||
|
||||
func (f *fakeAtlas) CurrentSum() [md5.Size]byte {
|
||||
return md5.Sum(f.state)
|
||||
}
|
||||
|
||||
func (f *fakeAtlas) AlwaysConflict(b bool) {
|
||||
f.alwaysConflict = b
|
||||
}
|
||||
|
||||
func (f *fakeAtlas) NoConflictAllowed(b bool) {
|
||||
f.noConflictAllowed = b
|
||||
}
|
||||
|
||||
func (f *fakeAtlas) handler(resp http.ResponseWriter, req *http.Request) {
|
||||
// access tokens should only be sent as a header
|
||||
if req.FormValue("access_token") != "" {
|
||||
http.Error(resp, "access_token in request params", http.StatusBadRequest)
|
||||
return
|
||||
}
|
||||
|
||||
if req.Header.Get(atlasTokenHeader) == "" {
|
||||
http.Error(resp, "missing access token", http.StatusBadRequest)
|
||||
return
|
||||
}
|
||||
|
||||
switch req.Method {
|
||||
case "GET":
|
||||
// Respond with the current stored state.
|
||||
resp.Header().Set("Content-Type", "application/json")
|
||||
resp.Write(f.state)
|
||||
case "PUT":
|
||||
var buf bytes.Buffer
|
||||
buf.ReadFrom(req.Body)
|
||||
sum := md5.Sum(buf.Bytes())
|
||||
|
||||
// we read the state manually here, because terraform may alter state
|
||||
// during read
|
||||
state := &terraform.State{}
|
||||
err := json.Unmarshal(buf.Bytes(), state)
|
||||
if err != nil {
|
||||
f.t.Fatalf("err: %s", err)
|
||||
}
|
||||
|
||||
conflict := f.CurrentSerial() == state.Serial && f.CurrentSum() != sum
|
||||
conflict = conflict || f.alwaysConflict
|
||||
if conflict {
|
||||
if f.noConflictAllowed {
|
||||
f.t.Fatal("Got conflict when NoConflictAllowed was set.")
|
||||
}
|
||||
http.Error(resp, "Conflict", 409)
|
||||
} else {
|
||||
f.state = buf.Bytes()
|
||||
resp.WriteHeader(200)
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// This is a tfstate file with the module order changed, which is a structural
|
||||
// but not a semantic difference. Terraform will sort these modules as it
|
||||
// loads the state.
|
||||
var testStateModuleOrderChange = []byte(
|
||||
`{
|
||||
"version": 3,
|
||||
"serial": 1,
|
||||
"modules": [
|
||||
{
|
||||
"path": [
|
||||
"root",
|
||||
"child2",
|
||||
"grandchild"
|
||||
],
|
||||
"outputs": {
|
||||
"foo": {
|
||||
"sensitive": false,
|
||||
"type": "string",
|
||||
"value": "bar"
|
||||
}
|
||||
},
|
||||
"resources": null
|
||||
},
|
||||
{
|
||||
"path": [
|
||||
"root",
|
||||
"child1",
|
||||
"grandchild"
|
||||
],
|
||||
"outputs": {
|
||||
"foo": {
|
||||
"sensitive": false,
|
||||
"type": "string",
|
||||
"value": "bar"
|
||||
}
|
||||
},
|
||||
"resources": null
|
||||
}
|
||||
]
|
||||
}
|
||||
`)
|
||||
|
||||
var testStateSimple = []byte(
|
||||
`{
|
||||
"version": 3,
|
||||
"serial": 2,
|
||||
"lineage": "c00ad9ac-9b35-42fe-846e-b06f0ef877e9",
|
||||
"modules": [
|
||||
{
|
||||
"path": [
|
||||
"root"
|
||||
],
|
||||
"outputs": {
|
||||
"foo": {
|
||||
"sensitive": false,
|
||||
"type": "string",
|
||||
"value": "bar"
|
||||
}
|
||||
},
|
||||
"resources": {},
|
||||
"depends_on": []
|
||||
}
|
||||
]
|
||||
}
|
||||
`)
|
||||
|
|
@ -46,7 +46,6 @@ func NewClient(t string, conf map[string]string) (Client, error) {
|
|||
// NewClient.
|
||||
var BuiltinClients = map[string]Factory{
|
||||
"artifactory": artifactoryFactory,
|
||||
"atlas": atlasFactory,
|
||||
"azure": azureFactory,
|
||||
"etcd": etcdFactory,
|
||||
"gcs": gcsFactory,
|
||||
|
|
|
|||
Loading…
Reference in New Issue