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backend.go
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backend.go
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package http
import (
"context"
"crypto/tls"
"fmt"
"net/http"
"net/url"
"time"
"github.com/hashicorp/go-cleanhttp"
"github.com/hashicorp/go-retryablehttp"
"github.com/hashicorp/terraform/backend"
"github.com/hashicorp/terraform/helper/schema"
"github.com/hashicorp/terraform/state"
"github.com/hashicorp/terraform/state/remote"
)
func New() backend.Backend {
s := &schema.Backend{
Schema: map[string]*schema.Schema{
"address": &schema.Schema{
Type: schema.TypeString,
Required: true,
Description: "The address of the REST endpoint",
},
"update_method": &schema.Schema{
Type: schema.TypeString,
Optional: true,
Default: "POST",
Description: "HTTP method to use when updating state",
},
"lock_address": &schema.Schema{
Type: schema.TypeString,
Optional: true,
Description: "The address of the lock REST endpoint",
},
"unlock_address": &schema.Schema{
Type: schema.TypeString,
Optional: true,
Description: "The address of the unlock REST endpoint",
},
"lock_method": &schema.Schema{
Type: schema.TypeString,
Optional: true,
Default: "LOCK",
Description: "The HTTP method to use when locking",
},
"unlock_method": &schema.Schema{
Type: schema.TypeString,
Optional: true,
Default: "UNLOCK",
Description: "The HTTP method to use when unlocking",
},
"username": &schema.Schema{
Type: schema.TypeString,
Optional: true,
Description: "The username for HTTP basic authentication",
},
"password": &schema.Schema{
Type: schema.TypeString,
Optional: true,
Description: "The password for HTTP basic authentication",
},
"skip_cert_verification": &schema.Schema{
Type: schema.TypeBool,
Optional: true,
Default: false,
Description: "Whether to skip TLS verification.",
},
"retry_max": &schema.Schema{
Type: schema.TypeInt,
Optional: true,
Default: 2,
Description: "The number of HTTP request retries.",
},
"retry_wait_min": &schema.Schema{
Type: schema.TypeInt,
Optional: true,
Default: 1,
Description: "The minimum time in seconds to wait between HTTP request attempts.",
},
"retry_wait_max": &schema.Schema{
Type: schema.TypeInt,
Optional: true,
Default: 30,
Description: "The maximum time in seconds to wait between HTTP request attempts.",
},
},
}
b := &Backend{Backend: s}
b.Backend.ConfigureFunc = b.configure
return b
}
type Backend struct {
*schema.Backend
client *httpClient
}
func (b *Backend) configure(ctx context.Context) error {
data := schema.FromContextBackendConfig(ctx)
address := data.Get("address").(string)
updateURL, err := url.Parse(address)
if err != nil {
return fmt.Errorf("failed to parse address URL: %s", err)
}
if updateURL.Scheme != "http" && updateURL.Scheme != "https" {
return fmt.Errorf("address must be HTTP or HTTPS")
}
updateMethod := data.Get("update_method").(string)
var lockURL *url.URL
if v, ok := data.GetOk("lock_address"); ok && v.(string) != "" {
var err error
lockURL, err = url.Parse(v.(string))
if err != nil {
return fmt.Errorf("failed to parse lockAddress URL: %s", err)
}
if lockURL.Scheme != "http" && lockURL.Scheme != "https" {
return fmt.Errorf("lockAddress must be HTTP or HTTPS")
}
}
lockMethod := data.Get("lock_method").(string)
var unlockURL *url.URL
if v, ok := data.GetOk("unlock_address"); ok && v.(string) != "" {
var err error
unlockURL, err = url.Parse(v.(string))
if err != nil {
return fmt.Errorf("failed to parse unlockAddress URL: %s", err)
}
if unlockURL.Scheme != "http" && unlockURL.Scheme != "https" {
return fmt.Errorf("unlockAddress must be HTTP or HTTPS")
}
}
unlockMethod := data.Get("unlock_method").(string)
client := cleanhttp.DefaultPooledClient()
if data.Get("skip_cert_verification").(bool) {
// ignores TLS verification
client.Transport.(*http.Transport).TLSClientConfig = &tls.Config{
InsecureSkipVerify: true,
}
}
rClient := retryablehttp.NewClient()
rClient.HTTPClient = client
rClient.RetryMax = data.Get("retry_max").(int)
rClient.RetryWaitMin = time.Duration(data.Get("retry_wait_min").(int)) * time.Second
rClient.RetryWaitMax = time.Duration(data.Get("retry_wait_max").(int)) * time.Second
b.client = &httpClient{
URL: updateURL,
UpdateMethod: updateMethod,
LockURL: lockURL,
LockMethod: lockMethod,
UnlockURL: unlockURL,
UnlockMethod: unlockMethod,
Username: data.Get("username").(string),
Password: data.Get("password").(string),
// accessible only for testing use
Client: rClient,
}
return nil
}
func (b *Backend) StateMgr(name string) (state.State, error) {
if name != backend.DefaultStateName {
return nil, backend.ErrWorkspacesNotSupported
}
return &remote.State{Client: b.client}, nil
}
func (b *Backend) StateMgrWithoutCheckVersion(name string) (state.State, error) {
return b.StateMgr(name)
}
func (b *Backend) Workspaces() ([]string, error) {
return nil, backend.ErrWorkspacesNotSupported
}
func (b *Backend) DeleteWorkspace(string) error {
return backend.ErrWorkspacesNotSupported
}