terraform/backend/atlas/backend.go

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package atlas
import (
"fmt"
"net/url"
"os"
"strings"
"sync"
"github.com/hashicorp/terraform/tfdiags"
"github.com/zclconf/go-cty/cty"
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"github.com/hashicorp/terraform/backend"
"github.com/hashicorp/terraform/config/configschema"
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"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"
)
const EnvVarToken = "ATLAS_TOKEN"
const EnvVarAddress = "ATLAS_ADDRESS"
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// 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
// opLock locks operations
opLock sync.Mutex
}
func (b *Backend) ConfigSchema() *configschema.Block {
return &configschema.Block{
Attributes: map[string]*configschema.Attribute{
"name": {
Type: cty.String,
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Required: true,
Description: "Full name of the environment in Terraform Enterprise, such as 'myorg/myenv'",
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},
"access_token": {
Type: cty.String,
Optional: true,
Description: "Access token to use to access Terraform Enterprise; the ATLAS_TOKEN environment variable is used if this argument is not set",
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},
"address": {
Type: cty.String,
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Optional: true,
Description: "Base URL for your Terraform Enterprise installation; the ATLAS_ADDRESS environment variable is used if this argument is not set, finally falling back to a default of 'https://atlas.hashicorp.com/' if neither are set.",
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},
},
}
}
func (b *Backend) ValidateConfig(obj cty.Value) tfdiags.Diagnostics {
var diags tfdiags.Diagnostics
name := obj.GetAttr("name").AsString()
if ct := strings.Count(name, "/"); ct != 1 {
diags = diags.Append(tfdiags.AttributeValue(
tfdiags.Error,
"Invalid workspace selector",
`The "name" argument must be an organization name and a workspace name separated by a slash, such as "acme/network-production".`,
cty.Path{cty.GetAttrStep{Name: "name"}},
))
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}
if v := obj.GetAttr("address"); !v.IsNull() {
addr := v.AsString()
_, err := url.Parse(addr)
if err != nil {
diags = diags.Append(tfdiags.AttributeValue(
tfdiags.Error,
"Invalid Terraform Enterprise URL",
fmt.Sprintf(`The "address" argument must be a valid URL: %s.`, err),
cty.Path{cty.GetAttrStep{Name: "address"}},
))
}
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}
return diags
}
func (b *Backend) Configure(obj cty.Value) tfdiags.Diagnostics {
var diags tfdiags.Diagnostics
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client := &stateClient{
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// This is optionally set during Atlas Terraform runs.
RunId: os.Getenv("ATLAS_RUN_ID"),
}
name := obj.GetAttr("name").AsString() // assumed valid due to ValidateConfig method
slashIdx := strings.Index(name, "/")
client.User = name[:slashIdx]
client.Name = name[slashIdx+1:]
if v := obj.GetAttr("access_token"); !v.IsNull() {
client.AccessToken = v.AsString()
} else {
client.AccessToken = os.Getenv(EnvVarToken)
if client.AccessToken == "" {
diags = diags.Append(tfdiags.AttributeValue(
tfdiags.Error,
"Missing Terraform Enterprise access token",
`The "access_token" argument must be set unless the ATLAS_TOKEN environment variable is set to provide the authentication token for Terraform Enterprise.`,
cty.Path{cty.GetAttrStep{Name: "access_token"}},
))
}
}
if v := obj.GetAttr("address"); !v.IsNull() {
addr := v.AsString()
addrURL, err := url.Parse(addr)
if err != nil {
// We already validated the URL in ValidateConfig, so this shouldn't happen
panic(err)
}
client.Server = addr
client.ServerURL = addrURL
} else {
addr := os.Getenv(EnvVarAddress)
if addr == "" {
addr = defaultAtlasServer
}
addrURL, err := url.Parse(addr)
if err != nil {
diags = diags.Append(tfdiags.AttributeValue(
tfdiags.Error,
"Invalid Terraform Enterprise URL",
fmt.Sprintf(`The ATLAS_ADDRESS environment variable must contain a valid URL: %s.`, err),
cty.Path{cty.GetAttrStep{Name: "address"}},
))
}
client.Server = addr
client.ServerURL = addrURL
}
b.stateClient = client
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return diags
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}
func (b *Backend) States() ([]string, error) {
return nil, backend.ErrNamedStatesNotSupported
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}
func (b *Backend) DeleteState(name string) error {
return backend.ErrNamedStatesNotSupported
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}
func (b *Backend) State(name string) (state.State, error) {
if name != backend.DefaultStateName {
return nil, backend.ErrNamedStatesNotSupported
}
return &remote.State{Client: b.stateClient}, nil
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}
// 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,
}
}