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resource.go
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resource.go
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package terraform
import (
"fmt"
"reflect"
"strconv"
"strings"
"github.com/hashicorp/terraform/config"
)
// ResourceProvisionerConfig is used to pair a provisioner
// with its provided configuration. This allows us to use singleton
// instances of each ResourceProvisioner and to keep the relevant
// configuration instead of instantiating a new Provisioner for each
// resource.
type ResourceProvisionerConfig struct {
Type string
Provisioner ResourceProvisioner
Config *ResourceConfig
RawConfig *config.RawConfig
ConnInfo *config.RawConfig
}
// Resource encapsulates a resource, its configuration, its provider,
// its current state, and potentially a desired diff from the state it
// wants to reach.
type Resource struct {
Id string
Config *ResourceConfig
Diff *ResourceDiff
Provider ResourceProvider
State *ResourceState
Provisioners []*ResourceProvisionerConfig
Tainted bool
}
// Vars returns the mapping of variables that should be replaced in
// configuration based on the attributes of this resource.
func (r *Resource) Vars() map[string]string {
if r.State == nil {
return nil
}
vars := make(map[string]string)
for ak, av := range r.State.Attributes {
vars[fmt.Sprintf("%s.%s", r.Id, ak)] = av
}
return vars
}
// ResourceConfig holds the configuration given for a resource. This is
// done instead of a raw `map[string]interface{}` type so that rich
// methods can be added to it to make dealing with it easier.
type ResourceConfig struct {
ComputedKeys []string
Raw map[string]interface{}
Config map[string]interface{}
raw *config.RawConfig
}
// NewResourceConfig creates a new ResourceConfig from a config.RawConfig.
func NewResourceConfig(c *config.RawConfig) *ResourceConfig {
result := &ResourceConfig{raw: c}
result.interpolate(nil)
return result
}
// CheckSet checks that the given list of configuration keys is
// properly set. If not, errors are returned for each unset key.
//
// This is useful to be called in the Validate method of a ResourceProvider.
func (c *ResourceConfig) CheckSet(keys []string) []error {
var errs []error
for _, k := range keys {
if !c.IsSet(k) {
errs = append(errs, fmt.Errorf("%s must be set", k))
}
}
return errs
}
// Get looks up a configuration value by key and returns the value.
//
// The second return value is true if the get was successful. Get will
// not succeed if the value is being computed.
func (c *ResourceConfig) Get(k string) (interface{}, bool) {
// First try to get it from c.Config since that has interpolated values
result, ok := c.get(k, c.Config)
if ok {
return result, ok
}
// Otherwise, just get it from the raw config
return c.get(k, c.Raw)
}
// IsSet checks if the key in the configuration is set. A key is set if
// it has a value or the value is being computed (is unknown currently).
//
// This function should be used rather than checking the keys of the
// raw configuration itself, since a key may be omitted from the raw
// configuration if it is being computed.
func (c *ResourceConfig) IsSet(k string) bool {
if c == nil {
return false
}
for _, ck := range c.ComputedKeys {
if ck == k {
return true
}
}
if _, ok := c.Get(k); ok {
return true
}
return false
}
func (c *ResourceConfig) get(
k string, raw map[string]interface{}) (interface{}, bool) {
parts := strings.Split(k, ".")
var current interface{} = raw
for _, part := range parts {
if current == nil {
return nil, false
}
cv := reflect.ValueOf(current)
switch cv.Kind() {
case reflect.Map:
v := cv.MapIndex(reflect.ValueOf(part))
if !v.IsValid() {
return nil, false
}
current = v.Interface()
case reflect.Slice:
if part == "#" {
current = cv.Len()
} else {
i, err := strconv.ParseInt(part, 0, 0)
if err != nil {
return nil, false
}
if i >= int64(cv.Len()) {
return nil, false
}
current = cv.Index(int(i)).Interface()
}
default:
panic(fmt.Sprintf("Unknown kind: %s", cv.Kind()))
}
}
return current, true
}
func (c *ResourceConfig) interpolate(ctx *Context) error {
if c == nil {
return nil
}
if ctx != nil {
if err := ctx.computeVars(c.raw); err != nil {
return err
}
}
if c.raw != nil {
c.ComputedKeys = c.raw.UnknownKeys()
c.Raw = c.raw.Raw
c.Config = c.raw.Config()
}
return nil
}