terraform/helper/schema/provider.go

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package schema
import (
"errors"
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"fmt"
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"sort"
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"github.com/hashicorp/terraform/terraform"
)
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// Provider represents a resource provider in Terraform, and properly
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// implements all of the ResourceProvider API.
//
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// By defining a schema for the configuration of the provider, the
// map of supporting resources, and a configuration function, the schema
// framework takes over and handles all the provider operations for you.
//
// After defining the provider structure, it is unlikely that you'll require any
// of the methods on Provider itself.
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type Provider struct {
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// Schema is the schema for the configuration of this provider. If this
// provider has no configuration, this can be omitted.
//
// The keys of this map are the configuration keys, and the value is
// the schema describing the value of the configuration.
Schema map[string]*Schema
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// ResourcesMap is the list of available resources that this provider
// can manage, along with their Resource structure defining their
// own schemas and CRUD operations.
//
// Provider automatically handles routing operations such as Apply,
// Diff, etc. to the proper resource.
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ResourcesMap map[string]*Resource
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// ConfigureFunc is a function for configuring the provider. If the
// provider doesn't need to be configured, this can be omitted.
//
// See the ConfigureFunc documentation for more information.
ConfigureFunc ConfigureFunc
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meta interface{}
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}
// ConfigureFunc is the function used to configure a Provider.
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//
// The interface{} value returned by this function is stored and passed into
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// the subsequent resources as the meta parameter. This return value is
// usually used to pass along a configured API client, a configuration
// structure, etc.
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type ConfigureFunc func(*ResourceData) (interface{}, error)
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// InternalValidate should be called to validate the structure
// of the provider.
//
// This should be called in a unit test for any provider to verify
// before release that a provider is properly configured for use with
// this library.
func (p *Provider) InternalValidate() error {
if p == nil {
return errors.New("provider is nil")
}
sm := schemaMap(p.Schema)
if err := sm.InternalValidate(sm); err != nil {
return err
}
for k, r := range p.ResourcesMap {
if err := r.InternalValidate(nil); err != nil {
return fmt.Errorf("%s: %s", k, err)
}
}
return nil
}
// Meta returns the metadata associated with this provider that was
// returned by the Configure call. It will be nil until Configure is called.
func (p *Provider) Meta() interface{} {
return p.meta
}
// SetMeta can be used to forcefully set the Meta object of the provider.
// Note that if Configure is called the return value will override anything
// set here.
func (p *Provider) SetMeta(v interface{}) {
p.meta = v
}
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// Input implementation of terraform.ResourceProvider interface.
func (p *Provider) Input(
input terraform.UIInput,
c *terraform.ResourceConfig) (*terraform.ResourceConfig, error) {
return schemaMap(p.Schema).Input(input, c)
}
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// Validate implementation of terraform.ResourceProvider interface.
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func (p *Provider) Validate(c *terraform.ResourceConfig) ([]string, []error) {
if err := p.InternalValidate(); err != nil {
return nil, []error{fmt.Errorf(
"Internal validation of the provider failed! This is always a bug\n"+
"with the provider itself, and not a user issue. Please report\n"+
"this bug:\n\n%s", err)}
}
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return schemaMap(p.Schema).Validate(c)
}
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// ValidateResource implementation of terraform.ResourceProvider interface.
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func (p *Provider) ValidateResource(
t string, c *terraform.ResourceConfig) ([]string, []error) {
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r, ok := p.ResourcesMap[t]
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if !ok {
return nil, []error{fmt.Errorf(
"Provider doesn't support resource: %s", t)}
}
return r.Validate(c)
}
// Configure implementation of terraform.ResourceProvider interface.
func (p *Provider) Configure(c *terraform.ResourceConfig) error {
// No configuration
if p.ConfigureFunc == nil {
return nil
}
sm := schemaMap(p.Schema)
// Get a ResourceData for this configuration. To do this, we actually
// generate an intermediary "diff" although that is never exposed.
diff, err := sm.Diff(nil, c)
if err != nil {
return err
}
data, err := sm.Data(nil, diff)
if err != nil {
return err
}
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meta, err := p.ConfigureFunc(data)
if err != nil {
return err
}
p.meta = meta
return nil
}
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// Apply implementation of terraform.ResourceProvider interface.
func (p *Provider) Apply(
info *terraform.InstanceInfo,
s *terraform.InstanceState,
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d *terraform.InstanceDiff) (*terraform.InstanceState, error) {
r, ok := p.ResourcesMap[info.Type]
if !ok {
return nil, fmt.Errorf("unknown resource type: %s", info.Type)
}
return r.Apply(s, d, p.meta)
}
// Diff implementation of terraform.ResourceProvider interface.
func (p *Provider) Diff(
info *terraform.InstanceInfo,
s *terraform.InstanceState,
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c *terraform.ResourceConfig) (*terraform.InstanceDiff, error) {
r, ok := p.ResourcesMap[info.Type]
if !ok {
return nil, fmt.Errorf("unknown resource type: %s", info.Type)
}
return r.Diff(s, c)
}
// Refresh implementation of terraform.ResourceProvider interface.
func (p *Provider) Refresh(
info *terraform.InstanceInfo,
s *terraform.InstanceState) (*terraform.InstanceState, error) {
r, ok := p.ResourcesMap[info.Type]
if !ok {
return nil, fmt.Errorf("unknown resource type: %s", info.Type)
}
return r.Refresh(s, p.meta)
}
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// Resources implementation of terraform.ResourceProvider interface.
func (p *Provider) Resources() []terraform.ResourceType {
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keys := make([]string, 0, len(p.ResourcesMap))
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for k, _ := range p.ResourcesMap {
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keys = append(keys, k)
}
sort.Strings(keys)
result := make([]terraform.ResourceType, 0, len(keys))
for _, k := range keys {
resource := p.ResourcesMap[k]
// This isn't really possible (it'd fail InternalValidate), but
// we do it anyways to avoid a panic.
if resource == nil {
resource = &Resource{}
}
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result = append(result, terraform.ResourceType{
Name: k,
Importable: resource.Importer != nil,
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})
}
return result
}
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func (p *Provider) ImportState(
info *terraform.InstanceInfo,
id string) ([]*terraform.InstanceState, error) {
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// Find the resource
r, ok := p.ResourcesMap[info.Type]
if !ok {
return nil, fmt.Errorf("unknown resource type: %s", info.Type)
}
// If it doesn't support import, error
if r.Importer == nil {
return nil, fmt.Errorf("resource %s doesn't support import", info.Type)
}
// Create the data
data := r.Data(nil)
data.SetId(id)
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data.SetType(info.Type)
// Call the import function
results := []*ResourceData{data}
if r.Importer.State != nil {
var err error
results, err = r.Importer.State(data, p.meta)
if err != nil {
return nil, err
}
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}
// Convert the results to InstanceState values and return it
states := make([]*terraform.InstanceState, len(results))
for i, r := range results {
states[i] = r.State()
}
// Verify that all are non-nil. If there are any nil the error
// isn't obvious so we circumvent that with a friendlier error.
for _, s := range states {
if s == nil {
return nil, fmt.Errorf(
"nil entry in ImportState results. This is always a bug with\n" +
"the resource that is being imported. Please report this as\n" +
"a bug to Terraform.")
}
}
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return states, nil
}