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manager.go
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manager.go
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package terraform
import (
"bytes"
"errors"
"fmt"
"github.com/cloudfoundry/bosh-bootloader/storage"
"github.com/coreos/go-semver/semver"
)
type Manager struct {
executor executor
templateGenerator TemplateGenerator
inputGenerator InputGenerator
terraformOutputBuffer *bytes.Buffer
logger logger
}
type executor interface {
Version() (string, error)
Setup(terraformTemplate string, inputs map[string]interface{}) error
Init() error
Apply(credentials map[string]string) error
Validate(credentials map[string]string) error
Destroy(credentials map[string]string) error
Outputs() (map[string]interface{}, error)
Output(string) (string, error)
IsPaved() (bool, error)
}
type InputGenerator interface {
Generate(storage.State) (map[string]interface{}, error)
Credentials(state storage.State) map[string]string
}
type TemplateGenerator interface {
Generate(storage.State) string
}
type logger interface {
Step(string, ...interface{})
}
func NewManager(executor executor, templateGenerator TemplateGenerator, inputGenerator InputGenerator, terraformOutputBuffer *bytes.Buffer, logger logger) Manager {
return Manager{
executor: executor,
templateGenerator: templateGenerator,
inputGenerator: inputGenerator,
terraformOutputBuffer: terraformOutputBuffer,
logger: logger,
}
}
func (m Manager) Version() (string, error) {
return m.executor.Version()
}
func (m Manager) ValidateVersion() error {
version, err := m.executor.Version()
if err != nil {
return err
}
currentVersion, err := semver.NewVersion(version)
if err != nil {
return err
}
minimumVersion, err := semver.NewVersion("0.11.0")
if err != nil {
return err
}
if currentVersion.LessThan(*minimumVersion) {
return errors.New("Terraform version must be at least v0.11.0")
}
return nil
}
func (m Manager) Setup(bblState storage.State) error {
m.logger.Step("generating terraform template")
template := m.templateGenerator.Generate(bblState)
m.logger.Step("generating terraform variables")
input, err := m.inputGenerator.Generate(bblState)
if err != nil {
return fmt.Errorf("Input generator generate: %s", err)
}
if err := m.executor.Setup(template, input); err != nil {
return fmt.Errorf("Executor setup: %s", err)
}
return m.Init(bblState)
}
func (m Manager) Init(bblState storage.State) error {
m.logger.Step("terraform init")
if err := m.executor.Init(); err != nil {
return fmt.Errorf("Executor init: %s", err)
}
return nil
}
func (m Manager) Apply(bblState storage.State) (storage.State, error) {
m.logger.Step("terraform init")
if err := m.executor.Init(); err != nil {
return bblState, fmt.Errorf("Executor init: %s", err)
}
m.logger.Step("terraform apply")
err := m.executor.Apply(m.inputGenerator.Credentials(bblState))
bblState.LatestTFOutput = readAndReset(m.terraformOutputBuffer)
if err != nil {
return bblState, fmt.Errorf("Executor apply: %s", err)
}
return bblState, nil
}
func (m Manager) Destroy(bblState storage.State) (storage.State, error) {
m.logger.Step("terraform destroy")
err := m.executor.Destroy(m.inputGenerator.Credentials(bblState))
bblState.LatestTFOutput = readAndReset(m.terraformOutputBuffer)
if err != nil {
return bblState, fmt.Errorf("Executor destroy: %s", err)
}
m.logger.Step("finished destroying infrastructure")
return bblState, nil
}
func (m Manager) Validate(bblState storage.State) (storage.State, error) {
m.logger.Step("terraform validate")
err := m.executor.Validate(m.inputGenerator.Credentials(bblState))
bblState.LatestTFOutput = readAndReset(m.terraformOutputBuffer)
if err != nil {
return bblState, fmt.Errorf("Executor validate: %s", err)
}
return bblState, nil
}
func (m Manager) GetOutputs() (Outputs, error) {
tfOutputs, err := m.executor.Outputs()
if err != nil {
return Outputs{}, err
}
return Outputs{Map: tfOutputs}, nil
}
func (m Manager) IsPaved() (bool, error) {
return m.executor.IsPaved()
}
func readAndReset(buf *bytes.Buffer) string {
contents := buf.Bytes()
buf.Reset()
return string(contents)
}