/
plugin_terraform.go
473 lines (385 loc) · 12.6 KB
/
plugin_terraform.go
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package testkit
import (
"bytes"
"encoding/json"
"fmt"
"io"
"os"
"os/exec"
"path/filepath"
"strings"
"gopkg.in/yaml.v2"
)
type TerraformProvider struct {
// WorkspacePath is the path to the Terraform workspace.
WorkspacePath string
// Vars is the map of Terraform variables.
Vars map[string]string
// KubeconfigDir is the directory where the kubeconfig files for EKS clusters are stored.
KubeconfigDir string
tfShowJSONBytes []byte
}
var _ S3BucketProvider = &TerraformProvider{}
var _ EKSClusterProvider = &TerraformProvider{}
var _ KubernetesClusterProvider = &TerraformProvider{}
var _ Provider = &TerraformProvider{}
func (p *TerraformProvider) GetEKSCluster(opts ...EKSClusterOption) (*EKSCluster, error) {
if p.KubeconfigDir == "" {
return nil, fmt.Errorf("kubeconfigDir is not set")
}
resource, err := p.getEKSClusterResource()
if err != nil {
return nil, err
}
kubeconfigPath, err := p.generateKubeconfigFile(resource.tfEKSClusterValues)
if err != nil {
return nil, err
}
return &EKSCluster{
Endpoint: resource.tfEKSClusterValues.Endpoint,
KubeconfigPath: kubeconfigPath,
}, nil
}
func (p *TerraformProvider) GetKubernetesCluster(opts ...KubernetesClusterOption) (*KubernetesCluster, error) {
var conf KubernetesClusterConfig
for _, opt := range opts {
opt(&conf)
}
resource, err := p.getEKSClusterResource()
if err != nil {
return nil, err
}
kubeconfigPath, err := p.generateKubeconfigFile(resource.tfEKSClusterValues)
if err != nil {
return nil, err
}
return &KubernetesCluster{
KubeconfigPath: kubeconfigPath,
}, nil
}
func (p *TerraformProvider) getEKSClusterResource() (tfResource, error) {
resources, err := p.readEKSClusterResources(bytes.NewReader(p.tfShowJSONBytes))
if err != nil {
return tfResource{}, err
}
for _, resource := range resources {
if resource.tfEKSClusterValues != nil {
return resource, nil
}
}
return tfResource{}, fmt.Errorf("unable to find EKS cluster resource")
}
func (p *TerraformProvider) generateKubeconfigFile(values *tfEKSClusterValues) (string, error) {
kubeconfigPath := filepath.Join(p.KubeconfigDir, "tfeks_"+values.ID+".kubeconfig")
kubeconfig := &Kubeconfig{}
kubeconfig.APIVersion = "v1"
kubeconfig.Kind = "Config"
kubeconfigClusterUserContextName := "testkit_" + values.ID
var (
cluster KubeconfigCluster
context KubeconfigContext
user KubeconfigUser
)
cluster.Name = kubeconfigClusterUserContextName
cluster.Cluster.Server = values.Endpoint
cluster.Cluster.CertificateAuthorityData = values.CertificateAuthority[0].Data
context.Name = kubeconfigClusterUserContextName
context.Context.Cluster = kubeconfigClusterUserContextName
context.Context.User = kubeconfigClusterUserContextName
user.Name = kubeconfigClusterUserContextName
user.User.Exec.APIVersion = "client.authentication.k8s.io/v1beta1"
user.User.Exec.Command = "aws"
region := strings.Split(values.ARN, ":")[3]
user.User.Exec.Args = []string{
"--region",
region,
"eks",
"get-token",
"--cluster-name",
values.ID,
"--output",
"json",
}
kubeconfig.Clusters = []KubeconfigCluster{cluster}
kubeconfig.Contexts = []KubeconfigContext{context}
kubeconfig.Users = []KubeconfigUser{user}
kubeconfig.CurrentContext = kubeconfigClusterUserContextName
kubeconfigInYaml, err := yaml.Marshal(kubeconfig)
if err != nil {
return "", fmt.Errorf("unable to marshal kubeconfig: %v", err)
}
if err := os.MkdirAll(p.KubeconfigDir, 0755); err != nil {
return "", fmt.Errorf("unable to create kubeconfig directory %q: %v", p.KubeconfigDir, err)
}
// 0600 instead of 0644 for security, more concretely to avoid the following warnings:
// WARNING: Kubernetes configuration file is group-readable. This is insecure. Location: /path/to/the/kubeconfig/file
// WARNING: Kubernetes configuration file is world-readable. This is insecure. Location: /path/to/the/kubeconfig/file
if err := os.WriteFile(kubeconfigPath, kubeconfigInYaml, 0600); err != nil {
return "", fmt.Errorf("unable to write kubeconfig file: %v", err)
}
return kubeconfigPath, nil
}
type Kubeconfig struct {
APIVersion string `yaml:"apiVersion"`
Clusters []KubeconfigCluster `yaml:"clusters"`
Contexts []KubeconfigContext `yaml:"contexts"`
CurrentContext string `yaml:"current-context"`
Kind string `yaml:"kind"`
Preferences struct {
} `yaml:"preferences"`
Users []KubeconfigUser `yaml:"users"`
}
type KubeconfigCluster struct {
Cluster struct {
Server string `yaml:"server"`
CertificateAuthorityData string `yaml:"certificate-authority-data"`
} `yaml:"cluster"`
Name string `yaml:"name"`
}
type KubeconfigContext struct {
Context struct {
Cluster string `yaml:"cluster"`
User string `yaml:"user"`
} `yaml:"context"`
Name string `yaml:"name"`
}
type KubeconfigUser struct {
Name string `yaml:"name"`
User struct {
Exec struct {
APIVersion string `yaml:"apiVersion"`
Command string `yaml:"command"`
Args []string `yaml:"args"`
} `yaml:"exec"`
} `yaml:"user"`
}
func (p *TerraformProvider) GetS3Bucket(opts ...S3BucketOption) (*S3Bucket, error) {
resources, err := p.readS3BucketResources(bytes.NewReader(p.tfShowJSONBytes))
if err != nil {
return nil, err
}
for _, resource := range resources {
if resource.S3BucketValues == nil {
continue
}
return &S3Bucket{
Name: resource.S3BucketValues.Bucket,
Region: resource.S3BucketValues.Region,
}, nil
}
return nil, fmt.Errorf("unable to find S3 bucket")
}
func (p *TerraformProvider) GetECRImageRepository(opts ...ECRImageRepositoryOption) (*ECRImageRepository, error) {
resources, err := p.readECRImageRepository(bytes.NewReader(p.tfShowJSONBytes))
if err != nil {
return nil, err
}
for _, resource := range resources {
if resource.tfECRImageRepoValues == nil {
continue
}
return &ECRImageRepository{
ID: resource.tfECRImageRepoValues.ID,
ARN: resource.tfECRImageRepoValues.ARN,
RepositoryURL: resource.tfECRImageRepoValues.RepositoryURL,
RegistryID: resource.tfECRImageRepoValues.RegistryID,
}, nil
}
return nil, fmt.Errorf("unable to find ECR image repository")
}
type tfResource struct {
Address string `json:"address"`
// Mode can be e.g. "managed" or "data".
Mode string `json:"mode"`
// Type can be e.g.:
// - aws_s3_bucket
// - aws_iam_role
// - aws_vpc
// - aws_eks_cluster
Type string `json:"type"`
// Name is the name of the Terraform resource.
Name string `json:"name"`
// ProviderName is the name of the Terraform provider.
// E.g. "registry.terraform.io/hashicorp/aws".
ProviderName string `json:"provider_name"`
Values json.RawMessage `json:"values"`
S3BucketValues *tfS3BucketValues `json:"-"`
tfEKSClusterValues *tfEKSClusterValues `json:"-"`
tfECRImageRepoValues *tfECRImageRepositoryValues `json:"-"`
}
type tfS3BucketValues struct {
Bucket string `json:"bucket"`
// ID and Bucket have the same value.
ID string `json:"id"`
BucketDomainName string `json:"bucket_domain_name"`
BucketRegionalDomainName string `json:"bucket_regional_domain_name"`
Region string `json:"region"`
}
type tfEKSClusterValues struct {
// ID is the name of the EKS cluster.
ID string `json:"name"`
Endpoint string `json:"endpoint"`
ARN string `json:"arn"`
CertificateAuthority []tfEKSClusterCertificateAuthority `json:"certificate_authority"`
}
type tfECRImageRepositoryValues struct {
// ID is the name of the ECR image repository.
// In case the ARN is:
// arn:aws:ecr:${REGION}:${ACCOUNT_ID}:repository/testkit-imagerep
// the ID is:
// testkit-imagerep
ID string `json:"id"`
// ARN is the Amazon Resource Name of the ECR image repository.
// In case the name of the repository is "testkit-imagerep",
// the ARN is:
// arn:aws:ecr:${REGION}:${ACCOUNT_ID}:repository/testkit-imagerep
ARN string `json:"arn"`
// RepositoryURL is the URL of the ECR image repository.
// In case the name of the repository is "testkit-imagerep",
// the URL is:
// ${ACCOUNT_ID}.dkr.ecr.${REGION}.amazonaws.com/testkit-imagerep
RepositoryURL string `json:"repository_url"`
// RegistryID is the ID of the registry.
// It's the same as the account ID.
RegistryID string `json:"registry_id"`
}
type tfEKSClusterCertificateAuthority struct {
Data string `json:"data"`
}
type tfShowOutput struct {
Values tfShowValues `json:"values"`
}
type tfShowValues struct {
RootModule tfShowRootModule `json:"root_module"`
}
type tfShowRootModule struct {
Resources []tfResource `json:"resources"`
}
func (p *TerraformProvider) captureTerraformShowJSON() ([]byte, error) {
output, err := p.runTerraformCommand("show", "-json")
if err != nil {
return nil, err
}
return output, nil
}
func (p *TerraformProvider) runTerraformCommand(args ...string) ([]byte, error) {
var argsWithVars []string
argsWithVars = append(argsWithVars, args...)
for k, v := range p.Vars {
argsWithVars = append(argsWithVars, "-var", k+"="+v)
}
return p.runTerraformCommandNoVars(argsWithVars...)
}
func (p *TerraformProvider) runTerraformCommandNoVars(args ...string) ([]byte, error) {
c := exec.Command("terraform", args...)
c.Dir = p.WorkspacePath
r, err := c.CombinedOutput()
if err != nil {
return nil, fmt.Errorf("unable to run terraform command: %v\n%s", err, string(r))
}
return r, nil
}
func (p *TerraformProvider) readEKSClusterResources(r io.Reader) ([]tfResource, error) {
rs, err := p.readResourcesOfType(r, "aws_eks_cluster")
if err != nil {
return nil, err
}
var filteredResources []tfResource
for _, r := range rs {
var values tfEKSClusterValues
if err := json.Unmarshal(r.Values, &values); err != nil {
return nil, err
}
r.tfEKSClusterValues = &values
filteredResources = append(filteredResources, r)
}
return filteredResources, nil
}
func (p *TerraformProvider) readS3BucketResources(r io.Reader) ([]tfResource, error) {
rs, err := p.readResourcesOfType(r, "aws_s3_bucket")
if err != nil {
return nil, fmt.Errorf("unable to read S3 bucket resources: %v", err)
}
var filteredResources []tfResource
for _, r := range rs {
var values tfS3BucketValues
if err := json.Unmarshal(r.Values, &values); err != nil {
return nil, fmt.Errorf("unable to unmarshal tfS3BucketValues: %v", err)
}
r.S3BucketValues = &values
filteredResources = append(filteredResources, r)
}
return filteredResources, nil
}
func (p *TerraformProvider) readECRImageRepository(r io.Reader) ([]tfResource, error) {
rs, err := p.readResourcesOfType(r, "aws_ecr_repository")
if err != nil {
return nil, err
}
var filteredResources []tfResource
for _, r := range rs {
var values tfECRImageRepositoryValues
if err := json.Unmarshal(r.Values, &values); err != nil {
return nil, err
}
r.tfECRImageRepoValues = &values
filteredResources = append(filteredResources, r)
}
return filteredResources, nil
}
func (p *TerraformProvider) readResourcesOfType(r io.Reader, resourceType string) ([]tfResource, error) {
resources, err := p.readResources(r)
if err != nil {
return nil, err
}
var filteredResources []tfResource
for _, resource := range resources {
if resource.Type == resourceType {
filteredResources = append(filteredResources, resource)
}
}
return filteredResources, nil
}
func (p *TerraformProvider) readResources(r io.Reader) ([]tfResource, error) {
var output tfShowOutput
if err := json.NewDecoder(r).Decode(&output); err != nil {
return nil, err
}
return output.Values.RootModule.Resources, nil
}
func (p *TerraformProvider) Setup() error {
if p.KubeconfigDir == "" {
p.KubeconfigDir = filepath.Join(os.TempDir(), "testkit_terraform_kubeconfigs")
}
if p.WorkspacePath == "" {
return fmt.Errorf("workspacePath is not set")
}
_, err := os.Stat(p.WorkspacePath)
if err != nil {
return fmt.Errorf("unable to stat workspace path: %v", err)
}
if p.Vars == nil {
p.Vars = make(map[string]string)
}
_, err = p.runTerraformCommand("init")
if err != nil {
return fmt.Errorf("unable to run terraform init: %v", err)
}
_, err = p.runTerraformCommand("apply", "-auto-approve")
if err != nil {
return fmt.Errorf("unable to run terraform apply: %v", err)
}
output, err := p.runTerraformCommandNoVars("show", "-json")
if err != nil {
return fmt.Errorf("unable to run terraform show: %v", err)
}
p.tfShowJSONBytes = output
return nil
}
func (p *TerraformProvider) Cleanup() error {
_, err := p.runTerraformCommand("destroy", "-auto-approve")
if err != nil {
return err
}
return nil
}