helm.go

package helm

import (
	"fmt"
	"io"
	"os"
	"strings"

	"github.com/f-rambo/ocean/utils"
	"github.com/go-kratos/kratos/v2/log"
	"github.com/pkg/errors"
	"gopkg.in/yaml.v2"
	"helm.sh/helm/v3/pkg/action"
	"helm.sh/helm/v3/pkg/chart"
	"helm.sh/helm/v3/pkg/cli"
	"helm.sh/helm/v3/pkg/kube"
	kubefake "helm.sh/helm/v3/pkg/kube/fake"
	"helm.sh/helm/v3/pkg/registry"
	"helm.sh/helm/v3/pkg/release"
	"helm.sh/helm/v3/pkg/storage/driver"
)

var settings = cli.New()

type HelmPkg struct {
	actionConfig *action.Configuration
	logs         []string
	log          *log.Helper
}

func (d *HelmPkg) Logf(format string, v ...interface{}) {
	d.log.Debugf(format, v...)
	log := fmt.Sprintf(format, v...)
	if !utils.Contains(d.logs, log) {
		d.logs = append(d.logs, log)
	}
}

func NewHelmPkg(log *log.Helper, namespace string) (*HelmPkg, error) {
	settings.Debug = true
	if namespace == "" {
		namespace = "default"
	}
	helmPkg := &HelmPkg{log: log, logs: make([]string, 0)}
	settings.SetNamespace(namespace)
	kube.ManagedFieldsManager = "helm"
	actionConfig := new(action.Configuration)
	helmDriver := os.Getenv("HELM_DRIVER")
	if err := actionConfig.Init(settings.RESTClientGetter(), settings.Namespace(), helmDriver, helmPkg.Logf); err != nil {
		return nil, err
	}
	if helmDriver == "memory" {
		loadReleasesInMemory(actionConfig)
	}
	registryClient, err := newDefaultRegistryClient(false)
	if err != nil {
		return nil, err
	}
	actionConfig.RegistryClient = registryClient
	helmPkg.actionConfig = actionConfig
	return helmPkg, nil
}

func (h *HelmPkg) GetLogs() string {
	return strings.Join(h.logs, "\n")
}

func newDefaultRegistryClient(plainHTTP bool) (*registry.Client, error) {
	opts := []registry.ClientOption{
		registry.ClientOptDebug(settings.Debug),
		registry.ClientOptEnableCache(true),
		registry.ClientOptWriter(os.Stderr),
		registry.ClientOptCredentialsFile(settings.RegistryConfig),
	}
	if plainHTTP {
		opts = append(opts, registry.ClientOptPlainHTTP())
	}

	// Create a new registry client
	registryClient, err := registry.NewClient(opts...)
	if err != nil {
		return nil, err
	}
	return registryClient, nil
}

func newRegistryClient(certFile, keyFile, caFile string, insecureSkipTLSverify, plainHTTP bool) (*registry.Client, error) {
	if certFile != "" && keyFile != "" || caFile != "" || insecureSkipTLSverify {
		registryClient, err := newRegistryClientWithTLS(certFile, keyFile, caFile, insecureSkipTLSverify)
		if err != nil {
			return nil, err
		}
		return registryClient, nil
	}
	registryClient, err := newDefaultRegistryClient(plainHTTP)
	if err != nil {
		return nil, err
	}
	return registryClient, nil
}

func newRegistryClientWithTLS(certFile, keyFile, caFile string, insecureSkipTLSverify bool) (*registry.Client, error) {
	// Create a new registry client
	registryClient, err := registry.NewRegistryClientWithTLS(os.Stderr, certFile, keyFile, caFile, insecureSkipTLSverify,
		settings.RegistryConfig, settings.Debug,
	)
	if err != nil {
		return nil, err
	}
	return registryClient, nil
}

// This function loads releases into the memory storage if the
// environment variable is properly set.
func loadReleasesInMemory(actionConfig *action.Configuration) {
	filePaths := strings.Split(os.Getenv("HELM_MEMORY_DRIVER_DATA"), ":")
	if len(filePaths) == 0 {
		return
	}

	store := actionConfig.Releases
	mem, ok := store.Driver.(*driver.Memory)
	if !ok {
		// For an unexpected reason we are not dealing with the memory storage driver.
		return
	}

	actionConfig.KubeClient = &kubefake.PrintingKubeClient{Out: io.Discard}

	for _, path := range filePaths {
		b, err := os.ReadFile(path)
		if err != nil {
			log.Fatal("Unable to read memory driver data", err)
		}

		releases := []*release.Release{}
		if err := yaml.Unmarshal(b, &releases); err != nil {
			log.Fatal("Unable to unmarshal memory driver data: ", err)
		}

		for _, rel := range releases {
			if err := store.Create(rel); err != nil {
				log.Fatal(err)
			}
		}
	}
	// Must reset namespace to the proper one
	mem.SetNamespace(settings.Namespace())
}

func (h *HelmPkg) Write(p []byte) (n int, err error) {
	h.Logf(string(p))
	return len(p), nil
}

func validateDryRunOptionFlag(dryRunOptionFlagValue string) error {
	// Validate dry-run flag value with a set of allowed value
	allowedDryRunValues := []string{"false", "true", "none", "client", "server"}
	isAllowed := false
	for _, v := range allowedDryRunValues {
		if dryRunOptionFlagValue == v {
			isAllowed = true
			break
		}
	}
	if !isAllowed {
		return errors.New("Invalid dry-run flag. Flag must one of the following: false, true, none, client, server")
	}
	return nil
}

// Application chart type is only installable
func checkIfInstallable(ch *chart.Chart) error {
	switch ch.Metadata.Type {
	case "", "application":
		return nil
	}
	return errors.Errorf("%s charts are not installable", ch.Metadata.Type)
}