graphql-engine/cli/plugins/plugins.go
2020-04-22 14:45:42 +05:30

310 lines
10 KiB
Go

package plugins
/*
some of the code here is borrowed from the krew codebse (kubernetes)
and the copyright belongs to the respective authors.
source: https://github.com/kubernetes-sigs/krew/tree/master/internal
*/
import (
"fmt"
"io/ioutil"
"os"
"path/filepath"
"runtime"
"github.com/Masterminds/semver"
"github.com/ghodss/yaml"
"github.com/hasura/graphql-engine/cli/plugins/paths"
"github.com/hasura/graphql-engine/cli/util"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
)
var (
ErrIsAlreadyInstalled = errors.New("can't install, plugin is already installed")
ErrIsNotInstalled = errors.New("plugin is not installed")
ErrIsAlreadyUpgraded = errors.New("can't upgrade, the newest version is already installed")
ErrVersionNotAvailable = errors.New("plugin version is not available")
)
// IndexBranchRef - branch to be used for index
var IndexBranchRef = "master"
const (
indexURI string = "https://github.com/hasura/cli-plugins-index.git"
)
// Config defines the required
type Config struct {
// Paths contains all important environment paths
Paths paths.Paths
// Repo defines the git object required to maintain the plugin index
Repo *util.GitUtil
Logger *logrus.Logger
}
// FetchOpts - options available during fetching plugin manifest
type FetchOpts struct {
ManifestFile string
Version *semver.Version
}
func New(base string) *Config {
p := paths.NewPaths(base)
return &Config{
Paths: p,
Repo: util.NewGitUtil(indexURI, p.IndexPath(), IndexBranchRef),
}
}
// Prepare makes sure that the plugins directory is initialized
func (c *Config) Prepare() error {
return errors.Wrap(ensureDirs(c.Paths.BasePath(),
c.Paths.DownloadPath(),
c.Paths.InstallPath(),
c.Paths.BinPath(),
c.Paths.InstallReceiptsPath(),
), "unable to create plugin directories")
}
// ListInstalledPlugins returns a list of all install plugins in a
// name:version format based on the install receipts at the specified dir.
func (c *Config) ListInstalledPlugins() (map[string]string, error) {
receiptsDir := c.Paths.InstallReceiptsPath()
matches, err := filepath.Glob(filepath.Join(receiptsDir, "*"+paths.ManifestExtension))
if err != nil {
return nil, errors.Wrapf(err, "failed to grab receipts directory (%s) for manifests", receiptsDir)
}
installed := make(map[string]string)
for _, m := range matches {
r, err := c.LoadManifest(m)
if err != nil {
return nil, errors.Wrapf(err, "failed to parse plugin install receipt %s", m)
}
installed[r.Name] = r.Version
}
return installed, nil
}
func (c *Config) ListPlugins() (Plugins, error) {
return c.LoadPluginListFromFS(c.Paths.IndexPluginsPath())
}
func (c *Config) GetPlugin(pluginName string, opts FetchOpts) (Plugin, error) {
var plugin Plugin
var err error
if opts.ManifestFile == "" {
// Load the plugin index by name
ps, err := c.LoadPluginByName(pluginName)
if err != nil {
if os.IsNotExist(err) {
return plugin, errors.Errorf("plugin %q does not exist in the plugin index", pluginName)
}
return plugin, errors.Wrapf(err, "failed to load plugin %q from the index", pluginName)
}
// Load the installed manifest
pluginReceipt, err := c.LoadManifest(c.Paths.PluginInstallReceiptPath(pluginName))
if err != nil && !os.IsNotExist(err) {
return plugin, errors.Wrap(err, "failed to look up plugin receipt")
}
if opts.Version != nil {
if pluginReceipt.Version == opts.Version.Original() {
return plugin, ErrIsAlreadyInstalled
}
// check if version is available
ver := ps.Index.Search(opts.Version)
if ver != nil {
plugin = ps.Versions[ver]
} else {
return plugin, ErrVersionNotAvailable
}
} else {
if err == nil {
return plugin, ErrIsAlreadyInstalled
}
// get the latest version
latestVersion := ps.Index[len(ps.Index)-1]
plugin = ps.Versions[latestVersion]
}
} else {
plugin, err = c.ReadPluginFromFile(opts.ManifestFile)
if err != nil {
return plugin, errors.Wrap(err, "failed to load plugin manifest from file")
}
if plugin.Name != pluginName {
return plugin, fmt.Errorf("plugin name %s doesn't match with plugin in the manifest file %s", pluginName, opts.ManifestFile)
}
}
return plugin, nil
}
func (c *Config) Install(plugin Plugin) error {
// Find available installation platform
platform, ok, err := MatchPlatform(plugin.Platforms)
if err != nil {
return errors.Wrap(err, "failed trying to find a matching platform in plugin spec")
}
if !ok {
return errors.Errorf("plugin %q does not offer installation for this platform", plugin.Name)
}
if err := c.installPlugin(plugin, platform); err != nil {
return errors.Wrap(err, "install failed")
}
err = c.StoreManifest(plugin, c.Paths.PluginInstallReceiptPath(plugin.Name))
return errors.Wrap(err, "installation receipt could not be stored, uninstall may fail")
}
// Uninstall will uninstall a plugin.
func (c *Config) Uninstall(name string) error {
if _, err := c.LoadManifest(c.Paths.PluginInstallReceiptPath(name)); err != nil {
if os.IsNotExist(err) {
return ErrIsNotInstalled
}
return errors.Wrapf(err, "failed to look up install receipt for plugin %q", name)
}
symlinkPath := filepath.Join(c.Paths.BinPath(), PluginNameToBin(name, IsWindows()))
if err := removeLink(symlinkPath); err != nil {
return errors.Wrap(err, "could not uninstall symlink of plugin")
}
pluginInstallPath := c.Paths.PluginInstallPath(name)
if err := os.RemoveAll(pluginInstallPath); err != nil {
return errors.Wrapf(err, "could not remove plugin directory %q", pluginInstallPath)
}
pluginReceiptPath := c.Paths.PluginInstallReceiptPath(name)
err := os.Remove(pluginReceiptPath)
return errors.Wrapf(err, "could not remove plugin receipt %q", pluginReceiptPath)
}
func (c *Config) installPlugin(plugin Plugin, platform Platform) error {
downloadStagingDir := filepath.Join(c.Paths.DownloadPath(), plugin.Name)
installDir := c.Paths.PluginVersionInstallPath(plugin.Name, plugin.Version)
binDir := c.Paths.BinPath()
// check if install dir already exists
_, err := os.Stat(installDir)
if err != nil {
// Download and extract
if err := os.MkdirAll(downloadStagingDir, 0755); err != nil {
return errors.Wrapf(err, "could not create staging dir %q", downloadStagingDir)
}
defer func() {
c.Logger.Debugf("Deleting the download staging directory %s", downloadStagingDir)
if err := os.RemoveAll(downloadStagingDir); err != nil {
c.Logger.Debugf("failed to clean up download staging directory: %s", err)
}
}()
if err := downloadAndExtract(downloadStagingDir, platform.URI, platform.Sha256); err != nil {
return errors.Wrap(err, "failed to unpack into staging dir")
}
if err := moveToInstallDir(downloadStagingDir, installDir, platform.Files); err != nil {
return errors.Wrap(err, "failed while moving files to the installation directory")
}
}
subPathAbs, err := filepath.Abs(installDir)
if err != nil {
return errors.Wrapf(err, "failed to get the absolute fullPath of %q", installDir)
}
fullPath := filepath.Join(installDir, filepath.FromSlash(platform.Bin))
pathAbs, err := filepath.Abs(fullPath)
if err != nil {
return errors.Wrapf(err, "failed to get the absolute fullPath of %q", fullPath)
}
if _, ok := IsSubPath(subPathAbs, pathAbs); !ok {
return errors.Wrapf(err, "the fullPath %q does not extend the sub-fullPath %q", fullPath, installDir)
}
err = createOrUpdateLink(binDir, fullPath, plugin.Name)
return errors.Wrap(err, "failed to link installed plugin")
}
// Upgrade will reinstall and delete the old plugin. The operation tries
// to not get the plugin dir in a bad state if it fails during the process.
func (c *Config) Upgrade(pluginName string, version *semver.Version) (Plugin, error) {
ps, err := c.LoadPluginByName(pluginName)
if err != nil {
if os.IsNotExist(err) {
return Plugin{}, errors.Errorf("plugin %q does not exist in the plugin index", pluginName)
}
return Plugin{}, errors.Wrapf(err, "failed to load the plugin manifest for plugin %s", pluginName)
}
// get the latest version
var plugin Plugin
if version != nil {
ver := ps.Index.Search(version)
if ver != nil {
plugin = ps.Versions[ver]
} else {
return Plugin{}, ErrVersionNotAvailable
}
} else {
latestVersion := ps.Index[len(ps.Index)-1]
plugin = ps.Versions[latestVersion]
}
installReceipt, err := c.LoadManifest(c.Paths.PluginInstallReceiptPath(plugin.Name))
if err != nil {
return plugin, errors.Wrapf(err, "failed to load install receipt for plugin %q", plugin.Name)
}
if installReceipt.ParsedVersion == nil {
c.Logger.Debugf("failed to parse installed plugin version (%q) as a semver value", installReceipt.ParsedVersion)
c.Logger.Debugf("assuming installed plugin %s as a dev version and force upgrade", plugin.Name)
}
// Find available installation platform
platform, ok, err := MatchPlatform(plugin.Platforms)
if err != nil {
return plugin, errors.Wrap(err, "failed trying to find a matching platform in plugin spec")
}
if !ok {
return plugin, errors.Errorf("plugin %q does not offer installation for this platform (%s)",
plugin.Name, fmt.Sprintf("%s-%s", runtime.GOOS, runtime.GOARCH))
}
// See if it's a newer version
if installReceipt.ParsedVersion != nil {
if !installReceipt.ParsedVersion.LessThan(plugin.ParsedVersion) || installReceipt.ParsedVersion.Equal(plugin.ParsedVersion) {
fmt.Println("asdasd")
return plugin, ErrIsAlreadyUpgraded
}
}
if err = c.StoreManifest(plugin, c.Paths.PluginInstallReceiptPath(plugin.Name)); err != nil {
return plugin, errors.Wrap(err, "installation receipt could not be stored, uninstall may fail")
}
// Re-Install
if err := c.installPlugin(plugin, platform); err != nil {
return plugin, errors.Wrap(err, "failed to install new version")
}
// Clean old installations
return plugin, os.RemoveAll(c.Paths.PluginVersionInstallPath(plugin.Name, installReceipt.Version))
}
func (c *Config) LoadManifest(path string) (Plugin, error) {
return c.ReadPluginFromFile(path)
}
func (c *Config) StoreManifest(plugin Plugin, dest string) error {
yamlBytes, err := yaml.Marshal(plugin)
if err != nil {
return errors.Wrapf(err, "convert to yaml")
}
err = ioutil.WriteFile(dest, yamlBytes, 0644)
return errors.Wrapf(err, "write plugin receipt %q", dest)
}