terraform/config/module/storage.go

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package module
import (
"encoding/json"
"fmt"
"io/ioutil"
"log"
"os"
"path/filepath"
getter "github.com/hashicorp/go-getter"
"github.com/hashicorp/terraform/registry/regsrc"
"github.com/hashicorp/terraform/svchost/auth"
"github.com/hashicorp/terraform/svchost/disco"
"github.com/mitchellh/cli"
)
const manifestName = "modules.json"
// moduleManifest is the serialization structure used to record the stored
// module's metadata.
type moduleManifest struct {
Modules []moduleRecord
}
// moduleRecords represents the stored module's metadata.
// This is compared for equality using '==', so all fields needs to remain
// comparable.
type moduleRecord struct {
// Source is the module source string from the config, minus any
// subdirectory.
Source string
// Key is the locally unique identifier for this module.
Key string
// Version is the exact version string for the stored module.
Version string
// Dir is the directory name returned by the FileStorage. This is what
// allows us to correlate a particular module version with the location on
// disk.
Dir string
// Root is the root directory containing the module. If the module is
// unpacked from an archive, and not located in the root directory, this is
// used to direct the loader to the correct subdirectory. This is
// independent from any subdirectory in the original source string, which
// may traverse further into the module tree.
Root string
// url is the location of the module source
url string
// Registry is true if this module is sourced from a registry
registry bool
}
// Storage implements methods to manage the storage of modules.
// This is used by Tree.Load to query registries, authenticate requests, and
// store modules locally.
type Storage struct {
// StorageDir is the full path to the directory where all modules will be
// stored.
StorageDir string
// Services is a required *disco.Disco, which may have services and
// credentials pre-loaded.
Services *disco.Disco
// Creds optionally provides credentials for communicating with service
// providers.
Creds auth.CredentialsSource
// Ui is an optional cli.Ui for user output
Ui cli.Ui
// Mode is the GetMode that will be used for various operations.
Mode GetMode
}
func NewStorage(dir string, services *disco.Disco, creds auth.CredentialsSource) *Storage {
s := &Storage{
StorageDir: dir,
Services: services,
Creds: creds,
}
// make sure this isn't nil
if s.Services == nil {
s.Services = disco.NewDisco()
}
return s
}
// loadManifest returns the moduleManifest file from the parent directory.
func (s Storage) loadManifest() (moduleManifest, error) {
manifest := moduleManifest{}
manifestPath := filepath.Join(s.StorageDir, manifestName)
data, err := ioutil.ReadFile(manifestPath)
if err != nil && !os.IsNotExist(err) {
return manifest, err
}
if len(data) == 0 {
return manifest, nil
}
if err := json.Unmarshal(data, &manifest); err != nil {
return manifest, err
}
return manifest, nil
}
// Store the location of the module, along with the version used and the module
// root directory. The storage method loads the entire file and rewrites it
// each time. This is only done a few times during init, so efficiency is
// not a concern.
func (s Storage) recordModule(rec moduleRecord) error {
manifest, err := s.loadManifest()
if err != nil {
// if there was a problem with the file, we will attempt to write a new
// one. Any non-data related error should surface there.
log.Printf("[WARN] error reading module manifest: %s", err)
}
// do nothing if we already have the exact module
for i, stored := range manifest.Modules {
if rec == stored {
return nil
}
// they are not equal, but if the storage path is the same we need to
// remove this rec to be replaced.
if rec.Dir == stored.Dir {
manifest.Modules[i] = manifest.Modules[len(manifest.Modules)-1]
manifest.Modules = manifest.Modules[:len(manifest.Modules)-1]
break
}
}
manifest.Modules = append(manifest.Modules, rec)
js, err := json.Marshal(manifest)
if err != nil {
panic(err)
}
manifestPath := filepath.Join(s.StorageDir, manifestName)
return ioutil.WriteFile(manifestPath, js, 0644)
}
// load the manifest from dir, and return all module versions matching the
// provided source. Records with no version info will be skipped, as they need
// to be uniquely identified by other means.
func (s Storage) moduleVersions(source string) ([]moduleRecord, error) {
manifest, err := s.loadManifest()
if err != nil {
return manifest.Modules, err
}
var matching []moduleRecord
for _, m := range manifest.Modules {
if m.Source == source && m.Version != "" {
log.Printf("[DEBUG] found local version %q for module %s", m.Version, m.Source)
matching = append(matching, m)
}
}
return matching, nil
}
func (s Storage) moduleDir(key string) (string, error) {
manifest, err := s.loadManifest()
if err != nil {
return "", err
}
for _, m := range manifest.Modules {
if m.Key == key {
return m.Dir, nil
}
}
return "", nil
}
// return only the root directory of the module stored in dir.
func (s Storage) getModuleRoot(dir string) (string, error) {
manifest, err := s.loadManifest()
if err != nil {
return "", err
}
for _, mod := range manifest.Modules {
if mod.Dir == dir {
return mod.Root, nil
}
}
return "", nil
}
// record only the Root directory for the module stored at dir.
func (s Storage) recordModuleRoot(dir, root string) error {
rec := moduleRecord{
Dir: dir,
Root: root,
}
return s.recordModule(rec)
}
func (s Storage) output(msg string) {
if s.Ui == nil || s.Mode == GetModeNone {
return
}
s.Ui.Output(msg)
}
func (s Storage) getStorage(key string, src string) (string, bool, error) {
storage := &getter.FolderStorage{
StorageDir: s.StorageDir,
}
log.Printf("[DEBUG] fetching module from %s", src)
// Get the module with the level specified if we were told to.
if s.Mode > GetModeNone {
log.Printf("[DEBUG] fetching %q with key %q", src, key)
if err := storage.Get(key, src, s.Mode == GetModeUpdate); err != nil {
return "", false, err
}
}
// Get the directory where the module is.
dir, found, err := storage.Dir(key)
log.Printf("[DEBUG] found %q in %q: %t", src, dir, found)
return dir, found, err
}
// find a stored module that's not from a registry
func (s Storage) findModule(key string) (string, error) {
if s.Mode == GetModeUpdate {
return "", nil
}
return s.moduleDir(key)
}
// GetModule fetches a module source into the specified directory. This is used
// as a convenience function by the CLI to initialize a configuration.
func (s Storage) GetModule(dst, src string) error {
// reset this in case the caller was going to re-use it
mode := s.Mode
s.Mode = GetModeUpdate
defer func() {
s.Mode = mode
}()
rec, err := s.findRegistryModule(src, anyVersion)
if err != nil {
return err
}
pwd, err := os.Getwd()
if err != nil {
return err
}
source := rec.url
if source == "" {
source, err = getter.Detect(src, pwd, getter.Detectors)
if err != nil {
return fmt.Errorf("module %s: %s", src, err)
}
}
if source == "" {
return fmt.Errorf("module %q not found", src)
}
return GetCopy(dst, source)
}
// find a registry module
func (s Storage) findRegistryModule(mSource, constraint string) (moduleRecord, error) {
rec := moduleRecord{
Source: mSource,
}
// detect if we have a registry source
mod, err := regsrc.ParseModuleSource(mSource)
switch err {
case nil:
//ok
case regsrc.ErrInvalidModuleSource:
return rec, nil
default:
return rec, err
}
rec.registry = true
log.Printf("[TRACE] %q is a registry module", mod.Module())
versions, err := s.moduleVersions(mod.String())
if err != nil {
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log.Printf("[ERROR] error looking up versions for %q: %s", mod.Module(), err)
return rec, err
}
match, err := newestRecord(versions, constraint)
if err != nil {
log.Printf("[INFO] no matching version for %q<%s>, %s", mod.Module(), constraint, err)
}
log.Printf("[DEBUG] matched %q version %s for %s", mod, match.Version, constraint)
rec.Dir = match.Dir
rec.Version = match.Version
found := rec.Dir != ""
// we need to lookup available versions
// Only on Get if it's not found, on unconditionally on Update
if (s.Mode == GetModeGet && !found) || (s.Mode == GetModeUpdate) {
resp, err := s.lookupModuleVersions(mod)
if err != nil {
return rec, err
}
if len(resp.Modules) == 0 {
return rec, fmt.Errorf("module %q not found in registry", mod.Module())
}
match, err := newestVersion(resp.Modules[0].Versions, constraint)
if err != nil {
return rec, err
}
if match == nil {
return rec, fmt.Errorf("no versions for %q found matching %q", mod.Module(), constraint)
}
rec.Version = match.Version
rec.url, err = s.lookupModuleLocation(mod, rec.Version)
if err != nil {
return rec, err
}
s.output(fmt.Sprintf(" Found version %s of %s on %s", rec.Version, mod.Module(), mod.RawHost.Display()))
}
return rec, nil
}