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fs_index.go
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/
fs_index.go
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package index
import (
"fmt"
"path/filepath"
"sort"
"strings"
"sync"
bosherr "github.com/cloudfoundry/bosh-utils/errors"
boshsys "github.com/cloudfoundry/bosh-utils/system"
"gopkg.in/yaml.v2"
)
type FSIndex struct {
name string
dirPath string
reporter Reporter
blobs IndexBlobs
fs boshsys.FileSystem
useSubdir bool
expectsBlobstoreIDs bool
mutex *sync.Mutex
}
type indexEntry struct {
Key string
Version string
BlobstoreID string
SHA1 string
}
/*
---
builds:
70b9ea8efb83b882021792517b1164550b41bc27:
version: 70b9ea8efb83b882021792517b1164550b41bc27
sha1: b514a8cc194278d5c5b96d552cdbe0cade1ed719
format-version: '2'
---
builds:
88a17b61a5b892c9c59884ea5dee04ba6e116bb2:
version: 88a17b61a5b892c9c59884ea5dee04ba6e116bb2
sha1: 98eca647ddf3b24ae62fce44ea8a8e3526c3e53c
blobstore_id: cd26953d-b811-4127-b512-6f48639bd069
format-version: '2'
*/
type duplicateError struct {
msg string
args []interface{}
}
func (de duplicateError) Error() string {
return fmt.Sprintf(de.msg, de.args...)
}
func (de duplicateError) IsDuplicate() bool {
return true
}
type fsIndexSchema struct {
Builds fsIndexSchema_SortedEntries `yaml:"builds"`
FormatVersion string `yaml:"format-version"`
}
type fsIndexSchema_SortedEntries map[string]fsIndexSchema_Entry
var _ yaml.Marshaler = fsIndexSchema_SortedEntries{}
func (e fsIndexSchema_SortedEntries) MarshalYAML() (interface{}, error) {
var keys []string
for k, _ := range e {
keys = append(keys, k)
}
sort.Sort(sort.StringSlice(keys))
var sortedEntries []yaml.MapItem
for _, k := range keys {
sortedEntries = append(sortedEntries, yaml.MapItem{Key: k, Value: e[k]})
}
return sortedEntries, nil
}
type fsIndexSchema_Entry struct {
Version string `yaml:"version"`
BlobstoreID string `yaml:"blobstore_id,omitempty"`
SHA1 string `yaml:"sha1"`
}
func NewFSIndex(
name string,
dirPath string,
useSubdir bool,
expectsBlobstoreIDs bool,
reporter Reporter,
blobs IndexBlobs,
fs boshsys.FileSystem,
) FSIndex {
return FSIndex{
name: name,
dirPath: dirPath,
reporter: reporter,
blobs: blobs,
fs: fs,
useSubdir: useSubdir,
expectsBlobstoreIDs: expectsBlobstoreIDs,
mutex: &sync.Mutex{},
}
}
func (i FSIndex) Find(name, fingerprint string) (string, string, error) {
if len(name) == 0 {
return "", "", bosherr.Error("Expected non-empty name")
}
if len(fingerprint) == 0 {
return "", "", bosherr.Error("Expected non-empty fingerprint")
}
entries, err := i.entries(name)
if err != nil {
return "", "", err
}
for _, entry := range entries {
if entry.Version == fingerprint {
blobName := fmt.Sprintf("%s/%s", name, entry.Version)
blobPath, err := i.blobs.Get(blobName, entry.BlobstoreID, entry.SHA1)
if err != nil {
return "", "", err
}
return blobPath, entry.SHA1, nil
}
}
return "", "", nil
}
func (i FSIndex) Add(name, fingerprint, path, sha1 string) (string, string, error) {
if len(name) == 0 {
return "", "", bosherr.Error("Expected non-empty name")
}
if len(fingerprint) == 0 {
return "", "", bosherr.Error("Expected non-empty fingerprint")
}
if len(path) == 0 {
return "", "", bosherr.Error("Expected non-empty archive path")
}
if len(sha1) == 0 {
return "", "", bosherr.Error("Expected non-empty archive SHA1")
}
entries, err := i.entries(name)
if err != nil {
return "", "", err
}
for _, entry := range entries {
if entry.Version == fingerprint {
return "", "", duplicateError{
msg: "Trying to add duplicate index entry '%s/%s' and SHA1 '%s' (conflicts with '%#v')",
args: []interface{}{name, fingerprint, sha1, entry},
}
}
}
entry := indexEntry{
Key: fingerprint,
Version: fingerprint,
SHA1: sha1,
}
desc := fmt.Sprintf("%s/%s", name, fingerprint)
i.reporter.IndexEntryStartedAdding(i.name, desc)
blobID, blobPath, err := i.blobs.Add(desc, path, sha1)
if err != nil {
i.reporter.IndexEntryFinishedAdding(i.name, desc, err)
return "", "", err
}
entry.BlobstoreID = blobID
entries = append(entries, entry)
err = i.save(name, entries)
if err != nil {
i.reporter.IndexEntryFinishedAdding(i.name, desc, err)
return "", "", err
}
i.reporter.IndexEntryFinishedAdding(i.name, desc, nil)
return blobPath, sha1, nil
}
var (
// Ruby CLI for some reason produces invalid annotations
invalidBinaryAnnotationReplacer = strings.NewReplacer(" !binary ", " !!binary ")
)
func (i FSIndex) entries(name string) ([]indexEntry, error) {
indexPath := i.indexPath(name)
if !i.fs.FileExists(indexPath) {
return nil, nil
}
bytes, err := i.fs.ReadFile(indexPath)
if err != nil {
return nil, bosherr.WrapErrorf(err, "Reading index")
}
var schema fsIndexSchema
str := invalidBinaryAnnotationReplacer.Replace(string(bytes))
err = yaml.Unmarshal([]byte(str), &schema)
if err != nil {
return nil, bosherr.WrapError(err, "Unmarshalling index")
}
var entries []indexEntry
for versionKey, entry := range schema.Builds {
entries = append(entries, indexEntry{
Key: versionKey,
Version: entry.Version,
BlobstoreID: entry.BlobstoreID,
SHA1: entry.SHA1,
})
}
return entries, nil
}
func (i FSIndex) save(name string, entries []indexEntry) error {
schema := fsIndexSchema{
Builds: fsIndexSchema_SortedEntries{},
FormatVersion: "2",
}
for _, entry := range entries {
if i.expectsBlobstoreIDs && len(entry.BlobstoreID) == 0 {
return bosherr.Errorf("Internal inconsistency: entry must include blob ID '%#v'", entry)
} else if !i.expectsBlobstoreIDs && len(entry.BlobstoreID) > 0 {
return bosherr.Errorf("Internal inconsistency: entry must not include blob ID '%#v'", entry)
}
schema.Builds[entry.Key] = fsIndexSchema_Entry{
Version: entry.Version,
BlobstoreID: entry.BlobstoreID,
SHA1: entry.SHA1,
}
}
bytes, err := yaml.Marshal(schema)
if err != nil {
return bosherr.WrapError(err, "Marshalling index")
}
indexPath := i.indexPath(name)
i.mutex.Lock()
defer i.mutex.Unlock()
err = i.fs.WriteFile(indexPath, bytes)
if err != nil {
return bosherr.WrapErrorf(err, "Writing index")
}
return nil
}
func (i FSIndex) indexPath(name string) string {
if i.useSubdir {
return filepath.Join(i.dirPath, name, "index.yml")
}
return filepath.Join(i.dirPath, "index.yml")
}