/
fs.go
186 lines (167 loc) · 5.87 KB
/
fs.go
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package main
import (
"log"
"strconv"
"strings"
"github.com/hanwen/go-fuse/fuse"
"github.com/hanwen/go-fuse/fuse/nodefs"
"github.com/hanwen/go-fuse/fuse/pathfs"
)
type ElasticsearchFS struct {
pathfs.FileSystem
cache *ElasticsearchCache
debug bool
}
func NewElasticsearchFS(urls string, pageSize int, debug bool) (*ElasticsearchFS, error) {
cache, err := NewElasticsearchCache(urls, pageSize)
if err != nil {
return nil, err
}
var fs ElasticsearchFS
fs.FileSystem = pathfs.NewDefaultFileSystem()
fs.cache = cache
fs.debug = debug
return &fs, nil
}
func (fs *ElasticsearchFS) GetAttr(name string, context *fuse.Context) (*fuse.Attr, fuse.Status) {
if fs.debug {
log.Printf("GetAttr: name=%v\n", name)
}
// Return the attribute of the root directory
if name == "" {
return &fuse.Attr{Mode: fuse.S_IFDIR | 0555}, fuse.OK
}
// Return the attribute of the index directory
nameElems := strings.Split(name, "/")
if len(nameElems) == 1 {
indexs, err := fs.cache.EnsureIndexNames()
if err != nil {
log.Fatalf("Failed to ensure the index names: err=%v\n", err)
}
for _, index := range indexs {
if nameElems[0] == index {
return &fuse.Attr{Mode: fuse.S_IFDIR | 0555}, fuse.OK
}
}
}
// Return the attributes of the document type directory
if len(nameElems) == 2 {
dtypes, err := fs.cache.EnsureDocumentTypes(nameElems[0])
if err != nil {
log.Fatalf("Failed to ensure the document types: index=%v, err=%v\n", nameElems[0], err)
}
for _, dtype := range dtypes {
if nameElems[1] == dtype {
return &fuse.Attr{Mode: fuse.S_IFDIR | 0555}, fuse.OK
}
}
}
// Return the attributes of the paging directory
if len(nameElems) == 3 {
total, err := fs.cache.EnsureDocumentTotal(nameElems[0], nameElems[1])
if err != nil {
log.Fatalf("Failed to ensure the docs: index=%v, dtype=%v, err=%v\n", nameElems[0], nameElems[1], err)
}
page, err := strconv.Atoi(nameElems[2])
if err != nil {
log.Fatalf("Failed to parse the paging directory name as integer: index=%v, dtype=%v, page=%v, err=%v\n", nameElems[0], nameElems[1], nameElems[2], err)
}
from := int64(fs.cache.pageSize * page)
if from < total {
return &fuse.Attr{Mode: fuse.S_IFDIR | 0555}, fuse.OK
}
}
// Return the attributes of the document file
if len(nameElems) == 4 {
page, err := strconv.ParseInt(nameElems[2], 10, 0)
if err != nil {
log.Fatalf("Failed to parse the paging directory name as integer: index=%v, dtype=%v, page=%v, err=%v\n", nameElems[0], nameElems[1], nameElems[2], err)
}
docs, err := fs.cache.EnsureDocuments(nameElems[0], nameElems[1], int(page))
if err != nil {
log.Fatalf("Failed to ensure the docs: index=%v, dtype=%v, err=%v\n", nameElems[0], nameElems[1], err)
}
docSource, ok := docs[nameElems[3]]
fileSize := uint64(len(docSource))
if ok {
return &fuse.Attr{Mode: fuse.S_IFREG | 0444, Size: fileSize}, fuse.OK
}
}
return nil, fuse.ENOENT
}
func (fs *ElasticsearchFS) OpenDir(name string, context *fuse.Context) (entries []fuse.DirEntry, st fuse.Status) {
if fs.debug {
log.Printf("OpenDir: name=%v\n", name)
}
// If the root directory is opened, list up index names as the directory entries.
if name == "" {
indexs, err := fs.cache.EnsureIndexNames()
if err != nil {
log.Fatalf("Failed to ensure the index names: err=%v\n", err)
}
for _, index := range indexs {
entries = append(entries, fuse.DirEntry{Name: index, Mode: fuse.S_IFDIR})
}
return entries, fuse.OK
}
// If the index directory is opened, list up document types as the directory entries.
nameElems := strings.Split(name, "/")
if len(nameElems) == 1 {
dtypes, err := fs.cache.EnsureDocumentTypes(nameElems[0])
if err != nil {
log.Fatalf("Failed to ensure the document types: index=%v, err=%v\n", nameElems[0], err)
}
for _, dtype := range dtypes {
entries = append(entries, fuse.DirEntry{Name: dtype, Mode: fuse.S_IFDIR})
}
return entries, fuse.OK
}
// If the document type directory is opened, list up docs as the file entries.
if len(nameElems) == 2 {
total, err := fs.cache.EnsureDocumentTotal(nameElems[0], nameElems[1])
if err != nil {
log.Fatalf("Failed to ensure the docs: index=%v, dtype=%v, err=%v\n", nameElems[0], nameElems[1], err)
}
for i := 0; int64(i*fs.cache.pageSize) < total; i++ {
entries = append(entries, fuse.DirEntry{Name: strconv.Itoa(i), Mode: fuse.S_IFREG})
}
return entries, fuse.OK
}
// If the document type directory is opened, list up docs as the file entries.
if len(nameElems) == 3 {
page, err := strconv.Atoi(nameElems[2])
if err != nil {
log.Fatalf("Failed to parse the paging directory name as integer: index=%v, dtype=%v, page=%v, err=%v\n", nameElems[0], nameElems[1], nameElems[2], err)
}
docs, err := fs.cache.EnsureDocuments(nameElems[0], nameElems[1], int(page))
if err != nil {
log.Fatalf("Failed to ensure the docs: index=%v, dtype=%v, page=%v, err=%v\n", nameElems[0], nameElems[1], nameElems[2], err)
}
for docID := range docs {
entries = append(entries, fuse.DirEntry{Name: docID, Mode: fuse.S_IFREG})
}
return entries, fuse.OK
}
return nil, fuse.ENOENT
}
func (fs *ElasticsearchFS) Open(name string, flags uint32, context *fuse.Context) (file nodefs.File, st fuse.Status) {
if fs.debug {
log.Printf("Open: name=%v, flags=%x\n", name, flags)
}
nameElems := strings.Split(name, "/")
if len(nameElems) == 4 {
page, err := strconv.Atoi(nameElems[2])
if err != nil {
log.Fatalf("Failed to parse the paging directory name as integer: index=%v, dtype=%v, page=%v, err=%v\n", nameElems[0], nameElems[1], nameElems[2], err)
}
docs, err := fs.cache.EnsureDocuments(nameElems[0], nameElems[1], page)
if err != nil {
log.Fatalf("Failed to ensure the docs: index=%v, dtype=%v, page=%v, err=%v\n", nameElems[0], nameElems[1], page, err)
}
docSource, ok := docs[nameElems[3]]
if ok {
return nodefs.NewDataFile(docSource), fuse.OK
}
}
return nil, fuse.ENOENT
}