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pgfs.go
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pgfs.go
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//go:build (linux || freebsd)
package main
import (
"context"
"log"
"os"
"fmt"
"syscall"
"github.com/jackc/pgx/v4/pgxpool"
// "github.com/jackc/pgx/v4"
"github.com/lib/pq"
"bazil.org/fuse"
"bazil.org/fuse/fs"
)
func pgfs(config tomlConfig, dbpool *pgxpool.Pool, fuseDone chan bool) {
if ! config.PGFS.Enabled {
log.Printf("PGFS is not enabled.")
} else {
log.Printf("Mounting PGFS Filesystem: %s\n\n", config.PGFS.MountDirectory)
c, err := fuse.Mount(
config.PGFS.MountDirectory,
fuse.FSName("pgfsfs"),
fuse.Subtype("pgfs"),
)
if err != nil {
log.Fatal(err)
}
defer c.Close()
err = fs.Serve(c, FS{dbpool: dbpool})
if err != nil {
log.Fatal(err)
}
fuseDone <- true
}
}
//
// File System
//
type FS struct{
dbpool *pgxpool.Pool
}
func (f FS) Root() (fs.Node, error) {
return Dir{f}, nil
}
//
// Root Directory
//
type Dir struct{
fs FS
}
func (Dir) Attr(ctx context.Context, a *fuse.Attr) error {
a.Inode = 1
a.Uid = uint32(syscall.Geteuid())
a.Gid = uint32(syscall.Getegid())
a.Mode = os.ModeDir | 0o500
return nil
}
func (d Dir) Lookup(ctx context.Context, name string) (fs.Node, error) {
var exists bool
q := fmt.Sprintf("select exists(select 1 from meta.schema where name=%s)", pq.QuoteLiteral(name))
err := d.fs.dbpool.QueryRow(context.Background(), q).Scan(&exists)
if err != nil {
log.Println("Dir Lookup: Error querying database: ", err)
return nil, fuse.ENOENT
}
if exists {
return SchemaDir{d.fs, name}, nil
}
return nil, fuse.ENOENT
}
func (d Dir) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
q := fmt.Sprintf("select name from meta.schema")
rows, err := d.fs.dbpool.Query(context.Background(), q)
if err != nil {
log.Fatal("Dir ReadDirAll: Error querying database: ", err)
}
defer rows.Close()
var dirDirs []fuse.Dirent
for rows.Next() {
var name string
err := rows.Scan(&name)
if err != nil {
log.Fatal("Dir ReadDirAll: Error scanning row", err)
continue
}
// log.Println("Schema:", name)
dirDirs = append(dirDirs, fuse.Dirent{
Inode: 2,
Name: name,
Type: fuse.DT_Dir,
})
}
if rows.Err() != nil {
log.Fatal("Dir ReadDirAll: Error iterating rows", rows.Err())
}
return append(dirDirs,
fuse.Dirent{Name: ".", Type: fuse.DT_Dir},
fuse.Dirent{Name: "..", Type: fuse.DT_Dir}), nil
}
//
// SchemaDir
//
type SchemaDir struct{
fs FS
schema_name string
}
func (d SchemaDir) Attr(ctx context.Context, a *fuse.Attr) error {
a.Inode = 1
a.Uid = uint32(syscall.Geteuid())
a.Gid = uint32(syscall.Getegid())
a.Mode = os.ModeDir | 0o500
return nil
}
func (d SchemaDir) Lookup(ctx context.Context, name string) (fs.Node, error) {
var exists bool
var pk_column_name string
pkQ := fmt.Sprintf("select (primary_key_column_ids[1]).name as pk_column_name from meta.relation where schema_name=%s and name=%s and primary_key_column_ids is not null",
pq.QuoteLiteral(d.schema_name),
pq.QuoteLiteral(name))
// check that relation exists
existsQ := fmt.Sprintf("select exists(%s)", pkQ)
err := d.fs.dbpool.QueryRow(context.Background(), existsQ).Scan(&exists)
if err != nil {
log.Fatal("Error in SchemaDir Lookup exists: ", err)
return nil, fuse.ENOENT
}
if !exists {
return nil, fuse.ENOENT
}
// get its primary key, for use as variable in TableDir struct
err = d.fs.dbpool.QueryRow(context.Background(), pkQ).Scan(&pk_column_name)
if err != nil {
log.Fatal("Error in SchemaDir Lookup pk query: ", err)
return nil, fuse.ENOENT
}
return TableDir{d.fs, d.schema_name, name, pk_column_name}, nil
}
func (d SchemaDir) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
q := fmt.Sprintf("select name from meta.relation where schema_name=%s and primary_key_column_ids is not null",
pq.QuoteLiteral(d.schema_name))
rows, err := d.fs.dbpool.Query(context.Background(), q)
if err != nil {
log.Fatal("SchemaDir ReadDirAll(): Error querying database: ", err)
}
defer rows.Close()
var dirDirs []fuse.Dirent
for rows.Next() {
var name string
err := rows.Scan(&name)
if err != nil {
log.Fatal("SchemaDir ReadDirAll(): Error scanning row", err)
continue
}
// log.Println("Relation: ", name)
dirDirs = append(dirDirs, fuse.Dirent{
Inode: 2,
Name: name,
Type: fuse.DT_Dir,
})
}
if rows.Err() != nil {
log.Fatal("SchemaDir ReadDirAll(): Error iterating rows", rows.Err())
}
return append(dirDirs,
fuse.Dirent{Name: ".", Type: fuse.DT_Dir},
fuse.Dirent{Name: "..", Type: fuse.DT_Dir}), nil
}
//
// TableDir
//
type TableDir struct{
fs FS
schema_name string
table_name string
pk_column_name string
}
func (TableDir) Attr(ctx context.Context, a *fuse.Attr) error {
a.Inode = 1
a.Uid = uint32(syscall.Geteuid())
a.Gid = uint32(syscall.Getegid())
a.Mode = os.ModeDir | 0o500
return nil
}
func (d TableDir) Lookup(ctx context.Context, name string) (fs.Node, error) {
var exists bool
q := fmt.Sprintf("select exists(select 1 from %s.%s where %s::text=%s)",
pq.QuoteIdentifier(d.schema_name),
pq.QuoteIdentifier(d.table_name),
pq.QuoteIdentifier(d.pk_column_name),
pq.QuoteLiteral(name))
err := d.fs.dbpool.QueryRow(context.Background(), q).Scan(&exists)
if err != nil {
log.Println("TableDir Lookup(): Error querying database: ", err)
return nil, fuse.ENOENT
}
if exists {
return RowDir{d.fs, d.schema_name, d.table_name, d.pk_column_name, name}, nil
}
return nil, fuse.ENOENT
}
func (d TableDir) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
q := fmt.Sprintf("select %s as pk_value from %s.%s",
pq.QuoteIdentifier(d.pk_column_name),
pq.QuoteIdentifier(d.schema_name),
pq.QuoteIdentifier(d.table_name))
rows, err := d.fs.dbpool.Query(context.Background(), q)
if err != nil {
log.Fatal("TableDir ReadDirAll(): Error querying database: ", err)
}
defer rows.Close()
var dirDirs []fuse.Dirent
for rows.Next() {
var pk_value string
err := rows.Scan(&pk_value)
if err != nil {
log.Fatal("TableDir ReadDirAll(): Error scanning row", err)
continue
}
// log.Println("Primary Key:", pk_value)
dirDirs = append(dirDirs, fuse.Dirent{
Inode: 2,
Name: pk_value,
Type: fuse.DT_Dir,
})
}
if rows.Err() != nil {
log.Fatal("TableDir ReadDirAll(): Error iterating rows", rows.Err())
}
return dirDirs, nil
}
//
// RowDir
//
type RowDir struct{
fs FS
schema_name string
table_name string
pk_column_name string
pk_value string
}
func (RowDir) Attr(ctx context.Context, a *fuse.Attr) error {
a.Inode = 1
a.Uid = uint32(syscall.Geteuid())
a.Gid = uint32(syscall.Getegid())
a.Mode = os.ModeDir | 0o500
return nil
}
/*
func (d RowDir) Lookup(ctx context.Context, name string) (fs.Node, error) {
return FieldFile{d.fs, d.schema_name, d.table_name, name, d.pk_column_name, d.pk_value}, nil
}
*/
func (d RowDir) Lookup(ctx context.Context, name string) (fs.Node, error) {
// log.Println("RowDir Lookup(): name=", name)
var columnExists bool
var rowExists bool
// check that this column exists (we could probably make this a lot faster by sending garbage queries to the db)
existsQ := fmt.Sprintf("select exists(select 1 from meta.relation_column where schema_name=%s and relation_name=%s and name=%s)",
pq.QuoteLiteral(d.schema_name),
pq.QuoteLiteral(d.table_name),
pq.QuoteLiteral(name))
// log.Println("existsQ", existsQ)
err := d.fs.dbpool.QueryRow(context.Background(), existsQ).Scan(&columnExists)
if err != nil {
log.Fatal("RowDir Lookup(): Error in column exists check: ", err)
}
if !columnExists {
return nil, fuse.ENOENT
}
// check that row exists
q := fmt.Sprintf("select exists(select %s from %s.%s where %s::text=%s)",
pq.QuoteIdentifier(name),
pq.QuoteIdentifier(d.schema_name),
pq.QuoteIdentifier(d.table_name),
pq.QuoteIdentifier(d.pk_column_name),
pq.QuoteLiteral(d.pk_value))
err = d.fs.dbpool.QueryRow(context.Background(), q).Scan(&rowExists)
if err != nil {
log.Fatal("RowDir Lookup(): Error in row exists check: ", err)
}
if !rowExists {
return nil, fuse.ENOENT
}
f := FieldFile{
fs: d.fs,
schema_name: d.schema_name,
table_name: d.table_name,
column_name: name,
pk_column_name: d.pk_column_name,
pk_value: d.pk_value,
}
return f, nil;
// was: return FieldFile{d.fs, d.schema_name, d.table_name, name, d.pk_column_name, d.pk_value}, nil
}
func (d RowDir) ReadDirAll(ctx context.Context) ([]fuse.Dirent, error) {
q := fmt.Sprintf("select name as column_name from meta.column where schema_name=%s and relation_name=%s",
pq.QuoteLiteral(d.schema_name),
pq.QuoteLiteral(d.table_name))
rows, err := d.fs.dbpool.Query(context.Background(), q)
if err != nil {
log.Fatal("RowDir ReadDirAll(): Error querying database: ", err)
}
defer rows.Close()
var dirDirs []fuse.Dirent
for rows.Next() {
var column_name string
err := rows.Scan(&column_name)
if err != nil {
log.Fatal("RowDir ReadDirAll(): Error scanning row: ", err)
continue
}
// log.Println("Schema:", column_name)
dirDirs = append(dirDirs, fuse.Dirent{
Inode: 2,
Name: column_name,
Type: fuse.DT_File,
})
}
if rows.Err() != nil {
log.Fatal("RowDir ReadDirAll(): Error iterating rows", rows.Err())
}
return append(dirDirs,
fuse.Dirent{Name: ".", Type: fuse.DT_Dir},
fuse.Dirent{Name: "..", Type: fuse.DT_Dir}), nil
}
//
// FieldFile
//
var fileBuffers = make(map[string]string)
type FieldFile struct{
fs FS
schema_name string
table_name string
column_name string
pk_column_name string
pk_value string
}
func (ff FieldFile) Attr(ctx context.Context, a *fuse.Attr) error {
var octet_length int
q := fmt.Sprintf("select coalesce(octet_length(%s::text)::integer, 0) as octet_length from %s.%s where %s = %s",
pq.QuoteIdentifier(ff.column_name),
pq.QuoteIdentifier(ff.schema_name),
pq.QuoteIdentifier(ff.table_name),
pq.QuoteIdentifier(ff.pk_column_name),
pq.QuoteLiteral(ff.pk_value))
// fmt.Println(q)
err := ff.fs.dbpool.QueryRow(context.Background(), q).Scan(&octet_length)
if err != nil {
log.Fatal("FileField Attr(): Error querying database: ", err)
}
a.Inode = 2
a.Size = uint64(octet_length)
a.Uid = uint32(syscall.Geteuid())
a.Gid = uint32(syscall.Getegid())
a.Mode = 0o644
return nil
}
func (ff FieldFile) ReadAll(ctx context.Context) ([]byte, error) {
var content string
q := fmt.Sprintf("select %s::text as content from %s.%s where %s = %s",
pq.QuoteIdentifier(ff.column_name),
pq.QuoteIdentifier(ff.schema_name),
pq.QuoteIdentifier(ff.table_name),
pq.QuoteIdentifier(ff.pk_column_name),
pq.QuoteLiteral(ff.pk_value))
err := ff.fs.dbpool.QueryRow(context.Background(), q).Scan(&content)
if err != nil {
log.Fatal("FileField ReadDirAll(): Error querying database: ", err)
}
return []byte(content), nil
}
func (ff FieldFile) Write(ctx context.Context, req *fuse.WriteRequest, resp *fuse.WriteResponse) error {
/*
log.Printf("######## FieldFile Write():\n req.Offset: %d\n req.Data: %s...",
req.Offset, req.Data[0:19])
log.Printf(" fileBuffers[%s] %s", key, fileBuffers[key]);
*/
var key = ff.schema_name+"/"+ff.table_name+"/"+ff.pk_value+"/"+ff.column_name
fileBuffers[key] = fileBuffers[key] + string(req.Data)
resp.Size = len(req.Data)
return nil
}
func (ff FieldFile) Fsync(ctx context.Context, req *fuse.FsyncRequest) error {
var key = ff.schema_name+"/"+ff.table_name+"/"+ff.pk_value+"/"+ff.column_name
// log.Printf("!!!!!!!! Fsync called:\n fileBuffers[%s] %s", key, fileBuffers[key]);
q := fmt.Sprintf("update %s.%s set %s = %s where %s = %s",
pq.QuoteIdentifier(ff.schema_name),
pq.QuoteIdentifier(ff.table_name),
pq.QuoteIdentifier(ff.column_name),
pq.QuoteLiteral(fileBuffers[key]),
pq.QuoteIdentifier(ff.pk_column_name),
pq.QuoteLiteral(ff.pk_value))
_, err := ff.fs.dbpool.Exec(context.Background(), q)
// log.Println("Fsync field update q: ",q)
if err != nil {
// Handle error
log.Printf("FieldFile Flush(): update stmt failed. ",q,err)
}
fileBuffers[key] = ""
return nil
}
func (ff FieldFile) Flush(ctx context.Context, req *fuse.WriteRequest, resp *fuse.WriteResponse) error {
log.Fatal("######## Flush() called and we don't know what this does.")
/*
fs.mu.Lock()
defer fs.mu.Unlock()
q := fmt.sprintf("update %s.%s set %s = %s where %s = %s",
pq.quoteidentifier(ff.schema_name),
pq.quoteidentifier(ff.table_name),
pq.quoteidentifier(ff.column_name),
pq.quoteliteral(string(req.data)),
pq.quoteidentifier(ff.pk_column_name),
pq.quoteliteral(ff.pk_value))
_, err := ff.fs.dbpool.exec(context.background(), q)
if err != nil {
// handle error
log.printf("fieldfile flush(): update stmt failed. ",q,err)
}
*/
return nil
}