go-ceph/pool.go

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package rados
// #cgo LDFLAGS: -lrados
// #include <stdlib.h>
// #include <rados/librados.h>
import "C"
import "unsafe"
// Pool represents a context for performing I/O within a pool.
type Pool struct {
ioctx C.rados_ioctx_t
}
// Write writes len(data) bytes to the object with key oid starting at byte
// offset offset. It returns an error, if any.
func (p *Pool) Write(oid string, data []byte, offset uint64) error {
c_oid := C.CString(oid)
defer C.free(unsafe.Pointer(c_oid))
ret := C.rados_write(p.ioctx, c_oid,
(*C.char)(unsafe.Pointer(&data[0])),
(C.size_t)(len(data)),
(C.uint64_t)(offset))
if ret == 0 {
return nil
} else {
return RadosError(int(ret))
}
}
// Read reads up to len(data) bytes from the object with key oid starting at byte
// offset offset. It returns the number of bytes read and an error, if any.
func (p *Pool) Read(oid string, data []byte, offset uint64) (int, error) {
if len(data) == 0 {
return 0, nil
}
c_oid := C.CString(oid)
defer C.free(unsafe.Pointer(c_oid))
ret := C.rados_read(
p.ioctx,
c_oid,
(*C.char)(unsafe.Pointer(&data[0])),
(C.size_t)(len(data)),
(C.uint64_t)(offset))
if ret >= 0 {
return int(ret), nil
} else {
return 0, RadosError(int(ret))
}
}
// Delete deletes the object with key oid. It returns an error, if any.
func (p *Pool) Delete(oid string) error {
c_oid := C.CString(oid)
defer C.free(unsafe.Pointer(c_oid))
ret := C.rados_remove(p.ioctx, c_oid)
if ret == 0 {
return nil
} else {
return RadosError(int(ret))
}
}
// Truncate resizes the object with key oid to size size. If the operation
// enlarges the object, the new area is logically filled with zeroes. If the
// operation shrinks the object, the excess data is removed. It returns an
// error, if any.
func (p *Pool) Truncate(oid string, size uint64) error {
c_oid := C.CString(oid)
defer C.free(unsafe.Pointer(c_oid))
ret := C.rados_trunc(p.ioctx, c_oid, (C.uint64_t)(size))
if ret == 0 {
return nil
} else {
return RadosError(int(ret))
}
}