ceph-csi/vendor/github.com/ceph/go-ceph/rados/read_op.go
dependabot[bot] d05847ee73 rebase: bump github.com/ceph/go-ceph from 0.20.0 to 0.21.0
Bumps [github.com/ceph/go-ceph](https://github.com/ceph/go-ceph) from 0.20.0 to 0.21.0.
- [Release notes](https://github.com/ceph/go-ceph/releases)
- [Changelog](https://github.com/ceph/go-ceph/blob/master/docs/release-process.md)
- [Commits](https://github.com/ceph/go-ceph/compare/v0.20.0...v0.21.0)

---
updated-dependencies:
- dependency-name: github.com/ceph/go-ceph
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>
2023-04-26 17:29:31 +00:00

92 lines
2.1 KiB
Go

package rados
// #cgo LDFLAGS: -lrados
// #include <errno.h>
// #include <stdlib.h>
// #include <rados/librados.h>
//
import "C"
import (
"unsafe"
)
// ReadOp manages a set of discrete object read actions that will be performed
// together atomically.
type ReadOp struct {
operation
op C.rados_read_op_t
}
// CreateReadOp returns a newly constructed read operation.
func CreateReadOp() *ReadOp {
return &ReadOp{
op: C.rados_create_read_op(),
}
}
// Release the resources associated with this read operation.
func (r *ReadOp) Release() {
C.rados_release_read_op(r.op)
r.op = nil
r.free()
}
// Operate will perform the operation(s).
func (r *ReadOp) Operate(ioctx *IOContext, oid string, flags OperationFlags) error {
if err := ioctx.validate(); err != nil {
return err
}
cOid := C.CString(oid)
defer C.free(unsafe.Pointer(cOid))
ret := C.rados_read_op_operate(r.op, ioctx.ioctx, cOid, C.int(flags))
return r.update(readOp, ret)
}
func (r *ReadOp) operateCompat(ioctx *IOContext, oid string) error {
switch err := r.Operate(ioctx, oid, OperationNoFlag).(type) {
case nil:
return nil
case OperationError:
return err.OpError
default:
return err
}
}
// AssertExists assures the object targeted by the read op exists.
//
// Implements:
//
// void rados_read_op_assert_exists(rados_read_op_t read_op);
func (r *ReadOp) AssertExists() {
C.rados_read_op_assert_exists(r.op)
}
// GetOmapValues is used to iterate over a set, or sub-set, of omap keys
// as part of a read operation. An GetOmapStep is returned from this
// function. The GetOmapStep may be used to iterate over the key-value
// pairs after the Operate call has been performed.
func (r *ReadOp) GetOmapValues(startAfter, filterPrefix string, maxReturn uint64) *GetOmapStep {
gos := newGetOmapStep()
r.steps = append(r.steps, gos)
cStartAfter := C.CString(startAfter)
cFilterPrefix := C.CString(filterPrefix)
defer C.free(unsafe.Pointer(cStartAfter))
defer C.free(unsafe.Pointer(cFilterPrefix))
C.rados_read_op_omap_get_vals2(
r.op,
cStartAfter,
cFilterPrefix,
C.uint64_t(maxReturn),
&gos.iter,
gos.more,
gos.rval,
)
return gos
}