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object.go
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object.go
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//
// (C) Copyright 2021-2022 Intel Corporation.
//
// SPDX-License-Identifier: BSD-2-Clause-Patent
//
package main
import (
"encoding/json"
"unsafe"
"github.com/jessevdk/go-flags"
"github.com/pkg/errors"
)
/*
#include "util.h"
#include <daos/object.h>
*/
import "C"
type objectCmd struct {
Query objQueryCmd `command:"query" description:"query an object's layout"`
//ListKeys objListKeysCmd `command:"list-keys" description:"list an object's keys"`
//Dump objDumpCmd `command:"dump" description:"dump an object's contents"`
}
type objBaseCmd struct {
existingContainerCmd
ObjectIDFlag OidFlag `long:"oid" short:"i" description:"DAOS object id (deprecated; use positional arg)"`
Args struct {
ObjectID OidFlag `positional-arg-name:"<DAOS object id (HI.LO)>"`
} `positional-args:"yes"`
}
func (cmd *objBaseCmd) getOid() (C.daos_obj_id_t, error) {
if cmd.ObjectIDFlag.Set && cmd.Args.ObjectID.Set {
return C.daos_obj_id_t{}, errors.New("can't specify --oid and positional argument")
}
if cmd.ObjectIDFlag.Set {
cmd.Args.ObjectID.Set = true
cmd.Args.ObjectID.Oid = cmd.ObjectIDFlag.Oid
}
if !cmd.Args.ObjectID.Set {
return C.daos_obj_id_t{}, &flags.Error{flags.ErrRequired, "OID is a required argument"}
}
return cmd.Args.ObjectID.Oid, nil
}
type objQueryCmd struct {
objBaseCmd
}
type shardLocation struct {
Rank uint32 `json:"rank"`
Target uint32 `json:"target"`
}
type objectShard struct {
Replicas []*shardLocation `json:"replicas"`
}
type objectLayout struct {
OID C.daos_obj_id_t `json:"-"`
Version uint32 `json:"version"`
Class string `json:"class"`
Shards []*objectShard `json:"shards"`
}
func (ol *objectLayout) MarshalJSON() ([]byte, error) {
type toJSON objectLayout
return json.Marshal(&struct {
OID string `json:"oid"`
*toJSON
}{
OID: oidString(ol.OID),
toJSON: (*toJSON)(ol),
})
}
func shardLocations(shard *C.struct_daos_obj_shard) []*shardLocation {
locations := make([]*shardLocation, shard.os_replica_nr)
// https://github.com/golang/go/issues/11925#issuecomment-128405123
// NB: https://pkg.go.dev/unsafe#Pointer dictates that this must be done in one step!
locsSlice := unsafe.Slice((*C.struct_daos_shard_loc)(unsafe.Pointer(uintptr(unsafe.Pointer(shard))+C.sizeof_struct_daos_obj_shard)), shard.os_replica_nr)
for i, cLoc := range locsSlice {
locations[i] = &shardLocation{
Rank: uint32(cLoc.sd_rank),
Target: uint32(cLoc.sd_tgt_idx),
}
}
return locations
}
func layoutShards(layout *C.struct_daos_obj_layout) []*objectShard {
shards := make([]*objectShard, layout.ol_nr)
// https://github.com/golang/go/issues/11925#issuecomment-128405123
// NB: https://pkg.go.dev/unsafe#Pointer dictates that this must be done in one step!
shardSlice := unsafe.Slice((**C.struct_daos_obj_shard)(unsafe.Pointer(uintptr(unsafe.Pointer(layout))+C.sizeof_struct_daos_obj_layout)), int(layout.ol_nr))
for i, cShard := range shardSlice {
shards[i] = &objectShard{
Replicas: shardLocations(cShard),
}
}
return shards
}
func newObjLayout(oid C.daos_obj_id_t, layout *C.struct_daos_obj_layout) *objectLayout {
var oclass [10]C.char
C.daos_oclass_id2name(C.daos_obj_id2class(oid), &oclass[0])
return &objectLayout{
OID: oid,
Version: uint32(layout.ol_ver),
Class: C.GoString(&oclass[0]),
Shards: layoutShards(layout),
}
}
func (cmd *objQueryCmd) Execute(_ []string) error {
oid, err := cmd.getOid()
if err != nil {
return err
}
ap, deallocCmdArgs, err := allocCmdArgs(cmd.Logger)
if err != nil {
return err
}
defer deallocCmdArgs()
cleanup, err := cmd.resolveAndConnect(C.DAOS_COO_RO, ap)
if err != nil {
return err
}
defer cleanup()
var cLayout *C.struct_daos_obj_layout
if err := daosError(C.daos_obj_layout_get(ap.cont, oid, &cLayout)); err != nil {
return errors.Wrapf(err, "failed to retrieve layout for object %s", cmd.Args.ObjectID.String())
}
defer C.daos_obj_layout_free(cLayout)
layout := newObjLayout(oid, cLayout)
if cmd.JSONOutputEnabled() {
return cmd.OutputJSON(layout, nil)
}
// TODO: Revisit this output to make it more non-developer friendly.
// For the moment, retain compatibility with the old daos tool.
cmd.Infof("oid: %s ver %d grp_nr: %d", oidString(oid), layout.Version, cLayout.ol_nr)
for i, shard := range layout.Shards {
cmd.Infof("grp: %d", i)
for j, replica := range shard.Replicas {
cmd.Infof("replica %d %d", j, replica.Rank)
}
}
return nil
}