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// -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
// vim: ts=8 sw=2 smarttab
#include <errno.h>
#include "objclass/objclass.h"
#include "cls/version/cls_version_ops.h"
#include "include/compat.h"
using std::list;
using ceph::bufferlist;
CLS_VER(1,0)
CLS_NAME(version)
#define VERSION_ATTR "ceph.objclass.version"
static int set_version(cls_method_context_t hctx, struct obj_version *objv)
{
bufferlist bl;
encode(*objv, bl);
CLS_LOG(20, "cls_version: set_version %s:%d", objv->tag.c_str(), (int)objv->ver);
int ret = cls_cxx_setxattr(hctx, VERSION_ATTR, &bl);
if (ret < 0)
return ret;
return 0;
}
static int init_version(cls_method_context_t hctx, struct obj_version *objv)
{
#define TAG_LEN 24
char buf[TAG_LEN + 1];
int ret = cls_gen_rand_base64(buf, sizeof(buf));
if (ret < 0)
return ret;
objv->ver = 1;
objv->tag = buf;
CLS_LOG(20, "cls_version: init_version %s:%d", objv->tag.c_str(), (int)objv->ver);
return set_version(hctx, objv);
}
/* implicit create should be true only if called from a write operation (set, inc), never from a read operation (read, check) */
static int read_version(cls_method_context_t hctx, obj_version *objv, bool implicit_create)
{
bufferlist bl;
int ret = cls_cxx_getxattr(hctx, VERSION_ATTR, &bl);
if (ret == -ENOENT || ret == -ENODATA) {
objv->ver = 0;
if (implicit_create) {
return init_version(hctx, objv);
}
return 0;
}
if (ret < 0)
return ret;
try {
auto iter = bl.cbegin();
decode(*objv, iter);
} catch (ceph::buffer::error& err) {
CLS_LOG(0, "ERROR: read_version(): failed to decode version entry\n");
return -EIO;
}
CLS_LOG(20, "cls_version: read_version %s:%d", objv->tag.c_str(), (int)objv->ver);
return 0;
}
static int cls_version_set(cls_method_context_t hctx, bufferlist *in, bufferlist *out)
{
auto in_iter = in->cbegin();
cls_version_set_op op;
try {
decode(op, in_iter);
} catch (ceph::buffer::error& err) {
CLS_LOG(1, "ERROR: cls_version_get(): failed to decode entry\n");
return -EINVAL;
}
int ret = set_version(hctx, &op.objv);
if (ret < 0)
return ret;
return 0;
}
static bool check_conds(list<obj_version_cond>& conds, obj_version& objv)
{
if (conds.empty())
return true;
for (list<obj_version_cond>::iterator iter = conds.begin(); iter != conds.end(); ++iter) {
obj_version_cond& cond = *iter;
obj_version& v = cond.ver;
CLS_LOG(20, "cls_version: check_version %s:%d (cond=%d)", v.tag.c_str(), (int)v.ver, (int)cond.cond);
switch (cond.cond) {
case VER_COND_NONE:
break;
case VER_COND_EQ:
if (!objv.compare(&v))
return false;
break;
case VER_COND_GT:
if (!(objv.ver > v.ver))
return false;
break;
case VER_COND_GE:
if (!(objv.ver >= v.ver))
return false;
break;
case VER_COND_LT:
if (!(objv.ver < v.ver))
return false;
break;
case VER_COND_LE:
if (!(objv.ver <= v.ver))
return false;
break;
case VER_COND_TAG_EQ:
if (objv.tag.compare(v.tag) != 0)
return false;
break;
case VER_COND_TAG_NE:
if (objv.tag.compare(v.tag) == 0)
return false;
break;
}
}
return true;
}
static int cls_version_inc(cls_method_context_t hctx, bufferlist *in, bufferlist *out)
{
auto in_iter = in->cbegin();
cls_version_inc_op op;
try {
decode(op, in_iter);
} catch (ceph::buffer::error& err) {
CLS_LOG(1, "ERROR: cls_version_get(): failed to decode entry\n");
return -EINVAL;
}
obj_version objv;
int ret = read_version(hctx, &objv, true);
if (ret < 0)
return ret;
if (!check_conds(op.conds, objv)) {
return -ECANCELED;
}
objv.inc();
ret = set_version(hctx, &objv);
if (ret < 0)
return ret;
return 0;
}
static int cls_version_check(cls_method_context_t hctx, bufferlist *in, bufferlist *out)
{
auto in_iter = in->cbegin();
cls_version_check_op op;
try {
decode(op, in_iter);
} catch (ceph::buffer::error& err) {
CLS_LOG(1, "ERROR: cls_version_get(): failed to decode entry\n");
return -EINVAL;
}
obj_version objv;
int ret = read_version(hctx, &objv, false);
if (ret < 0)
return ret;
if (!check_conds(op.conds, objv)) {
CLS_LOG(20, "cls_version: failed condition check");
return -ECANCELED;
}
return 0;
}
static int cls_version_read(cls_method_context_t hctx, bufferlist *in, bufferlist *out)
{
obj_version objv;
cls_version_read_ret read_ret;
int ret = read_version(hctx, &read_ret.objv, false);
if (ret < 0)
return ret;
encode(read_ret, *out);
return 0;
}
CLS_INIT(version)
{
CLS_LOG(1, "Loaded version class!");
cls_handle_t h_class;
cls_method_handle_t h_version_set;
cls_method_handle_t h_version_inc;
cls_method_handle_t h_version_inc_conds;
cls_method_handle_t h_version_read;
cls_method_handle_t h_version_check_conds;
cls_register("version", &h_class);
/* version */
cls_register_cxx_method(h_class, "set", CLS_METHOD_RD | CLS_METHOD_WR, cls_version_set, &h_version_set);
cls_register_cxx_method(h_class, "inc", CLS_METHOD_RD | CLS_METHOD_WR, cls_version_inc, &h_version_inc);
cls_register_cxx_method(h_class, "inc_conds", CLS_METHOD_RD | CLS_METHOD_WR, cls_version_inc, &h_version_inc_conds);
cls_register_cxx_method(h_class, "read", CLS_METHOD_RD, cls_version_read, &h_version_read);
cls_register_cxx_method(h_class, "check_conds", CLS_METHOD_RD, cls_version_check, &h_version_check_conds);
return;
}
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