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/*
Copyright 2020 Google LLC
Use of this source code is governed by a BSD-style
license that can be found in the LICENSE file or at
https://developers.google.com/open-source/licenses/bsd
*/
#include "constants.h"
#include "record.h"
#include "generic.h"
#include "reftable-iterator.h"
#include "reftable-generic.h"
void table_init_iter(struct reftable_table *tab,
struct reftable_iterator *it,
uint8_t typ)
{
tab->ops->init_iter(tab->table_arg, it, typ);
}
void reftable_table_init_ref_iter(struct reftable_table *tab,
struct reftable_iterator *it)
{
table_init_iter(tab, it, BLOCK_TYPE_REF);
}
void reftable_table_init_log_iter(struct reftable_table *tab,
struct reftable_iterator *it)
{
table_init_iter(tab, it, BLOCK_TYPE_LOG);
}
int reftable_iterator_seek_ref(struct reftable_iterator *it,
const char *name)
{
struct reftable_record want = {
.type = BLOCK_TYPE_REF,
.u.ref = {
.refname = (char *)name,
},
};
return it->ops->seek(it->iter_arg, &want);
}
int reftable_iterator_seek_log_at(struct reftable_iterator *it,
const char *name, uint64_t update_index)
{
struct reftable_record want = {
.type = BLOCK_TYPE_LOG,
.u.log = {
.refname = (char *)name,
.update_index = update_index,
},
};
return it->ops->seek(it->iter_arg, &want);
}
int reftable_iterator_seek_log(struct reftable_iterator *it,
const char *name)
{
return reftable_iterator_seek_log_at(it, name, ~((uint64_t) 0));
}
int reftable_table_read_ref(struct reftable_table *tab, const char *name,
struct reftable_ref_record *ref)
{
struct reftable_iterator it = { NULL };
int err;
reftable_table_init_ref_iter(tab, &it);
err = reftable_iterator_seek_ref(&it, name);
if (err)
goto done;
err = reftable_iterator_next_ref(&it, ref);
if (err)
goto done;
if (strcmp(ref->refname, name) ||
reftable_ref_record_is_deletion(ref)) {
reftable_ref_record_release(ref);
err = 1;
goto done;
}
done:
reftable_iterator_destroy(&it);
return err;
}
int reftable_table_print(struct reftable_table *tab) {
struct reftable_iterator it = { NULL };
struct reftable_ref_record ref = { NULL };
struct reftable_log_record log = { NULL };
uint32_t hash_id = reftable_table_hash_id(tab);
int err;
reftable_table_init_ref_iter(tab, &it);
err = reftable_iterator_seek_ref(&it, "");
if (err < 0)
return err;
while (1) {
err = reftable_iterator_next_ref(&it, &ref);
if (err > 0) {
break;
}
if (err < 0) {
return err;
}
reftable_ref_record_print(&ref, hash_id);
}
reftable_iterator_destroy(&it);
reftable_ref_record_release(&ref);
reftable_table_init_log_iter(tab, &it);
err = reftable_iterator_seek_log(&it, "");
if (err < 0)
return err;
while (1) {
err = reftable_iterator_next_log(&it, &log);
if (err > 0) {
break;
}
if (err < 0) {
return err;
}
reftable_log_record_print(&log, hash_id);
}
reftable_iterator_destroy(&it);
reftable_log_record_release(&log);
return 0;
}
uint64_t reftable_table_max_update_index(struct reftable_table *tab)
{
return tab->ops->max_update_index(tab->table_arg);
}
uint64_t reftable_table_min_update_index(struct reftable_table *tab)
{
return tab->ops->min_update_index(tab->table_arg);
}
uint32_t reftable_table_hash_id(struct reftable_table *tab)
{
return tab->ops->hash_id(tab->table_arg);
}
void reftable_iterator_destroy(struct reftable_iterator *it)
{
if (!it->ops) {
return;
}
it->ops->close(it->iter_arg);
it->ops = NULL;
FREE_AND_NULL(it->iter_arg);
}
int reftable_iterator_next_ref(struct reftable_iterator *it,
struct reftable_ref_record *ref)
{
struct reftable_record rec = {
.type = BLOCK_TYPE_REF,
.u = {
.ref = *ref
},
};
int err = iterator_next(it, &rec);
*ref = rec.u.ref;
return err;
}
int reftable_iterator_next_log(struct reftable_iterator *it,
struct reftable_log_record *log)
{
struct reftable_record rec = {
.type = BLOCK_TYPE_LOG,
.u = {
.log = *log,
},
};
int err = iterator_next(it, &rec);
*log = rec.u.log;
return err;
}
int iterator_seek(struct reftable_iterator *it, struct reftable_record *want)
{
return it->ops->seek(it->iter_arg, want);
}
int iterator_next(struct reftable_iterator *it, struct reftable_record *rec)
{
return it->ops->next(it->iter_arg, rec);
}
static int empty_iterator_seek(void *arg, struct reftable_record *want)
{
return 0;
}
static int empty_iterator_next(void *arg, struct reftable_record *rec)
{
return 1;
}
static void empty_iterator_close(void *arg)
{
}
static struct reftable_iterator_vtable empty_vtable = {
.seek = &empty_iterator_seek,
.next = &empty_iterator_next,
.close = &empty_iterator_close,
};
void iterator_set_empty(struct reftable_iterator *it)
{
assert(!it->ops);
it->iter_arg = NULL;
it->ops = &empty_vtable;
}
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