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reftable: add merged table view
This adds an abstract, read-only interface to the ref database. This primitive is used to construct the read view of the ref database (the read view is constructed by merging several *.ref files). It also provides the mechanism to provide a unified view of the refs in the main repository and the per-worktree refs. Signed-off-by: Han-Wen Nienhuys <hanwen@google.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Han-Wen Nienhuys
Junio C Hamano
parent
3b34f636df
commit
1ae2b8cda8
2
Makefile
2
Makefile
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@ -2462,6 +2462,7 @@ REFTABLE_OBJS += reftable/block.o
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REFTABLE_OBJS += reftable/blocksource.o
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REFTABLE_OBJS += reftable/iter.o
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REFTABLE_OBJS += reftable/publicbasics.o
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REFTABLE_OBJS += reftable/merged.o
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REFTABLE_OBJS += reftable/pq.o
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REFTABLE_OBJS += reftable/reader.o
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REFTABLE_OBJS += reftable/record.o
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@ -2473,6 +2474,7 @@ REFTABLE_OBJS += reftable/writer.o
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REFTABLE_TEST_OBJS += reftable/basics_test.o
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REFTABLE_TEST_OBJS += reftable/block_test.o
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REFTABLE_TEST_OBJS += reftable/merged_test.o
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REFTABLE_TEST_OBJS += reftable/pq_test.o
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REFTABLE_TEST_OBJS += reftable/record_test.o
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REFTABLE_TEST_OBJS += reftable/readwrite_test.o
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@ -0,0 +1,362 @@
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/*
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Copyright 2020 Google LLC
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Use of this source code is governed by a BSD-style
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license that can be found in the LICENSE file or at
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https://developers.google.com/open-source/licenses/bsd
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*/
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#include "merged.h"
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#include "constants.h"
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#include "iter.h"
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#include "pq.h"
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#include "reader.h"
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#include "record.h"
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#include "generic.h"
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#include "reftable-merged.h"
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#include "reftable-error.h"
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#include "system.h"
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static int merged_iter_init(struct merged_iter *mi)
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{
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int i = 0;
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for (i = 0; i < mi->stack_len; i++) {
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struct reftable_record rec = reftable_new_record(mi->typ);
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int err = iterator_next(&mi->stack[i], &rec);
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if (err < 0) {
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return err;
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}
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if (err > 0) {
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reftable_iterator_destroy(&mi->stack[i]);
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reftable_record_destroy(&rec);
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} else {
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struct pq_entry e = {
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.rec = rec,
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.index = i,
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};
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merged_iter_pqueue_add(&mi->pq, e);
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}
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}
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return 0;
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}
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static void merged_iter_close(void *p)
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{
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struct merged_iter *mi = p;
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int i = 0;
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merged_iter_pqueue_release(&mi->pq);
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for (i = 0; i < mi->stack_len; i++) {
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reftable_iterator_destroy(&mi->stack[i]);
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}
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reftable_free(mi->stack);
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}
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static int merged_iter_advance_nonnull_subiter(struct merged_iter *mi,
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size_t idx)
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{
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struct reftable_record rec = reftable_new_record(mi->typ);
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struct pq_entry e = {
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.rec = rec,
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.index = idx,
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};
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int err = iterator_next(&mi->stack[idx], &rec);
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if (err < 0)
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return err;
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if (err > 0) {
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reftable_iterator_destroy(&mi->stack[idx]);
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reftable_record_destroy(&rec);
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return 0;
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}
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merged_iter_pqueue_add(&mi->pq, e);
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return 0;
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}
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static int merged_iter_advance_subiter(struct merged_iter *mi, size_t idx)
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{
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if (iterator_is_null(&mi->stack[idx]))
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return 0;
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return merged_iter_advance_nonnull_subiter(mi, idx);
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}
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static int merged_iter_next_entry(struct merged_iter *mi,
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struct reftable_record *rec)
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{
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struct strbuf entry_key = STRBUF_INIT;
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struct pq_entry entry = { 0 };
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int err = 0;
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if (merged_iter_pqueue_is_empty(mi->pq))
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return 1;
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entry = merged_iter_pqueue_remove(&mi->pq);
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err = merged_iter_advance_subiter(mi, entry.index);
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if (err < 0)
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return err;
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/*
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One can also use reftable as datacenter-local storage, where the ref
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database is maintained in globally consistent database (eg.
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CockroachDB or Spanner). In this scenario, replication delays together
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with compaction may cause newer tables to contain older entries. In
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such a deployment, the loop below must be changed to collect all
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entries for the same key, and return new the newest one.
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*/
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reftable_record_key(&entry.rec, &entry_key);
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while (!merged_iter_pqueue_is_empty(mi->pq)) {
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struct pq_entry top = merged_iter_pqueue_top(mi->pq);
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struct strbuf k = STRBUF_INIT;
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int err = 0, cmp = 0;
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reftable_record_key(&top.rec, &k);
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cmp = strbuf_cmp(&k, &entry_key);
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strbuf_release(&k);
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if (cmp > 0) {
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break;
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}
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merged_iter_pqueue_remove(&mi->pq);
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err = merged_iter_advance_subiter(mi, top.index);
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if (err < 0) {
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return err;
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}
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reftable_record_destroy(&top.rec);
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}
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reftable_record_copy_from(rec, &entry.rec, hash_size(mi->hash_id));
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reftable_record_destroy(&entry.rec);
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strbuf_release(&entry_key);
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return 0;
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}
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static int merged_iter_next(struct merged_iter *mi, struct reftable_record *rec)
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{
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while (1) {
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int err = merged_iter_next_entry(mi, rec);
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if (err == 0 && mi->suppress_deletions &&
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reftable_record_is_deletion(rec)) {
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continue;
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}
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return err;
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}
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}
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static int merged_iter_next_void(void *p, struct reftable_record *rec)
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{
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struct merged_iter *mi = p;
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if (merged_iter_pqueue_is_empty(mi->pq))
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return 1;
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return merged_iter_next(mi, rec);
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}
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static struct reftable_iterator_vtable merged_iter_vtable = {
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.next = &merged_iter_next_void,
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.close = &merged_iter_close,
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};
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static void iterator_from_merged_iter(struct reftable_iterator *it,
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struct merged_iter *mi)
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{
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assert(!it->ops);
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it->iter_arg = mi;
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it->ops = &merged_iter_vtable;
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}
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int reftable_new_merged_table(struct reftable_merged_table **dest,
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struct reftable_table *stack, int n,
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uint32_t hash_id)
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{
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struct reftable_merged_table *m = NULL;
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uint64_t last_max = 0;
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uint64_t first_min = 0;
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int i = 0;
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for (i = 0; i < n; i++) {
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uint64_t min = reftable_table_min_update_index(&stack[i]);
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uint64_t max = reftable_table_max_update_index(&stack[i]);
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if (reftable_table_hash_id(&stack[i]) != hash_id) {
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return REFTABLE_FORMAT_ERROR;
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}
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if (i == 0 || min < first_min) {
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first_min = min;
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}
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if (i == 0 || max > last_max) {
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last_max = max;
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}
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}
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m = reftable_calloc(sizeof(struct reftable_merged_table));
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m->stack = stack;
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m->stack_len = n;
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m->min = first_min;
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m->max = last_max;
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m->hash_id = hash_id;
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*dest = m;
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return 0;
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}
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/* clears the list of subtable, without affecting the readers themselves. */
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void merged_table_release(struct reftable_merged_table *mt)
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{
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FREE_AND_NULL(mt->stack);
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mt->stack_len = 0;
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}
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void reftable_merged_table_free(struct reftable_merged_table *mt)
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{
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if (!mt) {
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return;
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}
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merged_table_release(mt);
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reftable_free(mt);
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}
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uint64_t
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reftable_merged_table_max_update_index(struct reftable_merged_table *mt)
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{
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return mt->max;
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}
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uint64_t
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reftable_merged_table_min_update_index(struct reftable_merged_table *mt)
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{
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return mt->min;
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}
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static int reftable_table_seek_record(struct reftable_table *tab,
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struct reftable_iterator *it,
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struct reftable_record *rec)
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{
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return tab->ops->seek_record(tab->table_arg, it, rec);
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}
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static int merged_table_seek_record(struct reftable_merged_table *mt,
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struct reftable_iterator *it,
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struct reftable_record *rec)
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{
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struct reftable_iterator *iters = reftable_calloc(
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sizeof(struct reftable_iterator) * mt->stack_len);
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struct merged_iter merged = {
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.stack = iters,
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.typ = reftable_record_type(rec),
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.hash_id = mt->hash_id,
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.suppress_deletions = mt->suppress_deletions,
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};
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int n = 0;
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int err = 0;
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int i = 0;
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for (i = 0; i < mt->stack_len && err == 0; i++) {
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int e = reftable_table_seek_record(&mt->stack[i], &iters[n],
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rec);
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if (e < 0) {
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err = e;
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}
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if (e == 0) {
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n++;
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}
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}
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if (err < 0) {
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int i = 0;
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for (i = 0; i < n; i++) {
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reftable_iterator_destroy(&iters[i]);
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}
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reftable_free(iters);
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return err;
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}
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merged.stack_len = n;
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err = merged_iter_init(&merged);
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if (err < 0) {
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merged_iter_close(&merged);
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return err;
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} else {
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struct merged_iter *p =
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reftable_malloc(sizeof(struct merged_iter));
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*p = merged;
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iterator_from_merged_iter(it, p);
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}
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return 0;
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}
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int reftable_merged_table_seek_ref(struct reftable_merged_table *mt,
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struct reftable_iterator *it,
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const char *name)
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{
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struct reftable_ref_record ref = {
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.refname = (char *)name,
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};
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struct reftable_record rec = { NULL };
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reftable_record_from_ref(&rec, &ref);
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return merged_table_seek_record(mt, it, &rec);
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}
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int reftable_merged_table_seek_log_at(struct reftable_merged_table *mt,
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struct reftable_iterator *it,
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const char *name, uint64_t update_index)
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{
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struct reftable_log_record log = {
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.refname = (char *)name,
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.update_index = update_index,
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};
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struct reftable_record rec = { NULL };
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reftable_record_from_log(&rec, &log);
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return merged_table_seek_record(mt, it, &rec);
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}
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int reftable_merged_table_seek_log(struct reftable_merged_table *mt,
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struct reftable_iterator *it,
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const char *name)
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{
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uint64_t max = ~((uint64_t)0);
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return reftable_merged_table_seek_log_at(mt, it, name, max);
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}
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uint32_t reftable_merged_table_hash_id(struct reftable_merged_table *mt)
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{
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return mt->hash_id;
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}
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static int reftable_merged_table_seek_void(void *tab,
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struct reftable_iterator *it,
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struct reftable_record *rec)
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{
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return merged_table_seek_record(tab, it, rec);
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}
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static uint32_t reftable_merged_table_hash_id_void(void *tab)
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{
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return reftable_merged_table_hash_id(tab);
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}
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static uint64_t reftable_merged_table_min_update_index_void(void *tab)
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{
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return reftable_merged_table_min_update_index(tab);
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}
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static uint64_t reftable_merged_table_max_update_index_void(void *tab)
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{
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return reftable_merged_table_max_update_index(tab);
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}
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static struct reftable_table_vtable merged_table_vtable = {
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.seek_record = reftable_merged_table_seek_void,
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.hash_id = reftable_merged_table_hash_id_void,
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.min_update_index = reftable_merged_table_min_update_index_void,
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.max_update_index = reftable_merged_table_max_update_index_void,
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};
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void reftable_table_from_merged_table(struct reftable_table *tab,
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struct reftable_merged_table *merged)
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{
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assert(!tab->ops);
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tab->ops = &merged_table_vtable;
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tab->table_arg = merged;
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}
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@ -0,0 +1,38 @@
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/*
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Copyright 2020 Google LLC
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Use of this source code is governed by a BSD-style
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license that can be found in the LICENSE file or at
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https://developers.google.com/open-source/licenses/bsd
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*/
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#ifndef MERGED_H
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#define MERGED_H
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#include "pq.h"
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struct reftable_merged_table {
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struct reftable_table *stack;
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size_t stack_len;
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uint32_t hash_id;
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/* If unset, produce deletions. This is useful for compaction. For the
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* full stack, deletions should be produced. */
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int suppress_deletions;
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uint64_t min;
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uint64_t max;
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};
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struct merged_iter {
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struct reftable_iterator *stack;
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uint32_t hash_id;
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size_t stack_len;
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uint8_t typ;
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int suppress_deletions;
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struct merged_iter_pqueue pq;
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};
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void merged_table_release(struct reftable_merged_table *mt);
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#endif
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@ -0,0 +1,468 @@
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/*
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Copyright 2020 Google LLC
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Use of this source code is governed by a BSD-style
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license that can be found in the LICENSE file or at
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https://developers.google.com/open-source/licenses/bsd
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*/
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#include "merged.h"
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#include "system.h"
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#include "basics.h"
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#include "blocksource.h"
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#include "constants.h"
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#include "reader.h"
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#include "record.h"
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#include "test_framework.h"
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#include "reftable-merged.h"
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#include "reftable-tests.h"
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#include "reftable-generic.h"
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#include "reftable-writer.h"
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static void write_test_table(struct strbuf *buf,
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struct reftable_ref_record refs[], int n)
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{
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int min = 0xffffffff;
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int max = 0;
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int i = 0;
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int err;
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struct reftable_write_options opts = {
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.block_size = 256,
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};
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struct reftable_writer *w = NULL;
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for (i = 0; i < n; i++) {
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uint64_t ui = refs[i].update_index;
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if (ui > max) {
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max = ui;
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}
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if (ui < min) {
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min = ui;
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}
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}
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w = reftable_new_writer(&strbuf_add_void, buf, &opts);
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reftable_writer_set_limits(w, min, max);
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for (i = 0; i < n; i++) {
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uint64_t before = refs[i].update_index;
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int n = reftable_writer_add_ref(w, &refs[i]);
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EXPECT(n == 0);
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EXPECT(before == refs[i].update_index);
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}
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err = reftable_writer_close(w);
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EXPECT_ERR(err);
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reftable_writer_free(w);
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}
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||||
static void write_test_log_table(struct strbuf *buf,
|
||||
struct reftable_log_record logs[], int n,
|
||||
uint64_t update_index)
|
||||
{
|
||||
int i = 0;
|
||||
int err;
|
||||
|
||||
struct reftable_write_options opts = {
|
||||
.block_size = 256,
|
||||
.exact_log_message = 1,
|
||||
};
|
||||
struct reftable_writer *w = NULL;
|
||||
w = reftable_new_writer(&strbuf_add_void, buf, &opts);
|
||||
reftable_writer_set_limits(w, update_index, update_index);
|
||||
|
||||
for (i = 0; i < n; i++) {
|
||||
int err = reftable_writer_add_log(w, &logs[i]);
|
||||
EXPECT_ERR(err);
|
||||
}
|
||||
|
||||
err = reftable_writer_close(w);
|
||||
EXPECT_ERR(err);
|
||||
|
||||
reftable_writer_free(w);
|
||||
}
|
||||
|
||||
static struct reftable_merged_table *
|
||||
merged_table_from_records(struct reftable_ref_record **refs,
|
||||
struct reftable_block_source **source,
|
||||
struct reftable_reader ***readers, int *sizes,
|
||||
struct strbuf *buf, int n)
|
||||
{
|
||||
int i = 0;
|
||||
struct reftable_merged_table *mt = NULL;
|
||||
int err;
|
||||
struct reftable_table *tabs =
|
||||
reftable_calloc(n * sizeof(struct reftable_table));
|
||||
*readers = reftable_calloc(n * sizeof(struct reftable_reader *));
|
||||
*source = reftable_calloc(n * sizeof(**source));
|
||||
for (i = 0; i < n; i++) {
|
||||
write_test_table(&buf[i], refs[i], sizes[i]);
|
||||
block_source_from_strbuf(&(*source)[i], &buf[i]);
|
||||
|
||||
err = reftable_new_reader(&(*readers)[i], &(*source)[i],
|
||||
"name");
|
||||
EXPECT_ERR(err);
|
||||
reftable_table_from_reader(&tabs[i], (*readers)[i]);
|
||||
}
|
||||
|
||||
err = reftable_new_merged_table(&mt, tabs, n, GIT_SHA1_FORMAT_ID);
|
||||
EXPECT_ERR(err);
|
||||
return mt;
|
||||
}
|
||||
|
||||
static void readers_destroy(struct reftable_reader **readers, size_t n)
|
||||
{
|
||||
int i = 0;
|
||||
for (; i < n; i++)
|
||||
reftable_reader_free(readers[i]);
|
||||
reftable_free(readers);
|
||||
}
|
||||
|
||||
static void test_merged_between(void)
|
||||
{
|
||||
uint8_t hash1[GIT_SHA1_RAWSZ] = { 1, 2, 3, 0 };
|
||||
|
||||
struct reftable_ref_record r1[] = { {
|
||||
.refname = "b",
|
||||
.update_index = 1,
|
||||
.value_type = REFTABLE_REF_VAL1,
|
||||
.value.val1 = hash1,
|
||||
} };
|
||||
struct reftable_ref_record r2[] = { {
|
||||
.refname = "a",
|
||||
.update_index = 2,
|
||||
.value_type = REFTABLE_REF_DELETION,
|
||||
} };
|
||||
|
||||
struct reftable_ref_record *refs[] = { r1, r2 };
|
||||
int sizes[] = { 1, 1 };
|
||||
struct strbuf bufs[2] = { STRBUF_INIT, STRBUF_INIT };
|
||||
struct reftable_block_source *bs = NULL;
|
||||
struct reftable_reader **readers = NULL;
|
||||
struct reftable_merged_table *mt =
|
||||
merged_table_from_records(refs, &bs, &readers, sizes, bufs, 2);
|
||||
int i;
|
||||
struct reftable_ref_record ref = { NULL };
|
||||
struct reftable_iterator it = { NULL };
|
||||
int err = reftable_merged_table_seek_ref(mt, &it, "a");
|
||||
EXPECT_ERR(err);
|
||||
|
||||
err = reftable_iterator_next_ref(&it, &ref);
|
||||
EXPECT_ERR(err);
|
||||
EXPECT(ref.update_index == 2);
|
||||
reftable_ref_record_release(&ref);
|
||||
reftable_iterator_destroy(&it);
|
||||
readers_destroy(readers, 2);
|
||||
reftable_merged_table_free(mt);
|
||||
for (i = 0; i < ARRAY_SIZE(bufs); i++) {
|
||||
strbuf_release(&bufs[i]);
|
||||
}
|
||||
reftable_free(bs);
|
||||
}
|
||||
|
||||
static void test_merged(void)
|
||||
{
|
||||
uint8_t hash1[GIT_SHA1_RAWSZ] = { 1 };
|
||||
uint8_t hash2[GIT_SHA1_RAWSZ] = { 2 };
|
||||
struct reftable_ref_record r1[] = {
|
||||
{
|
||||
.refname = "a",
|
||||
.update_index = 1,
|
||||
.value_type = REFTABLE_REF_VAL1,
|
||||
.value.val1 = hash1,
|
||||
},
|
||||
{
|
||||
.refname = "b",
|
||||
.update_index = 1,
|
||||
.value_type = REFTABLE_REF_VAL1,
|
||||
.value.val1 = hash1,
|
||||
},
|
||||
{
|
||||
.refname = "c",
|
||||
.update_index = 1,
|
||||
.value_type = REFTABLE_REF_VAL1,
|
||||
.value.val1 = hash1,
|
||||
}
|
||||
};
|
||||
struct reftable_ref_record r2[] = { {
|
||||
.refname = "a",
|
||||
.update_index = 2,
|
||||
.value_type = REFTABLE_REF_DELETION,
|
||||
} };
|
||||
struct reftable_ref_record r3[] = {
|
||||
{
|
||||
.refname = "c",
|
||||
.update_index = 3,
|
||||
.value_type = REFTABLE_REF_VAL1,
|
||||
.value.val1 = hash2,
|
||||
},
|
||||
{
|
||||
.refname = "d",
|
||||
.update_index = 3,
|
||||
.value_type = REFTABLE_REF_VAL1,
|
||||
.value.val1 = hash1,
|
||||
},
|
||||
};
|
||||
|
||||
struct reftable_ref_record want[] = {
|
||||
r2[0],
|
||||
r1[1],
|
||||
r3[0],
|
||||
r3[1],
|
||||
};
|
||||
|
||||
struct reftable_ref_record *refs[] = { r1, r2, r3 };
|
||||
int sizes[3] = { 3, 1, 2 };
|
||||
struct strbuf bufs[3] = { STRBUF_INIT, STRBUF_INIT, STRBUF_INIT };
|
||||
struct reftable_block_source *bs = NULL;
|
||||
struct reftable_reader **readers = NULL;
|
||||
struct reftable_merged_table *mt =
|
||||
merged_table_from_records(refs, &bs, &readers, sizes, bufs, 3);
|
||||
|
||||
struct reftable_iterator it = { NULL };
|
||||
int err = reftable_merged_table_seek_ref(mt, &it, "a");
|
||||
struct reftable_ref_record *out = NULL;
|
||||
size_t len = 0;
|
||||
size_t cap = 0;
|
||||
int i = 0;
|
||||
|
||||
EXPECT_ERR(err);
|
||||
EXPECT(reftable_merged_table_hash_id(mt) == GIT_SHA1_FORMAT_ID);
|
||||
EXPECT(reftable_merged_table_min_update_index(mt) == 1);
|
||||
|
||||
while (len < 100) { /* cap loops/recursion. */
|
||||
struct reftable_ref_record ref = { NULL };
|
||||
int err = reftable_iterator_next_ref(&it, &ref);
|
||||
if (err > 0) {
|
||||
break;
|
||||
}
|
||||
if (len == cap) {
|
||||
cap = 2 * cap + 1;
|
||||
out = reftable_realloc(
|
||||
out, sizeof(struct reftable_ref_record) * cap);
|
||||
}
|
||||
out[len++] = ref;
|
||||
}
|
||||
reftable_iterator_destroy(&it);
|
||||
|
||||
EXPECT(ARRAY_SIZE(want) == len);
|
||||
for (i = 0; i < len; i++) {
|
||||
EXPECT(reftable_ref_record_equal(&want[i], &out[i],
|
||||
GIT_SHA1_RAWSZ));
|
||||
}
|
||||
for (i = 0; i < len; i++) {
|
||||
reftable_ref_record_release(&out[i]);
|
||||
}
|
||||
reftable_free(out);
|
||||
|
||||
for (i = 0; i < 3; i++) {
|
||||
strbuf_release(&bufs[i]);
|
||||
}
|
||||
readers_destroy(readers, 3);
|
||||
reftable_merged_table_free(mt);
|
||||
reftable_free(bs);
|
||||
}
|
||||
|
||||
static struct reftable_merged_table *
|
||||
merged_table_from_log_records(struct reftable_log_record **logs,
|
||||
struct reftable_block_source **source,
|
||||
struct reftable_reader ***readers, int *sizes,
|
||||
struct strbuf *buf, int n)
|
||||
{
|
||||
int i = 0;
|
||||
struct reftable_merged_table *mt = NULL;
|
||||
int err;
|
||||
struct reftable_table *tabs =
|
||||
reftable_calloc(n * sizeof(struct reftable_table));
|
||||
*readers = reftable_calloc(n * sizeof(struct reftable_reader *));
|
||||
*source = reftable_calloc(n * sizeof(**source));
|
||||
for (i = 0; i < n; i++) {
|
||||
write_test_log_table(&buf[i], logs[i], sizes[i], i + 1);
|
||||
block_source_from_strbuf(&(*source)[i], &buf[i]);
|
||||
|
||||
err = reftable_new_reader(&(*readers)[i], &(*source)[i],
|
||||
"name");
|
||||
EXPECT_ERR(err);
|
||||
reftable_table_from_reader(&tabs[i], (*readers)[i]);
|
||||
}
|
||||
|
||||
err = reftable_new_merged_table(&mt, tabs, n, GIT_SHA1_FORMAT_ID);
|
||||
EXPECT_ERR(err);
|
||||
return mt;
|
||||
}
|
||||
|
||||
static void test_merged_logs(void)
|
||||
{
|
||||
uint8_t hash1[GIT_SHA1_RAWSZ] = { 1 };
|
||||
uint8_t hash2[GIT_SHA1_RAWSZ] = { 2 };
|
||||
uint8_t hash3[GIT_SHA1_RAWSZ] = { 3 };
|
||||
struct reftable_log_record r1[] = {
|
||||
{
|
||||
.refname = "a",
|
||||
.update_index = 2,
|
||||
.value_type = REFTABLE_LOG_UPDATE,
|
||||
.value.update = {
|
||||
.old_hash = hash2,
|
||||
/* deletion */
|
||||
.name = "jane doe",
|
||||
.email = "jane@invalid",
|
||||
.message = "message2",
|
||||
}
|
||||
},
|
||||
{
|
||||
.refname = "a",
|
||||
.update_index = 1,
|
||||
.value_type = REFTABLE_LOG_UPDATE,
|
||||
.value.update = {
|
||||
.old_hash = hash1,
|
||||
.new_hash = hash2,
|
||||
.name = "jane doe",
|
||||
.email = "jane@invalid",
|
||||
.message = "message1",
|
||||
}
|
||||
},
|
||||
};
|
||||
struct reftable_log_record r2[] = {
|
||||
{
|
||||
.refname = "a",
|
||||
.update_index = 3,
|
||||
.value_type = REFTABLE_LOG_UPDATE,
|
||||
.value.update = {
|
||||
.new_hash = hash3,
|
||||
.name = "jane doe",
|
||||
.email = "jane@invalid",
|
||||
.message = "message3",
|
||||
}
|
||||
},
|
||||
};
|
||||
struct reftable_log_record r3[] = {
|
||||
{
|
||||
.refname = "a",
|
||||
.update_index = 2,
|
||||
.value_type = REFTABLE_LOG_DELETION,
|
||||
},
|
||||
};
|
||||
struct reftable_log_record want[] = {
|
||||
r2[0],
|
||||
r3[0],
|
||||
r1[1],
|
||||
};
|
||||
|
||||
struct reftable_log_record *logs[] = { r1, r2, r3 };
|
||||
int sizes[3] = { 2, 1, 1 };
|
||||
struct strbuf bufs[3] = { STRBUF_INIT, STRBUF_INIT, STRBUF_INIT };
|
||||
struct reftable_block_source *bs = NULL;
|
||||
struct reftable_reader **readers = NULL;
|
||||
struct reftable_merged_table *mt = merged_table_from_log_records(
|
||||
logs, &bs, &readers, sizes, bufs, 3);
|
||||
|
||||
struct reftable_iterator it = { NULL };
|
||||
int err = reftable_merged_table_seek_log(mt, &it, "a");
|
||||
struct reftable_log_record *out = NULL;
|
||||
size_t len = 0;
|
||||
size_t cap = 0;
|
||||
int i = 0;
|
||||
|
||||
EXPECT_ERR(err);
|
||||
EXPECT(reftable_merged_table_hash_id(mt) == GIT_SHA1_FORMAT_ID);
|
||||
EXPECT(reftable_merged_table_min_update_index(mt) == 1);
|
||||
|
||||
while (len < 100) { /* cap loops/recursion. */
|
||||
struct reftable_log_record log = { NULL };
|
||||
int err = reftable_iterator_next_log(&it, &log);
|
||||
if (err > 0) {
|
||||
break;
|
||||
}
|
||||
if (len == cap) {
|
||||
cap = 2 * cap + 1;
|
||||
out = reftable_realloc(
|
||||
out, sizeof(struct reftable_log_record) * cap);
|
||||
}
|
||||
out[len++] = log;
|
||||
}
|
||||
reftable_iterator_destroy(&it);
|
||||
|
||||
EXPECT(ARRAY_SIZE(want) == len);
|
||||
for (i = 0; i < len; i++) {
|
||||
EXPECT(reftable_log_record_equal(&want[i], &out[i],
|
||||
GIT_SHA1_RAWSZ));
|
||||
}
|
||||
|
||||
err = reftable_merged_table_seek_log_at(mt, &it, "a", 2);
|
||||
EXPECT_ERR(err);
|
||||
reftable_log_record_release(&out[0]);
|
||||
err = reftable_iterator_next_log(&it, &out[0]);
|
||||
EXPECT_ERR(err);
|
||||
EXPECT(reftable_log_record_equal(&out[0], &r3[0], GIT_SHA1_RAWSZ));
|
||||
reftable_iterator_destroy(&it);
|
||||
|
||||
for (i = 0; i < len; i++) {
|
||||
reftable_log_record_release(&out[i]);
|
||||
}
|
||||
reftable_free(out);
|
||||
|
||||
for (i = 0; i < 3; i++) {
|
||||
strbuf_release(&bufs[i]);
|
||||
}
|
||||
readers_destroy(readers, 3);
|
||||
reftable_merged_table_free(mt);
|
||||
reftable_free(bs);
|
||||
}
|
||||
|
||||
static void test_default_write_opts(void)
|
||||
{
|
||||
struct reftable_write_options opts = { 0 };
|
||||
struct strbuf buf = STRBUF_INIT;
|
||||
struct reftable_writer *w =
|
||||
reftable_new_writer(&strbuf_add_void, &buf, &opts);
|
||||
|
||||
struct reftable_ref_record rec = {
|
||||
.refname = "master",
|
||||
.update_index = 1,
|
||||
};
|
||||
int err;
|
||||
struct reftable_block_source source = { NULL };
|
||||
struct reftable_table *tab = reftable_calloc(sizeof(*tab) * 1);
|
||||
uint32_t hash_id;
|
||||
struct reftable_reader *rd = NULL;
|
||||
struct reftable_merged_table *merged = NULL;
|
||||
|
||||
reftable_writer_set_limits(w, 1, 1);
|
||||
|
||||
err = reftable_writer_add_ref(w, &rec);
|
||||
EXPECT_ERR(err);
|
||||
|
||||
err = reftable_writer_close(w);
|
||||
EXPECT_ERR(err);
|
||||
reftable_writer_free(w);
|
||||
|
||||
block_source_from_strbuf(&source, &buf);
|
||||
|
||||
err = reftable_new_reader(&rd, &source, "filename");
|
||||
EXPECT_ERR(err);
|
||||
|
||||
hash_id = reftable_reader_hash_id(rd);
|
||||
EXPECT(hash_id == GIT_SHA1_FORMAT_ID);
|
||||
|
||||
reftable_table_from_reader(&tab[0], rd);
|
||||
err = reftable_new_merged_table(&merged, tab, 1, GIT_SHA1_FORMAT_ID);
|
||||
EXPECT_ERR(err);
|
||||
|
||||
reftable_reader_free(rd);
|
||||
reftable_merged_table_free(merged);
|
||||
strbuf_release(&buf);
|
||||
}
|
||||
|
||||
/* XXX test refs_for(oid) */
|
||||
|
||||
int merged_test_main(int argc, const char *argv[])
|
||||
{
|
||||
RUN_TEST(test_merged_logs);
|
||||
RUN_TEST(test_merged_between);
|
||||
RUN_TEST(test_merged);
|
||||
RUN_TEST(test_default_write_opts);
|
||||
return 0;
|
||||
}
|
||||
|
|
@ -0,0 +1,72 @@
|
|||
/*
|
||||
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
|
||||
*/
|
||||
|
||||
#ifndef REFTABLE_MERGED_H
|
||||
#define REFTABLE_MERGED_H
|
||||
|
||||
#include "reftable-iterator.h"
|
||||
|
||||
/*
|
||||
* Merged tables
|
||||
*
|
||||
* A ref database kept in a sequence of table files. The merged_table presents a
|
||||
* unified view to reading (seeking, iterating) a sequence of immutable tables.
|
||||
*
|
||||
* The merged tables are on purpose kept disconnected from their actual storage
|
||||
* (eg. files on disk), because it is useful to merge tables aren't files. For
|
||||
* example, the per-workspace and global ref namespace can be implemented as a
|
||||
* merged table of two stacks of file-backed reftables.
|
||||
*/
|
||||
|
||||
/* A merged table is implements seeking/iterating over a stack of tables. */
|
||||
struct reftable_merged_table;
|
||||
|
||||
/* A generic reftable; see below. */
|
||||
struct reftable_table;
|
||||
|
||||
/* reftable_new_merged_table creates a new merged table. It takes ownership of
|
||||
the stack array.
|
||||
*/
|
||||
int reftable_new_merged_table(struct reftable_merged_table **dest,
|
||||
struct reftable_table *stack, int n,
|
||||
uint32_t hash_id);
|
||||
|
||||
/* returns an iterator positioned just before 'name' */
|
||||
int reftable_merged_table_seek_ref(struct reftable_merged_table *mt,
|
||||
struct reftable_iterator *it,
|
||||
const char *name);
|
||||
|
||||
/* returns an iterator for log entry, at given update_index */
|
||||
int reftable_merged_table_seek_log_at(struct reftable_merged_table *mt,
|
||||
struct reftable_iterator *it,
|
||||
const char *name, uint64_t update_index);
|
||||
|
||||
/* like reftable_merged_table_seek_log_at but look for the newest entry. */
|
||||
int reftable_merged_table_seek_log(struct reftable_merged_table *mt,
|
||||
struct reftable_iterator *it,
|
||||
const char *name);
|
||||
|
||||
/* returns the max update_index covered by this merged table. */
|
||||
uint64_t
|
||||
reftable_merged_table_max_update_index(struct reftable_merged_table *mt);
|
||||
|
||||
/* returns the min update_index covered by this merged table. */
|
||||
uint64_t
|
||||
reftable_merged_table_min_update_index(struct reftable_merged_table *mt);
|
||||
|
||||
/* releases memory for the merged_table */
|
||||
void reftable_merged_table_free(struct reftable_merged_table *m);
|
||||
|
||||
/* return the hash ID of the merged table. */
|
||||
uint32_t reftable_merged_table_hash_id(struct reftable_merged_table *m);
|
||||
|
||||
/* create a generic table from reftable_merged_table */
|
||||
void reftable_table_from_merged_table(struct reftable_table *tab,
|
||||
struct reftable_merged_table *table);
|
||||
|
||||
#endif
|
||||
|
|
@ -5,6 +5,7 @@ int cmd__reftable(int argc, const char **argv)
|
|||
{
|
||||
basics_test_main(argc, argv);
|
||||
block_test_main(argc, argv);
|
||||
merged_test_main(argc, argv);
|
||||
pq_test_main(argc, argv);
|
||||
record_test_main(argc, argv);
|
||||
readwrite_test_main(argc, argv);
|
||||
|
|
|
|||
Loading…
Reference in New Issue