git/reftable/merged_test.c
Han-Wen Nienhuys 1ae2b8cda8 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>
2021-10-08 10:45:48 -07:00

469 lines
11 KiB
C

/*
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 "merged.h"
#include "system.h"
#include "basics.h"
#include "blocksource.h"
#include "constants.h"
#include "reader.h"
#include "record.h"
#include "test_framework.h"
#include "reftable-merged.h"
#include "reftable-tests.h"
#include "reftable-generic.h"
#include "reftable-writer.h"
static void write_test_table(struct strbuf *buf,
struct reftable_ref_record refs[], int n)
{
int min = 0xffffffff;
int max = 0;
int i = 0;
int err;
struct reftable_write_options opts = {
.block_size = 256,
};
struct reftable_writer *w = NULL;
for (i = 0; i < n; i++) {
uint64_t ui = refs[i].update_index;
if (ui > max) {
max = ui;
}
if (ui < min) {
min = ui;
}
}
w = reftable_new_writer(&strbuf_add_void, buf, &opts);
reftable_writer_set_limits(w, min, max);
for (i = 0; i < n; i++) {
uint64_t before = refs[i].update_index;
int n = reftable_writer_add_ref(w, &refs[i]);
EXPECT(n == 0);
EXPECT(before == refs[i].update_index);
}
err = reftable_writer_close(w);
EXPECT_ERR(err);
reftable_writer_free(w);
}
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;
}