reftable/reader: make table iterator reseekable

In 67ce50b (Merge branch 'ps/reftable-reusable-iterator', 2024-05-30)
we have refactored the interface of reftable iterators such that they
can be reused in theory. This patch series only landed the required
changes on the interface level, but didn't yet implement the actual
logic to make iterators reusable.

As it turns out almost all of the infrastructure already does support
re-seeking. The only exception is the table iterator, which does not
reset its `is_finished` bit. Do so and add a couple of tests that verify
that we can re-seek iterators.

Signed-off-by: Patrick Steinhardt <[email protected]>
Signed-off-by: Junio C Hamano <[email protected]>

Makefile

@@ -1346,6 +1346,7 @@ UNIT_TEST_PROGRAMS += t-reftable-basics
 UNIT_TEST_PROGRAMS += t-reftable-block
 UNIT_TEST_PROGRAMS += t-reftable-merged
 UNIT_TEST_PROGRAMS += t-reftable-pq
+UNIT_TEST_PROGRAMS += t-reftable-reader
 UNIT_TEST_PROGRAMS += t-reftable-readwrite
 UNIT_TEST_PROGRAMS += t-reftable-record
 UNIT_TEST_PROGRAMS += t-reftable-stack

reftable/reader.c

@@ -328,6 +328,7 @@ static int table_iter_seek_to(struct table_iter *ti, uint64_t off, uint8_t typ)
 	ti->typ = block_reader_type(&ti->br);
 	ti->block_off = off;
 	block_iter_seek_start(&ti->bi, &ti->br);
+	ti->is_finished = 0;
 	return 0;
 }
 

t/unit-tests/t-reftable-merged.c

@@ -194,6 +194,81 @@ static void t_merged_refs(void)
 	reftable_free(bs);
 }
 
+static void t_merged_seek_multiple_times(void)
+{
+	struct reftable_ref_record r1[] = {
+		{
+			.refname = (char *) "a",
+			.update_index = 1,
+			.value_type = REFTABLE_REF_VAL1,
+			.value.val1 = { 1 },
+		},
+		{
+			.refname = (char *) "c",
+			.update_index = 1,
+			.value_type = REFTABLE_REF_VAL1,
+			.value.val1 = { 2 },
+		}
+	};
+	struct reftable_ref_record r2[] = {
+		{
+			.refname = (char *) "b",
+			.update_index = 2,
+			.value_type = REFTABLE_REF_VAL1,
+			.value.val1 = { 3 },
+		},
+		{
+			.refname = (char *) "d",
+			.update_index = 2,
+			.value_type = REFTABLE_REF_VAL1,
+			.value.val1 = { 4 },
+		},
+	};
+	struct reftable_ref_record *refs[] = {
+		r1, r2,
+	};
+	size_t sizes[] = {
+		ARRAY_SIZE(r1), ARRAY_SIZE(r2),
+	};
+	struct strbuf bufs[] = {
+		STRBUF_INIT, STRBUF_INIT,
+	};
+	struct reftable_block_source *sources = NULL;
+	struct reftable_reader **readers = NULL;
+	struct reftable_ref_record rec = { 0 };
+	struct reftable_iterator it = { 0 };
+	struct reftable_merged_table *mt;
+
+	mt = merged_table_from_records(refs, &sources, &readers, sizes, bufs, 2);
+	merged_table_init_iter(mt, &it, BLOCK_TYPE_REF);
+
+	for (size_t i = 0; i < 5; i++) {
+		int err = reftable_iterator_seek_ref(&it, "c");
+		check(!err);
+
+		err = reftable_iterator_next_ref(&it, &rec);
+		check(!err);
+		err = reftable_ref_record_equal(&rec, &r1[1], GIT_SHA1_RAWSZ);
+		check(err == 1);
+
+		err = reftable_iterator_next_ref(&it, &rec);
+		check(!err);
+		err = reftable_ref_record_equal(&rec, &r2[1], GIT_SHA1_RAWSZ);
+		check(err == 1);
+
+		err = reftable_iterator_next_ref(&it, &rec);
+		check(err > 0);
+	}
+
+	for (size_t i = 0; i < ARRAY_SIZE(bufs); i++)
+		strbuf_release(&bufs[i]);
+	readers_destroy(readers, ARRAY_SIZE(refs));
+	reftable_ref_record_release(&rec);
+	reftable_iterator_destroy(&it);
+	reftable_merged_table_free(mt);
+	reftable_free(sources);
+}
+
 static struct reftable_merged_table *
 merged_table_from_log_records(struct reftable_log_record **logs,
 			      struct reftable_block_source **source,
@@ -383,6 +458,7 @@ int cmd_main(int argc UNUSED, const char *argv[] UNUSED)
 	TEST(t_default_write_opts(), "merged table with default write opts");
 	TEST(t_merged_logs(), "merged table with multiple log updates for same ref");
 	TEST(t_merged_refs(), "merged table with multiple updates to same ref");
+	TEST(t_merged_seek_multiple_times(), "merged table can seek multiple times");
 	TEST(t_merged_single_record(), "ref ocurring in only one record can be fetched");
 
 	return test_done();

t/unit-tests/t-reftable-reader.c

@@ -0,0 +1,96 @@
+#include "test-lib.h"
+#include "lib-reftable.h"
+#include "reftable/blocksource.h"
+#include "reftable/reader.h"
+
+static int t_reader_seek_once(void)
+{
+	struct reftable_ref_record records[] = {
+		{
+			.refname = (char *) "refs/heads/main",
+			.value_type = REFTABLE_REF_VAL1,
+			.value.val1 = { 42 },
+		},
+	};
+	struct reftable_block_source source = { 0 };
+	struct reftable_ref_record ref = { 0 };
+	struct reftable_iterator it = { 0 };
+	struct reftable_reader *reader;
+	struct strbuf buf = STRBUF_INIT;
+	int ret;
+
+	t_reftable_write_to_buf(&buf, records, ARRAY_SIZE(records), NULL, 0, NULL);
+	block_source_from_strbuf(&source, &buf);
+
+	ret = reftable_reader_new(&reader, &source, "name");
+	check(!ret);
+
+	reftable_reader_init_ref_iterator(reader, &it);
+	ret = reftable_iterator_seek_ref(&it, "");
+	check(!ret);
+	ret = reftable_iterator_next_ref(&it, &ref);
+	check(!ret);
+
+	ret = reftable_ref_record_equal(&ref, &records[0], GIT_SHA1_RAWSZ);
+	check_int(ret, ==, 1);
+
+	ret = reftable_iterator_next_ref(&it, &ref);
+	check_int(ret, ==, 1);
+
+	reftable_ref_record_release(&ref);
+	reftable_iterator_destroy(&it);
+	reftable_reader_decref(reader);
+	strbuf_release(&buf);
+	return 0;
+}
+
+static int t_reader_reseek(void)
+{
+	struct reftable_ref_record records[] = {
+		{
+			.refname = (char *) "refs/heads/main",
+			.value_type = REFTABLE_REF_VAL1,
+			.value.val1 = { 42 },
+		},
+	};
+	struct reftable_block_source source = { 0 };
+	struct reftable_ref_record ref = { 0 };
+	struct reftable_iterator it = { 0 };
+	struct reftable_reader *reader;
+	struct strbuf buf = STRBUF_INIT;
+	int ret;
+
+	t_reftable_write_to_buf(&buf, records, ARRAY_SIZE(records), NULL, 0, NULL);
+	block_source_from_strbuf(&source, &buf);
+
+	ret = reftable_reader_new(&reader, &source, "name");
+	check(!ret);
+
+	reftable_reader_init_ref_iterator(reader, &it);
+
+	for (size_t i = 0; i < 5; i++) {
+		ret = reftable_iterator_seek_ref(&it, "");
+		check(!ret);
+		ret = reftable_iterator_next_ref(&it, &ref);
+		check(!ret);
+
+		ret = reftable_ref_record_equal(&ref, &records[0], GIT_SHA1_RAWSZ);
+		check_int(ret, ==, 1);
+
+		ret = reftable_iterator_next_ref(&it, &ref);
+		check_int(ret, ==, 1);
+	}
+
+	reftable_ref_record_release(&ref);
+	reftable_iterator_destroy(&it);
+	reftable_reader_decref(reader);
+	strbuf_release(&buf);
+	return 0;
+}
+
+int cmd_main(int argc UNUSED, const char *argv[] UNUSED)
+{
+	TEST(t_reader_seek_once(), "reader can seek once");
+	TEST(t_reader_reseek(), "reader can reseek multiple times");
+	return test_done();
+}