[Tarantool-patches] [PATCH 10/14] WIP: module api: add box_key_def_dump_parts()
Alexander Turenko
alexander.turenko at tarantool.org
Wed Sep 23 04:14:15 MSK 2020
The function dumps an opacue <box_key_def_t> structure into a non-opacue
array of <box_key_part_def_t> structures in order to allow an external
module to obtain information about the key definition.
XXX: Add a module API test.
Part of #5273
---
src/box/key_def_api.c | 64 +++++++++++++++++++++++++++++++++++++++++++
src/box/key_def_api.h | 10 +++++++
src/exports.h | 1 +
3 files changed, 75 insertions(+)
diff --git a/src/box/key_def_api.c b/src/box/key_def_api.c
index 19590095d..25dd416aa 100644
--- a/src/box/key_def_api.c
+++ b/src/box/key_def_api.c
@@ -205,6 +205,70 @@ box_key_def_delete(box_key_def_t *key_def)
key_def_delete(key_def);
}
+box_key_part_def_t *
+box_key_def_dump_parts(const box_key_def_t *key_def, uint32_t *part_count_ptr)
+{
+ struct region *region = &fiber()->gc;
+ size_t region_svp = region_used(region);
+ size_t size;
+ box_key_part_def_t *parts = region_alloc_array(
+ region, typeof(parts[0]), key_def->part_count, &size);
+ if (parts == NULL) {
+ diag_set(OutOfMemory, size, "region_alloc_array", "parts");
+ return NULL;
+ }
+
+ for (uint32_t i = 0; i < key_def->part_count; i++) {
+ const struct key_part *part = &key_def->parts[i];
+ box_key_part_def_t *part_def = &parts[i];
+ box_key_part_def_create(part_def);
+
+ /* Set part->{fieldno,flags,field_type}. */
+ part_def->fieldno = part->fieldno;
+ part_def->flags = 0;
+ if (key_part_is_nullable(part))
+ part_def->flags |= BOX_KEY_PART_DEF_IS_NULLABLE_MASK;
+ assert(part->type >= 0 && part->type < field_type_MAX);
+ part_def->field_type = field_type_strs[part->type];
+
+ /* Set part->collation. */
+ if (part->coll_id != COLL_NONE) {
+ struct coll_id *coll_id = coll_by_id(part->coll_id);
+ /*
+ * A collation may be removed after
+ * key_def creation.
+ */
+ if (coll_id == NULL) {
+ diag_set(CollationError,
+ "key_def holds dead collation id %d",
+ part->coll_id);
+ region_truncate(region, region_svp);
+ return NULL;
+ }
+ part_def->collation = coll_id->name;
+ }
+
+ /* Set part->path. */
+ if (part->path != NULL) {
+ char *path = region_alloc(region, part->path_len + 1);
+ if (path == NULL) {
+ diag_set(OutOfMemory, part->path_len + 1,
+ "region", "part_def->path");
+ region_truncate(region, region_svp);
+ return NULL;
+ }
+ memcpy(path, part->path, part->path_len);
+ path[part->path_len] = '\0';
+ part_def->path = path;
+ }
+ }
+
+ if (part_count_ptr != NULL)
+ *part_count_ptr = key_def->part_count;
+
+ return parts;
+}
+
int
box_tuple_compare(box_tuple_t *tuple_a, box_tuple_t *tuple_b,
box_key_def_t *key_def)
diff --git a/src/box/key_def_api.h b/src/box/key_def_api.h
index 328a58c70..f78203a3a 100644
--- a/src/box/key_def_api.h
+++ b/src/box/key_def_api.h
@@ -180,6 +180,16 @@ box_key_def_new_ex(box_key_part_def_t *parts, uint32_t part_count);
API_EXPORT void
box_key_def_delete(box_key_def_t *key_def);
+/**
+ * Dump key part definitions of given key_def.
+ *
+ * The function allocates key parts and storage for pointer fields
+ * (e.g. JSON paths) on the box region.
+ * @sa <box_region_truncate>().
+ */
+API_EXPORT box_key_part_def_t *
+box_key_def_dump_parts(const box_key_def_t *key_def, uint32_t *part_count_ptr);
+
/**
* Compare tuples using the key definition.
* @param tuple_a first tuple
diff --git a/src/exports.h b/src/exports.h
index 80dd952c7..ff03cfa68 100644
--- a/src/exports.h
+++ b/src/exports.h
@@ -30,6 +30,7 @@ EXPORT(box_insert)
EXPORT(box_iterator_free)
EXPORT(box_iterator_next)
EXPORT(box_key_def_delete)
+EXPORT(box_key_def_dump_parts)
EXPORT(box_key_def_new)
EXPORT(box_key_def_new_ex)
EXPORT(box_key_part_def_create)
--
2.25.0
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