slbotbm commented on code in PR #4180:
URL: https://github.com/apache/iggy/pull/4180#discussion_r4064728794
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foreign/cpp/include/iggy.hpp:
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@@ -1985,6 +2423,195 @@ class IggyBlockingClient final {
*/
void DeletePartitions(const Identifier &stream, const Identifier &topic,
std::uint32_t partitions_count);
+ /**
+ * @brief Creates a consumer group for a topic.
+ *
+ * The group name must be unique within the topic, non-empty, and no more
+ * than 255 UTF-8 bytes. The new group initially has no members.
+ *
+ * The VSR server assigns consumer group IDs monotonically. Deleting a
+ * group and recreating it with the same name is allowed, but the recreated
+ * group receives a new ID rather than reusing the deleted group's ID.
+ *
+ * @param stream Parent stream, addressed by numeric ID or name.
+ * @param topic Parent topic, addressed by numeric ID or name.
+ * @param name Unique consumer group name within @p topic.
+ * @return Details of the newly created consumer group.
+ * @throws IggyException if the client is unavailable or unauthenticated;
+ * an identifier or the name is invalid; the stream or topic does
+ * not exist; the name is already in use; the caller lacks
+ * stream- or topic-management permission; or the request fails.
+ */
+ ConsumerGroupDetails CreateConsumerGroup(const Identifier &stream, const
Identifier &topic, std::string name);
+
+ /**
+ * @brief Retrieves one consumer group and its current members.
+ *
+ * The returned details are a snapshot. Membership and partition
+ * assignments can change immediately after this call returns.
+ *
+ * @param stream Parent stream, addressed by numeric ID or name.
+ * @param topic Parent topic, addressed by numeric ID or name.
+ * @param group Consumer group to retrieve, addressed by numeric ID or
name.
+ * @return Consumer group metadata and member details.
+ * @throws IggyException if the client is unavailable or unauthenticated;
+ * an identifier is invalid; the stream, topic, or consumer group
+ * does not exist; the caller lacks read permission; or the
+ * metadata read fails.
+ */
+ ConsumerGroupDetails GetConsumerGroup(const Identifier &stream, const
Identifier &topic, const Identifier &group);
+
+ /**
+ * @brief Lists consumer group summaries for a topic.
+ *
+ * The summaries include member and partition counts but omit individual
+ * member details. Use GetConsumerGroup() to retrieve those details.
+ *
+ * The VSR server reports a missing parent stream or topic as an error.
This
+ * differs from the legacy server, which returned an empty list, so an
empty
+ * result does not establish whether the parent resources exist across
+ * server implementations.
+ *
+ * @param stream Parent stream, addressed by numeric ID or name.
+ * @param topic Parent topic, addressed by numeric ID or name.
+ * @return Consumer group summaries for the requested topic.
+ * @throws IggyException if the client is unavailable or unauthenticated;
+ * an identifier is invalid; the stream or topic does not exist;
+ * the caller lacks read permission; or the metadata read fails.
+ */
+ std::vector<ConsumerGroup> GetConsumerGroups(const Identifier &stream,
const Identifier &topic);
+
+ /**
+ * @brief Deletes a consumer group from a topic.
+ *
+ * A failed or unknown transport outcome can leave the deletion committed.
+ * Query the topic's consumer groups before retrying this request.
+ *
+ * @param stream Parent stream, addressed by numeric ID or name.
+ * @param topic Parent topic, addressed by numeric ID or name.
+ * @param group Consumer group to delete, addressed by numeric ID or name.
+ * @throws IggyException if the client is unavailable or unauthenticated;
+ * an identifier is invalid; the stream, topic, or consumer group
+ * does not exist; the caller lacks stream- or topic-management
+ * permission; or the request fails.
+ */
+ void DeleteConsumerGroup(const Identifier &stream, const Identifier
&topic, const Identifier &group);
+
+ /**
+ * @brief Joins the current client to a consumer group.
+ *
+ * The server assigns topic partitions among the group's members. Joining
+ * the same group again does not add a second membership for this client.
+ * Joining consumer groups over HTTP is not supported.
+ *
+ * @param stream Parent stream, addressed by numeric ID or name.
+ * @param topic Parent topic, addressed by numeric ID or name.
+ * @param group Consumer group to join, addressed by numeric ID or name.
+ * @throws IggyException if the client is unavailable or unauthenticated;
+ * an identifier is invalid; the stream, topic, or consumer group
+ * does not exist; the caller lacks read permission; the transport
+ * does not support group membership; or the request fails.
+ */
+ void JoinConsumerGroup(const Identifier &stream, const Identifier &topic,
const Identifier &group);
+
+ /**
+ * @brief Removes the current client from a consumer group.
+ *
+ * The server reassigns partitions among the remaining group members.
+ * The client must currently belong to the group; leaving twice or leaving
+ * without first joining fails. Leaving consumer groups over HTTP is not
+ * supported.
+ *
+ * @param stream Parent stream, addressed by numeric ID or name.
+ * @param topic Parent topic, addressed by numeric ID or name.
+ * @param group Consumer group to leave, addressed by numeric ID or name.
+ * @throws IggyException if the client is unavailable or unauthenticated;
+ * an identifier is invalid; the stream, topic, or consumer group
+ * does not exist; this client is not a member; the caller lacks
+ * read permission; the transport does not support group
+ * membership; or the request fails.
+ */
+ void LeaveConsumerGroup(const Identifier &stream, const Identifier &topic,
const Identifier &group);
+
+ /**
+ * @brief Stores an offset for a consumer or consumer group.
+ *
+ * The server accepts offsets from zero through the partition's current
+ * offset, inclusive. It rejects every offset for an empty partition and
+ * any offset beyond the current offset. Storing another value for the same
+ * consumer and partition replaces the previous value.
+ *
+ * For a consumer group, the group must exist and the current client must
+ * own @p partition_id in that group. This ownership fence does not apply
to
+ * individual consumers.
+ *
+ * @param consumer Consumer identity that owns the offset.
+ * @param stream Parent stream, addressed by numeric ID or name.
+ * @param topic Parent topic, addressed by numeric ID or name.
+ * @param offset Message offset to store.
+ * @param partition_id Partition whose offset is stored.
+ * @throws IggyException if an identifier, partition, or offset is invalid;
+ * the resource does not exist; the client is unauthenticated; the
+ * caller lacks permission; or the request fails.
+ */
+ void StoreConsumerOffset(const Consumer &consumer,
+ const Identifier &stream,
+ const Identifier &topic,
+ std::uint64_t offset,
+ std::uint32_t partition_id);
+
+ /**
+ * @brief Retrieves the stored offset for a consumer or consumer group.
+ *
+ * This method throws IggyException when no offset has been stored. A
+ * consumer group offset can be read by an authenticated caller with poll
+ * permission even when that client is not a member of the group.
+ *
+ * An offset created by an auto-commit poll is visible through this method.
+ * A local auto-commit cursor can be visible before its durable store has
+ * committed.
+ *
+ * @param consumer Consumer identity that owns the offset.
+ * @param stream Parent stream, addressed by numeric ID or name.
+ * @param topic Parent topic, addressed by numeric ID or name.
+ * @param partition_id Partition whose offset is retrieved.
+ * @return Partition state and the stored consumer offset.
+ * @throws IggyException if an identifier or partition is invalid; the
+ * resource or stored offset does not exist; the client is
+ * unauthenticated; the caller lacks permission; or the request
+ * fails.
+ */
+ ConsumerOffsetInfo GetConsumerOffset(const Consumer &consumer,
Review Comment:
done
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