Add trace archive location serialization/deserialization methods
authorJérémie Galarneau <jeremie.galarneau@efficios.com>
Fri, 17 Aug 2018 17:25:21 +0000 (13:25 -0400)
committerJérémie Galarneau <jeremie.galarneau@efficios.com>
Thu, 23 Aug 2018 00:18:09 +0000 (20:18 -0400)
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>
include/lttng/location-internal.h
src/common/location.c

index dc7137337641ba35417f645fd4c86d3c69428c4f..568040da829a0b1815d9571e71992fe8fb9ed739 100644 (file)
@@ -19,6 +19,8 @@
 #define LTTNG_LOCATION_INTERNAL_H
 
 #include <lttng/location.h>
+#include <common/dynamic-buffer.h>
+#include <common/buffer-view.h>
 #include <common/macros.h>
 
 struct lttng_trace_archive_location {
@@ -38,6 +40,41 @@ struct lttng_trace_archive_location {
        } types;
 };
 
+struct lttng_trace_archive_location_comm {
+       /* A value from enum lttng_trace_archive_location_type */
+       int8_t type;
+       union {
+               struct {
+                       /* Includes the trailing \0. */
+                       uint32_t absolute_path_len;
+               } LTTNG_PACKED local;
+               struct {
+                       /* Includes the trailing \0. */
+                       uint32_t hostname_len;
+                       /*
+                        * A value from
+                        * enum lttng_trace_archive_location_relay_protocol_type.
+                        */
+                       int8_t protocol;
+                       struct {
+                               uint16_t control, data;
+                       } ports;
+                       /* Includes the trailing \0. */
+                       uint32_t relative_path_len;
+               } LTTNG_PACKED relay;
+       } LTTNG_PACKED types;
+       /*
+        * Payload is composed of:
+        * - LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_LOCAL
+        *   - absolute path, including \0
+        * - LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_RELAY
+        *   - hostname, including \0
+        *   - relative path, including \0
+        */
+       char payload[];
+} LTTNG_PACKED;
+
+
 LTTNG_HIDDEN
 struct lttng_trace_archive_location *lttng_trace_archive_location_local_create(
                const char *path);
@@ -49,6 +86,16 @@ struct lttng_trace_archive_location *lttng_trace_archive_location_relay_create(
                uint16_t control_port, uint16_t data_port,
                const char *relative_path);
 
+LTTNG_HIDDEN
+ssize_t lttng_trace_archive_location_create_from_buffer(
+               const struct lttng_buffer_view *buffer,
+               struct lttng_trace_archive_location **location);
+
+LTTNG_HIDDEN
+ssize_t lttng_trace_archive_location_serialize(
+               const struct lttng_trace_archive_location *location,
+               struct lttng_dynamic_buffer *buffer);
+
 LTTNG_HIDDEN
 void lttng_trace_archive_location_destroy(
                struct lttng_trace_archive_location *location);
index d1fd538f2933994e0ba91be7e6ecfa28d8bd4687..0482c443df5a2c50fc46a886a4f21847198a636c 100644 (file)
@@ -124,6 +124,155 @@ error:
        return NULL;
 }
 
+LTTNG_HIDDEN
+ssize_t lttng_trace_archive_location_create_from_buffer(
+               const struct lttng_buffer_view *view,
+               struct lttng_trace_archive_location **location)
+{
+       size_t offset = 0;
+       const struct lttng_trace_archive_location_comm *location_comm;
+       struct lttng_buffer_view location_comm_view;
+
+       location_comm_view = lttng_buffer_view_from_view(view, 0,
+                       sizeof(*location_comm));
+       if (!location_comm_view.data) {
+               goto error;
+       }
+       offset += location_comm_view.size;
+       location_comm = (const struct lttng_trace_archive_location_comm *) view->data;
+
+       switch ((enum lttng_trace_archive_location_type) location_comm->type) {
+       case LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_LOCAL:
+       {
+               const struct lttng_buffer_view absolute_path_view =
+                               lttng_buffer_view_from_view(view, offset,
+                               location_comm->types.local.absolute_path_len);
+
+               if (!absolute_path_view.data) {
+                       goto error;
+               }
+               if (absolute_path_view.data[absolute_path_view.size - 1] != '\0') {
+                       goto error;
+               }
+               offset += absolute_path_view.size;
+
+               *location = lttng_trace_archive_location_local_create(
+                               absolute_path_view.data);
+               if (!*location) {
+                       goto error;
+               }
+               break;
+       }
+       case LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_RELAY:
+       {
+               const struct lttng_buffer_view hostname_view =
+                               lttng_buffer_view_from_view(view, offset,
+                               location_comm->types.relay.hostname_len);
+               const struct lttng_buffer_view relative_path_view =
+                               lttng_buffer_view_from_view(view,
+                               offset + hostname_view.size,
+                               location_comm->types.relay.relative_path_len);
+
+               if (!hostname_view.data || !relative_path_view.data) {
+                       goto error;
+               }
+               if (hostname_view.data[hostname_view.size - 1] != '\0') {
+                       goto error;
+               }
+               if (relative_path_view.data[relative_path_view.size - 1] != '\0') {
+                       goto error;
+               }
+               offset += hostname_view.size + relative_path_view.size;
+
+               *location = lttng_trace_archive_location_relay_create(
+                               hostname_view.data,
+                               (enum lttng_trace_archive_location_relay_protocol_type) location_comm->types.relay.protocol,
+                               location_comm->types.relay.ports.control,
+                               location_comm->types.relay.ports.data,
+                               relative_path_view.data);
+               if (!*location) {
+                       goto error;
+               }
+               break;
+       }
+       default:
+               goto error;
+       }
+
+error:
+       return -1;
+}
+
+LTTNG_HIDDEN
+ssize_t lttng_trace_archive_location_serialize(
+               const struct lttng_trace_archive_location *location,
+               struct lttng_dynamic_buffer *buffer)
+{
+       int ret;
+       struct lttng_trace_archive_location_comm location_comm;
+       const size_t original_buffer_size = buffer->size;
+
+       location_comm.type = (int8_t) location->type;
+
+       switch (location->type) {
+       case LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_LOCAL:
+               location_comm.types.local.absolute_path_len =
+                               strlen(location->types.local.absolute_path) + 1;
+               break;
+       case LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_RELAY:
+               location_comm.types.relay.hostname_len =
+                               strlen(location->types.relay.host) + 1;
+               location_comm.types.relay.protocol =
+                               (int8_t) location->types.relay.protocol;
+               location_comm.types.relay.ports.control =
+                               location->types.relay.ports.control;
+               location_comm.types.relay.ports.data =
+                               location->types.relay.ports.data;
+               location_comm.types.relay.relative_path_len =
+                               strlen(location->types.relay.relative_path) + 1;
+               break;
+       default:
+               abort();
+       }
+
+       ret = lttng_dynamic_buffer_append(buffer, &location_comm,
+                       sizeof(location_comm));
+       if (ret) {
+               goto error;
+       }
+
+       switch (location->type) {
+       case LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_LOCAL:
+               ret = lttng_dynamic_buffer_append(buffer,
+                               location->types.local.absolute_path,
+                               location_comm.types.local.absolute_path_len);
+               if (ret) {
+                       goto error;
+               }
+               break;
+       case LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_RELAY:
+               ret = lttng_dynamic_buffer_append(buffer,
+                               location->types.relay.host,
+                               location_comm.types.relay.hostname_len);
+               if (ret) {
+                       goto error;
+               }
+               ret = lttng_dynamic_buffer_append(buffer,
+                               location->types.relay.relative_path,
+                               location_comm.types.relay.relative_path_len);
+               if (ret) {
+                       goto error;
+               }
+               break;
+       default:
+               abort();
+       }
+
+       return buffer->size - original_buffer_size;
+error:
+       return -1;
+}
+
 enum lttng_trace_archive_location_type lttng_trace_archive_location_get_type(
                const struct lttng_trace_archive_location *location)
 {
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