--- /dev/null
+/*
+ *
+ * Copyright 2015 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#ifndef GRPC_CORE_LIB_TRANSPORT_METADATA_BATCH_H
+#define GRPC_CORE_LIB_TRANSPORT_METADATA_BATCH_H
+
+#include <grpc/support/port_platform.h>
+
+#include <stdbool.h>
+
+#include <grpc/grpc.h>
+#include <grpc/slice.h>
+#include <grpc/support/time.h>
+#include "src/core/lib/iomgr/exec_ctx.h"
+#include "src/core/lib/transport/metadata.h"
+#include "src/core/lib/transport/static_metadata.h"
+
+typedef struct grpc_linked_mdelem {
+ grpc_linked_mdelem() {}
+
+ grpc_mdelem md;
+ struct grpc_linked_mdelem* next = nullptr;
+ struct grpc_linked_mdelem* prev = nullptr;
+ void* reserved;
+} grpc_linked_mdelem;
+
+typedef struct grpc_mdelem_list {
+ size_t count;
+ size_t default_count; // Number of default keys.
+ grpc_linked_mdelem* head;
+ grpc_linked_mdelem* tail;
+} grpc_mdelem_list;
+
+typedef struct grpc_metadata_batch {
+ /** Metadata elements in this batch */
+ grpc_mdelem_list list;
+ grpc_metadata_batch_callouts idx;
+ /** Used to calculate grpc-timeout at the point of sending,
+ or GRPC_MILLIS_INF_FUTURE if this batch does not need to send a
+ grpc-timeout */
+ grpc_millis deadline;
+} grpc_metadata_batch;
+
+void grpc_metadata_batch_init(grpc_metadata_batch* batch);
+void grpc_metadata_batch_destroy(grpc_metadata_batch* batch);
+void grpc_metadata_batch_clear(grpc_metadata_batch* batch);
+bool grpc_metadata_batch_is_empty(grpc_metadata_batch* batch);
+
+/* Returns the transport size of the batch. */
+size_t grpc_metadata_batch_size(grpc_metadata_batch* batch);
+
+/** Remove \a storage from the batch, unreffing the mdelem contained */
+void grpc_metadata_batch_remove(grpc_metadata_batch* batch,
+ grpc_linked_mdelem* storage);
+void grpc_metadata_batch_remove(grpc_metadata_batch* batch,
+ grpc_metadata_batch_callouts_index idx);
+
+/** Substitute a new mdelem for an old value */
+grpc_error* grpc_metadata_batch_substitute(grpc_metadata_batch* batch,
+ grpc_linked_mdelem* storage,
+ grpc_mdelem new_value);
+
+void grpc_metadata_batch_set_value(grpc_linked_mdelem* storage,
+ const grpc_slice& value);
+
+/** Add \a storage to the beginning of \a batch. storage->md is
+ assumed to be valid.
+ \a storage is owned by the caller and must survive for the
+ lifetime of batch. This usually means it should be around
+ for the lifetime of the call. */
+grpc_error* grpc_metadata_batch_link_head(grpc_metadata_batch* batch,
+ grpc_linked_mdelem* storage)
+ GRPC_MUST_USE_RESULT;
+grpc_error* grpc_metadata_batch_link_head(
+ grpc_metadata_batch* batch, grpc_linked_mdelem* storage,
+ grpc_metadata_batch_callouts_index idx) GRPC_MUST_USE_RESULT;
+
+/** Add \a storage to the end of \a batch. storage->md is
+ assumed to be valid.
+ \a storage is owned by the caller and must survive for the
+ lifetime of batch. This usually means it should be around
+ for the lifetime of the call. */
+grpc_error* grpc_metadata_batch_link_tail(grpc_metadata_batch* batch,
+ grpc_linked_mdelem* storage)
+ GRPC_MUST_USE_RESULT;
+grpc_error* grpc_metadata_batch_link_tail(
+ grpc_metadata_batch* batch, grpc_linked_mdelem* storage,
+ grpc_metadata_batch_callouts_index idx) GRPC_MUST_USE_RESULT;
+
+/** Add \a elem_to_add as the first element in \a batch, using
+ \a storage as backing storage for the linked list element.
+ \a storage is owned by the caller and must survive for the
+ lifetime of batch. This usually means it should be around
+ for the lifetime of the call.
+ Takes ownership of \a elem_to_add */
+grpc_error* grpc_metadata_batch_add_head(
+ grpc_metadata_batch* batch, grpc_linked_mdelem* storage,
+ grpc_mdelem elem_to_add) GRPC_MUST_USE_RESULT;
+
+// TODO(arjunroy, roth): Remove redundant methods.
+// add/link_head/tail are almost identical.
+inline grpc_error* GRPC_MUST_USE_RESULT grpc_metadata_batch_add_head(
+ grpc_metadata_batch* batch, grpc_linked_mdelem* storage,
+ grpc_metadata_batch_callouts_index idx) {
+ return grpc_metadata_batch_link_head(batch, storage, idx);
+}
+
+inline grpc_error* GRPC_MUST_USE_RESULT grpc_metadata_batch_add_head(
+ grpc_metadata_batch* batch, grpc_linked_mdelem* storage,
+ grpc_mdelem elem_to_add, grpc_metadata_batch_callouts_index idx) {
+ GPR_DEBUG_ASSERT(!GRPC_MDISNULL(elem_to_add));
+ storage->md = elem_to_add;
+ return grpc_metadata_batch_add_head(batch, storage, idx);
+}
+
+/** Add \a elem_to_add as the last element in \a batch, using
+ \a storage as backing storage for the linked list element.
+ \a storage is owned by the caller and must survive for the
+ lifetime of batch. This usually means it should be around
+ for the lifetime of the call.
+ Takes ownership of \a elem_to_add */
+grpc_error* grpc_metadata_batch_add_tail(
+ grpc_metadata_batch* batch, grpc_linked_mdelem* storage,
+ grpc_mdelem elem_to_add) GRPC_MUST_USE_RESULT;
+
+inline grpc_error* GRPC_MUST_USE_RESULT grpc_metadata_batch_add_tail(
+ grpc_metadata_batch* batch, grpc_linked_mdelem* storage,
+ grpc_metadata_batch_callouts_index idx) {
+ return grpc_metadata_batch_link_tail(batch, storage, idx);
+}
+
+inline grpc_error* GRPC_MUST_USE_RESULT grpc_metadata_batch_add_tail(
+ grpc_metadata_batch* batch, grpc_linked_mdelem* storage,
+ grpc_mdelem elem_to_add, grpc_metadata_batch_callouts_index idx) {
+ GPR_DEBUG_ASSERT(!GRPC_MDISNULL(elem_to_add));
+ storage->md = elem_to_add;
+ return grpc_metadata_batch_add_tail(batch, storage, idx);
+}
+
+grpc_error* grpc_attach_md_to_error(grpc_error* src, grpc_mdelem md);
+
+typedef struct {
+ grpc_error* error;
+ grpc_mdelem md;
+} grpc_filtered_mdelem;
+
+#define GRPC_FILTERED_ERROR(error) \
+ { (error), GRPC_MDNULL }
+#define GRPC_FILTERED_MDELEM(md) \
+ { GRPC_ERROR_NONE, (md) }
+#define GRPC_FILTERED_REMOVE() \
+ { GRPC_ERROR_NONE, GRPC_MDNULL }
+
+typedef grpc_filtered_mdelem (*grpc_metadata_batch_filter_func)(
+ void* user_data, grpc_mdelem elem);
+grpc_error* grpc_metadata_batch_filter(
+ grpc_metadata_batch* batch, grpc_metadata_batch_filter_func func,
+ void* user_data, const char* composite_error_string) GRPC_MUST_USE_RESULT;
+
+#ifndef NDEBUG
+void grpc_metadata_batch_assert_ok(grpc_metadata_batch* comd);
+#else
+#define grpc_metadata_batch_assert_ok(comd) \
+ do { \
+ } while (0)
+#endif
+
+/// Copies \a src to \a dst. \a storage must point to an array of
+/// \a grpc_linked_mdelem structs of at least the same size as \a src.
+void grpc_metadata_batch_copy(grpc_metadata_batch* src,
+ grpc_metadata_batch* dst,
+ grpc_linked_mdelem* storage);
+
+void grpc_metadata_batch_move(grpc_metadata_batch* src,
+ grpc_metadata_batch* dst);
+
+#endif /* GRPC_CORE_LIB_TRANSPORT_METADATA_BATCH_H */
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