1 files changed, 89 insertions, 0 deletions
diff --git a/src/core/ext/filters/client_channel/lb_policy/xds/load_balancer_api.h b/src/core/ext/filters/client_channel/lb_policy/xds/load_balancer_api.h
new file mode 100644
index 0000000000..3f096af6d6
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+++ b/src/core/ext/filters/client_channel/lb_policy/xds/load_balancer_api.h
@@ -0,0 +1,89 @@
+/*
+ *
+ * Copyright 2018 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_EXT_FILTERS_CLIENT_CHANNEL_LB_POLICY_XDS_LOAD_BALANCER_API_H
+#define GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_LB_POLICY_XDS_LOAD_BALANCER_API_H
+
+#include <grpc/support/port_platform.h>
+
+#include <grpc/slice_buffer.h>
+
+#include "src/core/ext/filters/client_channel/lb_policy/grpclb/proto/grpc/lb/v1/load_balancer.pb.h"
+#include "src/core/ext/filters/client_channel/lb_policy/xds/xds_client_stats.h"
+#include "src/core/ext/filters/client_channel/lb_policy_factory.h"
+
+#define XDS_SERVICE_NAME_MAX_LENGTH 128
+
+typedef grpc_lb_v1_Server_ip_address_t xds_grpclb_ip_address;
+typedef grpc_lb_v1_LoadBalanceRequest xds_grpclb_request;
+typedef grpc_lb_v1_InitialLoadBalanceResponse xds_grpclb_initial_response;
+typedef grpc_lb_v1_Server xds_grpclb_server;
+typedef google_protobuf_Duration xds_grpclb_duration;
+typedef google_protobuf_Timestamp xds_grpclb_timestamp;
+
+typedef struct {
+  xds_grpclb_server** servers;
+  size_t num_servers;
+} xds_grpclb_serverlist;
+
+/** Create a request for a gRPC LB service under \a lb_service_name */
+xds_grpclb_request* xds_grpclb_request_create(const char* lb_service_name);
+xds_grpclb_request* xds_grpclb_load_report_request_create_locked(
+    grpc_core::XdsLbClientStats* client_stats);
+
+/** Protocol Buffers v3-encode \a request */
+grpc_slice xds_grpclb_request_encode(const xds_grpclb_request* request);
+
+/** Destroy \a request */
+void xds_grpclb_request_destroy(xds_grpclb_request* request);
+
+/** Parse (ie, decode) the bytes in \a encoded_xds_grpclb_response as a \a
+ * xds_grpclb_initial_response */
+xds_grpclb_initial_response* xds_grpclb_initial_response_parse(
+    grpc_slice encoded_xds_grpclb_response);
+
+/** Parse the list of servers from an encoded \a xds_grpclb_response */
+xds_grpclb_serverlist* xds_grpclb_response_parse_serverlist(
+    grpc_slice encoded_xds_grpclb_response);
+
+/** Return a copy of \a sl. The caller is responsible for calling \a
+ * xds_grpclb_destroy_serverlist on the returned copy. */
+xds_grpclb_serverlist* xds_grpclb_serverlist_copy(
+    const xds_grpclb_serverlist* sl);
+
+bool xds_grpclb_serverlist_equals(const xds_grpclb_serverlist* lhs,
+                                  const xds_grpclb_serverlist* rhs);
+
+bool xds_grpclb_server_equals(const xds_grpclb_server* lhs,
+                              const xds_grpclb_server* rhs);
+
+/** Destroy \a serverlist */
+void xds_grpclb_destroy_serverlist(xds_grpclb_serverlist* serverlist);
+
+/** Compare \a lhs against \a rhs and return 0 if \a lhs and \a rhs are equal,
+ * < 0 if \a lhs represents a duration shorter than \a rhs and > 0 otherwise */
+int xds_grpclb_duration_compare(const xds_grpclb_duration* lhs,
+                                const xds_grpclb_duration* rhs);
+
+grpc_millis xds_grpclb_duration_to_millis(xds_grpclb_duration* duration_pb);
+
+/** Destroy \a initial_response */
+void xds_grpclb_initial_response_destroy(xds_grpclb_initial_response* response);
+
+#endif /* GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_LB_POLICY_XDS_LOAD_BALANCER_API_H \
+        */