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/*
*
* 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_INTERNAL_CPP_EXT_FILTERS_CENSUS_CLIENT_FILTER_H
#define GRPC_INTERNAL_CPP_EXT_FILTERS_CENSUS_CLIENT_FILTER_H
#include <grpc/support/port_platform.h>
#include "absl/strings/string_view.h"
#include "absl/time/time.h"
#include "src/cpp/ext/filters/census/channel_filter.h"
#include "src/cpp/ext/filters/census/context.h"
namespace grpc {
// A CallData class will be created for every grpc call within a channel. It is
// used to store data and methods specific to that call. CensusClientCallData is
// thread-compatible, however typically only 1 thread should be interacting with
// a call at a time.
class CensusClientCallData : public CallData {
public:
// Maximum size of trace context is sent on the wire.
static constexpr uint32_t kMaxTraceContextLen = 64;
// Maximum size of tags that are sent on the wire.
static constexpr uint32_t kMaxTagsLen = 2048;
CensusClientCallData()
: recv_trailing_metadata_(nullptr),
initial_on_done_recv_trailing_metadata_(nullptr),
initial_on_done_recv_message_(nullptr),
elapsed_time_(0),
recv_message_(nullptr),
recv_message_count_(0),
sent_message_count_(0) {
memset(&stats_bin_, 0, sizeof(grpc_linked_mdelem));
memset(&tracing_bin_, 0, sizeof(grpc_linked_mdelem));
memset(&path_, 0, sizeof(grpc_slice));
memset(&on_done_recv_trailing_metadata_, 0, sizeof(grpc_closure));
memset(&on_done_recv_message_, 0, sizeof(grpc_closure));
}
grpc_error* Init(grpc_call_element* elem,
const grpc_call_element_args* args) override;
void Destroy(grpc_call_element* elem, const grpc_call_final_info* final_info,
grpc_closure* then_call_closure) override;
void StartTransportStreamOpBatch(grpc_call_element* elem,
TransportStreamOpBatch* op) override;
static void OnDoneRecvTrailingMetadataCb(void* user_data, grpc_error* error);
static void OnDoneSendInitialMetadataCb(void* user_data, grpc_error* error);
static void OnDoneRecvMessageCb(void* user_data, grpc_error* error);
private:
CensusContext context_;
// Metadata elements for tracing and census stats data.
grpc_linked_mdelem stats_bin_;
grpc_linked_mdelem tracing_bin_;
// Client method.
absl::string_view method_;
std::string qualified_method_;
grpc_slice path_;
// The recv trailing metadata callbacks.
grpc_metadata_batch* recv_trailing_metadata_;
grpc_closure* initial_on_done_recv_trailing_metadata_;
grpc_closure on_done_recv_trailing_metadata_;
// recv message
grpc_closure* initial_on_done_recv_message_;
grpc_closure on_done_recv_message_;
// Start time (for measuring latency).
absl::Time start_time_;
// Server elapsed time in nanoseconds.
uint64_t elapsed_time_;
// The received message--may be null.
grpc_core::OrphanablePtr<grpc_core::ByteStream>* recv_message_;
// Number of messages in this RPC.
uint64_t recv_message_count_;
uint64_t sent_message_count_;
// Buffer needed for grpc_slice to reference when adding trace context
// metatdata to outgoing message.
char tracing_buf_[kMaxTraceContextLen];
};
} // namespace grpc
#endif /* GRPC_INTERNAL_CPP_EXT_FILTERS_CENSUS_CLIENT_FILTER_H */
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