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/*
*
* Copyright 2017 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_CHANNEL_CHANNEL_TRACER_H
#define GRPC_CORE_LIB_CHANNEL_CHANNEL_TRACER_H
#include <grpc/grpc.h>
#include "src/core/lib/iomgr/error.h"
#include "src/core/lib/json/json.h"
namespace grpc_core {
class TraceEvent;
class ChannelTracer {
public:
ChannelTracer(size_t max_nodes);
~ChannelTracer() {}
// TODO(ncteisen): incorporate RefCounted class
ChannelTracer* Ref();
void Unref();
/* returns the tracers uuid */
intptr_t GetUuid();
/* Adds a new trace node to the tracing object */
void AddTrace(grpc_slice data, grpc_error* error,
grpc_connectivity_state connectivity_state,
ChannelTracer* subchannel);
/* Returns the tracing data rendered as a grpc json string.
The string is owned by the caller and must be freed. If recursive
is true, then the string will include the recursive trace for all
subtracing objects. */
char* RenderTrace(bool recursive);
/* util functions that perform the uuid -> tracer step for you, and then
returns the trace for the uuid given. */
static char* GetChannelTraceFromUuid(intptr_t uuid, bool recursive);
private:
// Internal helper that frees a TraceEvent.
void FreeNode(TraceEvent* node);
friend class ChannelTracerRenderer;
gpr_refcount refs_;
gpr_mu tracer_mu_;
intptr_t channel_uuid_;
uint64_t num_nodes_logged_;
uint64_t num_children_seen_;
size_t list_size_;
size_t max_list_size_;
TraceEvent* head_trace_;
TraceEvent* tail_trace_;
gpr_timespec time_created_;
};
} // namespace grpc_core
#endif /* GRPC_CORE_LIB_CHANNEL_CHANNEL_TRACER_H */
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