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/*
*
* Copyright 2014, Google Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following disclaimer
* in the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/
#ifndef __GRPC_INTERNAL_STATISTICS_CENSUS_INTERFACE_H__
#define __GRPC_INTERNAL_STATISTICS_CENSUS_INTERFACE_H__
#include <grpc/support/port_platform.h>
/* Maximum length of an individual census trace annotation. */
#define CENSUS_MAX_ANNOTATION_LENGTH 200
/* Structure of a census op id. Define as structure because 64bit integer is not
available on every platform for C89. */
typedef struct census_op_id {
gpr_uint32 upper;
gpr_uint32 lower;
} census_op_id;
typedef struct census_rpc_stats census_rpc_stats;
/* Initializes Census library. No-op if Census is already initialized. */
void census_init();
/* Shutdown Census Library. */
void census_shutdown();
/* Annotates grpc method name on a census_op_id. The method name has the format
of <full quantified rpc service name>/<rpc function name>. Returns 0 iff
op_id and method_name are all valid. op_id is valid after its creation and
before calling census_tracing_end_op().
TODO(hongyu): Figure out valid characters set for service name and command
name and document requirements here.*/
int census_add_method_tag(census_op_id op_id, const char* method_name);
/* Annotates tracing information to a specific op_id.
Up to CENSUS_MAX_ANNOTATION_LENGTH bytes are recorded. */
void census_tracing_print(census_op_id op_id, const char* annotation);
/* Starts tracing for an RPC. Returns a locally unique census_op_id */
census_op_id census_tracing_start_op();
/* Ends tracing. Calling this function will invalidate the input op_id. */
void census_tracing_end_op(census_op_id op_id);
#endif /* __GRPC_INTERNAL_STATISTICS_CENSUS_INTERFACE_H__ */
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