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/*
*
* 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_EXT_CENSUS_CENSUS_INTERFACE_H
#define GRPC_CORE_EXT_CENSUS_CENSUS_INTERFACE_H
#include <grpc/support/port_platform.h>
/* Maximum length of an individual census trace annotation. */
#define CENSUS_MAX_ANNOTATION_LENGTH 200
#ifdef __cplusplus
extern "C" {
#endif
/* 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 {
uint32_t upper;
uint32_t 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(void);
/* Shutdown Census Library. */
void census_shutdown(void);
/* 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(void);
/* Ends tracing. Calling this function will invalidate the input op_id. */
void census_tracing_end_op(census_op_id op_id);
#ifdef __cplusplus
}
#endif
#endif /* GRPC_CORE_EXT_CENSUS_CENSUS_INTERFACE_H */
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