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/*
*
* Copyright 2016 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_TRACE_PROPAGATION_H
#define GRPC_CORE_EXT_CENSUS_TRACE_PROPAGATION_H
#include "src/core/ext/census/tracing.h"
#ifdef __cplusplus
extern "C" {
#endif
/* Encoding and decoding functions for receiving and sending trace contexts
over the wire. Only RPC libraries should be calling these
functions. These functions return the number of bytes encoded/decoded
(0 if a failure has occurred). buf_size indicates the size of the
input/output buffer. trace_span_context is a struct that includes the
trace ID, span ID, and a set of option flags (is_sampled, etc.). */
/* Converts a span context to a binary byte buffer. */
size_t trace_span_context_to_binary(const trace_span_context *ctxt,
uint8_t *buf, size_t buf_size);
/* Reads a binary byte buffer and populates a span context structure. */
size_t binary_to_trace_span_context(const uint8_t *buf, size_t buf_size,
trace_span_context *ctxt);
/* Converts a span context to an http metadata compatible string. */
size_t trace_span_context_to_http_format(const trace_span_context *ctxt,
char *buf, size_t buf_size);
/* Reads an http metadata compatible string and populates a span context
structure. */
size_t http_format_to_trace_span_context(const char *buf, size_t buf_size,
trace_span_context *ctxt);
#ifdef __cplusplus
}
#endif
#endif /* GRPC_CORE_EXT_CENSUS_TRACE_PROPAGATION_H */
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