| /* |
| * |
| * 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 */ |