| /* |
| * |
| * Copyright 2016, 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_CORE_EXT_CENSUS_TRACE_PROPAGATION_H |
| #define GRPC_CORE_EXT_CENSUS_TRACE_PROPAGATION_H |
| |
| #include "src/core/ext/census/tracing.h" |
| |
| /* 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); |
| |
| #endif /* GRPC_CORE_EXT_CENSUS_TRACE_PROPAGATION_H */ |