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/***
* Copyright 2020 HAProxy Technologies
*
* 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 _OPENTRACING_C_WRAPPER_TRACER_H_
#define _OPENTRACING_C_WRAPPER_TRACER_H_
using TextMap = std::unordered_map<std::string, std::string>;
class TextMapCarrier : public opentracing::TextMapReader, public opentracing::TextMapWriter {
public:
TextMapCarrier(TextMap &text_map) : tm_data(text_map) {}
/***
* TextMapWriter: Set a key:value pair to the carrier. Multiple calls
* to Set() for the same key leads to undefined behavior.
*/
opentracing::expected<void> Set(opentracing::string_view key, opentracing::string_view value) const override
{
tm_data[key] = value;
return {};
}
/***
* TextMapReader: LookupKey() returns the value for the specified
* key if available. If no such key is present, it returns
* key_not_found_error.
*/
opentracing::expected<opentracing::string_view> LookupKey(opentracing::string_view key) const override
{
auto iter = tm_data.find(key);
if (iter != tm_data.end())
return opentracing::string_view{iter->second};
return opentracing::make_unexpected(opentracing::key_not_found_error);
}
/***
* TextMapReader: ForeachKey() returns TextMap contents via repeated
* calls to the f() function. If any call to f() returns an error,
* ForeachKey() terminates and returns that error.
*/
opentracing::expected<void> ForeachKey(std::function<opentracing::expected<void>(opentracing::string_view key, opentracing::string_view value)> f) const override
{
for (const auto &text_map : tm_data) {
auto result = f(text_map.first, text_map.second);
if (!result)
return result;
}
return {};
}
private:
TextMap &tm_data;
};
class HTTPHeadersCarrier : public opentracing::HTTPHeadersReader, public opentracing::HTTPHeadersWriter {
public:
HTTPHeadersCarrier(TextMap &text_map) : tm_data(text_map) {}
/***
* HTTPHeadersWriter: Set a key:value pair to the carrier. Multiple calls
* to Set() for the same key leads to undefined behavior.
*/
opentracing::expected<void> Set(opentracing::string_view key, opentracing::string_view value) const override
{
tm_data[key] = value;
return {};
}
/***
* HTTPHeadersReader: LookupKey() returns the value for the specified
* key if available. If no such key is present, it returns
* key_not_found_error.
*/
opentracing::expected<opentracing::string_view> LookupKey(opentracing::string_view key) const override
{
auto iter = tm_data.find(key);
if (iter != tm_data.end())
return opentracing::string_view{iter->second};
return opentracing::make_unexpected(opentracing::key_not_found_error);
}
/***
* HTTPHeadersReader: ForeachKey() returns TextMap contents via repeated
* calls to the f() function. If any call to f() returns an error,
* ForeachKey() terminates and returns that error.
*/
opentracing::expected<void> ForeachKey(std::function<opentracing::expected<void>(opentracing::string_view key, opentracing::string_view value)> f) const override
{
for (const auto &text_map : tm_data) {
auto result = f(text_map.first, text_map.second);
if (!result)
return result;
}
return {};
}
private:
TextMap &tm_data;
};
struct otc_tracer *ot_tracer_new(void);
#endif /* _OPENTRACING_C_WRAPPER_TRACER_H_ */
/*
* Local variables:
* c-indent-level: 8
* c-basic-offset: 8
* End:
*
* vi: noexpandtab shiftwidth=8 tabstop=8
*/
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