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Merge pull request #82 from DataDog/willgittoes-dd/b3-headers-flags
Add environment variables for B3 header propagation
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,57 @@ | ||
| #include "tracer_options.h" | ||
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| #include <iterator> | ||
| #include <sstream> | ||
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| namespace ot = opentracing; | ||
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| namespace datadog { | ||
| namespace opentracing { | ||
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| ot::expected<TracerOptions, const char *> applyTracerOptionsFromEnvironment( | ||
| const TracerOptions &input) { | ||
| TracerOptions opts = input; | ||
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| auto agent_host = std::getenv("DD_AGENT_HOST"); | ||
| if (agent_host != nullptr && std::strlen(agent_host) > 0) { | ||
| opts.agent_host = agent_host; | ||
| } | ||
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| auto trace_agent_port = std::getenv("DD_TRACE_AGENT_PORT"); | ||
| if (trace_agent_port != nullptr && std::strlen(trace_agent_port) > 0) { | ||
| try { | ||
| opts.agent_port = std::stoi(trace_agent_port); | ||
| } catch (const std::invalid_argument &ia) { | ||
| return ot::make_unexpected("Value for DD_TRACE_AGENT_PORT is invalid"); | ||
| } catch (const std::out_of_range &oor) { | ||
| return ot::make_unexpected("Value for DD_TRACE_AGENT_PORT is out of range"); | ||
| } | ||
| } | ||
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| auto extract = std::getenv("DD_PROPAGATION_STYLE_EXTRACT"); | ||
| if (extract != nullptr && std::strlen(extract) > 0) { | ||
| std::stringstream words{extract}; | ||
| auto style_maybe = asPropagationStyle(std::vector<std::string>{ | ||
| std::istream_iterator<std::string>{words}, std::istream_iterator<std::string>{}}); | ||
| if (!style_maybe) { | ||
| return ot::make_unexpected("Value for DD_PROPAGATION_STYLE_EXTRACT is invalid"); | ||
| } | ||
| opts.extract = style_maybe.value(); | ||
| } | ||
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| auto inject = std::getenv("DD_PROPAGATION_STYLE_INJECT"); | ||
| if (inject != nullptr && std::strlen(inject) > 0) { | ||
| std::stringstream words{inject}; | ||
| auto style_maybe = asPropagationStyle(std::vector<std::string>{ | ||
| std::istream_iterator<std::string>{words}, std::istream_iterator<std::string>{}}); | ||
| if (!style_maybe) { | ||
| return ot::make_unexpected("Value for DD_PROPAGATION_STYLE_INJECT is invalid"); | ||
| } | ||
| opts.inject = style_maybe.value(); | ||
| } | ||
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| return opts; | ||
| } | ||
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| } // namespace opentracing | ||
| } // namespace datadog |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,36 @@ | ||
| #ifndef DD_TRACER_OPTIONS_H | ||
| #define DD_TRACER_OPTIONS_H | ||
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| #include <datadog/opentracing.h> | ||
| #include <opentracing/expected/expected.hpp> | ||
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| namespace ot = opentracing; | ||
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| namespace datadog { | ||
| namespace opentracing { | ||
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| template <class Iterable> | ||
| ot::expected<std::set<PropagationStyle>> asPropagationStyle(Iterable styles) { | ||
| std::set<PropagationStyle> propagation_styles; | ||
| for (const std::string& style : styles) { | ||
| if (style == "Datadog") { | ||
| propagation_styles.insert(PropagationStyle::Datadog); | ||
| } else if (style == "B3") { | ||
| propagation_styles.insert(PropagationStyle::B3); | ||
| } else { | ||
| return ot::make_unexpected(std::make_error_code(std::errc::invalid_argument)); | ||
| } | ||
| } | ||
| if (propagation_styles.size() == 0) { | ||
| return ot::make_unexpected(std::make_error_code(std::errc::invalid_argument)); | ||
| } | ||
| return propagation_styles; | ||
| }; | ||
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| ot::expected<TracerOptions, const char*> applyTracerOptionsFromEnvironment( | ||
| const TracerOptions& input); | ||
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| } // namespace opentracing | ||
| } // namespace datadog | ||
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| #endif // DD_TRACER_OPTIONS_H |
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