128 lines
3.8 KiB
C++
128 lines
3.8 KiB
C++
// Copyright The OpenTelemetry Authors
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// SPDX-License-Identifier: Apache-2.0
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#pragma once
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#include "detail/hex.h"
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#include "detail/string.h"
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#include "opentelemetry/context/propagation/text_map_propagator.h"
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#include "opentelemetry/trace/context.h"
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#include "opentelemetry/trace/default_span.h"
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OPENTELEMETRY_BEGIN_NAMESPACE
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namespace trace
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{
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namespace propagation
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{
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static const nostd::string_view kJaegerTraceHeader = "uber-trace-id";
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class JaegerPropagator : public context::propagation::TextMapPropagator
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{
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public:
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void Inject(context::propagation::TextMapCarrier &carrier,
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const context::Context &context) noexcept override
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{
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SpanContext span_context = trace::GetSpan(context)->GetContext();
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if (!span_context.IsValid())
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{
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return;
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}
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const size_t trace_id_length = 32;
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const size_t span_id_length = 16;
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// trace-id(32):span-id(16):0:debug(2)
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char trace_identity[trace_id_length + span_id_length + 6];
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span_context.trace_id().ToLowerBase16(
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nostd::span<char, 2 * TraceId::kSize>{&trace_identity[0], trace_id_length});
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trace_identity[trace_id_length] = ':';
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span_context.span_id().ToLowerBase16(
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nostd::span<char, 2 * SpanId::kSize>{&trace_identity[trace_id_length + 1], span_id_length});
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trace_identity[trace_id_length + span_id_length + 1] = ':';
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trace_identity[trace_id_length + span_id_length + 2] = '0';
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trace_identity[trace_id_length + span_id_length + 3] = ':';
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trace_identity[trace_id_length + span_id_length + 4] = '0';
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trace_identity[trace_id_length + span_id_length + 5] = span_context.IsSampled() ? '1' : '0';
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carrier.Set(kJaegerTraceHeader, nostd::string_view(trace_identity, sizeof(trace_identity)));
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}
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context::Context Extract(const context::propagation::TextMapCarrier &carrier,
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context::Context &context) noexcept override
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{
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SpanContext span_context = ExtractImpl(carrier);
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nostd::shared_ptr<Span> sp{new DefaultSpan(span_context)};
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if (span_context.IsValid())
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{
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return trace::SetSpan(context, sp);
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}
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else
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{
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return context;
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}
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}
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bool Fields(nostd::function_ref<bool(nostd::string_view)> callback) const noexcept override
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{
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return callback(kJaegerTraceHeader);
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}
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private:
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static constexpr uint8_t kIsSampled = 0x01;
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static TraceFlags GetTraceFlags(uint8_t jaeger_flags)
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{
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uint8_t sampled = jaeger_flags & kIsSampled;
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return TraceFlags(sampled);
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}
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static SpanContext ExtractImpl(const context::propagation::TextMapCarrier &carrier)
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{
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nostd::string_view trace_identity = carrier.Get(kJaegerTraceHeader);
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const size_t trace_field_count = 4;
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nostd::string_view trace_fields[trace_field_count];
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if (detail::SplitString(trace_identity, ':', trace_fields, trace_field_count) !=
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trace_field_count)
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{
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return SpanContext::GetInvalid();
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}
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nostd::string_view trace_id_hex = trace_fields[0];
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nostd::string_view span_id_hex = trace_fields[1];
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nostd::string_view flags_hex = trace_fields[3];
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if (!detail::IsValidHex(trace_id_hex) || !detail::IsValidHex(span_id_hex) ||
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!detail::IsValidHex(flags_hex))
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{
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return SpanContext::GetInvalid();
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}
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uint8_t trace_id[16];
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if (!detail::HexToBinary(trace_id_hex, trace_id, sizeof(trace_id)))
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{
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return SpanContext::GetInvalid();
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}
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uint8_t span_id[8];
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if (!detail::HexToBinary(span_id_hex, span_id, sizeof(span_id)))
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{
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return SpanContext::GetInvalid();
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}
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uint8_t flags;
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if (!detail::HexToBinary(flags_hex, &flags, sizeof(flags)))
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{
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return SpanContext::GetInvalid();
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}
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return SpanContext(TraceId(trace_id), SpanId(span_id), GetTraceFlags(flags), true);
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}
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};
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} // namespace propagation
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} // namespace trace
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OPENTELEMETRY_END_NAMESPACE
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