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// Copyright The OpenTelemetry Authors
// SPDX-License-Identifier: Apache-2.0
#include <gtest/gtest.h>
#include <cstdint>
#include <map>
#include <string>
#include <utility>
#include <vector>
#include "opentelemetry/common/key_value_iterable_view.h"
#include "opentelemetry/nostd/shared_ptr.h"
#include "opentelemetry/nostd/span.h"
#include "opentelemetry/sdk/trace/sampler.h"
#include "opentelemetry/sdk/trace/samplers/always_off.h"
#include "opentelemetry/sdk/trace/samplers/always_on.h"
#include "opentelemetry/sdk/trace/samplers/parent.h"
#include "opentelemetry/trace/span_context.h"
#include "opentelemetry/trace/span_context_kv_iterable_view.h"
#include "opentelemetry/trace/span_id.h"
#include "opentelemetry/trace/span_metadata.h"
#include "opentelemetry/trace/trace_flags.h"
#include "opentelemetry/trace/trace_id.h"
#include "opentelemetry/trace/trace_state.h"
using opentelemetry::sdk::trace::AlwaysOffSampler;
using opentelemetry::sdk::trace::AlwaysOnSampler;
using opentelemetry::sdk::trace::Decision;
using opentelemetry::sdk::trace::ParentBasedSampler;
namespace trace_api = opentelemetry::trace;
TEST(ParentBasedSampler, ShouldSample)
{
ParentBasedSampler sampler_off(std::make_shared<AlwaysOffSampler>());
ParentBasedSampler sampler_on(std::make_shared<AlwaysOnSampler>());
// Set up parameters
uint8_t trace_id_buffer[trace_api::TraceId::kSize] = {1};
trace_api::TraceId trace_id{trace_id_buffer};
uint8_t span_id_buffer[trace_api::SpanId::kSize] = {1};
trace_api::SpanId span_id{span_id_buffer};
trace_api::SpanKind span_kind = trace_api::SpanKind::kInternal;
using M = std::map<std::string, int>;
M m1 = {{}};
using L = std::vector<std::pair<trace_api::SpanContext, std::map<std::string, std::string>>>;
L l1 = {{trace_api::SpanContext(false, false), {}}, {trace_api::SpanContext(false, false), {}}};
opentelemetry::common::KeyValueIterableView<M> view{m1};
trace_api::SpanContextKeyValueIterableView<L> links{l1};
auto trace_state = trace_api::TraceState::FromHeader("congo=t61rcWkgMzE");
trace_api::SpanContext parent_context_sampled(trace_id, span_id, trace_api::TraceFlags{1}, false,
trace_state);
trace_api::SpanContext parent_context_nonsampled(trace_id, span_id, trace_api::TraceFlags{0},
false, trace_state);
// Case 1: Parent doesn't exist. Return result of delegateSampler()
auto sampling_result = sampler_off.ShouldSample(trace_api::SpanContext::GetInvalid(), trace_id,
"", span_kind, view, links);
auto sampling_result2 = sampler_on.ShouldSample(trace_api::SpanContext::GetInvalid(), trace_id,
"", span_kind, view, links);
ASSERT_EQ(Decision::DROP, sampling_result.decision);
ASSERT_EQ(Decision::RECORD_AND_SAMPLE, sampling_result2.decision);
ASSERT_EQ("", sampling_result.trace_state->ToHeader());
ASSERT_EQ("", sampling_result2.trace_state->ToHeader());
// Case 2: Parent exists and SampledFlag is true
auto sampling_result3 =
sampler_off.ShouldSample(parent_context_sampled, trace_id, "", span_kind, view, links);
ASSERT_EQ(Decision::RECORD_AND_SAMPLE, sampling_result3.decision);
ASSERT_EQ("congo=t61rcWkgMzE", sampling_result3.trace_state->ToHeader());
// Case 3: Parent exists and SampledFlag is false
auto sampling_result4 =
sampler_on.ShouldSample(parent_context_nonsampled, trace_id, "", span_kind, view, links);
ASSERT_EQ(Decision::DROP, sampling_result4.decision);
ASSERT_EQ("congo=t61rcWkgMzE", sampling_result4.trace_state->ToHeader());
}
TEST(ParentBasedSampler, GetDescription)
{
ParentBasedSampler sampler(std::make_shared<AlwaysOffSampler>());
ASSERT_EQ("ParentBased{AlwaysOffSampler}", sampler.GetDescription());
ParentBasedSampler sampler2(std::make_shared<AlwaysOnSampler>());
ASSERT_EQ("ParentBased{AlwaysOnSampler}", sampler2.GetDescription());
}
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