public void Constructs_CartOnlyRule_From_Config_String()
{
var config = "rate=0.5, service=shopping-cart.*";
var rule = RegexSamplingRule.BuildFromConfigurationString(config).Single();
Assert.True(rule.IsMatch(CartCheckoutSpan));
Assert.True(rule.IsMatch(AddToCartSpan));
Assert.False(rule.IsMatch(ShippingAuthSpan));
Assert.False(rule.IsMatch(ShippingRevertSpan));
Assert.False(rule.IsMatch(RequestShippingSpan));
}
public void Constructs_ZeroRateOnly_From_Config_String()
{
var config = "rate=0";
var rule = RegexSamplingRule.BuildFromConfigurationString(config).Single();
Assert.Equal(expected: 0, actual: rule.GetSamplingRate());
Assert.True(rule.IsMatch(CartCheckoutSpan));
Assert.True(rule.IsMatch(AddToCartSpan));
Assert.True(rule.IsMatch(ShippingAuthSpan));
Assert.True(rule.IsMatch(ShippingRevertSpan));
Assert.True(rule.IsMatch(RequestShippingSpan));
}
public void Constructs_All_Expected_From_Config_String()
{
var config = "rate=0.5, service=.*cart.*; rate=1, service=.*shipping.*, operation=authorize; rate=0.1, service=.*shipping.*; rate=0.05";
var rules = RegexSamplingRule.BuildFromConfigurationString(config).ToArray();
var cartRule = rules[0];
Assert.Equal(expected: 0.5f, actual: cartRule.GetSamplingRate());
Assert.True(cartRule.IsMatch(CartCheckoutSpan));
Assert.True(cartRule.IsMatch(AddToCartSpan));
Assert.False(cartRule.IsMatch(ShippingAuthSpan));
Assert.False(cartRule.IsMatch(ShippingRevertSpan));
Assert.False(cartRule.IsMatch(RequestShippingSpan));
var shippingAuthRule = rules[1];
Assert.Equal(expected: 1f, actual: shippingAuthRule.GetSamplingRate());
Assert.False(shippingAuthRule.IsMatch(CartCheckoutSpan));
Assert.False(shippingAuthRule.IsMatch(AddToCartSpan));
Assert.True(shippingAuthRule.IsMatch(ShippingAuthSpan));
Assert.False(shippingAuthRule.IsMatch(ShippingRevertSpan));
Assert.False(shippingAuthRule.IsMatch(RequestShippingSpan));
var fallbackShippingRule = rules[2];
Assert.Equal(expected: 0.1f, actual: fallbackShippingRule.GetSamplingRate());
Assert.False(fallbackShippingRule.IsMatch(CartCheckoutSpan));
Assert.False(fallbackShippingRule.IsMatch(AddToCartSpan));
Assert.True(fallbackShippingRule.IsMatch(ShippingAuthSpan));
Assert.True(fallbackShippingRule.IsMatch(ShippingRevertSpan));
Assert.True(fallbackShippingRule.IsMatch(RequestShippingSpan));
var fallbackRule = rules[3];
Assert.Equal(expected: 0.05f, actual: fallbackRule.GetSamplingRate());
Assert.True(fallbackRule.IsMatch(CartCheckoutSpan));
Assert.True(fallbackRule.IsMatch(AddToCartSpan));
Assert.True(fallbackRule.IsMatch(ShippingAuthSpan));
Assert.True(fallbackRule.IsMatch(ShippingRevertSpan));
Assert.True(fallbackRule.IsMatch(RequestShippingSpan));
}
internal Tracer(TracerSettings settings, IAgentWriter agentWriter, ISampler sampler, IScopeManager scopeManager, IStatsd statsd)
{
// fall back to default implementations of each dependency if not provided
Settings = settings ?? TracerSettings.FromDefaultSources();
// only set DogStatsdClient if tracer metrics are enabled
if (Settings.TracerMetricsEnabled)
{
Statsd = statsd ?? CreateDogStatsdClient(Settings);
}
IApi apiClient = new Api(Settings.AgentUri, delegatingHandler: null, Statsd);
_agentWriter = agentWriter ?? new AgentWriter(apiClient, Statsd);
_scopeManager = scopeManager ?? new AsyncLocalScopeManager();
Sampler = sampler ?? new RuleBasedSampler(new RateLimiter(Settings.MaxTracesSubmittedPerSecond));
if (!string.IsNullOrWhiteSpace(Settings.CustomSamplingRules))
{
foreach (var rule in RegexSamplingRule.BuildFromConfigurationString(Settings.CustomSamplingRules))
{
Sampler.RegisterRule(rule);
}
}
// if not configured, try to determine an appropriate service name
DefaultServiceName = Settings.ServiceName ??
GetApplicationName() ??
UnknownServiceName;
// Register callbacks to make sure we flush the traces before exiting
AppDomain.CurrentDomain.ProcessExit += CurrentDomain_ProcessExit;
AppDomain.CurrentDomain.UnhandledException += CurrentDomain_UnhandledException;
Console.CancelKeyPress += Console_CancelKeyPress;
// If configured, add/remove the correlation identifiers into the
// LibLog logging context when a scope is activated/closed
if (Settings.LogsInjectionEnabled)
{
InitializeLibLogScopeEventSubscriber(_scopeManager);
}
}