// TODO: Make another constructor to accept System.Web.HttpContext for non Owin applications
/// <summary>
/// Initializes a new instance of the TraceProvider class.
/// </summary>
/// <param name="config">ZipkinConfig instance</param>
/// <param name="context">the IOwinContext</param>
internal TraceProvider(IZipkinConfig config, HttpContext context = null)
{
string headerTraceId = null;
string headerSpanId = null;
string headerParentSpanId = null;
string headerSampled = null;
string requestPath = null;
if (context != null)
{
object value = context.Items[Key];
if (value != null)
{
// set properties from context's item.
var provider = (ITraceProvider)value;
TraceId = provider.TraceId;
SpanId = provider.SpanId;
ParentSpanId = provider.ParentSpanId;
IsSampled = provider.IsSampled;
return;
}
// zipkin use the following X-Headers to propagate the trace information
headerTraceId = context.Request.Headers[TraceIdHeaderName];
headerSpanId = context.Request.Headers[SpanIdHeaderName];
headerParentSpanId = context.Request.Headers[ParentSpanIdHeaderName];
headerSampled = context.Request.Headers[SampledHeaderName];
requestPath = context.Request.Path.ToString();
}
TraceId = headerTraceId.IsParsableTo128Or64Bit() ? headerTraceId : GenerateNewTraceId(config.Create128BitTraceId);
SpanId = headerSpanId.IsParsableToLong() ? headerSpanId : GenerateHexEncodedInt64Id();
ParentSpanId = headerParentSpanId.IsParsableToLong() ? headerParentSpanId : string.Empty;
IsSampled = config.ShouldBeSampled(headerSampled, requestPath);
if (SpanId == ParentSpanId)
{
throw new ArgumentException("x-b3-SpanId and x-b3-ParentSpanId must not be the same value.");
}
context?.Items.Add(Key, this);
}
/// <summary>
/// Initializes a new instance of the TraceProvider class.
/// </summary>
/// <param name="config">ZipkinConfig instance</param>
/// <param name="context">the IOwinContext</param>
internal TraceProvider(IZipkinConfig config, IOwinContext context = null)
{
string headerTraceId = null;
string headerSpanId = null;
string headerParentSpanId = null;
string headerSampled = null;
if (context != null)
{
object value;
if (context.Environment.TryGetValue(Key, out value))
{
// set properties from context's item.
var provider = (ITraceProvider)value;
TraceId = provider.TraceId;
SpanId = provider.SpanId;
ParentSpanId = provider.ParentSpanId;
IsSampled = provider.IsSampled;
return;
}
// zipkin use the following X-Headers to propagate the trace information
headerTraceId = context.Request.Headers[TraceIdHeaderName];
headerSpanId = context.Request.Headers[SpanIdHeaderName];
headerParentSpanId = context.Request.Headers[ParentSpanIdHeaderName];
headerSampled = context.Request.Headers[SampledHeaderName];
}
TraceId = Parse(headerTraceId) ? headerTraceId : GenerateHexEncodedInt64FromNewGuid();
SpanId = Parse(headerSpanId) ? headerSpanId : TraceId;
ParentSpanId = Parse(headerParentSpanId) ? headerParentSpanId : string.Empty;
IsSampled = config.ShouldBeSampled(context, headerSampled);
if (SpanId == ParentSpanId)
{
throw new ArgumentException("x-b3-SpanId and x-b3-ParentSpanId must not be the same value.");
}
context?.Environment.Add(Key, this);
}
