// https://github.com/DataDog/datadog-agent/blob/eac2327c5574da7f225f9ef0f89eaeb05ed10382/pkg/trace/traceutil/normalize.go#L39-L55
internal static string NormalizeName(string name)
{
if (string.IsNullOrEmpty(name))
{
Log.Debug("Fixing malformed trace. Name is empty (reason:span_name_empty), setting span.name={name}.", name);
return(DefaultSpanName);
}
if (TraceUtil.TruncateUTF8(ref name, MaxNameLen))
{
Log.Debug <int>("Fixing malformed trace. Name is too long (reason:span_name_truncate), truncating span.name to length={maxServiceLen}.", MaxNameLen);
}
name = TraceUtil.NormalizeMetricName(name, MaxNameLen);
if (name is null)
{
name = DefaultSpanName;
}
return(name);
}
public Span Process(Span span)
{
// https://github.com/DataDog/datadog-agent/blob/eac2327c5574da7f225f9ef0f89eaeb05ed10382/pkg/trace/agent/normalizer.go#L51-L63
span.ServiceName = NormalizeService(span.ServiceName);
// https://github.com/DataDog/datadog-agent/blob/eac2327c5574da7f225f9ef0f89eaeb05ed10382/pkg/trace/agent/normalizer.go#L76-L87
span.OperationName = NormalizeName(span.OperationName);
// https://github.com/DataDog/datadog-agent/blob/eac2327c5574da7f225f9ef0f89eaeb05ed10382/pkg/trace/agent/normalizer.go#L89-L93
if (string.IsNullOrEmpty(span.ResourceName))
{
Log.Debug("Fixing malformed trace. Resource is empty (reason:resource_empty), setting span.resource={name}: {span}", span.OperationName, span);
span.ResourceName = span.OperationName;
}
// https://github.com/DataDog/datadog-agent/blob/eac2327c5574da7f225f9ef0f89eaeb05ed10382/pkg/trace/agent/normalizer.go#L95-L99
// The validation for ParentID == TraceID == SpanID is not required
// This is done by the agent for zipkin support.
// This scenario is very unlikely to happen in an official tracer implementation.
// https://github.com/DataDog/datadog-agent/blob/eac2327c5574da7f225f9ef0f89eaeb05ed10382/pkg/trace/agent/normalizer.go#L108-L112
if (span.Duration < TimeSpan.Zero)
{
Log.Debug("Fixing malformed trace. Duration is invalid (reason:invalid_duration), setting span.duration=0: {span}", span.OperationName, span);
span.SetDuration(TimeSpan.Zero);
}
// https://github.com/DataDog/datadog-agent/blob/eac2327c5574da7f225f9ef0f89eaeb05ed10382/pkg/trace/agent/normalizer.go#L113-L117
if (span.Duration.ToNanoseconds() > long.MaxValue - span.StartTime.ToUnixTimeNanoseconds())
{
Log.Debug("Fixing malformed trace. Duration is too large and causes overflow (reason:invalid_duration), setting span.duration=0: {span}", span.OperationName, span);
span.SetDuration(TimeSpan.Zero);
}
// https://github.com/DataDog/datadog-agent/blob/eac2327c5574da7f225f9ef0f89eaeb05ed10382/pkg/trace/agent/normalizer.go#L118-L126
if (span.StartTime < Year2000Time)
{
Log.Debug("Fixing malformed trace. Start date is invalid (reason:invalid_start_date), setting span.start=time.now(): {span}", span);
var now = span.Context.TraceContext.UtcNow;
var start = now - span.Duration;
if (start.ToUnixTimeNanoseconds() < 0)
{
start = now;
}
span.SetStartTime(start);
}
// https://github.com/DataDog/datadog-agent/blob/eac2327c5574da7f225f9ef0f89eaeb05ed10382/pkg/trace/agent/normalizer.go#L128-L132
var type = span.Type;
if (TraceUtil.TruncateUTF8(ref type, MaxTypeLen))
{
span.Type = type;
Log.Debug("Fixing malformed trace. Type is too long (reason:type_truncate), truncating span.type to length={maxServiceLen}: {span}", MaxTypeLen, span);
}
// https://github.com/DataDog/datadog-agent/blob/eac2327c5574da7f225f9ef0f89eaeb05ed10382/pkg/trace/agent/normalizer.go#L133-L135
if (span.Tags is CommonTags commonTags)
{
commonTags.Environment = TraceUtil.NormalizeTag(commonTags.Environment);
}
else
{
string env = span.GetTag("env");
if (!string.IsNullOrEmpty(env))
{
span.SetTag("env", TraceUtil.NormalizeTag(env));
}
}
// https://github.com/DataDog/datadog-agent/blob/eac2327c5574da7f225f9ef0f89eaeb05ed10382/pkg/trace/agent/normalizer.go#L136-L142
if (span.Tags is IHasStatusCode statusCodeTags)
{
if (!TraceUtil.IsValidStatusCode(statusCodeTags.HttpStatusCode))
{
Log.Debug("Fixing malformed trace. HTTP status code is invalid (reason:invalid_http_status_code), dropping invalid http.status_code={invalidStatusCode}: {span}", statusCodeTags.HttpStatusCode, span);
statusCodeTags.HttpStatusCode = string.Empty;
}
}
else
{
string httpStatusCode = span.GetTag(Tags.HttpStatusCode);
if (!string.IsNullOrEmpty(httpStatusCode) && !TraceUtil.IsValidStatusCode(httpStatusCode))
{
Log.Debug("Fixing malformed trace. HTTP status code is invalid (reason:invalid_http_status_code), dropping invalid http.status_code={invalidStatusCode}: {span}", httpStatusCode, span);
span.SetTag(Tags.HttpStatusCode, null);
}
}
return(span);
}