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filter_traces.go
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/
filter_traces.go
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// Copyright observIQ, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package snapshot
import (
"strings"
"time"
"go.opentelemetry.io/collector/pdata/pcommon"
"go.opentelemetry.io/collector/pdata/ptrace"
)
// filterTraces filters the traces by the given query and timestamp.
// The returned payload cannot be assumed to be a copy, so it should not be modified.
func filterTraces(traces ptrace.Traces, searchQuery *string, minimumTimestamp *time.Time) ptrace.Traces {
// No filters specified, filtered traces are trivially the same as input traces
if searchQuery == nil && minimumTimestamp == nil {
return traces
}
filteredTraces := ptrace.NewTraces()
resourceSpans := traces.ResourceSpans()
for i := 0; i < resourceSpans.Len(); i++ {
filteredResourceSpans := filterResourceSpans(resourceSpans.At(i), searchQuery, minimumTimestamp)
// Don't append empty resource traces
if filteredResourceSpans.ScopeSpans().Len() != 0 {
filteredResourceSpans.MoveTo(filteredTraces.ResourceSpans().AppendEmpty())
}
}
return filteredTraces
}
func filterResourceSpans(resourceSpan ptrace.ResourceSpans, searchQuery *string, minimumTimestamp *time.Time) ptrace.ResourceSpans {
filteredResourceSpans := ptrace.NewResourceSpans()
// Copy old resource to filtered resource
resource := resourceSpan.Resource()
resource.CopyTo(filteredResourceSpans.Resource())
// Apply query to resource
queryMatchesResource := true // default to true if no query specified
if searchQuery != nil {
queryMatchesResource = queryMatchesMap(resource.Attributes(), *searchQuery)
}
scopeSpans := resourceSpan.ScopeSpans()
for i := 0; i < scopeSpans.Len(); i++ {
filteredScopeSpans := filterScopeSpans(scopeSpans.At(i), queryMatchesResource, searchQuery, minimumTimestamp)
// Don't append empty scope spans
if filteredScopeSpans.Spans().Len() != 0 {
filteredScopeSpans.MoveTo(filteredResourceSpans.ScopeSpans().AppendEmpty())
}
}
return filteredResourceSpans
}
// filterScopeSpans filters out spans that do not match the query and minimumTimestamp, returning a new ptrace.ScopeSpans without the filtered spans.
// queryMatchesResource indicates if the query string matches the resource associated with this ScopeSpans.
func filterScopeSpans(scopeSpans ptrace.ScopeSpans, queryMatchesResource bool, searchQuery *string, minimumTimestamp *time.Time) ptrace.ScopeSpans {
filteredTraceSpans := ptrace.NewScopeSpans()
spans := scopeSpans.Spans()
for i := 0; i < spans.Len(); i++ {
span := spans.At(i)
if spanMatches(span, queryMatchesResource, searchQuery, minimumTimestamp) {
span.CopyTo(filteredTraceSpans.Spans().AppendEmpty())
}
}
return filteredTraceSpans
}
// spanMatches returns true if the query matches either the resource or span, AND the min timestamp.
func spanMatches(s ptrace.Span, queryMatchesResource bool, searchQuery *string, minimumTimestamp *time.Time) bool {
queryMatchesSpan := true // default to true if no query specified
// Skip this check if we already know the query matches the resource
if !queryMatchesResource && searchQuery != nil {
queryMatchesSpan = spanMatchesQuery(s, *searchQuery)
}
timestampMatches := true // default to true if no timestamp specified
if minimumTimestamp != nil {
timestampMatches = spanMatchesTimestamp(s, *minimumTimestamp)
}
queryMatches := queryMatchesResource || queryMatchesSpan
return queryMatches && timestampMatches
}
// spanMatchesTimestamp determines if the span came after the provided timestamp
func spanMatchesTimestamp(s ptrace.Span, minTime time.Time) bool {
return s.EndTimestamp() > pcommon.NewTimestampFromTime(minTime)
}
// spanMatchesQuery determines if the given span matches the given query string
func spanMatchesQuery(span ptrace.Span, searchQuery string) bool {
return queryMatchesMap(span.Attributes(), searchQuery) ||
strings.Contains(span.Name(), searchQuery) ||
strings.Contains(span.TraceID().String(), searchQuery) ||
strings.Contains(span.SpanID().String(), searchQuery) ||
strings.Contains(span.ParentSpanID().String(), searchQuery) ||
strings.Contains(span.Kind().String(), searchQuery)
}