Log Support in Attribute Processor (2/2) (#1934)

This complements the trace span support already present.

It shares the same config struct to maintain backwards-compatibility with spans in the cleanest way possible.

processor/attributesprocessor/attributes_log.go

@@ -0,0 +1,99 @@
+// Copyright The OpenTelemetry Authors
+//
+// 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:https://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 attributesprocessor
+
+import (
+ "context"
+
+ "go.opentelemetry.io/collector/consumer/pdata"
+ "go.opentelemetry.io/collector/internal/processor/filterlog"
+ "go.opentelemetry.io/collector/processor/processorhelper"
+)
+
+type logAttributesProcessor struct {
+ attrProc *processorhelper.AttrProc
+ include filterlog.Matcher
+ exclude filterlog.Matcher
+}
+
+// newLogAttributesProcessor returns a processor that modifies attributes of a
+// log record. To construct the attributes processors, the use of the factory
+// methods are required in order to validate the inputs.
+func newLogAttributesProcessor(attrProc *processorhelper.AttrProc, include, exclude filterlog.Matcher) *logAttributesProcessor {
+ return &logAttributesProcessor{
+ attrProc: attrProc,
+ include: include,
+ exclude: exclude,
+ }
+}
+
+// ProcessLogs implements the LogsProcessor
+func (a *logAttributesProcessor) ProcessLogs(_ context.Context, ld pdata.Logs) (pdata.Logs, error) {
+ rls := ld.ResourceLogs()
+ for i := 0; i < rls.Len(); i++ {
+ rs := rls.At(i)
+ if rs.IsNil() {
+ continue
+ }
+ ilss := rs.InstrumentationLibraryLogs()
+ resource := rs.Resource()
+ for j := 0; j < ilss.Len(); j++ {
+ ils := ilss.At(j)
+ if ils.IsNil() {
+ continue
+ }
+ logs := ils.Logs()
+ library := ils.InstrumentationLibrary()
+ for k := 0; k < logs.Len(); k++ {
+ lr := logs.At(k)
+ if lr.IsNil() {
+ // Do not create empty log records just to add attributes
+ continue
+ }
+
+ if a.skipLog(lr, resource, library) {
+ continue
+ }
+
+ a.attrProc.Process(lr.Attributes())
+ }
+ }
+ }
+ return ld, nil
+}
+
+// skipLog determines if a log should be processed.
+// True is returned when a log should be skipped.
+// False is returned when a log should not be skipped.
+// The logic determining if a log should be processed is set
+// in the attribute configuration with the include and exclude settings.
+// Include properties are checked before exclude settings are checked.
+func (a *logAttributesProcessor) skipLog(lr pdata.LogRecord, resource pdata.Resource, library pdata.InstrumentationLibrary) bool {
+ if a.include != nil {
+ // A false returned in this case means the log should not be processed.
+ if include := a.include.MatchLogRecord(lr, resource, library); !include {
+ return true
+ }
+ }
+
+ if a.exclude != nil {
+ // A true returned in this case means the log should not be processed.
+ if exclude := a.exclude.MatchLogRecord(lr, resource, library); exclude {
+ return true
+ }
+ }
+
+ return false
+}