[sumologicexporter] Add extrapolation of source headers

exporter/sumologicexporter/exporter.go

@@ -25,7 +25,8 @@ import (
 )
 
 type sumologicexporter struct {
-	config *Config
+	config  *Config
+	sources sourceFormats
 }
 
 func initExporter(cfg *Config) (*sumologicexporter, error) {
@@ -56,8 +57,14 @@ func initExporter(cfg *Config) (*sumologicexporter, error) {
 		return nil, errors.New("endpoint is not set")
 	}
 
+	sfs, err := newSourceFormats(cfg)
+	if err != nil {
+		return nil, err
+	}
+
 	se := &sumologicexporter{
-		config: cfg,
+		config:  cfg,
+		sources: sfs,
 	}
 
 	return se, nil

exporter/sumologicexporter/fields.go

@@ -0,0 +1,35 @@
+// Copyright 2020 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://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 sumologicexporter
+
+import (
+	"fmt"
+	"sort"
+	"strings"
+)
+
+// fields represents metadata
+type fields map[string]string
+
+// string returns fields as ordered key=value string with `, ` as separator
+func (f fields) string() string {
+	rv := make([]string, 0, len(f))
+	for k, v := range f {
+		rv = append(rv, fmt.Sprintf("%s=%s", k, v))
+	}
+	sort.Strings(rv)
+
+	return strings.Join(rv, ", ")
+}

exporter/sumologicexporter/fields_test.go

@@ -0,0 +1,32 @@
+// Copyright 2020 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://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 sumologicexporter
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+func TestFieldsAsString(t *testing.T) {
+	expected := "key1=value1, key2=value2, key3=value3"
+	flds := fields{
+		"key1": "value1",
+		"key3": "value3",
+		"key2": "value2",
+	}
+
+	assert.Equal(t, expected, flds.string())
+}

exporter/sumologicexporter/filter.go

@@ -15,10 +15,7 @@
 package sumologicexporter
 
 import (
-	"fmt"
 	"regexp"
-	"sort"
-	"strings"
 
 	"go.opentelemetry.io/collector/consumer/pdata"
 	tracetranslator "go.opentelemetry.io/collector/translator/trace"
@@ -28,9 +25,6 @@ type filter struct {
 	regexes []*regexp.Regexp
 }
 
-// fields represents concatenated metadata
-type fields string
-
 func newFilter(flds []string) (filter, error) {
 	metadataRegexes := make([]*regexp.Regexp, len(flds))
 
@@ -48,9 +42,9 @@ func newFilter(flds []string) (filter, error) {
 	}, nil
 }
 
-// filterIn returns map of strings which matches at least one of the filter regexes
-func (f *filter) filterIn(attributes pdata.AttributeMap) map[string]string {
-	returnValue := make(map[string]string)
+// filterIn returns fields which match at least one of the filter regexes
+func (f *filter) filterIn(attributes pdata.AttributeMap) fields {
+	returnValue := make(fields)
 
 	attributes.ForEach(func(k string, v pdata.AttributeValue) {
 		for _, regex := range f.regexes {
@@ -63,9 +57,9 @@ func (f *filter) filterIn(attributes pdata.AttributeMap) map[string]string {
 	return returnValue
 }
 
-// filterOut returns map of strings which doesn't match any of the filter regexes
-func (f *filter) filterOut(attributes pdata.AttributeMap) map[string]string {
-	returnValue := make(map[string]string)
+// filterOut returns fields which don't match any of the filter regexes
+func (f *filter) filterOut(attributes pdata.AttributeMap) fields {
+	returnValue := make(fields)
 
 	attributes.ForEach(func(k string, v pdata.AttributeValue) {
 		for _, regex := range f.regexes {
@@ -77,16 +71,3 @@ func (f *filter) filterOut(attributes pdata.AttributeMap) map[string]string {
 	})
 	return returnValue
 }
-
-// getMetadata builds string which represents metadata in alphabetical order
-func (f *filter) getMetadata(attributes pdata.AttributeMap) fields {
-	attrs := f.filterIn(attributes)
-	metadata := make([]string, 0, len(attrs))
-
-	for k, v := range attrs {
-		metadata = append(metadata, fmt.Sprintf("%s=%s", k, v))
-	}
-	sort.Strings(metadata)
-
-	return fields(strings.Join(metadata, ", "))
-}

exporter/sumologicexporter/filter_test.go

@@ -34,8 +34,8 @@ func TestGetMetadata(t *testing.T) {
 	f, err := newFilter(regexes)
 	require.NoError(t, err)
 
-	metadata := f.getMetadata(attributes)
-	const expected fields = "key1=value1, key2=value2, key3=value3"
+	metadata := f.filterIn(attributes)
+	expected := fields{"key1": "value1", "key2": "value2", "key3": "value3"}
 	assert.Equal(t, expected, metadata)
 }
 
@@ -52,7 +52,7 @@ func TestFilterOutMetadata(t *testing.T) {
 	require.NoError(t, err)
 
 	data := f.filterOut(attributes)
-	expected := map[string]string{
+	expected := fields{
 		"additional_key2": "value2",
 		"additional_key3": "value3",
 	}

exporter/sumologicexporter/sender.go

@@ -36,11 +36,12 @@ type appendResponse struct {
 }
 
 type sender struct {
-	buffer []pdata.LogRecord
-	config *Config
-	client *http.Client
-	filter filter
-	ctx    context.Context
+	buffer  []pdata.LogRecord
+	config  *Config
+	client  *http.Client
+	filter  filter
+	ctx     context.Context
+	sources sourceFormats
 }
 
 const (
@@ -55,17 +56,25 @@ func newAppendResponse() appendResponse {
 	}
 }
 
-func newSender(ctx context.Context, cfg *Config, cl *http.Client, f filter) *sender {
+func newSender(
+	ctx context.Context,
+	cfg *Config,
+	cl *http.Client,
+	f filter,
+	s sourceFormats,
+) *sender {
 	return &sender{
-		config: cfg,
-		client: cl,
-		filter: f,
-		ctx:    ctx,
+		config:  cfg,
+		client:  cl,
+		filter:  f,
+		ctx:     ctx,
+		sources: s,
 	}
 }
 
 // send sends data to sumologic
 func (s *sender) send(pipeline PipelineType, body io.Reader, flds fields) error {
+
 	// Add headers
 	req, err := http.NewRequestWithContext(s.ctx, http.MethodPost, s.config.HTTPClientSettings.Endpoint, body)
 	if err != nil {
@@ -74,22 +83,22 @@ func (s *sender) send(pipeline PipelineType, body io.Reader, flds fields) error
 
 	req.Header.Add("X-Sumo-Client", s.config.Client)
 
-	if len(s.config.SourceHost) > 0 {
-		req.Header.Add("X-Sumo-Host", s.config.SourceHost)
+	if s.sources.host.isSet() {
+		req.Header.Add("X-Sumo-Host", s.sources.host.format(flds))
 	}
 
-	if len(s.config.SourceName) > 0 {
-		req.Header.Add("X-Sumo-Name", s.config.SourceName)
+	if s.sources.name.isSet() {
+		req.Header.Add("X-Sumo-Name", s.sources.name.format(flds))
 	}
 
-	if len(s.config.SourceCategory) > 0 {
-		req.Header.Add("X-Sumo-Category", s.config.SourceCategory)
+	if s.sources.category.isSet() {
+		req.Header.Add("X-Sumo-Category", s.sources.category.format(flds))
 	}
 
 	switch pipeline {
 	case LogsPipeline:
 		req.Header.Add("Content-Type", "application/x-www-form-urlencoded")
-		req.Header.Add("X-Sumo-Fields", string(flds))
+		req.Header.Add("X-Sumo-Fields", flds.string())
 	case MetricsPipeline:
 		// ToDo: Implement metrics pipeline
 		return errors.New("current sender version doesn't support metrics")