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processor.go
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processor.go
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// 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 k8sprocessor
import (
"context"
"go.opentelemetry.io/collector/client"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/consumer"
"go.opentelemetry.io/collector/consumer/pdata"
"go.uber.org/zap"
"github.com/open-telemetry/opentelemetry-collector-contrib/internal/common/k8sconfig"
"github.com/open-telemetry/opentelemetry-collector-contrib/processor/k8sprocessor/kube"
)
const (
k8sIPLabelName string = "k8s.pod.ip"
clientIPLabelName string = "ip"
)
type kubernetesprocessor struct {
logger *zap.Logger
apiConfig k8sconfig.APIConfig
nextConsumer consumer.TraceConsumer
kc kube.Client
passthroughMode bool
rules kube.ExtractionRules
filters kube.Filters
}
var _ (component.TraceProcessor) = (*kubernetesprocessor)(nil)
// NewTraceProcessor returns a component.TraceProcessorOld that adds the WithAttributeMap(attributes) to all spans
// passed to it.
func NewTraceProcessor(
logger *zap.Logger,
nextConsumer consumer.TraceConsumer,
kubeClient kube.ClientProvider,
options ...Option,
) (component.TraceProcessor, error) {
kp := &kubernetesprocessor{logger: logger, nextConsumer: nextConsumer}
for _, opt := range options {
if err := opt(kp); err != nil {
return nil, err
}
}
if kubeClient == nil {
kubeClient = kube.New
}
if !kp.passthroughMode {
kc, err := kubeClient(logger, kp.apiConfig, kp.rules, kp.filters, nil, nil)
if err != nil {
return nil, err
}
kp.kc = kc
}
return kp, nil
}
func (kp *kubernetesprocessor) GetCapabilities() component.ProcessorCapabilities {
return component.ProcessorCapabilities{MutatesConsumedData: true}
}
func (kp *kubernetesprocessor) Start(_ context.Context, _ component.Host) error {
if !kp.passthroughMode {
go kp.kc.Start()
}
return nil
}
func (kp *kubernetesprocessor) Shutdown(context.Context) error {
if !kp.passthroughMode {
kp.kc.Stop()
}
return nil
}
func (kp *kubernetesprocessor) ConsumeTraces(ctx context.Context, td pdata.Traces) error {
rss := td.ResourceSpans()
kp.logger.Info("received rss len: ", zap.Int("size", rss.Len()))
for i := 0; i < rss.Len(); i++ {
rs := rss.At(i)
if rs.IsNil() {
continue
}
var podIP string
resource := rs.Resource()
// check if the application, a collector/agent or a prior processor has already
// annotated the batch with IP.
if !resource.IsNil() {
podIP = kp.k8sIPFromAttributes(resource.Attributes())
}
// Check if the receiver detected client IP.
if podIP == "" {
if c, ok := client.FromContext(ctx); ok {
podIP = c.IP
}
}
if podIP != "" {
if resource.IsNil() {
resource.InitEmpty()
}
resource.Attributes().InsertString(k8sIPLabelName, podIP)
}
// Don't invoke any k8s client functionality in passthrough mode.
// Just tag the IP and forward the batch.
if kp.passthroughMode {
continue
}
// add k8s tags to resource
attrsToAdd := kp.getAttributesForPodIP(podIP)
if len(attrsToAdd) == 0 {
continue
}
if resource.IsNil() {
resource.InitEmpty()
}
attrs := resource.Attributes()
for k, v := range attrsToAdd {
attrs.InsertString(k, v)
}
}
return kp.nextConsumer.ConsumeTraces(ctx, td)
}
func (kp *kubernetesprocessor) getAttributesForPodIP(ip string) map[string]string {
pod, ok := kp.kc.GetPodByIP(ip)
if !ok {
return nil
}
return pod.Attributes
}
func (kp *kubernetesprocessor) k8sIPFromAttributes(attrs pdata.AttributeMap) string {
ip := stringAttributeFromMap(attrs, k8sIPLabelName)
if ip == "" {
ip = stringAttributeFromMap(attrs, clientIPLabelName)
}
return ip
}
func stringAttributeFromMap(attrs pdata.AttributeMap, key string) string {
if val, ok := attrs.Get(key); ok {
if val.Type() == pdata.AttributeValueSTRING {
return val.StringVal()
}
}
return ""
}