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router.go
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router.go
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// 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 routingprocessor // import "github.com/open-telemetry/opentelemetry-collector-contrib/processor/routingprocessor"
import (
"errors"
"fmt"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/config"
"go.uber.org/zap"
"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/telemetryquerylanguage/contexts/tqllogs"
"github.com/open-telemetry/opentelemetry-collector-contrib/pkg/telemetryquerylanguage/tql"
"github.com/open-telemetry/opentelemetry-collector-contrib/processor/routingprocessor/internal/common"
)
var errExporterNotFound = errors.New("exporter not found")
// router registers exporters and default exporters for an exporter. router can
// be instantiated with component.TracesExporter, component.MetricsExporter, and
// component.LogsExporter type arguments.
type router[E component.Exporter] struct {
logger *zap.Logger
parser tql.Parser
defaultExporterIDs []string
table []RoutingTableItem
defaultExporters []E
routes map[string]routingItem[E]
}
// newRouter creates a new router instance with its type parameter constrained
// to component.Exporter.
func newRouter[E component.Exporter](
table []RoutingTableItem,
defaultExporterIDs []string,
logger *zap.Logger,
) router[E] {
return router[E]{
logger: logger,
parser: tql.NewParser(
common.Functions(),
tqllogs.ParsePath,
tqllogs.ParseEnum,
common.NewOTTLLogger(logger),
),
table: table,
defaultExporterIDs: defaultExporterIDs,
routes: make(map[string]routingItem[E]),
}
}
type routingItem[E component.Exporter] struct {
exporters []E
expression tql.Query
}
func (r *router[E]) registerExporters(available map[config.ComponentID]component.Exporter) error {
// register default exporters
err := r.registerDefaultExporters(available)
if err != nil {
return err
}
// register exporters for each route
err = r.registerRouteExporters(available)
if err != nil {
return err
}
return nil
}
// registerDefaultExporters registers the configured default exporters
// using the provided available exporters map.
func (r *router[E]) registerDefaultExporters(available map[config.ComponentID]component.Exporter) error {
for _, name := range r.defaultExporterIDs {
e, err := r.extractExporter(name, available)
if errors.Is(err, errExporterNotFound) {
continue
}
if err != nil {
return err
}
r.defaultExporters = append(r.defaultExporters, e)
}
return nil
}
// registerRouteExporters registers route exporters using the provided
// available exporters map to check if they were available.
func (r *router[E]) registerRouteExporters(available map[config.ComponentID]component.Exporter) error {
for _, item := range r.table {
e, err := r.routingExpression(item)
if err != nil {
return err
}
route, ok := r.routes[key(item)]
if !ok {
route.expression = e
}
for _, name := range item.Exporters {
e, err := r.extractExporter(name, available)
if errors.Is(err, errExporterNotFound) {
continue
}
if err != nil {
return err
}
route.exporters = append(route.exporters, e)
}
r.routes[key(item)] = route
}
return nil
}
// routingExpression builds a routing OTTL expressions from provided
// routing table entry configuration. If routing table entry configuration
// does not contain a OTTL expressions then nil is returned.
func (r *router[E]) routingExpression(item RoutingTableItem) (tql.Query, error) {
var e tql.Query
if item.Expression != "" {
queries, err := r.parser.ParseQueries([]string{item.Expression})
if err != nil {
return e, err
}
if len(queries) != 1 {
return e, errors.New("more than one expression specified")
}
e = queries[0]
}
return e, nil
}
func key(entry RoutingTableItem) string {
if entry.Value != "" {
return entry.Value
}
return entry.Expression
}
// extractExporter returns an exporter for the given name (type/name) and type
// argument if it exists in the list of available exporters.
func (r *router[E]) extractExporter(name string, available map[config.ComponentID]component.Exporter) (E, error) {
var exporter E
id, err := config.NewComponentIDFromString(name)
if err != nil {
return exporter, err
}
v, ok := available[id]
if !ok {
r.logger.Warn(
"Can't find the exporter for the routing processor for this pipeline type."+
" This is OK if you did not specify this processor for that pipeline type",
zap.Any("pipeline_type", new(E)),
zap.Error(
fmt.Errorf(
"error registering exporter %q",
name,
),
),
)
return exporter, errExporterNotFound
}
exporter, ok = v.(E)
if !ok {
return exporter,
fmt.Errorf("the exporter %q isn't a %T exporter", id.String(), new(E))
}
return exporter, nil
}
func (r *router[E]) getExporters(key string) []E {
e, ok := r.routes[key]
if !ok {
return r.defaultExporters
}
return e.exporters
}