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stream.go
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stream.go
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// Copyright 2019, 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
//
// 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 cloudfoundryreceiver // import "github.com/open-telemetry/opentelemetry-collector-contrib/receiver/cloudfoundryreceiver"
import (
"context"
"errors"
"fmt"
"net/http"
"strings"
"code.cloudfoundry.org/go-loggregator"
"code.cloudfoundry.org/go-loggregator/rpc/loggregator_v2"
"go.opentelemetry.io/collector/component"
"go.opentelemetry.io/collector/config/confighttp"
"go.uber.org/zap"
)
type EnvelopeStreamFactory struct {
rlpGatewayClient *loggregator.RLPGatewayClient
}
func newEnvelopeStreamFactory(
settings component.TelemetrySettings,
authTokenProvider *UAATokenProvider,
httpConfig confighttp.HTTPClientSettings,
host component.Host) (*EnvelopeStreamFactory, error) {
httpClient, err := httpConfig.ToClient(host, settings)
if err != nil {
return nil, fmt.Errorf("creating HTTP client for Cloud Foundry RLP Gateway: %w", err)
}
gatewayClient := loggregator.NewRLPGatewayClient(httpConfig.Endpoint,
loggregator.WithRLPGatewayClientLogger(zap.NewStdLog(settings.Logger)),
loggregator.WithRLPGatewayHTTPClient(&authorizationProvider{
logger: settings.Logger,
authTokenProvider: authTokenProvider,
client: httpClient,
}),
)
return &EnvelopeStreamFactory{gatewayClient}, nil
}
func (rgc *EnvelopeStreamFactory) CreateStream(
ctx context.Context,
shardID string) (loggregator.EnvelopeStream, error) {
if strings.TrimSpace(shardID) == "" {
return nil, errors.New("shardID cannot be empty")
}
stream := rgc.rlpGatewayClient.Stream(ctx, &loggregator_v2.EgressBatchRequest{
ShardId: shardID,
Selectors: []*loggregator_v2.Selector{
{
Message: &loggregator_v2.Selector_Counter{
Counter: &loggregator_v2.CounterSelector{},
},
},
{
Message: &loggregator_v2.Selector_Gauge{
Gauge: &loggregator_v2.GaugeSelector{},
},
},
},
})
return stream, nil
}
type authorizationProvider struct {
logger *zap.Logger
authTokenProvider *UAATokenProvider
client *http.Client
}
func (ap *authorizationProvider) Do(request *http.Request) (*http.Response, error) {
token, err := ap.authTokenProvider.ProvideToken()
if err == nil {
request.Header.Set("Authorization", token)
} else {
ap.logger.Error("fetching authentication token", zap.Error(err))
return nil, errors.New("obtaining authentication token for the request")
}
return ap.client.Do(request)
}