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ocastore.go
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ocastore.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://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 internal
import (
"context"
"errors"
"io"
"sync"
"sync/atomic"
"github.com/prometheus/prometheus/pkg/labels"
"github.com/prometheus/prometheus/scrape"
"github.com/prometheus/prometheus/storage"
"go.uber.org/zap"
"go.opentelemetry.io/collector/component/componenterror"
"go.opentelemetry.io/collector/consumer"
)
const (
runningStateInit = iota
runningStateReady
runningStateStop
)
var idSeq int64
var noop = &noopAppender{}
// OcaStore is an interface combines io.Closer and prometheus' scrape.Appendable
type OcaStore interface {
scrape.Appendable
io.Closer
SetScrapeManager(*scrape.Manager)
}
// OpenCensus Store for prometheus
type ocaStore struct {
running int32
logger *zap.Logger
sink consumer.MetricsConsumerOld
mc *mService
once *sync.Once
ctx context.Context
jobsMap *JobsMap
useStartTimeMetric bool
receiverName string
}
// NewOcaStore returns an ocaStore instance, which can be acted as prometheus' scrape.Appendable
func NewOcaStore(ctx context.Context, sink consumer.MetricsConsumerOld, logger *zap.Logger, jobsMap *JobsMap, useStartTimeMetric bool, receiverName string) OcaStore {
return &ocaStore{
running: runningStateInit,
ctx: ctx,
sink: sink,
logger: logger,
once: &sync.Once{},
jobsMap: jobsMap,
useStartTimeMetric: useStartTimeMetric,
receiverName: receiverName,
}
}
// SetScrapeManager is used to config the underlying scrape.Manager as it's needed for OcaStore, otherwise OcaStore
// cannot accept any Appender() request
func (o *ocaStore) SetScrapeManager(scrapeManager *scrape.Manager) {
if scrapeManager != nil && atomic.CompareAndSwapInt32(&o.running, runningStateInit, runningStateReady) {
o.mc = &mService{sm: scrapeManager}
}
}
func (o *ocaStore) Appender() (storage.Appender, error) {
state := atomic.LoadInt32(&o.running)
if state == runningStateReady {
return newTransaction(o.ctx, o.jobsMap, o.useStartTimeMetric, o.receiverName, o.mc, o.sink, o.logger), nil
} else if state == runningStateInit {
return nil, errors.New("ScrapeManager is not set")
}
// instead of returning an error, return a dummy appender instead, otherwise it can trigger panic
return noop, nil
}
func (o *ocaStore) Close() error {
atomic.CompareAndSwapInt32(&o.running, runningStateReady, runningStateStop)
return nil
}
// noopAppender, always return error on any operations
type noopAppender struct{}
func (*noopAppender) Add(l labels.Labels, t int64, v float64) (uint64, error) {
return 0, componenterror.ErrAlreadyStopped
}
func (*noopAppender) AddFast(l labels.Labels, ref uint64, t int64, v float64) error {
return componenterror.ErrAlreadyStopped
}
func (*noopAppender) Commit() error {
return componenterror.ErrAlreadyStopped
}
func (*noopAppender) Rollback() error {
return nil
}