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// Copyright The Prometheus 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 storage
import (
"context"
"errors"
"log/slog"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/model/exemplar"
"github.com/prometheus/prometheus/model/histogram"
"github.com/prometheus/prometheus/model/labels"
"github.com/prometheus/prometheus/model/metadata"
)
type fanout struct {
logger *slog.Logger
primary Storage
secondaries []Storage
}
// NewFanout returns a new fanout Storage, which proxies reads and writes
// through to multiple underlying storages.
//
// The difference between primary and secondary Storage is only for read (Querier) path and it goes as follows:
// * If the primary querier returns an error, then any of the Querier operations will fail.
// * If any secondary querier returns an error the result from that queries is discarded. The overall operation will succeed,
// and the error from the secondary querier will be returned as a warning.
//
// NOTE: In the case of Prometheus, it treats all remote storages as secondary / best effort.
func NewFanout(logger *slog.Logger, primary Storage, secondaries ...Storage) Storage {
return &fanout{
logger: logger,
primary: primary,
secondaries: secondaries,
}
}
// StartTime implements the Storage interface.
func (f *fanout) StartTime() (int64, error) {
// StartTime of a fanout should be the earliest StartTime of all its storages,
// both primary and secondaries.
firstTime, err := f.primary.StartTime()
if err != nil {
return int64(model.Latest), err
}
for _, s := range f.secondaries {
t, err := s.StartTime()
if err != nil {
return int64(model.Latest), err
}
if t < firstTime {
firstTime = t
}
}
return firstTime, nil
}
func (f *fanout) Querier(mint, maxt int64) (Querier, error) {
primary, err := f.primary.Querier(mint, maxt)
if err != nil {
return nil, err
}
secondaries := make([]Querier, 0, len(f.secondaries))
for _, storage := range f.secondaries {
querier, err := storage.Querier(mint, maxt)
if err != nil {
// Close already open Queriers, append potential errors to returned error.
errs := []error{
err,
primary.Close(),
}
for _, q := range secondaries {
errs = append(errs, q.Close())
}
return nil, errors.Join(errs...)
}
if _, ok := querier.(noopQuerier); !ok {
secondaries = append(secondaries, querier)
}
}
return NewMergeQuerier([]Querier{primary}, secondaries, ChainedSeriesMerge), nil
}
func (f *fanout) ChunkQuerier(mint, maxt int64) (ChunkQuerier, error) {
primary, err := f.primary.ChunkQuerier(mint, maxt)
if err != nil {
return nil, err
}
secondaries := make([]ChunkQuerier, 0, len(f.secondaries))
for _, storage := range f.secondaries {
querier, err := storage.ChunkQuerier(mint, maxt)
if err != nil {
// Close already open Queriers, append potential errors to returned error.
errs := []error{
err,
primary.Close(),
}
for _, q := range secondaries {
errs = append(errs, q.Close())
}
return nil, errors.Join(errs...)
}
secondaries = append(secondaries, querier)
}
return NewMergeChunkQuerier([]ChunkQuerier{primary}, secondaries, NewCompactingChunkSeriesMerger(ChainedSeriesMerge)), nil
}
func (f *fanout) Appender(ctx context.Context) Appender {
primary := f.primary.Appender(ctx)
secondaries := make([]Appender, 0, len(f.secondaries))
for _, storage := range f.secondaries {
secondaries = append(secondaries, storage.Appender(ctx))
}
return &fanoutAppender{
logger: f.logger,
primary: primary,
secondaries: secondaries,
}
}
func (f *fanout) AppenderV2(ctx context.Context) AppenderV2 {
primary := f.primary.AppenderV2(ctx)
secondaries := make([]AppenderV2, 0, len(f.secondaries))
for _, storage := range f.secondaries {
secondaries = append(secondaries, storage.AppenderV2(ctx))
}
return &fanoutAppenderV2{
logger: f.logger,
primary: primary,
secondaries: secondaries,
}
}
// Close closes the storage and all its underlying resources.
func (f *fanout) Close() error {
errs := []error{
f.primary.Close(),
}
for _, s := range f.secondaries {
errs = append(errs, s.Close())
}
return errors.Join(errs...)
}
// fanoutAppender implements Appender.
type fanoutAppender struct {
logger *slog.Logger
primary Appender
secondaries []Appender
}
// SetOptions propagates the hints to both primary and secondary appenders.
func (f *fanoutAppender) SetOptions(opts *AppendOptions) {
if f.primary != nil {
f.primary.SetOptions(opts)
}
for _, appender := range f.secondaries {
appender.SetOptions(opts)
}
}
func (f *fanoutAppender) Append(ref SeriesRef, l labels.Labels, t int64, v float64) (SeriesRef, error) {
ref, err := f.primary.Append(ref, l, t, v)
if err != nil {
return ref, err
}
for _, appender := range f.secondaries {
if _, err := appender.Append(ref, l, t, v); err != nil {
return 0, err
}
}
return ref, nil
}
func (f *fanoutAppender) AppendExemplar(ref SeriesRef, l labels.Labels, e exemplar.Exemplar) (SeriesRef, error) {
ref, err := f.primary.AppendExemplar(ref, l, e)
if err != nil {
return ref, err
}
for _, appender := range f.secondaries {
if _, err := appender.AppendExemplar(ref, l, e); err != nil {
return 0, err
}
}
return ref, nil
}
func (f *fanoutAppender) AppendHistogram(ref SeriesRef, l labels.Labels, t int64, h *histogram.Histogram, fh *histogram.FloatHistogram) (SeriesRef, error) {
ref, err := f.primary.AppendHistogram(ref, l, t, h, fh)
if err != nil {
return ref, err
}
for _, appender := range f.secondaries {
if _, err := appender.AppendHistogram(ref, l, t, h, fh); err != nil {
return 0, err
}
}
return ref, nil
}
func (f *fanoutAppender) AppendHistogramSTZeroSample(ref SeriesRef, l labels.Labels, t, st int64, h *histogram.Histogram, fh *histogram.FloatHistogram) (SeriesRef, error) {
ref, err := f.primary.AppendHistogramSTZeroSample(ref, l, t, st, h, fh)
if err != nil {
return ref, err
}
for _, appender := range f.secondaries {
if _, err := appender.AppendHistogramSTZeroSample(ref, l, t, st, h, fh); err != nil {
return 0, err
}
}
return ref, nil
}
func (f *fanoutAppender) UpdateMetadata(ref SeriesRef, l labels.Labels, m metadata.Metadata) (SeriesRef, error) {
ref, err := f.primary.UpdateMetadata(ref, l, m)
if err != nil {
return ref, err
}
for _, appender := range f.secondaries {
if _, err := appender.UpdateMetadata(ref, l, m); err != nil {
return 0, err
}
}
return ref, nil
}
func (f *fanoutAppender) AppendSTZeroSample(ref SeriesRef, l labels.Labels, t, st int64) (SeriesRef, error) {
ref, err := f.primary.AppendSTZeroSample(ref, l, t, st)
if err != nil {
return ref, err
}
for _, appender := range f.secondaries {
if _, err := appender.AppendSTZeroSample(ref, l, t, st); err != nil {
return 0, err
}
}
return ref, nil
}
func (f *fanoutAppender) Commit() (err error) {
err = f.primary.Commit()
for _, appender := range f.secondaries {
if err == nil {
err = appender.Commit()
} else {
if rollbackErr := appender.Rollback(); rollbackErr != nil {
f.logger.Error("Squashed rollback error on commit", "err", rollbackErr)
}
}
}
return err
}
func (f *fanoutAppender) Rollback() (err error) {
err = f.primary.Rollback()
for _, appender := range f.secondaries {
rollbackErr := appender.Rollback()
switch {
case err == nil:
err = rollbackErr
case rollbackErr != nil:
f.logger.Error("Squashed rollback error on rollback", "err", rollbackErr)
}
}
return err
}
type fanoutAppenderV2 struct {
logger *slog.Logger
primary AppenderV2
secondaries []AppenderV2
}
func (f *fanoutAppenderV2) Append(ref SeriesRef, l labels.Labels, st, t int64, v float64, h *histogram.Histogram, fh *histogram.FloatHistogram, opts AOptions) (SeriesRef, error) {
var partialErr *AppendPartialError
ref, err := f.primary.Append(ref, l, st, t, v, h, fh, opts)
partialErr, err = partialErr.Handle(err)
if err != nil {
return ref, err
}
for _, appender := range f.secondaries {
_, serr := appender.Append(ref, l, st, t, v, h, fh, opts)
partialErr, serr = partialErr.Handle(serr)
if serr != nil {
return ref, serr
}
}
return ref, partialErr.ToError()
}
func (f *fanoutAppenderV2) Commit() (err error) {
err = f.primary.Commit()
for _, appender := range f.secondaries {
if err == nil {
err = appender.Commit()
} else {
if rollbackErr := appender.Rollback(); rollbackErr != nil {
f.logger.Error("Squashed rollback error on commit", "err", rollbackErr)
}
}
}
return err
}
func (f *fanoutAppenderV2) Rollback() (err error) {
err = f.primary.Rollback()
for _, appender := range f.secondaries {
rollbackErr := appender.Rollback()
switch {
case err == nil:
err = rollbackErr
case rollbackErr != nil:
f.logger.Error("Squashed rollback error on rollback", "err", rollbackErr)
}
}
return err
}