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error_translate_queryable.go
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/
error_translate_queryable.go
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// SPDX-License-Identifier: AGPL-3.0-only
// Provenance-includes-location: https://github.com/cortexproject/cortex/blob/master/pkg/querier/error_translate_queryable.go
// Provenance-includes-license: Apache-2.0
// Provenance-includes-copyright: The Cortex Authors.
package querier
import (
"context"
"net/http"
"github.com/grafana/dskit/grpcutil"
"github.com/pkg/errors"
"github.com/prometheus/prometheus/model/labels"
"github.com/prometheus/prometheus/promql"
"github.com/prometheus/prometheus/storage"
"github.com/prometheus/prometheus/util/annotations"
"github.com/grafana/mimir/pkg/mimirpb"
"github.com/grafana/mimir/pkg/util"
"github.com/grafana/mimir/pkg/util/validation"
)
// TranslateToPromqlAPIError converts error to one of promql.Errors for consumption in PromQL API.
// PromQL API only recognizes few errors, and converts everything else to HTTP status code 422.
//
// Specifically, it supports:
//
// promql.ErrQueryCanceled, mapped to 499
// promql.ErrQueryTimeout, mapped to 503
// promql.ErrStorage mapped to 500
// anything else is mapped to 422
//
// Querier code produces different kinds of errors, and we want to map them to above-mentioned HTTP status codes correctly.
//
// Details:
// - vendor/github.com/prometheus/prometheus/web/api/v1/api.go, respondError function only accepts *apiError types.
// - translation of error to *apiError happens in vendor/github.com/prometheus/prometheus/web/api/v1/api.go, returnAPIError method.
func TranslateToPromqlAPIError(err error) error {
if err == nil {
return err
}
var (
errStorage promql.ErrStorage
errTooManySamples promql.ErrTooManySamples
errQueryCanceled promql.ErrQueryCanceled
errQueryTimeout promql.ErrQueryTimeout
)
switch {
case errors.As(err, &errStorage) || errors.As(err, &errTooManySamples) || errors.As(err, &errQueryCanceled) || errors.As(err, &errQueryTimeout):
// Don't translate those, just in case we use them internally.
return err
case validation.IsLimitError(err):
// This will be returned with status code 422 by Prometheus API.
return err
default:
if errors.Is(err, context.Canceled) {
return err // 499
}
if s, ok := grpcutil.ErrorToStatus(err); ok {
code := s.Code()
if util.IsHTTPStatusCode(code) {
// Treat these as HTTP status codes, even though they are supposed to be grpc codes.
if code >= 400 && code < 500 {
// Return directly, will be mapped to 422
return err
} else if code == http.StatusServiceUnavailable {
return promql.ErrQueryTimeout(s.Message())
}
}
details := s.Details()
if len(details) == 1 {
if errorDetails, ok := details[0].(*mimirpb.ErrorDetails); ok {
switch errorDetails.GetCause() {
case mimirpb.TOO_BUSY:
return promql.ErrQueryTimeout(s.Message())
}
}
}
}
// All other errors will be returned as 500.
return promql.ErrStorage{Err: err}
}
}
// ErrTranslateFn is used to translate or wrap error before returning it by functions in
// storage.SampleAndChunkQueryable interface.
// Input error may be nil.
type ErrTranslateFn func(err error) error
func NewErrorTranslateQueryableWithFn(q storage.Queryable, fn ErrTranslateFn) storage.Queryable {
return errorTranslateQueryable{q: q, fn: fn}
}
func NewErrorTranslateSampleAndChunkQueryable(q storage.SampleAndChunkQueryable) storage.SampleAndChunkQueryable {
return NewErrorTranslateSampleAndChunkQueryableWithFn(q, TranslateToPromqlAPIError)
}
func NewErrorTranslateSampleAndChunkQueryableWithFn(q storage.SampleAndChunkQueryable, fn ErrTranslateFn) storage.SampleAndChunkQueryable {
return errorTranslateSampleAndChunkQueryable{q: q, fn: fn}
}
type errorTranslateQueryable struct {
q storage.Queryable
fn ErrTranslateFn
}
func (e errorTranslateQueryable) Querier(mint, maxt int64) (storage.Querier, error) {
q, err := e.q.Querier(mint, maxt)
return errorTranslateQuerier{q: q, fn: e.fn}, e.fn(err)
}
type errorTranslateSampleAndChunkQueryable struct {
q storage.SampleAndChunkQueryable
fn ErrTranslateFn
}
func (e errorTranslateSampleAndChunkQueryable) Querier(mint, maxt int64) (storage.Querier, error) {
q, err := e.q.Querier(mint, maxt)
return errorTranslateQuerier{q: q, fn: e.fn}, e.fn(err)
}
func (e errorTranslateSampleAndChunkQueryable) ChunkQuerier(mint, maxt int64) (storage.ChunkQuerier, error) {
q, err := e.q.ChunkQuerier(mint, maxt)
return errorTranslateChunkQuerier{q: q, fn: e.fn}, e.fn(err)
}
type errorTranslateQuerier struct {
q storage.Querier
fn ErrTranslateFn
}
func (e errorTranslateQuerier) LabelValues(ctx context.Context, name string, matchers ...*labels.Matcher) ([]string, annotations.Annotations, error) {
values, warnings, err := e.q.LabelValues(ctx, name, matchers...)
return values, warnings, e.fn(err)
}
func (e errorTranslateQuerier) LabelNames(ctx context.Context, matchers ...*labels.Matcher) ([]string, annotations.Annotations, error) {
values, warnings, err := e.q.LabelNames(ctx, matchers...)
return values, warnings, e.fn(err)
}
func (e errorTranslateQuerier) Close() error {
return e.fn(e.q.Close())
}
func (e errorTranslateQuerier) Select(ctx context.Context, sortSeries bool, hints *storage.SelectHints, matchers ...*labels.Matcher) storage.SeriesSet {
s := e.q.Select(ctx, sortSeries, hints, matchers...)
return errorTranslateSeriesSet{s: s, fn: e.fn}
}
type errorTranslateChunkQuerier struct {
q storage.ChunkQuerier
fn ErrTranslateFn
}
func (e errorTranslateChunkQuerier) LabelValues(ctx context.Context, name string, matchers ...*labels.Matcher) ([]string, annotations.Annotations, error) {
values, warnings, err := e.q.LabelValues(ctx, name, matchers...)
return values, warnings, e.fn(err)
}
func (e errorTranslateChunkQuerier) LabelNames(ctx context.Context, matchers ...*labels.Matcher) ([]string, annotations.Annotations, error) {
values, warnings, err := e.q.LabelNames(ctx, matchers...)
return values, warnings, e.fn(err)
}
func (e errorTranslateChunkQuerier) Close() error {
return e.fn(e.q.Close())
}
func (e errorTranslateChunkQuerier) Select(ctx context.Context, sortSeries bool, hints *storage.SelectHints, matchers ...*labels.Matcher) storage.ChunkSeriesSet {
s := e.q.Select(ctx, sortSeries, hints, matchers...)
return errorTranslateChunkSeriesSet{s: s, fn: e.fn}
}
type errorTranslateSeriesSet struct {
s storage.SeriesSet
fn ErrTranslateFn
}
func (e errorTranslateSeriesSet) Next() bool {
return e.s.Next()
}
func (e errorTranslateSeriesSet) At() storage.Series {
return e.s.At()
}
func (e errorTranslateSeriesSet) Err() error {
return e.fn(e.s.Err())
}
func (e errorTranslateSeriesSet) Warnings() annotations.Annotations {
return e.s.Warnings()
}
type errorTranslateChunkSeriesSet struct {
s storage.ChunkSeriesSet
fn ErrTranslateFn
}
func (e errorTranslateChunkSeriesSet) Next() bool {
return e.s.Next()
}
func (e errorTranslateChunkSeriesSet) At() storage.ChunkSeries {
return e.s.At()
}
func (e errorTranslateChunkSeriesSet) Err() error {
return e.fn(e.s.Err())
}
func (e errorTranslateChunkSeriesSet) Warnings() annotations.Annotations {
return e.s.Warnings()
}