/
labels_codec.go
432 lines (378 loc) · 12.2 KB
/
labels_codec.go
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// Copyright (c) The Thanos Authors.
// Licensed under the Apache License 2.0.
package queryfrontend
import (
"bytes"
"context"
"encoding/json"
"io/ioutil"
"math"
"net/http"
"net/url"
"sort"
"strconv"
"strings"
"time"
"github.com/cortexproject/cortex/pkg/querier/queryrange"
cortexutil "github.com/cortexproject/cortex/pkg/util"
"github.com/cortexproject/cortex/pkg/util/spanlogger"
"github.com/opentracing/opentracing-go"
otlog "github.com/opentracing/opentracing-go/log"
"github.com/prometheus/prometheus/model/timestamp"
"github.com/weaveworks/common/httpgrpc"
queryv1 "github.com/thanos-io/thanos/pkg/api/query"
"github.com/thanos-io/thanos/pkg/store/labelpb"
)
var (
infMinTime = time.Unix(math.MinInt64/1000+62135596801, 0)
infMaxTime = time.Unix(math.MaxInt64/1000-62135596801, 999999999)
)
// labelsCodec is used to encode/decode Thanos labels and series requests and responses.
type labelsCodec struct {
queryrange.Codec
partialResponse bool
defaultMetadataTimeRange time.Duration
}
// NewThanosLabelsCodec initializes a labelsCodec.
func NewThanosLabelsCodec(partialResponse bool, defaultMetadataTimeRange time.Duration) *labelsCodec {
return &labelsCodec{
Codec: queryrange.PrometheusCodec,
partialResponse: partialResponse,
defaultMetadataTimeRange: defaultMetadataTimeRange,
}
}
// MergeResponse merges multiple responses into a single Response. It needs to dedup the responses and ensure the order.
func (c labelsCodec) MergeResponse(responses ...queryrange.Response) (queryrange.Response, error) {
if len(responses) == 0 {
// Empty response for label_names, label_values and series API.
return &ThanosLabelsResponse{
Status: queryrange.StatusSuccess,
Data: []string{},
}, nil
}
switch responses[0].(type) {
case *ThanosLabelsResponse:
if len(responses) == 1 {
return responses[0], nil
}
set := make(map[string]struct{})
for _, res := range responses {
for _, value := range res.(*ThanosLabelsResponse).Data {
if _, ok := set[value]; !ok {
set[value] = struct{}{}
}
}
}
lbls := make([]string, 0, len(set))
for label := range set {
lbls = append(lbls, label)
}
sort.Strings(lbls)
return &ThanosLabelsResponse{
Status: queryrange.StatusSuccess,
Data: lbls,
}, nil
case *ThanosSeriesResponse:
seriesData := make(labelpb.ZLabelSets, 0)
uniqueSeries := make(map[string]struct{})
for _, res := range responses {
for _, series := range res.(*ThanosSeriesResponse).Data {
s := series.PromLabels().String()
if _, ok := uniqueSeries[s]; !ok {
seriesData = append(seriesData, series)
uniqueSeries[s] = struct{}{}
}
}
}
sort.Sort(seriesData)
return &ThanosSeriesResponse{
Status: queryrange.StatusSuccess,
Data: seriesData,
}, nil
default:
return nil, httpgrpc.Errorf(http.StatusInternalServerError, "invalid response format")
}
}
func (c labelsCodec) DecodeRequest(_ context.Context, r *http.Request, forwardHeaders []string) (queryrange.Request, error) {
if err := r.ParseForm(); err != nil {
return nil, httpgrpc.Errorf(http.StatusBadRequest, err.Error())
}
var (
req queryrange.Request
err error
)
switch op := getOperation(r); op {
case labelNamesOp, labelValuesOp:
req, err = c.parseLabelsRequest(r, op, forwardHeaders)
case seriesOp:
req, err = c.parseSeriesRequest(r, forwardHeaders)
}
if err != nil {
return nil, err
}
return req, nil
}
func (c labelsCodec) EncodeRequest(ctx context.Context, r queryrange.Request) (*http.Request, error) {
var req *http.Request
var err error
switch thanosReq := r.(type) {
case *ThanosLabelsRequest:
var params = url.Values{
"start": []string{encodeTime(thanosReq.Start)},
"end": []string{encodeTime(thanosReq.End)},
queryv1.PartialResponseParam: []string{strconv.FormatBool(thanosReq.PartialResponse)},
}
if len(thanosReq.Matchers) > 0 {
params[queryv1.MatcherParam] = matchersToStringSlice(thanosReq.Matchers)
}
if len(thanosReq.StoreMatchers) > 0 {
params[queryv1.StoreMatcherParam] = matchersToStringSlice(thanosReq.StoreMatchers)
}
if strings.Contains(thanosReq.Path, "/api/v1/label/") {
u := &url.URL{
Path: thanosReq.Path,
RawQuery: params.Encode(),
}
req = &http.Request{
Method: http.MethodGet,
RequestURI: u.String(), // This is what the httpgrpc code looks at.
URL: u,
Body: http.NoBody,
Header: http.Header{},
}
} else {
req, err = http.NewRequest(http.MethodPost, thanosReq.Path, bytes.NewBufferString(params.Encode()))
if err != nil {
return nil, httpgrpc.Errorf(http.StatusBadRequest, "error creating request: %s", err.Error())
}
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
}
for _, hv := range thanosReq.Headers {
for _, v := range hv.Values {
req.Header.Add(hv.Name, v)
}
}
case *ThanosSeriesRequest:
var params = url.Values{
"start": []string{encodeTime(thanosReq.Start)},
"end": []string{encodeTime(thanosReq.End)},
queryv1.DedupParam: []string{strconv.FormatBool(thanosReq.Dedup)},
queryv1.PartialResponseParam: []string{strconv.FormatBool(thanosReq.PartialResponse)},
queryv1.ReplicaLabelsParam: thanosReq.ReplicaLabels,
}
if len(thanosReq.Matchers) > 0 {
params[queryv1.MatcherParam] = matchersToStringSlice(thanosReq.Matchers)
}
if len(thanosReq.StoreMatchers) > 0 {
params[queryv1.StoreMatcherParam] = matchersToStringSlice(thanosReq.StoreMatchers)
}
req, err = http.NewRequest(http.MethodPost, thanosReq.Path, bytes.NewBufferString(params.Encode()))
if err != nil {
return nil, httpgrpc.Errorf(http.StatusBadRequest, "error creating request: %s", err.Error())
}
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
for _, hv := range thanosReq.Headers {
for _, v := range hv.Values {
req.Header.Add(hv.Name, v)
}
}
default:
return nil, httpgrpc.Errorf(http.StatusInternalServerError, "invalid request format")
}
return req.WithContext(ctx), nil
}
func (c labelsCodec) DecodeResponse(ctx context.Context, r *http.Response, req queryrange.Request) (queryrange.Response, error) {
if r.StatusCode/100 != 2 {
body, _ := ioutil.ReadAll(r.Body)
return nil, httpgrpc.Errorf(r.StatusCode, string(body))
}
log, _ := spanlogger.New(ctx, "ParseQueryResponse") //nolint:ineffassign,staticcheck
defer log.Finish()
buf, err := ioutil.ReadAll(r.Body)
if err != nil {
log.Error(err) //nolint:errcheck
return nil, httpgrpc.Errorf(http.StatusInternalServerError, "error decoding response: %v", err)
}
log.LogFields(otlog.Int("bytes", len(buf)))
switch req.(type) {
case *ThanosLabelsRequest:
var resp ThanosLabelsResponse
if err := json.Unmarshal(buf, &resp); err != nil {
return nil, httpgrpc.Errorf(http.StatusInternalServerError, "error decoding response: %v", err)
}
for h, hv := range r.Header {
resp.Headers = append(resp.Headers, &ResponseHeader{Name: h, Values: hv})
}
return &resp, nil
case *ThanosSeriesRequest:
var resp ThanosSeriesResponse
if err := json.Unmarshal(buf, &resp); err != nil {
return nil, httpgrpc.Errorf(http.StatusInternalServerError, "error decoding response: %v", err)
}
for h, hv := range r.Header {
resp.Headers = append(resp.Headers, &ResponseHeader{Name: h, Values: hv})
}
return &resp, nil
default:
return nil, httpgrpc.Errorf(http.StatusInternalServerError, "invalid request type")
}
}
func (c labelsCodec) EncodeResponse(ctx context.Context, res queryrange.Response) (*http.Response, error) {
sp, _ := opentracing.StartSpanFromContext(ctx, "APIResponse.ToHTTPResponse")
defer sp.Finish()
var (
b []byte
err error
)
switch resp := res.(type) {
case *ThanosLabelsResponse:
sp.LogFields(otlog.Int("labels", len(resp.Data)))
b, err = json.Marshal(resp)
if err != nil {
return nil, httpgrpc.Errorf(http.StatusInternalServerError, "error encoding response: %v", err)
}
case *ThanosSeriesResponse:
sp.LogFields(otlog.Int("series", len(resp.Data)))
b, err = json.Marshal(resp)
if err != nil {
return nil, httpgrpc.Errorf(http.StatusInternalServerError, "error encoding response: %v", err)
}
default:
return nil, httpgrpc.Errorf(http.StatusInternalServerError, "invalid response format")
}
sp.LogFields(otlog.Int("bytes", len(b)))
resp := http.Response{
Header: http.Header{
"Content-Type": []string{"application/json"},
},
Body: ioutil.NopCloser(bytes.NewBuffer(b)),
StatusCode: http.StatusOK,
}
return &resp, nil
}
func (c labelsCodec) parseLabelsRequest(r *http.Request, op string, forwardHeaders []string) (queryrange.Request, error) {
var (
result ThanosLabelsRequest
err error
)
result.Start, result.End, err = parseMetadataTimeRange(r, c.defaultMetadataTimeRange)
if err != nil {
return nil, err
}
result.Matchers, err = parseMatchersParam(r.Form, queryv1.MatcherParam)
if err != nil {
return nil, err
}
result.PartialResponse, err = parsePartialResponseParam(r.FormValue(queryv1.PartialResponseParam), c.partialResponse)
if err != nil {
return nil, err
}
result.StoreMatchers, err = parseMatchersParam(r.Form, queryv1.StoreMatcherParam)
if err != nil {
return nil, err
}
result.Path = r.URL.Path
if op == labelValuesOp {
parts := strings.Split(r.URL.Path, "/")
if len(parts) > 1 {
result.Label = parts[len(parts)-2]
}
}
for _, value := range r.Header.Values(cacheControlHeader) {
if strings.Contains(value, noStoreValue) {
result.CachingOptions.Disabled = true
break
}
}
// Include the specified headers from http request in prometheusRequest.
for _, header := range forwardHeaders {
for h, hv := range r.Header {
if strings.EqualFold(h, header) {
result.Headers = append(result.Headers, &RequestHeader{Name: h, Values: hv})
break
}
}
}
return &result, nil
}
func (c labelsCodec) parseSeriesRequest(r *http.Request, forwardHeaders []string) (queryrange.Request, error) {
var (
result ThanosSeriesRequest
err error
)
result.Start, result.End, err = parseMetadataTimeRange(r, c.defaultMetadataTimeRange)
if err != nil {
return nil, err
}
result.Matchers, err = parseMatchersParam(r.Form, queryv1.MatcherParam)
if err != nil {
return nil, err
}
result.Dedup, err = parseEnableDedupParam(r.FormValue(queryv1.DedupParam))
if err != nil {
return nil, err
}
result.PartialResponse, err = parsePartialResponseParam(r.FormValue(queryv1.PartialResponseParam), c.partialResponse)
if err != nil {
return nil, err
}
if len(r.Form[queryv1.ReplicaLabelsParam]) > 0 {
result.ReplicaLabels = r.Form[queryv1.ReplicaLabelsParam]
}
result.StoreMatchers, err = parseMatchersParam(r.Form, queryv1.StoreMatcherParam)
if err != nil {
return nil, err
}
result.Path = r.URL.Path
for _, value := range r.Header.Values(cacheControlHeader) {
if strings.Contains(value, noStoreValue) {
result.CachingOptions.Disabled = true
break
}
}
// Include the specified headers from http request in prometheusRequest.
for _, header := range forwardHeaders {
for h, hv := range r.Header {
if strings.EqualFold(h, header) {
result.Headers = append(result.Headers, &RequestHeader{Name: h, Values: hv})
break
}
}
}
return &result, nil
}
func parseMetadataTimeRange(r *http.Request, defaultMetadataTimeRange time.Duration) (int64, int64, error) {
// If start and end time not specified as query parameter, we get the range from the beginning of time by default.
var defaultStartTime, defaultEndTime time.Time
if defaultMetadataTimeRange == 0 {
defaultStartTime = infMinTime
defaultEndTime = infMaxTime
} else {
now := time.Now()
defaultStartTime = now.Add(-defaultMetadataTimeRange)
defaultEndTime = now
}
start, err := parseTimeParam(r, "start", defaultStartTime)
if err != nil {
return 0, 0, err
}
end, err := parseTimeParam(r, "end", defaultEndTime)
if err != nil {
return 0, 0, err
}
if end < start {
return 0, 0, errEndBeforeStart
}
return start, end, nil
}
func parseTimeParam(r *http.Request, paramName string, defaultValue time.Time) (int64, error) {
val := r.FormValue(paramName)
if val == "" {
return timestamp.FromTime(defaultValue), nil
}
result, err := cortexutil.ParseTime(val)
if err != nil {
return 0, err
}
return result, nil
}