forked from cortexproject/cortex
/
compat.go
411 lines (363 loc) · 12.1 KB
/
compat.go
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package client
import (
stdjson "encoding/json"
"fmt"
"sort"
"strconv"
"strings"
"time"
"unsafe"
jsoniter "github.com/json-iterator/go"
"github.com/prometheus/common/model"
"github.com/prometheus/prometheus/pkg/labels"
"github.com/prometheus/prometheus/pkg/textparse"
"github.com/cortexproject/cortex/pkg/util"
)
var json = jsoniter.ConfigCompatibleWithStandardLibrary
// ToWriteRequest converts matched slices of Labels, Samples and Metadata into a WriteRequest proto.
// It gets timeseries from the pool, so ReuseSlice() should be called when done.
func ToWriteRequest(lbls []labels.Labels, samples []Sample, metadata []*MetricMetadata, source WriteRequest_SourceEnum) *WriteRequest {
req := &WriteRequest{
Timeseries: slicePool.Get().([]PreallocTimeseries),
Metadata: metadata,
Source: source,
}
for i, s := range samples {
ts := timeSeriesPool.Get().(*TimeSeries)
ts.Labels = append(ts.Labels, FromLabelsToLabelAdapters(lbls[i])...)
ts.Samples = append(ts.Samples, s)
req.Timeseries = append(req.Timeseries, PreallocTimeseries{TimeSeries: ts})
}
return req
}
// ToQueryRequest builds a QueryRequest proto.
func ToQueryRequest(from, to model.Time, matchers []*labels.Matcher) (*QueryRequest, error) {
ms, err := toLabelMatchers(matchers)
if err != nil {
return nil, err
}
return &QueryRequest{
StartTimestampMs: int64(from),
EndTimestampMs: int64(to),
Matchers: ms,
}, nil
}
// FromQueryRequest unpacks a QueryRequest proto.
func FromQueryRequest(req *QueryRequest) (model.Time, model.Time, []*labels.Matcher, error) {
matchers, err := fromLabelMatchers(req.Matchers)
if err != nil {
return 0, 0, nil, err
}
from := model.Time(req.StartTimestampMs)
to := model.Time(req.EndTimestampMs)
return from, to, matchers, nil
}
// ToQueryResponse builds a QueryResponse proto.
func ToQueryResponse(matrix model.Matrix) *QueryResponse {
resp := &QueryResponse{}
for _, ss := range matrix {
ts := TimeSeries{
Labels: FromMetricsToLabelAdapters(ss.Metric),
Samples: make([]Sample, 0, len(ss.Values)),
}
for _, s := range ss.Values {
ts.Samples = append(ts.Samples, Sample{
Value: float64(s.Value),
TimestampMs: int64(s.Timestamp),
})
}
resp.Timeseries = append(resp.Timeseries, ts)
}
return resp
}
// FromQueryResponse unpacks a QueryResponse proto.
func FromQueryResponse(resp *QueryResponse) model.Matrix {
m := make(model.Matrix, 0, len(resp.Timeseries))
for _, ts := range resp.Timeseries {
var ss model.SampleStream
ss.Metric = FromLabelAdaptersToMetric(ts.Labels)
ss.Values = make([]model.SamplePair, 0, len(ts.Samples))
for _, s := range ts.Samples {
ss.Values = append(ss.Values, model.SamplePair{
Value: model.SampleValue(s.Value),
Timestamp: model.Time(s.TimestampMs),
})
}
m = append(m, &ss)
}
return m
}
// ToMetricsForLabelMatchersRequest builds a MetricsForLabelMatchersRequest proto
func ToMetricsForLabelMatchersRequest(from, to model.Time, matchers []*labels.Matcher) (*MetricsForLabelMatchersRequest, error) {
ms, err := toLabelMatchers(matchers)
if err != nil {
return nil, err
}
return &MetricsForLabelMatchersRequest{
StartTimestampMs: int64(from),
EndTimestampMs: int64(to),
MatchersSet: []*LabelMatchers{{Matchers: ms}},
}, nil
}
// FromMetricsForLabelMatchersRequest unpacks a MetricsForLabelMatchersRequest proto
func FromMetricsForLabelMatchersRequest(req *MetricsForLabelMatchersRequest) (model.Time, model.Time, [][]*labels.Matcher, error) {
matchersSet := make([][]*labels.Matcher, 0, len(req.MatchersSet))
for _, matchers := range req.MatchersSet {
matchers, err := fromLabelMatchers(matchers.Matchers)
if err != nil {
return 0, 0, nil, err
}
matchersSet = append(matchersSet, matchers)
}
from := model.Time(req.StartTimestampMs)
to := model.Time(req.EndTimestampMs)
return from, to, matchersSet, nil
}
// FromMetricsForLabelMatchersResponse unpacks a MetricsForLabelMatchersResponse proto
func FromMetricsForLabelMatchersResponse(resp *MetricsForLabelMatchersResponse) []model.Metric {
metrics := []model.Metric{}
for _, m := range resp.Metric {
metrics = append(metrics, FromLabelAdaptersToMetric(m.Labels))
}
return metrics
}
// MetricMetadataMetricTypeToMetricType converts a metric type from our internal client
// to a Prometheus one.
func MetricMetadataMetricTypeToMetricType(mt MetricMetadata_MetricType) textparse.MetricType {
switch mt {
case UNKNOWN:
return textparse.MetricTypeUnknown
case COUNTER:
return textparse.MetricTypeCounter
case GAUGE:
return textparse.MetricTypeGauge
case HISTOGRAM:
return textparse.MetricTypeHistogram
case GAUGEHISTOGRAM:
return textparse.MetricTypeGaugeHistogram
case SUMMARY:
return textparse.MetricTypeSummary
case INFO:
return textparse.MetricTypeInfo
case STATESET:
return textparse.MetricTypeStateset
default:
return textparse.MetricTypeUnknown
}
}
func toLabelMatchers(matchers []*labels.Matcher) ([]*LabelMatcher, error) {
result := make([]*LabelMatcher, 0, len(matchers))
for _, matcher := range matchers {
var mType MatchType
switch matcher.Type {
case labels.MatchEqual:
mType = EQUAL
case labels.MatchNotEqual:
mType = NOT_EQUAL
case labels.MatchRegexp:
mType = REGEX_MATCH
case labels.MatchNotRegexp:
mType = REGEX_NO_MATCH
default:
return nil, fmt.Errorf("invalid matcher type")
}
result = append(result, &LabelMatcher{
Type: mType,
Name: string(matcher.Name),
Value: string(matcher.Value),
})
}
return result, nil
}
func fromLabelMatchers(matchers []*LabelMatcher) ([]*labels.Matcher, error) {
result := make([]*labels.Matcher, 0, len(matchers))
for _, matcher := range matchers {
var mtype labels.MatchType
switch matcher.Type {
case EQUAL:
mtype = labels.MatchEqual
case NOT_EQUAL:
mtype = labels.MatchNotEqual
case REGEX_MATCH:
mtype = labels.MatchRegexp
case REGEX_NO_MATCH:
mtype = labels.MatchNotRegexp
default:
return nil, fmt.Errorf("invalid matcher type")
}
matcher, err := labels.NewMatcher(mtype, matcher.Name, matcher.Value)
if err != nil {
return nil, err
}
result = append(result, matcher)
}
return result, nil
}
// FromLabelAdaptersToLabels casts []LabelAdapter to labels.Labels.
// It uses unsafe, but as LabelAdapter == labels.Label this should be safe.
// This allows us to use labels.Labels directly in protos.
//
// Note: while resulting labels.Labels is supposedly sorted, this function
// doesn't enforce that. If input is not sorted, output will be wrong.
func FromLabelAdaptersToLabels(ls []LabelAdapter) labels.Labels {
return *(*labels.Labels)(unsafe.Pointer(&ls))
}
// FromLabelAdaptersToLabelsWithCopy converts []LabelAdapter to labels.Labels.
// Do NOT use unsafe to convert between data types because this function may
// get in input labels whose data structure is reused.
func FromLabelAdaptersToLabelsWithCopy(input []LabelAdapter) labels.Labels {
return CopyLabels(FromLabelAdaptersToLabels(input))
}
// Efficiently copies labels input slice. To be used in cases where input slice
// can be reused, but long-term copy is needed.
func CopyLabels(input []labels.Label) labels.Labels {
result := make(labels.Labels, len(input))
size := 0
for _, l := range input {
size += len(l.Name)
size += len(l.Value)
}
// Copy all strings into the buffer, and use 'yoloString' to convert buffer
// slices to strings.
buf := make([]byte, size)
for i, l := range input {
result[i].Name, buf = copyStringToBuffer(l.Name, buf)
result[i].Value, buf = copyStringToBuffer(l.Value, buf)
}
return result
}
// Copies string to buffer (which must be big enough), and converts buffer slice containing
// the string copy into new string.
func copyStringToBuffer(in string, buf []byte) (string, []byte) {
l := len(in)
c := copy(buf, in)
if c != l {
panic("not copied full string")
}
return yoloString(buf[0:l]), buf[l:]
}
// FromLabelsToLabelAdapters casts labels.Labels to []LabelAdapter.
// It uses unsafe, but as LabelAdapter == labels.Label this should be safe.
// This allows us to use labels.Labels directly in protos.
func FromLabelsToLabelAdapters(ls labels.Labels) []LabelAdapter {
return *(*[]LabelAdapter)(unsafe.Pointer(&ls))
}
// FromLabelAdaptersToMetric converts []LabelAdapter to a model.Metric.
// Don't do this on any performance sensitive paths.
func FromLabelAdaptersToMetric(ls []LabelAdapter) model.Metric {
return util.LabelsToMetric(FromLabelAdaptersToLabels(ls))
}
// FromMetricsToLabelAdapters converts model.Metric to []LabelAdapter.
// Don't do this on any performance sensitive paths.
// The result is sorted.
func FromMetricsToLabelAdapters(metric model.Metric) []LabelAdapter {
result := make([]LabelAdapter, 0, len(metric))
for k, v := range metric {
result = append(result, LabelAdapter{
Name: string(k),
Value: string(v),
})
}
sort.Sort(byLabel(result)) // The labels should be sorted upon initialisation.
return result
}
type byLabel []LabelAdapter
func (s byLabel) Len() int { return len(s) }
func (s byLabel) Less(i, j int) bool { return strings.Compare(s[i].Name, s[j].Name) < 0 }
func (s byLabel) Swap(i, j int) { s[i], s[j] = s[j], s[i] }
// FastFingerprint runs the same algorithm as Prometheus labelSetToFastFingerprint()
func FastFingerprint(ls []LabelAdapter) model.Fingerprint {
if len(ls) == 0 {
return model.Metric(nil).FastFingerprint()
}
var result uint64
for _, l := range ls {
sum := hashNew()
sum = hashAdd(sum, l.Name)
sum = hashAddByte(sum, model.SeparatorByte)
sum = hashAdd(sum, l.Value)
result ^= sum
}
return model.Fingerprint(result)
}
// Fingerprint runs the same algorithm as Prometheus labelSetToFingerprint()
func Fingerprint(labels labels.Labels) model.Fingerprint {
sum := hashNew()
for _, label := range labels {
sum = hashAddString(sum, label.Name)
sum = hashAddByte(sum, model.SeparatorByte)
sum = hashAddString(sum, label.Value)
sum = hashAddByte(sum, model.SeparatorByte)
}
return model.Fingerprint(sum)
}
// LabelsToKeyString is used to form a string to be used as
// the hashKey. Don't print, use l.String() for printing.
func LabelsToKeyString(l labels.Labels) string {
// We are allocating 1024, even though most series are less than 600b long.
// But this is not an issue as this function is being inlined when called in a loop
// and buffer allocated is a static buffer and not a dynamic buffer on the heap.
b := make([]byte, 0, 1024)
return string(l.Bytes(b))
}
// MarshalJSON implements json.Marshaler.
func (s Sample) MarshalJSON() ([]byte, error) {
t, err := json.Marshal(model.Time(s.TimestampMs))
if err != nil {
return nil, err
}
v, err := json.Marshal(model.SampleValue(s.Value))
if err != nil {
return nil, err
}
return []byte(fmt.Sprintf("[%s,%s]", t, v)), nil
}
// UnmarshalJSON implements json.Unmarshaler.
func (s *Sample) UnmarshalJSON(b []byte) error {
var t model.Time
var v model.SampleValue
vs := [...]stdjson.Unmarshaler{&t, &v}
if err := json.Unmarshal(b, &vs); err != nil {
return err
}
s.TimestampMs = int64(t)
s.Value = float64(v)
return nil
}
func init() {
jsoniter.RegisterTypeEncoderFunc("client.Sample", func(ptr unsafe.Pointer, stream *jsoniter.Stream) {
sample := (*Sample)(ptr)
stream.WriteArrayStart()
stream.WriteFloat64(float64(sample.TimestampMs) / float64(time.Second/time.Millisecond))
stream.WriteMore()
stream.WriteString(model.SampleValue(sample.Value).String())
stream.WriteArrayEnd()
}, func(unsafe.Pointer) bool {
return false
})
jsoniter.RegisterTypeDecoderFunc("client.Sample", func(ptr unsafe.Pointer, iter *jsoniter.Iterator) {
if !iter.ReadArray() {
iter.ReportError("client.Sample", "expected [")
return
}
t := model.Time(iter.ReadFloat64() * float64(time.Second/time.Millisecond))
if !iter.ReadArray() {
iter.ReportError("client.Sample", "expected ,")
return
}
bs := iter.ReadStringAsSlice()
ss := *(*string)(unsafe.Pointer(&bs))
v, err := strconv.ParseFloat(ss, 64)
if err != nil {
iter.ReportError("client.Sample", err.Error())
return
}
if iter.ReadArray() {
iter.ReportError("client.Sample", "expected ]")
}
*(*Sample)(ptr) = Sample{
TimestampMs: int64(t),
Value: v,
}
})
}