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remote_write_proxy.go
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/
remote_write_proxy.go
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package writeproxy
import (
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"strings"
"time"
"github.com/golang/snappy"
"github.com/grafana/mimir/pkg/mimirpb"
"github.com/go-kit/log/level"
"github.com/grafana/mimir/pkg/util/spanlogger"
"github.com/grafana/mimir-proxies/pkg/errorx"
"github.com/grafana/metrictank/schema"
"github.com/grafana/metrictank/schema/msg"
graphiteAuth "github.com/grafana/mimir-proxies/pkg/graphite/authentication"
"github.com/grafana/mimir-proxies/pkg/remotewrite"
)
type RemoteWriteProxy struct {
client remotewrite.Client
recorder Recorder
}
func NewRemoteWriteProxy(client remotewrite.Client, recorder Recorder) *RemoteWriteProxy {
return &RemoteWriteProxy{
client: client,
recorder: recorder,
}
}
const (
contentTypeMetricBinary = "rt-metric-binary"
contentTypeMetricBinarySnappy = "rt-metric-binary-snappy"
contentTypeApplicationJSON = "application/json"
)
type remoteWriteResponse struct {
Published int `json:"published"`
}
func (wp *RemoteWriteProxy) ServeHTTP(w http.ResponseWriter, r *http.Request) {
log, _ := spanlogger.New(r.Context(), "graphiteWriter.ServeHTTP")
startTime := time.Now()
defer log.Span.Finish()
ctx, userID := graphiteAuth.ExtractOrgID(r.Context())
metrics, err := extractMetricsFromRequest(r)
if err != nil {
var unsupportedMediaType errorx.UnsupportedMediaType
if errors.As(err, &unsupportedMediaType) {
level.Info(log).Log("msg", "failed to parse content-type", "err", unsupportedMediaType.Error())
http.Error(w, unsupportedMediaType.Error(), unsupportedMediaType.HTTPStatusCode())
return
}
wp.recorder.measureRejectedSamples(userID, "cant_parse_body")
level.Error(log).Log("msg", "failed to parse metrics from body", "err", err)
http.Error(w, fmt.Sprintf("failed to parse metrics from body: %s", err), http.StatusBadRequest)
return
}
// Counting the request and number of samples before validation.
wp.recorder.measureIncomingRequest(userID)
wp.recorder.measureIncomingSamples(userID, len(metrics))
var firstValidationError error
for _, metric := range metrics {
metricDataDefaults(metric)
var validateErr error
if validateErr = metric.Validate(); validateErr != nil {
if firstValidationError == nil {
firstValidationError = validateErr
}
wp.recorder.measureRejectedSamples(userID,
strings.ReplaceAll(validateErr.Error(), " ", "_"))
}
}
if firstValidationError != nil {
level.Error(log).Log("msg", "invalid metric data received", "err", firstValidationError)
http.Error(w, fmt.Sprintf("invalid metric data received: %s", firstValidationError), http.StatusBadRequest)
return
}
beforeConversion := time.Now()
series, err := MetricDataPayload(metrics).GeneratePreallocTimeseries(ctx)
if err != nil {
level.Error(log).Log("msg", "failed to generate prometheus series from metric payload", "err", err)
http.Error(w, fmt.Sprintf("failed to generate prometheus series from metric payload: %s", err), http.StatusBadRequest)
return
}
wp.recorder.measureConversionDuration(userID, time.Since(beforeConversion))
req := mimirpb.WriteRequest{
Timeseries: series,
SkipLabelNameValidation: true,
}
defer mimirpb.ReuseSlice(req.Timeseries)
err = wp.client.Write(ctx, &req)
if err != nil {
if errors.As(err, &errorx.RateLimited{}) {
level.Warn(log).Log("msg", "too many requests", "err", err)
http.Error(w, fmt.Sprintf("too many requests: %s", err), http.StatusTooManyRequests)
return
}
level.Error(log).Log("msg", "failed to push metric data", "err", err)
http.Error(w, "failed to push metric data", http.StatusInternalServerError)
return
}
// Counting the request and number of samples after validation.
wp.recorder.measureReceivedRequest(userID)
wp.recorder.measureReceivedSamples(userID, len(series))
w.WriteHeader(http.StatusOK)
body, _ := json.Marshal(remoteWriteResponse{
Published: len(series),
})
_, _ = w.Write(body)
level.Debug(log).Log("msg", "successful series write", "len", len(series), "duration", time.Since(startTime))
}
func extractMetricsFromRequest(r *http.Request) ([]*schema.MetricData, error) {
var metrics []*schema.MetricData
var err error
contentType := strings.ToLower(r.Header.Get("Content-Type"))
switch contentType {
case contentTypeMetricBinary:
metrics, err = metricsBinary(r, false)
case contentTypeMetricBinarySnappy:
metrics, err = metricsBinary(r, true)
case contentTypeApplicationJSON:
metrics, err = metricsJSON(r)
default:
return nil, errorx.UnsupportedMediaType{Msg: fmt.Sprintf("unknown content-type %q", contentType)}
}
return metrics, err
}
func metricsJSON(r *http.Request) ([]*schema.MetricData, error) {
if r.Body == nil {
return nil, fmt.Errorf("no data included in request")
}
defer r.Body.Close()
body, err := io.ReadAll(r.Body)
if err != nil {
return nil, err
}
metrics := make([]*schema.MetricData, 0)
err = json.Unmarshal(body, &metrics)
if err != nil {
return nil, fmt.Errorf("invalid metric data received: %s", err)
}
return metrics, nil
}
func metricsBinary(r *http.Request, compressed bool) ([]*schema.MetricData, error) {
if r.Body == nil {
return nil, fmt.Errorf("no data included in request")
}
var bodyReadCloser io.ReadCloser
if compressed {
bodyReadCloser = io.NopCloser(snappy.NewReader(r.Body))
} else {
bodyReadCloser = r.Body
}
defer bodyReadCloser.Close()
body, err := io.ReadAll(bodyReadCloser)
if err != nil {
return nil, err
}
metricData := new(msg.MetricData)
err = metricData.InitFromMsg(body)
if err != nil {
return nil, fmt.Errorf("invalid metric data received: %s", err)
}
err = metricData.DecodeMetricData()
if err != nil {
return nil, fmt.Errorf("invalid metric data received:%s", err)
}
return metricData.Metrics, nil
}
// metricDataDefaults enforces orgID in the metric to be int(1) as we don't use it and some customers may not provide it,
// and makes sure that metric type is present, defaulting to "gauge" if not set
func metricDataDefaults(m *schema.MetricData) {
m.OrgId = 1
if m.Mtype == "" {
m.Mtype = "gauge"
}
}