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graphite.go
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graphite.go
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package graphite
import (
"context"
"encoding/json"
"errors"
"fmt"
"io"
"net/http"
"net/url"
"path"
"regexp"
"strconv"
"strings"
"time"
"github.com/grafana/grafana-plugin-sdk-go/backend"
"github.com/grafana/grafana-plugin-sdk-go/backend/datasource"
"github.com/grafana/grafana-plugin-sdk-go/backend/instancemgmt"
"github.com/grafana/grafana-plugin-sdk-go/data"
"go.opentelemetry.io/otel/attribute"
"go.opentelemetry.io/otel/codes"
"github.com/grafana/grafana/pkg/components/simplejson"
"github.com/grafana/grafana/pkg/infra/httpclient"
"github.com/grafana/grafana/pkg/infra/log"
"github.com/grafana/grafana/pkg/infra/tracing"
"github.com/grafana/grafana/pkg/setting"
"github.com/grafana/grafana/pkg/tsdb/legacydata"
)
type Service struct {
logger log.Logger
im instancemgmt.InstanceManager
tracer tracing.Tracer
}
const (
TargetFullModelField = "targetFull"
TargetModelField = "target"
)
func ProvideService(httpClientProvider httpclient.Provider, tracer tracing.Tracer) *Service {
return &Service{
logger: log.New("tsdb.graphite"),
im: datasource.NewInstanceManager(newInstanceSettings(httpClientProvider)),
tracer: tracer,
}
}
type datasourceInfo struct {
HTTPClient *http.Client
URL string
Id int64
}
func newInstanceSettings(httpClientProvider httpclient.Provider) datasource.InstanceFactoryFunc {
return func(settings backend.DataSourceInstanceSettings) (instancemgmt.Instance, error) {
opts, err := settings.HTTPClientOptions()
if err != nil {
return nil, err
}
client, err := httpClientProvider.New(opts)
if err != nil {
return nil, err
}
model := datasourceInfo{
HTTPClient: client,
URL: settings.URL,
Id: settings.ID,
}
return model, nil
}
}
func (s *Service) getDSInfo(pluginCtx backend.PluginContext) (*datasourceInfo, error) {
i, err := s.im.Get(pluginCtx)
if err != nil {
return nil, err
}
instance := i.(datasourceInfo)
return &instance, nil
}
func (s *Service) QueryData(ctx context.Context, req *backend.QueryDataRequest) (*backend.QueryDataResponse, error) {
if len(req.Queries) == 0 {
return nil, fmt.Errorf("query contains no queries")
}
// get datasource info from context
dsInfo, err := s.getDSInfo(req.PluginContext)
if err != nil {
return nil, err
}
// take the first query in the request list, since all query should share the same timerange
q := req.Queries[0]
/*
graphite doc about from and until, with sdk we are getting absolute instead of relative time
https://graphite-api.readthedocs.io/en/latest/api.html#from-until
*/
from, until := epochMStoGraphiteTime(q.TimeRange)
formData := url.Values{
"from": []string{from},
"until": []string{until},
"format": []string{"json"},
"maxDataPoints": []string{"500"},
}
// Calculate and get the last target of Graphite Request
var target string
emptyQueries := make([]string, 0)
for _, query := range req.Queries {
model, err := simplejson.NewJson(query.JSON)
if err != nil {
return nil, err
}
s.logger.Debug("graphite", "query", model)
currTarget := ""
if fullTarget, err := model.Get(TargetFullModelField).String(); err == nil {
currTarget = fullTarget
} else {
currTarget = model.Get(TargetModelField).MustString()
}
if currTarget == "" {
s.logger.Debug("graphite", "empty query target", model)
emptyQueries = append(emptyQueries, fmt.Sprintf("Query: %v has no target", model))
continue
}
target = fixIntervalFormat(currTarget)
}
var result = backend.QueryDataResponse{}
if target == "" {
s.logger.Error("No targets in query model", "models without targets", strings.Join(emptyQueries, "\n"))
return &result, errors.New("no query target found for the alert rule")
}
formData["target"] = []string{target}
if setting.Env == setting.Dev {
s.logger.Debug("Graphite request", "params", formData)
}
graphiteReq, err := s.createRequest(ctx, dsInfo, formData)
if err != nil {
return &result, err
}
ctx, span := s.tracer.Start(ctx, "graphite query")
defer span.End()
span.SetAttributes("target", target, attribute.Key("target").String(target))
span.SetAttributes("from", from, attribute.Key("from").String(from))
span.SetAttributes("until", until, attribute.Key("until").String(until))
span.SetAttributes("datasource_id", dsInfo.Id, attribute.Key("datasource_id").Int64(dsInfo.Id))
span.SetAttributes("org_id", req.PluginContext.OrgID, attribute.Key("org_id").Int64(req.PluginContext.OrgID))
s.tracer.Inject(ctx, graphiteReq.Header, span)
res, err := dsInfo.HTTPClient.Do(graphiteReq)
if res != nil {
span.SetAttributes("graphite.response.code", res.StatusCode, attribute.Key("graphite.response.code").Int(res.StatusCode))
}
if err != nil {
span.RecordError(err)
span.SetStatus(codes.Error, err.Error())
return &result, err
}
frames, err := s.toDataFrames(res)
if err != nil {
span.RecordError(err)
span.SetStatus(codes.Error, err.Error())
return &result, err
}
result = backend.QueryDataResponse{
Responses: make(backend.Responses),
}
result.Responses["A"] = backend.DataResponse{
Frames: frames,
}
return &result, nil
}
func (s *Service) parseResponse(res *http.Response) ([]TargetResponseDTO, error) {
body, err := io.ReadAll(res.Body)
if err != nil {
return nil, err
}
defer func() {
if err := res.Body.Close(); err != nil {
s.logger.Warn("Failed to close response body", "err", err)
}
}()
if res.StatusCode/100 != 2 {
s.logger.Info("Request failed", "status", res.Status, "body", string(body))
return nil, fmt.Errorf("request failed, status: %s", res.Status)
}
var data []TargetResponseDTO
err = json.Unmarshal(body, &data)
if err != nil {
s.logger.Info("Failed to unmarshal graphite response", "error", err, "status", res.Status, "body", string(body))
return nil, err
}
return data, nil
}
func (s *Service) toDataFrames(response *http.Response) (frames data.Frames, error error) {
responseData, err := s.parseResponse(response)
if err != nil {
return nil, err
}
frames = data.Frames{}
for _, series := range responseData {
timeVector := make([]time.Time, 0, len(series.DataPoints))
values := make([]*float64, 0, len(series.DataPoints))
name := series.Target
for _, dataPoint := range series.DataPoints {
var timestamp, value, err = parseDataTimePoint(dataPoint)
if err != nil {
return nil, err
}
timeVector = append(timeVector, timestamp)
values = append(values, value)
}
tags := make(map[string]string)
for name, value := range series.Tags {
switch value := value.(type) {
case string:
tags[name] = value
case float64:
tags[name] = strconv.FormatFloat(value, 'f', -1, 64)
}
}
frames = append(frames, data.NewFrame(name,
data.NewField("time", nil, timeVector),
data.NewField("value", tags, values).SetConfig(&data.FieldConfig{DisplayNameFromDS: name})))
if setting.Env == setting.Dev {
s.logger.Debug("Graphite response", "target", series.Target, "datapoints", len(series.DataPoints))
}
}
return frames, nil
}
func (s *Service) createRequest(ctx context.Context, dsInfo *datasourceInfo, data url.Values) (*http.Request, error) {
u, err := url.Parse(dsInfo.URL)
if err != nil {
return nil, err
}
u.Path = path.Join(u.Path, "render")
req, err := http.NewRequestWithContext(ctx, http.MethodPost, u.String(), strings.NewReader(data.Encode()))
if err != nil {
s.logger.Info("Failed to create request", "error", err)
return nil, fmt.Errorf("failed to create request: %w", err)
}
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
return req, err
}
func fixIntervalFormat(target string) string {
rMinute := regexp.MustCompile(`'(\d+)m'`)
target = rMinute.ReplaceAllStringFunc(target, func(m string) string {
return strings.ReplaceAll(m, "m", "min")
})
rMonth := regexp.MustCompile(`'(\d+)M'`)
target = rMonth.ReplaceAllStringFunc(target, func(M string) string {
return strings.ReplaceAll(M, "M", "mon")
})
return target
}
func epochMStoGraphiteTime(tr backend.TimeRange) (string, string) {
return fmt.Sprintf("%d", tr.From.UTC().Unix()), fmt.Sprintf("%d", tr.To.UTC().Unix())
}
/**
* Graphite should always return timestamp as a number but values might be nil when data is missing
*/
func parseDataTimePoint(dataTimePoint legacydata.DataTimePoint) (time.Time, *float64, error) {
if !dataTimePoint[1].Valid {
return time.Time{}, nil, errors.New("failed to parse data point timestamp")
}
timestamp := time.Unix(int64(dataTimePoint[1].Float64), 0).UTC()
if dataTimePoint[0].Valid {
var value = new(float64)
*value = dataTimePoint[0].Float64
return timestamp, value, nil
} else {
return timestamp, nil, nil
}
}