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graphite.go
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graphite.go
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package graphite
import (
"context"
"encoding/json"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"path"
"regexp"
"strings"
"golang.org/x/net/context/ctxhttp"
"github.com/grafana/grafana/pkg/log"
"github.com/grafana/grafana/pkg/models"
"github.com/grafana/grafana/pkg/setting"
"github.com/grafana/grafana/pkg/tsdb"
"github.com/opentracing/opentracing-go"
)
type GraphiteExecutor struct {
HttpClient *http.Client
}
func NewGraphiteExecutor(datasource *models.DataSource) (tsdb.TsdbQueryEndpoint, error) {
return &GraphiteExecutor{}, nil
}
var glog = log.New("tsdb.graphite")
func init() {
tsdb.RegisterTsdbQueryEndpoint("graphite", NewGraphiteExecutor)
}
func (e *GraphiteExecutor) Query(ctx context.Context, dsInfo *models.DataSource, tsdbQuery *tsdb.TsdbQuery) (*tsdb.Response, error) {
result := &tsdb.Response{}
from := "-" + formatTimeRange(tsdbQuery.TimeRange.From)
until := formatTimeRange(tsdbQuery.TimeRange.To)
var target string
formData := url.Values{
"from": []string{from},
"until": []string{until},
"format": []string{"json"},
"maxDataPoints": []string{"500"},
}
for _, query := range tsdbQuery.Queries {
glog.Info("graphite", "query", query.Model)
if fullTarget, err := query.Model.Get("targetFull").String(); err == nil {
target = fixIntervalFormat(fullTarget)
} else {
target = fixIntervalFormat(query.Model.Get("target").MustString())
}
}
formData["target"] = []string{target}
if setting.Env == setting.DEV {
glog.Debug("Graphite request", "params", formData)
}
req, err := e.createRequest(dsInfo, formData)
if err != nil {
return nil, err
}
httpClient, err := dsInfo.GetHttpClient()
if err != nil {
return nil, err
}
span, ctx := opentracing.StartSpanFromContext(ctx, "graphite query")
span.SetTag("target", target)
span.SetTag("from", from)
span.SetTag("until", until)
span.SetTag("datasource_id", dsInfo.Id)
span.SetTag("org_id", dsInfo.OrgId)
defer span.Finish()
opentracing.GlobalTracer().Inject(
span.Context(),
opentracing.HTTPHeaders,
opentracing.HTTPHeadersCarrier(req.Header))
res, err := ctxhttp.Do(ctx, httpClient, req)
if err != nil {
return nil, err
}
data, err := e.parseResponse(res)
if err != nil {
return nil, err
}
result.Results = make(map[string]*tsdb.QueryResult)
queryRes := tsdb.NewQueryResult()
for _, series := range data {
queryRes.Series = append(queryRes.Series, &tsdb.TimeSeries{
Name: series.Target,
Points: series.DataPoints,
})
if setting.Env == setting.DEV {
glog.Debug("Graphite response", "target", series.Target, "datapoints", len(series.DataPoints))
}
}
result.Results["A"] = queryRes
return result, nil
}
func (e *GraphiteExecutor) parseResponse(res *http.Response) ([]TargetResponseDTO, error) {
body, err := ioutil.ReadAll(res.Body)
defer res.Body.Close()
if err != nil {
return nil, err
}
if res.StatusCode/100 != 2 {
glog.Info("Request failed", "status", res.Status, "body", string(body))
return nil, fmt.Errorf("Request failed status: %v", res.Status)
}
var data []TargetResponseDTO
err = json.Unmarshal(body, &data)
if err != nil {
glog.Info("Failed to unmarshal graphite response", "error", err, "status", res.Status, "body", string(body))
return nil, err
}
return data, nil
}
func (e *GraphiteExecutor) createRequest(dsInfo *models.DataSource, data url.Values) (*http.Request, error) {
u, _ := url.Parse(dsInfo.Url)
u.Path = path.Join(u.Path, "render")
req, err := http.NewRequest(http.MethodPost, u.String(), strings.NewReader(data.Encode()))
if err != nil {
glog.Info("Failed to create request", "error", err)
return nil, fmt.Errorf("Failed to create request. error: %v", err)
}
req.Header.Set("Content-Type", "application/x-www-form-urlencoded")
if dsInfo.BasicAuth {
req.SetBasicAuth(dsInfo.BasicAuthUser, dsInfo.BasicAuthPassword)
}
return req, err
}
func formatTimeRange(input string) string {
if input == "now" {
return input
}
return strings.Replace(strings.Replace(strings.Replace(input, "now", "", -1), "m", "min", -1), "M", "mon", -1)
}
func fixIntervalFormat(target string) string {
rMinute := regexp.MustCompile(`'(\d+)m'`)
rMin := regexp.MustCompile("m")
target = rMinute.ReplaceAllStringFunc(target, func(m string) string {
return rMin.ReplaceAllString(m, "min")
})
rMonth := regexp.MustCompile(`'(\d+)M'`)
rMon := regexp.MustCompile("M")
target = rMonth.ReplaceAllStringFunc(target, func(M string) string {
return rMon.ReplaceAllString(M, "mon")
})
return target
}