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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"
)
type GraphiteExecutor struct {
*models.DataSource
HttpClient *http.Client
}
func NewGraphiteExecutor(datasource *models.DataSource) (tsdb.Executor, error) {
httpClient, err := datasource.GetHttpClient()
if err != nil {
return nil, err
}
return &GraphiteExecutor{
DataSource: datasource,
HttpClient: httpClient,
}, nil
}
var (
glog log.Logger
)
func init() {
glog = log.New("tsdb.graphite")
tsdb.RegisterExecutor("graphite", NewGraphiteExecutor)
}
func (e *GraphiteExecutor) Execute(ctx context.Context, queries tsdb.QuerySlice, context *tsdb.QueryContext) *tsdb.BatchResult {
result := &tsdb.BatchResult{}
formData := url.Values{
"from": []string{"-" + formatTimeRange(context.TimeRange.From)},
"until": []string{formatTimeRange(context.TimeRange.To)},
"format": []string{"json"},
"maxDataPoints": []string{"500"},
}
for _, query := range queries {
if fullTarget, err := query.Model.Get("targetFull").String(); err == nil {
formData["target"] = []string{fixIntervalFormat(fullTarget)}
} else {
formData["target"] = []string{fixIntervalFormat(query.Model.Get("target").MustString())}
}
}
if setting.Env == setting.DEV {
glog.Debug("Graphite request", "params", formData)
}
req, err := e.createRequest(formData)
if err != nil {
result.Error = err
return result
}
res, err := ctxhttp.Do(ctx, e.HttpClient, req)
if err != nil {
result.Error = err
return result
}
data, err := e.parseResponse(res)
if err != nil {
result.Error = err
return result
}
result.QueryResults = 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.QueryResults["A"] = queryRes
return result
}
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(data url.Values) (*http.Request, error) {
u, _ := url.Parse(e.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 e.BasicAuth {
req.SetBasicAuth(e.BasicAuthUser, e.BasicAuthPassword)
}
return req, err
}
func formatTimeRange(input string) string {
if input == "now" {
return input
}
return strings.Replace(strings.Replace(input, "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
}