Merge branch 'utkarshcmu-alerting_opentsdb' into alerting_opentsdb

pkg/tsdb/opentsdb/opentsdb.go

@@ -2,9 +2,21 @@ package opentsdb
 
 import (
 	"context"
+	"fmt"
+	"path"
+	"strconv"
+	"strings"
+
+	"io/ioutil"
 	"net/http"
+	"net/url"
+	//"net/http/httputil"
+	"encoding/json"
+
+	"gopkg.in/guregu/null.v3"
 
 	"github.com/grafana/grafana/pkg/log"
+	"github.com/grafana/grafana/pkg/setting"
 	"github.com/grafana/grafana/pkg/tsdb"
 )
 
@@ -12,7 +24,7 @@ type OpenTsdbExecutor struct {
 	*tsdb.DataSourceInfo
 }
 
-func NewOpenTsdbExecutorExecutor(dsInfo *tsdb.DataSourceInfo) tsdb.Executor {
+func NewOpenTsdbExecutor(dsInfo *tsdb.DataSourceInfo) tsdb.Executor {
 	return &OpenTsdbExecutor{dsInfo}
 }
 
@@ -23,9 +35,118 @@ var (
 
 func init() {
 	plog = log.New("tsdb.opentsdb")
-	tsdb.RegisterExecutor("opentsdb", NewOpenTsdbExecutorExecutor)
+	tsdb.RegisterExecutor("opentsdb", NewOpenTsdbExecutor)
 }
 
 func (e *OpenTsdbExecutor) Execute(ctx context.Context, queries tsdb.QuerySlice, queryContext *tsdb.QueryContext) *tsdb.BatchResult {
-	panic("Missing implementation")
+	result := &tsdb.BatchResult{}
+
+	var tsdbQuery OpenTsdbQuery
+
+	tsdbQuery.Start = queryContext.TimeRange.GetFromAsMsEpoch()
+	tsdbQuery.End = queryContext.TimeRange.GetToAsMsEpoch()
+
+	for _, query := range queries {
+		tsdbQuery.Queries = []OpenTsdbMetric{
+			OpenTsdbMetric{
+				Metric:     query.Model.Get("metric").MustString(),
+				Aggregator: query.Model.Get("aggregator").MustString(),
+			},
+		}
+	}
+
+	if setting.Env == setting.DEV {
+		plog.Debug("OpenTsdb request", "params", tsdbQuery)
+	}
+
+	req, err := e.createRequest(tsdbQuery)
+	if err != nil {
+		result.Error = err
+		return result
+	}
+
+	res, err := HttpClient.Do(req)
+	if err != nil {
+		result.Error = err
+		return result
+	}
+
+	queryResult, err := e.parseResponse(tsdbQuery, res)
+	if err != nil {
+		return result.WithError(err)
+	}
+
+	result.QueryResults = queryResult
+	return result
+}
+
+func (e *OpenTsdbExecutor) createRequest(data OpenTsdbQuery) (*http.Request, error) {
+	u, _ := url.Parse(e.Url)
+	u.Path = path.Join(u.Path, "api/query")
+
+	postData, err := json.Marshal(data)
+
+	req, err := http.NewRequest(http.MethodPost, u.String(), strings.NewReader(string(postData)))
+	if err != nil {
+		plog.Info("Failed to create request", "error", err)
+		return nil, fmt.Errorf("Failed to create request. error: %v", err)
+	}
+
+	req.Header.Set("Content-Type", "application/json")
+	if e.BasicAuth {
+		req.SetBasicAuth(e.BasicAuthUser, e.BasicAuthPassword)
+	}
+
+	/*
+	  requestDump, err := httputil.DumpRequest(req, true)
+	  if err != nil {
+	    fmt.Println(err)
+	  }
+	  fmt.Println(string(requestDump))
+	*/
+	return req, err
+}
+
+func (e *OpenTsdbExecutor) parseResponse(query OpenTsdbQuery, res *http.Response) (map[string]*tsdb.QueryResult, error) {
+
+	queryResults := make(map[string]*tsdb.QueryResult)
+	queryRes := tsdb.NewQueryResult()
+
+	body, err := ioutil.ReadAll(res.Body)
+	defer res.Body.Close()
+	if err != nil {
+		return nil, err
+	}
+
+	if res.StatusCode/100 != 2 {
+		plog.Info("Request failed", "status", res.Status, "body", string(body))
+		return nil, fmt.Errorf("Request failed status: %v", res.Status)
+	}
+
+	var data []OpenTsdbResponse
+	err = json.Unmarshal(body, &data)
+	if err != nil {
+		plog.Info("Failed to unmarshal opentsdb response", "error", err, "status", res.Status, "body", string(body))
+		return nil, err
+	}
+
+	for _, val := range data {
+		series := tsdb.TimeSeries{
+			Name: val.Metric,
+		}
+
+		for timeString, value := range val.DataPoints {
+			timestamp, err := strconv.ParseFloat(timeString, 64)
+			if err != nil {
+				plog.Info("Failed to unmarshal opentsdb timestamp", "timestamp", timeString)
+				return nil, err
+			}
+			series.Points = append(series.Points, tsdb.NewTimePoint(null.FloatFrom(value), timestamp))
+		}
+
+		queryRes.Series = append(queryRes.Series, &series)
+	}
+
+	queryResults["A"] = queryRes
+	return queryResults, nil
 }

pkg/tsdb/opentsdb/types.go

@@ -0,0 +1,17 @@
+package opentsdb
+
+type OpenTsdbQuery struct {
+	Start	   int64     				 `json:"start"`
+	End		   int64   	 				 `json:"end"`
+	Queries  []OpenTsdbMetric  `json:"queries"`
+}
+
+type OpenTsdbMetric struct {
+	Metric      string  `json:"metric"`
+	Aggregator  string  `json:"aggregator"`
+}
+
+type OpenTsdbResponse struct {
+  Metric     string              `json:"metric"`
+  DataPoints map[string]float64  `json:"dps"`
+}