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azuremonitor-datasource.go
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azuremonitor-datasource.go
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package azuremonitor
import (
"context"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"path"
"strings"
"time"
"github.com/grafana/grafana/pkg/api/pluginproxy"
"github.com/grafana/grafana/pkg/models"
"github.com/grafana/grafana/pkg/plugins"
"github.com/grafana/grafana/pkg/setting"
opentracing "github.com/opentracing/opentracing-go"
"golang.org/x/net/context/ctxhttp"
"github.com/grafana/grafana/pkg/components/null"
"github.com/grafana/grafana/pkg/components/simplejson"
"github.com/grafana/grafana/pkg/tsdb"
)
// AzureMonitorDatasource calls the Azure Monitor API - one of the four API's supported
type AzureMonitorDatasource struct {
httpClient *http.Client
dsInfo *models.DataSource
}
var (
// 1m, 5m, 15m, 30m, 1h, 6h, 12h, 1d in milliseconds
allowedIntervalsMS = []int64{60000, 300000, 900000, 1800000, 3600000, 21600000, 43200000, 86400000}
)
// executeTimeSeriesQuery does the following:
// 1. build the AzureMonitor url and querystring for each query
// 2. executes each query by calling the Azure Monitor API
// 3. parses the responses for each query into the timeseries format
func (e *AzureMonitorDatasource) executeTimeSeriesQuery(ctx context.Context, originalQueries []*tsdb.Query, timeRange *tsdb.TimeRange) (*tsdb.Response, error) {
result := &tsdb.Response{
Results: map[string]*tsdb.QueryResult{},
}
queries, err := e.buildQueries(originalQueries, timeRange)
if err != nil {
return nil, err
}
for _, query := range queries {
queryRes, resp, err := e.executeQuery(ctx, query, originalQueries, timeRange)
if err != nil {
return nil, err
}
// azlog.Debug("AzureMonitor", "Response", resp)
err = e.parseResponse(queryRes, resp, query)
if err != nil {
queryRes.Error = err
}
result.Results[query.RefID] = queryRes
}
return result, nil
}
func (e *AzureMonitorDatasource) buildQueries(queries []*tsdb.Query, timeRange *tsdb.TimeRange) ([]*AzureMonitorQuery, error) {
azureMonitorQueries := []*AzureMonitorQuery{}
startTime, err := timeRange.ParseFrom()
if err != nil {
return nil, err
}
endTime, err := timeRange.ParseTo()
if err != nil {
return nil, err
}
for _, query := range queries {
var target string
azureMonitorTarget := query.Model.Get("azureMonitor").MustMap()
azlog.Debug("AzureMonitor", "target", azureMonitorTarget)
urlComponents := map[string]string{}
urlComponents["resourceGroup"] = fmt.Sprintf("%v", azureMonitorTarget["resourceGroup"])
urlComponents["metricDefinition"] = fmt.Sprintf("%v", azureMonitorTarget["metricDefinition"])
urlComponents["resourceName"] = fmt.Sprintf("%v", azureMonitorTarget["resourceName"])
ub := urlBuilder{
ResourceGroup: urlComponents["resourceGroup"],
MetricDefinition: urlComponents["metricDefinition"],
ResourceName: urlComponents["resourceName"],
}
azureURL := ub.Build()
alias := fmt.Sprintf("%v", azureMonitorTarget["alias"])
timeGrain := fmt.Sprintf("%v", azureMonitorTarget["timeGrain"])
if timeGrain == "auto" {
autoInterval := e.findClosestAllowedIntervalMS(query.IntervalMs)
tg := &TimeGrain{}
timeGrain, err = tg.createISO8601DurationFromIntervalMS(autoInterval)
if err != nil {
return nil, err
}
}
params := url.Values{}
params.Add("api-version", "2018-01-01")
params.Add("timespan", fmt.Sprintf("%v/%v", startTime.UTC().Format(time.RFC3339), endTime.UTC().Format(time.RFC3339)))
params.Add("interval", timeGrain)
params.Add("aggregation", fmt.Sprintf("%v", azureMonitorTarget["aggregation"]))
params.Add("metricnames", fmt.Sprintf("%v", azureMonitorTarget["metricName"]))
dimension := strings.TrimSpace(fmt.Sprintf("%v", azureMonitorTarget["dimension"]))
dimensionFilter := strings.TrimSpace(fmt.Sprintf("%v", azureMonitorTarget["dimensionFilter"]))
if azureMonitorTarget["dimension"] != nil && azureMonitorTarget["dimensionFilter"] != nil && len(dimension) > 0 && len(dimensionFilter) > 0 {
params.Add("$filter", fmt.Sprintf("%s eq '%s'", dimension, dimensionFilter))
}
target = params.Encode()
if setting.Env == setting.DEV {
azlog.Debug("Azuremonitor request", "params", params)
}
azureMonitorQueries = append(azureMonitorQueries, &AzureMonitorQuery{
URL: azureURL,
UrlComponents: urlComponents,
Target: target,
Params: params,
RefID: query.RefId,
Alias: alias,
})
}
return azureMonitorQueries, nil
}
func (e *AzureMonitorDatasource) executeQuery(ctx context.Context, query *AzureMonitorQuery, queries []*tsdb.Query, timeRange *tsdb.TimeRange) (*tsdb.QueryResult, AzureMonitorResponse, error) {
queryResult := &tsdb.QueryResult{Meta: simplejson.New(), RefId: query.RefID}
req, err := e.createRequest(ctx, e.dsInfo)
if err != nil {
queryResult.Error = err
return queryResult, AzureMonitorResponse{}, nil
}
req.URL.Path = path.Join(req.URL.Path, query.URL)
req.URL.RawQuery = query.Params.Encode()
queryResult.Meta.Set("rawQuery", req.URL.RawQuery)
span, ctx := opentracing.StartSpanFromContext(ctx, "azuremonitor query")
span.SetTag("target", query.Target)
span.SetTag("from", timeRange.From)
span.SetTag("until", timeRange.To)
span.SetTag("datasource_id", e.dsInfo.Id)
span.SetTag("org_id", e.dsInfo.OrgId)
defer span.Finish()
opentracing.GlobalTracer().Inject(
span.Context(),
opentracing.HTTPHeaders,
opentracing.HTTPHeadersCarrier(req.Header))
azlog.Debug("AzureMonitor", "Request URL", req.URL.String())
res, err := ctxhttp.Do(ctx, e.httpClient, req)
if err != nil {
queryResult.Error = err
return queryResult, AzureMonitorResponse{}, nil
}
data, err := e.unmarshalResponse(res)
if err != nil {
queryResult.Error = err
return queryResult, AzureMonitorResponse{}, nil
}
return queryResult, data, nil
}
func (e *AzureMonitorDatasource) createRequest(ctx context.Context, dsInfo *models.DataSource) (*http.Request, error) {
// find plugin
plugin, ok := plugins.DataSources[dsInfo.Type]
if !ok {
return nil, errors.New("Unable to find datasource plugin Azure Monitor")
}
var azureMonitorRoute *plugins.AppPluginRoute
for _, route := range plugin.Routes {
if route.Path == "azuremonitor" {
azureMonitorRoute = route
break
}
}
cloudName := dsInfo.JsonData.Get("cloudName").MustString("azuremonitor")
subscriptionID := dsInfo.JsonData.Get("subscriptionId").MustString()
proxyPass := fmt.Sprintf("%s/subscriptions/%s", cloudName, subscriptionID)
u, _ := url.Parse(dsInfo.Url)
u.Path = path.Join(u.Path, "render")
req, err := http.NewRequest(http.MethodGet, u.String(), nil)
if err != nil {
azlog.Error("Failed to create request", "error", err)
return nil, fmt.Errorf("Failed to create request. error: %v", err)
}
req.Header.Set("Content-Type", "application/json")
req.Header.Set("User-Agent", fmt.Sprintf("Grafana/%s", setting.BuildVersion))
pluginproxy.ApplyRoute(ctx, req, proxyPass, azureMonitorRoute, dsInfo)
return req, nil
}
func (e *AzureMonitorDatasource) unmarshalResponse(res *http.Response) (AzureMonitorResponse, error) {
body, err := ioutil.ReadAll(res.Body)
defer res.Body.Close()
if err != nil {
return AzureMonitorResponse{}, err
}
if res.StatusCode/100 != 2 {
azlog.Error("Request failed", "status", res.Status, "body", string(body))
return AzureMonitorResponse{}, fmt.Errorf(string(body))
}
var data AzureMonitorResponse
err = json.Unmarshal(body, &data)
if err != nil {
azlog.Error("Failed to unmarshal AzureMonitor response", "error", err, "status", res.Status, "body", string(body))
return AzureMonitorResponse{}, err
}
return data, nil
}
func (e *AzureMonitorDatasource) parseResponse(queryRes *tsdb.QueryResult, data AzureMonitorResponse, query *AzureMonitorQuery) error {
if len(data.Value) == 0 {
return nil
}
for _, series := range data.Value[0].Timeseries {
points := []tsdb.TimePoint{}
metadataName := ""
metadataValue := ""
if len(series.Metadatavalues) > 0 {
metadataName = series.Metadatavalues[0].Name.LocalizedValue
metadataValue = series.Metadatavalues[0].Value
}
defaultMetricName := formatLegendKey(query.UrlComponents["resourceName"], data.Value[0].Name.LocalizedValue, metadataName, metadataValue)
for _, point := range series.Data {
var value float64
switch query.Params.Get("aggregation") {
case "Average":
value = point.Average
case "Total":
value = point.Total
case "Maximum":
value = point.Maximum
case "Minimum":
value = point.Minimum
case "Count":
value = point.Count
default:
value = point.Count
}
points = append(points, tsdb.NewTimePoint(null.FloatFrom(value), float64((point.TimeStamp).Unix())*1000))
}
queryRes.Series = append(queryRes.Series, &tsdb.TimeSeries{
Name: defaultMetricName,
Points: points,
})
}
return nil
}
// findClosestAllowedIntervalMs is used for the auto time grain setting.
// It finds the closest time grain from the list of allowed time grains for Azure Monitor
// using the Grafana interval in milliseconds
func (e *AzureMonitorDatasource) findClosestAllowedIntervalMS(intervalMs int64) int64 {
closest := allowedIntervalsMS[0]
for i, allowed := range allowedIntervalsMS {
if intervalMs > allowed {
if i+1 < len(allowedIntervalsMS) {
closest = allowedIntervalsMS[i+1]
} else {
closest = allowed
}
}
}
return closest
}
// formatLegendKey builds the legend key or timeseries name
func formatLegendKey(resourceName string, metricName string, metadataName string, metadataValue string) string {
if len(metadataName) > 0 {
return fmt.Sprintf("%s{%s=%s}.%s", resourceName, metadataName, metadataValue, metricName)
}
return fmt.Sprintf("%s.%s", resourceName, metricName)
}